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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 comms
import (
"fmt"
"math/rand"
"net"
"os"
"encoding/json"
"github.com/ethereum/go-ethereum/logger"
"github.com/ethereum/go-ethereum/logger/glog"
"github.com/ethereum/go-ethereum/rpc/codec"
"github.com/ethereum/go-ethereum/rpc/shared"
)
type Stopper interface {
Stop()
}
type InitFunc func(conn net.Conn) (Stopper, shared.EthereumApi, error)
type IpcConfig struct {
Endpoint string
}
type ipcClient struct {
endpoint string
c net.Conn
codec codec.Codec
coder codec.ApiCoder
}
func (self *ipcClient) Close() {
self.coder.Close()
}
func (self *ipcClient) Send(msg interface{}) error {
var err error
if err = self.coder.WriteResponse(msg); err != nil {
if err = self.reconnect(); err == nil {
err = self.coder.WriteResponse(msg)
}
}
return err
}
func (self *ipcClient) Recv() (interface{}, error) {
return self.coder.ReadResponse()
}
func (self *ipcClient) SupportedModules() (map[string]string, error) {
req := shared.Request{
Id: 1,
Jsonrpc: "2.0",
Method: "rpc_modules",
}
if err := self.coder.WriteResponse(req); err != nil {
return nil, err
}
res, _ := self.coder.ReadResponse()
if sucRes, ok := res.(*shared.SuccessResponse); ok {
data, _ := json.Marshal(sucRes.Result)
modules := make(map[string]string)
if err := json.Unmarshal(data, &modules); err == nil {
return modules, nil
}
}
// old version uses modules instead of rpc_modules, this can be removed after full migration
req.Method = "modules"
if err := self.coder.WriteResponse(req); err != nil {
return nil, err
}
res, err := self.coder.ReadResponse()
if err != nil {
return nil, err
}
if sucRes, ok := res.(*shared.SuccessResponse); ok {
data, _ := json.Marshal(sucRes.Result)
modules := make(map[string]string)
err = json.Unmarshal(data, &modules)
if err == nil {
return modules, nil
}
}
return nil, fmt.Errorf("Invalid response")
}
// Create a new IPC client, UNIX domain socket on posix, named pipe on Windows
func NewIpcClient(cfg IpcConfig, codec codec.Codec) (*ipcClient, error) {
return newIpcClient(cfg, codec)
}
// Start IPC server
func StartIpc(cfg IpcConfig, codec codec.Codec, initializer InitFunc) error {
l, err := ipcListen(cfg)
if err != nil {
return err
}
go ipcLoop(cfg, codec, initializer, l)
return nil
}
// CreateListener creates an listener, on Unix platforms this is a unix socket, on Windows this is a named pipe
func CreateListener(cfg IpcConfig) (net.Listener, error) {
return ipcListen(cfg)
}
func ipcLoop(cfg IpcConfig, codec codec.Codec, initializer InitFunc, l net.Listener) {
glog.V(logger.Info).Infof("IPC service started (%s)\n", cfg.Endpoint)
defer os.Remove(cfg.Endpoint)
defer l.Close()
for {
conn, err := l.Accept()
if err != nil {
glog.V(logger.Debug).Infof("accept: %v", err)
return
}
id := newIpcConnId()
go func() {
defer conn.Close()
glog.V(logger.Debug).Infof("new connection with id %06d started", id)
stopper, api, err := initializer(conn)
if err != nil {
glog.V(logger.Error).Infof("Unable to initialize IPC connection: %v", err)
return
}
defer stopper.Stop()
handle(id, conn, api, codec)
}()
}
}
func newIpcConnId() int {
return rand.Int() % 1000000
}
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