chore: update dependencies, go version and add latest changes from go-ethereum

discover/common.go

@@ -25,7 +25,6 @@ import (
 	"github.com/ethereum/go-ethereum/p2p/enode"
 	"github.com/ethereum/go-ethereum/p2p/enr"
 	"github.com/ethereum/go-ethereum/p2p/netutil"
-	"github.com/waku-org/go-discover/discover/v5wire"
 )
 
 // UDPConn is a network connection on which discovery can operate.
@@ -46,13 +45,15 @@ type Config struct {
 	PrivateKey *ecdsa.PrivateKey
 
 	// These settings are optional:
-	NetRestrict  *netutil.Netlist      // list of allowed IP networks
-	Bootnodes    []*enode.Node         // list of bootstrap nodes
-	Unhandled    chan<- ReadPacket     // unhandled packets are sent on this channel
-	Log          log.Logger            // if set, log messages go here
-	ValidSchemes enr.IdentityScheme    // allowed identity schemes
-	V5Config     V5Config              // DiscV5 settings
-	ValidNodeFn  func(enode.Node) bool // function to validate a node before it's added to routing tables
+	NetRestrict *netutil.Netlist  // list of allowed IP networks
+	Bootnodes   []*enode.Node     // list of bootstrap nodes
+	Unhandled   chan<- ReadPacket // unhandled packets are sent on this channel
+	Log         log.Logger        // if set, log messages go here
+
+	// V5ProtocolID configures the discv5 protocol identifier.
+	V5ProtocolID *[6]byte
+
+	ValidSchemes enr.IdentityScheme // allowed identity schemes
 	Clock        mclock.Clock
 }
 
@@ -66,9 +67,6 @@ func (cfg Config) withDefaults() Config {
 	if cfg.Clock == nil {
 		cfg.Clock = mclock.System{}
 	}
-	if cfg.V5Config.ProtocolID == nil {
-		cfg.V5Config.ProtocolID = &v5wire.DefaultProtocolID
-	}
 	return cfg
 }
 

discover/metrics.go

@@ -0,0 +1,65 @@
+// Copyright 2023 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 discover
+
+import (
+	"net"
+
+	"github.com/ethereum/go-ethereum/metrics"
+)
+
+const (
+	moduleName = "discover"
+	// ingressMeterName is the prefix of the per-packet inbound metrics.
+	ingressMeterName = moduleName + "/ingress"
+
+	// egressMeterName is the prefix of the per-packet outbound metrics.
+	egressMeterName = moduleName + "/egress"
+)
+
+var (
+	ingressTrafficMeter = metrics.NewRegisteredMeter(ingressMeterName, nil)
+	egressTrafficMeter  = metrics.NewRegisteredMeter(egressMeterName, nil)
+)
+
+// meteredConn is a wrapper around a net.UDPConn that meters both the
+// inbound and outbound network traffic.
+type meteredUdpConn struct {
+	UDPConn
+}
+
+func newMeteredConn(conn UDPConn) UDPConn {
+	// Short circuit if metrics are disabled
+	if !metrics.Enabled {
+		return conn
+	}
+	return &meteredUdpConn{UDPConn: conn}
+}
+
+// Read delegates a network read to the underlying connection, bumping the udp ingress traffic meter along the way.
+func (c *meteredUdpConn) ReadFromUDP(b []byte) (n int, addr *net.UDPAddr, err error) {
+	n, addr, err = c.UDPConn.ReadFromUDP(b)
+	ingressTrafficMeter.Mark(int64(n))
+	return n, addr, err
+}
+
+// Write delegates a network write to the underlying connection, bumping the udp egress traffic meter along the way.
+func (c *meteredUdpConn) WriteToUDP(b []byte, addr *net.UDPAddr) (n int, err error) {
+	n, err = c.UDPConn.WriteToUDP(b, addr)
+	egressTrafficMeter.Mark(int64(n))
+	return n, err
+}

discover/table.go

@@ -79,8 +79,6 @@ type Table struct {
 	closeReq   chan struct{}
 	closed     chan struct{}
 
-	nodeIsValidFn func(enode.Node) bool
-
 	nodeAddedHook func(*node) // for testing
 }
 
@@ -101,18 +99,17 @@ type bucket struct {
 	ips          netutil.DistinctNetSet
 }
 
-func newTable(t transport, db *enode.DB, bootnodes []*enode.Node, nodeIsValidFn func(enode.Node) bool, log log.Logger) (*Table, error) {
+func newTable(t transport, db *enode.DB, bootnodes []*enode.Node, log log.Logger) (*Table, error) {
 	tab := &Table{
-		net:           t,
-		db:            db,
-		refreshReq:    make(chan chan struct{}),
-		initDone:      make(chan struct{}),
-		closeReq:      make(chan struct{}),
-		closed:        make(chan struct{}),
-		rand:          mrand.New(mrand.NewSource(0)),
-		ips:           netutil.DistinctNetSet{Subnet: tableSubnet, Limit: tableIPLimit},
-		nodeIsValidFn: nodeIsValidFn,
-		log:           log,
+		net:        t,
+		db:         db,
+		refreshReq: make(chan chan struct{}),
+		initDone:   make(chan struct{}),
+		closeReq:   make(chan struct{}),
+		closed:     make(chan struct{}),
+		rand:       mrand.New(mrand.NewSource(0)),
+		ips:        netutil.DistinctNetSet{Subnet: tableSubnet, Limit: tableIPLimit},
+		log:        log,
 	}
 	if err := tab.setFallbackNodes(bootnodes); err != nil {
 		return nil, err
@@ -468,10 +465,6 @@ func (tab *Table) addSeenNode(n *node) {
 		return
 	}
 
-	if tab.nodeIsValidFn != nil && !tab.nodeIsValidFn(n.Node) {
-		return
-	}
-
 	tab.mutex.Lock()
 	defer tab.mutex.Unlock()
 	b := tab.bucket(n.ID())
@@ -514,10 +507,6 @@ func (tab *Table) addVerifiedNode(n *node) {
 		return
 	}
 
-	if tab.nodeIsValidFn != nil && !tab.nodeIsValidFn(n.Node) {
-		return
-	}
-
 	tab.mutex.Lock()
 	defer tab.mutex.Unlock()
 	b := tab.bucket(n.ID())
@@ -683,15 +672,14 @@ func (h *nodesByDistance) push(n *node, maxElems int) {
 	ix := sort.Search(len(h.entries), func(i int) bool {
 		return enode.DistCmp(h.target, h.entries[i].ID(), n.ID()) > 0
 	})
+
+	end := len(h.entries)
 	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.
+	if ix < end {
+		// 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
 	}

discover/table_test.go

@@ -314,18 +314,8 @@ func TestTable_addVerifiedNode(t *testing.T) {
 	// Insert two nodes.
 	n1 := nodeAtDistance(tab.self().ID(), 256, net.IP{88, 77, 66, 1})
 	n2 := nodeAtDistance(tab.self().ID(), 256, net.IP{88, 77, 66, 2})
-	n3 := nodeAtDistance(tab.self().ID(), 256, net.IP{66, 77, 88, 3})
-
-	// Check if node is valid before adding it
-	validFN := func(node enode.Node) bool {
-		return !node.IP().Equal(n3.IP()) // Node 3 is invalid
-	}
-
-	tab.nodeIsValidFn = validFN
-
 	tab.addSeenNode(n1)
 	tab.addSeenNode(n2)
-	tab.addVerifiedNode(n3)
 
 	// Verify bucket content:
 	bcontent := []*node{n1, n2}
@@ -353,24 +343,14 @@ func TestTable_addSeenNode(t *testing.T) {
 	defer db.Close()
 	defer tab.close()
 
-	// Insert three nodes.
+	// Insert two nodes.
 	n1 := nodeAtDistance(tab.self().ID(), 256, net.IP{88, 77, 66, 1})
 	n2 := nodeAtDistance(tab.self().ID(), 256, net.IP{88, 77, 66, 2})
-	n3 := nodeAtDistance(tab.self().ID(), 256, net.IP{66, 77, 88, 3})
-
-	// Check if node is valid before adding it
-	validFN := func(node enode.Node) bool {
-		return !node.IP().Equal(n3.IP()) // Node 3 is invalid
-	}
-
-	tab.nodeIsValidFn = validFN
-
 	tab.addSeenNode(n1)
 	tab.addSeenNode(n2)
-	tab.addSeenNode(n3)
 
 	// Verify bucket content:
-	bcontent := []*node{n1, n2} // n3 shouldnt have been added
+	bcontent := []*node{n1, n2}
 	if !reflect.DeepEqual(tab.bucket(n1.ID()).entries, bcontent) {
 		t.Fatalf("wrong bucket content: %v", tab.bucket(n1.ID()).entries)
 	}
@@ -416,6 +396,59 @@ func TestTable_revalidateSyncRecord(t *testing.T) {
 	}
 }
 
+func TestNodesPush(t *testing.T) {
+	var target enode.ID
+	n1 := nodeAtDistance(target, 255, intIP(1))
+	n2 := nodeAtDistance(target, 254, intIP(2))
+	n3 := nodeAtDistance(target, 253, intIP(3))
+	perm := [][]*node{
+		{n3, n2, n1},
+		{n3, n1, n2},
+		{n2, n3, n1},
+		{n2, n1, n3},
+		{n1, n3, n2},
+		{n1, n2, n3},
+	}
+
+	// Insert all permutations into lists with size limit 3.
+	for _, nodes := range perm {
+		list := nodesByDistance{target: target}
+		for _, n := range nodes {
+			list.push(n, 3)
+		}
+		if !slicesEqual(list.entries, perm[0], nodeIDEqual) {
+			t.Fatal("not equal")
+		}
+	}
+
+	// Insert all permutations into lists with size limit 2.
+	for _, nodes := range perm {
+		list := nodesByDistance{target: target}
+		for _, n := range nodes {
+			list.push(n, 2)
+		}
+		if !slicesEqual(list.entries, perm[0][:2], nodeIDEqual) {
+			t.Fatal("not equal")
+		}
+	}
+}
+
+func nodeIDEqual(n1, n2 *node) bool {
+	return n1.ID() == n2.ID()
+}
+
+func slicesEqual[T any](s1, s2 []T, check func(e1, e2 T) bool) bool {
+	if len(s1) != len(s2) {
+		return false
+	}
+	for i := range s1 {
+		if !check(s1[i], s2[i]) {
+			return false
+		}
+	}
+	return true
+}
+
 // gen wraps quick.Value so it's easier to use.
 // it generates a random value of the given value's type.
 func gen(typ interface{}, rand *rand.Rand) interface{} {

discover/table_util_test.go

@@ -43,7 +43,7 @@ func init() {
 
 func newTestTable(t transport) (*Table, *enode.DB) {
 	db, _ := enode.OpenDB("")
-	tab, _ := newTable(t, db, nil, nil, log.Root())
+	tab, _ := newTable(t, db, nil, log.Root())
 	go tab.loop()
 	return tab, db
 }
@@ -52,6 +52,7 @@ func newTestTable(t transport) (*Table, *enode.DB) {
 func nodeAtDistance(base enode.ID, ld int, ip net.IP) *node {
 	var r enr.Record
 	r.Set(enr.IP(ip))
+	r.Set(enr.UDP(30303))
 	return wrapNode(enode.SignNull(&r, idAtDistance(base, ld)))
 }
 
@@ -174,7 +175,7 @@ func (t *pingRecorder) RequestENR(n *enode.Node) (*enode.Node, error) {
 }
 
 func hasDuplicates(slice []*node) bool {
-	seen := make(map[enode.ID]bool)
+	seen := make(map[enode.ID]bool, len(slice))
 	for i, e := range slice {
 		if e == nil {
 			panic(fmt.Sprintf("nil *Node at %d", i))

discover/v4_udp.go

@@ -130,7 +130,7 @@ func ListenV4(c UDPConn, ln *enode.LocalNode, cfg Config) (*UDPv4, error) {
 	cfg = cfg.withDefaults()
 	closeCtx, cancel := context.WithCancel(context.Background())
 	t := &UDPv4{
-		conn:            c,
+		conn:            newMeteredConn(c),
 		priv:            cfg.PrivateKey,
 		netrestrict:     cfg.NetRestrict,
 		localNode:       ln,
@@ -142,7 +142,7 @@ func ListenV4(c UDPConn, ln *enode.LocalNode, cfg Config) (*UDPv4, error) {
 		log:             cfg.Log,
 	}
 
-	tab, err := newTable(t, ln.Database(), cfg.Bootnodes, cfg.ValidNodeFn, t.log)
+	tab, err := newTable(t, ln.Database(), cfg.Bootnodes, t.log)
 	if err != nil {
 		return nil, err
 	}

discover/v4_udp_test.go

@@ -165,7 +165,6 @@ func TestUDPv4_responseTimeouts(t *testing.T) {
 	test := newUDPTest(t)
 	defer test.close()
 
-	rand.Seed(time.Now().UnixNano())
 	randomDuration := func(max time.Duration) time.Duration {
 		return time.Duration(rand.Int63n(int64(max)))
 	}

discover/v5_talk.go

@@ -0,0 +1,113 @@
+// Copyright 2023 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 discover
+
+import (
+	"net"
+	"sync"
+	"time"
+
+	"github.com/ethereum/go-ethereum/log"
+	"github.com/ethereum/go-ethereum/p2p/enode"
+	"github.com/waku-org/go-discover/discover/v5wire"
+)
+
+// This is a limit for the number of concurrent talk requests.
+const maxActiveTalkRequests = 1024
+
+// This is the timeout for acquiring a handler execution slot for a talk request.
+// The timeout should be short enough to fit within the request timeout.
+const talkHandlerLaunchTimeout = 400 * time.Millisecond
+
+// TalkRequestHandler callback processes a talk request and returns a response.
+//
+// Note that talk handlers are expected to come up with a response very quickly, within at
+// most 200ms or so. If the handler takes longer than that, the remote end may time out
+// and wont receive the response.
+type TalkRequestHandler func(enode.ID, *net.UDPAddr, []byte) []byte
+
+type talkSystem struct {
+	transport *UDPv5
+
+	mutex     sync.Mutex
+	handlers  map[string]TalkRequestHandler
+	slots     chan struct{}
+	lastLog   time.Time
+	dropCount int
+}
+
+func newTalkSystem(transport *UDPv5) *talkSystem {
+	t := &talkSystem{
+		transport: transport,
+		handlers:  make(map[string]TalkRequestHandler),
+		slots:     make(chan struct{}, maxActiveTalkRequests),
+	}
+	for i := 0; i < cap(t.slots); i++ {
+		t.slots <- struct{}{}
+	}
+	return t
+}
+
+// register adds a protocol handler.
+func (t *talkSystem) register(protocol string, handler TalkRequestHandler) {
+	t.mutex.Lock()
+	t.handlers[protocol] = handler
+	t.mutex.Unlock()
+}
+
+// handleRequest handles a talk request.
+func (t *talkSystem) handleRequest(id enode.ID, addr *net.UDPAddr, req *v5wire.TalkRequest) {
+	t.mutex.Lock()
+	handler, ok := t.handlers[req.Protocol]
+	t.mutex.Unlock()
+
+	if !ok {
+		resp := &v5wire.TalkResponse{ReqID: req.ReqID}
+		t.transport.sendResponse(id, addr, resp)
+		return
+	}
+
+	// Wait for a slot to become available, then run the handler.
+	timeout := time.NewTimer(talkHandlerLaunchTimeout)
+	defer timeout.Stop()
+	select {
+	case <-t.slots:
+		go func() {
+			defer func() { t.slots <- struct{}{} }()
+			respMessage := handler(id, addr, req.Message)
+			resp := &v5wire.TalkResponse{ReqID: req.ReqID, Message: respMessage}
+			t.transport.sendFromAnotherThread(id, addr, resp)
+		}()
+	case <-timeout.C:
+		// Couldn't get it in time, drop the request.
+		if time.Since(t.lastLog) > 5*time.Second {
+			log.Warn("Dropping TALKREQ due to overload", "ndrop", t.dropCount)
+			t.lastLog = time.Now()
+			t.dropCount++
+		}
+	case <-t.transport.closeCtx.Done():
+		// Transport closed, drop the request.
+	}
+}
+
+// wait blocks until all active requests have finished, and prevents new request
+// handlers from being launched.
+func (t *talkSystem) wait() {
+	for i := 0; i < cap(t.slots); i++ {
+		<-t.slots
+	}
+}

discover/v5_udp.go

@@ -24,25 +24,22 @@ import (
 	"errors"
 	"fmt"
 	"io"
-	"math"
 	"net"
 	"sync"
 	"time"
 
-	"github.com/waku-org/go-discover/discover/v5wire"
-
 	"github.com/ethereum/go-ethereum/common/mclock"
 	"github.com/ethereum/go-ethereum/log"
 	"github.com/ethereum/go-ethereum/p2p/enode"
 	"github.com/ethereum/go-ethereum/p2p/enr"
 	"github.com/ethereum/go-ethereum/p2p/netutil"
+	"github.com/waku-org/go-discover/discover/v5wire"
 )
 
 const (
 	lookupRequestLimit      = 3  // max requests against a single node during lookup
 	findnodeResultLimit     = 16 // applies in FINDNODE handler
 	totalNodesResponseLimit = 5  // applies in waitForNodes
-	nodesResponseItemLimit  = 3  // applies in sendNodes
 
 	respTimeoutV5 = 700 * time.Millisecond
 )
@@ -73,9 +70,11 @@ type UDPv5 struct {
 	clock        mclock.Clock
 	validSchemes enr.IdentityScheme
 
+	// misc buffers used during message handling
+	logcontext []interface{}
+
 	// talkreq handler registry
-	trlock     sync.Mutex
-	trhandlers map[string]TalkRequestHandler
+	talk *talkSystem
 
 	// channels into dispatch
 	packetInCh    chan ReadPacket
@@ -83,6 +82,8 @@ type UDPv5 struct {
 	callCh        chan *callV5
 	callDoneCh    chan *callV5
 	respTimeoutCh chan *callTimeout
+	sendCh        chan sendRequest
+	unhandled     chan<- ReadPacket
 
 	// state of dispatch
 	codec            codecV5
@@ -97,12 +98,18 @@ type UDPv5 struct {
 	wg             sync.WaitGroup
 }
 
-// TalkRequestHandler callback processes a talk request and optionally returns a reply
-type TalkRequestHandler func(enode.ID, *net.UDPAddr, []byte) []byte
+type sendRequest struct {
+	destID   enode.ID
+	destAddr *net.UDPAddr
+	msg      v5wire.Packet
+}
 
 // callV5 represents a remote procedure call against another node.
 type callV5 struct {
-	node         *enode.Node
+	id   enode.ID
+	addr *net.UDPAddr
+	node *enode.Node // This is required to perform handshakes.
+
 	packet       v5wire.Packet
 	responseType byte // expected packet type of response
 	reqid        []byte
@@ -141,7 +148,7 @@ func newUDPv5(conn UDPConn, ln *enode.LocalNode, cfg Config) (*UDPv5, error) {
 	cfg = cfg.withDefaults()
 	t := &UDPv5{
 		// static fields
-		conn:         conn,
+		conn:         newMeteredConn(conn),
 		localNode:    ln,
 		db:           ln.Database(),
 		netrestrict:  cfg.NetRestrict,
@@ -149,15 +156,16 @@ func newUDPv5(conn UDPConn, ln *enode.LocalNode, cfg Config) (*UDPv5, error) {
 		log:          cfg.Log,
 		validSchemes: cfg.ValidSchemes,
 		clock:        cfg.Clock,
-		trhandlers:   make(map[string]TalkRequestHandler),
 		// channels into dispatch
 		packetInCh:    make(chan ReadPacket, 1),
 		readNextCh:    make(chan struct{}, 1),
 		callCh:        make(chan *callV5),
 		callDoneCh:    make(chan *callV5),
+		sendCh:        make(chan sendRequest),
 		respTimeoutCh: make(chan *callTimeout),
+		unhandled:     cfg.Unhandled,
 		// state of dispatch
-		codec:            v5wire.NewCodec(ln, cfg.PrivateKey, cfg.Clock, *cfg.V5Config.ProtocolID),
+		codec:            v5wire.NewCodec(ln, cfg.PrivateKey, cfg.Clock, cfg.V5ProtocolID),
 		activeCallByNode: make(map[enode.ID]*callV5),
 		activeCallByAuth: make(map[v5wire.Nonce]*callV5),
 		callQueue:        make(map[enode.ID][]*callV5),
@@ -165,7 +173,8 @@ func newUDPv5(conn UDPConn, ln *enode.LocalNode, cfg Config) (*UDPv5, error) {
 		closeCtx:       closeCtx,
 		cancelCloseCtx: cancelCloseCtx,
 	}
-	tab, err := newTable(t, t.db, cfg.Bootnodes, cfg.ValidNodeFn, cfg.Log)
+	t.talk = newTalkSystem(t)
+	tab, err := newTable(t, t.db, cfg.Bootnodes, cfg.Log)
 	if err != nil {
 		return nil, err
 	}
@@ -183,6 +192,7 @@ func (t *UDPv5) Close() {
 	t.closeOnce.Do(func() {
 		t.cancelCloseCtx()
 		t.conn.Close()
+		t.talk.wait()
 		t.wg.Wait()
 		t.tab.close()
 	})
@@ -238,15 +248,26 @@ func (t *UDPv5) LocalNode() *enode.LocalNode {
 // whenever a request for the given protocol is received and should return the response
 // data or nil.
 func (t *UDPv5) RegisterTalkHandler(protocol string, handler TalkRequestHandler) {
-	t.trlock.Lock()
-	defer t.trlock.Unlock()
-	t.trhandlers[protocol] = handler
+	t.talk.register(protocol, handler)
 }
 
-// TalkRequest sends a talk request to n and waits for a response.
+// TalkRequest sends a talk request to a node and waits for a response.
 func (t *UDPv5) TalkRequest(n *enode.Node, protocol string, request []byte) ([]byte, error) {
 	req := &v5wire.TalkRequest{Protocol: protocol, Message: request}
-	resp := t.call(n, v5wire.TalkResponseMsg, req)
+	resp := t.callToNode(n, v5wire.TalkResponseMsg, req)
+	defer t.callDone(resp)
+	select {
+	case respMsg := <-resp.ch:
+		return respMsg.(*v5wire.TalkResponse).Message, nil
+	case err := <-resp.err:
+		return nil, err
+	}
+}
+
+// TalkRequestToID sends a talk request to a node and waits for a response.
+func (t *UDPv5) TalkRequestToID(id enode.ID, addr *net.UDPAddr, protocol string, request []byte) ([]byte, error) {
+	req := &v5wire.TalkRequest{Protocol: protocol, Message: request}
+	resp := t.callToID(id, addr, v5wire.TalkResponseMsg, req)
 	defer t.callDone(resp)
 	select {
 	case respMsg := <-resp.ch:
@@ -324,7 +345,7 @@ func lookupDistances(target, dest enode.ID) (dists []uint) {
 	td := enode.LogDist(target, dest)
 	dists = append(dists, uint(td))
 	for i := 1; len(dists) < lookupRequestLimit; i++ {
-		if td+i < 256 {
+		if td+i <= 256 {
 			dists = append(dists, uint(td+i))
 		}
 		if td-i > 0 {
@@ -337,7 +358,7 @@ func lookupDistances(target, dest enode.ID) (dists []uint) {
 // ping calls PING on a node and waits for a PONG response.
 func (t *UDPv5) ping(n *enode.Node) (uint64, error) {
 	req := &v5wire.Ping{ENRSeq: t.localNode.Node().Seq()}
-	resp := t.call(n, v5wire.PongMsg, req)
+	resp := t.callToNode(n, v5wire.PongMsg, req)
 	defer t.callDone(resp)
 
 	select {
@@ -362,7 +383,7 @@ func (t *UDPv5) RequestENR(n *enode.Node) (*enode.Node, error) {
 
 // findnode calls FINDNODE on a node and waits for responses.
 func (t *UDPv5) findnode(n *enode.Node, distances []uint) ([]*enode.Node, error) {
-	resp := t.call(n, v5wire.NodesMsg, &v5wire.Findnode{Distances: distances})
+	resp := t.callToNode(n, v5wire.NodesMsg, &v5wire.Findnode{Distances: distances})
 	return t.waitForNodes(resp, distances)
 }
 
@@ -388,7 +409,7 @@ func (t *UDPv5) waitForNodes(c *callV5, distances []uint) ([]*enode.Node, error)
 				nodes = append(nodes, node)
 			}
 			if total == -1 {
-				total = min(int(response.Total), totalNodesResponseLimit)
+				total = min(int(response.RespCount), totalNodesResponseLimit)
 			}
 			if received++; received == total {
 				return nodes, nil
@@ -405,17 +426,17 @@ func (t *UDPv5) verifyResponseNode(c *callV5, r *enr.Record, distances []uint, s
 	if err != nil {
 		return nil, err
 	}
-	if err := netutil.CheckRelayIP(c.node.IP(), node.IP()); err != nil {
+	if err := netutil.CheckRelayIP(c.addr.IP, node.IP()); err != nil {
 		return nil, err
 	}
 	if t.netrestrict != nil && !t.netrestrict.Contains(node.IP()) {
 		return nil, errors.New("not contained in netrestrict list")
 	}
-	if c.node.UDP() <= 1024 {
+	if node.UDP() <= 1024 {
 		return nil, errLowPort
 	}
 	if distances != nil {
-		nd := enode.LogDist(c.node.ID(), node.ID())
+		nd := enode.LogDist(c.id, node.ID())
 		if !containsUint(uint(nd), distances) {
 			return nil, errors.New("does not match any requested distance")
 		}
@@ -436,17 +457,28 @@ func containsUint(x uint, xs []uint) bool {
 	return false
 }
 
-// call sends the given call and sets up a handler for response packets (of message type
-// responseType). Responses are dispatched to the call's response channel.
-func (t *UDPv5) call(node *enode.Node, responseType byte, packet v5wire.Packet) *callV5 {
-	c := &callV5{
-		node:         node,
-		packet:       packet,
-		responseType: responseType,
-		reqid:        make([]byte, 8),
-		ch:           make(chan v5wire.Packet, 1),
-		err:          make(chan error, 1),
-	}
+// callToNode sends the given call and sets up a handler for response packets (of message
+// type responseType). Responses are dispatched to the call's response channel.
+func (t *UDPv5) callToNode(n *enode.Node, responseType byte, req v5wire.Packet) *callV5 {
+	addr := &net.UDPAddr{IP: n.IP(), Port: n.UDP()}
+	c := &callV5{id: n.ID(), addr: addr, node: n}
+	t.initCall(c, responseType, req)
+	return c
+}
+
+// callToID is like callToNode, but for cases where the node record is not available.
+func (t *UDPv5) callToID(id enode.ID, addr *net.UDPAddr, responseType byte, req v5wire.Packet) *callV5 {
+	c := &callV5{id: id, addr: addr}
+	t.initCall(c, responseType, req)
+	return c
+}
+
+func (t *UDPv5) initCall(c *callV5, responseType byte, packet v5wire.Packet) {
+	c.packet = packet
+	c.responseType = responseType
+	c.reqid = make([]byte, 8)
+	c.ch = make(chan v5wire.Packet, 1)
+	c.err = make(chan error, 1)
 	// Assign request ID.
 	crand.Read(c.reqid)
 	packet.SetRequestID(c.reqid)
@@ -456,7 +488,6 @@ func (t *UDPv5) call(node *enode.Node, responseType byte, packet v5wire.Packet)
 	case <-t.closeCtx.Done():
 		c.err <- errClosed
 	}
-	return c
 }
 
 // callDone tells dispatch that the active call is done.
@@ -498,26 +529,27 @@ func (t *UDPv5) dispatch() {
 	for {
 		select {
 		case c := <-t.callCh:
-			id := c.node.ID()
-			t.callQueue[id] = append(t.callQueue[id], c)
-			t.sendNextCall(id)
+			t.callQueue[c.id] = append(t.callQueue[c.id], c)
+			t.sendNextCall(c.id)
 
 		case ct := <-t.respTimeoutCh:
-			active := t.activeCallByNode[ct.c.node.ID()]
+			active := t.activeCallByNode[ct.c.id]
 			if ct.c == active && ct.timer == active.timeout {
 				ct.c.err <- errTimeout
 			}
 
 		case c := <-t.callDoneCh:
-			id := c.node.ID()
-			active := t.activeCallByNode[id]
+			active := t.activeCallByNode[c.id]
 			if active != c {
 				panic("BUG: callDone for inactive call")
 			}
 			c.timeout.Stop()
 			delete(t.activeCallByAuth, c.nonce)
-			delete(t.activeCallByNode, id)
-			t.sendNextCall(id)
+			delete(t.activeCallByNode, c.id)
+			t.sendNextCall(c.id)
+
+		case r := <-t.sendCh:
+			t.send(r.destID, r.destAddr, r.msg, nil)
 
 		case p := <-t.packetInCh:
 			t.handlePacket(p.Data, p.Addr)
@@ -587,8 +619,7 @@ func (t *UDPv5) sendCall(c *callV5) {
 		delete(t.activeCallByAuth, c.nonce)
 	}
 
-	addr := &net.UDPAddr{IP: c.node.IP(), Port: c.node.UDP()}
-	newNonce, _ := t.send(c.node.ID(), addr, c.packet, c.challenge)
+	newNonce, _ := t.send(c.id, c.addr, c.packet, c.challenge)
 	c.nonce = newNonce
 	t.activeCallByAuth[newNonce] = c
 	t.startResponseTimeout(c)
@@ -601,16 +632,28 @@ func (t *UDPv5) sendResponse(toID enode.ID, toAddr *net.UDPAddr, packet v5wire.P
 	return err
 }
 
+func (t *UDPv5) sendFromAnotherThread(toID enode.ID, toAddr *net.UDPAddr, packet v5wire.Packet) {
+	select {
+	case t.sendCh <- sendRequest{toID, toAddr, packet}:
+	case <-t.closeCtx.Done():
+	}
+}
+
 // send sends a packet to the given node.
 func (t *UDPv5) send(toID enode.ID, toAddr *net.UDPAddr, packet v5wire.Packet, c *v5wire.Whoareyou) (v5wire.Nonce, error) {
 	addr := toAddr.String()
+	t.logcontext = append(t.logcontext[:0], "id", toID, "addr", addr)
+	t.logcontext = packet.AppendLogInfo(t.logcontext)
+
 	enc, nonce, err := t.codec.Encode(toID, addr, packet, c)
 	if err != nil {
-		t.log.Warn(">> "+packet.Name(), "id", toID, "addr", addr, "err", err)
+		t.logcontext = append(t.logcontext, "err", err)
+		t.log.Warn(">> "+packet.Name(), t.logcontext...)
 		return nonce, err
 	}
+
 	_, err = t.conn.WriteToUDP(enc, toAddr)
-	t.log.Trace(">> "+packet.Name(), "id", toID, "addr", addr)
+	t.log.Trace(">> "+packet.Name(), t.logcontext...)
 	return nonce, err
 }
 
@@ -651,6 +694,14 @@ func (t *UDPv5) handlePacket(rawpacket []byte, fromAddr *net.UDPAddr) error {
 	addr := fromAddr.String()
 	fromID, fromNode, packet, err := t.codec.Decode(rawpacket, addr)
 	if err != nil {
+		if t.unhandled != nil && v5wire.IsInvalidHeader(err) {
+			// The packet seems unrelated to discv5, send it to the next protocol.
+			// t.log.Trace("Unhandled discv5 packet", "id", fromID, "addr", addr, "err", err)
+			up := ReadPacket{Data: make([]byte, len(rawpacket)), Addr: fromAddr}
+			copy(up.Data, rawpacket)
+			t.unhandled <- up
+			return nil
+		}
 		t.log.Debug("Bad discv5 packet", "id", fromID, "addr", addr, "err", err)
 		return err
 	}
@@ -660,7 +711,9 @@ func (t *UDPv5) handlePacket(rawpacket []byte, fromAddr *net.UDPAddr) error {
 	}
 	if packet.Kind() != v5wire.WhoareyouPacket {
 		// WHOAREYOU logged separately to report errors.
-		t.log.Trace("<< "+packet.Name(), "id", fromID, "addr", addr)
+		t.logcontext = append(t.logcontext[:0], "id", fromID, "addr", addr)
+		t.logcontext = packet.AppendLogInfo(t.logcontext)
+		t.log.Trace("<< "+packet.Name(), t.logcontext...)
 	}
 	t.handle(packet, fromID, fromAddr)
 	return nil
@@ -673,7 +726,7 @@ func (t *UDPv5) handleCallResponse(fromID enode.ID, fromAddr *net.UDPAddr, p v5w
 		t.log.Debug(fmt.Sprintf("Unsolicited/late %s response", p.Name()), "id", fromID, "addr", fromAddr)
 		return false
 	}
-	if !fromAddr.IP.Equal(ac.node.IP()) || fromAddr.Port != ac.node.UDP() {
+	if !fromAddr.IP.Equal(ac.addr.IP) || fromAddr.Port != ac.addr.Port {
 		t.log.Debug(fmt.Sprintf("%s from wrong endpoint", p.Name()), "id", fromID, "addr", fromAddr)
 		return false
 	}
@@ -715,7 +768,7 @@ func (t *UDPv5) handle(p v5wire.Packet, fromID enode.ID, fromAddr *net.UDPAddr)
 	case *v5wire.Nodes:
 		t.handleCallResponse(fromID, fromAddr, p)
 	case *v5wire.TalkRequest:
-		t.handleTalkRequest(p, fromID, fromAddr)
+		t.talk.handleRequest(fromID, fromAddr, p)
 	case *v5wire.TalkResponse:
 		t.handleCallResponse(fromID, fromAddr, p)
 	}
@@ -745,6 +798,12 @@ func (t *UDPv5) handleWhoareyou(p *v5wire.Whoareyou, fromID enode.ID, fromAddr *
 		return
 	}
 
+	if c.node == nil {
+		// Can't perform handshake because we don't have the ENR.
+		t.log.Debug("Can't handle "+p.Name(), "addr", fromAddr, "err", "call has no ENR")
+		c.err <- errors.New("remote wants handshake, but call has no ENR")
+		return
+	}
 	// Resend the call that was answered by WHOAREYOU.
 	t.log.Trace("<< "+p.Name(), "id", c.node.ID(), "addr", fromAddr)
 	c.handshakeCount++
@@ -830,20 +889,32 @@ func (t *UDPv5) collectTableNodes(rip net.IP, distances []uint, limit int) []*en
 // packNodes creates NODES response packets for the given node list.
 func packNodes(reqid []byte, nodes []*enode.Node) []*v5wire.Nodes {
 	if len(nodes) == 0 {
-		return []*v5wire.Nodes{{ReqID: reqid, Total: 1}}
+		return []*v5wire.Nodes{{ReqID: reqid, RespCount: 1}}
 	}
 
-	total := uint8(math.Ceil(float64(len(nodes)) / 3))
+	// This limit represents the available space for nodes in output packets. Maximum
+	// packet size is 1280, and out of this ~80 bytes will be taken up by the packet
+	// frame. So limiting to 1000 bytes here leaves 200 bytes for other fields of the
+	// NODES message, which is a lot.
+	const sizeLimit = 1000
+
 	var resp []*v5wire.Nodes
 	for len(nodes) > 0 {
-		p := &v5wire.Nodes{ReqID: reqid, Total: total}
-		items := min(nodesResponseItemLimit, len(nodes))
-		for i := 0; i < items; i++ {
-			p.Nodes = append(p.Nodes, nodes[i].Record())
+		p := &v5wire.Nodes{ReqID: reqid}
+		size := uint64(0)
+		for len(nodes) > 0 {
+			r := nodes[0].Record()
+			if size += r.Size(); size > sizeLimit {
+				break
+			}
+			p.Nodes = append(p.Nodes, r)
+			nodes = nodes[1:]
 		}
-		nodes = nodes[items:]
 		resp = append(resp, p)
 	}
+	for _, msg := range resp {
+		msg.RespCount = uint8(len(resp))
+	}
 	return resp
 }
 
@@ -857,17 +928,3 @@ func (t *UDPv5) SetFallbackNodes(nodes []*enode.Node) error {
 	<-refreshDone
 	return nil
 }
-
-// handleTalkRequest runs the talk request handler of the requested protocol.
-func (t *UDPv5) handleTalkRequest(p *v5wire.TalkRequest, fromID enode.ID, fromAddr *net.UDPAddr) {
-	t.trlock.Lock()
-	handler := t.trhandlers[p.Protocol]
-	t.trlock.Unlock()
-
-	var response []byte
-	if handler != nil {
-		response = handler(fromID, fromAddr, p.Message)
-	}
-	resp := &v5wire.TalkResponse{ReqID: p.ReqID, Message: response}
-	t.sendResponse(fromID, fromAddr, resp)
-}

discover/v5_udp_test.go

@@ -32,6 +32,7 @@ import (
 	"github.com/ethereum/go-ethereum/p2p/enode"
 	"github.com/ethereum/go-ethereum/p2p/enr"
 	"github.com/ethereum/go-ethereum/rlp"
+	"github.com/stretchr/testify/require"
 	"github.com/waku-org/go-discover/discover/v5wire"
 	"github.com/waku-org/go-discover/internal/testlog"
 )
@@ -160,7 +161,7 @@ func TestUDPv5_findnodeHandling(t *testing.T) {
 	defer test.close()
 
 	// Create test nodes and insert them into the table.
-	nodes253 := nodesAtDistance(test.table.self().ID(), 253, 10)
+	nodes253 := nodesAtDistance(test.table.self().ID(), 253, 16)
 	nodes249 := nodesAtDistance(test.table.self().ID(), 249, 4)
 	nodes248 := nodesAtDistance(test.table.self().ID(), 248, 10)
 	fillTable(test.table, wrapNodes(nodes253))
@@ -185,7 +186,7 @@ func TestUDPv5_findnodeHandling(t *testing.T) {
 
 	// This request gets all the distance-253 nodes.
 	test.packetIn(&v5wire.Findnode{ReqID: []byte{4}, Distances: []uint{253}})
-	test.expectNodes([]byte{4}, 4, nodes253)
+	test.expectNodes([]byte{4}, 2, nodes253)
 
 	// This request gets all the distance-249 nodes and some more at 248 because
 	// the bucket at 249 is not full.
@@ -193,11 +194,11 @@ func TestUDPv5_findnodeHandling(t *testing.T) {
 	var nodes []*enode.Node
 	nodes = append(nodes, nodes249...)
 	nodes = append(nodes, nodes248[:10]...)
-	test.expectNodes([]byte{5}, 5, nodes)
+	test.expectNodes([]byte{5}, 1, nodes)
 }
 
 func (test *udpV5Test) expectNodes(wantReqID []byte, wantTotal uint8, wantNodes []*enode.Node) {
-	nodeSet := make(map[enode.ID]*enr.Record)
+	nodeSet := make(map[enode.ID]*enr.Record, len(wantNodes))
 	for _, n := range wantNodes {
 		nodeSet[n.ID()] = n.Record()
 	}
@@ -207,11 +208,8 @@ func (test *udpV5Test) expectNodes(wantReqID []byte, wantTotal uint8, wantNodes
 			if !bytes.Equal(p.ReqID, wantReqID) {
 				test.t.Fatalf("wrong request ID %v in response, want %v", p.ReqID, wantReqID)
 			}
-			if len(p.Nodes) > 3 {
-				test.t.Fatalf("too many nodes in response")
-			}
-			if p.Total != wantTotal {
-				test.t.Fatalf("wrong total response count %d, want %d", p.Total, wantTotal)
+			if p.RespCount != wantTotal {
+				test.t.Fatalf("wrong total response count %d, want %d", p.RespCount, wantTotal)
 			}
 			for _, record := range p.Nodes {
 				n, _ := enode.New(enode.ValidSchemesForTesting, record)
@@ -303,14 +301,14 @@ func TestUDPv5_findnodeCall(t *testing.T) {
 			t.Fatalf("wrong distances in request: %v", p.Distances)
 		}
 		test.packetIn(&v5wire.Nodes{
-			ReqID: p.ReqID,
-			Total: 2,
-			Nodes: nodesToRecords(nodes[:4]),
+			ReqID:     p.ReqID,
+			RespCount: 2,
+			Nodes:     nodesToRecords(nodes[:4]),
 		})
 		test.packetIn(&v5wire.Nodes{
-			ReqID: p.ReqID,
-			Total: 2,
-			Nodes: nodesToRecords(nodes[4:]),
+			ReqID:     p.ReqID,
+			RespCount: 2,
+			Nodes:     nodesToRecords(nodes[4:]),
 		})
 	})
 
@@ -411,16 +409,16 @@ func TestUDPv5_callTimeoutReset(t *testing.T) {
 	test.waitPacketOut(func(p *v5wire.Findnode, addr *net.UDPAddr, _ v5wire.Nonce) {
 		time.Sleep(respTimeout - 50*time.Millisecond)
 		test.packetIn(&v5wire.Nodes{
-			ReqID: p.ReqID,
-			Total: 2,
-			Nodes: nodesToRecords(nodes[:4]),
+			ReqID:     p.ReqID,
+			RespCount: 2,
+			Nodes:     nodesToRecords(nodes[:4]),
 		})
 
 		time.Sleep(respTimeout - 50*time.Millisecond)
 		test.packetIn(&v5wire.Nodes{
-			ReqID: p.ReqID,
-			Total: 2,
-			Nodes: nodesToRecords(nodes[4:]),
+			ReqID:     p.ReqID,
+			RespCount: 2,
+			Nodes:     nodesToRecords(nodes[4:]),
 		})
 	})
 	if err := <-done; err != nil {
@@ -517,6 +515,63 @@ func TestUDPv5_talkRequest(t *testing.T) {
 	if err := <-done; err != nil {
 		t.Fatal(err)
 	}
+
+	// Also check requesting without ENR.
+	go func() {
+		_, err := test.udp.TalkRequestToID(remote.ID(), test.remoteaddr, "test", []byte("test request 2"))
+		done <- err
+	}()
+	test.waitPacketOut(func(p *v5wire.TalkRequest, addr *net.UDPAddr, _ v5wire.Nonce) {
+		if p.Protocol != "test" {
+			t.Errorf("wrong protocol ID in talk request: %q", p.Protocol)
+		}
+		if string(p.Message) != "test request 2" {
+			t.Errorf("wrong message talk request: %q", p.Message)
+		}
+		test.packetInFrom(test.remotekey, test.remoteaddr, &v5wire.TalkResponse{
+			ReqID:   p.ReqID,
+			Message: []byte("test response 2"),
+		})
+	})
+	if err := <-done; err != nil {
+		t.Fatal(err)
+	}
+}
+
+// This test checks that lookupDistances works.
+func TestUDPv5_lookupDistances(t *testing.T) {
+	test := newUDPV5Test(t)
+	lnID := test.table.self().ID()
+
+	t.Run("target distance of 1", func(t *testing.T) {
+		node := nodeAtDistance(lnID, 1, intIP(0))
+		dists := lookupDistances(lnID, node.ID())
+		require.Equal(t, []uint{1, 2, 3}, dists)
+	})
+
+	t.Run("target distance of 2", func(t *testing.T) {
+		node := nodeAtDistance(lnID, 2, intIP(0))
+		dists := lookupDistances(lnID, node.ID())
+		require.Equal(t, []uint{2, 3, 1}, dists)
+	})
+
+	t.Run("target distance of 128", func(t *testing.T) {
+		node := nodeAtDistance(lnID, 128, intIP(0))
+		dists := lookupDistances(lnID, node.ID())
+		require.Equal(t, []uint{128, 129, 127}, dists)
+	})
+
+	t.Run("target distance of 255", func(t *testing.T) {
+		node := nodeAtDistance(lnID, 255, intIP(0))
+		dists := lookupDistances(lnID, node.ID())
+		require.Equal(t, []uint{255, 256, 254}, dists)
+	})
+
+	t.Run("target distance of 256", func(t *testing.T) {
+		node := nodeAtDistance(lnID, 256, intIP(0))
+		dists := lookupDistances(lnID, node.ID())
+		require.Equal(t, []uint{256, 255, 254}, dists)
+	})
 }
 
 // This test checks that lookup works.

discover/v5wire/encoding.go

@@ -65,7 +65,7 @@ type (
 	handshakeAuthData struct {
 		h struct {
 			SrcID      enode.ID
-			SigSize    byte // ignature data
+			SigSize    byte // signature data
 			PubkeySize byte // offset of
 		}
 		// Trailing variable-size data.
@@ -94,6 +94,8 @@ const (
 	// Should reject packets smaller than minPacketSize.
 	minPacketSize = 63
 
+	maxPacketSize = 1280
+
 	minMessageSize      = 48 // this refers to data after static headers
 	randomPacketMsgSize = 20
 )
@@ -122,6 +124,13 @@ var (
 	ErrInvalidReqID = errors.New("request ID larger than 8 bytes")
 )
 
+// IsInvalidHeader reports whether 'err' is related to an invalid packet header. When it
+// returns false, it is pretty certain that the packet causing the error does not belong
+// to discv5.
+func IsInvalidHeader(err error) bool {
+	return err == errTooShort || err == errInvalidHeader || err == errMsgTooShort
+}
+
 // Packet sizes.
 var (
 	sizeofStaticHeader      = binary.Size(StaticHeader{})
@@ -147,17 +156,22 @@ type Codec struct {
 	msgctbuf []byte       // message data ciphertext
 
 	// decoder buffer
+	decbuf []byte
 	reader bytes.Reader
 }
 
 // NewCodec creates a wire codec.
-func NewCodec(ln *enode.LocalNode, key *ecdsa.PrivateKey, clock mclock.Clock, protocolID [6]byte) *Codec {
+func NewCodec(ln *enode.LocalNode, key *ecdsa.PrivateKey, clock mclock.Clock, protocolID *[6]byte) *Codec {
 	c := &Codec{
 		sha256:     sha256.New(),
 		localnode:  ln,
 		privkey:    key,
 		sc:         NewSessionCache(1024, clock),
-		protocolID: protocolID,
+		protocolID: DefaultProtocolID,
+		decbuf:     make([]byte, maxPacketSize),
+	}
+	if protocolID != nil {
+		c.protocolID = *protocolID
 	}
 	return c
 }
@@ -421,10 +435,13 @@ func (c *Codec) encryptMessage(s *session, p Packet, head *Header, headerData []
 }
 
 // Decode decodes a discovery packet.
-func (c *Codec) Decode(input []byte, addr string) (src enode.ID, n *enode.Node, p Packet, err error) {
-	if len(input) < minPacketSize {
+func (c *Codec) Decode(inputData []byte, addr string) (src enode.ID, n *enode.Node, p Packet, err error) {
+	if len(inputData) < minPacketSize {
 		return enode.ID{}, nil, nil, errTooShort
 	}
+	// Copy the packet to a tmp buffer to avoid modifying it.
+	c.decbuf = append(c.decbuf[:0], inputData...)
+	input := c.decbuf
 	// Unmask the static header.
 	var head Header
 	copy(head.IV[:], input[:sizeofMaskingIV])
@@ -531,7 +548,7 @@ func (c *Codec) decodeHandshake(fromAddr string, head *Header) (n *enode.Node, a
 	if err != nil {
 		return nil, auth, nil, errInvalidAuthKey
 	}
-	// Derive sesssion keys.
+	// Derive session keys.
 	session := deriveKeys(sha256.New, c.privkey, ephkey, auth.h.SrcID, c.localnode.ID(), cdata)
 	session = session.keysFlipped()
 	return n, auth, session, nil

discover/v5wire/encoding_test.go

@@ -92,7 +92,7 @@ func TestHandshake(t *testing.T) {
 	}
 
 	// A <- B   NODES
-	nodes, _ := net.nodeB.encode(t, net.nodeA, &Nodes{Total: 1})
+	nodes, _ := net.nodeB.encode(t, net.nodeA, &Nodes{RespCount: 1})
 	net.nodeA.expectDecode(t, NodesMsg, nodes)
 }
 
@@ -150,7 +150,7 @@ func TestHandshake_norecord(t *testing.T) {
 	net.nodeB.expectDecode(t, FindnodeMsg, findnode)
 
 	// A <- B   NODES
-	nodes, _ := net.nodeB.encode(t, net.nodeA, &Nodes{Total: 1})
+	nodes, _ := net.nodeB.encode(t, net.nodeA, &Nodes{RespCount: 1})
 	net.nodeA.expectDecode(t, NodesMsg, nodes)
 }
 
@@ -190,7 +190,7 @@ func TestHandshake_rekey(t *testing.T) {
 	net.nodeB.expectDecode(t, FindnodeMsg, findnode)
 
 	// A <- B   NODES
-	nodes, _ := net.nodeB.encode(t, net.nodeA, &Nodes{Total: 1})
+	nodes, _ := net.nodeB.encode(t, net.nodeA, &Nodes{RespCount: 1})
 	net.nodeA.expectDecode(t, NodesMsg, nodes)
 }
 
@@ -225,7 +225,7 @@ func TestHandshake_rekey2(t *testing.T) {
 	net.nodeB.expectDecode(t, FindnodeMsg, findnode)
 
 	// A <- B   NODES
-	nodes, _ := net.nodeB.encode(t, net.nodeA, &Nodes{Total: 1})
+	nodes, _ := net.nodeB.encode(t, net.nodeA, &Nodes{RespCount: 1})
 	net.nodeA.expectDecode(t, NodesMsg, nodes)
 }
 
@@ -518,7 +518,7 @@ func (n *handshakeTestNode) init(key *ecdsa.PrivateKey, ip net.IP, clock mclock.
 	db, _ := enode.OpenDB("")
 	n.ln = enode.NewLocalNode(db, key)
 	n.ln.SetStaticIP(ip)
-	n.c = NewCodec(n.ln, key, clock, protocolID)
+	n.c = NewCodec(n.ln, key, clock, nil)
 }
 
 func (n *handshakeTestNode) encode(t testing.TB, to handshakeTestNode, p Packet) ([]byte, Nonce) {

discover/v5wire/msg.go

@@ -20,6 +20,7 @@ import (
 	"fmt"
 	"net"
 
+	"github.com/ethereum/go-ethereum/common/hexutil"
 	"github.com/ethereum/go-ethereum/common/mclock"
 	"github.com/ethereum/go-ethereum/p2p/enode"
 	"github.com/ethereum/go-ethereum/p2p/enr"
@@ -32,6 +33,10 @@ type Packet interface {
 	Kind() byte          // Kind returns the message type.
 	RequestID() []byte   // Returns the request ID.
 	SetRequestID([]byte) // Sets the request ID.
+
+	// AppendLogInfo returns its argument 'ctx' with additional fields
+	// appended for logging purposes.
+	AppendLogInfo(ctx []interface{}) []interface{}
 }
 
 // Message types.
@@ -44,9 +49,6 @@ const (
 	TalkResponseMsg
 	RequestTicketMsg
 	TicketMsg
-	RegtopicMsg
-	RegconfirmationMsg
-	TopicQueryMsg
 
 	UnknownPacket   = byte(255) // any non-decryptable packet
 	WhoareyouPacket = byte(254) // the WHOAREYOU packet
@@ -59,7 +61,7 @@ type (
 		Nonce Nonce
 	}
 
-	// Whoareyou contains the handshake challenge.
+	// WHOAREYOU contains the handshake challenge.
 	Whoareyou struct {
 		ChallengeData []byte   // Encoded challenge
 		Nonce         Nonce    // Nonce of request packet
@@ -73,13 +75,13 @@ type (
 		sent mclock.AbsTime // for handshake GC.
 	}
 
-	// Ping is sent during liveness checks.
+	// PING is sent during liveness checks.
 	Ping struct {
 		ReqID  []byte
 		ENRSeq uint64
 	}
 
-	// Pong is the reply to Ping.
+	// PONG is the reply to PING.
 	Pong struct {
 		ReqID  []byte
 		ENRSeq uint64
@@ -87,62 +89,35 @@ type (
 		ToPort uint16 // packet, which provides a way to discover the external address (after NAT).
 	}
 
-	// Findnode is a query for nodes in the given bucket.
+	// FINDNODE is a query for nodes in the given bucket.
 	Findnode struct {
 		ReqID     []byte
 		Distances []uint
+
+		// OpID is for debugging purposes and is not part of the packet encoding.
+		// It identifies the 'operation' on behalf of which the request was sent.
+		OpID uint64 `rlp:"-"`
 	}
 
-	// Nodes is the reply to Findnode and Topicquery.
+	// NODES is a response to FINDNODE.
 	Nodes struct {
-		ReqID []byte
-		Total uint8
-		Nodes []*enr.Record
+		ReqID     []byte
+		RespCount uint8 // total number of responses to the request
+		Nodes     []*enr.Record
 	}
 
-	// TalkRequest is an application-level request.
+	// TALKREQ is an application-level request.
 	TalkRequest struct {
 		ReqID    []byte
 		Protocol string
 		Message  []byte
 	}
 
-	// TalkResponse is the reply to TalkRequest.
+	// TALKRESP is the reply to TALKREQ.
 	TalkResponse struct {
 		ReqID   []byte
 		Message []byte
 	}
-
-	// RequestTicket requests a ticket for a topic queue.
-	RequestTicket struct {
-		ReqID []byte
-		Topic []byte
-	}
-
-	// Ticket is the response to RequestTicket.
-	Ticket struct {
-		ReqID  []byte
-		Ticket []byte
-	}
-
-	// Regtopic registers the sender in a topic queue using a ticket.
-	Regtopic struct {
-		ReqID  []byte
-		Ticket []byte
-		ENR    *enr.Record
-	}
-
-	// Regconfirmation is the reply to Regtopic.
-	Regconfirmation struct {
-		ReqID      []byte
-		Registered bool
-	}
-
-	// TopicQuery asks for nodes with the given topic.
-	TopicQuery struct {
-		ReqID []byte
-		Topic []byte
-	}
 )
 
 // DecodeMessage decodes the message body of a packet.
@@ -161,16 +136,6 @@ func DecodeMessage(ptype byte, body []byte) (Packet, error) {
 		dec = new(TalkRequest)
 	case TalkResponseMsg:
 		dec = new(TalkResponse)
-	case RequestTicketMsg:
-		dec = new(RequestTicket)
-	case TicketMsg:
-		dec = new(Ticket)
-	case RegtopicMsg:
-		dec = new(Regtopic)
-	case RegconfirmationMsg:
-		dec = new(Regconfirmation)
-	case TopicQueryMsg:
-		dec = new(TopicQuery)
 	default:
 		return nil, fmt.Errorf("unknown packet type %d", ptype)
 	}
@@ -188,62 +153,77 @@ func (*Whoareyou) Kind() byte          { return WhoareyouPacket }
 func (*Whoareyou) RequestID() []byte   { return nil }
 func (*Whoareyou) SetRequestID([]byte) {}
 
+func (*Whoareyou) AppendLogInfo(ctx []interface{}) []interface{} {
+	return ctx
+}
+
 func (*Unknown) Name() string        { return "UNKNOWN/v5" }
 func (*Unknown) Kind() byte          { return UnknownPacket }
 func (*Unknown) RequestID() []byte   { return nil }
 func (*Unknown) SetRequestID([]byte) {}
 
+func (*Unknown) AppendLogInfo(ctx []interface{}) []interface{} {
+	return ctx
+}
+
 func (*Ping) Name() string             { return "PING/v5" }
 func (*Ping) Kind() byte               { return PingMsg }
 func (p *Ping) RequestID() []byte      { return p.ReqID }
 func (p *Ping) SetRequestID(id []byte) { p.ReqID = id }
 
+func (p *Ping) AppendLogInfo(ctx []interface{}) []interface{} {
+	return append(ctx, "req", hexutil.Bytes(p.ReqID), "enrseq", p.ENRSeq)
+}
+
 func (*Pong) Name() string             { return "PONG/v5" }
 func (*Pong) Kind() byte               { return PongMsg }
 func (p *Pong) RequestID() []byte      { return p.ReqID }
 func (p *Pong) SetRequestID(id []byte) { p.ReqID = id }
 
-func (*Findnode) Name() string             { return "FINDNODE/v5" }
-func (*Findnode) Kind() byte               { return FindnodeMsg }
+func (p *Pong) AppendLogInfo(ctx []interface{}) []interface{} {
+	return append(ctx, "req", hexutil.Bytes(p.ReqID), "enrseq", p.ENRSeq)
+}
+
+func (p *Findnode) Name() string           { return "FINDNODE/v5" }
+func (p *Findnode) Kind() byte             { return FindnodeMsg }
 func (p *Findnode) RequestID() []byte      { return p.ReqID }
 func (p *Findnode) SetRequestID(id []byte) { p.ReqID = id }
 
+func (p *Findnode) AppendLogInfo(ctx []interface{}) []interface{} {
+	ctx = append(ctx, "req", hexutil.Bytes(p.ReqID))
+	if p.OpID != 0 {
+		ctx = append(ctx, "opid", p.OpID)
+	}
+	return ctx
+}
+
 func (*Nodes) Name() string             { return "NODES/v5" }
 func (*Nodes) Kind() byte               { return NodesMsg }
 func (p *Nodes) RequestID() []byte      { return p.ReqID }
 func (p *Nodes) SetRequestID(id []byte) { p.ReqID = id }
 
+func (p *Nodes) AppendLogInfo(ctx []interface{}) []interface{} {
+	return append(ctx,
+		"req", hexutil.Bytes(p.ReqID),
+		"tot", p.RespCount,
+		"n", len(p.Nodes),
+	)
+}
+
 func (*TalkRequest) Name() string             { return "TALKREQ/v5" }
 func (*TalkRequest) Kind() byte               { return TalkRequestMsg }
 func (p *TalkRequest) RequestID() []byte      { return p.ReqID }
 func (p *TalkRequest) SetRequestID(id []byte) { p.ReqID = id }
 
+func (p *TalkRequest) AppendLogInfo(ctx []interface{}) []interface{} {
+	return append(ctx, "proto", p.Protocol, "req", hexutil.Bytes(p.ReqID), "len", len(p.Message))
+}
+
 func (*TalkResponse) Name() string             { return "TALKRESP/v5" }
 func (*TalkResponse) Kind() byte               { return TalkResponseMsg }
 func (p *TalkResponse) RequestID() []byte      { return p.ReqID }
 func (p *TalkResponse) SetRequestID(id []byte) { p.ReqID = id }
 
-func (*RequestTicket) Name() string             { return "REQTICKET/v5" }
-func (*RequestTicket) Kind() byte               { return RequestTicketMsg }
-func (p *RequestTicket) RequestID() []byte      { return p.ReqID }
-func (p *RequestTicket) SetRequestID(id []byte) { p.ReqID = id }
-
-func (*Regtopic) Name() string             { return "REGTOPIC/v5" }
-func (*Regtopic) Kind() byte               { return RegtopicMsg }
-func (p *Regtopic) RequestID() []byte      { return p.ReqID }
-func (p *Regtopic) SetRequestID(id []byte) { p.ReqID = id }
-
-func (*Ticket) Name() string             { return "TICKET/v5" }
-func (*Ticket) Kind() byte               { return TicketMsg }
-func (p *Ticket) RequestID() []byte      { return p.ReqID }
-func (p *Ticket) SetRequestID(id []byte) { p.ReqID = id }
-
-func (*Regconfirmation) Name() string             { return "REGCONFIRMATION/v5" }
-func (*Regconfirmation) Kind() byte               { return RegconfirmationMsg }
-func (p *Regconfirmation) RequestID() []byte      { return p.ReqID }
-func (p *Regconfirmation) SetRequestID(id []byte) { p.ReqID = id }
-
-func (*TopicQuery) Name() string             { return "TOPICQUERY/v5" }
-func (*TopicQuery) Kind() byte               { return TopicQueryMsg }
-func (p *TopicQuery) RequestID() []byte      { return p.ReqID }
-func (p *TopicQuery) SetRequestID(id []byte) { p.ReqID = id }
+func (p *TalkResponse) AppendLogInfo(ctx []interface{}) []interface{} {
+	return append(ctx, "req", hexutil.Bytes(p.ReqID), "len", len(p.Message))
+}

discover/v5wire/session.go

@@ -22,10 +22,10 @@ import (
 	"encoding/binary"
 	"time"
 
+	"github.com/ethereum/go-ethereum/common/lru"
 	"github.com/ethereum/go-ethereum/common/mclock"
 	"github.com/ethereum/go-ethereum/crypto"
 	"github.com/ethereum/go-ethereum/p2p/enode"
-	"github.com/hashicorp/golang-lru/simplelru"
 )
 
 const handshakeTimeout = time.Second
@@ -33,7 +33,7 @@ const handshakeTimeout = time.Second
 // The SessionCache keeps negotiated encryption keys and
 // state for in-progress handshakes in the Discovery v5 wire protocol.
 type SessionCache struct {
-	sessions   *simplelru.LRU
+	sessions   lru.BasicLRU[sessionID, *session]
 	handshakes map[sessionID]*Whoareyou
 	clock      mclock.Clock
 
@@ -62,12 +62,8 @@ func (s *session) keysFlipped() *session {
 }
 
 func NewSessionCache(maxItems int, clock mclock.Clock) *SessionCache {
-	cache, err := simplelru.NewLRU(maxItems, nil)
-	if err != nil {
-		panic("can't create session cache")
-	}
 	return &SessionCache{
-		sessions:        cache,
+		sessions:        lru.NewBasicLRU[sessionID, *session](maxItems),
 		handshakes:      make(map[sessionID]*Whoareyou),
 		clock:           clock,
 		nonceGen:        generateNonce,
@@ -95,11 +91,8 @@ func (sc *SessionCache) nextNonce(s *session) (Nonce, error) {
 
 // session returns the current session for the given node, if any.
 func (sc *SessionCache) session(id enode.ID, addr string) *session {
-	item, ok := sc.sessions.Get(sessionID{id, addr})
-	if !ok {
-		return nil
-	}
-	return item.(*session)
+	item, _ := sc.sessions.Get(sessionID{id, addr})
+	return item
 }
 
 // readKey returns the current read key for the given node.

go.mod

@@ -1,10 +1,27 @@
 module github.com/waku-org/go-discover
 
-go 1.15
+go 1.19
 
 require (
 	github.com/davecgh/go-spew v1.1.1
-	github.com/ethereum/go-ethereum v1.10.16
-	github.com/hashicorp/golang-lru v0.5.5-0.20210104140557-80c98217689d
-	golang.org/x/crypto v0.0.0-20220331220935-ae2d96664a29
+	github.com/ethereum/go-ethereum v1.11.6
+	github.com/stretchr/testify v1.8.0
+	golang.org/x/crypto v0.1.0
+)
+
+require (
+	github.com/StackExchange/wmi v0.0.0-20180116203802-5d049714c4a6 // indirect
+	github.com/btcsuite/btcd/btcec/v2 v2.2.0 // indirect
+	github.com/decred/dcrd/dcrec/secp256k1/v4 v4.0.1 // indirect
+	github.com/go-ole/go-ole v1.2.1 // indirect
+	github.com/go-stack/stack v1.8.1 // indirect
+	github.com/golang/snappy v0.0.5-0.20220116011046-fa5810519dcb // indirect
+	github.com/holiman/uint256 v1.2.2-0.20230321075855-87b91420868c // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/shirou/gopsutil v3.21.4-0.20210419000835-c7a38de76ee5+incompatible // indirect
+	github.com/syndtr/goleveldb v1.0.1-0.20210819022825-2ae1ddf74ef7 // indirect
+	github.com/tklauser/go-sysconf v0.3.5 // indirect
+	github.com/tklauser/numcpus v0.2.2 // indirect
+	golang.org/x/sys v0.6.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
 )

go.sum

@@ -1,588 +1,108 @@
-cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
-cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
-cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
-cloud.google.com/go v0.43.0/go.mod h1:BOSR3VbTLkk6FDC/TcffxP4NF/FFBGA5ku+jvKOP7pg=
-cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU=
-cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY=
-cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc=
-cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0=
-cloud.google.com/go v0.50.0/go.mod h1:r9sluTvynVuxRIOHXQEHMFffphuXHOMZMycpNR5e6To=
-cloud.google.com/go v0.51.0/go.mod h1:hWtGJ6gnXH+KgDv+V0zFGDvpi07n3z8ZNj3T1RW0Gcw=
-cloud.google.com/go/bigquery v1.0.1/go.mod h1:i/xbL2UlR5RvWAURpBYZTtm/cXjCha9lbfbpx4poX+o=
-cloud.google.com/go/bigquery v1.3.0/go.mod h1:PjpwJnslEMmckchkHFfq+HTD2DmtT67aNFKH1/VBDHE=
-cloud.google.com/go/bigtable v1.2.0/go.mod h1:JcVAOl45lrTmQfLj7T6TxyMzIN/3FGGcFm+2xVAli2o=
-cloud.google.com/go/datastore v1.0.0/go.mod h1:LXYbyblFSglQ5pkeyhO+Qmw7ukd3C+pD7TKLgZqpHYE=
-cloud.google.com/go/pubsub v1.0.1/go.mod h1:R0Gpsv3s54REJCy4fxDixWD93lHJMoZTyQ2kNxGRt3I=
-cloud.google.com/go/pubsub v1.1.0/go.mod h1:EwwdRX2sKPjnvnqCa270oGRyludottCI76h+R3AArQw=
-cloud.google.com/go/storage v1.0.0/go.mod h1:IhtSnM/ZTZV8YYJWCY8RULGVqBDmpoyjwiyrjsg+URw=
-cloud.google.com/go/storage v1.5.0/go.mod h1:tpKbwo567HUNpVclU5sGELwQWBDZ8gh0ZeosJ0Rtdos=
-collectd.org v0.3.0/go.mod h1:A/8DzQBkF6abtvrT2j/AU/4tiBgJWYyh0y/oB/4MlWE=
-dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
-github.com/Azure/azure-pipeline-go v0.2.1/go.mod h1:UGSo8XybXnIGZ3epmeBw7Jdz+HiUVpqIlpz/HKHylF4=
-github.com/Azure/azure-pipeline-go v0.2.2/go.mod h1:4rQ/NZncSvGqNkkOsNpOU1tgoNuIlp9AfUH5G1tvCHc=
-github.com/Azure/azure-storage-blob-go v0.7.0/go.mod h1:f9YQKtsG1nMisotuTPpO0tjNuEjKRYAcJU8/ydDI++4=
-github.com/Azure/go-autorest/autorest v0.9.0/go.mod h1:xyHB1BMZT0cuDHU7I0+g046+BFDTQ8rEZB0s4Yfa6bI=
-github.com/Azure/go-autorest/autorest/adal v0.5.0/go.mod h1:8Z9fGy2MpX0PvDjB1pEgQTmVqjGhiHBW7RJJEciWzS0=
-github.com/Azure/go-autorest/autorest/adal v0.8.0/go.mod h1:Z6vX6WXXuyieHAXwMj0S6HY6e6wcHn37qQMBQlvY3lc=
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-github.com/Azure/go-autorest/autorest/date v0.2.0/go.mod h1:vcORJHLJEh643/Ioh9+vPmf1Ij9AEBM5FuBIXLmIy0g=
-github.com/Azure/go-autorest/autorest/mocks v0.1.0/go.mod h1:OTyCOPRA2IgIlWxVYxBee2F5Gr4kF2zd2J5cFRaIDN0=
-github.com/Azure/go-autorest/autorest/mocks v0.2.0/go.mod h1:OTyCOPRA2IgIlWxVYxBee2F5Gr4kF2zd2J5cFRaIDN0=
-github.com/Azure/go-autorest/autorest/mocks v0.3.0/go.mod h1:a8FDP3DYzQ4RYfVAxAN3SVSiiO77gL2j2ronKKP0syM=
-github.com/Azure/go-autorest/logger v0.1.0/go.mod h1:oExouG+K6PryycPJfVSxi/koC6LSNgds39diKLz7Vrc=
-github.com/Azure/go-autorest/tracing v0.5.0/go.mod h1:r/s2XiOKccPW3HrqB+W0TQzfbtp2fGCgRFtBroKn4Dk=
-github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
-github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
-github.com/DATA-DOG/go-sqlmock v1.3.3/go.mod h1:f/Ixk793poVmq4qj/V1dPUg2JEAKC73Q5eFN3EC/SaM=
-github.com/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAElWljhcU=
+github.com/StackExchange/wmi v0.0.0-20180116203802-5d049714c4a6 h1:fLjPD/aNc3UIOA6tDi6QXUemppXK3P9BI7mr2hd6gx8=
 github.com/StackExchange/wmi v0.0.0-20180116203802-5d049714c4a6/go.mod h1:3eOhrUMpNV+6aFIbp5/iudMxNCF27Vw2OZgy4xEx0Fg=
-github.com/VictoriaMetrics/fastcache v1.6.0/go.mod h1:0qHz5QP0GMX4pfmMA/zt5RgfNuXJrTP0zS7DqpHGGTw=
-github.com/aead/siphash v1.0.1/go.mod h1:Nywa3cDsYNNK3gaciGTWPwHt0wlpNV15vwmswBAUSII=
-github.com/ajstarks/svgo v0.0.0-20180226025133-644b8db467af/go.mod h1:K08gAheRH3/J6wwsYMMT4xOr94bZjxIelGM0+d/wbFw=
-github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
-github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
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