path: root/rpc/http/server.go

/*
    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 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 General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with go-ethereum.  If not, see <http://www.gnu.org/licenses/>.
*/
package rpchttp

import (
    "fmt"
    "net"
    "net/http"

    "github.com/ethereum/go-ethereum/logger"
    "github.com/ethereum/go-ethereum/rpc"
    "github.com/ethereum/go-ethereum/xeth"
)

var rpchttplogger = logger.NewLogger("RPC-HTTP")
var JSON rpc.JsonWrapper

func NewRpcHttpServer(pipe *xeth.XEth, port int) (*RpcHttpServer, error) {
    sport := fmt.Sprintf(":%d", port)
    l, err := net.Listen("tcp", sport)
    if err != nil {
        return nil, err
    }

    return &RpcHttpServer{
        listener: l,
        quit:     make(chan bool),
        pipe:     pipe,
        port:     port,
    }, nil
}

type RpcHttpServer struct {
    quit     chan bool
    listener net.Listener
    pipe     *xeth.XEth
    port     int
}

func (s *RpcHttpServer) exitHandler() {
out:
    for {
        select {
        case <-s.quit:
            s.listener.Close()
            break out
        }
    }

    rpchttplogger.Infoln("Shutdown RPC-HTTP server")
}

func (s *RpcHttpServer) Stop() {
    close(s.quit)
}

func (s *RpcHttpServer) Start() {
    rpchttplogger.Infof("Starting RPC-HTTP server on port %d", s.port)
    go s.exitHandler()

    api := rpc.NewEthereumApi(s.pipe)
    h := s.apiHandler(api)
    http.Handle("/", h)

    err := http.Serve(s.listener, nil)
    // FIX Complains on shutdown due to listner already being closed
    if err != nil {
        rpchttplogger.Errorln("Error on RPC-HTTP interface:", err)
    }
}

func (s *RpcHttpServer) apiHandler(api *rpc.EthereumApi) http.Handler {
    var jsonrpcver string = "2.0"
    fn := func(w http.ResponseWriter, req *http.Request) {
        w.Header().Set("Access-Control-Allow-Origin", "*")

        rpchttplogger.DebugDetailln("Handling request")

        reqParsed, reqerr := JSON.ParseRequestBody(req)
        if reqerr != nil {
            jsonerr := &rpc.RpcErrorObject{-32700, rpc.ErrorParseRequest}
            JSON.Send(w, &rpc.RpcErrorResponse{JsonRpc: jsonrpcver, ID: nil, Error: jsonerr})
            return
        }

        var response interface{}
        reserr := api.GetRequestReply(&reqParsed, &response)
        if reserr != nil {
            rpchttplogger.Warnln(reserr)
            jsonerr := &rpc.RpcErrorObject{-32603, reserr.Error()}
            JSON.Send(w, &rpc.RpcErrorResponse{JsonRpc: jsonrpcver, ID: &reqParsed.ID, Error: jsonerr})
            return
        }

        rpchttplogger.Debugf("Generated response: %T %s", response, response)
        JSON.Send(w, &rpc.RpcSuccessResponse{JsonRpc: jsonrpcver, ID: reqParsed.ID, Result: response})
    }

    return http.HandlerFunc(fn)
}