github.com/jeffallen/go-ethereum@v1.1.4-0.20150910155051-571d3236c49c/rpc/comms/ipc.go (about)

     1  // Copyright 2015 The go-ethereum Authors
     2  // This file is part of the go-ethereum library.
     3  //
     4  // The go-ethereum library is free software: you can redistribute it and/or modify
     5  // it under the terms of the GNU Lesser General Public License as published by
     6  // the Free Software Foundation, either version 3 of the License, or
     7  // (at your option) any later version.
     8  //
     9  // The go-ethereum library is distributed in the hope that it will be useful,
    10  // but WITHOUT ANY WARRANTY; without even the implied warranty of
    11  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    12  // GNU Lesser General Public License for more details.
    13  //
    14  // You should have received a copy of the GNU Lesser General Public License
    15  // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
    16  
    17  package comms
    18  
    19  import (
    20  	"fmt"
    21  	"math/rand"
    22  	"net"
    23  
    24  	"encoding/json"
    25  
    26  	"github.com/ethereum/go-ethereum/rpc/codec"
    27  	"github.com/ethereum/go-ethereum/rpc/shared"
    28  )
    29  
    30  type IpcConfig struct {
    31  	Endpoint string
    32  }
    33  
    34  type ipcClient struct {
    35  	endpoint string
    36  	c        net.Conn
    37  	codec    codec.Codec
    38  	coder    codec.ApiCoder
    39  }
    40  
    41  func (self *ipcClient) Close() {
    42  	self.coder.Close()
    43  }
    44  
    45  func (self *ipcClient) Send(msg interface{}) error {
    46  	var err error
    47  	if err = self.coder.WriteResponse(msg); err != nil {
    48  		if err = self.reconnect(); err == nil {
    49  			err = self.coder.WriteResponse(msg)
    50  		}
    51  	}
    52  	return err
    53  }
    54  
    55  func (self *ipcClient) Recv() (interface{}, error) {
    56  	return self.coder.ReadResponse()
    57  }
    58  
    59  func (self *ipcClient) SupportedModules() (map[string]string, error) {
    60  	req := shared.Request{
    61  		Id:      1,
    62  		Jsonrpc: "2.0",
    63  		Method:  "modules",
    64  	}
    65  
    66  	if err := self.coder.WriteResponse(req); err != nil {
    67  		return nil, err
    68  	}
    69  
    70  	res, err := self.coder.ReadResponse()
    71  	if err != nil {
    72  		return nil, err
    73  	}
    74  
    75  	if sucRes, ok := res.(*shared.SuccessResponse); ok {
    76  		data, _ := json.Marshal(sucRes.Result)
    77  		modules := make(map[string]string)
    78  		err = json.Unmarshal(data, &modules)
    79  		if err == nil {
    80  			return modules, nil
    81  		}
    82  	}
    83  
    84  	return nil, fmt.Errorf("Invalid response")
    85  }
    86  
    87  // Create a new IPC client, UNIX domain socket on posix, named pipe on Windows
    88  func NewIpcClient(cfg IpcConfig, codec codec.Codec) (*ipcClient, error) {
    89  	return newIpcClient(cfg, codec)
    90  }
    91  
    92  // Start IPC server
    93  func StartIpc(cfg IpcConfig, codec codec.Codec, initializer func(conn net.Conn) (shared.EthereumApi, error)) error {
    94  	return startIpc(cfg, codec, initializer)
    95  }
    96  
    97  func newIpcConnId() int {
    98  	return rand.Int() % 1000000
    99  }