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path: root/rpc/ws/server.go
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/*
  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 rpcws

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

    "code.google.com/p/go.net/websocket"
    "github.com/ethereum/go-ethereum/eth"
    "github.com/ethereum/go-ethereum/event/filter"
    "github.com/ethereum/go-ethereum/logger"
    "github.com/ethereum/go-ethereum/rpc"
    "github.com/ethereum/go-ethereum/xeth"
)

var wslogger = logger.NewLogger("RPC-WS")

type WebSocketServer struct {
    eth           *eth.Ethereum
    filterManager *filter.FilterManager
    port          int
    doneCh        chan bool
    listener      net.Listener
}

func NewWebSocketServer(eth *eth.Ethereum, port int) (*WebSocketServer, error) {
    sport := fmt.Sprintf(":%d", port)
    l, err := net.Listen("tcp", sport)
    if err != nil {
        return nil, err
    }

    filterManager := filter.NewFilterManager(eth.EventMux())
    go filterManager.Start()

    return &WebSocketServer{eth,
        filterManager,
        port,
        make(chan bool),
        l,
    }, nil
}

func (self *WebSocketServer) handlerLoop() {
    for {
        select {
        case <-self.doneCh:
            wslogger.Infoln("Shutdown RPC-WS server")
            return
        }
    }
}

func (self *WebSocketServer) Stop() {
    close(self.doneCh)
}

func (self *WebSocketServer) Start() {
    wslogger.Infof("Starting RPC-WS server on port %d", self.port)
    go self.handlerLoop()

    api := rpc.NewEthereumApi(xeth.New(self.eth))
    h := self.apiHandler(api)
    http.Handle("/ws", h)

    err := http.Serve(self.listener, nil)
    if err != nil {
        wslogger.Errorln("Error on RPC-WS interface:", err)
    }
}

func (s *WebSocketServer) apiHandler(api *rpc.EthereumApi) http.Handler {
    fn := func(w http.ResponseWriter, req *http.Request) {
        h := sockHandler(api)
        s := websocket.Server{Handler: h}
        s.ServeHTTP(w, req)
    }

    return http.HandlerFunc(fn)
}

func sockHandler(api *rpc.EthereumApi) websocket.Handler {
    fn := func(conn *websocket.Conn) {
        for {
            wslogger.Debugln("Handling request")
            var reqParsed rpc.RpcRequest

            if err := websocket.JSON.Receive(conn, &reqParsed); err != nil {
                wslogger.Debugln(rpc.ErrorParseRequest)
                websocket.JSON.Send(conn, rpc.RpcErrorResponse{JsonRpc: reqParsed.JsonRpc, ID: reqParsed.ID, Error: true, ErrorText: rpc.ErrorParseRequest})
                continue
            }

            var response interface{}
            reserr := api.GetRequestReply(&reqParsed, &response)
            if reserr != nil {
                wslogger.Errorln(reserr)
                websocket.JSON.Send(conn, rpc.RpcErrorResponse{JsonRpc: reqParsed.JsonRpc, ID: reqParsed.ID, Error: true, ErrorText: reserr.Error()})
                continue
            }

            wslogger.Debugf("Generated response: %T %s", response, response)
            websocket.JSON.Send(conn, rpc.RpcSuccessResponse{JsonRpc: reqParsed.JsonRpc, ID: reqParsed.ID, Error: false, Result: response})
        }
    }
    return websocket.Handler(fn)
}