rpc: add dataDir parameter and JSON-RPC handler

cmd/ethereum/main.go

@@ -170,9 +170,7 @@ func runjs(ctx *cli.Context) {
 func startEth(ctx *cli.Context, eth *eth.Ethereum) {
 	utils.StartEthereum(eth)
 	if ctx.GlobalBool(utils.RPCEnabledFlag.Name) {
-		addr := ctx.GlobalString(utils.RPCListenAddrFlag.Name)
-		port := ctx.GlobalInt(utils.RPCPortFlag.Name)
-		utils.StartRpc(eth, addr, port)
+		utils.StartRPC(eth, ctx)
 	}
 	if ctx.GlobalBool(utils.MiningEnabledFlag.Name) {
 		eth.Miner().Start()

cmd/utils/cmd.go

@@ -34,9 +34,7 @@ import (
 	"github.com/ethereum/go-ethereum/ethutil"
 	"github.com/ethereum/go-ethereum/logger"
 	"github.com/ethereum/go-ethereum/rlp"
-	rpchttp "github.com/ethereum/go-ethereum/rpc/http"
 	"github.com/ethereum/go-ethereum/state"
-	"github.com/ethereum/go-ethereum/xeth"
 )
 
 var clilogger = logger.NewLogger("CLI")
@@ -165,16 +163,6 @@ func KeyTasks(keyManager *crypto.KeyManager, KeyRing string, GenAddr bool, Secre
 	clilogger.Infof("Main address %x\n", keyManager.Address())
 }
 
-func StartRpc(ethereum *eth.Ethereum, RpcListenAddress string, RpcPort int) {
-	var err error
-	ethereum.RpcServer, err = rpchttp.NewRpcHttpServer(xeth.New(ethereum), RpcListenAddress, RpcPort)
-	if err != nil {
-		clilogger.Errorf("Could not start RPC interface (port %v): %v", RpcPort, err)
-	} else {
-		go ethereum.RpcServer.Start()
-	}
-}
-
 func FormatTransactionData(data string) []byte {
 	d := ethutil.StringToByteFunc(data, func(s string) (ret []byte) {
 		slice := regexp.MustCompile("\\n|\\s").Split(s, 1000000000)

cmd/utils/flags.go

@@ -2,6 +2,10 @@ package utils
 
 import (
 	"crypto/ecdsa"
+	"fmt"
+	"net"
+	"net/http"
+	"os"
 	"path"
 	"runtime"
 	"time"
@@ -17,6 +21,8 @@ import (
 	"github.com/ethereum/go-ethereum/logger"
 	"github.com/ethereum/go-ethereum/p2p"
 	"github.com/ethereum/go-ethereum/p2p/nat"
+	"github.com/ethereum/go-ethereum/rpc"
+	"github.com/ethereum/go-ethereum/xeth"
 )
 
 // NewApp creates an app with sane defaults.
@@ -183,3 +189,15 @@ func GetAccountManager(ctx *cli.Context) *accounts.Manager {
 	ks := crypto.NewKeyStorePassphrase(path.Join(dataDir, "keys"))
 	return accounts.NewManager(ks, 300*time.Second)
 }
+
+func StartRPC(eth *eth.Ethereum, ctx *cli.Context) {
+	addr := ctx.GlobalString(RPCListenAddrFlag.Name)
+	port := ctx.GlobalInt(RPCPortFlag.Name)
+	dataDir := ctx.GlobalString(DataDirFlag.Name)
+
+	l, err := net.Listen("tcp", fmt.Sprintf("%s:%d", addr, port))
+	if err != nil {
+		Fatalf("Can't listen on %s:%d: %v", addr, port, err)
+	}
+	go http.Serve(l, rpc.JSONRPC(xeth.New(eth), dataDir))
+}

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

+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})
+	})
+}