122 lines
3.1 KiB
Go
122 lines
3.1 KiB
Go
/*
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This file is part of go-ethereum
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go-ethereum is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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go-ethereum is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
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*/
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package rpcws
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import (
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"fmt"
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"net"
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"net/http"
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"github.com/ethereum/go-ethereum/logger"
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"github.com/ethereum/go-ethereum/rpc"
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"github.com/ethereum/go-ethereum/xeth"
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"golang.org/x/net/websocket"
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)
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var wslogger = logger.NewLogger("RPC-WS")
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var JSON rpc.JsonWrapper
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type WebSocketServer struct {
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pipe *xeth.XEth
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port int
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doneCh chan bool
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listener net.Listener
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}
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func NewWebSocketServer(pipe *xeth.XEth, port int) (*WebSocketServer, error) {
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sport := fmt.Sprintf(":%d", port)
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l, err := net.Listen("tcp", sport)
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if err != nil {
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return nil, err
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}
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return &WebSocketServer{
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pipe,
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port,
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make(chan bool),
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l,
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}, nil
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}
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func (self *WebSocketServer) handlerLoop() {
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for {
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select {
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case <-self.doneCh:
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wslogger.Infoln("Shutdown RPC-WS server")
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return
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}
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}
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}
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func (self *WebSocketServer) Stop() {
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close(self.doneCh)
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}
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func (self *WebSocketServer) Start() {
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wslogger.Infof("Starting RPC-WS server on port %d", self.port)
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go self.handlerLoop()
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api := rpc.NewEthereumApi(self.pipe)
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h := self.apiHandler(api)
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http.Handle("/ws", h)
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err := http.Serve(self.listener, nil)
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if err != nil {
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wslogger.Errorln("Error on RPC-WS interface:", err)
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}
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}
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func (s *WebSocketServer) apiHandler(api *rpc.EthereumApi) http.Handler {
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fn := func(w http.ResponseWriter, req *http.Request) {
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h := sockHandler(api)
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s := websocket.Server{Handler: h}
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s.ServeHTTP(w, req)
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}
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return http.HandlerFunc(fn)
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}
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func sockHandler(api *rpc.EthereumApi) websocket.Handler {
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var jsonrpcver string = "2.0"
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fn := func(conn *websocket.Conn) {
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for {
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wslogger.Debugln("Handling connection")
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var reqParsed rpc.RpcRequest
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// reqParsed, reqerr := JSON.ParseRequestBody(conn.Request())
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if err := websocket.JSON.Receive(conn, &reqParsed); err != nil {
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jsonerr := &rpc.RpcErrorObject{-32700, "Error: Could not parse request"}
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JSON.Send(conn, &rpc.RpcErrorResponse{JsonRpc: jsonrpcver, ID: nil, Error: jsonerr})
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continue
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}
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var response interface{}
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reserr := api.GetRequestReply(&reqParsed, &response)
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if reserr != nil {
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wslogger.Warnln(reserr)
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jsonerr := &rpc.RpcErrorObject{-32603, reserr.Error()}
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JSON.Send(conn, &rpc.RpcErrorResponse{JsonRpc: jsonrpcver, ID: reqParsed.ID, Error: jsonerr})
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continue
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}
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wslogger.Debugf("Generated response: %T %s", response, response)
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JSON.Send(conn, &rpc.RpcSuccessResponse{JsonRpc: jsonrpcver, ID: reqParsed.ID, Result: response})
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}
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}
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return websocket.Handler(fn)
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}
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