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// 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 node
import (
crand "crypto/rand"
"errors"
"fmt"
"net/http"
"os"
"path/filepath"
"reflect"
"strings"
"sync"
"github.com/ethereum/go-ethereum/accounts"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/hexutil"
"github.com/ethereum/go-ethereum/core/rawdb"
"github.com/ethereum/go-ethereum/ethdb"
"github.com/ethereum/go-ethereum/event"
"github.com/ethereum/go-ethereum/log"
"github.com/ethereum/go-ethereum/p2p"
"github.com/ethereum/go-ethereum/rpc"
"github.com/prometheus/tsdb/fileutil"
)
// Node is a container on which services can be registered.
type Node struct {
eventmux *event.TypeMux
config *Config
accman *accounts.Manager
log log.Logger
keyDir string // key store directory
keyDirTemp bool // If true, key directory will be removed by Stop
dirLock fileutil.Releaser // prevents concurrent use of instance directory
stop chan struct{} // Channel to wait for termination notifications
server *p2p.Server // Currently running P2P networking layer
startStopLock sync.Mutex // Start/Stop are protected by an additional lock
state int // Tracks state of node lifecycle
lock sync.Mutex
lifecycles []Lifecycle // All registered backends, services, and auxiliary services that have a lifecycle
rpcAPIs []rpc.API // List of APIs currently provided by the node
http *httpServer //
ws *httpServer //
httpAuth *httpServer //
wsAuth *httpServer //
ipc *ipcServer // Stores information about the ipc http server
inprocHandler *rpc.Server // In-process RPC request handler to process the API requests
databases map[*closeTrackingDB]struct{} // All open databases
}
const (
initializingState = iota
runningState
closedState
)
// New creates a new P2P node, ready for protocol registration.
func New(conf *Config) (*Node, error) {
// Copy config and resolve the datadir so future changes to the current
// working directory don't affect the node.
confCopy := *conf
conf = &confCopy
if conf.DataDir != "" {
absdatadir, err := filepath.Abs(conf.DataDir)
if err != nil {
return nil, err
}
conf.DataDir = absdatadir
}
if conf.Logger == nil {
conf.Logger = log.New()
}
// Ensure that the instance name doesn't cause weird conflicts with
// other files in the data directory.
if strings.ContainsAny(conf.Name, `/\`) {
return nil, errors.New(`Config.Name must not contain '/' or '\'`)
}
if conf.Name == datadirDefaultKeyStore {
return nil, errors.New(`Config.Name cannot be "` + datadirDefaultKeyStore + `"`)
}
if strings.HasSuffix(conf.Name, ".ipc") {
return nil, errors.New(`Config.Name cannot end in ".ipc"`)
}
node := &Node{
config: conf,
inprocHandler: rpc.NewServer(),
eventmux: new(event.TypeMux),
log: conf.Logger,
stop: make(chan struct{}),
server: &p2p.Server{Config: conf.P2P},
databases: make(map[*closeTrackingDB]struct{}),
}
// Register built-in APIs.
node.rpcAPIs = append(node.rpcAPIs, node.apis()...)
// Acquire the instance directory lock.
if err := node.openDataDir(); err != nil {
return nil, err
}
keyDir, isEphem, err := getKeyStoreDir(conf)
if err != nil {
return nil, err
}
node.keyDir = keyDir
node.keyDirTemp = isEphem
// Creates an empty AccountManager with no backends. Callers (e.g. cmd/geth)
// are required to add the backends later on.
node.accman = accounts.NewManager(&accounts.Config{InsecureUnlockAllowed: conf.InsecureUnlockAllowed})
// Initialize the p2p server. This creates the node key and discovery databases.
node.server.Config.PrivateKey = node.config.NodeKey()
node.server.Config.Name = node.config.NodeName()
node.server.Config.Logger = node.log
if node.server.Config.StaticNodes == nil {
node.server.Config.StaticNodes = node.config.StaticNodes()
}
if node.server.Config.TrustedNodes == nil {
node.server.Config.TrustedNodes = node.config.TrustedNodes()
}
if node.server.Config.NodeDatabase == "" {
node.server.Config.NodeDatabase = node.config.NodeDB()
}
// Check HTTP/WS prefixes are valid.
if err := validatePrefix("HTTP", conf.HTTPPathPrefix); err != nil {
return nil, err
}
if err := validatePrefix("WebSocket", conf.WSPathPrefix); err != nil {
return nil, err
}
// Configure RPC servers.
node.http = newHTTPServer(node.log, conf.HTTPTimeouts)
node.httpAuth = newHTTPServer(node.log, conf.HTTPTimeouts)
node.ws = newHTTPServer(node.log, rpc.DefaultHTTPTimeouts)
node.wsAuth = newHTTPServer(node.log, rpc.DefaultHTTPTimeouts)
node.ipc = newIPCServer(node.log, conf.IPCEndpoint())
return node, nil
}
// Start starts all registered lifecycles, RPC services and p2p networking.
// Node can only be started once.
func (n *Node) Start() error {
n.startStopLock.Lock()
defer n.startStopLock.Unlock()
n.lock.Lock()
switch n.state {
case runningState:
n.lock.Unlock()
return ErrNodeRunning
case closedState:
n.lock.Unlock()
return ErrNodeStopped
}
n.state = runningState
// open networking and RPC endpoints
err := n.openEndpoints()
lifecycles := make([]Lifecycle, len(n.lifecycles))
copy(lifecycles, n.lifecycles)
n.lock.Unlock()
// Check if endpoint startup failed.
if err != nil {
n.doClose(nil)
return err
}
// Start all registered lifecycles.
var started []Lifecycle
for _, lifecycle := range lifecycles {
if err = lifecycle.Start(); err != nil {
break
}
started = append(started, lifecycle)
}
// Check if any lifecycle failed to start.
if err != nil {
n.stopServices(started)
n.doClose(nil)
}
return err
}
// Close stops the Node and releases resources acquired in
// Node constructor New.
func (n *Node) Close() error {
n.startStopLock.Lock()
defer n.startStopLock.Unlock()
n.lock.Lock()
state := n.state
n.lock.Unlock()
switch state {
case initializingState:
// The node was never started.
return n.doClose(nil)
case runningState:
// The node was started, release resources acquired by Start().
var errs []error
if err := n.stopServices(n.lifecycles); err != nil {
errs = append(errs, err)
}
return n.doClose(errs)
case closedState:
return ErrNodeStopped
default:
panic(fmt.Sprintf("node is in unknown state %d", state))
}
}
// doClose releases resources acquired by New(), collecting errors.
func (n *Node) doClose(errs []error) error {
// Close databases. This needs the lock because it needs to
// synchronize with OpenDatabase*.
n.lock.Lock()
n.state = closedState
errs = append(errs, n.closeDatabases()...)
n.lock.Unlock()
if err := n.accman.Close(); err != nil {
errs = append(errs, err)
}
if n.keyDirTemp {
if err := os.RemoveAll(n.keyDir); err != nil {
errs = append(errs, err)
}
}
// Release instance directory lock.
n.closeDataDir()
// Unblock n.Wait.
close(n.stop)
// Report any errors that might have occurred.
switch len(errs) {
case 0:
return nil
case 1:
return errs[0]
default:
return fmt.Errorf("%v", errs)
}
}
// openEndpoints starts all network and RPC endpoints.
func (n *Node) openEndpoints() error {
// start networking endpoints
n.log.Info("Starting peer-to-peer node", "instance", n.server.Name)
if err := n.server.Start(); err != nil {
return convertFileLockError(err)
}
// start RPC endpoints
err := n.startRPC()
if err != nil {
n.stopRPC()
n.server.Stop()
}
return err
}
// containsLifecycle checks if 'lfs' contains 'l'.
func containsLifecycle(lfs []Lifecycle, l Lifecycle) bool {
for _, obj := range lfs {
if obj == l {
return true
}
}
return false
}
// stopServices terminates running services, RPC and p2p networking.
// It is the inverse of Start.
func (n *Node) stopServices(running []Lifecycle) error {
n.stopRPC()
// Stop running lifecycles in reverse order.
failure := &StopError{Services: make(map[reflect.Type]error)}
for i := len(running) - 1; i >= 0; i-- {
if err := running[i].Stop(); err != nil {
failure.Services[reflect.TypeOf(running[i])] = err
}
}
// Stop p2p networking.
n.server.Stop()
if len(failure.Services) > 0 {
return failure
}
return nil
}
func (n *Node) openDataDir() error {
if n.config.DataDir == "" {
return nil // ephemeral
}
instdir := filepath.Join(n.config.DataDir, n.config.name())
if err := os.MkdirAll(instdir, 0700); err != nil {
return err
}
// Lock the instance directory to prevent concurrent use by another instance as well as
// accidental use of the instance directory as a database.
release, _, err := fileutil.Flock(filepath.Join(instdir, "LOCK"))
if err != nil {
return convertFileLockError(err)
}
n.dirLock = release
return nil
}
func (n *Node) closeDataDir() {
// Release instance directory lock.
if n.dirLock != nil {
if err := n.dirLock.Release(); err != nil {
n.log.Error("Can't release datadir lock", "err", err)
}
n.dirLock = nil
}
}
// obtainJWTSecret loads the jwt-secret, either from the provided config,
// or from the default location. If neither of those are present, it generates
// a new secret and stores to the default location.
func (n *Node) obtainJWTSecret(cliParam string) ([]byte, error) {
fileName := cliParam
if len(fileName) == 0 {
// no path provided, use default
fileName = n.ResolvePath(datadirJWTKey)
}
// try reading from file
log.Debug("Reading JWT secret", "path", fileName)
if data, err := os.ReadFile(fileName); err == nil {
jwtSecret := common.FromHex(strings.TrimSpace(string(data)))
if len(jwtSecret) == 32 {
return jwtSecret, nil
}
log.Error("Invalid JWT secret", "path", fileName, "length", len(jwtSecret))
return nil, errors.New("invalid JWT secret")
}
// Need to generate one
jwtSecret := make([]byte, 32)
crand.Read(jwtSecret)
// if we're in --dev mode, don't bother saving, just show it
if fileName == "" {
log.Info("Generated ephemeral JWT secret", "secret", hexutil.Encode(jwtSecret))
return jwtSecret, nil
}
if err := os.WriteFile(fileName, []byte(hexutil.Encode(jwtSecret)), 0600); err != nil {
return nil, err
}
log.Info("Generated JWT secret", "path", fileName)
return jwtSecret, nil
}
// startRPC is a helper method to configure all the various RPC endpoints during node
// startup. It's not meant to be called at any time afterwards as it makes certain
// assumptions about the state of the node.
func (n *Node) startRPC() error {
if err := n.startInProc(); err != nil {
return err
}
// Configure IPC.
if n.ipc.endpoint != "" {
if err := n.ipc.start(n.rpcAPIs); err != nil {
return err
}
}
var (
servers []*httpServer
open, all = n.GetAPIs()
)
initHttp := func(server *httpServer, apis []rpc.API, port int) error {
if err := server.setListenAddr(n.config.HTTPHost, port); err != nil {
return err
}
if err := server.enableRPC(apis, httpConfig{
CorsAllowedOrigins: n.config.HTTPCors,
Vhosts: n.config.HTTPVirtualHosts,
Modules: n.config.HTTPModules,
prefix: n.config.HTTPPathPrefix,
}); err != nil {
return err
}
servers = append(servers, server)
return nil
}
initWS := func(apis []rpc.API, port int) error {
server := n.wsServerForPort(port, false)
if err := server.setListenAddr(n.config.WSHost, port); err != nil {
return err
}
if err := server.enableWS(n.rpcAPIs, wsConfig{
Modules: n.config.WSModules,
Origins: n.config.WSOrigins,
prefix: n.config.WSPathPrefix,
}); err != nil {
return err
}
servers = append(servers, server)
return nil
}
initAuth := func(apis []rpc.API, port int, secret []byte) error {
// Enable auth via HTTP
server := n.httpAuth
if err := server.setListenAddr(n.config.AuthAddr, port); err != nil {
return err
}
if err := server.enableRPC(apis, httpConfig{
CorsAllowedOrigins: DefaultAuthCors,
Vhosts: n.config.AuthVirtualHosts,
Modules: DefaultAuthModules,
prefix: DefaultAuthPrefix,
jwtSecret: secret,
}); err != nil {
return err
}
servers = append(servers, server)
// Enable auth via WS
server = n.wsServerForPort(port, true)
if err := server.setListenAddr(n.config.AuthAddr, port); err != nil {
return err
}
if err := server.enableWS(apis, wsConfig{
Modules: DefaultAuthModules,
Origins: DefaultAuthOrigins,
prefix: DefaultAuthPrefix,
jwtSecret: secret,
}); err != nil {
return err
}
servers = append(servers, server)
return nil
}
// Set up HTTP.
if n.config.HTTPHost != "" {
// Configure legacy unauthenticated HTTP.
if err := initHttp(n.http, open, n.config.HTTPPort); err != nil {
return err
}
}
// Configure WebSocket.
if n.config.WSHost != "" {
// legacy unauthenticated
if err := initWS(open, n.config.WSPort); err != nil {
return err
}
}
// Configure authenticated API
if len(open) != len(all) {
jwtSecret, err := n.obtainJWTSecret(n.config.JWTSecret)
if err != nil {
return err
}
if err := initAuth(all, n.config.AuthPort, jwtSecret); err != nil {
return err
}
}
// Start the servers
for _, server := range servers {
if err := server.start(); err != nil {
return err
}
}
return nil
}
func (n *Node) wsServerForPort(port int, authenticated bool) *httpServer {
httpServer, wsServer := n.http, n.ws
if authenticated {
httpServer, wsServer = n.httpAuth, n.wsAuth
}
if n.config.HTTPHost == "" || httpServer.port == port {
return httpServer
}
return wsServer
}
func (n *Node) stopRPC() {
n.http.stop()
n.ws.stop()
n.httpAuth.stop()
n.wsAuth.stop()
n.ipc.stop()
n.stopInProc()
}
// startInProc registers all RPC APIs on the inproc server.
func (n *Node) startInProc() error {
for _, api := range n.rpcAPIs {
if err := n.inprocHandler.RegisterName(api.Namespace, api.Service); err != nil {
return err
}
}
return nil
}
// stopInProc terminates the in-process RPC endpoint.
func (n *Node) stopInProc() {
n.inprocHandler.Stop()
}
// Wait blocks until the node is closed.
func (n *Node) Wait() {
<-n.stop
}
// RegisterLifecycle registers the given Lifecycle on the node.
func (n *Node) RegisterLifecycle(lifecycle Lifecycle) {
n.lock.Lock()
defer n.lock.Unlock()
if n.state != initializingState {
panic("can't register lifecycle on running/stopped node")
}
if containsLifecycle(n.lifecycles, lifecycle) {
panic(fmt.Sprintf("attempt to register lifecycle %T more than once", lifecycle))
}
n.lifecycles = append(n.lifecycles, lifecycle)
}
// RegisterProtocols adds backend's protocols to the node's p2p server.
func (n *Node) RegisterProtocols(protocols []p2p.Protocol) {
n.lock.Lock()
defer n.lock.Unlock()
if n.state != initializingState {
panic("can't register protocols on running/stopped node")
}
n.server.Protocols = append(n.server.Protocols, protocols...)
}
// RegisterAPIs registers the APIs a service provides on the node.
func (n *Node) RegisterAPIs(apis []rpc.API) {
n.lock.Lock()
defer n.lock.Unlock()
if n.state != initializingState {
panic("can't register APIs on running/stopped node")
}
n.rpcAPIs = append(n.rpcAPIs, apis...)
}
// GetAPIs return two sets of APIs, both the ones that do not require
// authentication, and the complete set
func (n *Node) GetAPIs() (unauthenticated, all []rpc.API) {
for _, api := range n.rpcAPIs {
if !api.Authenticated {
unauthenticated = append(unauthenticated, api)
}
}
return unauthenticated, n.rpcAPIs
}
// RegisterHandler mounts a handler on the given path on the canonical HTTP server.
//
// The name of the handler is shown in a log message when the HTTP server starts
// and should be a descriptive term for the service provided by the handler.
func (n *Node) RegisterHandler(name, path string, handler http.Handler) {
n.lock.Lock()
defer n.lock.Unlock()
if n.state != initializingState {
panic("can't register HTTP handler on running/stopped node")
}
n.http.mux.Handle(path, handler)
n.http.handlerNames[path] = name
}
// Attach creates an RPC client attached to an in-process API handler.
func (n *Node) Attach() (*rpc.Client, error) {
return rpc.DialInProc(n.inprocHandler), nil
}
// RPCHandler returns the in-process RPC request handler.
func (n *Node) RPCHandler() (*rpc.Server, error) {
n.lock.Lock()
defer n.lock.Unlock()
if n.state == closedState {
return nil, ErrNodeStopped
}
return n.inprocHandler, nil
}
// Config returns the configuration of node.
func (n *Node) Config() *Config {
return n.config
}
// Server retrieves the currently running P2P network layer. This method is meant
// only to inspect fields of the currently running server. Callers should not
// start or stop the returned server.
func (n *Node) Server() *p2p.Server {
n.lock.Lock()
defer n.lock.Unlock()
return n.server
}
// DataDir retrieves the current datadir used by the protocol stack.
// Deprecated: No files should be stored in this directory, use InstanceDir instead.
func (n *Node) DataDir() string {
return n.config.DataDir
}
// InstanceDir retrieves the instance directory used by the protocol stack.
func (n *Node) InstanceDir() string {
return n.config.instanceDir()
}
// KeyStoreDir retrieves the key directory
func (n *Node) KeyStoreDir() string {
return n.keyDir
}
// AccountManager retrieves the account manager used by the protocol stack.
func (n *Node) AccountManager() *accounts.Manager {
return n.accman
}
// IPCEndpoint retrieves the current IPC endpoint used by the protocol stack.
func (n *Node) IPCEndpoint() string {
return n.ipc.endpoint
}
// HTTPEndpoint returns the URL of the HTTP server. Note that this URL does not
// contain the JSON-RPC path prefix set by HTTPPathPrefix.
func (n *Node) HTTPEndpoint() string {
return "http://" + n.http.listenAddr()
}
// WSEndpoint returns the current JSON-RPC over WebSocket endpoint.
func (n *Node) WSEndpoint() string {
if n.http.wsAllowed() {
return "ws://" + n.http.listenAddr() + n.http.wsConfig.prefix
}
return "ws://" + n.ws.listenAddr() + n.ws.wsConfig.prefix
}
// EventMux retrieves the event multiplexer used by all the network services in
// the current protocol stack.
func (n *Node) EventMux() *event.TypeMux {
return n.eventmux
}
// OpenDatabase opens an existing database with the given name (or creates one if no
// previous can be found) from within the node's instance directory. If the node is
// ephemeral, a memory database is returned.
func (n *Node) OpenDatabase(name string, cache, handles int, namespace string, readonly bool) (ethdb.Database, error) {
n.lock.Lock()
defer n.lock.Unlock()
if n.state == closedState {
return nil, ErrNodeStopped
}
var db ethdb.Database
var err error
if n.config.DataDir == "" {
db = rawdb.NewMemoryDatabase()
} else {
db, err = rawdb.NewLevelDBDatabase(n.ResolvePath(name), cache, handles, namespace, readonly)
}
if err == nil {
db = n.wrapDatabase(db)
}
return db, err
}
// OpenDatabaseWithFreezer opens an existing database with the given name (or
// creates one if no previous can be found) from within the node's data directory,
// also attaching a chain freezer to it that moves ancient chain data from the
// database to immutable append-only files. If the node is an ephemeral one, a
// memory database is returned.
func (n *Node) OpenDatabaseWithFreezer(name string, cache, handles int, freezer, namespace string, readonly bool) (ethdb.Database, error) {
n.lock.Lock()
defer n.lock.Unlock()
if n.state == closedState {
return nil, ErrNodeStopped
}
var db ethdb.Database
var err error
if n.config.DataDir == "" {
db = rawdb.NewMemoryDatabase()
} else {
root := n.ResolvePath(name)
switch {
case freezer == "":
freezer = filepath.Join(root, "ancient")
case !filepath.IsAbs(freezer):
freezer = n.ResolvePath(freezer)
}
db, err = rawdb.NewLevelDBDatabaseWithFreezer(root, cache, handles, freezer, namespace, readonly)
}
if err == nil {
db = n.wrapDatabase(db)
}
return db, err
}
// ResolvePath returns the absolute path of a resource in the instance directory.
func (n *Node) ResolvePath(x string) string {
return n.config.ResolvePath(x)
}
// closeTrackingDB wraps the Close method of a database. When the database is closed by the
// service, the wrapper removes it from the node's database map. This ensures that Node
// won't auto-close the database if it is closed by the service that opened it.
type closeTrackingDB struct {
ethdb.Database
n *Node
}
func (db *closeTrackingDB) Close() error {
db.n.lock.Lock()
delete(db.n.databases, db)
db.n.lock.Unlock()
return db.Database.Close()
}
// wrapDatabase ensures the database will be auto-closed when Node is closed.
func (n *Node) wrapDatabase(db ethdb.Database) ethdb.Database {
wrapper := &closeTrackingDB{db, n}
n.databases[wrapper] = struct{}{}
return wrapper
}
// closeDatabases closes all open databases.
func (n *Node) closeDatabases() (errors []error) {
for db := range n.databases {
delete(n.databases, db)
if err := db.Database.Close(); err != nil {
errors = append(errors, err)
}
}
return errors
}