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// Copyright 2015 The go-ethereum Authors
// This file is part of go-ethereum.
//
// go-ethereum 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.
//
// go-ethereum 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 go-ethereum. If not, see <http://www.gnu.org/licenses/>.
package comms
import (
"fmt"
"math/rand"
"net"
"encoding/json"
"github.com/ethereum/go-ethereum/rpc/codec"
"github.com/ethereum/go-ethereum/rpc/shared"
)
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(req interface{}) error {
var err error
if r, ok := req.(*shared.Request); ok {
if err = self.coder.WriteResponse(r); err != nil {
if _, ok := err.(*net.OpError); ok { // connection lost, retry once
if err = self.reconnect(); err == nil {
err = self.coder.WriteResponse(r)
}
}
}
return err
}
return fmt.Errorf("Invalid request (%T)", req)
}
func (self *ipcClient) Recv() (interface{}, error) {
res, err := self.coder.ReadResponse()
if err != nil {
return nil, err
}
if r, ok := res.(shared.SuccessResponse); ok {
return r.Result, nil
}
if r, ok := res.(shared.ErrorResponse); ok {
return r.Error, nil
}
return res, err
}
func (self *ipcClient) SupportedModules() (map[string]string, error) {
req := shared.Request{
Id: 1,
Jsonrpc: "2.0",
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, offeredApi shared.EthereumApi) error {
return startIpc(cfg, codec, offeredApi)
}
func newIpcConnId() int {
return rand.Int() % 1000000
}
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