rpc: migrated the RPC insterface to a new reflection based RPC layer

rpc/ipc.go

@@ -0,0 +1,84 @@
+// Copyright 2015 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package rpc
+
+import (
+	"encoding/json"
+	"net"
+)
+
+// CreateIPCListener creates an listener, on Unix platforms this is a unix socket, on Windows this is a named pipe
+func CreateIPCListener(endpoint string) (net.Listener, error) {
+	return ipcListen(endpoint)
+}
+
+// ipcClient represent an IPC RPC client. It will connect to a given endpoint and tries to communicate with a node using
+// JSON serialization.
+type ipcClient struct {
+	endpoint string
+	conn     net.Conn
+	out      *json.Encoder
+	in       *json.Decoder
+}
+
+// NewIPCClient create a new IPC client that will connect on the given endpoint. Messages are JSON encoded and encoded.
+// On Unix it assumes the endpoint is the full path to a unix socket, and Windows the endpoint is an identifier for a
+// named pipe.
+func NewIPCClient(endpoint string) (*ipcClient, error) {
+	conn, err := newIPCConnection(endpoint)
+	if err != nil {
+		return nil, err
+	}
+	return &ipcClient{endpoint: endpoint, conn: conn, in: json.NewDecoder(conn), out: json.NewEncoder(conn)}, nil
+}
+
+// Send will serialize the given message and send it to the server.
+// When sending the message fails it will try to reconnect once and send the message again.
+func (client *ipcClient) Send(msg interface{}) error {
+	if err := client.out.Encode(msg); err == nil {
+		return nil
+	}
+
+	// retry once
+	client.conn.Close()
+
+	conn, err := newIPCConnection(client.endpoint)
+	if err != nil {
+		return err
+	}
+
+	client.conn = conn
+	client.in = json.NewDecoder(conn)
+	client.out = json.NewEncoder(conn)
+
+	return client.out.Encode(msg)
+}
+
+// Recv will read a message from the connection and tries to parse it. It assumes the received message is JSON encoded.
+func (client *ipcClient) Recv(msg interface{}) error {
+	return client.in.Decode(&msg)
+}
+
+// Close will close the underlying IPC connection
+func (client *ipcClient) Close() {
+	client.conn.Close()
+}
+
+// SupportedModules will return the collection of offered RPC modules.
+func (client *ipcClient) SupportedModules() (map[string]string, error) {
+	return SupportedModules(client)
+}