status-go/geth/node.go

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package geth
import (
"encoding/json"
"errors"
"fmt"
"io"
"os"
"path"
"path/filepath"
"reflect"
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"runtime/debug"
"strings"
"syscall"
"github.com/ethereum/go-ethereum/core"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/eth"
"github.com/ethereum/go-ethereum/eth/downloader"
"github.com/ethereum/go-ethereum/les"
"github.com/ethereum/go-ethereum/log"
"github.com/ethereum/go-ethereum/node"
"github.com/ethereum/go-ethereum/p2p"
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"github.com/ethereum/go-ethereum/p2p/discover"
"github.com/ethereum/go-ethereum/p2p/discv5"
"github.com/ethereum/go-ethereum/p2p/nat"
"github.com/ethereum/go-ethereum/whisper/mailserver"
"github.com/ethereum/go-ethereum/whisper/notifications"
whisper "github.com/ethereum/go-ethereum/whisper/whisperv5"
"github.com/status-im/status-go/geth/params"
)
const (
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EventNodeStarted = "node.started"
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EventNodeCrashed = "node.crashed"
)
// node-related errors
var (
ErrEthServiceRegistrationFailure = errors.New("failed to register the Ethereum service")
ErrSshServiceRegistrationFailure = errors.New("failed to register the Whisper service")
ErrLightEthRegistrationFailure = errors.New("failed to register the LES service")
)
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// Node represents running node (serves as a wrapper around P2P node)
type Node struct {
config *params.NodeConfig // configuration used to create Status node
geth *node.Node // reference to the running Geth node
gethConfig *node.Config // configuration used to create P2P node
started chan struct{} // channel to wait for node to start
}
// Inited checks whether status node has been properly initialized
func (n *Node) Inited() bool {
return n != nil && n.geth != nil
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}
// GethStack returns reference to Geth stack
func (n *Node) GethStack() *node.Node {
return n.geth
}
// MakeNode create a geth node entity
func MakeNode(config *params.NodeConfig) *Node {
// make sure data directory exists
if err := os.MkdirAll(filepath.Join(config.DataDir), os.ModePerm); err != nil {
Fatalf(err)
}
// make sure keys directory exists
if err := os.MkdirAll(filepath.Join(config.KeyStoreDir), os.ModePerm); err != nil {
Fatalf(err)
}
// setup logging
if _, err := params.SetupLogger(config); err != nil {
Fatalf(err)
}
// configure required node (should you need to update node's config, e.g. add bootstrap nodes, see node.Config)
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stackConfig := &node.Config{
DataDir: config.DataDir,
KeyStoreDir: config.KeyStoreDir,
UseLightweightKDF: true,
Name: config.Name,
Version: config.Version,
P2P: p2p.Config{
NoDiscovery: true,
DiscoveryV5: false,
DiscoveryV5Addr: ":0",
BootstrapNodes: makeBootstrapNodes(),
BootstrapNodesV5: makeBootstrapNodesV5(),
ListenAddr: ":0",
NAT: nat.Any(),
MaxPeers: config.MaxPeers,
MaxPendingPeers: config.MaxPendingPeers,
},
IPCPath: makeIPCPath(config),
HTTPHost: config.HTTPHost,
HTTPPort: config.HTTPPort,
HTTPCors: []string{"*"},
HTTPModules: strings.Split(config.APIModules, ","),
WSHost: makeWSHost(config),
WSPort: config.WSPort,
WSOrigins: []string{"*"},
WSModules: strings.Split(config.APIModules, ","),
}
if len(config.NodeKeyFile) > 0 {
log.Info("Loading private key file", "file", config.NodeKeyFile)
pk, err := crypto.LoadECDSA(config.NodeKeyFile)
if err != nil {
log.Warn(fmt.Sprintf("Failed loading private key file '%s': %v", config.NodeKeyFile, err))
}
// override node's private key
stackConfig.P2P.PrivateKey = pk
}
if len(config.NodeKeyFile) > 0 {
log.Info("Loading private key file", "file", config.NodeKeyFile)
pk, err := crypto.LoadECDSA(config.NodeKeyFile)
if err != nil {
log.Info("Failed loading private key file", "file", config.NodeKeyFile, "err", err)
}
// override node's private key
stackConfig.P2P.PrivateKey = pk
}
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stack, err := node.New(stackConfig)
if err != nil {
Fatalf(ErrNodeMakeFailure)
}
// start Ethereum service
if err := activateEthService(stack, config); err != nil {
Fatalf(fmt.Errorf("%v: %v", ErrEthServiceRegistrationFailure, err))
}
// start Whisper service
if err := activateShhService(stack, config); err != nil {
Fatalf(fmt.Errorf("%v: %v", ErrSshServiceRegistrationFailure, err))
}
return &Node{
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geth: stack,
gethConfig: stackConfig,
started: make(chan struct{}),
config: config,
}
}
// activateEthService configures and registers the eth.Ethereum service with a given node.
func activateEthService(stack *node.Node, config *params.NodeConfig) error {
if !config.LightEthConfig.Enabled {
log.Info("LES protocol is disabled")
return nil
}
var genesis *core.Genesis
if config.LightEthConfig.Genesis != "" {
genesis = new(core.Genesis)
if err := json.Unmarshal([]byte(config.LightEthConfig.Genesis), genesis); err != nil {
return fmt.Errorf("invalid genesis spec: %v", err)
}
}
ethConf := eth.DefaultConfig
ethConf.Genesis = genesis
ethConf.SyncMode = downloader.LightSync
ethConf.NetworkId = config.NetworkId
ethConf.DatabaseCache = config.LightEthConfig.DatabaseCache
ethConf.MaxPeers = config.MaxPeers
ethConf.DatabaseHandles = makeDatabaseHandles()
if err := stack.Register(func(ctx *node.ServiceContext) (node.Service, error) {
return les.New(ctx, &ethConf)
}); err != nil {
return fmt.Errorf("%v: %v", ErrLightEthRegistrationFailure, err)
}
return nil
}
// activateShhService configures Whisper and adds it to the given node.
func activateShhService(stack *node.Node, config *params.NodeConfig) error {
if !config.WhisperConfig.Enabled {
log.Info("SHH protocol is disabled")
return nil
}
serviceConstructor := func(*node.ServiceContext) (node.Service, error) {
whisperConfig := config.WhisperConfig
whisperService := whisper.New()
// enable mail service
if whisperConfig.MailServerNode {
password, err := whisperConfig.ReadPasswordFile()
if err != nil {
return nil, err
}
var mailServer mailserver.WMailServer
whisperService.RegisterServer(&mailServer)
mailServer.Init(whisperService, whisperConfig.DataDir, string(password), whisperConfig.MinimumPoW)
}
// enable notification service
if whisperConfig.NotificationServerNode {
var notificationServer notifications.NotificationServer
whisperService.RegisterNotificationServer(&notificationServer)
notificationServer.Init(whisperService, whisperConfig)
}
return whisperService, nil
}
if err := stack.Register(serviceConstructor); err != nil {
return err
}
return nil
}
// makeIPCPath returns IPC-RPC filename
func makeIPCPath(config *params.NodeConfig) string {
if !config.IPCEnabled {
return ""
}
return path.Join(config.DataDir, config.IPCFile)
}
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// makeWSHost returns WS-RPC Server host, given enabled/disabled flag
func makeWSHost(config *params.NodeConfig) string {
if !config.WSEnabled {
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return ""
}
return config.WSHost
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}
// makeDatabaseHandles makes sure that enough file descriptors are available to the process
// (and returns half of them for node's database to use)
func makeDatabaseHandles() int {
// current limit
var limit syscall.Rlimit
if err := syscall.Getrlimit(syscall.RLIMIT_NOFILE, &limit); err != nil {
Fatalf(err)
}
// increase limit
limit.Cur = limit.Max
if limit.Cur > params.DefaultFileDescriptorLimit {
limit.Cur = params.DefaultFileDescriptorLimit
}
if err := syscall.Setrlimit(syscall.RLIMIT_NOFILE, &limit); err != nil {
Fatalf(err)
}
// re-query limit
if err := syscall.Getrlimit(syscall.RLIMIT_NOFILE, &limit); err != nil {
Fatalf(err)
}
// cap limit
if limit.Cur > params.DefaultFileDescriptorLimit {
limit.Cur = params.DefaultFileDescriptorLimit
}
return int(limit.Cur) / 2
}
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// makeBootstrapNodes returns default (hence bootstrap) list of peers
func makeBootstrapNodes() []*discover.Node {
// on desktops params.TestnetBootnodes and params.MainBootnodes,
// on mobile client we deliberately keep this list empty
enodes := []string{}
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var bootstapNodes []*discover.Node
for _, enode := range enodes {
bootstapNodes = append(bootstapNodes, discover.MustParseNode(enode))
}
return bootstapNodes
}
// makeBootstrapNodesV5 returns default (hence bootstrap) list of peers
func makeBootstrapNodesV5() []*discv5.Node {
// on desktops params.DiscoveryV5Bootnodes,
// on mobile client we deliberately keep this list empty
enodes := []string{}
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var bootstapNodes []*discv5.Node
for _, enode := range enodes {
bootstapNodes = append(bootstapNodes, discv5.MustParseNode(enode))
}
return bootstapNodes
}
func Fatalf(reason interface{}, args ...interface{}) {
// decide on output stream
w := io.MultiWriter(os.Stdout, os.Stderr)
outf, _ := os.Stdout.Stat()
errf, _ := os.Stderr.Stat()
if outf != nil && errf != nil && os.SameFile(outf, errf) {
w = os.Stderr
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}
// find out whether error or string has been passed as a reason
r := reflect.ValueOf(reason)
if r.Kind() == reflect.String {
fmt.Fprintf(w, "Fatal Failure: "+reason.(string)+"\n", args)
} else {
fmt.Fprintf(w, "Fatal Failure: %v\n", reason.(error))
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}
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debug.PrintStack()
os.Exit(1)
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}
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// HaltOnPanic recovers from panic, logs issue, sends upward notification, and exits
func HaltOnPanic() {
if r := recover(); r != nil {
err := fmt.Errorf("%v: %v", ErrNodeRunFailure, r)
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// send signal up to native app
SendSignal(SignalEnvelope{
Type: EventNodeCrashed,
Event: NodeCrashEvent{
Error: err.Error(),
},
})
Fatalf(err) // os.exit(1) is called internally
}
}