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package rpc
import (
"encoding/json"
"fmt"
"io"
"io/ioutil"
"net"
"net/http"
"github.com/ethereum/go-ethereum/logger"
"github.com/ethereum/go-ethereum/xeth"
"github.com/rs/cors"
)
var rpclogger = logger.NewLogger("RPC")
const (
jsonrpcver = "2.0"
maxSizeReqLength = 1024 * 1024 // 1MB
)
func Start(pipe *xeth.XEth, config RpcConfig) error {
l, err := net.Listen("tcp", fmt.Sprintf("%s:%d", config.ListenAddress, config.ListenPort))
if err != nil {
rpclogger.Errorf("Can't listen on %s:%d: %v", config.ListenAddress, config.ListenPort, err)
return err
}
var handler http.Handler
if len(config.CorsDomain) > 0 {
var opts cors.Options
opts.AllowedMethods = []string{"POST"}
opts.AllowedOrigins = []string{config.CorsDomain}
c := cors.New(opts)
handler = c.Handler(JSONRPC(pipe))
} else {
handler = JSONRPC(pipe)
}
go http.Serve(l, handler)
return nil
}
// JSONRPC returns a handler that implements the Ethereum JSON-RPC API.
func JSONRPC(pipe *xeth.XEth) http.Handler {
api := NewEthereumApi(pipe)
return http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
w.Header().Set("Content-Type", "application/json")
// Limit request size to resist DoS
if req.ContentLength > maxSizeReqLength {
jsonerr := &RpcErrorObject{-32700, "Request too large"}
send(w, &RpcErrorResponse{Jsonrpc: jsonrpcver, Id: nil, Error: jsonerr})
return
}
// Read request body
defer req.Body.Close()
body, err := ioutil.ReadAll(req.Body)
if err != nil {
jsonerr := &RpcErrorObject{-32700, "Could not read request body"}
send(w, &RpcErrorResponse{Jsonrpc: jsonrpcver, Id: nil, Error: jsonerr})
}
// Try to parse the request as a single
var reqSingle RpcRequest
if err := json.Unmarshal(body, &reqSingle); err == nil {
response := RpcResponse(api, &reqSingle)
send(w, &response)
return
}
// Try to parse the request to batch
var reqBatch []RpcRequest
if err := json.Unmarshal(body, &reqBatch); err == nil {
// Build response batch
resBatch := make([]*interface{}, len(reqBatch))
for i, request := range reqBatch {
response := RpcResponse(api, &request)
resBatch[i] = response
}
send(w, resBatch)
return
}
// Not a batch or single request, error
jsonerr := &RpcErrorObject{-32600, "Could not decode request"}
send(w, &RpcErrorResponse{Jsonrpc: jsonrpcver, Id: nil, Error: jsonerr})
})
}
func RpcResponse(api *EthereumApi, request *RpcRequest) *interface{} {
var reply, response interface{}
reserr := api.GetRequestReply(request, &reply)
switch reserr.(type) {
case nil:
response = &RpcSuccessResponse{Jsonrpc: jsonrpcver, Id: request.Id, Result: reply}
case *NotImplementedError:
jsonerr := &RpcErrorObject{-32601, reserr.Error()}
response = &RpcErrorResponse{Jsonrpc: jsonrpcver, Id: request.Id, Error: jsonerr}
case *DecodeParamError, *InsufficientParamsError, *ValidationError, *InvalidTypeError:
jsonerr := &RpcErrorObject{-32602, reserr.Error()}
response = &RpcErrorResponse{Jsonrpc: jsonrpcver, Id: request.Id, Error: jsonerr}
default:
jsonerr := &RpcErrorObject{-32603, reserr.Error()}
response = &RpcErrorResponse{Jsonrpc: jsonrpcver, Id: request.Id, Error: jsonerr}
}
rpclogger.DebugDetailf("Generated response: %T %s", response, response)
return &response
}
func send(writer io.Writer, v interface{}) (n int, err error) {
var payload []byte
payload, err = json.MarshalIndent(v, "", "\t")
if err != nil {
rpclogger.Fatalln("Error marshalling JSON", err)
return 0, err
}
rpclogger.DebugDetailf("Sending payload: %s", payload)
return writer.Write(payload)
}
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