diff --git a/data/static-nodes.json b/data/static-nodes.json
index 53c88ee1d..ac894964d 100644
--- a/data/static-nodes.json
+++ b/data/static-nodes.json
@@ -1,7 +1,5 @@
 [
-  "enode://e15869ba08a25e49be7568b951e15af5d77a472c8e4104a14a4951f99936d65f91240d5b5f23674aee44f1ac09d8adfc6a9bff75cd8c2df73a26442f313f2da4@162.243.63.248:30303",
-  "enode://efe4e6899e05237180c0970aedb81cb5aecf5b200779c7c9e1f955783e8299b364c0b981c03f4c36ad5328ef972b417afde260bbf2c5a8db37ba7f5738033952@198.199.105.122:30303",
-  "enode://5a5839435f48d1e3f2f907e4582f0a134e0b7857afe507073978ca32cf09ea54989dac433605047d0bc4cd19a8c80affac6876069014283aa7c7bb4954d0e623@95.85.40.211:30303",
-  "enode://2f05d430b4cb1c0e2a0772d48da3a034f1b596ea7163ab80d3404802d10b7d55bde323897c2be0d36026181e1a68510ea1f42a646ef9494c27e61f61e4088b7d@188.166.229.119:30303",
-  "enode://ad61a21f83f12b0ca494611650f5e4b6427784e7c62514dcb729a3d65106de6f12836813acf39bdc35c12ecfd0e230723678109fd4e7091ce389697bd7da39b4@139.59.212.114:30303"
+  "enode://fc3065bb80bfced98a01441718e2b70a0353f023b9da3d57beb8f96a827402d23702b3a461e1c1b6c7a208cb09cc0aea9b7c42bf953bb8f732529c198b158db4@95.85.40.211:30303",
+  "enode://5ffa3a39f95614d881e07d24e265865218c45fe73b3a5f5d05868190e385cbf60d03ac8beaa4c31b7ee84a0ec947f22c969e2dd1783041a4d7381f7774c74526@188.166.229.119:30303",
+  "enode://3b020a1fd6ab980a5670975e8a7361af1732fa3fa1819b751a94b6a4265e8c52b02c608c0de1347784b834b298280b018bcf6547f47bbba63612cba0e4707ec1@139.59.212.114:30303"
 ]
diff --git a/geth/node.go b/geth/node.go
index 3a0dfca01..b939a44dd 100644
--- a/geth/node.go
+++ b/geth/node.go
@@ -61,15 +61,15 @@ type SelectedExtKey struct {
 }
 
 type NodeManager struct {
-	currentNode        *node.Node                // currently running geth node
-	ctx                *cli.Context              // the CLI context used to start the geth node
-	lightEthereum      *les.LightEthereum        // LES service
-	accountManager     *accounts.Manager         // the account manager attached to the currentNode
-	jailedRequestQueue *JailedRequestQueue       // bridge via which jail notifies node of incoming requests
-	SelectedAccount    *SelectedExtKey           // account that was processed during the last call to SelectAccount()
-	whisperService     *whisper.Whisper          // Whisper service
-	client             *rpc.ClientRestartWrapper // RPC client
-	nodeStarted        chan struct{}             // channel to wait for node to start
+	currentNode        *node.Node          // currently running geth node
+	ctx                *cli.Context        // the CLI context used to start the geth node
+	lightEthereum      *les.LightEthereum  // LES service
+	accountManager     *accounts.Manager   // the account manager attached to the currentNode
+	jailedRequestQueue *JailedRequestQueue // bridge via which jail notifies node of incoming requests
+	SelectedAccount    *SelectedExtKey     // account that was processed during the last call to SelectAccount()
+	whisperService     *whisper.Whisper    // Whisper service
+	client             *rpc.Client         // RPC client
+	nodeStarted        chan struct{}       // channel to wait for node to start
 }
 
 var (
@@ -166,13 +166,11 @@ func (m *NodeManager) RunNode() {
 		m.lightEthereum.StatusBackend.SetTransactionQueueHandler(onSendTransactionRequest)
 		m.lightEthereum.StatusBackend.SetAccountsFilterHandler(onAccountsListRequest)
 
-		m.client = rpc.NewClientRestartWrapper(func() *rpc.Client {
-			client, err := m.currentNode.Attach()
-			if err != nil {
-				return nil
-			}
-			return client
-		})
+		var err error
+		m.client, err = m.currentNode.Attach()
+		if err != nil {
+			glog.V(logger.Warn).Infoln("cannot get RPC client service:", ErrInvalidClient)
+		}
 
 		// @TODO Remove after LES supports discover out of box
 		m.populateStaticPeers()
@@ -268,16 +266,16 @@ func (m *NodeManager) LightEthereumService() (*les.LightEthereum, error) {
 	return m.lightEthereum, nil
 }
 
-func (m *NodeManager) HasClientRestartWrapper() bool {
+func (m *NodeManager) HasRPCClient() bool {
 	return m.client != nil
 }
 
-func (m *NodeManager) ClientRestartWrapper() (*rpc.ClientRestartWrapper, error) {
+func (m *NodeManager) RPCClient() (*rpc.Client, error) {
 	if m == nil || !m.HasNode() {
 		return nil, ErrInvalidGethNode
 	}
 
-	if !m.HasClientRestartWrapper() {
+	if !m.HasRPCClient() {
 		return nil, ErrInvalidClient
 	}
 
diff --git a/geth/utils.go b/geth/utils.go
index 77d416f3c..935912a4d 100644
--- a/geth/utils.go
+++ b/geth/utils.go
@@ -23,7 +23,7 @@ var muPrepareTestNode sync.Mutex
 
 const (
 	TestDataDir         = "../.ethereumtest"
-	TestNodeSyncSeconds = 480
+	TestNodeSyncSeconds = 60
 )
 
 type NodeNotificationHandler func(jsonEvent string)
@@ -119,7 +119,7 @@ func PrepareTestNode() (err error) {
 	if !manager.HasNode() {
 		panic(ErrInvalidGethNode)
 	}
-	if !manager.HasClientRestartWrapper() {
+	if !manager.HasRPCClient() {
 		panic(ErrInvalidGethNode)
 	}
 	if !manager.HasWhisperService() {
diff --git a/jail/jail.go b/jail/jail.go
index 64174e1c5..dcc02efff 100644
--- a/jail/jail.go
+++ b/jail/jail.go
@@ -25,7 +25,7 @@ var (
 
 type Jail struct {
 	sync.RWMutex
-	client       *rpc.ClientRestartWrapper // lazy inited on the first call to jail.ClientRestartWrapper()
+	client       *rpc.Client               // lazy inited on the first call
 	cells        map[string]*JailedRuntime // jail supports running many isolated instances of jailed runtime
 	statusJS     string
 	requestQueue *geth.JailedRequestQueue
@@ -108,7 +108,7 @@ func (jail *Jail) Parse(chatId string, js string) string {
 }
 
 func (jail *Jail) Call(chatId string, path string, args string) string {
-	_, err := jail.ClientRestartWrapper()
+	_, err := jail.RPCClient()
 	if err != nil {
 		return printError(err.Error())
 	}
@@ -145,7 +145,7 @@ func (jail *Jail) GetVM(chatId string) (*otto.Otto, error) {
 
 // Send will serialize the first argument, send it to the node and returns the response.
 func (jail *Jail) Send(chatId string, call otto.FunctionCall) (response otto.Value) {
-	clientFactory, err := jail.ClientRestartWrapper()
+	client, err := jail.RPCClient()
 	if err != nil {
 		return newErrorResponse(call, -32603, err.Error(), nil)
 	}
@@ -201,7 +201,6 @@ func (jail *Jail) Send(chatId string, call otto.FunctionCall) (response otto.Val
 			return newErrorResponse(call, -32603, err.Error(), nil)
 		}
 
-		client := clientFactory.Client()
 		errc := make(chan error, 1)
 		errc2 := make(chan error)
 		go func() {
@@ -252,7 +251,7 @@ func (jail *Jail) Send(chatId string, call otto.FunctionCall) (response otto.Val
 	return response
 }
 
-func (jail *Jail) ClientRestartWrapper() (*rpc.ClientRestartWrapper, error) {
+func (jail *Jail) RPCClient() (*rpc.Client, error) {
 	if jail == nil {
 		return nil, ErrInvalidJail
 	}
@@ -267,7 +266,7 @@ func (jail *Jail) ClientRestartWrapper() (*rpc.ClientRestartWrapper, error) {
 	}
 
 	// obtain RPC client from running node
-	client, err := nodeManager.ClientRestartWrapper()
+	client, err := nodeManager.RPCClient()
 	if err != nil {
 		return nil, err
 	}
diff --git a/jail/jail_test.go b/jail/jail_test.go
index 6510863a8..9c27a4dbc 100644
--- a/jail/jail_test.go
+++ b/jail/jail_test.go
@@ -47,7 +47,7 @@ func TestJailUnInited(t *testing.T) {
 		t.Errorf("error expected, but got: %v", err)
 	}
 
-	_, err = jailInstance.ClientRestartWrapper()
+	_, err = jailInstance.RPCClient()
 	if err != jail.ErrInvalidJail {
 		t.Errorf("error expected, but got: %v", err)
 	}
diff --git a/vendor/github.com/ethereum/go-ethereum/cmd/bootnode/main.go b/vendor/github.com/ethereum/go-ethereum/cmd/bootnode/main.go
index 40d3cdc17..a6c5dfe4e 100644
--- a/vendor/github.com/ethereum/go-ethereum/cmd/bootnode/main.go
+++ b/vendor/github.com/ethereum/go-ethereum/cmd/bootnode/main.go
@@ -27,6 +27,7 @@ import (
 	"github.com/ethereum/go-ethereum/crypto"
 	"github.com/ethereum/go-ethereum/logger/glog"
 	"github.com/ethereum/go-ethereum/p2p/discover"
+	"github.com/ethereum/go-ethereum/p2p/discv5"
 	"github.com/ethereum/go-ethereum/p2p/nat"
 )
 
@@ -38,6 +39,8 @@ func main() {
 		nodeKeyFile = flag.String("nodekey", "", "private key filename")
 		nodeKeyHex  = flag.String("nodekeyhex", "", "private key as hex (for testing)")
 		natdesc     = flag.String("nat", "none", "port mapping mechanism (any|none|upnp|pmp|extip:<IP>)")
+		runv5       = flag.Bool("v5", false, "run a v5 topic discovery bootnode")
+		v5test      = flag.Bool("v5test", false, "run a v5 topic discovery test node (adds default bootnodes to form a test network)")
 
 		nodeKey *ecdsa.PrivateKey
 		err     error
@@ -79,8 +82,21 @@ func main() {
 		os.Exit(0)
 	}
 
-	if _, err := discover.ListenUDP(nodeKey, *listenAddr, natm, ""); err != nil {
-		utils.Fatalf("%v", err)
+	if *runv5 || *v5test {
+		if ntab, err := discv5.ListenUDP(nodeKey, *listenAddr, natm, ""); err != nil {
+			utils.Fatalf("%v", err)
+		} else {
+			if *v5test {
+				if err := ntab.SetFallbackNodes(discv5.BootNodes); err != nil {
+					utils.Fatalf("%v", err)
+				}
+			}
+		}
+	} else {
+		if _, err := discover.ListenUDP(nodeKey, *listenAddr, natm, ""); err != nil {
+			utils.Fatalf("%v", err)
+		}
 	}
+
 	select {}
 }
diff --git a/vendor/github.com/ethereum/go-ethereum/cmd/evm/main.go b/vendor/github.com/ethereum/go-ethereum/cmd/evm/main.go
index 22707c1cc..9ca761b7b 100644
--- a/vendor/github.com/ethereum/go-ethereum/cmd/evm/main.go
+++ b/vendor/github.com/ethereum/go-ethereum/cmd/evm/main.go
@@ -33,6 +33,7 @@ import (
 	"github.com/ethereum/go-ethereum/crypto"
 	"github.com/ethereum/go-ethereum/ethdb"
 	"github.com/ethereum/go-ethereum/logger/glog"
+	"github.com/ethereum/go-ethereum/params"
 	"gopkg.in/urfave/cli.v1"
 )
 
@@ -226,6 +227,9 @@ func NewEnv(state *state.StateDB, transactor common.Address, value *big.Int, cfg
 type ruleSet struct{}
 
 func (ruleSet) IsHomestead(*big.Int) bool { return true }
+func (ruleSet) GasTable(*big.Int) params.GasTable {
+	return params.GasTableHomesteadGasRepriceFork
+}
 
 func (self *VMEnv) RuleSet() vm.RuleSet       { return ruleSet{} }
 func (self *VMEnv) Vm() vm.Vm                 { return self.evm }
diff --git a/vendor/github.com/ethereum/go-ethereum/cmd/geth/chaincmd.go b/vendor/github.com/ethereum/go-ethereum/cmd/geth/chaincmd.go
index 01fce7d1a..153e3ddbd 100644
--- a/vendor/github.com/ethereum/go-ethereum/cmd/geth/chaincmd.go
+++ b/vendor/github.com/ethereum/go-ethereum/cmd/geth/chaincmd.go
@@ -31,6 +31,7 @@ import (
 	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/ethdb"
 	"github.com/ethereum/go-ethereum/logger/glog"
+	"github.com/syndtr/goleveldb/leveldb/util"
 	"gopkg.in/urfave/cli.v1"
 )
 
@@ -81,13 +82,29 @@ func importChain(ctx *cli.Context) error {
 	}
 	stack := makeFullNode(ctx)
 	chain, chainDb := utils.MakeChain(ctx, stack)
+	defer chainDb.Close()
+
+	// Import the chain
 	start := time.Now()
-	err := utils.ImportChain(chain, ctx.Args().First())
-	chainDb.Close()
-	if err != nil {
+	if err := utils.ImportChain(chain, ctx.Args().First()); err != nil {
 		utils.Fatalf("Import error: %v", err)
 	}
-	fmt.Printf("Import done in %v", time.Since(start))
+	fmt.Printf("Import done in %v, compacting...\n", time.Since(start))
+
+	// Compact the entire database to more accurately measure disk io and print the stats
+	if db, ok := chainDb.(*ethdb.LDBDatabase); ok {
+		start = time.Now()
+		if err := db.LDB().CompactRange(util.Range{}); err != nil {
+			utils.Fatalf("Compaction failed: %v", err)
+		}
+		fmt.Printf("Compaction done in %v.\n", time.Since(start))
+
+		stats, err := db.LDB().GetProperty("leveldb.stats")
+		if err != nil {
+			utils.Fatalf("Failed to read database stats: %v", err)
+		}
+		fmt.Println(stats)
+	}
 	return nil
 }
 
diff --git a/vendor/github.com/ethereum/go-ethereum/cmd/geth/consolecmd.go b/vendor/github.com/ethereum/go-ethereum/cmd/geth/consolecmd.go
index 703ad04db..066247303 100644
--- a/vendor/github.com/ethereum/go-ethereum/cmd/geth/consolecmd.go
+++ b/vendor/github.com/ethereum/go-ethereum/cmd/geth/consolecmd.go
@@ -70,13 +70,10 @@ func localConsole(ctx *cli.Context) error {
 	defer node.Stop()
 
 	// Attach to the newly started node and start the JavaScript console
-	client := rpc.NewClientRestartWrapper(func() *rpc.Client {
-		client, err := node.Attach()
-		if err != nil {
-			utils.Fatalf("Failed to attach to the inproc geth: %v", err)
-		}
-		return client
-	})
+	client, err := node.Attach()
+	if err != nil {
+		utils.Fatalf("Failed to attach to the inproc geth: %v", err)
+	}
 	config := console.Config{
 		DataDir: node.DataDir(),
 		DocRoot: ctx.GlobalString(utils.JSpathFlag.Name),
@@ -105,14 +102,10 @@ func localConsole(ctx *cli.Context) error {
 // console to it.
 func remoteConsole(ctx *cli.Context) error {
 	// Attach to a remotely running geth instance and start the JavaScript console
-	client := rpc.NewClientRestartWrapper(func() *rpc.Client {
-		client, err := dialRPC(ctx.Args().First())
-		if err != nil {
-			utils.Fatalf("Unable to attach to remote geth: %v", err)
-		}
-		return client
-	})
-
+	client, err := dialRPC(ctx.Args().First())
+	if err != nil {
+		utils.Fatalf("Unable to attach to remote geth: %v", err)
+	}
 	config := console.Config{
 		DataDir: utils.MakeDataDir(ctx),
 		DocRoot: ctx.GlobalString(utils.JSpathFlag.Name),
@@ -161,14 +154,10 @@ func ephemeralConsole(ctx *cli.Context) error {
 	defer node.Stop()
 
 	// Attach to the newly started node and start the JavaScript console
-	client := rpc.NewClientRestartWrapper(func() *rpc.Client {
-		client, err := node.Attach()
-		if err != nil {
-			utils.Fatalf("Failed to attach to the inproc geth: %v", err)
-		}
-		return client
-	})
-
+	client, err := node.Attach()
+	if err != nil {
+		utils.Fatalf("Failed to attach to the inproc geth: %v", err)
+	}
 	config := console.Config{
 		DataDir: node.DataDir(),
 		DocRoot: ctx.GlobalString(utils.JSpathFlag.Name),
diff --git a/vendor/github.com/ethereum/go-ethereum/cmd/geth/main.go b/vendor/github.com/ethereum/go-ethereum/cmd/geth/main.go
index 724a55d27..2ee2a1d26 100644
--- a/vendor/github.com/ethereum/go-ethereum/cmd/geth/main.go
+++ b/vendor/github.com/ethereum/go-ethereum/cmd/geth/main.go
@@ -143,6 +143,7 @@ participating.
 		utils.LightKDFFlag,
 		utils.JSpathFlag,
 		utils.ListenPortFlag,
+		utils.ListenPortV5Flag,
 		utils.MaxPeersFlag,
 		utils.MaxPendingPeersFlag,
 		utils.EtherbaseFlag,
@@ -157,6 +158,7 @@ participating.
 		utils.NATFlag,
 		utils.NatspecEnabledFlag,
 		utils.NoDiscoverFlag,
+		utils.DiscoveryV5Flag,
 		utils.NoEthFlag,
 		utils.NodeKeyFileFlag,
 		utils.NodeKeyHexFlag,
@@ -313,16 +315,14 @@ func startNode(ctx *cli.Context, stack *node.Node) {
 
 		if ctx.GlobalBool(utils.TestNetFlag.Name) {
 			// TestNet (John Gerryts @phonikg)
-			addPeer("enode://7d00e8c27b2328e2008a9fc86e81afba22681fdac675b99805fa62cc29ee8a2a9d83f916f7661da6a6bd78155a430bb2bd7cec733ca9e700e236ec9c71d97e24@50.112.52.169:30301")
+			addPeer("enode://6807cacb2b43b39d19162254c189b8828c008bb6539d39d832e98d3c65aeb70e10ce2698772b07e704b21ce7a6a4407ad0e15951ebb63b452f878cd366a1c3f5@50.112.52.169:30301")
 		} else {
 			if ctx.GlobalBool(utils.OpposeDAOFork.Name) {
-				// Classic (Azure)
-				addPeer("enode://fc3d7b57e5d317946bf421411632ec98d5ffcbf94548cd7bc10088e4fef176670f8ec70280d301a9d0b22fe498203f62b323da15b3acc18b02a1fee2a06b7d3f@40.118.3.223:30305")
 			} else {
 				// MainNet (Azure)
-				addPeer("enode://feaf206a308a669a789be45f4dadcb351246051727f12415ad69e44f8080daf0569c10fe1d9944d245dd1f3e1c89cedda8ce03d7e3d5ed8975a35cad4b4f7ec1@40.118.3.223:30303")
+				addPeer("enode://97d280903aff3db6049b5d5f8a5fb2c7ea9228b4352eeaa0ee919772b20009a22d1801ec4365f25c60d2f2dc9c35c6017a1d5a654e027f066ee765be4ecc5019@40.118.3.223:30303")
 				// MainNet (John Gerryts @phonikg)
-				addPeer("enode://3cbd26f73513af0e789c55ea9efa6d259be2d5f6882bdb52740e21e01379287b652642a87207f1bc07c64aae3ab51ab566dede7588d6064022d40577fe59d5de@50.112.52.169:30300")
+				addPeer("enode://08cc6631556d7ef632de642c0bcbbb0f9dc457155ecf1b5b92ba28baff076cd6cbfdd9e0524584fde021c691a508f133c3d019d5caad502b39944fc6ba5ce02f@50.112.52.169:30300")
 			}
 		}
 	}
diff --git a/vendor/github.com/ethereum/go-ethereum/cmd/geth/usage.go b/vendor/github.com/ethereum/go-ethereum/cmd/geth/usage.go
index 5a730681d..14ea2a2b0 100644
--- a/vendor/github.com/ethereum/go-ethereum/cmd/geth/usage.go
+++ b/vendor/github.com/ethereum/go-ethereum/cmd/geth/usage.go
@@ -113,10 +113,12 @@ var AppHelpFlagGroups = []flagGroup{
 		Flags: []cli.Flag{
 			utils.BootnodesFlag,
 			utils.ListenPortFlag,
+			utils.ListenPortV5Flag,
 			utils.MaxPeersFlag,
 			utils.MaxPendingPeersFlag,
 			utils.NATFlag,
 			utils.NoDiscoverFlag,
+			utils.DiscoveryV5Flag,
 			utils.NodeKeyFileFlag,
 			utils.NodeKeyHexFlag,
 		},
diff --git a/vendor/github.com/ethereum/go-ethereum/cmd/utils/flags.go b/vendor/github.com/ethereum/go-ethereum/cmd/utils/flags.go
index 5c36236f3..870f4433a 100644
--- a/vendor/github.com/ethereum/go-ethereum/cmd/utils/flags.go
+++ b/vendor/github.com/ethereum/go-ethereum/cmd/utils/flags.go
@@ -164,12 +164,12 @@ var (
 	LightServFlag = cli.IntFlag{
 		Name:  "lightserv",
 		Usage: "Maximum percentage of time allowed for serving LES requests (0-90)",
-		Value: 20,
+		Value: 80,
 	}
 	LightPeersFlag = cli.IntFlag{
 		Name:  "lightpeers",
 		Usage: "Maximum number of LES client peers",
-		Value: 10,
+		Value: 20,
 	}
 	LightKDFFlag = cli.BoolFlag{
 		Name:  "lightkdf",
@@ -346,6 +346,11 @@ var (
 		Usage: "Network listening port",
 		Value: 30303,
 	}
+	ListenPortV5Flag = cli.IntFlag{
+		Name:  "v5port",
+		Usage: "Experimental RLPx V5 (Topic Discovery) listening port",
+		Value: 30304,
+	}
 	BootnodesFlag = cli.StringFlag{
 		Name:  "bootnodes",
 		Usage: "Comma separated enode URLs for P2P discovery bootstrap",
@@ -368,6 +373,10 @@ var (
 		Name:  "nodiscover",
 		Usage: "Disables the peer discovery mechanism (manual peer addition)",
 	}
+	DiscoveryV5Flag = cli.BoolFlag{
+		Name:  "v5disc",
+		Usage: "Enables the experimental RLPx V5 (Topic Discovery) mechanism",
+	}
 	NoEthFlag = cli.BoolFlag{
 		Name:  "noeth",
 		Usage: "Disable Ethereum Protocol",
@@ -522,6 +531,10 @@ func MakeListenAddress(ctx *cli.Context) string {
 	return fmt.Sprintf(":%d", ctx.GlobalInt(ListenPortFlag.Name))
 }
 
+func MakeListenAddressV5(ctx *cli.Context) string {
+	return fmt.Sprintf(":%d", ctx.GlobalInt(ListenPortV5Flag.Name))
+}
+
 // MakeNAT creates a port mapper from set command line flags.
 func MakeNAT(ctx *cli.Context) nat.Interface {
 	natif, err := nat.Parse(ctx.GlobalString(NATFlag.Name))
@@ -653,8 +666,10 @@ func MakeNode(ctx *cli.Context, name, gitCommit string) *node.Node {
 		Version:           vsn,
 		UserIdent:         makeNodeUserIdent(ctx),
 		NoDiscovery:       ctx.GlobalBool(NoDiscoverFlag.Name),
+		DiscoveryV5:       ctx.GlobalBool(DiscoveryV5Flag.Name),
 		BootstrapNodes:    MakeBootstrapNodes(ctx),
 		ListenAddr:        MakeListenAddress(ctx),
+		ListenAddrV5:      MakeListenAddressV5(ctx),
 		NAT:               MakeNAT(ctx),
 		MaxPeers:          ctx.GlobalInt(MaxPeersFlag.Name),
 		MaxPendingPeers:   ctx.GlobalInt(MaxPendingPeersFlag.Name),
@@ -721,6 +736,7 @@ func RegisterEthService(ctx *cli.Context, stack *node.Node, extra []byte) {
 		NoDefSrv:                ctx.GlobalBool(NoDefSrvFlag.Name),
 		LightServ:               ctx.GlobalInt(LightServFlag.Name),
 		LightPeers:              ctx.GlobalInt(LightPeersFlag.Name),
+		MaxPeers:                ctx.GlobalInt(MaxPeersFlag.Name),
 		DatabaseCache:           ctx.GlobalInt(CacheFlag.Name),
 		DatabaseHandles:         MakeDatabaseHandles(),
 		NetworkId:               ctx.GlobalInt(NetworkIdFlag.Name),
@@ -774,7 +790,7 @@ func RegisterEthService(ctx *cli.Context, stack *node.Node, extra []byte) {
 	} else {
 		if err := stack.Register(func(ctx *node.ServiceContext) (node.Service, error) {
 			fullNode, err := eth.New(ctx, ethConf)
-			if fullNode != nil {
+			if fullNode != nil && ethConf.LightServ > 0 {
 				ls, _ := les.NewLesServer(fullNode, ethConf)
 				fullNode.AddLesServer(ls)
 			}
@@ -848,6 +864,13 @@ func MakeChainConfigFromDb(ctx *cli.Context, db ethdb.Database) *core.ChainConfi
 		}
 		config.DAOForkSupport = true
 	}
+	if config.HomesteadGasRepriceBlock == nil {
+		if ctx.GlobalBool(TestNetFlag.Name) {
+			config.HomesteadGasRepriceBlock = params.TestNetHomesteadGasRepriceBlock
+		} else {
+			config.HomesteadGasRepriceBlock = params.MainNetHomesteadGasRepriceBlock
+		}
+	}
 	// Force override any existing configs if explicitly requested
 	switch {
 	case ctx.GlobalBool(SupportDAOFork.Name):
diff --git a/vendor/github.com/ethereum/go-ethereum/common/format.go b/vendor/github.com/ethereum/go-ethereum/common/format.go
new file mode 100644
index 000000000..119637d2e
--- /dev/null
+++ b/vendor/github.com/ethereum/go-ethereum/common/format.go
@@ -0,0 +1,40 @@
+// Copyright 2016 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package common
+
+import (
+	"fmt"
+	"regexp"
+	"strings"
+	"time"
+)
+
+// PrettyDuration is a pretty printed version of a time.Duration value that cuts
+// the unnecessary precision off from the formatted textual representation.
+type PrettyDuration time.Duration
+
+var prettyDurationRe = regexp.MustCompile("\\.[0-9]+")
+
+// String implements the Stringer interface, allowing pretty printing of duration
+// values rounded to three decimals.
+func (d PrettyDuration) String() string {
+	label := fmt.Sprintf("%v", time.Duration(d))
+	if match := prettyDurationRe.FindString(label); len(match) > 4 {
+		label = strings.Replace(label, match, match[:4], 1)
+	}
+	return label
+}
diff --git a/vendor/github.com/ethereum/go-ethereum/console/bridge.go b/vendor/github.com/ethereum/go-ethereum/console/bridge.go
index 3009eabc4..22ed7192b 100644
--- a/vendor/github.com/ethereum/go-ethereum/console/bridge.go
+++ b/vendor/github.com/ethereum/go-ethereum/console/bridge.go
@@ -26,20 +26,18 @@ import (
 	"github.com/ethereum/go-ethereum/logger/glog"
 	"github.com/ethereum/go-ethereum/rpc"
 	"github.com/robertkrimen/otto"
-	"golang.org/x/net/context"
 )
 
 // bridge is a collection of JavaScript utility methods to bride the .js runtime
 // environment and the Go RPC connection backing the remote method calls.
 type bridge struct {
-	client   *rpc.ClientRestartWrapper   // RPC client to execute Ethereum requests through
+	client   *rpc.Client  // RPC client to execute Ethereum requests through
 	prompter UserPrompter // Input prompter to allow interactive user feedback
 	printer  io.Writer    // Output writer to serialize any display strings to
-	ctx context.Context
 }
 
 // newBridge creates a new JavaScript wrapper around an RPC client.
-func newBridge(client *rpc.ClientRestartWrapper, prompter UserPrompter, printer io.Writer) *bridge {
+func newBridge(client *rpc.Client, prompter UserPrompter, printer io.Writer) *bridge {
 	return &bridge{
 		client:   client,
 		prompter: prompter,
@@ -47,10 +45,6 @@ func newBridge(client *rpc.ClientRestartWrapper, prompter UserPrompter, printer
 	}
 }
 
-func (b *bridge) setContext(ctx context.Context) {
-	b.ctx = ctx
-}
-
 // NewAccount is a wrapper around the personal.newAccount RPC method that uses a
 // non-echoing password prompt to aquire the passphrase and executes the original
 // RPC method (saved in jeth.newAccount) with it to actually execute the RPC call.
@@ -228,26 +222,7 @@ func (b *bridge) Send(call otto.FunctionCall) (response otto.Value) {
 		resp, _ := call.Otto.Object(`({"jsonrpc":"2.0"})`)
 		resp.Set("id", req.Id)
 		var result json.RawMessage
-
-		client := b.client.Client()
-		errc := make(chan error, 1)
-		errc2 := make(chan error)
-		go func(){
-			if b.ctx != nil {
-				select {
-				case <-b.ctx.Done():
-					b.client.Restart()
-					errc2 <- b.ctx.Err()
-				case err := <-errc:
-					errc2 <- err
-				}
-			} else {
-				errc2 <- <-errc
-			}
-		}()
-		errc <- client.Call(&result, req.Method, req.Params...)
-		err = <-errc2
-
+		err = b.client.Call(&result, req.Method, req.Params...)
 		switch err := err.(type) {
 		case nil:
 			if result == nil {
diff --git a/vendor/github.com/ethereum/go-ethereum/console/console.go b/vendor/github.com/ethereum/go-ethereum/console/console.go
index 449deeaf3..f224f0c2e 100644
--- a/vendor/github.com/ethereum/go-ethereum/console/console.go
+++ b/vendor/github.com/ethereum/go-ethereum/console/console.go
@@ -26,7 +26,6 @@ import (
 	"regexp"
 	"sort"
 	"strings"
-	"time"
 
 	"github.com/ethereum/go-ethereum/internal/jsre"
 	"github.com/ethereum/go-ethereum/internal/web3ext"
@@ -34,7 +33,6 @@ import (
 	"github.com/mattn/go-colorable"
 	"github.com/peterh/liner"
 	"github.com/robertkrimen/otto"
-	"golang.org/x/net/context"
 )
 
 var (
@@ -52,27 +50,26 @@ const DefaultPrompt = "> "
 // Config is te collection of configurations to fine tune the behavior of the
 // JavaScript console.
 type Config struct {
-	DataDir  string                    // Data directory to store the console history at
-	DocRoot  string                    // Filesystem path from where to load JavaScript files from
-	Client   *rpc.ClientRestartWrapper // RPC client to execute Ethereum requests through
-	Prompt   string                    // Input prompt prefix string (defaults to DefaultPrompt)
-	Prompter UserPrompter              // Input prompter to allow interactive user feedback (defaults to TerminalPrompter)
-	Printer  io.Writer                 // Output writer to serialize any display strings to (defaults to os.Stdout)
-	Preload  []string                  // Absolute paths to JavaScript files to preload
+	DataDir  string       // Data directory to store the console history at
+	DocRoot  string       // Filesystem path from where to load JavaScript files from
+	Client   *rpc.Client  // RPC client to execute Ethereum requests through
+	Prompt   string       // Input prompt prefix string (defaults to DefaultPrompt)
+	Prompter UserPrompter // Input prompter to allow interactive user feedback (defaults to TerminalPrompter)
+	Printer  io.Writer    // Output writer to serialize any display strings to (defaults to os.Stdout)
+	Preload  []string     // Absolute paths to JavaScript files to preload
 }
 
 // Console is a JavaScript interpreted runtime environment. It is a fully fleged
 // JavaScript console attached to a running node via an external or in-process RPC
 // client.
 type Console struct {
-	client     *rpc.ClientRestartWrapper // RPC client to execute Ethereum requests through
-	jsre       *jsre.JSRE                // JavaScript runtime environment running the interpreter
-	prompt     string                    // Input prompt prefix string
-	prompter   UserPrompter              // Input prompter to allow interactive user feedback
-	histPath   string                    // Absolute path to the console scrollback history
-	history    []string                  // Scroll history maintained by the console
-	printer    io.Writer                 // Output writer to serialize any display strings to
-	setContext func(context.Context)
+	client   *rpc.Client  // RPC client to execute Ethereum requests through
+	jsre     *jsre.JSRE   // JavaScript runtime environment running the interpreter
+	prompt   string       // Input prompt prefix string
+	prompter UserPrompter // Input prompter to allow interactive user feedback
+	histPath string       // Absolute path to the console scrollback history
+	history  []string     // Scroll history maintained by the console
+	printer  io.Writer    // Output writer to serialize any display strings to
 }
 
 func New(config Config) (*Console, error) {
@@ -106,7 +103,6 @@ func New(config Config) (*Console, error) {
 func (c *Console) init(preload []string) error {
 	// Initialize the JavaScript <-> Go RPC bridge
 	bridge := newBridge(c.client, c.prompter, c.printer)
-	c.setContext = bridge.setContext
 	c.jsre.Set("jeth", struct{}{})
 
 	jethObj, _ := c.jsre.Get("jeth")
@@ -131,7 +127,7 @@ func (c *Console) init(preload []string) error {
 		return fmt.Errorf("web3 provider: %v", err)
 	}
 	// Load the supported APIs into the JavaScript runtime environment
-	apis, err := c.client.Client().SupportedModules()
+	apis, err := c.client.SupportedModules()
 	if err != nil {
 		return fmt.Errorf("api modules: %v", err)
 	}
@@ -257,7 +253,7 @@ func (c *Console) Welcome() {
 		console.log(" datadir: " + admin.datadir);
 	`)
 	// List all the supported modules for the user to call
-	if apis, err := c.client.Client().SupportedModules(); err == nil {
+	if apis, err := c.client.SupportedModules(); err == nil {
 		modules := make([]string, 0, len(apis))
 		for api, version := range apis {
 			modules = append(modules, fmt.Sprintf("%s:%s", api, version))
@@ -351,12 +347,7 @@ func (c *Console) Interactive() {
 						}
 					}
 				}
-				done := make(chan struct{})
-				ctx, _ := context.WithTimeout(context.Background(), time.Second*5)
-				c.setContext(ctx)
 				c.Evaluate(input)
-				c.setContext(nil)
-				close(done)
 				input = ""
 			}
 		}
diff --git a/vendor/github.com/ethereum/go-ethereum/core/blockchain.go b/vendor/github.com/ethereum/go-ethereum/core/blockchain.go
index fecda3f59..c822615b5 100644
--- a/vendor/github.com/ethereum/go-ethereum/core/blockchain.go
+++ b/vendor/github.com/ethereum/go-ethereum/core/blockchain.go
@@ -269,7 +269,7 @@ func (self *BlockChain) FastSyncCommitHead(hash common.Hash) error {
 	if block == nil {
 		return fmt.Errorf("non existent block [%x…]", hash[:4])
 	}
-	if _, err := trie.NewSecure(block.Root(), self.chainDb); err != nil {
+	if _, err := trie.NewSecure(block.Root(), self.chainDb, 0); err != nil {
 		return err
 	}
 	// If all checks out, manually set the head block
@@ -775,8 +775,12 @@ func (self *BlockChain) InsertReceiptChain(blockChain types.Blocks, receiptChain
 
 	// Report some public statistics so the user has a clue what's going on
 	first, last := blockChain[0], blockChain[len(blockChain)-1]
-	glog.V(logger.Info).Infof("imported %d receipt(s) (%d ignored) in %v. #%d [%x… / %x…]", stats.processed, stats.ignored,
-		time.Since(start), last.Number(), first.Hash().Bytes()[:4], last.Hash().Bytes()[:4])
+
+	ignored := ""
+	if stats.ignored > 0 {
+		ignored = fmt.Sprintf(" (%d ignored)", stats.ignored)
+	}
+	glog.V(logger.Info).Infof("imported %d receipts%s in %9v. #%d [%x… / %x…]", stats.processed, ignored, common.PrettyDuration(time.Since(start)), last.Number(), first.Hash().Bytes()[:4], last.Hash().Bytes()[:4])
 
 	return 0, nil
 }
@@ -840,19 +844,16 @@ func (self *BlockChain) InsertChain(chain types.Blocks) (int, error) {
 	// faster than direct delivery and requires much less mutex
 	// acquiring.
 	var (
-		stats         struct{ queued, processed, ignored int }
+		stats         = insertStats{startTime: time.Now()}
 		events        = make([]interface{}, 0, len(chain))
 		coalescedLogs vm.Logs
-		tstart        = time.Now()
-
-		nonceChecked = make([]bool, len(chain))
+		nonceChecked  = make([]bool, len(chain))
 	)
 
 	// Start the parallel nonce verifier.
 	nonceAbort, nonceResults := verifyNoncesFromBlocks(self.pow, chain)
 	defer close(nonceAbort)
 
-	txcount := 0
 	for i, block := range chain {
 		if atomic.LoadInt32(&self.procInterrupt) == 1 {
 			glog.V(logger.Debug).Infoln("Premature abort during block chain processing")
@@ -947,7 +948,6 @@ func (self *BlockChain) InsertChain(chain types.Blocks) (int, error) {
 			return i, err
 		}
 
-		txcount += len(block.Transactions())
 		// write the block to the chain and get the status
 		status, err := self.WriteBlock(block)
 		if err != nil {
@@ -957,8 +957,9 @@ func (self *BlockChain) InsertChain(chain types.Blocks) (int, error) {
 		switch status {
 		case CanonStatTy:
 			if glog.V(logger.Debug) {
-				glog.Infof("[%v] inserted block #%d (%d TXs %v G %d UNCs) (%x...). Took %v\n", time.Now().UnixNano(), block.Number(), len(block.Transactions()), block.GasUsed(), len(block.Uncles()), block.Hash().Bytes()[0:4], time.Since(bstart))
+				glog.Infof("inserted block #%d [%x…] in %9v: %3d txs %7v gas %d uncles.", block.Number(), block.Hash().Bytes()[0:4], common.PrettyDuration(time.Since(bstart)), len(block.Transactions()), block.GasUsed(), len(block.Uncles()))
 			}
+			blockInsertTimer.UpdateSince(bstart)
 			events = append(events, ChainEvent{block, block.Hash(), logs})
 
 			// This puts transactions in a extra db for rpc
@@ -975,26 +976,65 @@ func (self *BlockChain) InsertChain(chain types.Blocks) (int, error) {
 			}
 		case SideStatTy:
 			if glog.V(logger.Detail) {
-				glog.Infof("inserted forked block #%d (TD=%v) (%d TXs %d UNCs) (%x...). Took %v\n", block.Number(), block.Difficulty(), len(block.Transactions()), len(block.Uncles()), block.Hash().Bytes()[0:4], time.Since(bstart))
+				glog.Infof("inserted forked block #%d [%x…] (TD=%v) in %9v: %3d txs %d uncles.", block.Number(), block.Hash().Bytes()[0:4], block.Difficulty(), common.PrettyDuration(time.Since(bstart)), len(block.Transactions()), len(block.Uncles()))
 			}
+			blockInsertTimer.UpdateSince(bstart)
 			events = append(events, ChainSideEvent{block, logs})
 
 		case SplitStatTy:
 			events = append(events, ChainSplitEvent{block, logs})
 		}
+
 		stats.processed++
+		if glog.V(logger.Info) {
+			stats.report(chain, i)
+		}
 	}
 
-	if (stats.queued > 0 || stats.processed > 0 || stats.ignored > 0) && bool(glog.V(logger.Info)) {
-		tend := time.Since(tstart)
-		start, end := chain[0], chain[len(chain)-1]
-		glog.Infof("imported %d block(s) (%d queued %d ignored) including %d txs in %v. #%v [%x / %x]\n", stats.processed, stats.queued, stats.ignored, txcount, tend, end.Number(), start.Hash().Bytes()[:4], end.Hash().Bytes()[:4])
-	}
 	go self.postChainEvents(events, coalescedLogs)
 
 	return 0, nil
 }
 
+// insertStats tracks and reports on block insertion.
+type insertStats struct {
+	queued, processed, ignored int
+	lastIndex                  int
+	startTime                  time.Time
+}
+
+// statsReportLimit is the time limit during import after which we always print
+// out progress. This avoids the user wondering what's going on.
+const statsReportLimit = 8 * time.Second
+
+// report prints statistics if some number of blocks have been processed
+// or more than a few seconds have passed since the last message.
+func (st *insertStats) report(chain []*types.Block, index int) {
+	var (
+		now     = time.Now()
+		elapsed = now.Sub(st.startTime)
+	)
+	if index == len(chain)-1 || elapsed >= statsReportLimit {
+		start, end := chain[st.lastIndex], chain[index]
+		txcount := countTransactions(chain[st.lastIndex : index+1])
+
+		extra := ""
+		if st.queued > 0 || st.ignored > 0 {
+			extra = fmt.Sprintf(" (%d queued %d ignored)", st.queued, st.ignored)
+		}
+		glog.Infof("imported %d blocks%s, %5d txs in %9v. #%v [%x… / %x…]\n", st.processed, extra, txcount, common.PrettyDuration(elapsed), end.Number(), start.Hash().Bytes()[:4], end.Hash().Bytes()[:4])
+
+		*st = insertStats{startTime: now, lastIndex: index}
+	}
+}
+
+func countTransactions(chain []*types.Block) (c int) {
+	for _, b := range chain {
+		c += len(b.Transactions())
+	}
+	return c
+}
+
 // reorgs takes two blocks, an old chain and a new chain and will reconstruct the blocks and inserts them
 // to be part of the new canonical chain and accumulates potential missing transactions and post an
 // event about them
diff --git a/vendor/github.com/ethereum/go-ethereum/core/config.go b/vendor/github.com/ethereum/go-ethereum/core/config.go
index c0d065a57..3ab04e520 100644
--- a/vendor/github.com/ethereum/go-ethereum/core/config.go
+++ b/vendor/github.com/ethereum/go-ethereum/core/config.go
@@ -21,6 +21,7 @@ import (
 	"math/big"
 
 	"github.com/ethereum/go-ethereum/core/vm"
+	"github.com/ethereum/go-ethereum/params"
 )
 
 var ChainConfigNotFoundErr = errors.New("ChainConfig not found") // general config not found error
@@ -35,6 +36,8 @@ type ChainConfig struct {
 	DAOForkBlock   *big.Int `json:"daoForkBlock"`   // TheDAO hard-fork switch block (nil = no fork)
 	DAOForkSupport bool     `json:"daoForkSupport"` // Whether the nodes supports or opposes the DAO hard-fork
 
+	HomesteadGasRepriceBlock *big.Int `json:"homesteadGasRepriceBlock"` // Homestead gas reprice switch block (nil = no fork)
+
 	VmConfig vm.Config `json:"-"`
 }
 
@@ -45,3 +48,14 @@ func (c *ChainConfig) IsHomestead(num *big.Int) bool {
 	}
 	return num.Cmp(c.HomesteadBlock) >= 0
 }
+
+// GasTable returns the gas table corresponding to the current phase (homestead or homestead reprice).
+//
+// The returned GasTable's fields shouldn't, under any circumstances, be changed.
+func (c *ChainConfig) GasTable(num *big.Int) params.GasTable {
+	if c.HomesteadGasRepriceBlock == nil || num == nil || num.Cmp(c.HomesteadGasRepriceBlock) < 0 {
+		return params.GasTableHomestead
+	}
+
+	return params.GasTableHomesteadGasRepriceFork
+}
diff --git a/vendor/github.com/ethereum/go-ethereum/core/headerchain.go b/vendor/github.com/ethereum/go-ethereum/core/headerchain.go
index 0f9dd7208..8ca06d9b4 100644
--- a/vendor/github.com/ethereum/go-ethereum/core/headerchain.go
+++ b/vendor/github.com/ethereum/go-ethereum/core/headerchain.go
@@ -18,6 +18,7 @@ package core
 
 import (
 	crand "crypto/rand"
+	"fmt"
 	"math"
 	"math/big"
 	mrand "math/rand"
@@ -321,8 +322,12 @@ func (hc *HeaderChain) InsertHeaderChain(chain []*types.Header, checkFreq int, w
 	}
 	// Report some public statistics so the user has a clue what's going on
 	first, last := chain[0], chain[len(chain)-1]
-	glog.V(logger.Info).Infof("imported %d header(s) (%d ignored) in %v. #%v [%x… / %x…]", stats.processed, stats.ignored,
-		time.Since(start), last.Number, first.Hash().Bytes()[:4], last.Hash().Bytes()[:4])
+
+	ignored := ""
+	if stats.ignored > 0 {
+		ignored = fmt.Sprintf(" (%d ignored)", stats.ignored)
+	}
+	glog.V(logger.Info).Infof("imported %d headers%s in %9v. #%v [%x… / %x…]", stats.processed, ignored, common.PrettyDuration(time.Since(start)), last.Number, first.Hash().Bytes()[:4], last.Hash().Bytes()[:4])
 
 	return 0, nil
 }
diff --git a/vendor/github.com/ethereum/go-ethereum/core/state/state_object.go b/vendor/github.com/ethereum/go-ethereum/core/state/state_object.go
index 6eab27d9e..edb073173 100644
--- a/vendor/github.com/ethereum/go-ethereum/core/state/state_object.go
+++ b/vendor/github.com/ethereum/go-ethereum/core/state/state_object.go
@@ -137,9 +137,9 @@ func (self *StateObject) markSuicided() {
 func (c *StateObject) getTrie(db trie.Database) *trie.SecureTrie {
 	if c.trie == nil {
 		var err error
-		c.trie, err = trie.NewSecure(c.data.Root, db)
+		c.trie, err = trie.NewSecure(c.data.Root, db, 0)
 		if err != nil {
-			c.trie, _ = trie.NewSecure(common.Hash{}, db)
+			c.trie, _ = trie.NewSecure(common.Hash{}, db, 0)
 			c.setError(fmt.Errorf("can't create storage trie: %v", err))
 		}
 	}
diff --git a/vendor/github.com/ethereum/go-ethereum/core/state/statedb.go b/vendor/github.com/ethereum/go-ethereum/core/state/statedb.go
index ec9e9392f..dcb897628 100644
--- a/vendor/github.com/ethereum/go-ethereum/core/state/statedb.go
+++ b/vendor/github.com/ethereum/go-ethereum/core/state/statedb.go
@@ -41,7 +41,10 @@ var StartingNonce uint64
 const (
 	// Number of past tries to keep. The arbitrarily chosen value here
 	// is max uncle depth + 1.
-	maxTrieCacheLength = 8
+	maxPastTries = 8
+
+	// Trie cache generation limit.
+	maxTrieCacheGen = 100
 
 	// Number of codehash->size associations to keep.
 	codeSizeCacheSize = 100000
@@ -86,7 +89,7 @@ type StateDB struct {
 
 // Create a new state from a given trie
 func New(root common.Hash, db ethdb.Database) (*StateDB, error) {
-	tr, err := trie.NewSecure(root, db)
+	tr, err := trie.NewSecure(root, db, maxTrieCacheGen)
 	if err != nil {
 		return nil, err
 	}
@@ -155,14 +158,14 @@ func (self *StateDB) openTrie(root common.Hash) (*trie.SecureTrie, error) {
 			return &tr, nil
 		}
 	}
-	return trie.NewSecure(root, self.db)
+	return trie.NewSecure(root, self.db, maxTrieCacheGen)
 }
 
 func (self *StateDB) pushTrie(t *trie.SecureTrie) {
 	self.lock.Lock()
 	defer self.lock.Unlock()
 
-	if len(self.pastTries) >= maxTrieCacheLength {
+	if len(self.pastTries) >= maxPastTries {
 		copy(self.pastTries, self.pastTries[1:])
 		self.pastTries[len(self.pastTries)-1] = t
 	} else {
diff --git a/vendor/github.com/ethereum/go-ethereum/core/tx_pool.go b/vendor/github.com/ethereum/go-ethereum/core/tx_pool.go
index 10a110e0b..2c8a5c396 100644
--- a/vendor/github.com/ethereum/go-ethereum/core/tx_pool.go
+++ b/vendor/github.com/ethereum/go-ethereum/core/tx_pool.go
@@ -30,6 +30,7 @@ import (
 	"github.com/ethereum/go-ethereum/event"
 	"github.com/ethereum/go-ethereum/logger"
 	"github.com/ethereum/go-ethereum/logger/glog"
+	"gopkg.in/karalabe/cookiejar.v2/collections/prque"
 )
 
 var (
@@ -46,10 +47,12 @@ var (
 )
 
 var (
-	maxQueuedPerAccount = uint64(64)    // Max limit of queued transactions per address
-	maxQueuedInTotal    = uint64(65536) // Max limit of queued transactions from all accounts
-	maxQueuedLifetime   = 3 * time.Hour // Max amount of time transactions from idle accounts are queued
-	evictionInterval    = time.Minute   // Time interval to check for evictable transactions
+	minPendingPerAccount = uint64(16)    // Min number of guaranteed transaction slots per address
+	maxPendingTotal      = uint64(4096)  // Max limit of pending transactions from all accounts (soft)
+	maxQueuedPerAccount  = uint64(64)    // Max limit of queued transactions per address
+	maxQueuedInTotal     = uint64(1024)  // Max limit of queued transactions from all accounts
+	maxQueuedLifetime    = 3 * time.Hour // Max amount of time transactions from idle accounts are queued
+	evictionInterval     = time.Minute   // Time interval to check for evictable transactions
 )
 
 type stateFn func() (*state.StateDB, error)
@@ -481,7 +484,6 @@ func (pool *TxPool) promoteExecutables() {
 	}
 	// Iterate over all accounts and promote any executable transactions
 	queued := uint64(0)
-
 	for addr, list := range pool.queue {
 		// Drop all transactions that are deemed too old (low nonce)
 		for _, tx := range list.Forward(state.GetNonce(addr)) {
@@ -519,6 +521,59 @@ func (pool *TxPool) promoteExecutables() {
 			delete(pool.queue, addr)
 		}
 	}
+	// If the pending limit is overflown, start equalizing allowances
+	pending := uint64(0)
+	for _, list := range pool.pending {
+		pending += uint64(list.Len())
+	}
+	if pending > maxPendingTotal {
+		// Assemble a spam order to penalize large transactors first
+		spammers := prque.New()
+		for addr, list := range pool.pending {
+			// Only evict transactions from high rollers
+			if uint64(list.Len()) > minPendingPerAccount {
+				// Skip local accounts as pools should maintain backlogs for themselves
+				for _, tx := range list.txs.items {
+					if !pool.localTx.contains(tx.Hash()) {
+						spammers.Push(addr, float32(list.Len()))
+					}
+					break // Checking on transaction for locality is enough
+				}
+			}
+		}
+		// Gradually drop transactions from offenders
+		offenders := []common.Address{}
+		for pending > maxPendingTotal && !spammers.Empty() {
+			// Retrieve the next offender if not local address
+			offender, _ := spammers.Pop()
+			offenders = append(offenders, offender.(common.Address))
+
+			// Equalize balances until all the same or below threshold
+			if len(offenders) > 1 {
+				// Calculate the equalization threshold for all current offenders
+				threshold := pool.pending[offender.(common.Address)].Len()
+
+				// Iteratively reduce all offenders until below limit or threshold reached
+				for pending > maxPendingTotal && pool.pending[offenders[len(offenders)-2]].Len() > threshold {
+					for i := 0; i < len(offenders)-1; i++ {
+						list := pool.pending[offenders[i]]
+						list.Cap(list.Len() - 1)
+						pending--
+					}
+				}
+			}
+		}
+		// If still above threshold, reduce to limit or min allowance
+		if pending > maxPendingTotal && len(offenders) > 0 {
+			for pending > maxPendingTotal && uint64(pool.pending[offenders[len(offenders)-1]].Len()) > minPendingPerAccount {
+				for _, addr := range offenders {
+					list := pool.pending[addr]
+					list.Cap(list.Len() - 1)
+					pending--
+				}
+			}
+		}
+	}
 	// If we've queued more transactions than the hard limit, drop oldest ones
 	if queued > maxQueuedInTotal {
 		// Sort all accounts with queued transactions by heartbeat
diff --git a/vendor/github.com/ethereum/go-ethereum/core/vm/environment.go b/vendor/github.com/ethereum/go-ethereum/core/vm/environment.go
index a4b2ac196..f8996e648 100644
--- a/vendor/github.com/ethereum/go-ethereum/core/vm/environment.go
+++ b/vendor/github.com/ethereum/go-ethereum/core/vm/environment.go
@@ -20,12 +20,16 @@ import (
 	"math/big"
 
 	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/params"
 )
 
 // RuleSet is an interface that defines the current rule set during the
 // execution of the EVM instructions (e.g. whether it's homestead)
 type RuleSet interface {
 	IsHomestead(*big.Int) bool
+	// GasTable returns the gas prices for this phase, which is based on
+	// block number passed in.
+	GasTable(*big.Int) params.GasTable
 }
 
 // Environment is an EVM requirement and helper which allows access to outside
diff --git a/vendor/github.com/ethereum/go-ethereum/core/vm/gas.go b/vendor/github.com/ethereum/go-ethereum/core/vm/gas.go
index eb2c16346..fdbc0df7f 100644
--- a/vendor/github.com/ethereum/go-ethereum/core/vm/gas.go
+++ b/vendor/github.com/ethereum/go-ethereum/core/vm/gas.go
@@ -35,8 +35,27 @@ var (
 	GasStop   = big.NewInt(0)
 
 	GasContractByte = big.NewInt(200)
+
+	n64 = big.NewInt(64)
 )
 
+// calcGas returns the actual gas cost of the call.
+//
+// The cost of gas was changed during the homestead price change HF. To allow for EIP150
+// to be implemented. The returned gas is gas - base * 63 / 64.
+func callGas(gasTable params.GasTable, availableGas, base, callCost *big.Int) *big.Int {
+	if gasTable.CreateBySuicide != nil {
+		availableGas = new(big.Int).Sub(availableGas, base)
+		g := new(big.Int).Div(availableGas, n64)
+		g.Sub(availableGas, g)
+
+		if g.Cmp(callCost) < 0 {
+			return g
+		}
+	}
+	return callCost
+}
+
 // baseCheck checks for any stack error underflows
 func baseCheck(op OpCode, stack *Stack, gas *big.Int) error {
 	// PUSH and DUP are a bit special. They all cost the same but we do want to have checking on stack push limit
@@ -127,18 +146,19 @@ var _baseCheck = map[OpCode]req{
 	MSIZE:        {0, GasQuickStep, 1},
 	GAS:          {0, GasQuickStep, 1},
 	BLOCKHASH:    {1, GasExtStep, 1},
-	BALANCE:      {1, GasExtStep, 1},
-	EXTCODESIZE:  {1, GasExtStep, 1},
-	EXTCODECOPY:  {4, GasExtStep, 0},
+	BALANCE:      {1, Zero, 1},
+	EXTCODESIZE:  {1, Zero, 1},
+	EXTCODECOPY:  {4, Zero, 0},
 	SLOAD:        {1, params.SloadGas, 1},
 	SSTORE:       {2, Zero, 0},
 	SHA3:         {2, params.Sha3Gas, 1},
 	CREATE:       {3, params.CreateGas, 1},
-	CALL:         {7, params.CallGas, 1},
-	CALLCODE:     {7, params.CallGas, 1},
-	DELEGATECALL: {6, params.CallGas, 1},
-	JUMPDEST:     {0, params.JumpdestGas, 0},
+	// Zero is calculated in the gasSwitch
+	CALL:         {7, Zero, 1},
+	CALLCODE:     {7, Zero, 1},
+	DELEGATECALL: {6, Zero, 1},
 	SUICIDE:      {1, Zero, 0},
+	JUMPDEST:     {0, params.JumpdestGas, 0},
 	RETURN:       {2, Zero, 0},
 	PUSH1:        {0, GasFastestStep, 1},
 	DUP1:         {0, Zero, 1},
diff --git a/vendor/github.com/ethereum/go-ethereum/core/vm/instructions.go b/vendor/github.com/ethereum/go-ethereum/core/vm/instructions.go
index 79aee60d2..3352877c1 100644
--- a/vendor/github.com/ethereum/go-ethereum/core/vm/instructions.go
+++ b/vendor/github.com/ethereum/go-ethereum/core/vm/instructions.go
@@ -514,7 +514,12 @@ func opCreate(instr instruction, pc *uint64, env Environment, contract *Contract
 		input        = memory.Get(offset.Int64(), size.Int64())
 		gas          = new(big.Int).Set(contract.Gas)
 	)
-	contract.UseGas(contract.Gas)
+	if env.RuleSet().GasTable(env.BlockNumber()).CreateBySuicide != nil {
+		gas.Div(gas, n64)
+		gas = gas.Sub(contract.Gas, gas)
+	}
+
+	contract.UseGas(gas)
 	_, addr, suberr := env.Create(contract, input, gas, contract.Price, value)
 	// Push item on the stack based on the returned error. If the ruleset is
 	// homestead we must check for CodeStoreOutOfGasError (homestead only
diff --git a/vendor/github.com/ethereum/go-ethereum/core/vm/runtime/runtime.go b/vendor/github.com/ethereum/go-ethereum/core/vm/runtime/runtime.go
index 6d980cb32..343aee514 100644
--- a/vendor/github.com/ethereum/go-ethereum/core/vm/runtime/runtime.go
+++ b/vendor/github.com/ethereum/go-ethereum/core/vm/runtime/runtime.go
@@ -25,12 +25,16 @@ import (
 	"github.com/ethereum/go-ethereum/core/vm"
 	"github.com/ethereum/go-ethereum/crypto"
 	"github.com/ethereum/go-ethereum/ethdb"
+	"github.com/ethereum/go-ethereum/params"
 )
 
 // The default, always homestead, rule set for the vm env
 type ruleSet struct{}
 
 func (ruleSet) IsHomestead(*big.Int) bool { return true }
+func (ruleSet) GasTable(*big.Int) params.GasTable {
+	return params.GasTableHomesteadGasRepriceFork
+}
 
 // Config is a basic type specifying certain configuration flags for running
 // the EVM.
diff --git a/vendor/github.com/ethereum/go-ethereum/core/vm/vm.go b/vendor/github.com/ethereum/go-ethereum/core/vm/vm.go
index 033ada21c..fcffcf317 100644
--- a/vendor/github.com/ethereum/go-ethereum/core/vm/vm.go
+++ b/vendor/github.com/ethereum/go-ethereum/core/vm/vm.go
@@ -44,6 +44,7 @@ type EVM struct {
 	env       Environment
 	jumpTable vmJumpTable
 	cfg       Config
+	gasTable  params.GasTable
 }
 
 // New returns a new instance of the EVM.
@@ -52,6 +53,7 @@ func New(env Environment, cfg Config) *EVM {
 		env:       env,
 		jumpTable: newJumpTable(env.RuleSet(), env.BlockNumber()),
 		cfg:       cfg,
+		gasTable:  env.RuleSet().GasTable(env.BlockNumber()),
 	}
 }
 
@@ -169,7 +171,7 @@ func (evm *EVM) Run(contract *Contract, input []byte) (ret []byte, err error) {
 		// Get the memory location of pc
 		op = contract.GetOp(pc)
 		// calculate the new memory size and gas price for the current executing opcode
-		newMemSize, cost, err = calculateGasAndSize(evm.env, contract, caller, op, statedb, mem, stack)
+		newMemSize, cost, err = calculateGasAndSize(evm.gasTable, evm.env, contract, caller, op, statedb, mem, stack)
 		if err != nil {
 			return nil, err
 		}
@@ -234,7 +236,7 @@ func (evm *EVM) Run(contract *Contract, input []byte) (ret []byte, err error) {
 
 // calculateGasAndSize calculates the required given the opcode and stack items calculates the new memorysize for
 // the operation. This does not reduce gas or resizes the memory.
-func calculateGasAndSize(env Environment, contract *Contract, caller ContractRef, op OpCode, statedb Database, mem *Memory, stack *Stack) (*big.Int, *big.Int, error) {
+func calculateGasAndSize(gasTable params.GasTable, env Environment, contract *Contract, caller ContractRef, op OpCode, statedb Database, mem *Memory, stack *Stack) (*big.Int, *big.Int, error) {
 	var (
 		gas                 = new(big.Int)
 		newMemSize *big.Int = new(big.Int)
@@ -246,6 +248,24 @@ func calculateGasAndSize(env Environment, contract *Contract, caller ContractRef
 
 	// stack Check, memory resize & gas phase
 	switch op {
+	case SUICIDE:
+		// if suicide is not nil: homestead gas fork
+		if gasTable.CreateBySuicide != nil {
+			gas.Set(gasTable.Suicide)
+			if !env.Db().Exist(common.BigToAddress(stack.data[len(stack.data)-1])) {
+				gas.Add(gas, gasTable.CreateBySuicide)
+			}
+		}
+
+		if !statedb.HasSuicided(contract.Address()) {
+			statedb.AddRefund(params.SuicideRefundGas)
+		}
+	case EXTCODESIZE:
+		gas.Set(gasTable.ExtcodeSize)
+	case BALANCE:
+		gas.Set(gasTable.Balance)
+	case SLOAD:
+		gas.Set(gasTable.SLoad)
 	case SWAP1, SWAP2, SWAP3, SWAP4, SWAP5, SWAP6, SWAP7, SWAP8, SWAP9, SWAP10, SWAP11, SWAP12, SWAP13, SWAP14, SWAP15, SWAP16:
 		n := int(op - SWAP1 + 2)
 		err := stack.require(n)
@@ -274,6 +294,8 @@ func calculateGasAndSize(env Environment, contract *Contract, caller ContractRef
 		gas.Add(gas, new(big.Int).Mul(mSize, params.LogDataGas))
 
 		newMemSize = calcMemSize(mStart, mSize)
+
+		quadMemGas(mem, newMemSize, gas)
 	case EXP:
 		gas.Add(gas, new(big.Int).Mul(big.NewInt(int64(len(stack.data[stack.len()-2].Bytes()))), params.ExpByteGas))
 	case SSTORE:
@@ -302,67 +324,100 @@ func calculateGasAndSize(env Environment, contract *Contract, caller ContractRef
 			g = params.SstoreResetGas
 		}
 		gas.Set(g)
-	case SUICIDE:
-		if !statedb.HasSuicided(contract.Address()) {
-			statedb.AddRefund(params.SuicideRefundGas)
-		}
 	case MLOAD:
 		newMemSize = calcMemSize(stack.peek(), u256(32))
+		quadMemGas(mem, newMemSize, gas)
 	case MSTORE8:
 		newMemSize = calcMemSize(stack.peek(), u256(1))
+		quadMemGas(mem, newMemSize, gas)
 	case MSTORE:
 		newMemSize = calcMemSize(stack.peek(), u256(32))
+		quadMemGas(mem, newMemSize, gas)
 	case RETURN:
 		newMemSize = calcMemSize(stack.peek(), stack.data[stack.len()-2])
+		quadMemGas(mem, newMemSize, gas)
 	case SHA3:
 		newMemSize = calcMemSize(stack.peek(), stack.data[stack.len()-2])
 
 		words := toWordSize(stack.data[stack.len()-2])
 		gas.Add(gas, words.Mul(words, params.Sha3WordGas))
+
+		quadMemGas(mem, newMemSize, gas)
 	case CALLDATACOPY:
 		newMemSize = calcMemSize(stack.peek(), stack.data[stack.len()-3])
 
 		words := toWordSize(stack.data[stack.len()-3])
 		gas.Add(gas, words.Mul(words, params.CopyGas))
+
+		quadMemGas(mem, newMemSize, gas)
 	case CODECOPY:
 		newMemSize = calcMemSize(stack.peek(), stack.data[stack.len()-3])
 
 		words := toWordSize(stack.data[stack.len()-3])
 		gas.Add(gas, words.Mul(words, params.CopyGas))
+
+		quadMemGas(mem, newMemSize, gas)
 	case EXTCODECOPY:
+		gas.Set(gasTable.ExtcodeCopy)
+
 		newMemSize = calcMemSize(stack.data[stack.len()-2], stack.data[stack.len()-4])
 
 		words := toWordSize(stack.data[stack.len()-4])
 		gas.Add(gas, words.Mul(words, params.CopyGas))
 
+		quadMemGas(mem, newMemSize, gas)
 	case CREATE:
 		newMemSize = calcMemSize(stack.data[stack.len()-2], stack.data[stack.len()-3])
+
+		quadMemGas(mem, newMemSize, gas)
 	case CALL, CALLCODE:
-		gas.Add(gas, stack.data[stack.len()-1])
+		gas.Set(gasTable.Calls)
 
 		if op == CALL {
 			if !env.Db().Exist(common.BigToAddress(stack.data[stack.len()-2])) {
 				gas.Add(gas, params.CallNewAccountGas)
 			}
 		}
-
 		if len(stack.data[stack.len()-3].Bytes()) > 0 {
 			gas.Add(gas, params.CallValueTransferGas)
 		}
-
 		x := calcMemSize(stack.data[stack.len()-6], stack.data[stack.len()-7])
 		y := calcMemSize(stack.data[stack.len()-4], stack.data[stack.len()-5])
 
 		newMemSize = common.BigMax(x, y)
+
+		quadMemGas(mem, newMemSize, gas)
+
+		cg := callGas(gasTable, contract.Gas, gas, stack.data[stack.len()-1])
+		// Replace the stack item with the new gas calculation. This means that
+		// either the original item is left on the stack or the item is replaced by:
+		// (availableGas - gas) * 63 / 64
+		// We replace the stack item so that it's available when the opCall instruction is
+		// called. This information is otherwise lost due to the dependency on *current*
+		// available gas.
+		stack.data[stack.len()-1] = cg
+		gas.Add(gas, cg)
+
 	case DELEGATECALL:
-		gas.Add(gas, stack.data[stack.len()-1])
+		gas.Set(gasTable.Calls)
 
 		x := calcMemSize(stack.data[stack.len()-5], stack.data[stack.len()-6])
 		y := calcMemSize(stack.data[stack.len()-3], stack.data[stack.len()-4])
 
 		newMemSize = common.BigMax(x, y)
+
+		quadMemGas(mem, newMemSize, gas)
+
+		cg := callGas(gasTable, contract.Gas, gas, stack.data[stack.len()-1])
+		// Replace the stack item with the new gas calculation. This means that
+		// either the original item is left on the stack or the item is replaced by:
+		// (availableGas - gas) * 63 / 64
+		// We replace the stack item so that it's available when the opCall instruction is
+		// called.
+		stack.data[stack.len()-1] = cg
+		gas.Add(gas, cg)
+
 	}
-	quadMemGas(mem, newMemSize, gas)
 
 	return newMemSize, gas, nil
 }
diff --git a/vendor/github.com/ethereum/go-ethereum/eth/backend.go b/vendor/github.com/ethereum/go-ethereum/eth/backend.go
index 3736588d1..61d64c80e 100644
--- a/vendor/github.com/ethereum/go-ethereum/eth/backend.go
+++ b/vendor/github.com/ethereum/go-ethereum/eth/backend.go
@@ -73,6 +73,7 @@ type Config struct {
 	NoDefSrv   bool   // No default LES server
 	LightServ  int    // Maximum percentage of time allowed for serving LES requests
 	LightPeers int    // Maximum number of LES client peers
+	MaxPeers   int    // Maximum number of global peers
 
 	SkipBcVersionCheck bool // e.g. blockchain export
 	DatabaseCache      int
@@ -121,7 +122,7 @@ type Ethereum struct {
 	txMu            sync.Mutex
 	blockchain      *core.BlockChain
 	protocolManager *ProtocolManager
-	ls              LesServer
+	lesServer       LesServer
 	// DB interfaces
 	chainDb ethdb.Database // Block chain database
 
@@ -147,7 +148,7 @@ type Ethereum struct {
 }
 
 func (s *Ethereum) AddLesServer(ls LesServer) {
-	s.ls = ls
+	s.lesServer = ls
 }
 
 // New creates a new Ethereum object (including the
@@ -232,7 +233,18 @@ func New(ctx *node.ServiceContext, config *Config) (*Ethereum, error) {
 	newPool := core.NewTxPool(eth.chainConfig, eth.EventMux(), eth.blockchain.State, eth.blockchain.GasLimit)
 	eth.txPool = newPool
 
-	if eth.protocolManager, err = NewProtocolManager(eth.chainConfig, config.FastSync, config.NetworkId, eth.eventMux, eth.txPool, eth.pow, eth.blockchain, chainDb); err != nil {
+	maxPeers := config.MaxPeers
+	if config.LightServ > 0 {
+		// if we are running a light server, limit the number of ETH peers so that we reserve some space for incoming LES connections
+		// temporary solution until the new peer connectivity API is finished
+		halfPeers := maxPeers / 2
+		maxPeers -= config.LightPeers
+		if maxPeers < halfPeers {
+			maxPeers = halfPeers
+		}
+	}
+
+	if eth.protocolManager, err = NewProtocolManager(eth.chainConfig, config.FastSync, config.NetworkId, maxPeers, eth.eventMux, eth.txPool, eth.pow, eth.blockchain, chainDb); err != nil {
 		return nil, err
 	}
 	eth.miner = miner.New(eth, eth.chainConfig, eth.EventMux(), eth.pow)
@@ -327,7 +339,7 @@ func (s *Ethereum) APIs() []rpc.API {
 		}, {
 			Namespace: "eth",
 			Version:   "1.0",
-			Service:   filters.NewPublicFilterAPI(s.ApiBackend),
+			Service:   filters.NewPublicFilterAPI(s.ApiBackend, true),
 			Public:    true,
 		}, {
 			Namespace: "admin",
@@ -395,10 +407,10 @@ func (s *Ethereum) Downloader() *downloader.Downloader { return s.protocolManage
 // Protocols implements node.Service, returning all the currently configured
 // network protocols to start.
 func (s *Ethereum) Protocols() []p2p.Protocol {
-	if s.ls == nil {
+	if s.lesServer == nil {
 		return s.protocolManager.SubProtocols
 	} else {
-		return append(s.protocolManager.SubProtocols, s.ls.Protocols()...)
+		return append(s.protocolManager.SubProtocols, s.lesServer.Protocols()...)
 	}
 }
 
@@ -410,8 +422,8 @@ func (s *Ethereum) Start(srvr *p2p.Server) error {
 		s.StartAutoDAG()
 	}
 	s.protocolManager.Start()
-	if s.ls != nil {
-		s.ls.Start()
+	if s.lesServer != nil {
+		s.lesServer.Start()
 	}
 	return nil
 }
@@ -424,8 +436,8 @@ func (s *Ethereum) Stop() error {
 	}
 	s.blockchain.Stop()
 	s.protocolManager.Stop()
-	if s.ls != nil {
-		s.ls.Stop()
+	if s.lesServer != nil {
+		s.lesServer.Stop()
 	}
 	s.txPool.Stop()
 	s.miner.Stop()
diff --git a/vendor/github.com/ethereum/go-ethereum/eth/db_upgrade.go b/vendor/github.com/ethereum/go-ethereum/eth/db_upgrade.go
index a0bce7f92..172bb0954 100644
--- a/vendor/github.com/ethereum/go-ethereum/eth/db_upgrade.go
+++ b/vendor/github.com/ethereum/go-ethereum/eth/db_upgrade.go
@@ -50,6 +50,8 @@ func upgradeSequentialKeys(db ethdb.Database) (stopFn func()) {
 		return nil // empty database, nothing to do
 	}
 
+	glog.V(logger.Info).Infof("Upgrading chain database to use sequential keys")
+
 	stopChn := make(chan struct{})
 	stoppedChn := make(chan struct{})
 
diff --git a/vendor/github.com/ethereum/go-ethereum/eth/downloader/downloader.go b/vendor/github.com/ethereum/go-ethereum/eth/downloader/downloader.go
index 1952d57ab..36c46f44d 100644
--- a/vendor/github.com/ethereum/go-ethereum/eth/downloader/downloader.go
+++ b/vendor/github.com/ethereum/go-ethereum/eth/downloader/downloader.go
@@ -952,7 +952,7 @@ func (d *Downloader) fetchNodeData() error {
 
 				// Log a message to the user and return
 				if delivered > 0 {
-					glog.V(logger.Info).Infof("imported %d state entries in %v: processed %d, pending at least %d", delivered, time.Since(start), d.syncStatsStateDone, pending)
+					glog.V(logger.Info).Infof("imported %d state entries in %9v: processed %d, pending at least %d", delivered, common.PrettyDuration(time.Since(start)), d.syncStatsStateDone, pending)
 				}
 			})
 		}
diff --git a/vendor/github.com/ethereum/go-ethereum/eth/filters/api.go b/vendor/github.com/ethereum/go-ethereum/eth/filters/api.go
index 4ba3fb1f2..5da25fea1 100644
--- a/vendor/github.com/ethereum/go-ethereum/eth/filters/api.go
+++ b/vendor/github.com/ethereum/go-ethereum/eth/filters/api.go
@@ -31,7 +31,6 @@ import (
 	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/ethdb"
 	"github.com/ethereum/go-ethereum/event"
-	"github.com/ethereum/go-ethereum/internal/ethapi"
 	"github.com/ethereum/go-ethereum/rpc"
 )
 
@@ -53,7 +52,8 @@ type filter struct {
 // PublicFilterAPI offers support to create and manage filters. This will allow external clients to retrieve various
 // information related to the Ethereum protocol such als blocks, transactions and logs.
 type PublicFilterAPI struct {
-	apiBackend ethapi.Backend
+	backend   Backend
+	useMipMap bool
 	mux       *event.TypeMux
 	quit      chan struct{}
 	chainDb   ethdb.Database
@@ -63,13 +63,14 @@ type PublicFilterAPI struct {
 }
 
 // NewPublicFilterAPI returns a new PublicFilterAPI instance.
-func NewPublicFilterAPI(apiBackend ethapi.Backend) *PublicFilterAPI {
+func NewPublicFilterAPI(backend Backend, useMipMap bool) *PublicFilterAPI {
 	api := &PublicFilterAPI{
-		apiBackend:       apiBackend,
-		mux:              apiBackend.EventMux(),
-		chainDb:          apiBackend.ChainDb(),
-		events:  	NewEventSystem(apiBackend.EventMux()),
-		filters: 	make(map[rpc.ID]*filter),
+		backend:   backend,
+		useMipMap: useMipMap,
+		mux:       backend.EventMux(),
+		chainDb:   backend.ChainDb(),
+		events:    NewEventSystem(backend.EventMux()),
+		filters:   make(map[rpc.ID]*filter),
 	}
 
 	go api.timeoutLoop()
@@ -325,7 +326,7 @@ func (api *PublicFilterAPI) GetLogs(ctx context.Context, crit FilterCriteria) ([
 		crit.ToBlock = big.NewInt(rpc.LatestBlockNumber.Int64())
 	}
 
-	filter := New(api.apiBackend)
+	filter := New(api.backend, api.useMipMap)
 	filter.SetBeginBlock(crit.FromBlock.Int64())
 	filter.SetEndBlock(crit.ToBlock.Int64())
 	filter.SetAddresses(crit.Addresses)
@@ -365,7 +366,7 @@ func (api *PublicFilterAPI) GetFilterLogs(ctx context.Context, id rpc.ID) ([]Log
 		return []Log{}, nil
 	}
 
-	filter := New(api.apiBackend)
+	filter := New(api.backend, api.useMipMap)
 	filter.SetBeginBlock(f.crit.FromBlock.Int64())
 	filter.SetEndBlock(f.crit.ToBlock.Int64())
 	filter.SetAddresses(f.crit.Addresses)
@@ -541,4 +542,3 @@ func (args *FilterCriteria) UnmarshalJSON(data []byte) error {
 
 	return nil
 }
-
diff --git a/vendor/github.com/ethereum/go-ethereum/eth/filters/filter.go b/vendor/github.com/ethereum/go-ethereum/eth/filters/filter.go
index 1e6a6f6f9..6aa05513b 100644
--- a/vendor/github.com/ethereum/go-ethereum/eth/filters/filter.go
+++ b/vendor/github.com/ethereum/go-ethereum/eth/filters/filter.go
@@ -17,21 +17,29 @@
 package filters
 
 import (
-	//	"math"
+	"math"
 	"time"
 
 	"github.com/ethereum/go-ethereum/common"
-	//	"github.com/ethereum/go-ethereum/core"
+	"github.com/ethereum/go-ethereum/core"
 	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/ethdb"
-	"github.com/ethereum/go-ethereum/internal/ethapi"
+	"github.com/ethereum/go-ethereum/event"
 	"github.com/ethereum/go-ethereum/rpc"
 	"golang.org/x/net/context"
 )
 
+type Backend interface {
+	ChainDb() ethdb.Database
+	EventMux() *event.TypeMux
+	HeaderByNumber(ctx context.Context, blockNr rpc.BlockNumber) (*types.Header, error)
+	GetReceipts(ctx context.Context, blockHash common.Hash) (types.Receipts, error)
+}
+
 // Filter can be used to retrieve and filter logs
 type Filter struct {
-	apiBackend ethapi.Backend
+	backend   Backend
+	useMipMap bool
 
 	created time.Time
 
@@ -43,10 +51,11 @@ type Filter struct {
 
 // New creates a new filter which uses a bloom filter on blocks to figure out whether
 // a particular block is interesting or not.
-func New(apiBackend ethapi.Backend) *Filter {
+func New(backend Backend, useMipMap bool) *Filter {
 	return &Filter{
-		apiBackend: apiBackend,
-		db:         apiBackend.ChainDb(),
+		backend:   backend,
+		useMipMap: useMipMap,
+		db:        backend.ChainDb(),
 	}
 }
 
@@ -75,7 +84,10 @@ func (f *Filter) SetTopics(topics [][]common.Hash) {
 
 // Run filters logs with the current parameters set
 func (f *Filter) Find(ctx context.Context) ([]Log, error) {
-	head, _ := f.apiBackend.HeaderByNumber(ctx, rpc.LatestBlockNumber)
+	head, _ := f.backend.HeaderByNumber(ctx, rpc.LatestBlockNumber)
+	if head == nil {
+		return nil, nil
+	}
 	headBlockNumber := head.Number.Uint64()
 
 	var beginBlockNo uint64 = uint64(f.begin)
@@ -90,14 +102,13 @@ func (f *Filter) Find(ctx context.Context) ([]Log, error) {
 	// if no addresses are present we can't make use of fast search which
 	// uses the mipmap bloom filters to check for fast inclusion and uses
 	// higher range probability in order to ensure at least a false positive
-	//	if len(self.addresses) == 0 {
-	return f.getLogs(ctx, beginBlockNo, endBlockNo)
-	//	}
-	//	return self.mipFind(beginBlockNo, endBlockNo, 0)
+	if !f.useMipMap || len(f.addresses) == 0 {
+		return f.getLogs(ctx, beginBlockNo, endBlockNo)
+	}
+	return f.mipFind(beginBlockNo, endBlockNo, 0), nil
 }
 
-/*func (self *Filter) mipFind(start, end uint64, depth int) (logs vm.Logs) {
->>>>>>> les: light client protocol and API
+func (f *Filter) mipFind(start, end uint64, depth int) (logs []Log) {
 	level := core.MIPMapLevels[depth]
 	// normalise numerator so we can work in level specific batches and
 	// work with the proper range checks
@@ -112,7 +123,8 @@ func (f *Filter) Find(ctx context.Context) ([]Log, error) {
 				start := uint64(math.Max(float64(num), float64(start)))
 				end := uint64(math.Min(float64(num+level-1), float64(end)))
 				if depth+1 == len(core.MIPMapLevels) {
-					logs = append(logs, f.getLogs(start, end)...)
+					l, _ := f.getLogs(context.Background(), start, end)
+					logs = append(logs, l...)
 				} else {
 					logs = append(logs, f.mipFind(start, end, depth+1)...)
 				}
@@ -125,11 +137,11 @@ func (f *Filter) Find(ctx context.Context) ([]Log, error) {
 	}
 
 	return logs
-}*/
+}
 
 func (f *Filter) getLogs(ctx context.Context, start, end uint64) (logs []Log, err error) {
 	for i := start; i <= end; i++ {
-		header, err := f.apiBackend.HeaderByNumber(ctx, rpc.BlockNumber(i))
+		header, err := f.backend.HeaderByNumber(ctx, rpc.BlockNumber(i))
 		if header == nil || err != nil {
 			return logs, err
 		}
@@ -138,7 +150,7 @@ func (f *Filter) getLogs(ctx context.Context, start, end uint64) (logs []Log, er
 		// current parameters
 		if f.bloomFilter(header.Bloom) {
 			// Get the logs of the block
-			receipts, err := f.apiBackend.GetReceipts(ctx, header.Hash())
+			receipts, err := f.backend.GetReceipts(ctx, header.Hash())
 			if err != nil {
 				return nil, err
 			}
diff --git a/vendor/github.com/ethereum/go-ethereum/eth/handler.go b/vendor/github.com/ethereum/go-ethereum/eth/handler.go
index f4dd3ade8..9d6b1ced2 100644
--- a/vendor/github.com/ethereum/go-ethereum/eth/handler.go
+++ b/vendor/github.com/ethereum/go-ethereum/eth/handler.go
@@ -68,6 +68,7 @@ type ProtocolManager struct {
 	blockchain  *core.BlockChain
 	chaindb     ethdb.Database
 	chainconfig *core.ChainConfig
+	maxPeers    int
 
 	downloader *downloader.Downloader
 	fetcher    *fetcher.Fetcher
@@ -94,7 +95,7 @@ type ProtocolManager struct {
 
 // NewProtocolManager returns a new ethereum sub protocol manager. The Ethereum sub protocol manages peers capable
 // with the ethereum network.
-func NewProtocolManager(config *core.ChainConfig, fastSync bool, networkId int, mux *event.TypeMux, txpool txPool, pow pow.PoW, blockchain *core.BlockChain, chaindb ethdb.Database) (*ProtocolManager, error) {
+func NewProtocolManager(config *core.ChainConfig, fastSync bool, networkId int, maxPeers int, mux *event.TypeMux, txpool txPool, pow pow.PoW, blockchain *core.BlockChain, chaindb ethdb.Database) (*ProtocolManager, error) {
 	// Create the protocol manager with the base fields
 	manager := &ProtocolManager{
 		networkId:   networkId,
@@ -103,6 +104,7 @@ func NewProtocolManager(config *core.ChainConfig, fastSync bool, networkId int,
 		blockchain:  blockchain,
 		chaindb:     chaindb,
 		chainconfig: config,
+		maxPeers:    maxPeers,
 		peers:       newPeerSet(),
 		newPeerCh:   make(chan *peer),
 		noMorePeers: make(chan struct{}),
@@ -253,10 +255,10 @@ func (pm *ProtocolManager) newPeer(pv int, p *p2p.Peer, rw p2p.MsgReadWriter) *p
 // handle is the callback invoked to manage the life cycle of an eth peer. When
 // this function terminates, the peer is disconnected.
 func (pm *ProtocolManager) handle(p *peer) error {
-	if pm.peers.Len() >= 20 {
+	if pm.peers.Len() >= pm.maxPeers {
 		return p2p.DiscTooManyPeers
-	}	
-	
+	}
+
 	glog.V(logger.Debug).Infof("%v: peer connected [%s]", p, p.Name())
 
 	// Execute the Ethereum handshake
@@ -292,7 +294,7 @@ func (pm *ProtocolManager) handle(p *peer) error {
 		}
 		// Start a timer to disconnect if the peer doesn't reply in time
 		p.forkDrop = time.AfterFunc(daoChallengeTimeout, func() {
-			glog.V(logger.Warn).Infof("%v: timed out DAO fork-check, dropping", p)
+			glog.V(logger.Debug).Infof("%v: timed out DAO fork-check, dropping", p)
 			pm.removePeer(p.id)
 		})
 		// Make sure it's cleaned up if the peer dies off
diff --git a/vendor/github.com/ethereum/go-ethereum/internal/debug/flags.go b/vendor/github.com/ethereum/go-ethereum/internal/debug/flags.go
index 9fc5fc4fe..ed17f87c4 100644
--- a/vendor/github.com/ethereum/go-ethereum/internal/debug/flags.go
+++ b/vendor/github.com/ethereum/go-ethereum/internal/debug/flags.go
@@ -52,6 +52,11 @@ var (
 		Usage: "pprof HTTP server listening port",
 		Value: 6060,
 	}
+	pprofAddrFlag = cli.StringFlag{
+		Name: "pprofaddr",
+		Usage: "pprof HTTP server listening interface",
+		Value: "127.0.0.1",
+	}
 	memprofilerateFlag = cli.IntFlag{
 		Name:  "memprofilerate",
 		Usage: "Turn on memory profiling with the given rate",
@@ -74,7 +79,7 @@ var (
 // Flags holds all command-line flags required for debugging.
 var Flags = []cli.Flag{
 	verbosityFlag, vmoduleFlag, backtraceAtFlag,
-	pprofFlag, pprofPortFlag,
+	pprofFlag, pprofAddrFlag, pprofPortFlag,
 	memprofilerateFlag, blockprofilerateFlag, cpuprofileFlag, traceFlag,
 }
 
@@ -101,7 +106,7 @@ func Setup(ctx *cli.Context) error {
 
 	// pprof server
 	if ctx.GlobalBool(pprofFlag.Name) {
-		address := fmt.Sprintf("127.0.0.1:%d", ctx.GlobalInt(pprofPortFlag.Name))
+		address := fmt.Sprintf("%s:%d", ctx.GlobalString(pprofAddrFlag.Name), ctx.GlobalInt(pprofPortFlag.Name))
 		go func() {
 			glog.V(logger.Info).Infof("starting pprof server at http://%s/debug/pprof", address)
 			glog.Errorln(http.ListenAndServe(address, nil))
diff --git a/vendor/github.com/ethereum/go-ethereum/internal/ethapi/api.go b/vendor/github.com/ethereum/go-ethereum/internal/ethapi/api.go
index 21c279d80..601684521 100644
--- a/vendor/github.com/ethereum/go-ethereum/internal/ethapi/api.go
+++ b/vendor/github.com/ethereum/go-ethereum/internal/ethapi/api.go
@@ -614,7 +614,7 @@ func (s *PublicBlockChainAPI) rpcOutputBlock(b *types.Block, inclTx bool, fullTx
 		"gasUsed":          rpc.NewHexNumber(head.GasUsed),
 		"timestamp":        rpc.NewHexNumber(head.Time),
 		"transactionsRoot": head.TxHash,
-		"receiptsRoot":      head.ReceiptHash,
+		"receiptsRoot":     head.ReceiptHash,
 	}
 
 	if inclTx {
@@ -716,6 +716,16 @@ func newRPCTransactionFromBlockIndex(b *types.Block, txIndex int) (*RPCTransacti
 	return nil, nil
 }
 
+// newRPCRawTransactionFromBlockIndex returns the bytes of a transaction given a block and a transaction index.
+func newRPCRawTransactionFromBlockIndex(b *types.Block, txIndex int) (rpc.HexBytes, error) {
+	if txIndex >= 0 && txIndex < len(b.Transactions()) {
+		tx := b.Transactions()[txIndex]
+		return rlp.EncodeToBytes(tx)
+	}
+
+	return nil, nil
+}
+
 // newRPCTransaction returns a transaction that will serialize to the RPC representation.
 func newRPCTransaction(b *types.Block, txHash common.Hash) (*RPCTransaction, error) {
 	for idx, tx := range b.Transactions() {
@@ -801,6 +811,22 @@ func (s *PublicTransactionPoolAPI) GetTransactionByBlockHashAndIndex(ctx context
 	return nil, nil
 }
 
+// GetRawTransactionByBlockNumberAndIndex returns the bytes of the transaction for the given block number and index.
+func (s *PublicTransactionPoolAPI) GetRawTransactionByBlockNumberAndIndex(ctx context.Context, blockNr rpc.BlockNumber, index rpc.HexNumber) (rpc.HexBytes, error) {
+	if block, _ := s.b.BlockByNumber(ctx, blockNr); block != nil {
+		return newRPCRawTransactionFromBlockIndex(block, index.Int())
+	}
+	return nil, nil
+}
+
+// GetRawTransactionByBlockHashAndIndex returns the bytes of the transaction for the given block hash and index.
+func (s *PublicTransactionPoolAPI) GetRawTransactionByBlockHashAndIndex(ctx context.Context, blockHash common.Hash, index rpc.HexNumber) (rpc.HexBytes, error) {
+	if block, _ := s.b.GetBlock(ctx, blockHash); block != nil {
+		return newRPCRawTransactionFromBlockIndex(block, index.Int())
+	}
+	return nil, nil
+}
+
 // GetTransactionCount returns the number of transactions the given address has sent for the given block number
 func (s *PublicTransactionPoolAPI) GetTransactionCount(ctx context.Context, address common.Address, blockNr rpc.BlockNumber) (*rpc.HexNumber, error) {
 	state, _, err := s.b.StateAndHeaderByNumber(ctx, blockNr)
@@ -866,9 +892,23 @@ func (s *PublicTransactionPoolAPI) GetTransactionByHash(ctx context.Context, txH
 	return nil, nil
 }
 
+// GetRawTransactionByHash returns the bytes of the transaction for the given hash.
+func (s *PublicTransactionPoolAPI) GetRawTransactionByHash(ctx context.Context, txHash common.Hash) (rpc.HexBytes, error) {
+	var tx *types.Transaction
+	var err error
+
+	if tx, _, err = getTransaction(s.b.ChainDb(), s.b, txHash); err != nil {
+		glog.V(logger.Debug).Infof("%v\n", err)
+		return nil, nil
+	} else if tx == nil {
+		return nil, nil
+	}
+
+	return rlp.EncodeToBytes(tx)
+}
+
 // GetTransactionReceipt returns the transaction receipt for the given transaction hash.
 func (s *PublicTransactionPoolAPI) GetTransactionReceipt(txHash common.Hash) (map[string]interface{}, error) {
-	//fmt.Println("API GetTransactionReceipt", txHash)
 	receipt := core.GetReceipt(s.b.ChainDb(), txHash)
 	if receipt == nil {
 		glog.V(logger.Debug).Infof("receipt not found for transaction %s", txHash.Hex())
@@ -876,14 +916,12 @@ func (s *PublicTransactionPoolAPI) GetTransactionReceipt(txHash common.Hash) (ma
 	}
 
 	tx, _, err := getTransaction(s.b.ChainDb(), s.b, txHash)
-	//fmt.Println("getTransaction", err)
 	if err != nil {
 		glog.V(logger.Debug).Infof("%v\n", err)
 		return nil, nil
 	}
 
 	txBlock, blockIndex, index, err := getTransactionBlockData(s.b.ChainDb(), txHash)
-	//fmt.Println("getTransactionBlockData", txBlock, blockIndex, index, err)
 	if err != nil {
 		glog.V(logger.Debug).Infof("%v\n", err)
 		return nil, nil
diff --git a/vendor/github.com/ethereum/go-ethereum/internal/web3ext/web3ext.go b/vendor/github.com/ethereum/go-ethereum/internal/web3ext/web3ext.go
index 04b13e483..cbbab0ece 100644
--- a/vendor/github.com/ethereum/go-ethereum/internal/web3ext/web3ext.go
+++ b/vendor/github.com/ethereum/go-ethereum/internal/web3ext/web3ext.go
@@ -468,6 +468,19 @@ web3._extend({
 			call: 'eth_submitTransaction',
 			params: 1,
 			inputFormatter: [web3._extend.formatters.inputTransactionFormatter]
+		}),
+		new web3._extend.Method({
+			name: 'getRawTransaction',
+			call: 'eth_getRawTransactionByHash',
+			params: 1
+		}),
+		new web3._extend.Method({
+			name: 'getRawTransactionFromBlock',
+			call: function(args) {
+				return (web3._extend.utils.isString(args[0]) && args[0].indexOf('0x') === 0) ? 'eth_getRawTransactionByBlockHashAndIndex' : 'eth_getRawTransactionByBlockNumberAndIndex';
+			},
+			params: 2,
+			inputFormatter: [web3._extend.formatters.inputBlockNumberFormatter, web3._extend.utils.toHex]
 		})
 	],
 	properties:
diff --git a/vendor/github.com/ethereum/go-ethereum/les/backend.go b/vendor/github.com/ethereum/go-ethereum/les/backend.go
index efa938c0d..bd44a7509 100644
--- a/vendor/github.com/ethereum/go-ethereum/les/backend.go
+++ b/vendor/github.com/ethereum/go-ethereum/les/backend.go
@@ -144,7 +144,7 @@ func (s *LightEthereum) APIs() []rpc.API {
 		}, {
 			Namespace: "eth",
 			Version:   "1.0",
-			Service:   filters.NewPublicFilterAPI(s.ApiBackend),
+			Service:   filters.NewPublicFilterAPI(s.ApiBackend, false),
 			Public:    true,
 		}, {
 			Namespace: "net",
diff --git a/vendor/github.com/ethereum/go-ethereum/les/peer.go b/vendor/github.com/ethereum/go-ethereum/les/peer.go
index a191eeeff..e5ec3457b 100644
--- a/vendor/github.com/ethereum/go-ethereum/les/peer.go
+++ b/vendor/github.com/ethereum/go-ethereum/les/peer.go
@@ -448,7 +448,6 @@ func (p *peer) Handshake(td *big.Int, head common.Hash, headNum uint64, genesis
 		}
 		p.fcServerParams = params
 		p.fcServer = flowcontrol.NewServerNode(params)
-		p.fcServerParams = params
 		p.fcCosts = MRC.decode()
 	}
 
diff --git a/vendor/github.com/ethereum/go-ethereum/light/lightchain.go b/vendor/github.com/ethereum/go-ethereum/light/lightchain.go
index 88a25ba08..acce41705 100644
--- a/vendor/github.com/ethereum/go-ethereum/light/lightchain.go
+++ b/vendor/github.com/ethereum/go-ethereum/light/lightchain.go
@@ -106,8 +106,8 @@ func NewLightChain(odr OdrBackend, config *core.ChainConfig, pow pow.PoW, mux *e
 		// add trusted CHT
 		if config.DAOForkSupport {
 			WriteTrustedCht(bc.chainDb, TrustedCht{
-				Number: 564,
-				Root:   common.HexToHash("ee31f7fc21f627dc2b8d3ed8fed5b74dbc393d146a67249a656e163148e39016"),
+				Number: 601,
+				Root:   common.HexToHash("7d417d315bb8873c03fad7447bfbb0e92a22afe2937eaf064d3d48077ec1dd87"),
 			})
 		} else {
 			WriteTrustedCht(bc.chainDb, TrustedCht{
@@ -120,8 +120,8 @@ func NewLightChain(odr OdrBackend, config *core.ChainConfig, pow pow.PoW, mux *e
 		if bc.genesisBlock.Hash() == (common.Hash{12, 215, 134, 162, 66, 93, 22, 241, 82, 198, 88, 49, 108, 66, 62, 108, 225, 24, 30, 21, 195, 41, 88, 38, 215, 201, 144, 76, 186, 156, 227, 3}) {
 			// add trusted CHT for testnet
 			WriteTrustedCht(bc.chainDb, TrustedCht{
-				Number: 319,
-				Root:   common.HexToHash("43b679ff9b4918b0b19e6256f20e35877365ec3e20b38e3b2a02cef5606176dc"),
+				Number: 436,
+				Root:   common.HexToHash("97a12df5d04d72bde4b4b840e1018e4f08aee34b7d0bf2c5dbfc052b86fe7439"),
 			})
 			glog.V(logger.Info).Infoln("Added trusted CHT for testnet")
 		} else {
diff --git a/vendor/github.com/ethereum/go-ethereum/light/state.go b/vendor/github.com/ethereum/go-ethereum/light/state.go
index fc7b36221..88f60efbb 100644
--- a/vendor/github.com/ethereum/go-ethereum/light/state.go
+++ b/vendor/github.com/ethereum/go-ethereum/light/state.go
@@ -121,9 +121,9 @@ func (self *LightState) GetState(ctx context.Context, a common.Address, b common
 	return common.Hash{}, err
 }
 
-// IsDeleted returns true if the given account has been marked for deletion
+// HasSuicided returns true if the given account has been marked for deletion
 // or false if the account does not exist
-func (self *LightState) IsDeleted(ctx context.Context, addr common.Address) (bool, error) {
+func (self *LightState) HasSuicided(ctx context.Context, addr common.Address) (bool, error) {
 	stateObject, err := self.GetStateObject(ctx, addr)
 	if err == nil && stateObject != nil {
 		return stateObject.remove, nil
@@ -172,7 +172,7 @@ func (self *LightState) SetState(ctx context.Context, addr common.Address, key c
 }
 
 // Delete marks an account to be removed and clears its balance
-func (self *LightState) Delete(ctx context.Context, addr common.Address) (bool, error) {
+func (self *LightState) Suicide(ctx context.Context, addr common.Address) (bool, error) {
 	stateObject, err := self.GetOrNewStateObject(ctx, addr)
 	if err == nil && stateObject != nil {
 		stateObject.MarkForDeletion()
diff --git a/vendor/github.com/ethereum/go-ethereum/light/trie.go b/vendor/github.com/ethereum/go-ethereum/light/trie.go
index 6de6b4849..c5525358a 100644
--- a/vendor/github.com/ethereum/go-ethereum/light/trie.go
+++ b/vendor/github.com/ethereum/go-ethereum/light/trie.go
@@ -78,7 +78,7 @@ func (t *LightTrie) do(ctx context.Context, fallbackKey []byte, fn func() error)
 func (t *LightTrie) Get(ctx context.Context, key []byte) (res []byte, err error) {
 	err = t.do(ctx, key, func() (err error) {
 		if t.trie == nil {
-			t.trie, err = trie.NewSecure(t.id.Root, t.db)
+			t.trie, err = trie.NewSecure(t.id.Root, t.db, 0)
 		}
 		if err == nil {
 			res, err = t.trie.TryGet(key)
@@ -97,7 +97,7 @@ func (t *LightTrie) Get(ctx context.Context, key []byte) (res []byte, err error)
 func (t *LightTrie) Update(ctx context.Context, key, value []byte) (err error) {
 	err = t.do(ctx, key, func() (err error) {
 		if t.trie == nil {
-			t.trie, err = trie.NewSecure(t.id.Root, t.db)
+			t.trie, err = trie.NewSecure(t.id.Root, t.db, 0)
 		}
 		if err == nil {
 			err = t.trie.TryUpdate(key, value)
@@ -111,7 +111,7 @@ func (t *LightTrie) Update(ctx context.Context, key, value []byte) (err error) {
 func (t *LightTrie) Delete(ctx context.Context, key []byte) (err error) {
 	err = t.do(ctx, key, func() (err error) {
 		if t.trie == nil {
-			t.trie, err = trie.NewSecure(t.id.Root, t.db)
+			t.trie, err = trie.NewSecure(t.id.Root, t.db, 0)
 		}
 		if err == nil {
 			err = t.trie.TryDelete(key)
diff --git a/vendor/github.com/ethereum/go-ethereum/light/vm_env.go b/vendor/github.com/ethereum/go-ethereum/light/vm_env.go
index d18e97b08..0f4b90908 100644
--- a/vendor/github.com/ethereum/go-ethereum/light/vm_env.go
+++ b/vendor/github.com/ethereum/go-ethereum/light/vm_env.go
@@ -204,12 +204,14 @@ func (s *VMState) GetCode(addr common.Address) []byte {
 	return res
 }
 
+// GetCodeHash returns the contract code hash at the given address
 func (s *VMState) GetCodeHash(addr common.Address) common.Hash {
 	res, err := s.state.GetCode(s.ctx, addr)
 	s.errHandler(err)
 	return crypto.Keccak256Hash(res)
 }
 
+// GetCodeSize returns the contract code size at the given address
 func (s *VMState) GetCodeSize(addr common.Address) int {
 	res, err := s.state.GetCode(s.ctx, addr)
 	s.errHandler(err)
@@ -246,9 +248,9 @@ func (s *VMState) SetState(addr common.Address, key common.Hash, value common.Ha
 	s.errHandler(err)
 }
 
-// Delete marks an account to be removed and clears its balance
+// Suicide marks an account to be removed and clears its balance
 func (s *VMState) Suicide(addr common.Address) bool {
-	res, err := s.state.Delete(s.ctx, addr)
+	res, err := s.state.Suicide(s.ctx, addr)
 	s.errHandler(err)
 	return res
 }
@@ -260,10 +262,10 @@ func (s *VMState) Exist(addr common.Address) bool {
 	return res
 }
 
-// IsDeleted returns true if the given account has been marked for deletion
+// HasSuicided returns true if the given account has been marked for deletion
 // or false if the account does not exist
 func (s *VMState) HasSuicided(addr common.Address) bool {
-	res, err := s.state.IsDeleted(s.ctx, addr)
+	res, err := s.state.HasSuicided(s.ctx, addr)
 	s.errHandler(err)
 	return res
 }
diff --git a/vendor/github.com/ethereum/go-ethereum/metrics/metrics.go b/vendor/github.com/ethereum/go-ethereum/metrics/metrics.go
index fcf8b5c32..7f647cd00 100644
--- a/vendor/github.com/ethereum/go-ethereum/metrics/metrics.go
+++ b/vendor/github.com/ethereum/go-ethereum/metrics/metrics.go
@@ -26,6 +26,7 @@ import (
 	"github.com/ethereum/go-ethereum/logger"
 	"github.com/ethereum/go-ethereum/logger/glog"
 	"github.com/rcrowley/go-metrics"
+	"github.com/rcrowley/go-metrics/exp"
 )
 
 // MetricsEnabledFlag is the CLI flag name to use to enable metrics collections.
@@ -44,6 +45,7 @@ func init() {
 			Enabled = true
 		}
 	}
+	exp.Exp(metrics.DefaultRegistry)
 }
 
 // NewMeter create a new metrics Meter, either a real one of a NOP stub depending
diff --git a/vendor/github.com/ethereum/go-ethereum/node/config.go b/vendor/github.com/ethereum/go-ethereum/node/config.go
index 15884a12e..8af9215a0 100644
--- a/vendor/github.com/ethereum/go-ethereum/node/config.go
+++ b/vendor/github.com/ethereum/go-ethereum/node/config.go
@@ -95,12 +95,16 @@ type Config struct {
 	// or not. Disabling is usually useful for protocol debugging (manual topology).
 	NoDiscovery bool
 
+	DiscoveryV5 bool
+
 	// Bootstrap nodes used to establish connectivity with the rest of the network.
 	BootstrapNodes []*discover.Node
 
 	// Network interface address on which the node should listen for inbound peers.
 	ListenAddr string
 
+	ListenAddrV5 string
+
 	// If set to a non-nil value, the given NAT port mapper is used to make the
 	// listening port available to the Internet.
 	NAT nat.Interface
diff --git a/vendor/github.com/ethereum/go-ethereum/node/node.go b/vendor/github.com/ethereum/go-ethereum/node/node.go
index 41c9eb27f..15f43fc6b 100644
--- a/vendor/github.com/ethereum/go-ethereum/node/node.go
+++ b/vendor/github.com/ethereum/go-ethereum/node/node.go
@@ -157,11 +157,13 @@ func (n *Node) Start() error {
 		PrivateKey:      n.config.NodeKey(),
 		Name:            n.config.NodeName(),
 		Discovery:       !n.config.NoDiscovery,
+		DiscoveryV5:     n.config.DiscoveryV5,
 		BootstrapNodes:  n.config.BootstrapNodes,
 		StaticNodes:     n.config.StaticNodes(),
 		TrustedNodes:    n.config.TrusterNodes(),
 		NodeDatabase:    n.config.NodeDB(),
 		ListenAddr:      n.config.ListenAddr,
+		ListenAddrV5:    n.config.ListenAddrV5,
 		NAT:             n.config.NAT,
 		Dialer:          n.config.Dialer,
 		NoDial:          n.config.NoDial,
diff --git a/vendor/github.com/ethereum/go-ethereum/p2p/discv5/crypto.go b/vendor/github.com/ethereum/go-ethereum/p2p/discv5/crypto.go
new file mode 100644
index 000000000..f68d03908
--- /dev/null
+++ b/vendor/github.com/ethereum/go-ethereum/p2p/discv5/crypto.go
@@ -0,0 +1,31 @@
+// Copyright 2015 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package discv5
+
+import (
+	//"github.com/btcsuite/btcd/btcec"
+	"github.com/ethereum/go-ethereum/crypto/secp256k1"
+)
+
+func S256() *secp256k1.BitCurve {
+	return secp256k1.S256()
+}
+
+// This version should be used for NaCl compilation
+/*func S256() *btcec.KoblitzCurve {
+	return S256()
+}*/
diff --git a/vendor/github.com/ethereum/go-ethereum/p2p/discv5/database.go b/vendor/github.com/ethereum/go-ethereum/p2p/discv5/database.go
new file mode 100644
index 000000000..7c47c27fd
--- /dev/null
+++ b/vendor/github.com/ethereum/go-ethereum/p2p/discv5/database.go
@@ -0,0 +1,413 @@
+// Copyright 2015 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+// Contains the node database, storing previously seen nodes and any collected
+// metadata about them for QoS purposes.
+
+package discv5
+
+import (
+	"bytes"
+	"crypto/rand"
+	"encoding/binary"
+	"os"
+	"sync"
+	"time"
+
+	"github.com/ethereum/go-ethereum/crypto"
+	"github.com/ethereum/go-ethereum/logger"
+	"github.com/ethereum/go-ethereum/logger/glog"
+	"github.com/ethereum/go-ethereum/rlp"
+	"github.com/syndtr/goleveldb/leveldb"
+	"github.com/syndtr/goleveldb/leveldb/errors"
+	"github.com/syndtr/goleveldb/leveldb/iterator"
+	"github.com/syndtr/goleveldb/leveldb/opt"
+	"github.com/syndtr/goleveldb/leveldb/storage"
+	"github.com/syndtr/goleveldb/leveldb/util"
+)
+
+var (
+	nodeDBNilNodeID      = NodeID{}       // Special node ID to use as a nil element.
+	nodeDBNodeExpiration = 24 * time.Hour // Time after which an unseen node should be dropped.
+	nodeDBCleanupCycle   = time.Hour      // Time period for running the expiration task.
+)
+
+// nodeDB stores all nodes we know about.
+type nodeDB struct {
+	lvl    *leveldb.DB   // Interface to the database itself
+	self   NodeID        // Own node id to prevent adding it into the database
+	runner sync.Once     // Ensures we can start at most one expirer
+	quit   chan struct{} // Channel to signal the expiring thread to stop
+}
+
+// Schema layout for the node database
+var (
+	nodeDBVersionKey = []byte("version") // Version of the database to flush if changes
+	nodeDBItemPrefix = []byte("n:")      // Identifier to prefix node entries with
+
+	nodeDBDiscoverRoot          = ":discover"
+	nodeDBDiscoverPing          = nodeDBDiscoverRoot + ":lastping"
+	nodeDBDiscoverPong          = nodeDBDiscoverRoot + ":lastpong"
+	nodeDBDiscoverFindFails     = nodeDBDiscoverRoot + ":findfail"
+	nodeDBDiscoverLocalEndpoint = nodeDBDiscoverRoot + ":localendpoint"
+	nodeDBTopicRegTickets       = ":tickets"
+)
+
+// newNodeDB creates a new node database for storing and retrieving infos about
+// known peers in the network. If no path is given, an in-memory, temporary
+// database is constructed.
+func newNodeDB(path string, version int, self NodeID) (*nodeDB, error) {
+	if path == "" {
+		return newMemoryNodeDB(self)
+	}
+	return newPersistentNodeDB(path, version, self)
+}
+
+// newMemoryNodeDB creates a new in-memory node database without a persistent
+// backend.
+func newMemoryNodeDB(self NodeID) (*nodeDB, error) {
+	db, err := leveldb.Open(storage.NewMemStorage(), nil)
+	if err != nil {
+		return nil, err
+	}
+	return &nodeDB{
+		lvl:  db,
+		self: self,
+		quit: make(chan struct{}),
+	}, nil
+}
+
+// newPersistentNodeDB creates/opens a leveldb backed persistent node database,
+// also flushing its contents in case of a version mismatch.
+func newPersistentNodeDB(path string, version int, self NodeID) (*nodeDB, error) {
+	opts := &opt.Options{OpenFilesCacheCapacity: 5}
+	db, err := leveldb.OpenFile(path, opts)
+	if _, iscorrupted := err.(*errors.ErrCorrupted); iscorrupted {
+		db, err = leveldb.RecoverFile(path, nil)
+	}
+	if err != nil {
+		return nil, err
+	}
+	// The nodes contained in the cache correspond to a certain protocol version.
+	// Flush all nodes if the version doesn't match.
+	currentVer := make([]byte, binary.MaxVarintLen64)
+	currentVer = currentVer[:binary.PutVarint(currentVer, int64(version))]
+
+	blob, err := db.Get(nodeDBVersionKey, nil)
+	switch err {
+	case leveldb.ErrNotFound:
+		// Version not found (i.e. empty cache), insert it
+		if err := db.Put(nodeDBVersionKey, currentVer, nil); err != nil {
+			db.Close()
+			return nil, err
+		}
+
+	case nil:
+		// Version present, flush if different
+		if !bytes.Equal(blob, currentVer) {
+			db.Close()
+			if err = os.RemoveAll(path); err != nil {
+				return nil, err
+			}
+			return newPersistentNodeDB(path, version, self)
+		}
+	}
+	return &nodeDB{
+		lvl:  db,
+		self: self,
+		quit: make(chan struct{}),
+	}, nil
+}
+
+// makeKey generates the leveldb key-blob from a node id and its particular
+// field of interest.
+func makeKey(id NodeID, field string) []byte {
+	if bytes.Equal(id[:], nodeDBNilNodeID[:]) {
+		return []byte(field)
+	}
+	return append(nodeDBItemPrefix, append(id[:], field...)...)
+}
+
+// splitKey tries to split a database key into a node id and a field part.
+func splitKey(key []byte) (id NodeID, field string) {
+	// If the key is not of a node, return it plainly
+	if !bytes.HasPrefix(key, nodeDBItemPrefix) {
+		return NodeID{}, string(key)
+	}
+	// Otherwise split the id and field
+	item := key[len(nodeDBItemPrefix):]
+	copy(id[:], item[:len(id)])
+	field = string(item[len(id):])
+
+	return id, field
+}
+
+// fetchInt64 retrieves an integer instance associated with a particular
+// database key.
+func (db *nodeDB) fetchInt64(key []byte) int64 {
+	blob, err := db.lvl.Get(key, nil)
+	if err != nil {
+		return 0
+	}
+	val, read := binary.Varint(blob)
+	if read <= 0 {
+		return 0
+	}
+	return val
+}
+
+// storeInt64 update a specific database entry to the current time instance as a
+// unix timestamp.
+func (db *nodeDB) storeInt64(key []byte, n int64) error {
+	blob := make([]byte, binary.MaxVarintLen64)
+	blob = blob[:binary.PutVarint(blob, n)]
+	return db.lvl.Put(key, blob, nil)
+}
+
+func (db *nodeDB) storeRLP(key []byte, val interface{}) error {
+	blob, err := rlp.EncodeToBytes(val)
+	if err != nil {
+		return err
+	}
+	return db.lvl.Put(key, blob, nil)
+}
+
+func (db *nodeDB) fetchRLP(key []byte, val interface{}) error {
+	blob, err := db.lvl.Get(key, nil)
+	if err != nil {
+		return err
+	}
+	err = rlp.DecodeBytes(blob, val)
+	if err != nil {
+		glog.V(logger.Warn).Infof("key %x (%T) %v", key, val, err)
+	}
+	return err
+}
+
+// node retrieves a node with a given id from the database.
+func (db *nodeDB) node(id NodeID) *Node {
+	var node Node
+	if err := db.fetchRLP(makeKey(id, nodeDBDiscoverRoot), &node); err != nil {
+		return nil
+	}
+	node.sha = crypto.Keccak256Hash(node.ID[:])
+	return &node
+}
+
+// updateNode inserts - potentially overwriting - a node into the peer database.
+func (db *nodeDB) updateNode(node *Node) error {
+	return db.storeRLP(makeKey(node.ID, nodeDBDiscoverRoot), node)
+}
+
+// deleteNode deletes all information/keys associated with a node.
+func (db *nodeDB) deleteNode(id NodeID) error {
+	deleter := db.lvl.NewIterator(util.BytesPrefix(makeKey(id, "")), nil)
+	for deleter.Next() {
+		if err := db.lvl.Delete(deleter.Key(), nil); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+// ensureExpirer is a small helper method ensuring that the data expiration
+// mechanism is running. If the expiration goroutine is already running, this
+// method simply returns.
+//
+// The goal is to start the data evacuation only after the network successfully
+// bootstrapped itself (to prevent dumping potentially useful seed nodes). Since
+// it would require significant overhead to exactly trace the first successful
+// convergence, it's simpler to "ensure" the correct state when an appropriate
+// condition occurs (i.e. a successful bonding), and discard further events.
+func (db *nodeDB) ensureExpirer() {
+	db.runner.Do(func() { go db.expirer() })
+}
+
+// expirer should be started in a go routine, and is responsible for looping ad
+// infinitum and dropping stale data from the database.
+func (db *nodeDB) expirer() {
+	tick := time.Tick(nodeDBCleanupCycle)
+	for {
+		select {
+		case <-tick:
+			if err := db.expireNodes(); err != nil {
+				glog.V(logger.Error).Infof("Failed to expire nodedb items: %v", err)
+			}
+
+		case <-db.quit:
+			return
+		}
+	}
+}
+
+// expireNodes iterates over the database and deletes all nodes that have not
+// been seen (i.e. received a pong from) for some allotted time.
+func (db *nodeDB) expireNodes() error {
+	threshold := time.Now().Add(-nodeDBNodeExpiration)
+
+	// Find discovered nodes that are older than the allowance
+	it := db.lvl.NewIterator(nil, nil)
+	defer it.Release()
+
+	for it.Next() {
+		// Skip the item if not a discovery node
+		id, field := splitKey(it.Key())
+		if field != nodeDBDiscoverRoot {
+			continue
+		}
+		// Skip the node if not expired yet (and not self)
+		if bytes.Compare(id[:], db.self[:]) != 0 {
+			if seen := db.lastPong(id); seen.After(threshold) {
+				continue
+			}
+		}
+		// Otherwise delete all associated information
+		db.deleteNode(id)
+	}
+	return nil
+}
+
+// lastPing retrieves the time of the last ping packet send to a remote node,
+// requesting binding.
+func (db *nodeDB) lastPing(id NodeID) time.Time {
+	return time.Unix(db.fetchInt64(makeKey(id, nodeDBDiscoverPing)), 0)
+}
+
+// updateLastPing updates the last time we tried contacting a remote node.
+func (db *nodeDB) updateLastPing(id NodeID, instance time.Time) error {
+	return db.storeInt64(makeKey(id, nodeDBDiscoverPing), instance.Unix())
+}
+
+// lastPong retrieves the time of the last successful contact from remote node.
+func (db *nodeDB) lastPong(id NodeID) time.Time {
+	return time.Unix(db.fetchInt64(makeKey(id, nodeDBDiscoverPong)), 0)
+}
+
+// updateLastPong updates the last time a remote node successfully contacted.
+func (db *nodeDB) updateLastPong(id NodeID, instance time.Time) error {
+	return db.storeInt64(makeKey(id, nodeDBDiscoverPong), instance.Unix())
+}
+
+// findFails retrieves the number of findnode failures since bonding.
+func (db *nodeDB) findFails(id NodeID) int {
+	return int(db.fetchInt64(makeKey(id, nodeDBDiscoverFindFails)))
+}
+
+// updateFindFails updates the number of findnode failures since bonding.
+func (db *nodeDB) updateFindFails(id NodeID, fails int) error {
+	return db.storeInt64(makeKey(id, nodeDBDiscoverFindFails), int64(fails))
+}
+
+// localEndpoint returns the last local endpoint communicated to the
+// given remote node.
+func (db *nodeDB) localEndpoint(id NodeID) *rpcEndpoint {
+	var ep rpcEndpoint
+	if err := db.fetchRLP(makeKey(id, nodeDBDiscoverLocalEndpoint), &ep); err != nil {
+		return nil
+	}
+	return &ep
+}
+
+func (db *nodeDB) updateLocalEndpoint(id NodeID, ep rpcEndpoint) error {
+	return db.storeRLP(makeKey(id, nodeDBDiscoverLocalEndpoint), &ep)
+}
+
+// querySeeds retrieves random nodes to be used as potential seed nodes
+// for bootstrapping.
+func (db *nodeDB) querySeeds(n int, maxAge time.Duration) []*Node {
+	var (
+		now   = time.Now()
+		nodes = make([]*Node, 0, n)
+		it    = db.lvl.NewIterator(nil, nil)
+		id    NodeID
+	)
+	defer it.Release()
+
+seek:
+	for seeks := 0; len(nodes) < n && seeks < n*5; seeks++ {
+		// Seek to a random entry. The first byte is incremented by a
+		// random amount each time in order to increase the likelihood
+		// of hitting all existing nodes in very small databases.
+		ctr := id[0]
+		rand.Read(id[:])
+		id[0] = ctr + id[0]%16
+		it.Seek(makeKey(id, nodeDBDiscoverRoot))
+
+		n := nextNode(it)
+		if n == nil {
+			id[0] = 0
+			continue seek // iterator exhausted
+		}
+		if n.ID == db.self {
+			continue seek
+		}
+		if now.Sub(db.lastPong(n.ID)) > maxAge {
+			continue seek
+		}
+		for i := range nodes {
+			if nodes[i].ID == n.ID {
+				continue seek // duplicate
+			}
+		}
+		nodes = append(nodes, n)
+	}
+	return nodes
+}
+
+func (db *nodeDB) fetchTopicRegTickets(id NodeID) (issued, used uint32) {
+	key := makeKey(id, nodeDBTopicRegTickets)
+	blob, _ := db.lvl.Get(key, nil)
+	if len(blob) != 8 {
+		return 0, 0
+	}
+	issued = binary.BigEndian.Uint32(blob[0:4])
+	used = binary.BigEndian.Uint32(blob[4:8])
+	return
+}
+
+func (db *nodeDB) updateTopicRegTickets(id NodeID, issued, used uint32) error {
+	key := makeKey(id, nodeDBTopicRegTickets)
+	blob := make([]byte, 8)
+	binary.BigEndian.PutUint32(blob[0:4], issued)
+	binary.BigEndian.PutUint32(blob[4:8], used)
+	return db.lvl.Put(key, blob, nil)
+}
+
+// reads the next node record from the iterator, skipping over other
+// database entries.
+func nextNode(it iterator.Iterator) *Node {
+	for end := false; !end; end = !it.Next() {
+		id, field := splitKey(it.Key())
+		if field != nodeDBDiscoverRoot {
+			continue
+		}
+		var n Node
+		if err := rlp.DecodeBytes(it.Value(), &n); err != nil {
+			if glog.V(logger.Warn) {
+				glog.Errorf("invalid node %x: %v", id, err)
+			}
+			continue
+		}
+		return &n
+	}
+	return nil
+}
+
+// close flushes and closes the database files.
+func (db *nodeDB) close() {
+	close(db.quit)
+	db.lvl.Close()
+}
diff --git a/vendor/github.com/ethereum/go-ethereum/p2p/discv5/net.go b/vendor/github.com/ethereum/go-ethereum/p2p/discv5/net.go
new file mode 100644
index 000000000..f251f53d3
--- /dev/null
+++ b/vendor/github.com/ethereum/go-ethereum/p2p/discv5/net.go
@@ -0,0 +1,1130 @@
+// Copyright 2016 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package discv5
+
+import (
+	"bytes"
+	"crypto/ecdsa"
+	"errors"
+	"fmt"
+	"net"
+	"time"
+
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/crypto"
+	"github.com/ethereum/go-ethereum/crypto/sha3"
+	"github.com/ethereum/go-ethereum/logger"
+	"github.com/ethereum/go-ethereum/logger/glog"
+	"github.com/ethereum/go-ethereum/p2p/nat"
+	"github.com/ethereum/go-ethereum/rlp"
+)
+
+var (
+	errInvalidEvent = errors.New("invalid in current state")
+	errNoQuery      = errors.New("no pending query")
+	errWrongAddress = errors.New("unknown sender address")
+)
+
+const (
+	autoRefreshInterval = 1 * time.Hour
+	seedCount           = 30
+	seedMaxAge          = 5 * 24 * time.Hour
+)
+
+const testTopic = "foo"
+
+const (
+	printDebugLogs   = false
+	printTestImgLogs = false
+)
+
+func debugLog(s string) {
+	if printDebugLogs {
+		fmt.Println(s)
+	}
+}
+
+// BootNodes are the enode URLs of the P2P bootstrap nodes for the experimental RLPx v5 "Topic Discovery" network
+// warning: local bootnodes for testing!!!
+var BootNodes = []*Node{
+	MustParseNode("enode://fcb7ff7a1437465711900bebc8831b6814d9f3176f3745e8549808af897ede4b51f8e32b52caf1a1c4aee90dc14f2aaeebf8b099f5d19245fd00ab160f59b9c8@127.0.0.1:30001"),
+	MustParseNode("enode://9ec7e836e3eff84c5f51b169d8bd26a90e9c0a1c5a5b01125722fbcc7808803451fdde5c31e0fbf32fa730e11bef3a4ec35c751bd896a3db601155c1313d48a2@127.0.0.1:30002"),
+	MustParseNode("enode://1949788c417a52653b438a33a2b08a70dc495b24c83d0ae533be13b1c7da0af0159bd0b50823fee4a1bc8f24f81e23435fe167df972256968d881f98f1eeb5de@127.0.0.1:30003"),
+	MustParseNode("enode://2a09e932145093688ce0fe885256dfac432402a5546c5b467afe988e205bbaf1a5793f4b625638ba5ba214549965aaacf4881201a82f92bfbaf37e40e7fe7132@127.0.0.1:30004"),
+	MustParseNode("enode://fc3d5a1696c48e02a45a78a6e94554f4292265de3c7461dd2b27ec664b09a23613c6f6be9fe7ab18f4788390abd592c272d549c583af6e92b5b8254f335d71bc@127.0.0.1:30005"),
+}
+
+// Network manages the table and all protocol interaction.
+type Network struct {
+	db   *nodeDB // database of known nodes
+	conn transport
+
+	closed           chan struct{}          // closed when loop is done
+	closeReq         chan struct{}          // 'request to close'
+	refreshReq       chan []*Node           // lookups ask for refresh on this channel
+	refreshResp      chan (<-chan struct{}) // ...and get the channel to block on from this one
+	read             chan ingressPacket     // ingress packets arrive here
+	timeout          chan timeoutEvent
+	queryReq         chan *findnodeQuery // lookups submit findnode queries on this channel
+	tableOpReq       chan func()
+	tableOpResp      chan struct{}
+	topicRegisterReq chan topicRegisterReq
+
+	// State of the main loop.
+	tab           *Table
+	topictab      *topicTable
+	ticketStore   *ticketStore
+	nursery       []*Node
+	nodes         map[NodeID]*Node // tracks active nodes with state != known
+	timeoutTimers map[timeoutEvent]*time.Timer
+
+	// Revalidation queues.
+	// Nodes put on these queues will be pinged eventually.
+	slowRevalidateQueue []*Node
+	fastRevalidateQueue []*Node
+
+	// Buffers for state transition.
+	sendBuf []*ingressPacket
+}
+
+// transport is implemented by the UDP transport.
+// it is an interface so we can test without opening lots of UDP
+// sockets and without generating a private key.
+type transport interface {
+	sendPing(remote *Node, remoteAddr *net.UDPAddr, topics []Topic) (hash []byte)
+	sendNeighbours(remote *Node, nodes []*Node)
+	sendFindnodeHash(remote *Node, target common.Hash)
+	sendTopicRegister(remote *Node, topics []Topic, topicIdx int, pong []byte)
+	sendTopicNodes(remote *Node, queryHash common.Hash, nodes []*Node)
+
+	send(remote *Node, ptype nodeEvent, p interface{})
+
+	localAddr() *net.UDPAddr
+	Close()
+}
+
+type findnodeQuery struct {
+	remote   *Node
+	target   common.Hash
+	reply    chan<- []*Node
+	nresults int // counter for received nodes
+}
+
+type topicRegisterReq struct {
+	add   bool
+	topic Topic
+}
+
+type timeoutEvent struct {
+	ev   nodeEvent
+	node *Node
+}
+
+func newNetwork(conn transport, ourPubkey ecdsa.PublicKey, natm nat.Interface, dbPath string) (*Network, error) {
+	ourID := PubkeyID(&ourPubkey)
+
+	var db *nodeDB
+	if dbPath != "<no database>" {
+		var err error
+		if db, err = newNodeDB(dbPath, Version, ourID); err != nil {
+			return nil, err
+		}
+	}
+
+	tab := newTable(ourID, conn.localAddr())
+	net := &Network{
+		db:               db,
+		conn:             conn,
+		tab:              tab,
+		topictab:         newTopicTable(db, tab.self),
+		ticketStore:      newTicketStore(),
+		refreshReq:       make(chan []*Node),
+		refreshResp:      make(chan (<-chan struct{})),
+		closed:           make(chan struct{}),
+		closeReq:         make(chan struct{}),
+		read:             make(chan ingressPacket, 100),
+		timeout:          make(chan timeoutEvent),
+		timeoutTimers:    make(map[timeoutEvent]*time.Timer),
+		tableOpReq:       make(chan func()),
+		tableOpResp:      make(chan struct{}),
+		queryReq:         make(chan *findnodeQuery),
+		topicRegisterReq: make(chan topicRegisterReq),
+		nodes:            make(map[NodeID]*Node),
+	}
+	go net.loop()
+	return net, nil
+}
+
+// Close terminates the network listener and flushes the node database.
+func (net *Network) Close() {
+	net.conn.Close()
+	select {
+	case <-net.closed:
+	case net.closeReq <- struct{}{}:
+		<-net.closed
+	}
+}
+
+// Self returns the local node.
+// The returned node should not be modified by the caller.
+func (net *Network) Self() *Node {
+	return net.tab.self
+}
+
+// ReadRandomNodes fills the given slice with random nodes from the
+// table. It will not write the same node more than once. The nodes in
+// the slice are copies and can be modified by the caller.
+func (net *Network) ReadRandomNodes(buf []*Node) (n int) {
+	net.reqTableOp(func() { n = net.tab.readRandomNodes(buf) })
+	return n
+}
+
+// SetFallbackNodes sets the initial points of contact. These nodes
+// are used to connect to the network if the table is empty and there
+// are no known nodes in the database.
+func (net *Network) SetFallbackNodes(nodes []*Node) error {
+	nursery := make([]*Node, 0, len(nodes))
+	for _, n := range nodes {
+		if err := n.validateComplete(); err != nil {
+			return fmt.Errorf("bad bootstrap/fallback node %q (%v)", n, err)
+		}
+		// Recompute cpy.sha because the node might not have been
+		// created by NewNode or ParseNode.
+		cpy := *n
+		cpy.sha = crypto.Keccak256Hash(n.ID[:])
+		nursery = append(nursery, &cpy)
+	}
+	net.reqRefresh(nursery)
+	return nil
+}
+
+// Resolve searches for a specific node with the given ID.
+// It returns nil if the node could not be found.
+func (net *Network) Resolve(targetID NodeID) *Node {
+	result := net.lookup(crypto.Keccak256Hash(targetID[:]), true)
+	for _, n := range result {
+		if n.ID == targetID {
+			return n
+		}
+	}
+	return nil
+}
+
+// Lookup performs a network search for nodes close
+// to the given target. It approaches the target by querying
+// nodes that are closer to it on each iteration.
+// The given target does not need to be an actual node
+// identifier.
+//
+// The local node may be included in the result.
+func (net *Network) Lookup(targetID NodeID) []*Node {
+	return net.lookup(crypto.Keccak256Hash(targetID[:]), false)
+}
+
+func (net *Network) lookup(target common.Hash, stopOnMatch bool) []*Node {
+	var (
+		asked          = make(map[NodeID]bool)
+		seen           = make(map[NodeID]bool)
+		reply          = make(chan []*Node, alpha)
+		result         = nodesByDistance{target: target}
+		pendingQueries = 0
+	)
+	// Get initial answers from the local node.
+	result.push(net.tab.self, bucketSize)
+	for {
+		// Ask the α closest nodes that we haven't asked yet.
+		for i := 0; i < len(result.entries) && pendingQueries < alpha; i++ {
+			n := result.entries[i]
+			if !asked[n.ID] {
+				asked[n.ID] = true
+				pendingQueries++
+				net.reqQueryFindnode(n, target, reply)
+			}
+		}
+		if pendingQueries == 0 {
+			// We have asked all closest nodes, stop the search.
+			break
+		}
+		// Wait for the next reply.
+		for _, n := range <-reply {
+			if n != nil && !seen[n.ID] {
+				seen[n.ID] = true
+				result.push(n, bucketSize)
+				if stopOnMatch && n.sha == target {
+					return result.entries
+				}
+			}
+		}
+		pendingQueries--
+	}
+	return result.entries
+}
+
+func (net *Network) RegisterTopic(topic Topic, stop <-chan struct{}) {
+	select {
+	case net.topicRegisterReq <- topicRegisterReq{true, topic}:
+	case <-net.closed:
+		return
+	}
+	select {
+	case <-net.closed:
+	case <-stop:
+		select {
+		case net.topicRegisterReq <- topicRegisterReq{false, topic}:
+		case <-net.closed:
+		}
+	}
+}
+
+func (net *Network) reqRefresh(nursery []*Node) <-chan struct{} {
+	select {
+	case net.refreshReq <- nursery:
+		return <-net.refreshResp
+	case <-net.closed:
+		return net.closed
+	}
+}
+
+func (net *Network) reqQueryFindnode(n *Node, target common.Hash, reply chan []*Node) bool {
+	q := &findnodeQuery{remote: n, target: target, reply: reply}
+	select {
+	case net.queryReq <- q:
+		return true
+	case <-net.closed:
+		return false
+	}
+}
+
+func (net *Network) reqReadPacket(pkt ingressPacket) {
+	select {
+	case net.read <- pkt:
+	case <-net.closed:
+	}
+}
+
+func (net *Network) reqTableOp(f func()) (called bool) {
+	select {
+	case net.tableOpReq <- f:
+		<-net.tableOpResp
+		return true
+	case <-net.closed:
+		return false
+	}
+}
+
+// TODO: external address handling.
+
+func (net *Network) loop() {
+	var (
+		refreshTimer = time.NewTicker(autoRefreshInterval)
+		refreshDone  chan struct{} // closed when the 'refresh' lookup has ended
+	)
+
+	// Tracking the next ticket to register.
+	var (
+		nextTicket        *ticketRef
+		nextRegisterTimer *time.Timer
+		nextRegisterTime  <-chan time.Time
+	)
+	defer func() {
+		if nextRegisterTimer != nil {
+			nextRegisterTimer.Stop()
+		}
+	}()
+	resetNextTicket := func() {
+		t, timeout := net.ticketStore.nextFilteredTicket()
+		if t != nextTicket {
+			nextTicket = t
+			if nextRegisterTimer != nil {
+				nextRegisterTimer.Stop()
+				nextRegisterTime = nil
+			}
+			if t != nil {
+				nextRegisterTimer = time.NewTimer(timeout)
+				nextRegisterTime = nextRegisterTimer.C
+			}
+		}
+	}
+
+	// Tracking registration lookups.
+	var (
+		topicRegisterLookupTarget lookupInfo
+		topicRegisterLookupDone   chan []*Node
+		topicRegisterLookupTick   = time.NewTimer(0)
+	)
+	<-topicRegisterLookupTick.C
+
+	statsDump := time.NewTicker(10 * time.Second)
+
+loop:
+	for {
+		resetNextTicket()
+
+		select {
+		case <-net.closeReq:
+			debugLog("<-net.closeReq")
+			break loop
+
+		// Ingress packet handling.
+		case pkt := <-net.read:
+			debugLog("<-net.read")
+			n := net.internNode(&pkt)
+			prestate := n.state
+			status := "ok"
+			if err := net.handle(n, pkt.ev, &pkt); err != nil {
+				status = err.Error()
+			}
+			if glog.V(logger.Detail) {
+				glog.Infof("<<< (%d) %v from %x@%v: %v -> %v (%v)",
+					net.tab.count, pkt.ev, pkt.remoteID[:8], pkt.remoteAddr, prestate, n.state, status)
+			}
+			// TODO: persist state if n.state goes >= known, delete if it goes <= known
+
+		// State transition timeouts.
+		case timeout := <-net.timeout:
+			debugLog("<-net.timeout")
+			if net.timeoutTimers[timeout] == nil {
+				// Stale timer (was aborted).
+				continue
+			}
+			delete(net.timeoutTimers, timeout)
+			prestate := timeout.node.state
+			status := "ok"
+			if err := net.handle(timeout.node, timeout.ev, nil); err != nil {
+				status = err.Error()
+			}
+			if glog.V(logger.Detail) {
+				glog.Infof("--- (%d) %v for %x@%v: %v -> %v (%v)",
+					net.tab.count, timeout.ev, timeout.node.ID[:8], timeout.node.addr(), prestate, timeout.node.state, status)
+			}
+
+		// Querying.
+		case q := <-net.queryReq:
+			debugLog("<-net.queryReq")
+			if !q.start(net) {
+				q.remote.deferQuery(q)
+			}
+
+		// Interacting with the table.
+		case f := <-net.tableOpReq:
+			debugLog("<-net.tableOpReq")
+			f()
+			net.tableOpResp <- struct{}{}
+
+		// Topic registration stuff.
+		case req := <-net.topicRegisterReq:
+			debugLog("<-net.topicRegisterReq")
+			if !req.add {
+				net.ticketStore.removeRegisterTopic(req.topic)
+				continue
+			}
+			net.ticketStore.addTopic(req.topic, true)
+			// If we're currently waiting idle (nothing to look up), give the ticket store a
+			// chance to start it sooner. This should speed up convergence of the radius
+			// determination for new topics.
+			// if topicRegisterLookupDone == nil {
+			if topicRegisterLookupTarget.target == (common.Hash{}) {
+				debugLog("topicRegisterLookupTarget == null")
+				if topicRegisterLookupTick.Stop() {
+					<-topicRegisterLookupTick.C
+				}
+				target, delay := net.ticketStore.nextRegisterLookup()
+				topicRegisterLookupTarget = target
+				topicRegisterLookupTick.Reset(delay)
+			}
+
+		case nodes := <-topicRegisterLookupDone:
+			debugLog("<-topicRegisterLookupDone")
+			net.ticketStore.registerLookupDone(topicRegisterLookupTarget, nodes, func(n *Node) []byte {
+				net.ping(n, n.addr())
+				return n.pingEcho
+			})
+			target, delay := net.ticketStore.nextRegisterLookup()
+			topicRegisterLookupTarget = target
+			topicRegisterLookupTick.Reset(delay)
+			topicRegisterLookupDone = nil
+
+		case <-topicRegisterLookupTick.C:
+			debugLog("<-topicRegisterLookupTick")
+			if (topicRegisterLookupTarget.target == common.Hash{}) {
+				target, delay := net.ticketStore.nextRegisterLookup()
+				topicRegisterLookupTarget = target
+				topicRegisterLookupTick.Reset(delay)
+				topicRegisterLookupDone = nil
+			} else {
+				topicRegisterLookupDone = make(chan []*Node)
+				target := topicRegisterLookupTarget.target
+				go func() { topicRegisterLookupDone <- net.lookup(target, false) }()
+			}
+
+		case <-nextRegisterTime:
+			debugLog("<-nextRegisterTime")
+			net.ticketStore.ticketRegistered(*nextTicket)
+			net.conn.sendTopicRegister(nextTicket.t.node, nextTicket.t.topics, nextTicket.idx, nextTicket.t.pong)
+
+		case <-statsDump.C:
+			debugLog("<-statsDump.C")
+			/*r, ok := net.ticketStore.radius[testTopic]
+			if !ok {
+				fmt.Printf("(%x) no radius @ %v\n", net.tab.self.ID[:8], time.Now())
+			} else {
+				topics := len(net.ticketStore.tickets)
+				tickets := len(net.ticketStore.nodes)
+				rad := r.radius / (maxRadius/10000+1)
+				fmt.Printf("(%x) topics:%d radius:%d tickets:%d @ %v\n", net.tab.self.ID[:8], topics, rad, tickets, time.Now())
+			}*/
+
+			tm := monotonicTime()
+			for topic, r := range net.ticketStore.radius {
+				if r.converged {
+					rad := r.radius / (maxRadius/1000000 + 1)
+					if printTestImgLogs {
+						fmt.Printf("*R %d %v %016x %v\n", tm/1000000, topic, net.tab.self.sha[:8], rad)
+						fmt.Printf("*MR %d %v %016x %v\n", tm/1000000, topic, net.tab.self.sha[:8], net.ticketStore.minRadius/(maxRadius/1000000+1))
+					}
+				}
+			}
+			for topic, t := range net.topictab.topics {
+				wp := t.wcl.nextWaitPeriod(tm)
+				if printTestImgLogs {
+					fmt.Printf("*W %d %v %016x %d\n", tm/1000000, topic, net.tab.self.sha[:8], wp/1000000)
+				}
+			}
+
+		// Periodic / lookup-initiated bucket refresh.
+		case <-refreshTimer.C:
+			debugLog("<-refreshTimer.C")
+			// TODO: ideally we would start the refresh timer after
+			// fallback nodes have been set for the first time.
+			if refreshDone == nil {
+				refreshDone = make(chan struct{})
+				net.refresh(refreshDone)
+			}
+		case newNursery := <-net.refreshReq:
+			debugLog("<-net.refreshReq")
+			if newNursery != nil {
+				net.nursery = newNursery
+			}
+			if refreshDone == nil {
+				refreshDone = make(chan struct{})
+				net.refresh(refreshDone)
+			}
+			net.refreshResp <- refreshDone
+		case <-refreshDone:
+			debugLog("<-net.refreshDone")
+			refreshDone = nil
+		}
+		debugLog("3")
+	}
+	debugLog("loop stopped")
+
+	glog.V(logger.Debug).Infof("shutting down")
+	if net.conn != nil {
+		net.conn.Close()
+	}
+	if refreshDone != nil {
+		// TODO: wait for pending refresh.
+		//<-refreshResults
+	}
+	// Cancel all pending timeouts.
+	for _, timer := range net.timeoutTimers {
+		timer.Stop()
+	}
+	if net.db != nil {
+		net.db.close()
+	}
+	close(net.closed)
+}
+
+// Everything below runs on the Network.loop goroutine
+// and can modify Node, Table and Network at any time without locking.
+
+func (net *Network) refresh(done chan<- struct{}) {
+	var seeds []*Node
+	if net.db != nil {
+		seeds = net.db.querySeeds(seedCount, seedMaxAge)
+	}
+	if len(seeds) == 0 {
+		seeds = net.nursery
+	}
+	if len(seeds) == 0 {
+		glog.V(logger.Detail).Info("no seed nodes found")
+		close(done)
+		return
+	}
+	for _, n := range seeds {
+		if glog.V(logger.Debug) {
+			var age string
+			if net.db != nil {
+				age = time.Since(net.db.lastPong(n.ID)).String()
+			} else {
+				age = "unknown"
+			}
+			glog.Infof("seed node (age %s): %v", age, n)
+		}
+		n = net.internNodeFromDB(n)
+		if n.state == unknown {
+			net.transition(n, verifyinit)
+		}
+		// Force-add the seed node so Lookup does something.
+		// It will be deleted again if verification fails.
+		net.tab.add(n)
+	}
+	// Start self lookup to fill up the buckets.
+	go func() {
+		net.Lookup(net.tab.self.ID)
+		close(done)
+	}()
+}
+
+// Node Interning.
+
+func (net *Network) internNode(pkt *ingressPacket) *Node {
+	if n := net.nodes[pkt.remoteID]; n != nil {
+		return n
+	}
+	n := NewNode(pkt.remoteID, pkt.remoteAddr.IP, uint16(pkt.remoteAddr.Port), uint16(pkt.remoteAddr.Port))
+	n.state = unknown
+	net.nodes[pkt.remoteID] = n
+	return n
+}
+
+func (net *Network) internNodeFromDB(dbn *Node) *Node {
+	if n := net.nodes[dbn.ID]; n != nil {
+		return n
+	}
+	n := NewNode(dbn.ID, dbn.IP, dbn.UDP, dbn.TCP)
+	n.state = unknown
+	net.nodes[n.ID] = n
+	return n
+}
+
+func (net *Network) internNodeFromNeighbours(rn rpcNode) (n *Node, err error) {
+	if rn.ID == net.tab.self.ID {
+		return nil, errors.New("is self")
+	}
+	n = net.nodes[rn.ID]
+	if n == nil {
+		// We haven't seen this node before.
+		n, err = nodeFromRPC(rn)
+		n.state = unknown
+		if err == nil {
+			net.nodes[n.ID] = n
+		}
+		return n, err
+	}
+	if !bytes.Equal(n.IP, rn.IP) || n.UDP != rn.UDP || n.TCP != rn.TCP {
+		err = fmt.Errorf("metadata mismatch: got %v, want %v", rn, n)
+	}
+	return n, err
+}
+
+// nodeNetGuts is embedded in Node and contains fields.
+type nodeNetGuts struct {
+	// This is a cached copy of sha3(ID) which is used for node
+	// distance calculations. This is part of Node in order to make it
+	// possible to write tests that need a node at a certain distance.
+	// In those tests, the content of sha will not actually correspond
+	// with ID.
+	sha common.Hash
+
+	// State machine fields. Access to these fields
+	// is restricted to the Network.loop goroutine.
+	state             *nodeState
+	pingEcho          []byte           // hash of last ping sent by us
+	pingTopics        []Topic          // topic set sent by us in last ping
+	deferredQueries   []*findnodeQuery // queries that can't be sent yet
+	pendingNeighbours *findnodeQuery   // current query, waiting for reply
+	queryTimeouts     int
+}
+
+func (n *nodeNetGuts) deferQuery(q *findnodeQuery) {
+	n.deferredQueries = append(n.deferredQueries, q)
+}
+
+func (n *nodeNetGuts) startNextQuery(net *Network) {
+	if len(n.deferredQueries) == 0 {
+		return
+	}
+	nextq := n.deferredQueries[0]
+	if nextq.start(net) {
+		n.deferredQueries = append(n.deferredQueries[:0], n.deferredQueries[1:]...)
+	}
+}
+
+func (q *findnodeQuery) start(net *Network) bool {
+	// Satisfy queries against the local node directly.
+	if q.remote == net.tab.self {
+		closest := net.tab.closest(crypto.Keccak256Hash(q.target[:]), bucketSize)
+		q.reply <- closest.entries
+		return true
+	}
+	if q.remote.state.canQuery && q.remote.pendingNeighbours == nil {
+		net.conn.sendFindnodeHash(q.remote, q.target)
+		net.timedEvent(respTimeout, q.remote, neighboursTimeout)
+		q.remote.pendingNeighbours = q
+		return true
+	}
+	// If the node is not known yet, it won't accept queries.
+	// Initiate the transition to known.
+	// The request will be sent later when the node reaches known state.
+	if q.remote.state == unknown {
+		net.transition(q.remote, verifyinit)
+	}
+	return false
+}
+
+// Node Events (the input to the state machine).
+
+type nodeEvent uint
+
+//go:generate stringer -type=nodeEvent
+
+const (
+	invalidEvent nodeEvent = iota // zero is reserved
+
+	// Packet type events.
+	// These correspond to packet types in the UDP protocol.
+	pingPacket
+	pongPacket
+	findnodePacket
+	neighborsPacket
+	findnodeHashPacket
+	topicRegisterPacket
+	topicQueryPacket
+	topicNodesPacket
+
+	// Non-packet events.
+	// Event values in this category are allocated outside
+	// the packet type range (packet types are encoded as a single byte).
+	pongTimeout nodeEvent = iota + 256
+	pingTimeout
+	neighboursTimeout
+)
+
+// Node State Machine.
+
+type nodeState struct {
+	name     string
+	handle   func(*Network, *Node, nodeEvent, *ingressPacket) (next *nodeState, err error)
+	enter    func(*Network, *Node)
+	canQuery bool
+}
+
+func (s *nodeState) String() string {
+	return s.name
+}
+
+var (
+	unknown          *nodeState
+	verifyinit       *nodeState
+	verifywait       *nodeState
+	remoteverifywait *nodeState
+	known            *nodeState
+	contested        *nodeState
+	unresponsive     *nodeState
+)
+
+func init() {
+	unknown = &nodeState{
+		name: "unknown",
+		enter: func(net *Network, n *Node) {
+			net.tab.delete(n)
+			n.pingEcho = nil
+			// Abort active queries.
+			for _, q := range n.deferredQueries {
+				q.reply <- nil
+			}
+			n.deferredQueries = nil
+			if n.pendingNeighbours != nil {
+				n.pendingNeighbours.reply <- nil
+				n.pendingNeighbours = nil
+			}
+			n.queryTimeouts = 0
+		},
+		handle: func(net *Network, n *Node, ev nodeEvent, pkt *ingressPacket) (*nodeState, error) {
+			switch ev {
+			case pingPacket:
+				net.handlePing(n, pkt)
+				net.ping(n, pkt.remoteAddr)
+				return verifywait, nil
+			default:
+				return unknown, errInvalidEvent
+			}
+		},
+	}
+
+	verifyinit = &nodeState{
+		name: "verifyinit",
+		enter: func(net *Network, n *Node) {
+			net.ping(n, n.addr())
+		},
+		handle: func(net *Network, n *Node, ev nodeEvent, pkt *ingressPacket) (*nodeState, error) {
+			switch ev {
+			case pingPacket:
+				net.handlePing(n, pkt)
+				return verifywait, nil
+			case pongPacket:
+				err := net.handleKnownPong(n, pkt)
+				return remoteverifywait, err
+			case pongTimeout:
+				return unknown, nil
+			default:
+				return verifyinit, errInvalidEvent
+			}
+		},
+	}
+
+	verifywait = &nodeState{
+		name: "verifywait",
+		handle: func(net *Network, n *Node, ev nodeEvent, pkt *ingressPacket) (*nodeState, error) {
+			switch ev {
+			case pongPacket:
+				err := net.handleKnownPong(n, pkt)
+				return known, err
+			case pongTimeout:
+				return unknown, nil
+			default:
+				return verifywait, errInvalidEvent
+			}
+		},
+	}
+
+	remoteverifywait = &nodeState{
+		name: "remoteverifywait",
+		enter: func(net *Network, n *Node) {
+			net.timedEvent(respTimeout, n, pingTimeout)
+		},
+		handle: func(net *Network, n *Node, ev nodeEvent, pkt *ingressPacket) (*nodeState, error) {
+			switch ev {
+			case pingPacket:
+				net.handlePing(n, pkt)
+				return remoteverifywait, nil
+			case pingTimeout:
+				return known, nil
+			default:
+				return remoteverifywait, errInvalidEvent
+			}
+		},
+	}
+
+	known = &nodeState{
+		name:     "known",
+		canQuery: true,
+		enter: func(net *Network, n *Node) {
+			n.queryTimeouts = 0
+			n.startNextQuery(net)
+			// Insert into the table and start revalidation of the last node
+			// in the bucket if it is full.
+			last := net.tab.add(n)
+			if last != nil && last.state == known {
+				// TODO: do this asynchronously
+				net.transition(last, contested)
+			}
+		},
+		handle: func(net *Network, n *Node, ev nodeEvent, pkt *ingressPacket) (*nodeState, error) {
+			switch ev {
+			case pingPacket:
+				net.handlePing(n, pkt)
+				return known, nil
+			case pongPacket:
+				err := net.handleKnownPong(n, pkt)
+				return known, err
+			default:
+				return net.handleQueryEvent(n, ev, pkt)
+			}
+		},
+	}
+
+	contested = &nodeState{
+		name:     "contested",
+		canQuery: true,
+		enter: func(net *Network, n *Node) {
+			net.ping(n, n.addr())
+		},
+		handle: func(net *Network, n *Node, ev nodeEvent, pkt *ingressPacket) (*nodeState, error) {
+			switch ev {
+			case pongPacket:
+				// Node is still alive.
+				err := net.handleKnownPong(n, pkt)
+				return known, err
+			case pongTimeout:
+				net.tab.deleteReplace(n)
+				return unresponsive, nil
+			case pingPacket:
+				net.handlePing(n, pkt)
+				return contested, nil
+			default:
+				return net.handleQueryEvent(n, ev, pkt)
+			}
+		},
+	}
+
+	unresponsive = &nodeState{
+		name:     "unresponsive",
+		canQuery: true,
+		handle: func(net *Network, n *Node, ev nodeEvent, pkt *ingressPacket) (*nodeState, error) {
+			switch ev {
+			case pingPacket:
+				net.handlePing(n, pkt)
+				return known, nil
+			case pongPacket:
+				err := net.handleKnownPong(n, pkt)
+				return known, err
+			default:
+				return net.handleQueryEvent(n, ev, pkt)
+			}
+		},
+	}
+}
+
+// handle processes packets sent by n and events related to n.
+func (net *Network) handle(n *Node, ev nodeEvent, pkt *ingressPacket) error {
+	if pkt != nil {
+		if err := net.checkPacket(n, ev, pkt); err != nil {
+			return err
+		}
+		// Start the background expiration goroutine after the first
+		// successful communication. Subsequent calls have no effect if it
+		// is already running. We do this here instead of somewhere else
+		// so that the search for seed nodes also considers older nodes
+		// that would otherwise be removed by the expirer.
+		if net.db != nil {
+			net.db.ensureExpirer()
+		}
+	}
+	if n.state == nil {
+		n.state = unknown //???
+	}
+	next, err := n.state.handle(net, n, ev, pkt)
+	net.transition(n, next)
+	return err
+}
+
+func (net *Network) checkPacket(n *Node, ev nodeEvent, pkt *ingressPacket) error {
+	// Replay prevention checks.
+	switch ev {
+	case pingPacket, findnodePacket, neighborsPacket:
+		// TODO: check date is > last date seen
+		// TODO: check ping version
+	case pongPacket:
+		if !bytes.Equal(pkt.data.(*pong).ReplyTok, n.pingEcho) {
+			// fmt.Println("pong reply token mismatch")
+			return fmt.Errorf("pong reply token mismatch")
+		}
+		n.pingEcho = nil
+	}
+	// Address validation.
+	// TODO: Ideally we would do the following:
+	//  - reject all packets with wrong address except ping.
+	//  - for ping with new address, transition to verifywait but keep the
+	//    previous node (with old address) around. if the new one reaches known,
+	//    swap it out.
+	return nil
+}
+
+func (net *Network) transition(n *Node, next *nodeState) {
+	if n.state != next {
+		n.state = next
+		if next.enter != nil {
+			next.enter(net, n)
+		}
+	}
+
+	// TODO: persist/unpersist node
+}
+
+func (net *Network) timedEvent(d time.Duration, n *Node, ev nodeEvent) {
+	timeout := timeoutEvent{ev, n}
+	net.timeoutTimers[timeout] = time.AfterFunc(d, func() {
+		select {
+		case net.timeout <- timeout:
+		case <-net.closed:
+		}
+	})
+}
+
+func (net *Network) abortTimedEvent(n *Node, ev nodeEvent) {
+	timer := net.timeoutTimers[timeoutEvent{ev, n}]
+	if timer != nil {
+		timer.Stop()
+		delete(net.timeoutTimers, timeoutEvent{ev, n})
+	}
+}
+
+func (net *Network) ping(n *Node, addr *net.UDPAddr) {
+	debugLog(fmt.Sprintf("ping(node = %x)", n.ID[:8]))
+	n.pingTopics = net.ticketStore.regTopicSet()
+	n.pingEcho = net.conn.sendPing(n, addr, n.pingTopics)
+	net.timedEvent(respTimeout, n, pongTimeout)
+}
+
+func (net *Network) handlePing(n *Node, pkt *ingressPacket) {
+	ping := pkt.data.(*ping)
+	n.TCP = ping.From.TCP
+	t := net.topictab.getTicket(n, ping.Topics)
+
+	pong := &pong{
+		To:         makeEndpoint(n.addr(), 0), // TODO: maybe use known TCP port from DB
+		ReplyTok:   pkt.hash,
+		Expiration: uint64(time.Now().Add(expiration).Unix()),
+	}
+	ticketToPong(t, pong)
+	net.conn.send(n, pongPacket, pong)
+}
+
+func (net *Network) handleKnownPong(n *Node, pkt *ingressPacket) error {
+	debugLog(fmt.Sprintf("handleKnownPong(node = %x)", n.ID[:8]))
+	net.abortTimedEvent(n, pongTimeout)
+	now := monotonicTime()
+	ticket, err := pongToTicket(now, n.pingTopics, n, pkt)
+	if err == nil {
+		// fmt.Printf("(%x) ticket: %+v\n", net.tab.self.ID[:8], pkt.data)
+		net.ticketStore.addTicket(now, pkt.data.(*pong).ReplyTok, ticket)
+	} else {
+		debugLog(fmt.Sprintf(" error: %v", err))
+	}
+
+	n.pingEcho = nil
+	n.pingTopics = nil
+	return err
+}
+
+func (net *Network) handleQueryEvent(n *Node, ev nodeEvent, pkt *ingressPacket) (*nodeState, error) {
+	switch ev {
+	case findnodePacket:
+		target := crypto.Keccak256Hash(pkt.data.(*findnode).Target[:])
+		results := net.tab.closest(target, bucketSize).entries
+		net.conn.sendNeighbours(n, results)
+		return n.state, nil
+	case neighborsPacket:
+		err := net.handleNeighboursPacket(n, pkt.data.(*neighbors))
+		return n.state, err
+	case neighboursTimeout:
+		if n.pendingNeighbours != nil {
+			n.pendingNeighbours.reply <- nil
+			n.pendingNeighbours = nil
+		}
+		n.queryTimeouts++
+		if n.queryTimeouts > maxFindnodeFailures && n.state == known {
+			return contested, errors.New("too many timeouts")
+		}
+		return n.state, nil
+
+	// v5
+
+	case findnodeHashPacket:
+		results := net.tab.closest(pkt.data.(*findnodeHash).Target, bucketSize).entries
+		net.conn.sendNeighbours(n, results)
+		return n.state, nil
+	case topicRegisterPacket:
+		//fmt.Println("got topicRegisterPacket")
+		regdata := pkt.data.(*topicRegister)
+		pong, err := net.checkTopicRegister(regdata)
+		if err != nil {
+			//fmt.Println(err)
+			return n.state, fmt.Errorf("bad waiting ticket: %v", err)
+		}
+		net.topictab.useTicket(n, pong.TicketSerial, regdata.Topics, regdata.Idx, pong.Expiration, pong.WaitPeriods)
+		return n.state, nil
+	case topicQueryPacket:
+		results := net.topictab.getEntries(pkt.data.(*topicQuery).Topic)
+		if len(results) > 10 {
+			results = results[:10]
+		}
+		var hash common.Hash
+		copy(hash[:], pkt.hash)
+		net.conn.sendTopicNodes(n, hash, results)
+		return n.state, nil
+	case topicNodesPacket:
+		// if n.pendingTopicNodes != nil {
+		// 	n.pendingNeighbours.reply <- nil
+		// 	n.pendingNeighbours = nil
+		// }
+		// n.queryTimeouts++
+		// if n.queryTimeouts > maxFindnodeFailures && n.state == known {
+		// 	return contested, errors.New("too many timeouts")
+		// }
+		//
+		// if n.pendingTopicNodes != nil {
+		//
+		// }
+		return n.state, nil
+
+	default:
+		return n.state, errInvalidEvent
+	}
+}
+
+func (net *Network) checkTopicRegister(data *topicRegister) (*pong, error) {
+	var pongpkt ingressPacket
+	//fmt.Println("got", data.Topics, data.Pong)
+	if err := decodePacket(data.Pong, &pongpkt); err != nil {
+		return nil, err
+	}
+	if pongpkt.ev != pongPacket {
+		return nil, errors.New("is not pong packet")
+	}
+	if pongpkt.remoteID != net.tab.self.ID {
+		return nil, errors.New("not signed by us")
+	}
+	// check that we previously authorised all topics
+	// that the other side is trying to register.
+	if rlpHash(data.Topics) != pongpkt.data.(*pong).TopicHash {
+		return nil, errors.New("topic hash mismatch")
+	}
+	if data.Idx < 0 || data.Idx >= len(data.Topics) {
+		return nil, errors.New("topic index out of range")
+	}
+	return pongpkt.data.(*pong), nil
+}
+
+func rlpHash(x interface{}) (h common.Hash) {
+	hw := sha3.NewKeccak256()
+	rlp.Encode(hw, x)
+	hw.Sum(h[:0])
+	return h
+}
+
+func (net *Network) handleNeighboursPacket(n *Node, req *neighbors) error {
+	if n.pendingNeighbours == nil {
+		return errNoQuery
+	}
+	net.abortTimedEvent(n, neighboursTimeout)
+
+	nodes := make([]*Node, len(req.Nodes))
+	for i, rn := range req.Nodes {
+		nn, err := net.internNodeFromNeighbours(rn)
+		if err != nil {
+			glog.V(logger.Debug).Infof("invalid neighbour from %x: %v", n.ID[:8], err)
+			continue
+		}
+		nodes[i] = nn
+		// Start validation of query results immediately.
+		// This fills the table quickly.
+		// TODO: generates way too many packets, maybe do it via queue.
+		if nn.state == unknown {
+			net.transition(nn, verifyinit)
+		}
+	}
+	// TODO: don't ignore second packet
+	n.pendingNeighbours.reply <- nodes
+	n.pendingNeighbours = nil
+	// Now that this query is done, start the next one.
+	n.startNextQuery(net)
+	return nil
+}
diff --git a/vendor/github.com/ethereum/go-ethereum/p2p/discv5/node.go b/vendor/github.com/ethereum/go-ethereum/p2p/discv5/node.go
new file mode 100644
index 000000000..b6b6f149d
--- /dev/null
+++ b/vendor/github.com/ethereum/go-ethereum/p2p/discv5/node.go
@@ -0,0 +1,423 @@
+// Copyright 2015 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package discv5
+
+import (
+	"bytes"
+	"crypto/ecdsa"
+	"crypto/elliptic"
+	"encoding/hex"
+	"errors"
+	"fmt"
+	"math/big"
+	"math/rand"
+	"net"
+	"net/url"
+	"regexp"
+	"strconv"
+	"strings"
+
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/crypto"
+)
+
+// Node represents a host on the network.
+// The public fields of Node may not be modified.
+type Node struct {
+	IP       net.IP // len 4 for IPv4 or 16 for IPv6
+	UDP, TCP uint16 // port numbers
+	ID       NodeID // the node's public key
+
+	// Network-related fields are contained in nodeNetGuts.
+	// These fields are not supposed to be used off the
+	// Network.loop goroutine.
+	nodeNetGuts
+}
+
+// NewNode creates a new node. It is mostly meant to be used for
+// testing purposes.
+func NewNode(id NodeID, ip net.IP, udpPort, tcpPort uint16) *Node {
+	if ipv4 := ip.To4(); ipv4 != nil {
+		ip = ipv4
+	}
+	return &Node{
+		IP:          ip,
+		UDP:         udpPort,
+		TCP:         tcpPort,
+		ID:          id,
+		nodeNetGuts: nodeNetGuts{sha: crypto.Keccak256Hash(id[:])},
+	}
+}
+
+func (n *Node) addr() *net.UDPAddr {
+	return &net.UDPAddr{IP: n.IP, Port: int(n.UDP)}
+}
+
+func (n *Node) setAddr(a *net.UDPAddr) {
+	n.IP = a.IP
+	if ipv4 := a.IP.To4(); ipv4 != nil {
+		n.IP = ipv4
+	}
+	n.UDP = uint16(a.Port)
+}
+
+// compares the given address against the stored values.
+func (n *Node) addrEqual(a *net.UDPAddr) bool {
+	ip := a.IP
+	if ipv4 := a.IP.To4(); ipv4 != nil {
+		ip = ipv4
+	}
+	return n.UDP == uint16(a.Port) && bytes.Equal(n.IP, ip)
+}
+
+// Incomplete returns true for nodes with no IP address.
+func (n *Node) Incomplete() bool {
+	return n.IP == nil
+}
+
+// checks whether n is a valid complete node.
+func (n *Node) validateComplete() error {
+	if n.Incomplete() {
+		return errors.New("incomplete node")
+	}
+	if n.UDP == 0 {
+		return errors.New("missing UDP port")
+	}
+	if n.TCP == 0 {
+		return errors.New("missing TCP port")
+	}
+	if n.IP.IsMulticast() || n.IP.IsUnspecified() {
+		return errors.New("invalid IP (multicast/unspecified)")
+	}
+	_, err := n.ID.Pubkey() // validate the key (on curve, etc.)
+	return err
+}
+
+// The string representation of a Node is a URL.
+// Please see ParseNode for a description of the format.
+func (n *Node) String() string {
+	u := url.URL{Scheme: "enode"}
+	if n.Incomplete() {
+		u.Host = fmt.Sprintf("%x", n.ID[:])
+	} else {
+		addr := net.TCPAddr{IP: n.IP, Port: int(n.TCP)}
+		u.User = url.User(fmt.Sprintf("%x", n.ID[:]))
+		u.Host = addr.String()
+		if n.UDP != n.TCP {
+			u.RawQuery = "discport=" + strconv.Itoa(int(n.UDP))
+		}
+	}
+	return u.String()
+}
+
+var incompleteNodeURL = regexp.MustCompile("(?i)^(?:enode://)?([0-9a-f]+)$")
+
+// ParseNode parses a node designator.
+//
+// There are two basic forms of node designators
+//   - incomplete nodes, which only have the public key (node ID)
+//   - complete nodes, which contain the public key and IP/Port information
+//
+// For incomplete nodes, the designator must look like one of these
+//
+//    enode://<hex node id>
+//    <hex node id>
+//
+// For complete nodes, the node ID is encoded in the username portion
+// of the URL, separated from the host by an @ sign. The hostname can
+// only be given as an IP address, DNS domain names are not allowed.
+// The port in the host name section is the TCP listening port. If the
+// TCP and UDP (discovery) ports differ, the UDP port is specified as
+// query parameter "discport".
+//
+// In the following example, the node URL describes
+// a node with IP address 10.3.58.6, TCP listening port 30303
+// and UDP discovery port 30301.
+//
+//    enode://<hex node id>@10.3.58.6:30303?discport=30301
+func ParseNode(rawurl string) (*Node, error) {
+	if m := incompleteNodeURL.FindStringSubmatch(rawurl); m != nil {
+		id, err := HexID(m[1])
+		if err != nil {
+			return nil, fmt.Errorf("invalid node ID (%v)", err)
+		}
+		return NewNode(id, nil, 0, 0), nil
+	}
+	return parseComplete(rawurl)
+}
+
+func parseComplete(rawurl string) (*Node, error) {
+	var (
+		id               NodeID
+		ip               net.IP
+		tcpPort, udpPort uint64
+	)
+	u, err := url.Parse(rawurl)
+	if err != nil {
+		return nil, err
+	}
+	if u.Scheme != "enode" {
+		return nil, errors.New("invalid URL scheme, want \"enode\"")
+	}
+	// Parse the Node ID from the user portion.
+	if u.User == nil {
+		return nil, errors.New("does not contain node ID")
+	}
+	if id, err = HexID(u.User.String()); err != nil {
+		return nil, fmt.Errorf("invalid node ID (%v)", err)
+	}
+	// Parse the IP address.
+	host, port, err := net.SplitHostPort(u.Host)
+	if err != nil {
+		return nil, fmt.Errorf("invalid host: %v", err)
+	}
+	if ip = net.ParseIP(host); ip == nil {
+		return nil, errors.New("invalid IP address")
+	}
+	// Ensure the IP is 4 bytes long for IPv4 addresses.
+	if ipv4 := ip.To4(); ipv4 != nil {
+		ip = ipv4
+	}
+	// Parse the port numbers.
+	if tcpPort, err = strconv.ParseUint(port, 10, 16); err != nil {
+		return nil, errors.New("invalid port")
+	}
+	udpPort = tcpPort
+	qv := u.Query()
+	if qv.Get("discport") != "" {
+		udpPort, err = strconv.ParseUint(qv.Get("discport"), 10, 16)
+		if err != nil {
+			return nil, errors.New("invalid discport in query")
+		}
+	}
+	return NewNode(id, ip, uint16(udpPort), uint16(tcpPort)), nil
+}
+
+// MustParseNode parses a node URL. It panics if the URL is not valid.
+func MustParseNode(rawurl string) *Node {
+	n, err := ParseNode(rawurl)
+	if err != nil {
+		panic("invalid node URL: " + err.Error())
+	}
+	return n
+}
+
+// type nodeQueue []*Node
+//
+// // pushNew adds n to the end if it is not present.
+// func (nl *nodeList) appendNew(n *Node) {
+// 	for _, entry := range n {
+// 		if entry == n {
+// 			return
+// 		}
+// 	}
+// 	*nq = append(*nq, n)
+// }
+//
+// // popRandom removes a random node. Nodes closer to
+// // to the head of the beginning of the have a slightly higher probability.
+// func (nl *nodeList) popRandom() *Node {
+// 	ix := rand.Intn(len(*nq))
+// 	//TODO: probability as mentioned above.
+// 	nl.removeIndex(ix)
+// }
+//
+// func (nl *nodeList) removeIndex(i int) *Node {
+// 	slice = *nl
+// 	if len(*slice) <= i {
+// 		return nil
+// 	}
+// 	*nl = append(slice[:i], slice[i+1:]...)
+// }
+
+const nodeIDBits = 512
+
+// NodeID is a unique identifier for each node.
+// The node identifier is a marshaled elliptic curve public key.
+type NodeID [nodeIDBits / 8]byte
+
+// NodeID prints as a long hexadecimal number.
+func (n NodeID) String() string {
+	return fmt.Sprintf("%x", n[:])
+}
+
+// The Go syntax representation of a NodeID is a call to HexID.
+func (n NodeID) GoString() string {
+	return fmt.Sprintf("discover.HexID(\"%x\")", n[:])
+}
+
+// HexID converts a hex string to a NodeID.
+// The string may be prefixed with 0x.
+func HexID(in string) (NodeID, error) {
+	if strings.HasPrefix(in, "0x") {
+		in = in[2:]
+	}
+	var id NodeID
+	b, err := hex.DecodeString(in)
+	if err != nil {
+		return id, err
+	} else if len(b) != len(id) {
+		return id, fmt.Errorf("wrong length, want %d hex chars", len(id)*2)
+	}
+	copy(id[:], b)
+	return id, nil
+}
+
+// MustHexID converts a hex string to a NodeID.
+// It panics if the string is not a valid NodeID.
+func MustHexID(in string) NodeID {
+	id, err := HexID(in)
+	if err != nil {
+		panic(err)
+	}
+	return id
+}
+
+// PubkeyID returns a marshaled representation of the given public key.
+func PubkeyID(pub *ecdsa.PublicKey) NodeID {
+	var id NodeID
+	pbytes := elliptic.Marshal(pub.Curve, pub.X, pub.Y)
+	if len(pbytes)-1 != len(id) {
+		panic(fmt.Errorf("need %d bit pubkey, got %d bits", (len(id)+1)*8, len(pbytes)))
+	}
+	copy(id[:], pbytes[1:])
+	return id
+}
+
+// Pubkey returns the public key represented by the node ID.
+// It returns an error if the ID is not a point on the curve.
+func (id NodeID) Pubkey() (*ecdsa.PublicKey, error) {
+	p := &ecdsa.PublicKey{Curve: S256(), X: new(big.Int), Y: new(big.Int)}
+	half := len(id) / 2
+	p.X.SetBytes(id[:half])
+	p.Y.SetBytes(id[half:])
+	if !p.Curve.IsOnCurve(p.X, p.Y) {
+		return nil, errors.New("id is invalid secp256k1 curve point")
+	}
+	return p, nil
+}
+
+func (id NodeID) mustPubkey() ecdsa.PublicKey {
+	pk, err := id.Pubkey()
+	if err != nil {
+		panic(err)
+	}
+	return *pk
+}
+
+// recoverNodeID computes the public key used to sign the
+// given hash from the signature.
+func recoverNodeID(hash, sig []byte) (id NodeID, err error) {
+	pubkey, err := crypto.Ecrecover(hash, sig)
+	if err != nil {
+		return id, err
+	}
+	if len(pubkey)-1 != len(id) {
+		return id, fmt.Errorf("recovered pubkey has %d bits, want %d bits", len(pubkey)*8, (len(id)+1)*8)
+	}
+	for i := range id {
+		id[i] = pubkey[i+1]
+	}
+	return id, nil
+}
+
+// distcmp compares the distances a->target and b->target.
+// Returns -1 if a is closer to target, 1 if b is closer to target
+// and 0 if they are equal.
+func distcmp(target, a, b common.Hash) int {
+	for i := range target {
+		da := a[i] ^ target[i]
+		db := b[i] ^ target[i]
+		if da > db {
+			return 1
+		} else if da < db {
+			return -1
+		}
+	}
+	return 0
+}
+
+// table of leading zero counts for bytes [0..255]
+var lzcount = [256]int{
+	8, 7, 6, 6, 5, 5, 5, 5,
+	4, 4, 4, 4, 4, 4, 4, 4,
+	3, 3, 3, 3, 3, 3, 3, 3,
+	3, 3, 3, 3, 3, 3, 3, 3,
+	2, 2, 2, 2, 2, 2, 2, 2,
+	2, 2, 2, 2, 2, 2, 2, 2,
+	2, 2, 2, 2, 2, 2, 2, 2,
+	2, 2, 2, 2, 2, 2, 2, 2,
+	1, 1, 1, 1, 1, 1, 1, 1,
+	1, 1, 1, 1, 1, 1, 1, 1,
+	1, 1, 1, 1, 1, 1, 1, 1,
+	1, 1, 1, 1, 1, 1, 1, 1,
+	1, 1, 1, 1, 1, 1, 1, 1,
+	1, 1, 1, 1, 1, 1, 1, 1,
+	1, 1, 1, 1, 1, 1, 1, 1,
+	1, 1, 1, 1, 1, 1, 1, 1,
+	0, 0, 0, 0, 0, 0, 0, 0,
+	0, 0, 0, 0, 0, 0, 0, 0,
+	0, 0, 0, 0, 0, 0, 0, 0,
+	0, 0, 0, 0, 0, 0, 0, 0,
+	0, 0, 0, 0, 0, 0, 0, 0,
+	0, 0, 0, 0, 0, 0, 0, 0,
+	0, 0, 0, 0, 0, 0, 0, 0,
+	0, 0, 0, 0, 0, 0, 0, 0,
+	0, 0, 0, 0, 0, 0, 0, 0,
+	0, 0, 0, 0, 0, 0, 0, 0,
+	0, 0, 0, 0, 0, 0, 0, 0,
+	0, 0, 0, 0, 0, 0, 0, 0,
+	0, 0, 0, 0, 0, 0, 0, 0,
+	0, 0, 0, 0, 0, 0, 0, 0,
+	0, 0, 0, 0, 0, 0, 0, 0,
+	0, 0, 0, 0, 0, 0, 0, 0,
+}
+
+// logdist returns the logarithmic distance between a and b, log2(a ^ b).
+func logdist(a, b common.Hash) int {
+	lz := 0
+	for i := range a {
+		x := a[i] ^ b[i]
+		if x == 0 {
+			lz += 8
+		} else {
+			lz += lzcount[x]
+			break
+		}
+	}
+	return len(a)*8 - lz
+}
+
+// hashAtDistance returns a random hash such that logdist(a, b) == n
+func hashAtDistance(a common.Hash, n int) (b common.Hash) {
+	if n == 0 {
+		return a
+	}
+	// flip bit at position n, fill the rest with random bits
+	b = a
+	pos := len(a) - n/8 - 1
+	bit := byte(0x01) << (byte(n%8) - 1)
+	if bit == 0 {
+		pos++
+		bit = 0x80
+	}
+	b[pos] = a[pos]&^bit | ^a[pos]&bit // TODO: randomize end bits
+	for i := pos + 1; i < len(a); i++ {
+		b[i] = byte(rand.Intn(255))
+	}
+	return b
+}
diff --git a/vendor/github.com/ethereum/go-ethereum/p2p/discv5/nodeevent_string.go b/vendor/github.com/ethereum/go-ethereum/p2p/discv5/nodeevent_string.go
new file mode 100644
index 000000000..fde9045c5
--- /dev/null
+++ b/vendor/github.com/ethereum/go-ethereum/p2p/discv5/nodeevent_string.go
@@ -0,0 +1,27 @@
+// Code generated by "stringer -type nodeEvent"; DO NOT EDIT
+
+package discv5
+
+import "fmt"
+
+const (
+	_nodeEvent_name_0 = "invalidEventpingPacketpongPacketfindnodePacketneighborsPacketfindnodeHashPackettopicRegisterPackettopicQueryPackettopicNodesPacket"
+	_nodeEvent_name_1 = "pongTimeoutpingTimeoutneighboursTimeout"
+)
+
+var (
+	_nodeEvent_index_0 = [...]uint8{0, 12, 22, 32, 46, 61, 79, 98, 114, 130}
+	_nodeEvent_index_1 = [...]uint8{0, 11, 22, 39}
+)
+
+func (i nodeEvent) String() string {
+	switch {
+	case 0 <= i && i <= 8:
+		return _nodeEvent_name_0[_nodeEvent_index_0[i]:_nodeEvent_index_0[i+1]]
+	case 265 <= i && i <= 267:
+		i -= 265
+		return _nodeEvent_name_1[_nodeEvent_index_1[i]:_nodeEvent_index_1[i+1]]
+	default:
+		return fmt.Sprintf("nodeEvent(%d)", i)
+	}
+}
diff --git a/vendor/github.com/ethereum/go-ethereum/p2p/discv5/ntp.go b/vendor/github.com/ethereum/go-ethereum/p2p/discv5/ntp.go
new file mode 100644
index 000000000..81c0e6336
--- /dev/null
+++ b/vendor/github.com/ethereum/go-ethereum/p2p/discv5/ntp.go
@@ -0,0 +1,127 @@
+// Copyright 2016 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+// Contains the NTP time drift detection via the SNTP protocol:
+//   https://tools.ietf.org/html/rfc4330
+
+package discv5
+
+import (
+	"fmt"
+	"net"
+	"sort"
+	"strings"
+	"time"
+
+	"github.com/ethereum/go-ethereum/logger"
+	"github.com/ethereum/go-ethereum/logger/glog"
+)
+
+const (
+	ntpPool   = "pool.ntp.org" // ntpPool is the NTP server to query for the current time
+	ntpChecks = 3              // Number of measurements to do against the NTP server
+)
+
+// durationSlice attaches the methods of sort.Interface to []time.Duration,
+// sorting in increasing order.
+type durationSlice []time.Duration
+
+func (s durationSlice) Len() int           { return len(s) }
+func (s durationSlice) Less(i, j int) bool { return s[i] < s[j] }
+func (s durationSlice) Swap(i, j int)      { s[i], s[j] = s[j], s[i] }
+
+// checkClockDrift queries an NTP server for clock drifts and warns the user if
+// one large enough is detected.
+func checkClockDrift() {
+	drift, err := sntpDrift(ntpChecks)
+	if err != nil {
+		return
+	}
+	if drift < -driftThreshold || drift > driftThreshold {
+		warning := fmt.Sprintf("System clock seems off by %v, which can prevent network connectivity", drift)
+		howtofix := fmt.Sprintf("Please enable network time synchronisation in system settings")
+		separator := strings.Repeat("-", len(warning))
+
+		glog.V(logger.Warn).Info(separator)
+		glog.V(logger.Warn).Info(warning)
+		glog.V(logger.Warn).Info(howtofix)
+		glog.V(logger.Warn).Info(separator)
+	} else {
+		glog.V(logger.Debug).Infof("Sanity NTP check reported %v drift, all ok", drift)
+	}
+}
+
+// sntpDrift does a naive time resolution against an NTP server and returns the
+// measured drift. This method uses the simple version of NTP. It's not precise
+// but should be fine for these purposes.
+//
+// Note, it executes two extra measurements compared to the number of requested
+// ones to be able to discard the two extremes as outliers.
+func sntpDrift(measurements int) (time.Duration, error) {
+	// Resolve the address of the NTP server
+	addr, err := net.ResolveUDPAddr("udp", ntpPool+":123")
+	if err != nil {
+		return 0, err
+	}
+	// Construct the time request (empty package with only 2 fields set):
+	//   Bits 3-5: Protocol version, 3
+	//   Bits 6-8: Mode of operation, client, 3
+	request := make([]byte, 48)
+	request[0] = 3<<3 | 3
+
+	// Execute each of the measurements
+	drifts := []time.Duration{}
+	for i := 0; i < measurements+2; i++ {
+		// Dial the NTP server and send the time retrieval request
+		conn, err := net.DialUDP("udp", nil, addr)
+		if err != nil {
+			return 0, err
+		}
+		defer conn.Close()
+
+		sent := time.Now()
+		if _, err = conn.Write(request); err != nil {
+			return 0, err
+		}
+		// Retrieve the reply and calculate the elapsed time
+		conn.SetDeadline(time.Now().Add(5 * time.Second))
+
+		reply := make([]byte, 48)
+		if _, err = conn.Read(reply); err != nil {
+			return 0, err
+		}
+		elapsed := time.Since(sent)
+
+		// Reconstruct the time from the reply data
+		sec := uint64(reply[43]) | uint64(reply[42])<<8 | uint64(reply[41])<<16 | uint64(reply[40])<<24
+		frac := uint64(reply[47]) | uint64(reply[46])<<8 | uint64(reply[45])<<16 | uint64(reply[44])<<24
+
+		nanosec := sec*1e9 + (frac*1e9)>>32
+
+		t := time.Date(1900, 1, 1, 0, 0, 0, 0, time.UTC).Add(time.Duration(nanosec)).Local()
+
+		// Calculate the drift based on an assumed answer time of RRT/2
+		drifts = append(drifts, sent.Sub(t)+elapsed/2)
+	}
+	// Calculate average drif (drop two extremities to avoid outliers)
+	sort.Sort(durationSlice(drifts))
+
+	drift := time.Duration(0)
+	for i := 1; i < len(drifts)-1; i++ {
+		drift += drifts[i]
+	}
+	return drift / time.Duration(measurements), nil
+}
diff --git a/vendor/github.com/ethereum/go-ethereum/p2p/discv5/table.go b/vendor/github.com/ethereum/go-ethereum/p2p/discv5/table.go
new file mode 100644
index 000000000..f3f2797f2
--- /dev/null
+++ b/vendor/github.com/ethereum/go-ethereum/p2p/discv5/table.go
@@ -0,0 +1,258 @@
+// Copyright 2015 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+// Package discv5 implements the RLPx v5 Topic Discovery Protocol.
+//
+// The Topic Discovery protocol provides a way to find RLPx nodes that
+// can be connected to. It uses a Kademlia-like protocol to maintain a
+// distributed database of the IDs and endpoints of all listening
+// nodes.
+package discv5
+
+import (
+	"crypto/rand"
+	"encoding/binary"
+	"net"
+	"sort"
+
+	"github.com/ethereum/go-ethereum/common"
+)
+
+const (
+	alpha      = 3  // Kademlia concurrency factor
+	bucketSize = 16 // Kademlia bucket size
+	hashBits   = len(common.Hash{}) * 8
+	nBuckets   = hashBits + 1 // Number of buckets
+
+	maxBondingPingPongs = 16
+	maxFindnodeFailures = 5
+)
+
+type Table struct {
+	count         int               // number of nodes
+	buckets       [nBuckets]*bucket // index of known nodes by distance
+	nodeAddedHook func(*Node)       // for testing
+	self          *Node             // metadata of the local node
+}
+
+// bucket contains nodes, ordered by their last activity. the entry
+// that was most recently active is the first element in entries.
+type bucket struct {
+	entries      []*Node
+	replacements []*Node
+}
+
+func newTable(ourID NodeID, ourAddr *net.UDPAddr) *Table {
+	self := NewNode(ourID, ourAddr.IP, uint16(ourAddr.Port), uint16(ourAddr.Port))
+	tab := &Table{self: self}
+	for i := range tab.buckets {
+		tab.buckets[i] = new(bucket)
+	}
+	return tab
+}
+
+// readRandomNodes fills the given slice with random nodes from the
+// table. It will not write the same node more than once. The nodes in
+// the slice are copies and can be modified by the caller.
+func (tab *Table) readRandomNodes(buf []*Node) (n int) {
+	// TODO: tree-based buckets would help here
+	// Find all non-empty buckets and get a fresh slice of their entries.
+	var buckets [][]*Node
+	for _, b := range tab.buckets {
+		if len(b.entries) > 0 {
+			buckets = append(buckets, b.entries[:])
+		}
+	}
+	if len(buckets) == 0 {
+		return 0
+	}
+	// Shuffle the buckets.
+	for i := uint32(len(buckets)) - 1; i > 0; i-- {
+		j := randUint(i)
+		buckets[i], buckets[j] = buckets[j], buckets[i]
+	}
+	// Move head of each bucket into buf, removing buckets that become empty.
+	var i, j int
+	for ; i < len(buf); i, j = i+1, (j+1)%len(buckets) {
+		b := buckets[j]
+		buf[i] = &(*b[0])
+		buckets[j] = b[1:]
+		if len(b) == 1 {
+			buckets = append(buckets[:j], buckets[j+1:]...)
+		}
+		if len(buckets) == 0 {
+			break
+		}
+	}
+	return i + 1
+}
+
+func randUint(max uint32) uint32 {
+	if max == 0 {
+		return 0
+	}
+	var b [4]byte
+	rand.Read(b[:])
+	return binary.BigEndian.Uint32(b[:]) % max
+}
+
+// closest returns the n nodes in the table that are closest to the
+// given id. The caller must hold tab.mutex.
+func (tab *Table) closest(target common.Hash, nresults int) *nodesByDistance {
+	// This is a very wasteful way to find the closest nodes but
+	// obviously correct. I believe that tree-based buckets would make
+	// this easier to implement efficiently.
+	close := &nodesByDistance{target: target}
+	for _, b := range tab.buckets {
+		for _, n := range b.entries {
+			close.push(n, nresults)
+		}
+	}
+	return close
+}
+
+// add attempts to add the given node its corresponding bucket. If the
+// bucket has space available, adding the node succeeds immediately.
+// Otherwise, the node is added to the replacement cache for the bucket.
+func (tab *Table) add(n *Node) (contested *Node) {
+	b := tab.buckets[logdist(tab.self.sha, n.sha)]
+	switch {
+	case b.bump(n):
+		// n exists in b.
+		return nil
+	case len(b.entries) < bucketSize:
+		// b has space available.
+		b.addFront(n)
+		tab.count++
+		if tab.nodeAddedHook != nil {
+			tab.nodeAddedHook(n)
+		}
+		return nil
+	default:
+		// b has no space left, add to replacement cache
+		// and revalidate the last entry.
+		// TODO: drop previous node
+		b.replacements = append(b.replacements, n)
+		if len(b.replacements) > bucketSize {
+			copy(b.replacements, b.replacements[1:])
+			b.replacements = b.replacements[:len(b.replacements)-1]
+		}
+		return b.entries[len(b.entries)-1]
+	}
+}
+
+// stuff adds nodes the table to the end of their corresponding bucket
+// if the bucket is not full.
+func (tab *Table) stuff(nodes []*Node) {
+outer:
+	for _, n := range nodes {
+		if n.ID == tab.self.ID {
+			continue // don't add self
+		}
+		bucket := tab.buckets[logdist(tab.self.sha, n.sha)]
+		for i := range bucket.entries {
+			if bucket.entries[i].ID == n.ID {
+				continue outer // already in bucket
+			}
+		}
+		if len(bucket.entries) < bucketSize {
+			bucket.entries = append(bucket.entries, n)
+			tab.count++
+			if tab.nodeAddedHook != nil {
+				tab.nodeAddedHook(n)
+			}
+		}
+	}
+}
+
+// delete removes an entry from the node table (used to evacuate
+// failed/non-bonded discovery peers).
+func (tab *Table) delete(node *Node) {
+	bucket := tab.buckets[logdist(tab.self.sha, node.sha)]
+	for i := range bucket.entries {
+		if bucket.entries[i].ID == node.ID {
+			bucket.entries = append(bucket.entries[:i], bucket.entries[i+1:]...)
+			tab.count--
+			return
+		}
+	}
+}
+
+func (tab *Table) deleteReplace(node *Node) {
+	b := tab.buckets[logdist(tab.self.sha, node.sha)]
+	i := 0
+	for i < len(b.entries) {
+		if b.entries[i].ID == node.ID {
+			b.entries = append(b.entries[:i], b.entries[i+1:]...)
+			tab.count--
+		} else {
+			i++
+		}
+	}
+	// refill from replacement cache
+	// TODO: maybe use random index
+	if len(b.entries) < bucketSize && len(b.replacements) > 0 {
+		ri := len(b.replacements) - 1
+		b.addFront(b.replacements[ri])
+		tab.count++
+		b.replacements[ri] = nil
+		b.replacements = b.replacements[:ri]
+	}
+}
+
+func (b *bucket) addFront(n *Node) {
+	b.entries = append(b.entries, nil)
+	copy(b.entries[1:], b.entries)
+	b.entries[0] = n
+}
+
+func (b *bucket) bump(n *Node) bool {
+	for i := range b.entries {
+		if b.entries[i].ID == n.ID {
+			// move it to the front
+			copy(b.entries[1:], b.entries[:i])
+			b.entries[0] = n
+			return true
+		}
+	}
+	return false
+}
+
+// nodesByDistance is a list of nodes, ordered by
+// distance to target.
+type nodesByDistance struct {
+	entries []*Node
+	target  common.Hash
+}
+
+// push adds the given node to the list, keeping the total size below maxElems.
+func (h *nodesByDistance) push(n *Node, maxElems int) {
+	ix := sort.Search(len(h.entries), func(i int) bool {
+		return distcmp(h.target, h.entries[i].sha, n.sha) > 0
+	})
+	if len(h.entries) < maxElems {
+		h.entries = append(h.entries, n)
+	}
+	if ix == len(h.entries) {
+		// farther away than all nodes we already have.
+		// if there was room for it, the node is now the last element.
+	} else {
+		// slide existing entries down to make room
+		// this will overwrite the entry we just appended.
+		copy(h.entries[ix+1:], h.entries[ix:])
+		h.entries[ix] = n
+	}
+}
diff --git a/vendor/github.com/ethereum/go-ethereum/p2p/discv5/testimg/1 b/vendor/github.com/ethereum/go-ethereum/p2p/discv5/testimg/1
new file mode 100644
index 000000000..f2acfdc06
--- /dev/null
+++ b/vendor/github.com/ethereum/go-ethereum/p2p/discv5/testimg/1
@@ -0,0 +1,173 @@
+package main
+
+import (
+	"bufio"
+	"encoding/binary"
+	"fmt"
+	"image"
+	"image/png"
+	"os"
+	"sort"
+	"strconv"
+
+	"github.com/ethereum/go-ethereum/crypto"
+)
+
+var xs, ys, maxTime int
+
+func set(pic *image.NRGBA, x, y, c, v int) {
+	if v > 255 {
+		v = 255
+	}
+	if x >= 0 && x < xs && y >= 0 && y < ys {
+		pic.Pix[y*pic.Stride+x*4+c] = uint8(v)
+	}
+}
+
+func main() {
+	topicHash := crypto.Keccak256Hash([]byte("foo"))
+	fmt.Println(topicHash)
+	topicPrefix := binary.BigEndian.Uint64(topicHash[:8])
+	var nodes uint64Slice
+
+	inputFile := "test.out"
+	if len(os.Args) > 1 {
+		inputFile = os.Args[1]
+	}
+
+	f, _ := os.Open(inputFile)
+	scanner := bufio.NewScanner(f)
+	scanner.Split(bufio.ScanWords)
+	for scanner.Scan() {
+		w := scanner.Text()
+		if w == "*N" {
+			scanner.Scan()
+			prefix, _ := strconv.ParseUint(scanner.Text(), 16, 64)
+			nodes = append(nodes, prefix^topicPrefix)
+		}
+		if w == "*R" {
+			scanner.Scan()
+			time, _ := strconv.ParseInt(scanner.Text(), 10, 64)
+			if int(time) > maxTime {
+				maxTime = int(time)
+			}
+		}
+	}
+	f.Close()
+	sort.Sort(nodes)
+	nodeIdx := make(map[uint64]int)
+	for i, v := range nodes {
+		nodeIdx[v^topicPrefix] = i
+	}
+
+	xs = maxTime / 10000
+	ys = len(nodes)
+
+	pic := image.NewNRGBA(image.Rect(0, 0, xs, ys))
+	for y := 0; y < ys; y++ {
+		for x := 0; x < xs; x++ {
+			set(pic, x, y, 3, 255)
+		}
+	}
+
+	pic2 := image.NewNRGBA(image.Rect(0, 0, xs, ys))
+	for y := 0; y < ys; y++ {
+		for x := 0; x < xs; x++ {
+			set(pic2, x, y, 3, 255)
+		}
+	}
+
+	f, _ = os.Open(inputFile)
+	scanner = bufio.NewScanner(f)
+	scanner.Split(bufio.ScanWords)
+
+	nodeRad := make(map[uint64]int)
+
+	for scanner.Scan() {
+		w := scanner.Text()
+		if w == "*R" {
+			scanner.Scan()
+			time, _ := strconv.ParseInt(scanner.Text(), 10, 64)
+			scanner.Scan()
+			prefix, _ := strconv.ParseUint(scanner.Text(), 16, 64)
+			scanner.Scan()
+			rad, _ := strconv.ParseInt(scanner.Text(), 10, 64)
+			if int(rad) != nodeRad[prefix] {
+				nodeRad[prefix] = int(rad)
+				radUint := uint64(rad) * ((^uint64(0)) / 1000000)
+				x := int(time * int64(xs) / int64(maxTime))
+				y := sort.Search(ys, func(i int) bool {
+					return nodes[i] > radUint
+				})
+				set(pic, x, y, 1, 255)
+			}
+		}
+		if w == "*MR" {
+			scanner.Scan()
+			time, _ := strconv.ParseInt(scanner.Text(), 10, 64)
+			scanner.Scan()
+			scanner.Scan()
+			rad, _ := strconv.ParseInt(scanner.Text(), 10, 64)
+			radUint := uint64(rad) * ((^uint64(0)) / 1000000)
+			x := int(time * int64(xs) / int64(maxTime))
+			y := sort.Search(ys, func(i int) bool {
+				return nodes[i] > radUint
+			})
+			set(pic, x, y, 0, 255)
+		}
+		if w == "*W" {
+			scanner.Scan()
+			time, _ := strconv.ParseInt(scanner.Text(), 10, 64)
+			scanner.Scan()
+			prefix, _ := strconv.ParseUint(scanner.Text(), 16, 64)
+			scanner.Scan()
+			wp, _ := strconv.ParseInt(scanner.Text(), 10, 64)
+			x := int(time * int64(xs) / int64(maxTime))
+			y := nodeIdx[prefix]
+			set(pic2, x, y, 0, int(wp/100000))
+			set(pic2, x, y, 1, int(wp/10000))
+			set(pic2, x, y, 2, int(wp/1000))
+		}
+		if w == "*+" {
+			scanner.Scan()
+			time, _ := strconv.ParseInt(scanner.Text(), 10, 64)
+			scanner.Scan()
+			prefix, _ := strconv.ParseUint(scanner.Text(), 16, 64)
+			x := int(time * int64(xs) / int64(maxTime))
+			y := nodeIdx[prefix]
+			set(pic, x, y, 2, 255)
+			scanner.Scan()
+		}
+	}
+	f.Close()
+
+	f, _ = os.Create("test.png")
+	w := bufio.NewWriter(f)
+	png.Encode(w, pic)
+	w.Flush()
+	f.Close()
+
+	f, _ = os.Create("test2.png")
+	w = bufio.NewWriter(f)
+	png.Encode(w, pic2)
+	w.Flush()
+	f.Close()
+}
+
+type uint64Slice []uint64
+
+// Len is the number of elements in the collection.
+func (s uint64Slice) Len() int {
+	return len(s)
+}
+
+// Less reports whether the element with
+// index i should sort before the element with index j.
+func (s uint64Slice) Less(i, j int) bool {
+	return s[i] < s[j]
+}
+
+// Swap swaps the elements with indexes i and j.
+func (s uint64Slice) Swap(i, j int) {
+	s[i], s[j] = s[j], s[i]
+}
diff --git a/vendor/github.com/ethereum/go-ethereum/p2p/discv5/testimg/2 b/vendor/github.com/ethereum/go-ethereum/p2p/discv5/testimg/2
new file mode 100644
index 000000000..2638eff4f
--- /dev/null
+++ b/vendor/github.com/ethereum/go-ethereum/p2p/discv5/testimg/2
@@ -0,0 +1,178 @@
+package main
+
+import (
+	"bufio"
+	"encoding/binary"
+	"fmt"
+	"image"
+	"image/png"
+	"os"
+	"sort"
+	"strconv"
+
+	"github.com/ethereum/go-ethereum/crypto"
+)
+
+var xs, ys, maxTime int
+
+func set(pic *image.NRGBA, x, y, c, v int) {
+	if v > 255 {
+		v = 255
+	}
+	if x >= 0 && x < xs && y >= 0 && y < ys {
+		pic.Pix[y*pic.Stride+x*4+c] = uint8(v)
+	}
+}
+
+func main() {
+	topics := make(map[string]uint64)
+	var nodes uint64Slice
+
+	inputFile := "test.out"
+	if len(os.Args) > 1 {
+		inputFile = os.Args[1]
+	}
+
+	f, _ := os.Open(inputFile)
+	scanner := bufio.NewScanner(f)
+	scanner.Split(bufio.ScanWords)
+	for scanner.Scan() {
+		w := scanner.Text()
+		if w == "*N" {
+			scanner.Scan()
+			prefix, _ := strconv.ParseUint(scanner.Text(), 16, 64)
+			nodes = append(nodes, prefix^topicPrefix)
+		}
+		if w == "*R" {
+			scanner.Scan()
+			time, _ := strconv.ParseInt(scanner.Text(), 10, 64)
+			if int(time) > maxTime {
+				maxTime = int(time)
+			}
+			scanner.Scan()
+			topic := scanner.Text()
+			if _, ok := topics[topic]; !ok {
+				fmt.Println(topic)
+				topicHash := crypto.Keccak256Hash([]byte(topic))
+				topics[topic] := binary.BigEndian.Uint64(topicHash[:8])
+			}
+		}
+	}
+	f.Close()
+	sort.Sort(nodes)
+	nodeIdx := make(map[uint64]int)
+	for i, v := range nodes {
+		nodeIdx[v^topicPrefix] = i
+	}
+
+	xs = maxTime / 10000
+	ys = len(nodes)
+
+	pic := image.NewNRGBA(image.Rect(0, 0, xs, ys))
+	for y := 0; y < ys; y++ {
+		for x := 0; x < xs; x++ {
+			set(pic, x, y, 3, 255)
+		}
+	}
+
+	pic2 := image.NewNRGBA(image.Rect(0, 0, xs, ys))
+	for y := 0; y < ys; y++ {
+		for x := 0; x < xs; x++ {
+			set(pic2, x, y, 3, 255)
+		}
+	}
+
+	f, _ = os.Open(inputFile)
+	scanner = bufio.NewScanner(f)
+	scanner.Split(bufio.ScanWords)
+
+	nodeRad := make(map[uint64]int)
+
+	for scanner.Scan() {
+		w := scanner.Text()
+		if w == "*R" {
+			scanner.Scan()
+			time, _ := strconv.ParseInt(scanner.Text(), 10, 64)
+			scanner.Scan()
+			prefix, _ := strconv.ParseUint(scanner.Text(), 16, 64)
+			scanner.Scan()
+			rad, _ := strconv.ParseInt(scanner.Text(), 10, 64)
+			if int(rad) != nodeRad[prefix] {
+				nodeRad[prefix] = int(rad)
+				radUint := uint64(rad) * ((^uint64(0)) / 1000000)
+				x := int(time * int64(xs) / int64(maxTime))
+				y := sort.Search(ys, func(i int) bool {
+					return nodes[i] > radUint
+				})
+				set(pic, x, y, 1, 255)
+			}
+		}
+		if w == "*MR" {
+			scanner.Scan()
+			time, _ := strconv.ParseInt(scanner.Text(), 10, 64)
+			scanner.Scan()
+			scanner.Scan()
+			rad, _ := strconv.ParseInt(scanner.Text(), 10, 64)
+			radUint := uint64(rad) * ((^uint64(0)) / 1000000)
+			x := int(time * int64(xs) / int64(maxTime))
+			y := sort.Search(ys, func(i int) bool {
+				return nodes[i] > radUint
+			})
+			set(pic, x, y, 0, 255)
+		}
+		if w == "*W" {
+			scanner.Scan()
+			time, _ := strconv.ParseInt(scanner.Text(), 10, 64)
+			scanner.Scan()
+			prefix, _ := strconv.ParseUint(scanner.Text(), 16, 64)
+			scanner.Scan()
+			wp, _ := strconv.ParseInt(scanner.Text(), 10, 64)
+			x := int(time * int64(xs) / int64(maxTime))
+			y := nodeIdx[prefix]
+			set(pic2, x, y, 0, int(wp/100000))
+			set(pic2, x, y, 1, int(wp/10000))
+			set(pic2, x, y, 2, int(wp/1000))
+		}
+		if w == "*+" {
+			scanner.Scan()
+			time, _ := strconv.ParseInt(scanner.Text(), 10, 64)
+			scanner.Scan()
+			prefix, _ := strconv.ParseUint(scanner.Text(), 16, 64)
+			x := int(time * int64(xs) / int64(maxTime))
+			y := nodeIdx[prefix]
+			set(pic, x, y, 2, 255)
+			scanner.Scan()
+		}
+	}
+	f.Close()
+
+	f, _ = os.Create("test.png")
+	w := bufio.NewWriter(f)
+	png.Encode(w, pic)
+	w.Flush()
+	f.Close()
+
+	f, _ = os.Create("test2.png")
+	w = bufio.NewWriter(f)
+	png.Encode(w, pic2)
+	w.Flush()
+	f.Close()
+}
+
+type uint64Slice []uint64
+
+// Len is the number of elements in the collection.
+func (s uint64Slice) Len() int {
+	return len(s)
+}
+
+// Less reports whether the element with
+// index i should sort before the element with index j.
+func (s uint64Slice) Less(i, j int) bool {
+	return s[i] < s[j]
+}
+
+// Swap swaps the elements with indexes i and j.
+func (s uint64Slice) Swap(i, j int) {
+	s[i], s[j] = s[j], s[i]
+}
diff --git a/vendor/github.com/ethereum/go-ethereum/p2p/discv5/testimg/testimg.1 b/vendor/github.com/ethereum/go-ethereum/p2p/discv5/testimg/testimg.1
new file mode 100644
index 000000000..32268aa97
--- /dev/null
+++ b/vendor/github.com/ethereum/go-ethereum/p2p/discv5/testimg/testimg.1
@@ -0,0 +1,191 @@
+package main
+
+import (
+	"bufio"
+	"encoding/binary"
+	"fmt"
+	"image"
+	"image/png"
+	"os"
+	"sort"
+	"strconv"
+
+	"github.com/ethereum/go-ethereum/crypto"
+)
+
+var xs, ys, maxTime int
+
+func set(pic *image.NRGBA, x, y, c, v int) {
+	if v > 255 {
+		v = 255
+	}
+	if x >= 0 && x < xs && y >= 0 && y < ys {
+		pic.Pix[y*pic.Stride+x*4+c] = uint8(v)
+	}
+}
+
+func main() {
+	var nodes uint64Slice
+
+	inputFile := "test.out"
+	if len(os.Args) > 1 {
+		inputFile = os.Args[1]
+	}
+
+	topic := "foo"
+	if len(os.Args) > 2 {
+		topic = os.Args[2]
+	}
+
+	topicHash := crypto.Keccak256Hash([]byte(topic))
+	fmt.Println(topicHash)
+	topicPrefix := binary.BigEndian.Uint64(topicHash[:8])
+
+	f, _ := os.Open(inputFile)
+	scanner := bufio.NewScanner(f)
+	scanner.Split(bufio.ScanWords)
+	for scanner.Scan() {
+		w := scanner.Text()
+		if w == "*N" {
+			scanner.Scan()
+			prefix, _ := strconv.ParseUint(scanner.Text(), 16, 64)
+			nodes = append(nodes, prefix^topicPrefix)
+		}
+		if w == "*R" {
+			scanner.Scan()
+			time, _ := strconv.ParseInt(scanner.Text(), 10, 64)
+			if int(time) > maxTime {
+				maxTime = int(time)
+			}
+		}
+	}
+	f.Close()
+	sort.Sort(nodes)
+	nodeIdx := make(map[uint64]int)
+	for i, v := range nodes {
+		nodeIdx[v^topicPrefix] = i
+	}
+
+	xs = maxTime / 10000
+	ys = len(nodes)
+
+	pic := image.NewNRGBA(image.Rect(0, 0, xs, ys))
+	for y := 0; y < ys; y++ {
+		for x := 0; x < xs; x++ {
+			set(pic, x, y, 3, 255)
+		}
+	}
+
+	pic2 := image.NewNRGBA(image.Rect(0, 0, xs, ys))
+	for y := 0; y < ys; y++ {
+		for x := 0; x < xs; x++ {
+			set(pic2, x, y, 3, 255)
+		}
+	}
+
+	f, _ = os.Open(inputFile)
+	scanner = bufio.NewScanner(f)
+	scanner.Split(bufio.ScanWords)
+
+	nodeRad := make(map[uint64]int)
+
+	for scanner.Scan() {
+		w := scanner.Text()
+		if w == "*R" {
+			scanner.Scan()
+			time, _ := strconv.ParseInt(scanner.Text(), 10, 64)
+			scanner.Scan()
+			if scanner.Text() == topic {
+				scanner.Scan()
+				prefix, _ := strconv.ParseUint(scanner.Text(), 16, 64)
+				scanner.Scan()
+				rad, _ := strconv.ParseInt(scanner.Text(), 10, 64)
+				if int(rad) != nodeRad[prefix] {
+					nodeRad[prefix] = int(rad)
+					radUint := uint64(rad) * ((^uint64(0)) / 1000000)
+					x := int(time * int64(xs) / int64(maxTime))
+					y := sort.Search(ys, func(i int) bool {
+						return nodes[i] > radUint
+					})
+					set(pic, x, y, 1, 255)
+				}
+			}
+		}
+		if w == "*MR" {
+			scanner.Scan()
+			time, _ := strconv.ParseInt(scanner.Text(), 10, 64)
+			scanner.Scan()
+			if scanner.Text() == topic {
+				scanner.Scan()
+				scanner.Scan()
+				rad, _ := strconv.ParseInt(scanner.Text(), 10, 64)
+				radUint := uint64(rad) * ((^uint64(0)) / 1000000)
+				x := int(time * int64(xs) / int64(maxTime))
+				y := sort.Search(ys, func(i int) bool {
+					return nodes[i] > radUint
+				})
+				set(pic, x, y, 0, 255)
+			}
+		}
+		if w == "*W" {
+			scanner.Scan()
+			time, _ := strconv.ParseInt(scanner.Text(), 10, 64)
+			scanner.Scan()
+			if scanner.Text() == topic {
+				scanner.Scan()
+				prefix, _ := strconv.ParseUint(scanner.Text(), 16, 64)
+				scanner.Scan()
+				wp, _ := strconv.ParseInt(scanner.Text(), 10, 64)
+				x := int(time * int64(xs) / int64(maxTime))
+				y := nodeIdx[prefix]
+				set(pic2, x, y, 0, int(wp/100000))
+				set(pic2, x, y, 1, int(wp/10000))
+				set(pic2, x, y, 2, int(wp/1000))
+			}
+		}
+		if w == "*+" {
+			scanner.Scan()
+			time, _ := strconv.ParseInt(scanner.Text(), 10, 64)
+			scanner.Scan()
+			if scanner.Text() == topic {
+				scanner.Scan()
+				prefix, _ := strconv.ParseUint(scanner.Text(), 16, 64)
+				x := int(time * int64(xs) / int64(maxTime))
+				y := nodeIdx[prefix]
+				set(pic, x, y, 2, 255)
+				scanner.Scan()
+			}
+		}
+	}
+	f.Close()
+
+	f, _ = os.Create("test.png")
+	w := bufio.NewWriter(f)
+	png.Encode(w, pic)
+	w.Flush()
+	f.Close()
+
+	f, _ = os.Create("test2.png")
+	w = bufio.NewWriter(f)
+	png.Encode(w, pic2)
+	w.Flush()
+	f.Close()
+}
+
+type uint64Slice []uint64
+
+// Len is the number of elements in the collection.
+func (s uint64Slice) Len() int {
+	return len(s)
+}
+
+// Less reports whether the element with
+// index i should sort before the element with index j.
+func (s uint64Slice) Less(i, j int) bool {
+	return s[i] < s[j]
+}
+
+// Swap swaps the elements with indexes i and j.
+func (s uint64Slice) Swap(i, j int) {
+	s[i], s[j] = s[j], s[i]
+}
diff --git a/vendor/github.com/ethereum/go-ethereum/p2p/discv5/testimg/testimg.go b/vendor/github.com/ethereum/go-ethereum/p2p/discv5/testimg/testimg.go
new file mode 100644
index 000000000..fb7bcafc7
--- /dev/null
+++ b/vendor/github.com/ethereum/go-ethereum/p2p/discv5/testimg/testimg.go
@@ -0,0 +1,324 @@
+package main
+
+import (
+	"bufio"
+	"encoding/binary"
+	"fmt"
+	"image"
+	"image/png"
+	"os"
+	"sort"
+	"strconv"
+
+	"github.com/ethereum/go-ethereum/crypto"
+)
+
+var xs, ys, maxTime int
+
+func set(pic *image.NRGBA, x, y, c, v int) {
+	if v > 255 {
+		v = 255
+	}
+	if x >= 0 && x < xs && y >= 0 && y < ys {
+		pic.Pix[y*pic.Stride+x*4+c] = uint8(v)
+	}
+}
+
+type nodeStats []struct{ wpSum, wpCnt, wpXcnt, regCnt, regXcnt uint64 }
+
+type nodeInfo struct {
+	maxMR  int
+	topics map[string]struct{}
+}
+
+const (
+	regStatDiv  = 60
+	regStatYdiv = 30
+)
+
+type topicInfo struct {
+	prefix    uint64
+	nodes     uint64Slice
+	nodeStats nodeStats
+	nodeIdx   map[uint64]int
+	pic, pic2 *image.NRGBA
+	nodeRad   map[uint64]int
+	regStats  []int
+}
+
+func main() {
+	var nodes uint64Slice
+	topics := make(map[string]*topicInfo)
+
+	inputFile := "test.out"
+	if len(os.Args) > 1 {
+		inputFile = os.Args[1]
+	}
+
+	f, _ := os.Open(inputFile)
+	scanner := bufio.NewScanner(f)
+	scanner.Split(bufio.ScanWords)
+	for scanner.Scan() {
+		w := scanner.Text()
+		if w == "*N" {
+			scanner.Scan()
+			prefix, _ := strconv.ParseUint(scanner.Text(), 16, 64)
+			nodes = append(nodes, prefix)
+		}
+		if w == "*R" {
+			scanner.Scan()
+			time, _ := strconv.ParseInt(scanner.Text(), 10, 64)
+			if int(time) > maxTime {
+				maxTime = int(time)
+			}
+			scanner.Scan()
+			topic := scanner.Text()
+			if _, ok := topics[topic]; !ok {
+				fmt.Println(topic)
+				topicHash := crypto.Keccak256Hash([]byte(topic))
+				topics[topic] = &topicInfo{prefix: binary.BigEndian.Uint64(topicHash[:8])}
+			}
+		}
+	}
+	f.Close()
+
+	xs = maxTime / 10000
+	ys = len(nodes)
+	nodeIdx := make(map[uint64]int)
+	for i, v := range nodes {
+		nodeIdx[v] = i
+	}
+	nodeInfo := make([]nodeInfo, len(nodes))
+
+	for _, t := range topics {
+		t.nodes = make(uint64Slice, len(nodes))
+		t.nodeStats = make(nodeStats, len(nodes))
+		for i, v := range nodes {
+			t.nodes[i] = v ^ t.prefix
+		}
+		sort.Sort(t.nodes)
+		t.nodeIdx = make(map[uint64]int)
+		for i, v := range t.nodes {
+			t.nodeIdx[v^t.prefix] = i
+		}
+
+		t.pic = image.NewNRGBA(image.Rect(0, 0, xs, ys))
+		for y := 0; y < ys; y++ {
+			for x := 0; x < xs; x++ {
+				set(t.pic, x, y, 3, 255)
+			}
+		}
+
+		t.pic2 = image.NewNRGBA(image.Rect(0, 0, xs, ys))
+		for y := 0; y < ys; y++ {
+			for x := 0; x < xs; x++ {
+				set(t.pic2, x, y, 3, 255)
+			}
+		}
+		t.nodeRad = make(map[uint64]int)
+		t.regStats = make([]int, xs/regStatDiv+1)
+	}
+
+	f, _ = os.Open(inputFile)
+	scanner = bufio.NewScanner(f)
+	scanner.Split(bufio.ScanWords)
+	statBegin := int64(40000000)
+	statEnd := int64(maxTime - 10000000)
+
+	for scanner.Scan() {
+		w := scanner.Text()
+		if w == "*R" {
+			scanner.Scan()
+			time, _ := strconv.ParseInt(scanner.Text(), 10, 64)
+			scanner.Scan()
+			t := topics[scanner.Text()]
+			scanner.Scan()
+			prefix, _ := strconv.ParseUint(scanner.Text(), 16, 64)
+			scanner.Scan()
+			rad, _ := strconv.ParseInt(scanner.Text(), 10, 64)
+			if int(rad) != t.nodeRad[prefix] {
+				t.nodeRad[prefix] = int(rad)
+				radUint := uint64(rad) * ((^uint64(0)) / 1000000)
+				x := int(time * int64(xs) / int64(maxTime))
+				y := sort.Search(ys, func(i int) bool {
+					return t.nodes[i] > radUint
+				})
+				set(t.pic, x, y, 1, 255)
+			}
+		}
+		if w == "*MR" {
+			scanner.Scan()
+			time, _ := strconv.ParseInt(scanner.Text(), 10, 64)
+			scanner.Scan()
+			topic := scanner.Text()
+			t := topics[topic]
+			scanner.Scan()
+			prefix, _ := strconv.ParseUint(scanner.Text(), 16, 64)
+			scanner.Scan()
+			rad, _ := strconv.ParseInt(scanner.Text(), 10, 64)
+			radUint := uint64(rad) * ((^uint64(0)) / 1000000)
+			x := int(time * int64(xs) / int64(maxTime))
+			y := sort.Search(ys, func(i int) bool {
+				return t.nodes[i] > radUint
+			})
+			set(t.pic, x, y, 0, 255)
+			ni := nodeInfo[nodeIdx[prefix]]
+			if int(rad) > ni.maxMR {
+				ni.maxMR = int(rad)
+				if ni.topics == nil {
+					ni.topics = make(map[string]struct{})
+				}
+				ni.topics[topic] = struct{}{}
+			}
+			nodeInfo[nodeIdx[prefix]] = ni
+		}
+		if w == "*W" {
+			scanner.Scan()
+			time, _ := strconv.ParseInt(scanner.Text(), 10, 64)
+			scanner.Scan()
+			t := topics[scanner.Text()]
+			scanner.Scan()
+			prefix, _ := strconv.ParseUint(scanner.Text(), 16, 64)
+			scanner.Scan()
+			wp, _ := strconv.ParseInt(scanner.Text(), 10, 64)
+			x := int(time * int64(xs) / int64(maxTime))
+			y := t.nodeIdx[prefix]
+			if time >= statBegin && time < statEnd {
+				t.nodeStats[y].wpSum += uint64(wp)
+				if wp >= 600000 {
+					t.nodeStats[y].wpXcnt++
+				}
+				t.nodeStats[y].wpCnt++
+			}
+			/*set(t.pic2, x, y, 0, int(wp/100000))
+			set(t.pic2, x, y, 1, int(wp/10000))
+			set(t.pic2, x, y, 2, int(wp/1000))*/
+			if wp >= 1800000 {
+				set(t.pic2, x, y, 0, 255)
+			}
+			if wp >= 600000 {
+				set(t.pic2, x, y, 1, 255)
+			}
+			if wp >= 60000 {
+				set(t.pic2, x, y, 2, 255)
+			}
+		}
+		if w == "*+" {
+			scanner.Scan()
+			time, _ := strconv.ParseInt(scanner.Text(), 10, 64)
+			scanner.Scan()
+			t := topics[scanner.Text()]
+			scanner.Scan()
+			prefix, _ := strconv.ParseUint(scanner.Text(), 16, 64)
+			x := int(time * int64(xs) / int64(maxTime))
+			if x < xs {
+				t.regStats[x/regStatDiv]++
+			}
+			y := t.nodeIdx[prefix]
+			set(t.pic, x, y, 2, 255)
+			scanner.Scan()
+			prefix2, _ := strconv.ParseUint(scanner.Text(), 16, 64)
+			y2 := t.nodeIdx[prefix2]
+			if time >= statBegin && time < statEnd {
+				t.nodeStats[y].regCnt++
+				t.nodeStats[y2].regXcnt++
+			}
+		}
+	}
+	f.Close()
+
+	for tt, t := range topics {
+		f, _ = os.Create("test_" + tt + ".png")
+		w := bufio.NewWriter(f)
+		png.Encode(w, t.pic)
+		w.Flush()
+		f.Close()
+
+		for x := 0; x < xs; x++ {
+			yy := t.regStats[x/regStatDiv] / regStatYdiv
+			if yy > ys {
+				yy = ys
+			}
+			for y := 0; y < yy; y++ {
+				set(t.pic2, x, ys-1-y, 1, 255)
+			}
+		}
+
+		f, _ = os.Create("test2_" + tt + ".png")
+		w = bufio.NewWriter(f)
+		png.Encode(w, t.pic2)
+		w.Flush()
+		f.Close()
+
+		if statEnd > statBegin {
+			xxs := len(t.nodeStats)
+			yys := 1000
+			yyh := yys / 2
+			pic3 := image.NewNRGBA(image.Rect(0, 0, xxs, yys))
+			for y := 0; y < yys; y++ {
+				for x := 0; x < xxs; x++ {
+					set(pic3, x, y, 3, 255)
+				}
+			}
+			for x := 0; x < xxs; x++ {
+				wpy := 0
+				if t.nodeStats[x].wpCnt > 0 {
+					//					wpy = int(t.nodeStats[x].wpSum / t.nodeStats[x].wpCnt / 10000)
+					wpy = int(uint64(yyh) * t.nodeStats[x].wpXcnt / t.nodeStats[x].wpCnt)
+				}
+				if wpy > yyh {
+					wpy = yyh
+				}
+				for y := 0; y < wpy; y++ {
+					set(pic3, x, yys-1-y, 1, 255)
+				}
+				regy := int(t.nodeStats[x].regCnt * 2400000 / uint64(statEnd-statBegin))
+				if regy > yyh {
+					regy = yyh
+				}
+				for y := 0; y < regy; y++ {
+					set(pic3, x, yyh-1-y, 2, 255)
+				}
+				regy2 := int(t.nodeStats[x].regXcnt * 2400000 / uint64(statEnd-statBegin))
+				if regy2 > yyh {
+					regy2 = yyh
+				}
+				for y := 0; y < regy2; y++ {
+					set(pic3, x, yyh-1-y, 0, 255)
+				}
+			}
+
+			f, _ = os.Create("test3_" + tt + ".png")
+			w = bufio.NewWriter(f)
+			png.Encode(w, pic3)
+			w.Flush()
+			f.Close()
+		}
+	}
+
+	for i, ni := range nodeInfo {
+		fmt.Printf("%d %016x  maxMR = %d  ", i, nodes[i], ni.maxMR)
+		for t, _ := range ni.topics {
+			fmt.Printf(" %s", t)
+		}
+		fmt.Println()
+	}
+}
+
+type uint64Slice []uint64
+
+// Len is the number of elements in the collection.
+func (s uint64Slice) Len() int {
+	return len(s)
+}
+
+// Less reports whether the element with
+// index i should sort before the element with index j.
+func (s uint64Slice) Less(i, j int) bool {
+	return s[i] < s[j]
+}
+
+// Swap swaps the elements with indexes i and j.
+func (s uint64Slice) Swap(i, j int) {
+	s[i], s[j] = s[j], s[i]
+}
diff --git a/vendor/github.com/ethereum/go-ethereum/p2p/discv5/ticket.go b/vendor/github.com/ethereum/go-ethereum/p2p/discv5/ticket.go
new file mode 100644
index 000000000..0807600c9
--- /dev/null
+++ b/vendor/github.com/ethereum/go-ethereum/p2p/discv5/ticket.go
@@ -0,0 +1,684 @@
+// Copyright 2015 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package discv5
+
+import (
+	"bytes"
+	"encoding/binary"
+	"fmt"
+	"math/rand"
+	"sort"
+	"time"
+
+	"github.com/aristanetworks/goarista/atime"
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/crypto"
+)
+
+const (
+	ticketTimeBucketLen = time.Minute
+	timeWindow          = 10 // * ticketTimeBucketLen
+	wantTicketsInWindow = 10
+	collectFrequency    = time.Second * 30
+	registerFrequency   = time.Second * 60
+	maxCollectDebt      = 10
+	maxRegisterDebt     = 5
+	keepTicketConst     = time.Minute * 10
+	keepTicketExp       = time.Minute * 5
+	maxRadius           = 0xffffffffffffffff
+	minRadAverage       = 100
+	minRadStableAfter   = 50
+	targetWaitTime      = time.Minute * 10
+	adjustRatio         = 0.001
+	adjustCooldownStart = 0.1
+	adjustCooldownStep  = 0.01
+	radiusExtendRatio   = 1.5
+)
+
+// absTime represents absolute monotonic time in nanoseconds.
+type absTime time.Duration
+
+func monotonicTime() absTime {
+	return absTime(atime.NanoTime())
+}
+
+// timeBucket represents absolute monotonic time in minutes.
+// It is used as the index into the per-topic ticket buckets.
+type timeBucket int
+
+type ticket struct {
+	topics  []Topic
+	regTime []absTime // Per-topic local absolute time when the ticket can be used.
+
+	// The serial number that was issued by the server.
+	serial uint32
+	// Used by registrar, tracks absolute time when the ticket was created.
+	issueTime absTime
+
+	// Fields used only by registrants
+	node   *Node  // the registrar node that signed this ticket
+	refCnt int    // tracks number of topics that will be registered using this ticket
+	pong   []byte // encoded pong packet signed by the registrar
+}
+
+// ticketRef refers to a single topic in a ticket.
+type ticketRef struct {
+	t   *ticket
+	idx int // index of the topic in t.topics and t.regTime
+}
+
+func (ref ticketRef) topic() Topic {
+	return ref.t.topics[ref.idx]
+}
+
+func (ref ticketRef) topicRegTime() absTime {
+	return ref.t.regTime[ref.idx]
+}
+
+func pongToTicket(localTime absTime, topics []Topic, node *Node, p *ingressPacket) (*ticket, error) {
+	wps := p.data.(*pong).WaitPeriods
+	if len(topics) != len(wps) {
+		return nil, fmt.Errorf("bad wait period list: got %d values, want %d", len(topics), len(wps))
+	}
+	if rlpHash(topics) != p.data.(*pong).TopicHash {
+		return nil, fmt.Errorf("bad topic hash")
+	}
+	t := &ticket{
+		issueTime: localTime,
+		node:      node,
+		topics:    topics,
+		pong:      p.rawData,
+		regTime:   make([]absTime, len(wps)),
+	}
+	// Convert wait periods to local absolute time.
+	for i, wp := range wps {
+		t.regTime[i] = localTime + absTime(time.Second*time.Duration(wp))
+	}
+	return t, nil
+}
+
+func ticketToPong(t *ticket, pong *pong) {
+	pong.Expiration = uint64(t.issueTime / absTime(time.Second))
+	pong.TopicHash = rlpHash(t.topics)
+	pong.TicketSerial = t.serial
+	pong.WaitPeriods = make([]uint32, len(t.regTime))
+	for i, regTime := range t.regTime {
+		pong.WaitPeriods[i] = uint32(time.Duration(regTime-t.issueTime) / time.Second)
+	}
+}
+
+type ticketStore struct {
+	// radius detector and target address generator
+	// exists for both searched and registered topics
+	radius map[Topic]*topicRadius
+
+	// Contains buckets (for each absolute minute) of tickets
+	// that can be used in that minute.
+	// This is only set if the topic is being registered.
+	tickets     map[Topic]topicTickets
+	regtopics   []Topic
+	nodes       map[*Node]*ticket
+	nodeLastReq map[*Node]reqInfo
+
+	lastBucketFetched timeBucket
+	nextTicketCached  *ticketRef
+	nextTicketReg     absTime
+
+	minRadCnt, minRadPtr uint64
+	minRadius, minRadSum uint64
+	lastMinRads          [minRadAverage]uint64
+}
+
+type topicTickets struct {
+	buckets             map[timeBucket][]ticketRef
+	nextLookup, nextReg absTime
+}
+
+func newTicketStore() *ticketStore {
+	return &ticketStore{
+		radius:      make(map[Topic]*topicRadius),
+		tickets:     make(map[Topic]topicTickets),
+		nodes:       make(map[*Node]*ticket),
+		nodeLastReq: make(map[*Node]reqInfo),
+	}
+}
+
+// addTopic starts tracking a topic. If register is true,
+// the local node will register the topic and tickets will be collected.
+// It can be called even
+func (s *ticketStore) addTopic(t Topic, register bool) {
+	debugLog(fmt.Sprintf(" addTopic(%v, %v)", t, register))
+	if s.radius[t] == nil {
+		s.radius[t] = newTopicRadius(t)
+	}
+	if register && s.tickets[t].buckets == nil {
+		s.tickets[t] = topicTickets{buckets: make(map[timeBucket][]ticketRef)}
+	}
+}
+
+// removeRegisterTopic deletes all tickets for the given topic.
+func (s *ticketStore) removeRegisterTopic(topic Topic) {
+	debugLog(fmt.Sprintf(" removeRegisterTopic(%v)", topic))
+	for _, list := range s.tickets[topic].buckets {
+		for _, ref := range list {
+			ref.t.refCnt--
+			if ref.t.refCnt == 0 {
+				delete(s.nodes, ref.t.node)
+				delete(s.nodeLastReq, ref.t.node)
+			}
+		}
+	}
+	delete(s.tickets, topic)
+}
+
+func (s *ticketStore) regTopicSet() []Topic {
+	topics := make([]Topic, 0, len(s.tickets))
+	for topic := range s.tickets {
+		topics = append(topics, topic)
+	}
+	return topics
+}
+
+// nextRegisterLookup returns the target of the next lookup for ticket collection.
+func (s *ticketStore) nextRegisterLookup() (lookup lookupInfo, delay time.Duration) {
+	debugLog("nextRegisterLookup()")
+	firstTopic, ok := s.iterRegTopics()
+	for topic := firstTopic; ok; {
+		debugLog(fmt.Sprintf(" checking topic %v, len(s.tickets[topic]) = %d", topic, len(s.tickets[topic].buckets)))
+		if s.tickets[topic].buckets != nil && s.needMoreTickets(topic) {
+			next := s.radius[topic].nextTarget()
+			debugLog(fmt.Sprintf(" %x 1s", next[:8]))
+			return lookupInfo{target: next, topic: topic}, 1 * time.Second
+		}
+		topic, ok = s.iterRegTopics()
+		if topic == firstTopic {
+			break // We have checked all topics.
+		}
+	}
+	debugLog(" null, 40s")
+	return lookupInfo{}, 40 * time.Second
+}
+
+// iterRegTopics returns topics to register in arbitrary order.
+// The second return value is false if there are no topics.
+func (s *ticketStore) iterRegTopics() (Topic, bool) {
+	debugLog("iterRegTopics()")
+	if len(s.regtopics) == 0 {
+		if len(s.tickets) == 0 {
+			debugLog(" false")
+			return "", false
+		}
+		// Refill register list.
+		for t := range s.tickets {
+			s.regtopics = append(s.regtopics, t)
+		}
+	}
+	topic := s.regtopics[len(s.regtopics)-1]
+	s.regtopics = s.regtopics[:len(s.regtopics)-1]
+	debugLog(" " + string(topic) + " true")
+	return topic, true
+}
+
+func (s *ticketStore) needMoreTickets(t Topic) bool {
+	return s.tickets[t].nextLookup < monotonicTime()
+}
+
+// ticketsInWindow returns the tickets of a given topic in the registration window.
+func (s *ticketStore) ticketsInWindow(t Topic) []ticketRef {
+	ltBucket := s.lastBucketFetched
+	var res []ticketRef
+	tickets := s.tickets[t].buckets
+	for g := ltBucket; g < ltBucket+timeWindow; g++ {
+		res = append(res, tickets[g]...)
+	}
+	debugLog(fmt.Sprintf("ticketsInWindow(%v) = %v", t, len(res)))
+	return res
+}
+
+func (s *ticketStore) removeExcessTickets(t Topic) {
+	tickets := s.ticketsInWindow(t)
+	if len(tickets) <= wantTicketsInWindow {
+		return
+	}
+	sort.Sort(ticketRefByWaitTime(tickets))
+	for _, r := range tickets[wantTicketsInWindow:] {
+		s.removeTicketRef(r)
+	}
+}
+
+type ticketRefByWaitTime []ticketRef
+
+// Len is the number of elements in the collection.
+func (s ticketRefByWaitTime) Len() int {
+	return len(s)
+}
+
+func (r ticketRef) waitTime() absTime {
+	return r.t.regTime[r.idx] - r.t.issueTime
+}
+
+// Less reports whether the element with
+// index i should sort before the element with index j.
+func (s ticketRefByWaitTime) Less(i, j int) bool {
+	return s[i].waitTime() < s[j].waitTime()
+}
+
+// Swap swaps the elements with indexes i and j.
+func (s ticketRefByWaitTime) Swap(i, j int) {
+	s[i], s[j] = s[j], s[i]
+}
+
+func (s *ticketStore) addTicketRef(r ticketRef) {
+	topic := r.t.topics[r.idx]
+	t := s.tickets[topic]
+	if t.buckets == nil {
+		return
+	}
+	bucket := timeBucket(r.t.regTime[r.idx] / absTime(ticketTimeBucketLen))
+	t.buckets[bucket] = append(t.buckets[bucket], r)
+	r.t.refCnt++
+
+	min := monotonicTime() - absTime(collectFrequency)*maxCollectDebt
+	if t.nextLookup < min {
+		t.nextLookup = min
+	}
+	t.nextLookup += absTime(collectFrequency)
+	s.tickets[topic] = t
+
+	//s.removeExcessTickets(topic)
+}
+
+func (s *ticketStore) nextFilteredTicket() (t *ticketRef, wait time.Duration) {
+	now := monotonicTime()
+	for {
+		t, wait = s.nextRegisterableTicket()
+		if t == nil {
+			return
+		}
+		regTime := now + absTime(wait)
+		topic := t.t.topics[t.idx]
+		if regTime >= s.tickets[topic].nextReg {
+			return
+		}
+		s.removeTicketRef(*t)
+	}
+}
+
+func (s *ticketStore) ticketRegistered(t ticketRef) {
+	now := monotonicTime()
+
+	topic := t.t.topics[t.idx]
+	tt := s.tickets[topic]
+	min := now - absTime(registerFrequency)*maxRegisterDebt
+	if min > tt.nextReg {
+		tt.nextReg = min
+	}
+	tt.nextReg += absTime(registerFrequency)
+	s.tickets[topic] = tt
+
+	s.removeTicketRef(t)
+}
+
+// nextRegisterableTicket returns the next ticket that can be used
+// to register.
+//
+// If the returned wait time <= zero the ticket can be used. For a positive
+// wait time, the caller should requery the next ticket later.
+//
+// A ticket can be returned more than once with <= zero wait time in case
+// the ticket contains multiple topics.
+func (s *ticketStore) nextRegisterableTicket() (t *ticketRef, wait time.Duration) {
+	defer func() {
+		if t == nil {
+			debugLog(" nil")
+		} else {
+			debugLog(fmt.Sprintf(" node = %x sn = %v wait = %v", t.t.node.ID[:8], t.t.serial, wait))
+		}
+	}()
+
+	debugLog("nextRegisterableTicket()")
+	now := monotonicTime()
+	if s.nextTicketCached != nil {
+		return s.nextTicketCached, time.Duration(s.nextTicketCached.topicRegTime() - now)
+	}
+
+	for bucket := s.lastBucketFetched; ; bucket++ {
+		var (
+			empty      = true    // true if there are no tickets
+			nextTicket ticketRef // uninitialized if this bucket is empty
+		)
+		for _, tickets := range s.tickets {
+			//s.removeExcessTickets(topic)
+			if len(tickets.buckets) != 0 {
+				empty = false
+				if list := tickets.buckets[bucket]; list != nil {
+					for _, ref := range list {
+						//debugLog(fmt.Sprintf(" nrt bucket = %d node = %x sn = %v wait = %v", bucket, ref.t.node.ID[:8], ref.t.serial, time.Duration(ref.topicRegTime()-now)))
+						if nextTicket.t == nil || ref.topicRegTime() < nextTicket.topicRegTime() {
+							nextTicket = ref
+						}
+					}
+				}
+			}
+		}
+		if empty {
+			return nil, 0
+		}
+		if nextTicket.t != nil {
+			wait = time.Duration(nextTicket.topicRegTime() - now)
+			s.nextTicketCached = &nextTicket
+			return &nextTicket, wait
+		}
+		s.lastBucketFetched = bucket
+	}
+}
+
+// removeTicket removes a ticket from the ticket store
+func (s *ticketStore) removeTicketRef(ref ticketRef) {
+	debugLog(fmt.Sprintf("removeTicketRef(node = %x sn = %v)", ref.t.node.ID[:8], ref.t.serial))
+	topic := ref.topic()
+	tickets := s.tickets[topic].buckets
+	if tickets == nil {
+		return
+	}
+	bucket := timeBucket(ref.t.regTime[ref.idx] / absTime(ticketTimeBucketLen))
+	list := tickets[bucket]
+	idx := -1
+	for i, bt := range list {
+		if bt.t == ref.t {
+			idx = i
+			break
+		}
+	}
+	if idx == -1 {
+		panic(nil)
+	}
+	list = append(list[:idx], list[idx+1:]...)
+	if len(list) != 0 {
+		tickets[bucket] = list
+	} else {
+		delete(tickets, bucket)
+	}
+	ref.t.refCnt--
+	if ref.t.refCnt == 0 {
+		delete(s.nodes, ref.t.node)
+		delete(s.nodeLastReq, ref.t.node)
+	}
+
+	// Make nextRegisterableTicket return the next available ticket.
+	s.nextTicketCached = nil
+}
+
+type lookupInfo struct {
+	target common.Hash
+	topic  Topic
+}
+
+type reqInfo struct {
+	pingHash []byte
+	topic    Topic
+}
+
+// returns -1 if not found
+func (t *ticket) findIdx(topic Topic) int {
+	for i, tt := range t.topics {
+		if tt == topic {
+			return i
+		}
+	}
+	return -1
+}
+
+func (s *ticketStore) registerLookupDone(lookup lookupInfo, nodes []*Node, ping func(n *Node) []byte) {
+	now := monotonicTime()
+	//fmt.Printf("registerLookupDone  target = %016x\n", target[:8])
+	if len(nodes) > 0 {
+		s.adjustMinRadius(lookup.target, nodes[0].sha)
+	}
+	for i, n := range nodes {
+		if i == 0 || (binary.BigEndian.Uint64(n.sha[:8])^binary.BigEndian.Uint64(lookup.target[:8])) < s.minRadius {
+			if t := s.nodes[n]; t != nil {
+				// adjust radius with already stored ticket
+				if idx := t.findIdx(lookup.topic); idx != -1 {
+					s.adjustWithTicket(now, t, idx, false)
+				}
+			} else {
+				// request a new pong packet
+				s.nodeLastReq[n] = reqInfo{pingHash: ping(n), topic: lookup.topic}
+			}
+		}
+	}
+}
+
+func (s *ticketStore) adjustWithTicket(localTime absTime, t *ticket, idx int, onlyConverging bool) {
+	if onlyConverging {
+		for i, topic := range t.topics {
+			if tt, ok := s.radius[topic]; ok && !tt.converged && tt.isInRadius(t, true) {
+				tt.adjust(localTime, ticketRef{t, i}, s.minRadius, s.minRadCnt >= minRadStableAfter)
+				debugLog(fmt.Sprintf("adjust converging topic: %v, rad: %v, cd: %v, converged: %v", topic, float64(tt.radius)/maxRadius, tt.adjustCooldown, tt.converged))
+			}
+		}
+	} else {
+		topic := t.topics[idx]
+		if tt, ok := s.radius[topic]; ok && tt.isInRadius(t, true) {
+			tt.adjust(localTime, ticketRef{t, idx}, s.minRadius, s.minRadCnt >= minRadStableAfter)
+			debugLog(fmt.Sprintf("adjust topic: %v, rad: %v, cd: %v, converged: %v", topic, float64(tt.radius)/maxRadius, tt.adjustCooldown, tt.converged))
+		}
+	}
+}
+
+func (s *ticketStore) addTicket(localTime absTime, pingHash []byte, t *ticket) {
+	debugLog(fmt.Sprintf("add(node = %x sn = %v)", t.node.ID[:8], t.serial))
+
+	if s.nodes[t.node] != nil {
+		return
+	}
+
+	lastReq, ok := s.nodeLastReq[t.node]
+	if !(ok && bytes.Equal(pingHash, lastReq.pingHash)) {
+		s.adjustWithTicket(localTime, t, -1, true)
+		return
+	}
+	topic := lastReq.topic
+	topicIdx := t.findIdx(topic)
+	if topicIdx == -1 {
+		return
+	}
+
+	s.adjustWithTicket(localTime, t, topicIdx, false)
+	bucket := timeBucket(localTime / absTime(ticketTimeBucketLen))
+	if s.lastBucketFetched == 0 || bucket < s.lastBucketFetched {
+		s.lastBucketFetched = bucket
+	}
+
+	for topicIdx, topic := range t.topics {
+		if tt, ok := s.radius[topic]; ok && tt.isInRadius(t, false) {
+			if _, ok := s.tickets[topic]; ok && tt.converged {
+				wait := t.regTime[topicIdx] - localTime
+				rnd := rand.ExpFloat64()
+				if rnd > 10 {
+					rnd = 10
+				}
+				if float64(wait) < float64(keepTicketConst)+float64(keepTicketExp)*rnd {
+					// use the ticket to register this topic
+					s.addTicketRef(ticketRef{t, topicIdx})
+				}
+			}
+		}
+	}
+
+	if t.refCnt > 0 {
+		s.nextTicketCached = nil
+		s.nodes[t.node] = t
+	}
+}
+
+func (s *ticketStore) getNodeTicket(node *Node) *ticket {
+	if s.nodes[node] == nil {
+		debugLog(fmt.Sprintf("getNodeTicket(%x) sn = nil", node.ID[:8]))
+	} else {
+		debugLog(fmt.Sprintf("getNodeTicket(%x) sn = %v", node.ID[:8], s.nodes[node].serial))
+	}
+	return s.nodes[node]
+}
+
+func (s *ticketStore) adjustMinRadius(target, found common.Hash) {
+	tp := binary.BigEndian.Uint64(target[0:8])
+	fp := binary.BigEndian.Uint64(found[0:8])
+	dist := tp ^ fp
+
+	var mr uint64
+	if dist < maxRadius/16 {
+		mr = dist * 16
+	} else {
+		mr = maxRadius
+	}
+	mr /= minRadAverage
+
+	s.minRadSum -= s.lastMinRads[s.minRadPtr]
+	s.lastMinRads[s.minRadPtr] = mr
+	s.minRadSum += mr
+	s.minRadPtr++
+	if s.minRadPtr == minRadAverage {
+		s.minRadPtr = 0
+	}
+	s.minRadCnt++
+
+	if s.minRadCnt < minRadAverage {
+		s.minRadius = (s.minRadSum / s.minRadCnt) * minRadAverage
+	} else {
+		s.minRadius = s.minRadSum
+	}
+	debugLog(fmt.Sprintf("adjustMinRadius() %v", float64(s.minRadius)/maxRadius))
+}
+
+type topicRadius struct {
+	topic           Topic
+	topicHashPrefix uint64
+	radius          uint64
+	adjustCooldown  float64 // only for convergence detection
+	converged       bool
+	intExtBalance   float64
+}
+
+func newTopicRadius(t Topic) *topicRadius {
+	topicHash := crypto.Keccak256Hash([]byte(t))
+	topicHashPrefix := binary.BigEndian.Uint64(topicHash[0:8])
+
+	return &topicRadius{
+		topic:           t,
+		topicHashPrefix: topicHashPrefix,
+		radius:          maxRadius,
+		adjustCooldown:  adjustCooldownStart,
+		converged:       false,
+	}
+}
+
+func (r *topicRadius) isInRadius(t *ticket, extRadius bool) bool {
+	nodePrefix := binary.BigEndian.Uint64(t.node.sha[0:8])
+	dist := nodePrefix ^ r.topicHashPrefix
+	if extRadius {
+		return float64(dist) < float64(r.radius)*radiusExtendRatio
+	}
+	return dist < r.radius
+}
+
+func randUint64n(n uint64) uint64 { // don't care about lowest bit, 63 bit randomness is more than enough
+	if n < 4 {
+		return 0
+	}
+	return uint64(rand.Int63n(int64(n/2))) * 2
+}
+
+func (r *topicRadius) nextTarget() common.Hash {
+	var rnd uint64
+	if r.intExtBalance < 0 {
+		// select target from inner region
+		rnd = randUint64n(r.radius)
+	} else {
+		// select target from outer region
+		e := float64(r.radius) * radiusExtendRatio
+		extRadius := uint64(maxRadius)
+		if e < maxRadius {
+			extRadius = uint64(e)
+		}
+		rnd = r.radius + randUint64n(extRadius-r.radius)
+	}
+	prefix := r.topicHashPrefix ^ rnd
+	var target common.Hash
+	binary.BigEndian.PutUint64(target[0:8], prefix)
+	return target
+}
+
+func (r *topicRadius) adjust(localTime absTime, t ticketRef, minRadius uint64, minRadStable bool) {
+	var balanceStep, stepSign float64
+	if r.isInRadius(t.t, false) {
+		balanceStep = radiusExtendRatio - 1
+		stepSign = 1
+	} else {
+		balanceStep = -1
+		stepSign = -1
+	}
+
+	if r.intExtBalance*stepSign > 3 {
+		return
+	}
+	r.intExtBalance += balanceStep
+
+	wait := t.t.regTime[t.idx] - t.t.issueTime // localTime
+	adjust := (float64(wait)/float64(targetWaitTime) - 1) * 2
+	if adjust > 1 {
+		adjust = 1
+	}
+	if adjust < -1 {
+		adjust = -1
+	}
+	/*var adjust float64
+	if wait > absTime(targetWaitTime) {
+		adjust = 1
+	} else {
+		adjust = -1
+	}*/
+
+	if r.converged {
+		adjust *= adjustRatio
+	} else {
+		adjust *= r.adjustCooldown
+	}
+
+	/*if adjust > 0 {
+		adjust *= radiusExtendRatio*2 - 1
+	}*/
+
+	radius := float64(r.radius) * (1 + adjust)
+	if radius > float64(maxRadius) {
+		r.radius = maxRadius
+	} else {
+		r.radius = uint64(radius)
+		if r.radius < minRadius {
+			r.radius = minRadius
+		}
+	}
+
+	if !r.converged && (adjust > 0 || (r.radius == minRadius && minRadStable)) {
+		r.adjustCooldown *= (1 - adjustCooldownStep)
+		if r.adjustCooldown <= adjustRatio {
+			r.converged = true
+		}
+	}
+
+}
diff --git a/vendor/github.com/ethereum/go-ethereum/p2p/discv5/topic.go b/vendor/github.com/ethereum/go-ethereum/p2p/discv5/topic.go
new file mode 100644
index 000000000..caaec28b7
--- /dev/null
+++ b/vendor/github.com/ethereum/go-ethereum/p2p/discv5/topic.go
@@ -0,0 +1,399 @@
+// Copyright 2015 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package discv5
+
+import (
+	"container/heap"
+	"fmt"
+	"math"
+	"math/rand"
+	"time"
+)
+
+const (
+	maxEntries         = 10000
+	maxEntriesPerTopic = 50
+
+	fallbackRegistrationExpiry = 1 * time.Hour
+)
+
+type Topic string
+
+type topicEntry struct {
+	topic   Topic
+	fifoIdx uint64
+	node    *Node
+	expire  absTime
+}
+
+type topicInfo struct {
+	entries            map[uint64]*topicEntry
+	fifoHead, fifoTail uint64
+	rqItem             *topicRequestQueueItem
+	wcl                waitControlLoop
+}
+
+// removes tail element from the fifo
+func (t *topicInfo) getFifoTail() *topicEntry {
+	for t.entries[t.fifoTail] == nil {
+		t.fifoTail++
+	}
+	tail := t.entries[t.fifoTail]
+	t.fifoTail++
+	return tail
+}
+
+type nodeInfo struct {
+	entries                          map[Topic]*topicEntry
+	lastIssuedTicket, lastUsedTicket uint32
+	// you can't register a ticket newer than lastUsedTicket before noRegUntil (absolute time)
+	noRegUntil absTime
+}
+
+type topicTable struct {
+	db                    *nodeDB
+	self                  *Node
+	nodes                 map[*Node]*nodeInfo
+	topics                map[Topic]*topicInfo
+	globalEntries         uint64
+	requested             topicRequestQueue
+	requestCnt            uint64
+	lastGarbageCollection absTime
+}
+
+func newTopicTable(db *nodeDB, self *Node) *topicTable {
+	if printTestImgLogs {
+		fmt.Printf("*N %016x\n", self.sha[:8])
+	}
+	return &topicTable{
+		db:     db,
+		nodes:  make(map[*Node]*nodeInfo),
+		topics: make(map[Topic]*topicInfo),
+		self:   self,
+	}
+}
+
+func (t *topicTable) getOrNewTopic(topic Topic) *topicInfo {
+	ti := t.topics[topic]
+	if ti == nil {
+		rqItem := &topicRequestQueueItem{
+			topic:    topic,
+			priority: t.requestCnt,
+		}
+		ti = &topicInfo{
+			entries: make(map[uint64]*topicEntry),
+			rqItem:  rqItem,
+		}
+		t.topics[topic] = ti
+		heap.Push(&t.requested, rqItem)
+	}
+	return ti
+}
+
+func (t *topicTable) checkDeleteTopic(topic Topic) {
+	ti := t.topics[topic]
+	if ti == nil {
+		return
+	}
+	if len(ti.entries) == 0 && ti.wcl.hasMinimumWaitPeriod() {
+		delete(t.topics, topic)
+		heap.Remove(&t.requested, ti.rqItem.index)
+	}
+}
+
+func (t *topicTable) getOrNewNode(node *Node) *nodeInfo {
+	n := t.nodes[node]
+	if n == nil {
+		//fmt.Printf("newNode %016x %016x\n", t.self.sha[:8], node.sha[:8])
+		var issued, used uint32
+		if t.db != nil {
+			issued, used = t.db.fetchTopicRegTickets(node.ID)
+		}
+		n = &nodeInfo{
+			entries:          make(map[Topic]*topicEntry),
+			lastIssuedTicket: issued,
+			lastUsedTicket:   used,
+		}
+		t.nodes[node] = n
+	}
+	return n
+}
+
+func (t *topicTable) checkDeleteNode(node *Node) {
+	if n, ok := t.nodes[node]; ok && len(n.entries) == 0 && n.noRegUntil < monotonicTime() {
+		//fmt.Printf("deleteNode %016x %016x\n", t.self.sha[:8], node.sha[:8])
+		delete(t.nodes, node)
+	}
+}
+
+func (t *topicTable) storeTicketCounters(node *Node) {
+	n := t.getOrNewNode(node)
+	if t.db != nil {
+		t.db.updateTopicRegTickets(node.ID, n.lastIssuedTicket, n.lastUsedTicket)
+	}
+}
+
+func (t *topicTable) getEntries(topic Topic) []*Node {
+	t.collectGarbage()
+
+	te := t.topics[topic]
+	if te == nil {
+		return nil
+	}
+	nodes := make([]*Node, len(te.entries))
+	i := 0
+	for _, e := range te.entries {
+		nodes[i] = e.node
+		i++
+	}
+	t.requestCnt++
+	t.requested.update(te.rqItem, t.requestCnt)
+	return nodes
+}
+
+func (t *topicTable) addEntry(node *Node, topic Topic) {
+	n := t.getOrNewNode(node)
+	// clear previous entries by the same node
+	for _, e := range n.entries {
+		t.deleteEntry(e)
+	}
+	// ***
+	n = t.getOrNewNode(node)
+
+	tm := monotonicTime()
+	te := t.getOrNewTopic(topic)
+
+	if len(te.entries) == maxEntriesPerTopic {
+		t.deleteEntry(te.getFifoTail())
+	}
+
+	if t.globalEntries == maxEntries {
+		t.deleteEntry(t.leastRequested()) // not empty, no need to check for nil
+	}
+
+	fifoIdx := te.fifoHead
+	te.fifoHead++
+	entry := &topicEntry{
+		topic:   topic,
+		fifoIdx: fifoIdx,
+		node:    node,
+		expire:  tm + absTime(fallbackRegistrationExpiry),
+	}
+	if printTestImgLogs {
+		fmt.Printf("*+ %d %v %016x %016x\n", tm/1000000, topic, t.self.sha[:8], node.sha[:8])
+	}
+	te.entries[fifoIdx] = entry
+	n.entries[topic] = entry
+	t.globalEntries++
+	te.wcl.registered(tm)
+}
+
+// removes least requested element from the fifo
+func (t *topicTable) leastRequested() *topicEntry {
+	for t.requested.Len() > 0 && t.topics[t.requested[0].topic] == nil {
+		heap.Pop(&t.requested)
+	}
+	if t.requested.Len() == 0 {
+		return nil
+	}
+	return t.topics[t.requested[0].topic].getFifoTail()
+}
+
+// entry should exist
+func (t *topicTable) deleteEntry(e *topicEntry) {
+	if printTestImgLogs {
+		fmt.Printf("*- %d %v %016x %016x\n", monotonicTime()/1000000, e.topic, t.self.sha[:8], e.node.sha[:8])
+	}
+	ne := t.nodes[e.node].entries
+	delete(ne, e.topic)
+	if len(ne) == 0 {
+		t.checkDeleteNode(e.node)
+	}
+	te := t.topics[e.topic]
+	delete(te.entries, e.fifoIdx)
+	if len(te.entries) == 0 {
+		t.checkDeleteTopic(e.topic)
+	}
+	t.globalEntries--
+}
+
+// It is assumed that topics and waitPeriods have the same length.
+func (t *topicTable) useTicket(node *Node, serialNo uint32, topics []Topic, idx int, issueTime uint64, waitPeriods []uint32) (registered bool) {
+	debugLog(fmt.Sprintf("useTicket", serialNo, topics, waitPeriods))
+	t.collectGarbage()
+
+	n := t.getOrNewNode(node)
+	if serialNo < n.lastUsedTicket {
+		return false
+	}
+
+	tm := monotonicTime()
+	if serialNo > n.lastUsedTicket && tm < n.noRegUntil {
+		return false
+	}
+	if serialNo != n.lastUsedTicket {
+		n.lastUsedTicket = serialNo
+		n.noRegUntil = tm + absTime(noRegTimeout())
+		t.storeTicketCounters(node)
+	}
+
+	currTime := uint64(tm / absTime(time.Second))
+	regTime := issueTime + uint64(waitPeriods[idx])
+	relTime := int64(currTime - regTime)
+	if relTime >= -1 && relTime <= regTimeWindow+1 && // give clients a little security margin on both ends
+		n.entries[topics[idx]] == nil { // don't register again if there is an active entry
+		t.addEntry(node, topics[idx])
+		return true
+	}
+
+	return false
+}
+
+func (topictab *topicTable) getTicket(node *Node, topics []Topic) *ticket {
+	topictab.collectGarbage()
+
+	now := monotonicTime()
+	n := topictab.getOrNewNode(node)
+	n.lastIssuedTicket++
+	topictab.storeTicketCounters(node)
+
+	t := &ticket{
+		issueTime: now,
+		topics:    topics,
+		serial:    n.lastIssuedTicket,
+		regTime:   make([]absTime, len(topics)),
+	}
+	for i, topic := range topics {
+		var waitPeriod time.Duration
+		if topic := topictab.topics[topic]; topic != nil {
+			waitPeriod = topic.wcl.waitPeriod
+		} else {
+			waitPeriod = minWaitPeriod
+		}
+
+		t.regTime[i] = now + absTime(waitPeriod)
+	}
+	return t
+}
+
+const gcInterval = time.Minute
+
+func (t *topicTable) collectGarbage() {
+	tm := monotonicTime()
+	if time.Duration(tm-t.lastGarbageCollection) < gcInterval {
+		return
+	}
+	t.lastGarbageCollection = tm
+
+	for node, n := range t.nodes {
+		for _, e := range n.entries {
+			if e.expire <= tm {
+				t.deleteEntry(e)
+			}
+		}
+
+		t.checkDeleteNode(node)
+	}
+
+	for topic, _ := range t.topics {
+		t.checkDeleteTopic(topic)
+	}
+}
+
+const (
+	minWaitPeriod   = time.Minute
+	regTimeWindow   = 10 // seconds
+	avgnoRegTimeout = time.Minute * 10
+	// target average interval between two incoming ad requests
+	wcTargetRegInterval = time.Minute * 10 / maxEntriesPerTopic
+	//
+	wcTimeConst = time.Minute * 10
+)
+
+// initialization is not required, will set to minWaitPeriod at first registration
+type waitControlLoop struct {
+	lastIncoming absTime
+	waitPeriod   time.Duration
+}
+
+func (w *waitControlLoop) registered(tm absTime) {
+	w.waitPeriod = w.nextWaitPeriod(tm)
+	w.lastIncoming = tm
+}
+
+func (w *waitControlLoop) nextWaitPeriod(tm absTime) time.Duration {
+	period := tm - w.lastIncoming
+	wp := time.Duration(float64(w.waitPeriod) * math.Exp((float64(wcTargetRegInterval)-float64(period))/float64(wcTimeConst)))
+	if wp < minWaitPeriod {
+		wp = minWaitPeriod
+	}
+	return wp
+}
+
+func (w *waitControlLoop) hasMinimumWaitPeriod() bool {
+	return w.nextWaitPeriod(monotonicTime()) == minWaitPeriod
+}
+
+func noRegTimeout() time.Duration {
+	e := rand.ExpFloat64()
+	if e > 100 {
+		e = 100
+	}
+	return time.Duration(float64(avgnoRegTimeout) * e)
+}
+
+type topicRequestQueueItem struct {
+	topic    Topic
+	priority uint64
+	index    int
+}
+
+// A topicRequestQueue implements heap.Interface and holds topicRequestQueueItems.
+type topicRequestQueue []*topicRequestQueueItem
+
+func (tq topicRequestQueue) Len() int { return len(tq) }
+
+func (tq topicRequestQueue) Less(i, j int) bool {
+	return tq[i].priority < tq[j].priority
+}
+
+func (tq topicRequestQueue) Swap(i, j int) {
+	tq[i], tq[j] = tq[j], tq[i]
+	tq[i].index = i
+	tq[j].index = j
+}
+
+func (tq *topicRequestQueue) Push(x interface{}) {
+	n := len(*tq)
+	item := x.(*topicRequestQueueItem)
+	item.index = n
+	*tq = append(*tq, item)
+}
+
+func (tq *topicRequestQueue) Pop() interface{} {
+	old := *tq
+	n := len(old)
+	item := old[n-1]
+	item.index = -1
+	*tq = old[0 : n-1]
+	return item
+}
+
+func (tq *topicRequestQueue) update(item *topicRequestQueueItem, priority uint64) {
+	item.priority = priority
+	heap.Fix(tq, item.index)
+}
diff --git a/vendor/github.com/ethereum/go-ethereum/p2p/discv5/udp.go b/vendor/github.com/ethereum/go-ethereum/p2p/discv5/udp.go
new file mode 100644
index 000000000..bc8a5dd7c
--- /dev/null
+++ b/vendor/github.com/ethereum/go-ethereum/p2p/discv5/udp.go
@@ -0,0 +1,449 @@
+// Copyright 2015 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package discv5
+
+import (
+	"bytes"
+	"crypto/ecdsa"
+	"errors"
+	"fmt"
+	"net"
+	"time"
+
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/crypto"
+	"github.com/ethereum/go-ethereum/logger"
+	"github.com/ethereum/go-ethereum/logger/glog"
+	"github.com/ethereum/go-ethereum/p2p/nat"
+	"github.com/ethereum/go-ethereum/rlp"
+)
+
+const Version = 4
+
+// Errors
+var (
+	errPacketTooSmall   = errors.New("too small")
+	errBadHash          = errors.New("bad hash")
+	errExpired          = errors.New("expired")
+	errUnsolicitedReply = errors.New("unsolicited reply")
+	errUnknownNode      = errors.New("unknown node")
+	errTimeout          = errors.New("RPC timeout")
+	errClockWarp        = errors.New("reply deadline too far in the future")
+	errClosed           = errors.New("socket closed")
+)
+
+// Timeouts
+const (
+	respTimeout = 500 * time.Millisecond
+	sendTimeout = 500 * time.Millisecond
+	expiration  = 20 * time.Second
+
+	ntpFailureThreshold = 32               // Continuous timeouts after which to check NTP
+	ntpWarningCooldown  = 10 * time.Minute // Minimum amount of time to pass before repeating NTP warning
+	driftThreshold      = 10 * time.Second // Allowed clock drift before warning user
+)
+
+// RPC request structures
+type (
+	ping struct {
+		Version    uint
+		From, To   rpcEndpoint
+		Expiration uint64
+
+		// v5
+		Topics []Topic
+
+		// Ignore additional fields (for forward compatibility).
+		Rest []rlp.RawValue `rlp:"tail"`
+	}
+
+	// pong is the reply to ping.
+	pong struct {
+		// This field should mirror the UDP envelope address
+		// of the ping packet, which provides a way to discover the
+		// the external address (after NAT).
+		To rpcEndpoint
+
+		ReplyTok   []byte // This contains the hash of the ping packet.
+		Expiration uint64 // Absolute timestamp at which the packet becomes invalid.
+
+		// v5
+		TopicHash    common.Hash
+		TicketSerial uint32
+		WaitPeriods  []uint32
+
+		// Ignore additional fields (for forward compatibility).
+		Rest []rlp.RawValue `rlp:"tail"`
+	}
+
+	// findnode is a query for nodes close to the given target.
+	findnode struct {
+		Target     NodeID // doesn't need to be an actual public key
+		Expiration uint64
+		// Ignore additional fields (for forward compatibility).
+		Rest []rlp.RawValue `rlp:"tail"`
+	}
+
+	// findnode is a query for nodes close to the given target.
+	findnodeHash struct {
+		Target     common.Hash
+		Expiration uint64
+		// Ignore additional fields (for forward compatibility).
+		Rest []rlp.RawValue `rlp:"tail"`
+	}
+
+	// reply to findnode
+	neighbors struct {
+		Nodes      []rpcNode
+		Expiration uint64
+		// Ignore additional fields (for forward compatibility).
+		Rest []rlp.RawValue `rlp:"tail"`
+	}
+
+	topicRegister struct {
+		Topics []Topic
+		Idx    int
+		Pong   []byte
+	}
+
+	topicQuery struct {
+		Topic      Topic
+		Expiration uint64
+	}
+
+	// reply to topicQuery
+	topicNodes struct {
+		Echo  common.Hash
+		Nodes []rpcNode
+	}
+
+	rpcNode struct {
+		IP  net.IP // len 4 for IPv4 or 16 for IPv6
+		UDP uint16 // for discovery protocol
+		TCP uint16 // for RLPx protocol
+		ID  NodeID
+	}
+
+	rpcEndpoint struct {
+		IP  net.IP // len 4 for IPv4 or 16 for IPv6
+		UDP uint16 // for discovery protocol
+		TCP uint16 // for RLPx protocol
+	}
+)
+
+const (
+	macSize  = 256 / 8
+	sigSize  = 520 / 8
+	headSize = macSize + sigSize // space of packet frame data
+)
+
+// Neighbors replies are sent across multiple packets to
+// stay below the 1280 byte limit. We compute the maximum number
+// of entries by stuffing a packet until it grows too large.
+var maxNeighbors = func() int {
+	p := neighbors{Expiration: ^uint64(0)}
+	maxSizeNode := rpcNode{IP: make(net.IP, 16), UDP: ^uint16(0), TCP: ^uint16(0)}
+	for n := 0; ; n++ {
+		p.Nodes = append(p.Nodes, maxSizeNode)
+		size, _, err := rlp.EncodeToReader(p)
+		if err != nil {
+			// If this ever happens, it will be caught by the unit tests.
+			panic("cannot encode: " + err.Error())
+		}
+		if headSize+size+1 >= 1280 {
+			return n
+		}
+	}
+}()
+
+var maxTopicNodes = func() int {
+	p := topicNodes{}
+	maxSizeNode := rpcNode{IP: make(net.IP, 16), UDP: ^uint16(0), TCP: ^uint16(0)}
+	for n := 0; ; n++ {
+		p.Nodes = append(p.Nodes, maxSizeNode)
+		size, _, err := rlp.EncodeToReader(p)
+		if err != nil {
+			// If this ever happens, it will be caught by the unit tests.
+			panic("cannot encode: " + err.Error())
+		}
+		if headSize+size+1 >= 1280 {
+			return n
+		}
+	}
+}()
+
+func makeEndpoint(addr *net.UDPAddr, tcpPort uint16) rpcEndpoint {
+	ip := addr.IP.To4()
+	if ip == nil {
+		ip = addr.IP.To16()
+	}
+	return rpcEndpoint{IP: ip, UDP: uint16(addr.Port), TCP: tcpPort}
+}
+
+func (e1 rpcEndpoint) equal(e2 rpcEndpoint) bool {
+	return e1.UDP == e2.UDP && e1.TCP == e2.TCP && bytes.Equal(e1.IP, e2.IP)
+}
+
+func nodeFromRPC(rn rpcNode) (*Node, error) {
+	// TODO: don't accept localhost, LAN addresses from internet hosts
+	n := NewNode(rn.ID, rn.IP, rn.UDP, rn.TCP)
+	err := n.validateComplete()
+	return n, err
+}
+
+func nodeToRPC(n *Node) rpcNode {
+	return rpcNode{ID: n.ID, IP: n.IP, UDP: n.UDP, TCP: n.TCP}
+}
+
+type ingressPacket struct {
+	remoteID   NodeID
+	remoteAddr *net.UDPAddr
+	ev         nodeEvent
+	hash       []byte
+	data       interface{} // one of the RPC structs
+	rawData    []byte
+}
+
+type conn interface {
+	ReadFromUDP(b []byte) (n int, addr *net.UDPAddr, err error)
+	WriteToUDP(b []byte, addr *net.UDPAddr) (n int, err error)
+	Close() error
+	LocalAddr() net.Addr
+}
+
+// udp implements the RPC protocol.
+type udp struct {
+	conn        conn
+	priv        *ecdsa.PrivateKey
+	ourEndpoint rpcEndpoint
+	nat         nat.Interface
+	net         *Network
+}
+
+// ListenUDP returns a new table that listens for UDP packets on laddr.
+func ListenUDP(priv *ecdsa.PrivateKey, laddr string, natm nat.Interface, nodeDBPath string) (*Network, error) {
+	transport, err := listenUDP(priv, laddr)
+	if err != nil {
+		return nil, err
+	}
+	net, err := newNetwork(transport, priv.PublicKey, natm, nodeDBPath)
+	if err != nil {
+		return nil, err
+	}
+	transport.net = net
+	go transport.readLoop()
+	return net, nil
+}
+
+func listenUDP(priv *ecdsa.PrivateKey, laddr string) (*udp, error) {
+	addr, err := net.ResolveUDPAddr("udp", laddr)
+	if err != nil {
+		return nil, err
+	}
+	conn, err := net.ListenUDP("udp", addr)
+	if err != nil {
+		return nil, err
+	}
+	return &udp{conn: conn, priv: priv}, nil
+}
+
+func (t *udp) localAddr() *net.UDPAddr {
+	return t.conn.LocalAddr().(*net.UDPAddr)
+}
+
+func (t *udp) Close() {
+	t.conn.Close()
+}
+
+func (t *udp) send(remote *Node, ptype nodeEvent, data interface{}) {
+	t.sendPacket(remote.ID, remote.addr(), byte(ptype), data)
+}
+
+func (t *udp) sendPing(remote *Node, toaddr *net.UDPAddr, topics []Topic) (hash []byte) {
+	hash, _ = t.sendPacket(remote.ID, toaddr, byte(pingPacket), ping{
+		Version:    Version,
+		From:       t.ourEndpoint,
+		To:         makeEndpoint(toaddr, 0), // TODO: maybe use known TCP port from DB
+		Expiration: uint64(time.Now().Add(expiration).Unix()),
+		Topics:     topics,
+	})
+	return hash
+}
+
+func (t *udp) sendFindnode(remote *Node, target NodeID) {
+	t.sendPacket(remote.ID, remote.addr(), byte(findnodePacket), findnode{
+		Target:     target,
+		Expiration: uint64(time.Now().Add(expiration).Unix()),
+	})
+}
+
+func (t *udp) sendNeighbours(remote *Node, results []*Node) {
+	// Send neighbors in chunks with at most maxNeighbors per packet
+	// to stay below the 1280 byte limit.
+	p := neighbors{Expiration: uint64(time.Now().Add(expiration).Unix())}
+	for i, result := range results {
+		p.Nodes = append(p.Nodes, nodeToRPC(result))
+		if len(p.Nodes) == maxNeighbors || i == len(results)-1 {
+			t.sendPacket(remote.ID, remote.addr(), byte(neighborsPacket), p)
+			p.Nodes = p.Nodes[:0]
+		}
+	}
+}
+
+func (t *udp) sendFindnodeHash(remote *Node, target common.Hash) {
+	t.sendPacket(remote.ID, remote.addr(), byte(findnodeHashPacket), findnodeHash{
+		Target:     target,
+		Expiration: uint64(time.Now().Add(expiration).Unix()),
+	})
+}
+
+func (t *udp) sendTopicRegister(remote *Node, topics []Topic, idx int, pong []byte) {
+	t.sendPacket(remote.ID, remote.addr(), byte(topicRegisterPacket), topicRegister{
+		Topics: topics,
+		Idx:    idx,
+		Pong:   pong,
+	})
+}
+
+func (t *udp) sendTopicNodes(remote *Node, queryHash common.Hash, nodes []*Node) {
+	p := topicNodes{Echo: queryHash}
+	for i, result := range nodes {
+		p.Nodes = append(p.Nodes, nodeToRPC(result))
+		if len(p.Nodes) == maxTopicNodes || i == len(nodes)-1 {
+			t.sendPacket(remote.ID, remote.addr(), byte(neighborsPacket), p)
+			p.Nodes = p.Nodes[:0]
+		}
+	}
+}
+
+func (t *udp) sendPacket(toid NodeID, toaddr *net.UDPAddr, ptype byte, req interface{}) (hash []byte, err error) {
+	packet, hash, err := encodePacket(t.priv, ptype, req)
+	if err != nil {
+		return hash, err
+	}
+	glog.V(logger.Detail).Infof(">>> %v to %x@%v\n", nodeEvent(ptype), toid[:8], toaddr)
+	if _, err = t.conn.WriteToUDP(packet, toaddr); err != nil {
+		glog.V(logger.Detail).Infoln("UDP send failed:", err)
+	}
+	return hash, err
+}
+
+// zeroed padding space for encodePacket.
+var headSpace = make([]byte, headSize)
+
+func encodePacket(priv *ecdsa.PrivateKey, ptype byte, req interface{}) (p, hash []byte, err error) {
+	b := new(bytes.Buffer)
+	b.Write(headSpace)
+	b.WriteByte(ptype)
+	if err := rlp.Encode(b, req); err != nil {
+		glog.V(logger.Error).Infoln("error encoding packet:", err)
+		return nil, nil, err
+	}
+	packet := b.Bytes()
+	sig, err := crypto.Sign(crypto.Keccak256(packet[headSize:]), priv)
+	if err != nil {
+		glog.V(logger.Error).Infoln("could not sign packet:", err)
+		return nil, nil, err
+	}
+	copy(packet[macSize:], sig)
+	// add the hash to the front. Note: this doesn't protect the
+	// packet in any way.
+	hash = crypto.Keccak256(packet[macSize:])
+	copy(packet, hash)
+	return packet, hash, nil
+}
+
+// readLoop runs in its own goroutine. it injects ingress UDP packets
+// into the network loop.
+func (t *udp) readLoop() {
+	defer t.conn.Close()
+	// Discovery packets are defined to be no larger than 1280 bytes.
+	// Packets larger than this size will be cut at the end and treated
+	// as invalid because their hash won't match.
+	buf := make([]byte, 1280)
+	for {
+		nbytes, from, err := t.conn.ReadFromUDP(buf)
+		if isTemporaryError(err) {
+			// Ignore temporary read errors.
+			glog.V(logger.Debug).Infof("Temporary read error: %v", err)
+			continue
+		} else if err != nil {
+			// Shut down the loop for permament errors.
+			glog.V(logger.Debug).Infof("Read error: %v", err)
+			return
+		}
+		t.handlePacket(from, buf[:nbytes])
+	}
+}
+
+func isTemporaryError(err error) bool {
+	tempErr, ok := err.(interface {
+		Temporary() bool
+	})
+	return ok && tempErr.Temporary() || isPacketTooBig(err)
+}
+
+func (t *udp) handlePacket(from *net.UDPAddr, buf []byte) error {
+	pkt := ingressPacket{remoteAddr: from}
+	if err := decodePacket(buf, &pkt); err != nil {
+		glog.V(logger.Debug).Infof("Bad packet from %v: %v\n", from, err)
+		return err
+	}
+	t.net.reqReadPacket(pkt)
+	return nil
+}
+
+func decodePacket(buf []byte, pkt *ingressPacket) error {
+	if len(buf) < headSize+1 {
+		return errPacketTooSmall
+	}
+	hash, sig, sigdata := buf[:macSize], buf[macSize:headSize], buf[headSize:]
+	shouldhash := crypto.Keccak256(buf[macSize:])
+	if !bytes.Equal(hash, shouldhash) {
+		return errBadHash
+	}
+	fromID, err := recoverNodeID(crypto.Keccak256(buf[headSize:]), sig)
+	if err != nil {
+		return err
+	}
+	pkt.rawData = buf
+	pkt.hash = hash
+	pkt.remoteID = fromID
+	switch pkt.ev = nodeEvent(sigdata[0]); pkt.ev {
+	case pingPacket:
+		pkt.data = new(ping)
+	case pongPacket:
+		pkt.data = new(pong)
+	case findnodePacket:
+		pkt.data = new(findnode)
+	case neighborsPacket:
+		pkt.data = new(neighbors)
+	case findnodeHashPacket:
+		pkt.data = new(findnodeHash)
+	case topicRegisterPacket:
+		pkt.data = new(topicRegister)
+	case topicQueryPacket:
+		pkt.data = new(topicQuery)
+	case topicNodesPacket:
+		pkt.data = new(topicNodes)
+	default:
+		return fmt.Errorf("unknown packet type: %d", sigdata[0])
+	}
+	s := rlp.NewStream(bytes.NewReader(sigdata[1:]), 0)
+	err = s.Decode(pkt.data)
+	return err
+}
diff --git a/vendor/github.com/ethereum/go-ethereum/p2p/discv5/udp_notwindows.go b/vendor/github.com/ethereum/go-ethereum/p2p/discv5/udp_notwindows.go
new file mode 100644
index 000000000..4da18d0f6
--- /dev/null
+++ b/vendor/github.com/ethereum/go-ethereum/p2p/discv5/udp_notwindows.go
@@ -0,0 +1,26 @@
+// Copyright 2016 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+//+build !windows
+
+package discv5
+
+// reports whether err indicates that a UDP packet didn't
+// fit the receive buffer. There is no such error on
+// non-Windows platforms.
+func isPacketTooBig(err error) bool {
+	return false
+}
diff --git a/vendor/github.com/ethereum/go-ethereum/p2p/discv5/udp_windows.go b/vendor/github.com/ethereum/go-ethereum/p2p/discv5/udp_windows.go
new file mode 100644
index 000000000..1ab9d655e
--- /dev/null
+++ b/vendor/github.com/ethereum/go-ethereum/p2p/discv5/udp_windows.go
@@ -0,0 +1,40 @@
+// Copyright 2016 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+//+build windows
+
+package discv5
+
+import (
+	"net"
+	"os"
+	"syscall"
+)
+
+const _WSAEMSGSIZE = syscall.Errno(10040)
+
+// reports whether err indicates that a UDP packet didn't
+// fit the receive buffer. On Windows, WSARecvFrom returns
+// code WSAEMSGSIZE and no data if this happens.
+func isPacketTooBig(err error) bool {
+	if opErr, ok := err.(*net.OpError); ok {
+		if scErr, ok := opErr.Err.(*os.SyscallError); ok {
+			return scErr.Err == _WSAEMSGSIZE
+		}
+		return opErr.Err == _WSAEMSGSIZE
+	}
+	return false
+}
diff --git a/vendor/github.com/ethereum/go-ethereum/p2p/server.go b/vendor/github.com/ethereum/go-ethereum/p2p/server.go
index 8e3cd93f9..8e874f533 100644
--- a/vendor/github.com/ethereum/go-ethereum/p2p/server.go
+++ b/vendor/github.com/ethereum/go-ethereum/p2p/server.go
@@ -28,6 +28,7 @@ import (
 	"github.com/ethereum/go-ethereum/logger"
 	"github.com/ethereum/go-ethereum/logger/glog"
 	"github.com/ethereum/go-ethereum/p2p/discover"
+	"github.com/ethereum/go-ethereum/p2p/discv5"
 	"github.com/ethereum/go-ethereum/p2p/nat"
 )
 
@@ -72,6 +73,8 @@ type Config struct {
 	// or not. Disabling is usually useful for protocol debugging (manual topology).
 	Discovery bool
 
+	DiscoveryV5 bool
+
 	// Name sets the node name of this server.
 	// Use common.MakeName to create a name that follows existing conventions.
 	Name string
@@ -105,6 +108,8 @@ type Config struct {
 	// the server is started.
 	ListenAddr string
 
+	ListenAddrV5 string
+
 	// If set to a non-nil value, the given NAT port mapper
 	// is used to make the listening port available to the
 	// Internet.
@@ -352,6 +357,17 @@ func (srv *Server) Start() (err error) {
 		srv.ntab = ntab
 	}
 
+	if srv.DiscoveryV5 {
+		ntab, err := discv5.ListenUDP(srv.PrivateKey, srv.ListenAddrV5, srv.NAT, "") //srv.NodeDatabase)
+		if err != nil {
+			return err
+		}
+		if err := ntab.SetFallbackNodes(discv5.BootNodes); err != nil {
+			return err
+		}
+		//srv.ntab = ntab
+	}
+
 	dynPeers := (srv.MaxPeers + 1) / 2
 	if !srv.Discovery {
 		dynPeers = 0
diff --git a/vendor/github.com/ethereum/go-ethereum/params/gas_table.go b/vendor/github.com/ethereum/go-ethereum/params/gas_table.go
new file mode 100644
index 000000000..98f00a7ee
--- /dev/null
+++ b/vendor/github.com/ethereum/go-ethereum/params/gas_table.go
@@ -0,0 +1,65 @@
+// Copyright 2016 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package params
+
+import "math/big"
+
+type GasTable struct {
+	ExtcodeSize *big.Int
+	ExtcodeCopy *big.Int
+	Balance     *big.Int
+	SLoad       *big.Int
+	Calls       *big.Int
+	Suicide     *big.Int
+
+	// CreateBySuicide occurs when the
+	// refunded account is one that does
+	// not exist. This logic is similar
+	// to call. May be left nil. Nil means
+	// not charged.
+	CreateBySuicide *big.Int
+}
+
+var (
+	// GasTableHomestead contain the gas prices for
+	// the homestead phase.
+	GasTableHomestead = GasTable{
+		ExtcodeSize: big.NewInt(20),
+		ExtcodeCopy: big.NewInt(20),
+		Balance:     big.NewInt(20),
+		SLoad:       big.NewInt(50),
+		Calls:       big.NewInt(40),
+		Suicide:     big.NewInt(0),
+
+		// explicitly set to nil to indicate
+		// this rule does not apply to homestead.
+		CreateBySuicide: nil,
+	}
+
+	// GasTableHomestead contain the gas re-prices for
+	// the homestead phase.
+	GasTableHomesteadGasRepriceFork = GasTable{
+		ExtcodeSize: big.NewInt(700),
+		ExtcodeCopy: big.NewInt(700),
+		Balance:     big.NewInt(400),
+		SLoad:       big.NewInt(200),
+		Calls:       big.NewInt(700),
+		Suicide:     big.NewInt(5000),
+
+		CreateBySuicide: big.NewInt(25000),
+	}
+)
diff --git a/vendor/github.com/ethereum/go-ethereum/params/protocol_params.go b/vendor/github.com/ethereum/go-ethereum/params/protocol_params.go
index 2dfc251b6..5079eb111 100644
--- a/vendor/github.com/ethereum/go-ethereum/params/protocol_params.go
+++ b/vendor/github.com/ethereum/go-ethereum/params/protocol_params.go
@@ -71,4 +71,5 @@ var (
 	SuicideRefundGas     = big.NewInt(24000)  // Refunded following a suicide operation.
 	MemoryGas            = big.NewInt(3)      // Times the address of the (highest referenced byte in memory + 1). NOTE: referencing happens on read, write and in instructions such as RETURN and CALL.
 	TxDataNonZeroGas     = big.NewInt(68)     // Per byte of data attached to a transaction that is not equal to zero. NOTE: Not payable on data of calls between transactions.
+
 )
diff --git a/vendor/github.com/ethereum/go-ethereum/params/util.go b/vendor/github.com/ethereum/go-ethereum/params/util.go
index 9d1fa54e6..583cf03bb 100644
--- a/vendor/github.com/ethereum/go-ethereum/params/util.go
+++ b/vendor/github.com/ethereum/go-ethereum/params/util.go
@@ -19,6 +19,8 @@ package params
 import "math/big"
 
 var (
-	TestNetHomesteadBlock = big.NewInt(494000)  // Testnet homestead block
-	MainNetHomesteadBlock = big.NewInt(1150000) // Mainnet homestead block
+	TestNetHomesteadBlock           = big.NewInt(494000)  // Testnet homestead block
+	MainNetHomesteadBlock           = big.NewInt(1150000) // Mainnet homestead block
+	TestNetHomesteadGasRepriceBlock = big.NewInt(1783000) // Test net gas reprice block
+	MainNetHomesteadGasRepriceBlock = big.NewInt(2463000) // Main net gas reprice block
 )
diff --git a/vendor/github.com/ethereum/go-ethereum/rpc/server.go b/vendor/github.com/ethereum/go-ethereum/rpc/server.go
index f7dddded7..996c63700 100644
--- a/vendor/github.com/ethereum/go-ethereum/rpc/server.go
+++ b/vendor/github.com/ethereum/go-ethereum/rpc/server.go
@@ -337,13 +337,7 @@ func (s *Server) exec(ctx context.Context, codec ServerCodec, req *serverRequest
 	if req.err != nil {
 		response = codec.CreateErrorResponse(&req.id, req.err)
 	} else {
-/*fmt.Println()
-fmt.Println("SREQ")
-fmt.Println(*req)*/
 		response, callback = s.handle(ctx, codec, req)
-/*fmt.Println("RESP")
-fmt.Println(response)
-fmt.Println()*/
 	}
 
 	if err := codec.Write(response); err != nil {
@@ -367,15 +361,9 @@ func (s *Server) execBatch(ctx context.Context, codec ServerCodec, requests []*s
 			responses[i] = codec.CreateErrorResponse(&req.id, req.err)
 		} else {
 			var callback func()
-/*fmt.Println()
-fmt.Println("SREQ batch")
-fmt.Println(*req)*/
 			if responses[i], callback = s.handle(ctx, codec, req); callback != nil {
 				callbacks = append(callbacks, callback)
 			}
-/*fmt.Println("RESP")
-fmt.Println(responses[i])
-fmt.Println()*/
 		}
 	}
 
@@ -403,10 +391,6 @@ func (s *Server) readRequest(codec ServerCodec) ([]*serverRequest, bool, Error)
 
 	// verify requests
 	for i, r := range reqs {
-/*fmt.Println()
-fmt.Println(time.Now())
-fmt.Println("REQ")
-fmt.Println(r)*/
 		var ok bool
 		var svc *service
 
diff --git a/vendor/github.com/ethereum/go-ethereum/rpc/types.go b/vendor/github.com/ethereum/go-ethereum/rpc/types.go
index f435b0eca..ebe388373 100644
--- a/vendor/github.com/ethereum/go-ethereum/rpc/types.go
+++ b/vendor/github.com/ethereum/go-ethereum/rpc/types.go
@@ -302,32 +302,3 @@ func (b *HexBytes) UnmarshalJSON(input []byte) error {
 	_, err := hex.Decode(*b, input)
 	return err
 }
-
-type ClientRestartWrapper struct {
-	client      *Client
-	newClientFn func() *Client
-	mu          sync.RWMutex
-}
-
-func NewClientRestartWrapper(newClientFn func() *Client) *ClientRestartWrapper {
-	return &ClientRestartWrapper{
-		client:      newClientFn(),
-		newClientFn: newClientFn,
-	}
-}
-
-func (rw *ClientRestartWrapper) Client() *Client {
-	rw.mu.RLock()
-	defer rw.mu.RUnlock()
-
-	return rw.client
-}
-
-func (rw *ClientRestartWrapper) Restart() {
-	rw.mu.Lock()
-	defer rw.mu.Unlock()
-
-	rw.client.Close()
-	rw.client = rw.newClientFn()
-}
-
diff --git a/vendor/github.com/ethereum/go-ethereum/swarm/storage/chunker.go b/vendor/github.com/ethereum/go-ethereum/swarm/storage/chunker.go
index 4c8551da9..c0f950de5 100644
--- a/vendor/github.com/ethereum/go-ethereum/swarm/storage/chunker.go
+++ b/vendor/github.com/ethereum/go-ethereum/swarm/storage/chunker.go
@@ -23,8 +23,6 @@ import (
 	"hash"
 	"io"
 	"sync"
-	// "github.com/ethereum/go-ethereum/logger"
-	// "github.com/ethereum/go-ethereum/logger/glog"
 )
 
 /*
@@ -124,12 +122,13 @@ func (self *TreeChunker) Split(data io.Reader, size int64, chunkC chan *Chunk, s
 	jobC := make(chan *hashJob, 2*processors)
 	wg := &sync.WaitGroup{}
 	errC := make(chan error)
+	quitC := make(chan bool)
 
 	// wwg = workers waitgroup keeps track of hashworkers spawned by this split call
 	if wwg != nil {
 		wwg.Add(1)
 	}
-	go self.hashWorker(jobC, chunkC, errC, swg, wwg)
+	go self.hashWorker(jobC, chunkC, errC, quitC, swg, wwg)
 
 	depth := 0
 	treeSize := self.chunkSize
@@ -141,11 +140,10 @@ func (self *TreeChunker) Split(data io.Reader, size int64, chunkC chan *Chunk, s
 	}
 
 	key := make([]byte, self.hashFunc().Size())
-	// glog.V(logger.Detail).Infof("split request received for data (%v bytes, depth: %v)", size, depth)
 	// this waitgroup member is released after the root hash is calculated
 	wg.Add(1)
 	//launch actual recursive function passing the waitgroups
-	go self.split(depth, treeSize/self.branches, key, data, size, jobC, chunkC, errC, wg, swg, wwg)
+	go self.split(depth, treeSize/self.branches, key, data, size, jobC, chunkC, errC, quitC, wg, swg, wwg)
 
 	// closes internal error channel if all subprocesses in the workgroup finished
 	go func() {
@@ -153,7 +151,6 @@ func (self *TreeChunker) Split(data io.Reader, size int64, chunkC chan *Chunk, s
 		wg.Wait()
 		// if storage waitgroup is non-nil, we wait for storage to finish too
 		if swg != nil {
-			// glog.V(logger.Detail).Infof("Waiting for storage to finish")
 			swg.Wait()
 		}
 		close(errC)
@@ -162,14 +159,15 @@ func (self *TreeChunker) Split(data io.Reader, size int64, chunkC chan *Chunk, s
 	select {
 	case err := <-errC:
 		if err != nil {
+			close(quitC)
 			return nil, err
 		}
-		//
+		//TODO: add a timeout
 	}
 	return key, nil
 }
 
-func (self *TreeChunker) split(depth int, treeSize int64, key Key, data io.Reader, size int64, jobC chan *hashJob, chunkC chan *Chunk, errC chan error, parentWg, swg, wwg *sync.WaitGroup) {
+func (self *TreeChunker) split(depth int, treeSize int64, key Key, data io.Reader, size int64, jobC chan *hashJob, chunkC chan *Chunk, errC chan error, quitC chan bool, parentWg, swg, wwg *sync.WaitGroup) {
 
 	for depth > 0 && size < treeSize {
 		treeSize /= self.branches
@@ -180,17 +178,24 @@ func (self *TreeChunker) split(depth int, treeSize int64, key Key, data io.Reade
 		// leaf nodes -> content chunks
 		chunkData := make([]byte, size+8)
 		binary.LittleEndian.PutUint64(chunkData[0:8], uint64(size))
-		data.Read(chunkData[8:])
+		var readBytes int64
+		for readBytes < size {
+			n, err := data.Read(chunkData[8+readBytes:])
+			readBytes += int64(n)
+			if err != nil && !(err == io.EOF && readBytes == size) {
+				errC <- err
+				return
+			}
+		}
 		select {
 		case jobC <- &hashJob{key, chunkData, size, parentWg}:
-		case <-errC:
+		case <-quitC:
 		}
-		// glog.V(logger.Detail).Infof("read %v", size)
 		return
 	}
+	// dept > 0
 	// intermediate chunk containing child nodes hashes
 	branchCnt := int64((size + treeSize - 1) / treeSize)
-	// glog.V(logger.Detail).Infof("intermediate node: setting branches: %v, depth: %v, max subtree size: %v, data size: %v", branches, depth, treeSize, size)
 
 	var chunk []byte = make([]byte, branchCnt*self.hashSize+8)
 	var pos, i int64
@@ -210,7 +215,7 @@ func (self *TreeChunker) split(depth int, treeSize int64, key Key, data io.Reade
 		subTreeKey := chunk[8+i*self.hashSize : 8+(i+1)*self.hashSize]
 
 		childrenWg.Add(1)
-		self.split(depth-1, treeSize/self.branches, subTreeKey, data, secSize, jobC, chunkC, errC, childrenWg, swg, wwg)
+		self.split(depth-1, treeSize/self.branches, subTreeKey, data, secSize, jobC, chunkC, errC, quitC, childrenWg, swg, wwg)
 
 		i++
 		pos += treeSize
@@ -224,15 +229,15 @@ func (self *TreeChunker) split(depth int, treeSize int64, key Key, data io.Reade
 			wwg.Add(1)
 		}
 		self.workerCount++
-		go self.hashWorker(jobC, chunkC, errC, swg, wwg)
+		go self.hashWorker(jobC, chunkC, errC, quitC, swg, wwg)
 	}
 	select {
 	case jobC <- &hashJob{key, chunk, size, parentWg}:
-	case <-errC:
+	case <-quitC:
 	}
 }
 
-func (self *TreeChunker) hashWorker(jobC chan *hashJob, chunkC chan *Chunk, errC chan error, swg, wwg *sync.WaitGroup) {
+func (self *TreeChunker) hashWorker(jobC chan *hashJob, chunkC chan *Chunk, errC chan error, quitC chan bool, swg, wwg *sync.WaitGroup) {
 	hasher := self.hashFunc()
 	if wwg != nil {
 		defer wwg.Done()
@@ -247,8 +252,7 @@ func (self *TreeChunker) hashWorker(jobC chan *hashJob, chunkC chan *Chunk, errC
 			// now we got the hashes in the chunk, then hash the chunks
 			hasher.Reset()
 			self.hashChunk(hasher, job, chunkC, swg)
-			// glog.V(logger.Detail).Infof("hash chunk (%v)", job.size)
-		case <-errC:
+		case <-quitC:
 			return
 		}
 	}
@@ -276,6 +280,7 @@ func (self *TreeChunker) hashChunk(hasher hash.Hash, job *hashJob, chunkC chan *
 		}
 	}
 	job.parentWg.Done()
+
 	if chunkC != nil {
 		chunkC <- newChunk
 	}
@@ -328,7 +333,6 @@ func (self *LazyChunkReader) Size(quitC chan bool) (n int64, err error) {
 func (self *LazyChunkReader) ReadAt(b []byte, off int64) (read int, err error) {
 	// this is correct, a swarm doc cannot be zero length, so no EOF is expected
 	if len(b) == 0 {
-		// glog.V(logger.Detail).Infof("Size query for %v", chunk.Key.Log())
 		return 0, nil
 	}
 	quitC := make(chan bool)
@@ -336,13 +340,10 @@ func (self *LazyChunkReader) ReadAt(b []byte, off int64) (read int, err error) {
 	if err != nil {
 		return 0, err
 	}
-	// glog.V(logger.Detail).Infof("readAt: len(b): %v, off: %v, size: %v ", len(b), off, size)
 
 	errC := make(chan error)
-	// glog.V(logger.Detail).Infof("readAt: reading %v into %d bytes at offset %d.", self.chunk.Key.Log(), len(b), off)
 
 	// }
-	// glog.V(logger.Detail).Infof("-> want: %v, off: %v size: %v ", want, off, self.size)
 	var treeSize int64
 	var depth int
 	// calculate depth and max treeSize
@@ -364,22 +365,15 @@ func (self *LazyChunkReader) ReadAt(b []byte, off int64) (read int, err error) {
 
 		return 0, err
 	}
-	// glog.V(logger.Detail).Infof("ReadAt received %v", err)
-	// glog.V(logger.Detail).Infof("end: len(b): %v, off: %v, size: %v ", len(b), off, size)
 	if off+int64(len(b)) >= size {
-		// glog.V(logger.Detail).Infof(" len(b): %v EOF", len(b))
 		return len(b), io.EOF
 	}
-	// glog.V(logger.Detail).Infof("ReadAt returning at %d: %v", read, err)
 	return len(b), nil
 }
 
 func (self *LazyChunkReader) join(b []byte, off int64, eoff int64, depth int, treeSize int64, chunk *Chunk, parentWg *sync.WaitGroup, errC chan error, quitC chan bool) {
 	defer parentWg.Done()
 	// return NewDPA(&LocalStore{})
-	// glog.V(logger.Detail).Infof("inh len(b): %v, off: %v eoff: %v ", len(b), off, eoff)
-
-	// glog.V(logger.Detail).Infof("depth: %v, loff: %v, eoff: %v, chunk.Size: %v, treeSize: %v", depth, off, eoff, chunk.Size, treeSize)
 
 	// chunk.Size = int64(binary.LittleEndian.Uint64(chunk.SData[0:8]))
 
@@ -391,7 +385,6 @@ func (self *LazyChunkReader) join(b []byte, off int64, eoff int64, depth int, tr
 
 	// leaf chunk found
 	if depth == 0 {
-		// glog.V(logger.Detail).Infof("depth: %v, len(b): %v, off: %v, eoff: %v, chunk.Size: %v %v, treeSize: %v", depth, len(b), off, eoff, chunk.Size, len(chunk.SData), treeSize)
 		extra := 8 + eoff - int64(len(chunk.SData))
 		if extra > 0 {
 			eoff -= extra
@@ -406,7 +399,6 @@ func (self *LazyChunkReader) join(b []byte, off int64, eoff int64, depth int, tr
 
 	wg := &sync.WaitGroup{}
 	defer wg.Wait()
-	// glog.V(logger.Detail).Infof("start %v,end %v", start, end)
 
 	for i := start; i < end; i++ {
 		soff := i * treeSize
@@ -425,7 +417,6 @@ func (self *LazyChunkReader) join(b []byte, off int64, eoff int64, depth int, tr
 		wg.Add(1)
 		go func(j int64) {
 			childKey := chunk.SData[8+j*self.hashSize : 8+(j+1)*self.hashSize]
-			// glog.V(logger.Detail).Infof("subtree ind.ex: %v -> %v", j, childKey.Log())
 			chunk := retrieve(childKey, self.chunkC, quitC)
 			if chunk == nil {
 				select {
@@ -450,7 +441,6 @@ func retrieve(key Key, chunkC chan *Chunk, quitC chan bool) *Chunk {
 		Key: key,
 		C:   make(chan bool), // close channel to signal data delivery
 	}
-	// glog.V(logger.Detail).Infof("chunk data sent for %v (key interval in chunk %v-%v)", ch.Key.Log(), j*self.chunker.hashSize, (j+1)*self.chunker.hashSize)
 	// submit chunk for retrieval
 	select {
 	case chunkC <- chunk: // submit retrieval request, someone should be listening on the other side (or we will time out globally)
@@ -464,7 +454,6 @@ func retrieve(key Key, chunkC chan *Chunk, quitC chan bool) *Chunk {
 		// this is how we control process leakage (quitC is closed once join is finished (after timeout))
 		return nil
 	case <-chunk.C: // bells are ringing, data have been delivered
-		// glog.V(logger.Detail).Infof("chunk data received")
 	}
 	if len(chunk.SData) == 0 {
 		return nil // chunk.Size = int64(binary.LittleEndian.Uint64(chunk.SData[0:8]))
@@ -476,7 +465,6 @@ func retrieve(key Key, chunkC chan *Chunk, quitC chan bool) *Chunk {
 // Read keeps a cursor so cannot be called simulateously, see ReadAt
 func (self *LazyChunkReader) Read(b []byte) (read int, err error) {
 	read, err = self.ReadAt(b, self.off)
-	// glog.V(logger.Detail).Infof("read: %v, off: %v, error: %v", read, self.off, err)
 
 	self.off += int64(read)
 	return
diff --git a/vendor/github.com/ethereum/go-ethereum/swarm/storage/pyramid.go b/vendor/github.com/ethereum/go-ethereum/swarm/storage/pyramid.go
index 3c1ef17a0..79e1927b9 100644
--- a/vendor/github.com/ethereum/go-ethereum/swarm/storage/pyramid.go
+++ b/vendor/github.com/ethereum/go-ethereum/swarm/storage/pyramid.go
@@ -81,7 +81,6 @@ func (self *PyramidChunker) Split(data io.Reader, size int64, chunkC chan *Chunk
 
 	chunks := (size + self.chunkSize - 1) / self.chunkSize
 	depth := int(math.Ceil(math.Log(float64(chunks))/math.Log(float64(self.branches)))) + 1
-	// glog.V(logger.Detail).Infof("chunks: %v, depth: %v", chunks, depth)
 
 	results := Tree{
 		Chunks: chunks,
@@ -99,26 +98,24 @@ func (self *PyramidChunker) Split(data io.Reader, size int64, chunkC chan *Chunk
 		go self.processor(pend, swg, tasks, chunkC, &results)
 	}
 	// Feed the chunks into the task pool
+	read := 0
 	for index := 0; ; index++ {
 		buffer := make([]byte, self.chunkSize+8)
 		n, err := data.Read(buffer[8:])
-		last := err == io.ErrUnexpectedEOF || err == io.EOF
-		// glog.V(logger.Detail).Infof("n: %v, index: %v, depth: %v", n, index, depth)
+		read += n
+		last := int64(read) == size || err == io.ErrUnexpectedEOF || err == io.EOF
 		if err != nil && !last {
-			// glog.V(logger.Info).Infof("error: %v", err)
 			close(abortC)
 			break
 		}
 		binary.LittleEndian.PutUint64(buffer[:8], uint64(n))
 		pend.Add(1)
-		// glog.V(logger.Info).Infof("-> task %v (%v)", index, n)
 		select {
 		case tasks <- &Task{Index: int64(index), Size: uint64(n), Data: buffer[:n+8], Last: last}:
 		case <-abortC:
 			return nil, err
 		}
 		if last {
-			// glog.V(logger.Info).Infof("last task %v (%v)", index, n)
 			break
 		}
 	}
@@ -126,7 +123,6 @@ func (self *PyramidChunker) Split(data io.Reader, size int64, chunkC chan *Chunk
 	close(tasks)
 	pend.Wait()
 
-	// glog.V(logger.Info).Infof("len: %v", results.Levels[0][0])
 	key := results.Levels[0][0].Children[0][:]
 	return key, nil
 }
@@ -134,12 +130,10 @@ func (self *PyramidChunker) Split(data io.Reader, size int64, chunkC chan *Chunk
 func (self *PyramidChunker) processor(pend, swg *sync.WaitGroup, tasks chan *Task, chunkC chan *Chunk, results *Tree) {
 	defer pend.Done()
 
-	// glog.V(logger.Info).Infof("processor started")
 	// Start processing leaf chunks ad infinitum
 	hasher := self.hashFunc()
 	for task := range tasks {
 		depth, pow := len(results.Levels)-1, self.branches
-		// glog.V(logger.Info).Infof("task: %v, last: %v", task.Index, task.Last)
 		size := task.Size
 		data := task.Data
 		var node *Node
@@ -171,10 +165,8 @@ func (self *PyramidChunker) processor(pend, swg *sync.WaitGroup, tasks chan *Tas
 				}
 				node = &Node{pending, 0, make([]common.Hash, pending), last}
 				results.Levels[depth][task.Index/pow] = node
-				// glog.V(logger.Info).Infof("create node %v, %v (%v children, all pending)", depth, task.Index/pow, pending)
 			}
 			node.Pending--
-			// glog.V(logger.Info).Infof("pending now: %v", node.Pending)
 			i := task.Index / (pow / self.branches) % self.branches
 			if last {
 				node.Last = true
@@ -182,7 +174,6 @@ func (self *PyramidChunker) processor(pend, swg *sync.WaitGroup, tasks chan *Tas
 			copy(node.Children[i][:], hash)
 			node.Size += size
 			left := node.Pending
-			// glog.V(logger.Info).Infof("left pending now: %v, node size: %v", left, node.Size)
 			if chunkC != nil {
 				if swg != nil {
 					swg.Add(1)
@@ -198,7 +189,6 @@ func (self *PyramidChunker) processor(pend, swg *sync.WaitGroup, tasks chan *Tas
 
 			results.Lock.Unlock()
 			// If there's more work to be done, leave for others
-			// glog.V(logger.Info).Infof("left %v", left)
 			if left > 0 {
 				break
 			}
diff --git a/vendor/github.com/ethereum/go-ethereum/trie/hasher.go b/vendor/github.com/ethereum/go-ethereum/trie/hasher.go
index 87e02fb85..e395e00d7 100644
--- a/vendor/github.com/ethereum/go-ethereum/trie/hasher.go
+++ b/vendor/github.com/ethereum/go-ethereum/trie/hasher.go
@@ -27,8 +27,9 @@ import (
 )
 
 type hasher struct {
-	tmp *bytes.Buffer
-	sha hash.Hash
+	tmp                  *bytes.Buffer
+	sha                  hash.Hash
+	cachegen, cachelimit uint16
 }
 
 // hashers live in a global pool.
@@ -38,8 +39,10 @@ var hasherPool = sync.Pool{
 	},
 }
 
-func newHasher() *hasher {
-	return hasherPool.Get().(*hasher)
+func newHasher(cachegen, cachelimit uint16) *hasher {
+	h := hasherPool.Get().(*hasher)
+	h.cachegen, h.cachelimit = cachegen, cachelimit
+	return h
 }
 
 func returnHasherToPool(h *hasher) {
@@ -50,8 +53,18 @@ func returnHasherToPool(h *hasher) {
 // original node initialzied with the computed hash to replace the original one.
 func (h *hasher) hash(n node, db DatabaseWriter, force bool) (node, node, error) {
 	// If we're not storing the node, just hashing, use avaialble cached data
-	if hash, dirty := n.cache(); hash != nil && (db == nil || !dirty) {
-		return hash, n, nil
+	if hash, dirty := n.cache(); hash != nil {
+		if db == nil {
+			return hash, n, nil
+		}
+		if n.canUnload(h.cachegen, h.cachelimit) {
+			// Evict the node from cache. All of its subnodes will have a lower or equal
+			// cache generation number.
+			return hash, hash, nil
+		}
+		if !dirty {
+			return hash, n, nil
+		}
 	}
 	// Trie not processed yet or needs storage, walk the children
 	collapsed, cached, err := h.hashChildren(n, db)
@@ -62,19 +75,21 @@ func (h *hasher) hash(n node, db DatabaseWriter, force bool) (node, node, error)
 	if err != nil {
 		return hashNode{}, n, err
 	}
-	// Cache the hash and RLP blob of the ndoe for later reuse
+	// Cache the hash of the ndoe for later reuse.
 	if hash, ok := hashed.(hashNode); ok && !force {
 		switch cached := cached.(type) {
-		case shortNode:
-			cached.hash = hash
+		case *shortNode:
+			cached = cached.copy()
+			cached.flags.hash = hash
 			if db != nil {
-				cached.dirty = false
+				cached.flags.dirty = false
 			}
 			return hashed, cached, nil
-		case fullNode:
-			cached.hash = hash
+		case *fullNode:
+			cached = cached.copy()
+			cached.flags.hash = hash
 			if db != nil {
-				cached.dirty = false
+				cached.flags.dirty = false
 			}
 			return hashed, cached, nil
 		}
@@ -89,40 +104,42 @@ func (h *hasher) hashChildren(original node, db DatabaseWriter) (node, node, err
 	var err error
 
 	switch n := original.(type) {
-	case shortNode:
+	case *shortNode:
 		// Hash the short node's child, caching the newly hashed subtree
-		cached := n
-		cached.Key = common.CopyBytes(cached.Key)
+		collapsed, cached := n.copy(), n.copy()
+		collapsed.Key = compactEncode(n.Key)
+		cached.Key = common.CopyBytes(n.Key)
 
-		n.Key = compactEncode(n.Key)
 		if _, ok := n.Val.(valueNode); !ok {
-			if n.Val, cached.Val, err = h.hash(n.Val, db, false); err != nil {
-				return n, original, err
+			collapsed.Val, cached.Val, err = h.hash(n.Val, db, false)
+			if err != nil {
+				return original, original, err
 			}
 		}
-		if n.Val == nil {
-			n.Val = valueNode(nil) // Ensure that nil children are encoded as empty strings.
+		if collapsed.Val == nil {
+			collapsed.Val = valueNode(nil) // Ensure that nil children are encoded as empty strings.
 		}
-		return n, cached, nil
+		return collapsed, cached, nil
 
-	case fullNode:
+	case *fullNode:
 		// Hash the full node's children, caching the newly hashed subtrees
-		cached := fullNode{dirty: n.dirty}
+		collapsed, cached := n.copy(), n.copy()
 
 		for i := 0; i < 16; i++ {
 			if n.Children[i] != nil {
-				if n.Children[i], cached.Children[i], err = h.hash(n.Children[i], db, false); err != nil {
-					return n, original, err
+				collapsed.Children[i], cached.Children[i], err = h.hash(n.Children[i], db, false)
+				if err != nil {
+					return original, original, err
 				}
 			} else {
-				n.Children[i] = valueNode(nil) // Ensure that nil children are encoded as empty strings.
+				collapsed.Children[i] = valueNode(nil) // Ensure that nil children are encoded as empty strings.
 			}
 		}
 		cached.Children[16] = n.Children[16]
-		if n.Children[16] == nil {
-			n.Children[16] = valueNode(nil)
+		if collapsed.Children[16] == nil {
+			collapsed.Children[16] = valueNode(nil)
 		}
-		return n, cached, nil
+		return collapsed, cached, nil
 
 	default:
 		// Value and hash nodes don't have children so they're left as were
@@ -140,6 +157,7 @@ func (h *hasher) store(n node, db DatabaseWriter, force bool) (node, error) {
 	if err := rlp.Encode(h.tmp, n); err != nil {
 		panic("encode error: " + err.Error())
 	}
+
 	if h.tmp.Len() < 32 && !force {
 		return n, nil // Nodes smaller than 32 bytes are stored inside their parent
 	}
diff --git a/vendor/github.com/ethereum/go-ethereum/trie/iterator.go b/vendor/github.com/ethereum/go-ethereum/trie/iterator.go
index 8cad51aff..afde6e19e 100644
--- a/vendor/github.com/ethereum/go-ethereum/trie/iterator.go
+++ b/vendor/github.com/ethereum/go-ethereum/trie/iterator.go
@@ -56,11 +56,11 @@ func (it *Iterator) makeKey() []byte {
 	key := it.keyBuf[:0]
 	for _, se := range it.nodeIt.stack {
 		switch node := se.node.(type) {
-		case fullNode:
+		case *fullNode:
 			if se.child <= 16 {
 				key = append(key, byte(se.child))
 			}
-		case shortNode:
+		case *shortNode:
 			if hasTerm(node.Key) {
 				key = append(key, node.Key[:len(node.Key)-1]...)
 			} else {
@@ -148,7 +148,7 @@ func (it *NodeIterator) step() error {
 		if (ancestor == common.Hash{}) {
 			ancestor = parent.parent
 		}
-		if node, ok := parent.node.(fullNode); ok {
+		if node, ok := parent.node.(*fullNode); ok {
 			// Full node, traverse all children, then the node itself
 			if parent.child >= len(node.Children) {
 				break
@@ -156,7 +156,7 @@ func (it *NodeIterator) step() error {
 			for parent.child++; parent.child < len(node.Children); parent.child++ {
 				if current := node.Children[parent.child]; current != nil {
 					it.stack = append(it.stack, &nodeIteratorState{
-						hash:   common.BytesToHash(node.hash),
+						hash:   common.BytesToHash(node.flags.hash),
 						node:   current,
 						parent: ancestor,
 						child:  -1,
@@ -164,14 +164,14 @@ func (it *NodeIterator) step() error {
 					break
 				}
 			}
-		} else if node, ok := parent.node.(shortNode); ok {
+		} else if node, ok := parent.node.(*shortNode); ok {
 			// Short node, traverse the pointer singleton child, then the node itself
 			if parent.child >= 0 {
 				break
 			}
 			parent.child++
 			it.stack = append(it.stack, &nodeIteratorState{
-				hash:   common.BytesToHash(node.hash),
+				hash:   common.BytesToHash(node.flags.hash),
 				node:   node.Val,
 				parent: ancestor,
 				child:  -1,
diff --git a/vendor/github.com/ethereum/go-ethereum/trie/node.go b/vendor/github.com/ethereum/go-ethereum/trie/node.go
index b97d370be..de9752c93 100644
--- a/vendor/github.com/ethereum/go-ethereum/trie/node.go
+++ b/vendor/github.com/ethereum/go-ethereum/trie/node.go
@@ -30,42 +30,60 @@ var indices = []string{"0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b
 type node interface {
 	fstring(string) string
 	cache() (hashNode, bool)
+	canUnload(cachegen, cachelimit uint16) bool
 }
 
 type (
 	fullNode struct {
 		Children [17]node // Actual trie node data to encode/decode (needs custom encoder)
-		hash     hashNode // Cached hash of the node to prevent rehashing (may be nil)
-		dirty    bool     // Cached flag whether the node's new or already stored
+		flags    nodeFlag
 	}
 	shortNode struct {
 		Key   []byte
 		Val   node
-		hash  hashNode // Cached hash of the node to prevent rehashing (may be nil)
-		dirty bool     // Cached flag whether the node's new or already stored
+		flags nodeFlag
 	}
 	hashNode  []byte
 	valueNode []byte
 )
 
 // EncodeRLP encodes a full node into the consensus RLP format.
-func (n fullNode) EncodeRLP(w io.Writer) error {
+func (n *fullNode) EncodeRLP(w io.Writer) error {
 	return rlp.Encode(w, n.Children)
 }
 
-// Cache accessors to retrieve precalculated values (avoid lengthy type switches).
-func (n fullNode) cache() (hashNode, bool)  { return n.hash, n.dirty }
-func (n shortNode) cache() (hashNode, bool) { return n.hash, n.dirty }
-func (n hashNode) cache() (hashNode, bool)  { return nil, true }
-func (n valueNode) cache() (hashNode, bool) { return nil, true }
+func (n *fullNode) copy() *fullNode   { copy := *n; return &copy }
+func (n *shortNode) copy() *shortNode { copy := *n; return &copy }
+
+// nodeFlag contains caching-related metadata about a node.
+type nodeFlag struct {
+	hash  hashNode // cached hash of the node (may be nil)
+	gen   uint16   // cache generation counter
+	dirty bool     // whether the node has changes that must be written to the database
+}
+
+// canUnload tells whether a node can be unloaded.
+func (n *nodeFlag) canUnload(cachegen, cachelimit uint16) bool {
+	return !n.dirty && cachegen-n.gen >= cachelimit
+}
+
+func (n *fullNode) canUnload(gen, limit uint16) bool  { return n.flags.canUnload(gen, limit) }
+func (n *shortNode) canUnload(gen, limit uint16) bool { return n.flags.canUnload(gen, limit) }
+func (n hashNode) canUnload(uint16, uint16) bool      { return false }
+func (n valueNode) canUnload(uint16, uint16) bool     { return false }
+
+func (n *fullNode) cache() (hashNode, bool)  { return n.flags.hash, n.flags.dirty }
+func (n *shortNode) cache() (hashNode, bool) { return n.flags.hash, n.flags.dirty }
+func (n hashNode) cache() (hashNode, bool)   { return nil, true }
+func (n valueNode) cache() (hashNode, bool)  { return nil, true }
 
 // Pretty printing.
-func (n fullNode) String() string  { return n.fstring("") }
-func (n shortNode) String() string { return n.fstring("") }
-func (n hashNode) String() string  { return n.fstring("") }
-func (n valueNode) String() string { return n.fstring("") }
+func (n *fullNode) String() string  { return n.fstring("") }
+func (n *shortNode) String() string { return n.fstring("") }
+func (n hashNode) String() string   { return n.fstring("") }
+func (n valueNode) String() string  { return n.fstring("") }
 
-func (n fullNode) fstring(ind string) string {
+func (n *fullNode) fstring(ind string) string {
 	resp := fmt.Sprintf("[\n%s  ", ind)
 	for i, node := range n.Children {
 		if node == nil {
@@ -76,7 +94,7 @@ func (n fullNode) fstring(ind string) string {
 	}
 	return resp + fmt.Sprintf("\n%s] ", ind)
 }
-func (n shortNode) fstring(ind string) string {
+func (n *shortNode) fstring(ind string) string {
 	return fmt.Sprintf("{%x: %v} ", n.Key, n.Val.fstring(ind+"  "))
 }
 func (n hashNode) fstring(ind string) string {
@@ -120,6 +138,7 @@ func decodeShort(hash, buf, elems []byte) (node, error) {
 	if err != nil {
 		return nil, err
 	}
+	flag := nodeFlag{hash: hash}
 	key := compactDecode(kbuf)
 	if key[len(key)-1] == 16 {
 		// value node
@@ -127,17 +146,17 @@ func decodeShort(hash, buf, elems []byte) (node, error) {
 		if err != nil {
 			return nil, fmt.Errorf("invalid value node: %v", err)
 		}
-		return shortNode{key, valueNode(val), hash, false}, nil
+		return &shortNode{key, append(valueNode{}, val...), flag}, nil
 	}
 	r, _, err := decodeRef(rest)
 	if err != nil {
 		return nil, wrapError(err, "val")
 	}
-	return shortNode{key, r, hash, false}, nil
+	return &shortNode{key, r, flag}, nil
 }
 
-func decodeFull(hash, buf, elems []byte) (fullNode, error) {
-	n := fullNode{hash: hash}
+func decodeFull(hash, buf, elems []byte) (*fullNode, error) {
+	n := &fullNode{flags: nodeFlag{hash: hash}}
 	for i := 0; i < 16; i++ {
 		cld, rest, err := decodeRef(elems)
 		if err != nil {
@@ -150,7 +169,7 @@ func decodeFull(hash, buf, elems []byte) (fullNode, error) {
 		return n, err
 	}
 	if len(val) > 0 {
-		n.Children[16] = valueNode(val)
+		n.Children[16] = append(valueNode{}, val...)
 	}
 	return n, nil
 }
@@ -176,7 +195,7 @@ func decodeRef(buf []byte) (node, []byte, error) {
 		// empty node
 		return nil, rest, nil
 	case kind == rlp.String && len(val) == 32:
-		return hashNode(val), rest, nil
+		return append(hashNode{}, val...), rest, nil
 	default:
 		return nil, nil, fmt.Errorf("invalid RLP string size %d (want 0 or 32)", len(val))
 	}
diff --git a/vendor/github.com/ethereum/go-ethereum/trie/proof.go b/vendor/github.com/ethereum/go-ethereum/trie/proof.go
index 116c13a1b..f193b52df 100644
--- a/vendor/github.com/ethereum/go-ethereum/trie/proof.go
+++ b/vendor/github.com/ethereum/go-ethereum/trie/proof.go
@@ -44,7 +44,7 @@ func (t *Trie) Prove(key []byte) []rlp.RawValue {
 	tn := t.root
 	for len(key) > 0 && tn != nil {
 		switch n := tn.(type) {
-		case shortNode:
+		case *shortNode:
 			if len(key) < len(n.Key) || !bytes.Equal(n.Key, key[:len(n.Key)]) {
 				// The trie doesn't contain the key.
 				tn = nil
@@ -53,7 +53,7 @@ func (t *Trie) Prove(key []byte) []rlp.RawValue {
 				key = key[len(n.Key):]
 			}
 			nodes = append(nodes, n)
-		case fullNode:
+		case *fullNode:
 			tn = n.Children[key[0]]
 			key = key[1:]
 			nodes = append(nodes, n)
@@ -70,7 +70,7 @@ func (t *Trie) Prove(key []byte) []rlp.RawValue {
 			panic(fmt.Sprintf("%T: invalid node: %v", tn, tn))
 		}
 	}
-	hasher := newHasher()
+	hasher := newHasher(0, 0)
 	proof := make([]rlp.RawValue, 0, len(nodes))
 	for i, n := range nodes {
 		// Don't bother checking for errors here since hasher panics
@@ -130,13 +130,13 @@ func VerifyProof(rootHash common.Hash, key []byte, proof []rlp.RawValue) (value
 func get(tn node, key []byte) ([]byte, node) {
 	for len(key) > 0 {
 		switch n := tn.(type) {
-		case shortNode:
+		case *shortNode:
 			if len(key) < len(n.Key) || !bytes.Equal(n.Key, key[:len(n.Key)]) {
 				return nil, nil
 			}
 			tn = n.Val
 			key = key[len(n.Key):]
-		case fullNode:
+		case *fullNode:
 			tn = n.Children[key[0]]
 			key = key[1:]
 		case hashNode:
diff --git a/vendor/github.com/ethereum/go-ethereum/trie/secure_trie.go b/vendor/github.com/ethereum/go-ethereum/trie/secure_trie.go
index 2a8b57214..4d9ebe4d3 100644
--- a/vendor/github.com/ethereum/go-ethereum/trie/secure_trie.go
+++ b/vendor/github.com/ethereum/go-ethereum/trie/secure_trie.go
@@ -49,8 +49,12 @@ type SecureTrie struct {
 // If root is the zero hash or the sha3 hash of an empty string, the
 // trie is initially empty. Otherwise, New will panic if db is nil
 // and returns MissingNodeError if the root node cannot be found.
+//
 // Accessing the trie loads nodes from db on demand.
-func NewSecure(root common.Hash, db Database) (*SecureTrie, error) {
+// Loaded nodes are kept around until their 'cache generation' expires.
+// A new cache generation is created by each call to Commit.
+// cachelimit sets the number of past cache generations to keep.
+func NewSecure(root common.Hash, db Database, cachelimit uint16) (*SecureTrie, error) {
 	if db == nil {
 		panic("NewSecure called with nil database")
 	}
@@ -58,9 +62,8 @@ func NewSecure(root common.Hash, db Database) (*SecureTrie, error) {
 	if err != nil {
 		return nil, err
 	}
-	return &SecureTrie{
-		trie: *trie,
-	}, nil
+	trie.SetCacheLimit(cachelimit)
+	return &SecureTrie{trie: *trie}, nil
 }
 
 // Get returns the value for key stored in the trie.
@@ -191,7 +194,7 @@ func (t *SecureTrie) secKey(key []byte) []byte {
 // The caller must not hold onto the return value because it will become
 // invalid on the next call to hashKey or secKey.
 func (t *SecureTrie) hashKey(key []byte) []byte {
-	h := newHasher()
+	h := newHasher(0, 0)
 	h.sha.Reset()
 	h.sha.Write(key)
 	buf := h.sha.Sum(t.hashKeyBuf[:0])
diff --git a/vendor/github.com/ethereum/go-ethereum/trie/sync.go b/vendor/github.com/ethereum/go-ethereum/trie/sync.go
index 6e9e029b9..400dff903 100644
--- a/vendor/github.com/ethereum/go-ethereum/trie/sync.go
+++ b/vendor/github.com/ethereum/go-ethereum/trie/sync.go
@@ -212,12 +212,14 @@ func (s *TrieSync) children(req *request) ([]*request, error) {
 	children := []child{}
 
 	switch node := (*req.object).(type) {
-	case shortNode:
+	case *shortNode:
+		node = node.copy() // Prevents linking all downloaded nodes together.
 		children = []child{{
 			node:  &node.Val,
 			depth: req.depth + len(node.Key),
 		}}
-	case fullNode:
+	case *fullNode:
+		node = node.copy()
 		for i := 0; i < 17; i++ {
 			if node.Children[i] != nil {
 				children = append(children, child{
diff --git a/vendor/github.com/ethereum/go-ethereum/trie/trie.go b/vendor/github.com/ethereum/go-ethereum/trie/trie.go
index 55598af98..65005bae8 100644
--- a/vendor/github.com/ethereum/go-ethereum/trie/trie.go
+++ b/vendor/github.com/ethereum/go-ethereum/trie/trie.go
@@ -62,6 +62,23 @@ type Trie struct {
 	root         node
 	db           Database
 	originalRoot common.Hash
+
+	// Cache generation values.
+	// cachegen increase by one with each commit operation.
+	// new nodes are tagged with the current generation and unloaded
+	// when their generation is older than than cachegen-cachelimit.
+	cachegen, cachelimit uint16
+}
+
+// SetCacheLimit sets the number of 'cache generations' to keep.
+// A cache generations is created by a call to Commit.
+func (t *Trie) SetCacheLimit(l uint16) {
+	t.cachelimit = l
+}
+
+// newFlag returns the cache flag value for a newly created node.
+func (t *Trie) newFlag() nodeFlag {
+	return nodeFlag{dirty: true, gen: t.cachegen}
 }
 
 // New creates a trie with an existing root node from db.
@@ -120,27 +137,25 @@ func (t *Trie) tryGet(origNode node, key []byte, pos int) (value []byte, newnode
 		return nil, nil, false, nil
 	case valueNode:
 		return n, n, false, nil
-	case shortNode:
+	case *shortNode:
 		if len(key)-pos < len(n.Key) || !bytes.Equal(n.Key, key[pos:pos+len(n.Key)]) {
 			// key not found in trie
 			return nil, n, false, nil
 		}
 		value, newnode, didResolve, err = t.tryGet(n.Val, key, pos+len(n.Key))
 		if err == nil && didResolve {
+			n = n.copy()
 			n.Val = newnode
-			return value, n, didResolve, err
-		} else {
-			return value, origNode, didResolve, err
 		}
-	case fullNode:
-		child := n.Children[key[pos]]
-		value, newnode, didResolve, err = t.tryGet(child, key, pos+1)
+		return value, n, didResolve, err
+	case *fullNode:
+		value, newnode, didResolve, err = t.tryGet(n.Children[key[pos]], key, pos+1)
 		if err == nil && didResolve {
+			n = n.copy()
 			n.Children[key[pos]] = newnode
-			return value, n, didResolve, err
-		} else {
-			return value, origNode, didResolve, err
+
 		}
+		return value, n, didResolve, err
 	case hashNode:
 		child, err := t.resolveHash(n, key[:pos], key[pos:])
 		if err != nil {
@@ -199,22 +214,19 @@ func (t *Trie) insert(n node, prefix, key []byte, value node) (bool, node, error
 		return true, value, nil
 	}
 	switch n := n.(type) {
-	case shortNode:
+	case *shortNode:
 		matchlen := prefixLen(key, n.Key)
 		// If the whole key matches, keep this short node as is
 		// and only update the value.
 		if matchlen == len(n.Key) {
 			dirty, nn, err := t.insert(n.Val, append(prefix, key[:matchlen]...), key[matchlen:], value)
-			if err != nil {
-				return false, nil, err
+			if !dirty || err != nil {
+				return false, n, err
 			}
-			if !dirty {
-				return false, n, nil
-			}
-			return true, shortNode{n.Key, nn, nil, true}, nil
+			return true, &shortNode{n.Key, nn, t.newFlag()}, nil
 		}
 		// Otherwise branch out at the index where they differ.
-		branch := fullNode{dirty: true}
+		branch := &fullNode{flags: t.newFlag()}
 		var err error
 		_, branch.Children[n.Key[matchlen]], err = t.insert(nil, append(prefix, n.Key[:matchlen+1]...), n.Key[matchlen+1:], n.Val)
 		if err != nil {
@@ -229,21 +241,19 @@ func (t *Trie) insert(n node, prefix, key []byte, value node) (bool, node, error
 			return true, branch, nil
 		}
 		// Otherwise, replace it with a short node leading up to the branch.
-		return true, shortNode{key[:matchlen], branch, nil, true}, nil
+		return true, &shortNode{key[:matchlen], branch, t.newFlag()}, nil
 
-	case fullNode:
+	case *fullNode:
 		dirty, nn, err := t.insert(n.Children[key[0]], append(prefix, key[0]), key[1:], value)
-		if err != nil {
-			return false, nil, err
+		if !dirty || err != nil {
+			return false, n, err
 		}
-		if !dirty {
-			return false, n, nil
-		}
-		n.Children[key[0]], n.hash, n.dirty = nn, nil, true
+		n = n.copy()
+		n.Children[key[0]], n.flags.hash, n.flags.dirty = nn, nil, true
 		return true, n, nil
 
 	case nil:
-		return true, shortNode{key, value, nil, true}, nil
+		return true, &shortNode{key, value, t.newFlag()}, nil
 
 	case hashNode:
 		// We've hit a part of the trie that isn't loaded yet. Load
@@ -254,11 +264,8 @@ func (t *Trie) insert(n node, prefix, key []byte, value node) (bool, node, error
 			return false, nil, err
 		}
 		dirty, nn, err := t.insert(rn, prefix, key, value)
-		if err != nil {
-			return false, nil, err
-		}
-		if !dirty {
-			return false, rn, nil
+		if !dirty || err != nil {
+			return false, rn, err
 		}
 		return true, nn, nil
 
@@ -291,7 +298,7 @@ func (t *Trie) TryDelete(key []byte) error {
 // nodes on the way up after deleting recursively.
 func (t *Trie) delete(n node, prefix, key []byte) (bool, node, error) {
 	switch n := n.(type) {
-	case shortNode:
+	case *shortNode:
 		matchlen := prefixLen(key, n.Key)
 		if matchlen < len(n.Key) {
 			return false, n, nil // don't replace n on mismatch
@@ -304,34 +311,29 @@ func (t *Trie) delete(n node, prefix, key []byte) (bool, node, error) {
 		// subtrie must contain at least two other values with keys
 		// longer than n.Key.
 		dirty, child, err := t.delete(n.Val, append(prefix, key[:len(n.Key)]...), key[len(n.Key):])
-		if err != nil {
-			return false, nil, err
-		}
-		if !dirty {
-			return false, n, nil
+		if !dirty || err != nil {
+			return false, n, err
 		}
 		switch child := child.(type) {
-		case shortNode:
+		case *shortNode:
 			// Deleting from the subtrie reduced it to another
 			// short node. Merge the nodes to avoid creating a
 			// shortNode{..., shortNode{...}}. Use concat (which
 			// always creates a new slice) instead of append to
 			// avoid modifying n.Key since it might be shared with
 			// other nodes.
-			return true, shortNode{concat(n.Key, child.Key...), child.Val, nil, true}, nil
+			return true, &shortNode{concat(n.Key, child.Key...), child.Val, t.newFlag()}, nil
 		default:
-			return true, shortNode{n.Key, child, nil, true}, nil
+			return true, &shortNode{n.Key, child, t.newFlag()}, nil
 		}
 
-	case fullNode:
+	case *fullNode:
 		dirty, nn, err := t.delete(n.Children[key[0]], append(prefix, key[0]), key[1:])
-		if err != nil {
-			return false, nil, err
+		if !dirty || err != nil {
+			return false, n, err
 		}
-		if !dirty {
-			return false, n, nil
-		}
-		n.Children[key[0]], n.hash, n.dirty = nn, nil, true
+		n = n.copy()
+		n.Children[key[0]], n.flags.hash, n.flags.dirty = nn, nil, true
 
 		// Check how many non-nil entries are left after deleting and
 		// reduce the full node to a short node if only one entry is
@@ -365,14 +367,14 @@ func (t *Trie) delete(n node, prefix, key []byte) (bool, node, error) {
 				if err != nil {
 					return false, nil, err
 				}
-				if cnode, ok := cnode.(shortNode); ok {
+				if cnode, ok := cnode.(*shortNode); ok {
 					k := append([]byte{byte(pos)}, cnode.Key...)
-					return true, shortNode{k, cnode.Val, nil, true}, nil
+					return true, &shortNode{k, cnode.Val, t.newFlag()}, nil
 				}
 			}
 			// Otherwise, n is replaced by a one-nibble short node
 			// containing the child.
-			return true, shortNode{[]byte{byte(pos)}, n.Children[pos], nil, true}, nil
+			return true, &shortNode{[]byte{byte(pos)}, n.Children[pos], t.newFlag()}, nil
 		}
 		// n still contains at least two values and cannot be reduced.
 		return true, n, nil
@@ -392,11 +394,8 @@ func (t *Trie) delete(n node, prefix, key []byte) (bool, node, error) {
 			return false, nil, err
 		}
 		dirty, nn, err := t.delete(rn, prefix, key)
-		if err != nil {
-			return false, nil, err
-		}
-		if !dirty {
-			return false, rn, nil
+		if !dirty || err != nil {
+			return false, rn, err
 		}
 		return true, nn, nil
 
@@ -471,6 +470,7 @@ func (t *Trie) CommitTo(db DatabaseWriter) (root common.Hash, err error) {
 		return (common.Hash{}), err
 	}
 	t.root = cached
+	t.cachegen++
 	return common.BytesToHash(hash.(hashNode)), nil
 }
 
@@ -478,7 +478,7 @@ func (t *Trie) hashRoot(db DatabaseWriter) (node, node, error) {
 	if t.root == nil {
 		return hashNode(emptyRoot.Bytes()), nil, nil
 	}
-	h := newHasher()
+	h := newHasher(t.cachegen, t.cachelimit)
 	defer returnHasherToPool(h)
 	return h.hash(t.root, db, true)
 }
diff --git a/vendor/github.com/rcrowley/go-metrics/README.md b/vendor/github.com/rcrowley/go-metrics/README.md
index 66ba9cab5..2d1a6dcfa 100644
--- a/vendor/github.com/rcrowley/go-metrics/README.md
+++ b/vendor/github.com/rcrowley/go-metrics/README.md
@@ -21,6 +21,9 @@ g := metrics.NewGauge()
 metrics.Register("bar", g)
 g.Update(47)
 
+r := NewRegistry()
+g := metrics.NewRegisteredFunctionalGauge("cache-evictions", r, func() int64 { return cache.getEvictionsCount() })
+
 s := metrics.NewExpDecaySample(1028, 0.015) // or metrics.NewUniformSample(1028)
 h := metrics.NewHistogram(s)
 metrics.Register("baz", h)
@@ -36,6 +39,15 @@ t.Time(func() {})
 t.Update(47)
 ```
 
+Register() is not threadsafe. For threadsafe metric registration use
+GetOrRegister:
+
+```
+t := metrics.GetOrRegisterTimer("account.create.latency", nil)
+t.Time(func() {})
+t.Update(47)
+```
+
 Periodically log every metric in human-readable form to standard error:
 
 ```go
@@ -67,7 +79,7 @@ issues [#121](https://github.com/rcrowley/go-metrics/issues/121) and
 [#124](https://github.com/rcrowley/go-metrics/issues/124) for progress and details.
 
 ```go
-import "github.com/rcrowley/go-metrics/influxdb"
+import "github.com/vrischmann/go-metrics-influxdb"
 
 go influxdb.Influxdb(metrics.DefaultRegistry, 10e9, &influxdb.Config{
     Host:     "127.0.0.1:8086",
@@ -137,3 +149,5 @@ Clients are available for the following destinations:
 * Librato - [https://github.com/mihasya/go-metrics-librato](https://github.com/mihasya/go-metrics-librato)
 * Graphite - [https://github.com/cyberdelia/go-metrics-graphite](https://github.com/cyberdelia/go-metrics-graphite)
 * InfluxDB - [https://github.com/vrischmann/go-metrics-influxdb](https://github.com/vrischmann/go-metrics-influxdb)
+* Ganglia - [https://github.com/appscode/metlia](https://github.com/appscode/metlia)
+* Prometheus - [https://github.com/deathowl/go-metrics-prometheus](https://github.com/deathowl/go-metrics-prometheus)
diff --git a/vendor/github.com/rcrowley/go-metrics/cmd/metrics-bench/metrics-bench.go b/vendor/github.com/rcrowley/go-metrics/cmd/metrics-bench/metrics-bench.go
new file mode 100644
index 000000000..dddaf4b12
--- /dev/null
+++ b/vendor/github.com/rcrowley/go-metrics/cmd/metrics-bench/metrics-bench.go
@@ -0,0 +1,20 @@
+package main
+
+import (
+	"fmt"
+	"github.com/rcrowley/go-metrics"
+	"time"
+)
+
+func main() {
+	r := metrics.NewRegistry()
+	for i := 0; i < 10000; i++ {
+		r.Register(fmt.Sprintf("counter-%d", i), metrics.NewCounter())
+		r.Register(fmt.Sprintf("gauge-%d", i), metrics.NewGauge())
+		r.Register(fmt.Sprintf("gaugefloat64-%d", i), metrics.NewGaugeFloat64())
+		r.Register(fmt.Sprintf("histogram-uniform-%d", i), metrics.NewHistogram(metrics.NewUniformSample(1028)))
+		r.Register(fmt.Sprintf("histogram-exp-%d", i), metrics.NewHistogram(metrics.NewExpDecaySample(1028, 0.015)))
+		r.Register(fmt.Sprintf("meter-%d", i), metrics.NewMeter())
+	}
+	time.Sleep(600e9)
+}
diff --git a/vendor/github.com/rcrowley/go-metrics/cmd/metrics-example/metrics-example.go b/vendor/github.com/rcrowley/go-metrics/cmd/metrics-example/metrics-example.go
new file mode 100644
index 000000000..66f42c046
--- /dev/null
+++ b/vendor/github.com/rcrowley/go-metrics/cmd/metrics-example/metrics-example.go
@@ -0,0 +1,154 @@
+package main
+
+import (
+	"errors"
+	"github.com/rcrowley/go-metrics"
+	// "github.com/rcrowley/go-metrics/stathat"
+	"log"
+	"math/rand"
+	"os"
+	// "syslog"
+	"time"
+)
+
+const fanout = 10
+
+func main() {
+
+	r := metrics.NewRegistry()
+
+	c := metrics.NewCounter()
+	r.Register("foo", c)
+	for i := 0; i < fanout; i++ {
+		go func() {
+			for {
+				c.Dec(19)
+				time.Sleep(300e6)
+			}
+		}()
+		go func() {
+			for {
+				c.Inc(47)
+				time.Sleep(400e6)
+			}
+		}()
+	}
+
+	g := metrics.NewGauge()
+	r.Register("bar", g)
+	for i := 0; i < fanout; i++ {
+		go func() {
+			for {
+				g.Update(19)
+				time.Sleep(300e6)
+			}
+		}()
+		go func() {
+			for {
+				g.Update(47)
+				time.Sleep(400e6)
+			}
+		}()
+	}
+
+	gf := metrics.NewGaugeFloat64()
+	r.Register("barfloat64", gf)
+	for i := 0; i < fanout; i++ {
+		go func() {
+			for {
+				g.Update(19.0)
+				time.Sleep(300e6)
+			}
+		}()
+		go func() {
+			for {
+				g.Update(47.0)
+				time.Sleep(400e6)
+			}
+		}()
+	}
+
+	hc := metrics.NewHealthcheck(func(h metrics.Healthcheck) {
+		if 0 < rand.Intn(2) {
+			h.Healthy()
+		} else {
+			h.Unhealthy(errors.New("baz"))
+		}
+	})
+	r.Register("baz", hc)
+
+	s := metrics.NewExpDecaySample(1028, 0.015)
+	//s := metrics.NewUniformSample(1028)
+	h := metrics.NewHistogram(s)
+	r.Register("bang", h)
+	for i := 0; i < fanout; i++ {
+		go func() {
+			for {
+				h.Update(19)
+				time.Sleep(300e6)
+			}
+		}()
+		go func() {
+			for {
+				h.Update(47)
+				time.Sleep(400e6)
+			}
+		}()
+	}
+
+	m := metrics.NewMeter()
+	r.Register("quux", m)
+	for i := 0; i < fanout; i++ {
+		go func() {
+			for {
+				m.Mark(19)
+				time.Sleep(300e6)
+			}
+		}()
+		go func() {
+			for {
+				m.Mark(47)
+				time.Sleep(400e6)
+			}
+		}()
+	}
+
+	t := metrics.NewTimer()
+	r.Register("hooah", t)
+	for i := 0; i < fanout; i++ {
+		go func() {
+			for {
+				t.Time(func() { time.Sleep(300e6) })
+			}
+		}()
+		go func() {
+			for {
+				t.Time(func() { time.Sleep(400e6) })
+			}
+		}()
+	}
+
+	metrics.RegisterDebugGCStats(r)
+	go metrics.CaptureDebugGCStats(r, 5e9)
+
+	metrics.RegisterRuntimeMemStats(r)
+	go metrics.CaptureRuntimeMemStats(r, 5e9)
+
+	metrics.Log(r, 60e9, log.New(os.Stderr, "metrics: ", log.Lmicroseconds))
+
+	/*
+		w, err := syslog.Dial("unixgram", "/dev/log", syslog.LOG_INFO, "metrics")
+		if nil != err { log.Fatalln(err) }
+		metrics.Syslog(r, 60e9, w)
+	*/
+
+	/*
+		addr, _ := net.ResolveTCPAddr("tcp", "127.0.0.1:2003")
+		metrics.Graphite(r, 10e9, "metrics", addr)
+	*/
+
+	/*
+		stathat.Stathat(r, 10e9, "example@example.com")
+	*/
+
+}
diff --git a/vendor/github.com/rcrowley/go-metrics/cmd/never-read/never-read.go b/vendor/github.com/rcrowley/go-metrics/cmd/never-read/never-read.go
new file mode 100644
index 000000000..dc175b778
--- /dev/null
+++ b/vendor/github.com/rcrowley/go-metrics/cmd/never-read/never-read.go
@@ -0,0 +1,22 @@
+package main
+
+import (
+	"log"
+	"net"
+)
+
+func main() {
+	addr, _ := net.ResolveTCPAddr("tcp", "127.0.0.1:2003")
+	l, err := net.ListenTCP("tcp", addr)
+	if nil != err {
+		log.Fatalln(err)
+	}
+	log.Println("listening", l.Addr())
+	for {
+		c, err := l.AcceptTCP()
+		if nil != err {
+			log.Fatalln(err)
+		}
+		log.Println("accepted", c.RemoteAddr())
+	}
+}
diff --git a/vendor/github.com/rcrowley/go-metrics/exp/exp.go b/vendor/github.com/rcrowley/go-metrics/exp/exp.go
new file mode 100644
index 000000000..11dd3f898
--- /dev/null
+++ b/vendor/github.com/rcrowley/go-metrics/exp/exp.go
@@ -0,0 +1,156 @@
+// Hook go-metrics into expvar
+// on any /debug/metrics request, load all vars from the registry into expvar, and execute regular expvar handler
+package exp
+
+import (
+	"expvar"
+	"fmt"
+	"net/http"
+	"sync"
+
+	"github.com/rcrowley/go-metrics"
+)
+
+type exp struct {
+	expvarLock sync.Mutex // expvar panics if you try to register the same var twice, so we must probe it safely
+	registry   metrics.Registry
+}
+
+func (exp *exp) expHandler(w http.ResponseWriter, r *http.Request) {
+	// load our variables into expvar
+	exp.syncToExpvar()
+
+	// now just run the official expvar handler code (which is not publicly callable, so pasted inline)
+	w.Header().Set("Content-Type", "application/json; charset=utf-8")
+	fmt.Fprintf(w, "{\n")
+	first := true
+	expvar.Do(func(kv expvar.KeyValue) {
+		if !first {
+			fmt.Fprintf(w, ",\n")
+		}
+		first = false
+		fmt.Fprintf(w, "%q: %s", kv.Key, kv.Value)
+	})
+	fmt.Fprintf(w, "\n}\n")
+}
+
+// Exp will register an expvar powered metrics handler with http.DefaultServeMux on "/debug/vars"
+func Exp(r metrics.Registry) {
+	h := ExpHandler(r)
+	// this would cause a panic:
+	// panic: http: multiple registrations for /debug/vars
+	// http.HandleFunc("/debug/vars", e.expHandler)
+	// haven't found an elegant way, so just use a different endpoint
+	http.Handle("/debug/metrics", h)
+}
+
+// ExpHandler will return an expvar powered metrics handler.
+func ExpHandler(r metrics.Registry) http.Handler {
+	e := exp{sync.Mutex{}, r}
+	return http.HandlerFunc(e.expHandler)
+}
+
+func (exp *exp) getInt(name string) *expvar.Int {
+	var v *expvar.Int
+	exp.expvarLock.Lock()
+	p := expvar.Get(name)
+	if p != nil {
+		v = p.(*expvar.Int)
+	} else {
+		v = new(expvar.Int)
+		expvar.Publish(name, v)
+	}
+	exp.expvarLock.Unlock()
+	return v
+}
+
+func (exp *exp) getFloat(name string) *expvar.Float {
+	var v *expvar.Float
+	exp.expvarLock.Lock()
+	p := expvar.Get(name)
+	if p != nil {
+		v = p.(*expvar.Float)
+	} else {
+		v = new(expvar.Float)
+		expvar.Publish(name, v)
+	}
+	exp.expvarLock.Unlock()
+	return v
+}
+
+func (exp *exp) publishCounter(name string, metric metrics.Counter) {
+	v := exp.getInt(name)
+	v.Set(metric.Count())
+}
+
+func (exp *exp) publishGauge(name string, metric metrics.Gauge) {
+	v := exp.getInt(name)
+	v.Set(metric.Value())
+}
+func (exp *exp) publishGaugeFloat64(name string, metric metrics.GaugeFloat64) {
+	exp.getFloat(name).Set(metric.Value())
+}
+
+func (exp *exp) publishHistogram(name string, metric metrics.Histogram) {
+	h := metric.Snapshot()
+	ps := h.Percentiles([]float64{0.5, 0.75, 0.95, 0.99, 0.999})
+	exp.getInt(name + ".count").Set(h.Count())
+	exp.getFloat(name + ".min").Set(float64(h.Min()))
+	exp.getFloat(name + ".max").Set(float64(h.Max()))
+	exp.getFloat(name + ".mean").Set(float64(h.Mean()))
+	exp.getFloat(name + ".std-dev").Set(float64(h.StdDev()))
+	exp.getFloat(name + ".50-percentile").Set(float64(ps[0]))
+	exp.getFloat(name + ".75-percentile").Set(float64(ps[1]))
+	exp.getFloat(name + ".95-percentile").Set(float64(ps[2]))
+	exp.getFloat(name + ".99-percentile").Set(float64(ps[3]))
+	exp.getFloat(name + ".999-percentile").Set(float64(ps[4]))
+}
+
+func (exp *exp) publishMeter(name string, metric metrics.Meter) {
+	m := metric.Snapshot()
+	exp.getInt(name + ".count").Set(m.Count())
+	exp.getFloat(name + ".one-minute").Set(float64(m.Rate1()))
+	exp.getFloat(name + ".five-minute").Set(float64(m.Rate5()))
+	exp.getFloat(name + ".fifteen-minute").Set(float64((m.Rate15())))
+	exp.getFloat(name + ".mean").Set(float64(m.RateMean()))
+}
+
+func (exp *exp) publishTimer(name string, metric metrics.Timer) {
+	t := metric.Snapshot()
+	ps := t.Percentiles([]float64{0.5, 0.75, 0.95, 0.99, 0.999})
+	exp.getInt(name + ".count").Set(t.Count())
+	exp.getFloat(name + ".min").Set(float64(t.Min()))
+	exp.getFloat(name + ".max").Set(float64(t.Max()))
+	exp.getFloat(name + ".mean").Set(float64(t.Mean()))
+	exp.getFloat(name + ".std-dev").Set(float64(t.StdDev()))
+	exp.getFloat(name + ".50-percentile").Set(float64(ps[0]))
+	exp.getFloat(name + ".75-percentile").Set(float64(ps[1]))
+	exp.getFloat(name + ".95-percentile").Set(float64(ps[2]))
+	exp.getFloat(name + ".99-percentile").Set(float64(ps[3]))
+	exp.getFloat(name + ".999-percentile").Set(float64(ps[4]))
+	exp.getFloat(name + ".one-minute").Set(float64(t.Rate1()))
+	exp.getFloat(name + ".five-minute").Set(float64(t.Rate5()))
+	exp.getFloat(name + ".fifteen-minute").Set(float64((t.Rate15())))
+	exp.getFloat(name + ".mean-rate").Set(float64(t.RateMean()))
+}
+
+func (exp *exp) syncToExpvar() {
+	exp.registry.Each(func(name string, i interface{}) {
+		switch i.(type) {
+		case metrics.Counter:
+			exp.publishCounter(name, i.(metrics.Counter))
+		case metrics.Gauge:
+			exp.publishGauge(name, i.(metrics.Gauge))
+		case metrics.GaugeFloat64:
+			exp.publishGaugeFloat64(name, i.(metrics.GaugeFloat64))
+		case metrics.Histogram:
+			exp.publishHistogram(name, i.(metrics.Histogram))
+		case metrics.Meter:
+			exp.publishMeter(name, i.(metrics.Meter))
+		case metrics.Timer:
+			exp.publishTimer(name, i.(metrics.Timer))
+		default:
+			panic(fmt.Sprintf("unsupported type for '%s': %T", name, i))
+		}
+	})
+}
diff --git a/vendor/github.com/rcrowley/go-metrics/gauge.go b/vendor/github.com/rcrowley/go-metrics/gauge.go
index 807638a31..d618c4553 100644
--- a/vendor/github.com/rcrowley/go-metrics/gauge.go
+++ b/vendor/github.com/rcrowley/go-metrics/gauge.go
@@ -36,6 +36,25 @@ func NewRegisteredGauge(name string, r Registry) Gauge {
 	return c
 }
 
+// NewFunctionalGauge constructs a new FunctionalGauge.
+func NewFunctionalGauge(f func() int64) Gauge {
+	if UseNilMetrics {
+		return NilGauge{}
+	}
+	return &FunctionalGauge{value: f}
+}
+
+
+// NewRegisteredFunctionalGauge constructs and registers a new StandardGauge.
+func NewRegisteredFunctionalGauge(name string, r Registry, f func() int64) Gauge {
+	c := NewFunctionalGauge(f)
+	if nil == r {
+		r = DefaultRegistry
+	}
+	r.Register(name, c)
+	return c
+}
+
 // GaugeSnapshot is a read-only copy of another Gauge.
 type GaugeSnapshot int64
 
@@ -82,3 +101,20 @@ func (g *StandardGauge) Update(v int64) {
 func (g *StandardGauge) Value() int64 {
 	return atomic.LoadInt64(&g.value)
 }
+// FunctionalGauge returns value from given function
+type FunctionalGauge struct {
+	value func() int64
+}
+
+// Value returns the gauge's current value.
+func (g FunctionalGauge) Value() int64 {
+	return g.value()
+}
+
+// Snapshot returns the snapshot.
+func (g FunctionalGauge) Snapshot() Gauge { return GaugeSnapshot(g.Value()) }
+
+// Update panics.
+func (FunctionalGauge) Update(int64) {
+	panic("Update called on a FunctionalGauge")
+}
\ No newline at end of file
diff --git a/vendor/github.com/rcrowley/go-metrics/gauge_float64.go b/vendor/github.com/rcrowley/go-metrics/gauge_float64.go
index 47c3566c2..6f93920b2 100644
--- a/vendor/github.com/rcrowley/go-metrics/gauge_float64.go
+++ b/vendor/github.com/rcrowley/go-metrics/gauge_float64.go
@@ -38,6 +38,24 @@ func NewRegisteredGaugeFloat64(name string, r Registry) GaugeFloat64 {
 	return c
 }
 
+// NewFunctionalGauge constructs a new FunctionalGauge.
+func NewFunctionalGaugeFloat64(f func() float64) GaugeFloat64 {
+	if UseNilMetrics {
+		return NilGaugeFloat64{}
+	}
+	return &FunctionalGaugeFloat64{value: f}
+}
+
+// NewRegisteredFunctionalGauge constructs and registers a new StandardGauge.
+func NewRegisteredFunctionalGaugeFloat64(name string, r Registry, f func() float64) GaugeFloat64 {
+	c := NewFunctionalGaugeFloat64(f)
+	if nil == r {
+		r = DefaultRegistry
+	}
+	r.Register(name, c)
+	return c
+}
+
 // GaugeFloat64Snapshot is a read-only copy of another GaugeFloat64.
 type GaugeFloat64Snapshot float64
 
@@ -89,3 +107,21 @@ func (g *StandardGaugeFloat64) Value() float64 {
 	defer g.mutex.Unlock()
 	return g.value
 }
+
+// FunctionalGaugeFloat64 returns value from given function
+type FunctionalGaugeFloat64 struct {
+	value func() float64
+}
+
+// Value returns the gauge's current value.
+func (g FunctionalGaugeFloat64) Value() float64 {
+	return g.value()
+}
+
+// Snapshot returns the snapshot.
+func (g FunctionalGaugeFloat64) Snapshot() GaugeFloat64 { return GaugeFloat64Snapshot(g.Value()) }
+
+// Update panics.
+func (FunctionalGaugeFloat64) Update(float64) {
+	panic("Update called on a FunctionalGaugeFloat64")
+}
diff --git a/vendor/github.com/rcrowley/go-metrics/json.go b/vendor/github.com/rcrowley/go-metrics/json.go
index 2676aeea5..2fdcbcfbf 100644
--- a/vendor/github.com/rcrowley/go-metrics/json.go
+++ b/vendor/github.com/rcrowley/go-metrics/json.go
@@ -81,3 +81,7 @@ func WriteJSON(r Registry, d time.Duration, w io.Writer) {
 func WriteJSONOnce(r Registry, w io.Writer) {
 	json.NewEncoder(w).Encode(r)
 }
+
+func (p *PrefixedRegistry) MarshalJSON() ([]byte, error) {
+	return json.Marshal(p.underlying)
+}
diff --git a/vendor/github.com/rcrowley/go-metrics/librato/client.go b/vendor/github.com/rcrowley/go-metrics/librato/client.go
new file mode 100644
index 000000000..8c0c850e3
--- /dev/null
+++ b/vendor/github.com/rcrowley/go-metrics/librato/client.go
@@ -0,0 +1,102 @@
+package librato
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"io/ioutil"
+	"net/http"
+)
+
+const Operations = "operations"
+const OperationsShort = "ops"
+
+type LibratoClient struct {
+	Email, Token string
+}
+
+// property strings
+const (
+	// display attributes
+	Color             = "color"
+	DisplayMax        = "display_max"
+	DisplayMin        = "display_min"
+	DisplayUnitsLong  = "display_units_long"
+	DisplayUnitsShort = "display_units_short"
+	DisplayStacked    = "display_stacked"
+	DisplayTransform  = "display_transform"
+	// special gauge display attributes
+	SummarizeFunction = "summarize_function"
+	Aggregate         = "aggregate"
+
+	// metric keys
+	Name        = "name"
+	Period      = "period"
+	Description = "description"
+	DisplayName = "display_name"
+	Attributes  = "attributes"
+
+	// measurement keys
+	MeasureTime = "measure_time"
+	Source      = "source"
+	Value       = "value"
+
+	// special gauge keys
+	Count      = "count"
+	Sum        = "sum"
+	Max        = "max"
+	Min        = "min"
+	SumSquares = "sum_squares"
+
+	// batch keys
+	Counters = "counters"
+	Gauges   = "gauges"
+
+	MetricsPostUrl = "https://metrics-api.librato.com/v1/metrics"
+)
+
+type Measurement map[string]interface{}
+type Metric map[string]interface{}
+
+type Batch struct {
+	Gauges      []Measurement `json:"gauges,omitempty"`
+	Counters    []Measurement `json:"counters,omitempty"`
+	MeasureTime int64         `json:"measure_time"`
+	Source      string        `json:"source"`
+}
+
+func (self *LibratoClient) PostMetrics(batch Batch) (err error) {
+	var (
+		js   []byte
+		req  *http.Request
+		resp *http.Response
+	)
+
+	if len(batch.Counters) == 0 && len(batch.Gauges) == 0 {
+		return nil
+	}
+
+	if js, err = json.Marshal(batch); err != nil {
+		return
+	}
+
+	if req, err = http.NewRequest("POST", MetricsPostUrl, bytes.NewBuffer(js)); err != nil {
+		return
+	}
+
+	req.Header.Set("Content-Type", "application/json")
+	req.SetBasicAuth(self.Email, self.Token)
+
+	if resp, err = http.DefaultClient.Do(req); err != nil {
+		return
+	}
+
+	if resp.StatusCode != http.StatusOK {
+		var body []byte
+		if body, err = ioutil.ReadAll(resp.Body); err != nil {
+			body = []byte(fmt.Sprintf("(could not fetch response body for error: %s)", err))
+		}
+		err = fmt.Errorf("Unable to post to Librato: %d %s %s", resp.StatusCode, resp.Status, string(body))
+	}
+	return
+}
diff --git a/vendor/github.com/rcrowley/go-metrics/librato/librato.go b/vendor/github.com/rcrowley/go-metrics/librato/librato.go
new file mode 100644
index 000000000..d7c057468
--- /dev/null
+++ b/vendor/github.com/rcrowley/go-metrics/librato/librato.go
@@ -0,0 +1,235 @@
+package librato
+
+import (
+	"fmt"
+	"log"
+	"math"
+	"regexp"
+	"time"
+
+	"github.com/rcrowley/go-metrics"
+)
+
+// a regexp for extracting the unit from time.Duration.String
+var unitRegexp = regexp.MustCompile("[^\\d]+$")
+
+// a helper that turns a time.Duration into librato display attributes for timer metrics
+func translateTimerAttributes(d time.Duration) (attrs map[string]interface{}) {
+	attrs = make(map[string]interface{})
+	attrs[DisplayTransform] = fmt.Sprintf("x/%d", int64(d))
+	attrs[DisplayUnitsShort] = string(unitRegexp.Find([]byte(d.String())))
+	return
+}
+
+type Reporter struct {
+	Email, Token    string
+	Namespace       string
+	Source          string
+	Interval        time.Duration
+	Registry        metrics.Registry
+	Percentiles     []float64              // percentiles to report on histogram metrics
+	TimerAttributes map[string]interface{} // units in which timers will be displayed
+	intervalSec     int64
+}
+
+func NewReporter(r metrics.Registry, d time.Duration, e string, t string, s string, p []float64, u time.Duration) *Reporter {
+	return &Reporter{e, t, "", s, d, r, p, translateTimerAttributes(u), int64(d / time.Second)}
+}
+
+func Librato(r metrics.Registry, d time.Duration, e string, t string, s string, p []float64, u time.Duration) {
+	NewReporter(r, d, e, t, s, p, u).Run()
+}
+
+func (self *Reporter) Run() {
+	log.Printf("WARNING: This client has been DEPRECATED! It has been moved to https://github.com/mihasya/go-metrics-librato and will be removed from rcrowley/go-metrics on August 5th 2015")
+	ticker := time.Tick(self.Interval)
+	metricsApi := &LibratoClient{self.Email, self.Token}
+	for now := range ticker {
+		var metrics Batch
+		var err error
+		if metrics, err = self.BuildRequest(now, self.Registry); err != nil {
+			log.Printf("ERROR constructing librato request body %s", err)
+			continue
+		}
+		if err := metricsApi.PostMetrics(metrics); err != nil {
+			log.Printf("ERROR sending metrics to librato %s", err)
+			continue
+		}
+	}
+}
+
+// calculate sum of squares from data provided by metrics.Histogram
+// see http://en.wikipedia.org/wiki/Standard_deviation#Rapid_calculation_methods
+func sumSquares(s metrics.Sample) float64 {
+	count := float64(s.Count())
+	sumSquared := math.Pow(count*s.Mean(), 2)
+	sumSquares := math.Pow(count*s.StdDev(), 2) + sumSquared/count
+	if math.IsNaN(sumSquares) {
+		return 0.0
+	}
+	return sumSquares
+}
+func sumSquaresTimer(t metrics.Timer) float64 {
+	count := float64(t.Count())
+	sumSquared := math.Pow(count*t.Mean(), 2)
+	sumSquares := math.Pow(count*t.StdDev(), 2) + sumSquared/count
+	if math.IsNaN(sumSquares) {
+		return 0.0
+	}
+	return sumSquares
+}
+
+func (self *Reporter) BuildRequest(now time.Time, r metrics.Registry) (snapshot Batch, err error) {
+	snapshot = Batch{
+		// coerce timestamps to a stepping fn so that they line up in Librato graphs
+		MeasureTime: (now.Unix() / self.intervalSec) * self.intervalSec,
+		Source:      self.Source,
+	}
+	snapshot.Gauges = make([]Measurement, 0)
+	snapshot.Counters = make([]Measurement, 0)
+	histogramGaugeCount := 1 + len(self.Percentiles)
+	r.Each(func(name string, metric interface{}) {
+		if self.Namespace != "" {
+			name = fmt.Sprintf("%s.%s", self.Namespace, name)
+		}
+		measurement := Measurement{}
+		measurement[Period] = self.Interval.Seconds()
+		switch m := metric.(type) {
+		case metrics.Counter:
+			if m.Count() > 0 {
+				measurement[Name] = fmt.Sprintf("%s.%s", name, "count")
+				measurement[Value] = float64(m.Count())
+				measurement[Attributes] = map[string]interface{}{
+					DisplayUnitsLong:  Operations,
+					DisplayUnitsShort: OperationsShort,
+					DisplayMin:        "0",
+				}
+				snapshot.Counters = append(snapshot.Counters, measurement)
+			}
+		case metrics.Gauge:
+			measurement[Name] = name
+			measurement[Value] = float64(m.Value())
+			snapshot.Gauges = append(snapshot.Gauges, measurement)
+		case metrics.GaugeFloat64:
+			measurement[Name] = name
+			measurement[Value] = float64(m.Value())
+			snapshot.Gauges = append(snapshot.Gauges, measurement)
+		case metrics.Histogram:
+			if m.Count() > 0 {
+				gauges := make([]Measurement, histogramGaugeCount, histogramGaugeCount)
+				s := m.Sample()
+				measurement[Name] = fmt.Sprintf("%s.%s", name, "hist")
+				measurement[Count] = uint64(s.Count())
+				measurement[Max] = float64(s.Max())
+				measurement[Min] = float64(s.Min())
+				measurement[Sum] = float64(s.Sum())
+				measurement[SumSquares] = sumSquares(s)
+				gauges[0] = measurement
+				for i, p := range self.Percentiles {
+					gauges[i+1] = Measurement{
+						Name:   fmt.Sprintf("%s.%.2f", measurement[Name], p),
+						Value:  s.Percentile(p),
+						Period: measurement[Period],
+					}
+				}
+				snapshot.Gauges = append(snapshot.Gauges, gauges...)
+			}
+		case metrics.Meter:
+			measurement[Name] = name
+			measurement[Value] = float64(m.Count())
+			snapshot.Counters = append(snapshot.Counters, measurement)
+			snapshot.Gauges = append(snapshot.Gauges,
+				Measurement{
+					Name:   fmt.Sprintf("%s.%s", name, "1min"),
+					Value:  m.Rate1(),
+					Period: int64(self.Interval.Seconds()),
+					Attributes: map[string]interface{}{
+						DisplayUnitsLong:  Operations,
+						DisplayUnitsShort: OperationsShort,
+						DisplayMin:        "0",
+					},
+				},
+				Measurement{
+					Name:   fmt.Sprintf("%s.%s", name, "5min"),
+					Value:  m.Rate5(),
+					Period: int64(self.Interval.Seconds()),
+					Attributes: map[string]interface{}{
+						DisplayUnitsLong:  Operations,
+						DisplayUnitsShort: OperationsShort,
+						DisplayMin:        "0",
+					},
+				},
+				Measurement{
+					Name:   fmt.Sprintf("%s.%s", name, "15min"),
+					Value:  m.Rate15(),
+					Period: int64(self.Interval.Seconds()),
+					Attributes: map[string]interface{}{
+						DisplayUnitsLong:  Operations,
+						DisplayUnitsShort: OperationsShort,
+						DisplayMin:        "0",
+					},
+				},
+			)
+		case metrics.Timer:
+			measurement[Name] = name
+			measurement[Value] = float64(m.Count())
+			snapshot.Counters = append(snapshot.Counters, measurement)
+			if m.Count() > 0 {
+				libratoName := fmt.Sprintf("%s.%s", name, "timer.mean")
+				gauges := make([]Measurement, histogramGaugeCount, histogramGaugeCount)
+				gauges[0] = Measurement{
+					Name:       libratoName,
+					Count:      uint64(m.Count()),
+					Sum:        m.Mean() * float64(m.Count()),
+					Max:        float64(m.Max()),
+					Min:        float64(m.Min()),
+					SumSquares: sumSquaresTimer(m),
+					Period:     int64(self.Interval.Seconds()),
+					Attributes: self.TimerAttributes,
+				}
+				for i, p := range self.Percentiles {
+					gauges[i+1] = Measurement{
+						Name:       fmt.Sprintf("%s.timer.%2.0f", name, p*100),
+						Value:      m.Percentile(p),
+						Period:     int64(self.Interval.Seconds()),
+						Attributes: self.TimerAttributes,
+					}
+				}
+				snapshot.Gauges = append(snapshot.Gauges, gauges...)
+				snapshot.Gauges = append(snapshot.Gauges,
+					Measurement{
+						Name:   fmt.Sprintf("%s.%s", name, "rate.1min"),
+						Value:  m.Rate1(),
+						Period: int64(self.Interval.Seconds()),
+						Attributes: map[string]interface{}{
+							DisplayUnitsLong:  Operations,
+							DisplayUnitsShort: OperationsShort,
+							DisplayMin:        "0",
+						},
+					},
+					Measurement{
+						Name:   fmt.Sprintf("%s.%s", name, "rate.5min"),
+						Value:  m.Rate5(),
+						Period: int64(self.Interval.Seconds()),
+						Attributes: map[string]interface{}{
+							DisplayUnitsLong:  Operations,
+							DisplayUnitsShort: OperationsShort,
+							DisplayMin:        "0",
+						},
+					},
+					Measurement{
+						Name:   fmt.Sprintf("%s.%s", name, "rate.15min"),
+						Value:  m.Rate15(),
+						Period: int64(self.Interval.Seconds()),
+						Attributes: map[string]interface{}{
+							DisplayUnitsLong:  Operations,
+							DisplayUnitsShort: OperationsShort,
+							DisplayMin:        "0",
+						},
+					},
+				)
+			}
+		}
+	})
+	return
+}
diff --git a/vendor/github.com/rcrowley/go-metrics/log.go b/vendor/github.com/rcrowley/go-metrics/log.go
index f074eb03d..f8074c045 100644
--- a/vendor/github.com/rcrowley/go-metrics/log.go
+++ b/vendor/github.com/rcrowley/go-metrics/log.go
@@ -1,17 +1,20 @@
 package metrics
 
 import (
-	"log"
 	"time"
 )
 
-func Log(r Registry, freq time.Duration, l *log.Logger) {
+type Logger interface {
+	Printf(format string, v ...interface{})
+}
+
+func Log(r Registry, freq time.Duration, l Logger) {
 	LogScaled(r, freq, time.Nanosecond, l)
 }
 
 // Output each metric in the given registry periodically using the given
 // logger. Print timings in `scale` units (eg time.Millisecond) rather than nanos.
-func LogScaled(r Registry, freq time.Duration, scale time.Duration, l *log.Logger) {
+func LogScaled(r Registry, freq time.Duration, scale time.Duration, l Logger) {
 	du := float64(scale)
 	duSuffix := scale.String()[1:]
 
diff --git a/vendor/github.com/rcrowley/go-metrics/registry.go b/vendor/github.com/rcrowley/go-metrics/registry.go
index e1f68a5dc..9086dcbdd 100644
--- a/vendor/github.com/rcrowley/go-metrics/registry.go
+++ b/vendor/github.com/rcrowley/go-metrics/registry.go
@@ -3,6 +3,7 @@ package metrics
 import (
 	"fmt"
 	"reflect"
+	"strings"
 	"sync"
 )
 
@@ -166,12 +167,34 @@ func NewPrefixedChildRegistry(parent Registry, prefix string) Registry {
 
 // Call the given function for each registered metric.
 func (r *PrefixedRegistry) Each(fn func(string, interface{})) {
-	r.underlying.Each(fn)
+	wrappedFn := func (prefix string) func(string, interface{}) {
+		return func(name string, iface interface{}) {
+			if strings.HasPrefix(name,prefix) {
+				fn(name, iface)
+			} else {
+				return
+			}
+		}
+	}
+
+	baseRegistry, prefix := findPrefix(r, "")
+	baseRegistry.Each(wrappedFn(prefix))
+}
+
+func findPrefix(registry Registry, prefix string) (Registry, string) {
+	switch r := registry.(type) {
+	case *PrefixedRegistry:
+		return findPrefix(r.underlying, r.prefix + prefix)
+	case *StandardRegistry:
+		return r, prefix
+	}
+	return nil, ""
 }
 
 // Get the metric by the given name or nil if none is registered.
 func (r *PrefixedRegistry) Get(name string) interface{} {
-	return r.underlying.Get(name)
+	realName := r.prefix + name
+	return r.underlying.Get(realName)
 }
 
 // Gets an existing metric or registers the given one.
diff --git a/vendor/github.com/rcrowley/go-metrics/stathat/stathat.go b/vendor/github.com/rcrowley/go-metrics/stathat/stathat.go
new file mode 100644
index 000000000..0afcb4848
--- /dev/null
+++ b/vendor/github.com/rcrowley/go-metrics/stathat/stathat.go
@@ -0,0 +1,69 @@
+// Metrics output to StatHat.
+package stathat
+
+import (
+	"github.com/rcrowley/go-metrics"
+	"github.com/stathat/go"
+	"log"
+	"time"
+)
+
+func Stathat(r metrics.Registry, d time.Duration, userkey string) {
+	for {
+		if err := sh(r, userkey); nil != err {
+			log.Println(err)
+		}
+		time.Sleep(d)
+	}
+}
+
+func sh(r metrics.Registry, userkey string) error {
+	r.Each(func(name string, i interface{}) {
+		switch metric := i.(type) {
+		case metrics.Counter:
+			stathat.PostEZCount(name, userkey, int(metric.Count()))
+		case metrics.Gauge:
+			stathat.PostEZValue(name, userkey, float64(metric.Value()))
+		case metrics.GaugeFloat64:
+			stathat.PostEZValue(name, userkey, float64(metric.Value()))
+		case metrics.Histogram:
+			h := metric.Snapshot()
+			ps := h.Percentiles([]float64{0.5, 0.75, 0.95, 0.99, 0.999})
+			stathat.PostEZCount(name+".count", userkey, int(h.Count()))
+			stathat.PostEZValue(name+".min", userkey, float64(h.Min()))
+			stathat.PostEZValue(name+".max", userkey, float64(h.Max()))
+			stathat.PostEZValue(name+".mean", userkey, float64(h.Mean()))
+			stathat.PostEZValue(name+".std-dev", userkey, float64(h.StdDev()))
+			stathat.PostEZValue(name+".50-percentile", userkey, float64(ps[0]))
+			stathat.PostEZValue(name+".75-percentile", userkey, float64(ps[1]))
+			stathat.PostEZValue(name+".95-percentile", userkey, float64(ps[2]))
+			stathat.PostEZValue(name+".99-percentile", userkey, float64(ps[3]))
+			stathat.PostEZValue(name+".999-percentile", userkey, float64(ps[4]))
+		case metrics.Meter:
+			m := metric.Snapshot()
+			stathat.PostEZCount(name+".count", userkey, int(m.Count()))
+			stathat.PostEZValue(name+".one-minute", userkey, float64(m.Rate1()))
+			stathat.PostEZValue(name+".five-minute", userkey, float64(m.Rate5()))
+			stathat.PostEZValue(name+".fifteen-minute", userkey, float64(m.Rate15()))
+			stathat.PostEZValue(name+".mean", userkey, float64(m.RateMean()))
+		case metrics.Timer:
+			t := metric.Snapshot()
+			ps := t.Percentiles([]float64{0.5, 0.75, 0.95, 0.99, 0.999})
+			stathat.PostEZCount(name+".count", userkey, int(t.Count()))
+			stathat.PostEZValue(name+".min", userkey, float64(t.Min()))
+			stathat.PostEZValue(name+".max", userkey, float64(t.Max()))
+			stathat.PostEZValue(name+".mean", userkey, float64(t.Mean()))
+			stathat.PostEZValue(name+".std-dev", userkey, float64(t.StdDev()))
+			stathat.PostEZValue(name+".50-percentile", userkey, float64(ps[0]))
+			stathat.PostEZValue(name+".75-percentile", userkey, float64(ps[1]))
+			stathat.PostEZValue(name+".95-percentile", userkey, float64(ps[2]))
+			stathat.PostEZValue(name+".99-percentile", userkey, float64(ps[3]))
+			stathat.PostEZValue(name+".999-percentile", userkey, float64(ps[4]))
+			stathat.PostEZValue(name+".one-minute", userkey, float64(t.Rate1()))
+			stathat.PostEZValue(name+".five-minute", userkey, float64(t.Rate5()))
+			stathat.PostEZValue(name+".fifteen-minute", userkey, float64(t.Rate15()))
+			stathat.PostEZValue(name+".mean-rate", userkey, float64(t.RateMean()))
+		}
+	})
+	return nil
+}