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inproc.go
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inproc.go
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// Copyright 2017 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 adapters
import (
"context"
"errors"
"fmt"
"math"
"net"
"sync"
"github.com/gorilla/websocket"
"github.com/ponzinomics/go-ethereum/event"
"github.com/ponzinomics/go-ethereum/log"
"github.com/ponzinomics/go-ethereum/node"
"github.com/ponzinomics/go-ethereum/p2p"
"github.com/ponzinomics/go-ethereum/p2p/enode"
"github.com/ponzinomics/go-ethereum/p2p/simulations/pipes"
"github.com/ponzinomics/go-ethereum/rpc"
)
// SimAdapter is a NodeAdapter which creates in-memory simulation nodes and
// connects them using net.Pipe
type SimAdapter struct {
pipe func() (net.Conn, net.Conn, error)
mtx sync.RWMutex
nodes map[enode.ID]*SimNode
lifecycles LifecycleConstructors
}
// NewSimAdapter creates a SimAdapter which is capable of running in-memory
// simulation nodes running any of the given services (the services to run on a
// particular node are passed to the NewNode function in the NodeConfig)
// the adapter uses a net.Pipe for in-memory simulated network connections
func NewSimAdapter(services LifecycleConstructors) *SimAdapter {
return &SimAdapter{
pipe: pipes.NetPipe,
nodes: make(map[enode.ID]*SimNode),
lifecycles: services,
}
}
// Name returns the name of the adapter for logging purposes
func (s *SimAdapter) Name() string {
return "sim-adapter"
}
// NewNode returns a new SimNode using the given config
func (s *SimAdapter) NewNode(config *NodeConfig) (Node, error) {
s.mtx.Lock()
defer s.mtx.Unlock()
id := config.ID
// verify that the node has a private key in the config
if config.PrivateKey == nil {
return nil, fmt.Errorf("node is missing private key: %s", id)
}
// check a node with the ID doesn't already exist
if _, exists := s.nodes[id]; exists {
return nil, fmt.Errorf("node already exists: %s", id)
}
// check the services are valid
if len(config.Lifecycles) == 0 {
return nil, errors.New("node must have at least one service")
}
for _, service := range config.Lifecycles {
if _, exists := s.lifecycles[service]; !exists {
return nil, fmt.Errorf("unknown node service %q", service)
}
}
err := config.initDummyEnode()
if err != nil {
return nil, err
}
n, err := node.New(&node.Config{
P2P: p2p.Config{
PrivateKey: config.PrivateKey,
MaxPeers: math.MaxInt32,
NoDiscovery: true,
Dialer: s,
EnableMsgEvents: config.EnableMsgEvents,
},
ExternalSigner: config.ExternalSigner,
Logger: log.New("node.id", id.String()),
})
if err != nil {
return nil, err
}
simNode := &SimNode{
ID: id,
config: config,
node: n,
adapter: s,
running: make(map[string]node.Lifecycle),
}
s.nodes[id] = simNode
return simNode, nil
}
// Dial implements the p2p.NodeDialer interface by connecting to the node using
// an in-memory net.Pipe
func (s *SimAdapter) Dial(ctx context.Context, dest *enode.Node) (conn net.Conn, err error) {
node, ok := s.GetNode(dest.ID())
if !ok {
return nil, fmt.Errorf("unknown node: %s", dest.ID())
}
srv := node.Server()
if srv == nil {
return nil, fmt.Errorf("node not running: %s", dest.ID())
}
// SimAdapter.pipe is net.Pipe (NewSimAdapter)
pipe1, pipe2, err := s.pipe()
if err != nil {
return nil, err
}
// this is simulated 'listening'
// asynchronously call the dialed destination node's p2p server
// to set up connection on the 'listening' side
go srv.SetupConn(pipe1, 0, nil)
return pipe2, nil
}
// DialRPC implements the RPCDialer interface by creating an in-memory RPC
// client of the given node
func (s *SimAdapter) DialRPC(id enode.ID) (*rpc.Client, error) {
node, ok := s.GetNode(id)
if !ok {
return nil, fmt.Errorf("unknown node: %s", id)
}
return node.node.Attach()
}
// GetNode returns the node with the given ID if it exists
func (s *SimAdapter) GetNode(id enode.ID) (*SimNode, bool) {
s.mtx.RLock()
defer s.mtx.RUnlock()
node, ok := s.nodes[id]
return node, ok
}
// SimNode is an in-memory simulation node which connects to other nodes using
// net.Pipe (see SimAdapter.Dial), running devp2p protocols directly over that
// pipe
type SimNode struct {
lock sync.RWMutex
ID enode.ID
config *NodeConfig
adapter *SimAdapter
node *node.Node
running map[string]node.Lifecycle
client *rpc.Client
registerOnce sync.Once
}
// Close closes the underlaying node.Node to release
// acquired resources.
func (sn *SimNode) Close() error {
return sn.node.Close()
}
// Addr returns the node's discovery address
func (sn *SimNode) Addr() []byte {
return []byte(sn.Node().String())
}
// Node returns a node descriptor representing the SimNode
func (sn *SimNode) Node() *enode.Node {
return sn.config.Node()
}
// Client returns an rpc.Client which can be used to communicate with the
// underlying services (it is set once the node has started)
func (sn *SimNode) Client() (*rpc.Client, error) {
sn.lock.RLock()
defer sn.lock.RUnlock()
if sn.client == nil {
return nil, errors.New("node not started")
}
return sn.client, nil
}
// ServeRPC serves RPC requests over the given connection by creating an
// in-memory client to the node's RPC server.
func (sn *SimNode) ServeRPC(conn *websocket.Conn) error {
handler, err := sn.node.RPCHandler()
if err != nil {
return err
}
codec := rpc.NewFuncCodec(conn, func(v any, _ bool) error { return conn.WriteJSON(v) }, conn.ReadJSON)
handler.ServeCodec(codec, 0)
return nil
}
// Snapshots creates snapshots of the services by calling the
// simulation_snapshot RPC method
func (sn *SimNode) Snapshots() (map[string][]byte, error) {
sn.lock.RLock()
services := make(map[string]node.Lifecycle, len(sn.running))
for name, service := range sn.running {
services[name] = service
}
sn.lock.RUnlock()
if len(services) == 0 {
return nil, errors.New("no running services")
}
snapshots := make(map[string][]byte)
for name, service := range services {
if s, ok := service.(interface {
Snapshot() ([]byte, error)
}); ok {
snap, err := s.Snapshot()
if err != nil {
return nil, err
}
snapshots[name] = snap
}
}
return snapshots, nil
}
// Start registers the services and starts the underlying devp2p node
func (sn *SimNode) Start(snapshots map[string][]byte) error {
// ensure we only register the services once in the case of the node
// being stopped and then started again
var regErr error
sn.registerOnce.Do(func() {
for _, name := range sn.config.Lifecycles {
ctx := &ServiceContext{
RPCDialer: sn.adapter,
Config: sn.config,
}
if snapshots != nil {
ctx.Snapshot = snapshots[name]
}
serviceFunc := sn.adapter.lifecycles[name]
service, err := serviceFunc(ctx, sn.node)
if err != nil {
regErr = err
break
}
// if the service has already been registered, don't register it again.
if _, ok := sn.running[name]; ok {
continue
}
sn.running[name] = service
}
})
if regErr != nil {
return regErr
}
if err := sn.node.Start(); err != nil {
return err
}
// create an in-process RPC client
client, err := sn.node.Attach()
if err != nil {
return err
}
sn.lock.Lock()
sn.client = client
sn.lock.Unlock()
return nil
}
// Stop closes the RPC client and stops the underlying devp2p node
func (sn *SimNode) Stop() error {
sn.lock.Lock()
if sn.client != nil {
sn.client.Close()
sn.client = nil
}
sn.lock.Unlock()
return sn.node.Close()
}
// Service returns a running service by name
func (sn *SimNode) Service(name string) node.Lifecycle {
sn.lock.RLock()
defer sn.lock.RUnlock()
return sn.running[name]
}
// Services returns a copy of the underlying services
func (sn *SimNode) Services() []node.Lifecycle {
sn.lock.RLock()
defer sn.lock.RUnlock()
services := make([]node.Lifecycle, 0, len(sn.running))
for _, service := range sn.running {
services = append(services, service)
}
return services
}
// ServiceMap returns a map by names of the underlying services
func (sn *SimNode) ServiceMap() map[string]node.Lifecycle {
sn.lock.RLock()
defer sn.lock.RUnlock()
services := make(map[string]node.Lifecycle, len(sn.running))
for name, service := range sn.running {
services[name] = service
}
return services
}
// Server returns the underlying p2p.Server
func (sn *SimNode) Server() *p2p.Server {
return sn.node.Server()
}
// SubscribeEvents subscribes the given channel to peer events from the
// underlying p2p.Server
func (sn *SimNode) SubscribeEvents(ch chan *p2p.PeerEvent) event.Subscription {
srv := sn.Server()
if srv == nil {
panic("node not running")
}
return srv.SubscribeEvents(ch)
}
// NodeInfo returns information about the node
func (sn *SimNode) NodeInfo() *p2p.NodeInfo {
server := sn.Server()
if server == nil {
return &p2p.NodeInfo{
ID: sn.ID.String(),
Enode: sn.Node().String(),
}
}
return server.NodeInfo()
}