added RPC/IPC support

rpc/api/utils.go

@@ -8,6 +8,7 @@ import (
 	"github.com/ethereum/go-ethereum/eth"
 	"github.com/ethereum/go-ethereum/rpc/codec"
 	"github.com/ethereum/go-ethereum/xeth"
+	"github.com/ethereum/go-ethereum/rpc/shared"
 )
 
 const (
@@ -34,3 +35,43 @@ func ParseApiString(apistr string, codec codec.Codec, xeth *xeth.XEth, eth *eth.
 
 	return apis, nil
 }
+
+// combines multiple API's
+type mergedApi struct {
+	apis map[string]EthereumApi
+}
+
+// create new merged api instance
+func newMergedApi(apis ...EthereumApi) *mergedApi {
+	mergedApi := new(mergedApi)
+	mergedApi.apis = make(map[string]EthereumApi)
+
+	for _, api := range apis {
+		for _, method := range api.Methods() {
+			mergedApi.apis[method] = api
+		}
+	}
+	return mergedApi
+}
+
+// Supported RPC methods
+func (self *mergedApi) Methods() []string {
+	all := make([]string, len(self.apis))
+	for method, _ := range self.apis {
+		all = append(all, method)
+	}
+	return all
+}
+
+// Call the correct API's Execute method for the given request
+func (self *mergedApi) Execute(req *shared.Request) (interface{}, error) {
+	if api, found := self.apis[req.Method]; found {
+		return api.Execute(req)
+	}
+	return nil, shared.NewNotImplementedError(req.Method)
+}
+
+// Merge multiple API's to a single API instance
+func Merge(apis ...EthereumApi) EthereumApi {
+	return newMergedApi(apis...)
+}

rpc/comms/comms.go

+package comms
+
+type EthereumClient interface {
+	Close()
+	Send(interface{}) error
+	Recv() (interface{}, error)
+}

rpc/comms/ipc.go

+package comms
+
+import (
+	"github.com/ethereum/go-ethereum/rpc/api"
+	"github.com/ethereum/go-ethereum/rpc/codec"
+)
+
+type IpcConfig struct {
+	Endpoint string
+}
+
+type ipcClient struct {
+	c codec.ApiCoder
+}
+
+func (self *ipcClient) Close() {
+	self.c.Close()
+}
+
+func (self *ipcClient) Send(req interface{}) error {
+	return self.c.WriteResponse(req)
+}
+
+func (self *ipcClient) Recv() (interface{}, error) {
+	return self.c.ReadResponse()
+}
+
+// Create a new IPC client, UNIX domain socket on posix, named pipe on Windows
+func NewIpcClient(cfg IpcConfig, codec codec.Codec) (*ipcClient, error) {
+	return newIpcClient(cfg, codec)
+}
+
+// Start IPC server
+func StartIpc(cfg IpcConfig, codec codec.Codec, apis ...api.EthereumApi) error {
+	offeredApi := api.Merge(apis...)
+	return startIpc(cfg, codec, offeredApi)
+}

rpc/comms/ipc_unix.go

+// +build darwin dragonfly freebsd linux nacl netbsd openbsd solaris
+
+package comms
+
+import (
+    "io"
+	"net"
+    "os"
+
+	"github.com/ethereum/go-ethereum/logger"
+	"github.com/ethereum/go-ethereum/logger/glog"
+	"github.com/ethereum/go-ethereum/rpc/api"
+	"github.com/ethereum/go-ethereum/rpc/codec"
+	"github.com/ethereum/go-ethereum/rpc/shared"
+)
+
+func newIpcClient(cfg IpcConfig, codec codec.Codec) (*ipcClient, error) {
+	c, err := net.DialUnix("unix", nil, &net.UnixAddr{cfg.Endpoint, "unix"})
+	if err != nil {
+		return nil, err
+	}
+
+	return &ipcClient{codec.New(c)}, nil
+}
+
+func startIpc(cfg IpcConfig, codec codec.Codec, api api.EthereumApi) error {
+	os.Remove(cfg.Endpoint) // in case it still exists from a previous run
+
+	l, err := net.ListenUnix("unix", &net.UnixAddr{Name: cfg.Endpoint, Net: "unix"})
+	if err != nil {
+		return err
+	}
+	os.Chmod(cfg.Endpoint, 0600)
+
+	go func() {
+		for {
+			conn, err := l.AcceptUnix()
+			if err != nil {
+				glog.V(logger.Error).Infof("Error accepting ipc connection - %v\n", err)
+				continue
+			}
+
+			go func(conn net.Conn) {
+				codec := codec.New(conn)
+
+				for {
+					req, err := codec.ReadRequest()
+					if err == io.EOF {
+						codec.Close()
+						return
+					} else if err != nil {
+						glog.V(logger.Error).Infof("IPC recv err - %v\n", err)
+						codec.Close()
+						return
+					}
+
+					var rpcResponse interface{}
+					res, err := api.Execute(req)
+
+					rpcResponse = shared.NewRpcResponse(req.Id, req.Jsonrpc, res, err)
+					err = codec.WriteResponse(rpcResponse)
+					if err != nil {
+						glog.V(logger.Error).Infof("IPC send err - %v\n", err)
+						codec.Close()
+						return
+					}
+				}
+			}(conn)
+		}
+
+		os.Remove(cfg.Endpoint)
+	}()
+    
+    glog.V(logger.Info).Infof("IPC service started (%s)\n", cfg.Endpoint)
+    
+	return nil
+}

rpc/shared/types.go

 package shared
 
-import "encoding/json"
+import (
+	"encoding/json"
+	"github.com/ethereum/go-ethereum/logger"
+	"github.com/ethereum/go-ethereum/logger/glog"
+)
 
 // RPC request
 type Request struct {
@@ -36,3 +40,24 @@ type ErrorObject struct {
 	Message string `json:"message"`
 	// Data    interface{} `json:"data"`
 }
+
+func NewRpcResponse(id interface{}, jsonrpcver string, reply interface{}, err error) *interface{} {
+	var response interface{}
+
+	switch err.(type) {
+		case nil:
+		response = &SuccessResponse{Jsonrpc: jsonrpcver, Id: id, Result: reply}
+		case *NotImplementedError:
+		jsonerr := &ErrorObject{-32601, err.Error()}
+		response = &ErrorResponse{Jsonrpc: jsonrpcver, Id: id, Error: jsonerr}
+		case *DecodeParamError, *InsufficientParamsError, *ValidationError, *InvalidTypeError:
+		jsonerr := &ErrorObject{-32602, err.Error()}
+		response = &ErrorResponse{Jsonrpc: jsonrpcver, Id: id, Error: jsonerr}
+		default:
+		jsonerr := &ErrorObject{-32603, err.Error()}
+		response = &ErrorResponse{Jsonrpc: jsonrpcver, Id: id, Error: jsonerr}
+	}
+
+	glog.V(logger.Detail).Infof("Generated response: %T %s", response, response)
+	return &response
+}