mirror of
https://github.com/ethereum/go-ethereum.git
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323 lines
8.1 KiB
Go
323 lines
8.1 KiB
Go
// Copyright 2016 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package adapters
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import (
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"errors"
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"fmt"
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"math"
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"net"
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"reflect"
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"sync"
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"github.com/ethereum/go-ethereum/event"
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"github.com/ethereum/go-ethereum/log"
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"github.com/ethereum/go-ethereum/node"
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"github.com/ethereum/go-ethereum/p2p"
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"github.com/ethereum/go-ethereum/p2p/discover"
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"github.com/ethereum/go-ethereum/rpc"
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)
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// SimAdapter is a NodeAdapter which creates in-memory nodes and connects them
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// using an in-memory p2p.MsgReadWriter pipe
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type SimAdapter struct {
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mtx sync.RWMutex
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nodes map[discover.NodeID]*SimNode
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}
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// NewSimAdapter creates a SimAdapter which is capable of running in-memory
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// nodes running any of the given services (the service to run on a particular
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// node is passed to the NewNode function in the NodeConfig)
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func NewSimAdapter(services map[string]ServiceFunc) *SimAdapter {
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return &SimAdapter{
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nodes: make(map[discover.NodeID]*SimNode),
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}
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}
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// Name returns the name of the adapter for logging purpoeses
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func (s *SimAdapter) Name() string {
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return "sim-adapter"
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}
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// NewNode returns a new SimNode using the given config
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func (s *SimAdapter) NewNode(config *NodeConfig) (Node, error) {
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var nodeprotos []p2p.Protocol
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s.mtx.Lock()
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defer s.mtx.Unlock()
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// check a node with the ID doesn't already exist
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id := config.Id
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if _, exists := s.nodes[id.NodeID]; exists {
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return nil, fmt.Errorf("node already exists: %s", id)
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}
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// check the service is valid and initialize it
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/*
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serviceFunc, exists := s.services[config.Service]
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if !exists {
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return nil, fmt.Errorf("unknown node service %q", config.Service)
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}
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node := &SimNode{
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Id: id,
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config: config,
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adapter: s,
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serviceFunc: serviceFunc,
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*/
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//serviceFunc, exists := s.services[config.Service]
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//if !exists {
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// return nil, fmt.Errorf("unknown node service %q", config.Service)
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//}
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//service := serviceFunc(id)
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_, err := node.New(&node.Config{
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P2P: p2p.Config{
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PrivateKey: config.PrivateKey,
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MaxPeers: math.MaxInt32,
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NoDiscovery: true,
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Protocols: nodeprotos,
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Dialer: s,
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EnableMsgEvents: true,
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},
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})
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if err != nil {
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return nil, err
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}
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for _, service := range serviceFuncs[config.Service](id, nil) {
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for _, proto := range service.Protocols() {
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nodeprotos = append(nodeprotos, proto)
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}
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}
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simnode := &SimNode{
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Id: id,
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serviceFunc: serviceFuncs[config.Service],
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adapter: s,
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config: config,
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running: []node.Service{},
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}
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s.nodes[id.NodeID] = simnode
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return simnode, nil
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}
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func (s *SimAdapter) Dial(dest *discover.Node) (conn net.Conn, err error) {
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node, ok := s.GetNode(dest.ID)
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if !ok {
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return nil, fmt.Errorf("unknown node: %s", dest.ID)
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}
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srv := node.Server()
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if srv == nil {
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return nil, fmt.Errorf("node not running: %s", dest.ID)
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}
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pipe1, pipe2 := net.Pipe()
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go srv.SetupConn(pipe1, 0, nil)
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return pipe2, nil
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}
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// GetNode returns the node with the given ID if it exists
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func (s *SimAdapter) GetNode(id discover.NodeID) (*SimNode, bool) {
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s.mtx.RLock()
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defer s.mtx.RUnlock()
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node, ok := s.nodes[id]
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return node, ok
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}
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// SimNode is an in-memory node which connects to other SimNodes using an
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// in-memory p2p.MsgReadWriter pipe, running an underlying service protocol
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// directly over that pipe.
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//
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// It implements the p2p.Server interface so it can be used transparently
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// by the underlying service.
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type SimNode struct {
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lock sync.RWMutex
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Id *NodeId
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config *NodeConfig
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adapter *SimAdapter
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serviceFunc ServiceFunc
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node *node.Node
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client *rpc.Client
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rpcMux *rpcMux
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running []node.Service
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}
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// Addr returns the node's discovery address
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func (self *SimNode) Addr() []byte {
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return []byte(self.Node().String())
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}
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// Node returns a discover.Node representing the SimNode
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func (self *SimNode) Node() *discover.Node {
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return discover.NewNode(self.Id.NodeID, net.IP{127, 0, 0, 1}, 30303, 30303)
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}
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// Client returns an rpc.Client which can be used to communicate with the
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// underlying service (it is set once the node has started)
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func (self *SimNode) Client() (*rpc.Client, error) {
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self.lock.Lock()
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defer self.lock.Unlock()
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if self.client == nil {
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return nil, errors.New("RPC not started")
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}
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return self.client, nil
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}
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// ServeRPC serves RPC requests over the given connection using the node's
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// RPC multiplexer
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func (self *SimNode) ServeRPC(conn net.Conn) error {
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self.lock.Lock()
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mux := self.rpcMux
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self.lock.Unlock()
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if mux == nil {
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return errors.New("RPC not started")
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}
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mux.Serve(conn)
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return nil
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}
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// Snapshot creates a snapshot of the service state by calling the
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// simulation_snapshot RPC method
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func (self *SimNode) Snapshot() ([]byte, error) {
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self.lock.Lock()
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defer self.lock.Unlock()
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if self.client == nil {
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return nil, errors.New("RPC not started")
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}
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var snapshot []byte
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return snapshot, self.client.Call(&snapshot, "simulation_snapshot")
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}
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// Start starts the RPC handler and the underlying service
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func (self *SimNode) Start(snapshot []byte) error {
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self.lock.Lock()
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defer self.lock.Unlock()
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if self.node != nil {
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return errors.New("node already started")
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}
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services := []node.ServiceConstructor{}
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sf := self.serviceFunc(self.Id, snapshot)
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for i, _ := range sf {
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service := sf[i]
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sc := func(ctx *node.ServiceContext) (node.Service, error) {
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return service, nil
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}
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log.Debug(fmt.Sprintf("servicefunc yield: %v %p %p", reflect.TypeOf(sf[i]), sf[i], sc))
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services = append(services, sc)
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self.running = append(self.running, sf[i])
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}
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node, err := node.New(&node.Config{
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P2P: p2p.Config{
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PrivateKey: self.config.PrivateKey,
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MaxPeers: math.MaxInt32,
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NoDiscovery: true,
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Dialer: self.adapter,
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EnableMsgEvents: false,
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},
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NoUSB: true,
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})
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if err != nil {
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return err
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}
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for _, service := range services {
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log.Debug(fmt.Sprintf("service %v", service))
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if err := node.Register(service); err != nil {
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return err
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}
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}
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if err := node.Start(); err != nil {
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return err
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}
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handler, err := node.RPCHandler()
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if err != nil {
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return err
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}
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// create an in-process RPC multiplexer
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pipe1, pipe2 := net.Pipe()
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go handler.ServeCodec(rpc.NewJSONCodec(pipe1), rpc.OptionMethodInvocation|rpc.OptionSubscriptions)
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self.rpcMux = newRPCMux(pipe2)
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// create an in-process RPC client
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self.client = self.rpcMux.Client()
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self.node = node
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return nil
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}
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func (self *SimNode) Stop() error {
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self.lock.Lock()
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defer self.lock.Unlock()
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if self.node == nil {
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return nil
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}
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if err := self.node.Stop(); err != nil {
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return err
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}
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self.node = nil
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return nil
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}
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// Service returns the underlying running node.Service matching the supplied servuce type
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func (self *SimNode) Service(servicetype interface{}) node.Service {
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self.lock.Lock()
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defer self.lock.Unlock()
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typ := reflect.TypeOf(servicetype)
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for _, service := range self.running {
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if reflect.TypeOf(service) == typ {
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return service
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}
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}
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return nil
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}
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func (self *SimNode) Server() *p2p.Server {
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self.lock.Lock()
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defer self.lock.Unlock()
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if self.node == nil {
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return nil
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}
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return self.node.Server()
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}
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func (self *SimNode) SubscribeEvents(ch chan *p2p.PeerEvent) event.Subscription {
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srv := self.Server()
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if srv == nil {
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panic("node not running")
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}
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return srv.SubscribeEvents(ch)
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}
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func (self *SimNode) NodeInfo() *p2p.NodeInfo {
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server := self.Server()
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if server == nil {
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return &p2p.NodeInfo{
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ID: self.Id.String(),
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Enode: self.Node().String(),
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}
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}
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return server.NodeInfo()
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}
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