path: root/rpc/http.go

package rpc

import (
    "net/http"

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

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

const (
    jsonrpcver       = "2.0"
    maxSizeReqLength = 1024 * 1024 // 1MB
)

// JSONRPC returns a handler that implements the Ethereum JSON-RPC API.
func JSONRPC(pipe *xeth.XEth, dataDir string) http.Handler {
    var json JsonWrapper
    api := NewEthereumApi(pipe, dataDir)

    return http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
        w.Header().Set("Access-Control-Allow-Origin", "*")

        rpchttplogger.DebugDetailln("Handling request")

        if req.ContentLength > maxSizeReqLength {
            jsonerr := &RpcErrorObject{-32700, "Request too large"}
            json.Send(w, &RpcErrorResponse{JsonRpc: jsonrpcver, ID: nil, Error: jsonerr})
            return
        }

        reqParsed, reqerr := json.ParseRequestBody(req)
        switch reqerr.(type) {
        case nil:
            break
        case *DecodeParamError:
            jsonerr := &RpcErrorObject{-32602, reqerr.Error()}
            json.Send(w, &RpcErrorResponse{JsonRpc: jsonrpcver, ID: nil, Error: jsonerr})
            return
        case *InsufficientParamsError:
            jsonerr := &RpcErrorObject{-32602, reqerr.Error()}
            json.Send(w, &RpcErrorResponse{JsonRpc: jsonrpcver, ID: nil, Error: jsonerr})
            return
        case *ValidationError:
            jsonerr := &RpcErrorObject{-32602, reqerr.Error()}
            json.Send(w, &RpcErrorResponse{JsonRpc: jsonrpcver, ID: nil, Error: jsonerr})
            return
        default:
            jsonerr := &RpcErrorObject{-32700, "Could not parse request"}
            json.Send(w, &RpcErrorResponse{JsonRpc: jsonrpcver, ID: nil, Error: jsonerr})
            return
        }

        var response interface{}
        reserr := api.GetRequestReply(&reqParsed, &response)
        switch reserr.(type) {
        case nil:
            break
        case *NotImplementedError:
            jsonerr := &RpcErrorObject{-32601, reserr.Error()}
            json.Send(w, &RpcErrorResponse{JsonRpc: jsonrpcver, ID: reqParsed.ID, Error: jsonerr})
            return
        case *InsufficientParamsError:
            jsonerr := &RpcErrorObject{-32602, reserr.Error()}
            json.Send(w, &RpcErrorResponse{JsonRpc: jsonrpcver, ID: reqParsed.ID, Error: jsonerr})
            return
        case *ValidationError:
            jsonerr := &RpcErrorObject{-32602, reserr.Error()}
            json.Send(w, &RpcErrorResponse{JsonRpc: jsonrpcver, ID: reqParsed.ID, Error: jsonerr})
            return
        default:
            jsonerr := &RpcErrorObject{-32603, reserr.Error()}
            json.Send(w, &RpcErrorResponse{JsonRpc: jsonrpcver, ID: reqParsed.ID, Error: jsonerr})
            return
        }

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