rpc: add dataDir parameter and JSON-RPC handler

rpc/api.go

@@ -11,6 +11,7 @@ package rpc
 import (
 	"fmt"
 	"math/big"
+	"path"
 	"strings"
 	"sync"
 	"time"
@@ -55,8 +56,8 @@ type EthereumApi struct {
 	defaultBlockAge int64
 }
 
-func NewEthereumApi(eth *xeth.XEth) *EthereumApi {
-	db, _ := ethdb.NewLDBDatabase("dapps")
+func NewEthereumApi(eth *xeth.XEth, dataDir string) *EthereumApi {
+	db, _ := ethdb.NewLDBDatabase(path.Join(dataDir, "dapps"))
 	api := &EthereumApi{
 		eth:             eth,
 		mux:             eth.Backend().EventMux(),

rpc/http.go

@@ -0,0 +1,42 @@
+package rpc
+
+import (
+	"net/http"
+
+	"github.com/ethereum/go-ethereum/logger"
+	"github.com/ethereum/go-ethereum/xeth"
+)
+
+var rpchttplogger = logger.NewLogger("RPC-HTTP")
+
+// JSONRPC returns a handler that implements the Ethereum JSON-RPC API.
+func JSONRPC(pipe *xeth.XEth, dataDir string) http.Handler {
+	var json JsonWrapper
+	const jsonrpcver = "2.0"
+	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")
+
+		reqParsed, reqerr := json.ParseRequestBody(req)
+		if reqerr != nil {
+			jsonerr := &RpcErrorObject{-32700, "Error: Could not parse request"}
+			json.Send(w, &RpcErrorResponse{JsonRpc: jsonrpcver, ID: nil, Error: jsonerr})
+			return
+		}
+
+		var response interface{}
+		reserr := api.GetRequestReply(&reqParsed, &response)
+		if reserr != nil {
+			rpchttplogger.Warnln(reserr)
+			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})
+	})
+}