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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 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
const maxSizeReqLength = 1024 * 1024 // 1MB
func NewRpcHttpServer(pipe *xeth.XEth, address string, port int) (*RpcHttpServer, error) {
sport := fmt.Sprintf("%s:%d", address, 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,
addr: address,
}, nil
}
type RpcHttpServer struct {
quit chan bool
listener net.Listener
pipe *xeth.XEth
port int
addr string
}
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 %s:%d", s.addr, 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")
if req.ContentLength > maxSizeReqLength {
jsonerr := &rpc.RpcErrorObject{-32700, "Error: Request too large"}
JSON.Send(w, &rpc.RpcErrorResponse{JsonRpc: jsonrpcver, ID: nil, Error: jsonerr})
return
}
reqParsed, reqerr := JSON.ParseRequestBody(req)
if reqerr != nil {
jsonerr := &rpc.RpcErrorObject{-32700, "Error: Could not parse request"}
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.DebugDetailf("Generated response: %T %s", response, response)
JSON.Send(w, &rpc.RpcSuccessResponse{JsonRpc: jsonrpcver, ID: reqParsed.ID, Result: response})
}
return http.HandlerFunc(fn)
}
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