Implemented WebSocket package

3 files changed, 263 insertions, 0 deletions

diff --git a/websocket/client.go b/websocket/client.go
new file mode 100644
index 000000000..1ff0d3f64
--- /dev/null
+++ b/websocket/client.go
@@ -0,0 +1,122 @@
+package websocket
+
+import (
+	"fmt"
+	"io"
+
+	ws "code.google.com/p/go.net/websocket"
+)
+
+const channelBufSize = 100
+
+var maxId int = 0
+
+type MsgFunc func(c *Client, msg *Message)
+
+// Chat client.
+type Client struct {
+	id     int
+	ws     *ws.Conn
+	server *Server
+	ch     chan *Message
+	doneCh chan bool
+
+	onMessage MsgFunc
+}
+
+// Create new chat client.
+func NewClient(ws *ws.Conn, server *Server) *Client {
+
+	if ws == nil {
+		panic("ws cannot be nil")
+	}
+
+	if server == nil {
+		panic("server cannot be nil")
+	}
+
+	maxId++
+	ch := make(chan *Message, channelBufSize)
+	doneCh := make(chan bool)
+
+	return &Client{maxId, ws, server, ch, doneCh, nil}
+}
+
+func (c *Client) Id() int {
+	return c.id
+}
+
+func (c *Client) Conn() *ws.Conn {
+	return c.ws
+}
+
+func (c *Client) Write(data interface{}, seed int) {
+	msg := &Message{Seed: seed, Data: data}
+	select {
+	case c.ch <- msg:
+	default:
+		c.server.Del(c)
+		err := fmt.Errorf("client %d is disconnected.", c.id)
+		c.server.Err(err)
+	}
+}
+
+func (c *Client) Done() {
+	c.doneCh <- true
+}
+
+// Listen Write and Read request via chanel
+func (c *Client) Listen() {
+	go c.listenWrite()
+	c.listenRead()
+}
+
+// Listen write request via chanel
+func (c *Client) listenWrite() {
+	logger.Debugln("Listening write to client")
+	for {
+		select {
+
+		// send message to the client
+		case msg := <-c.ch:
+			logger.Debugln("Send:", msg)
+			ws.JSON.Send(c.ws, msg)
+
+		// receive done request
+		case <-c.doneCh:
+			c.server.Del(c)
+			c.doneCh <- true // for listenRead method
+			return
+		}
+	}
+}
+
+// Listen read request via chanel
+func (c *Client) listenRead() {
+	logger.Debugln("Listening read from client")
+	for {
+		select {
+
+		// receive done request
+		case <-c.doneCh:
+			c.server.Del(c)
+			c.doneCh <- true // for listenWrite method
+			return
+
+		// read data from ws connection
+		default:
+			var msg Message
+			err := ws.JSON.Receive(c.ws, &msg)
+			if err == io.EOF {
+				c.doneCh <- true
+			} else if err != nil {
+				c.server.Err(err)
+			} else {
+				logger.Debugln(&msg)
+				if c.onMessage != nil {
+					c.onMessage(c, &msg)
+				}
+			}
+		}
+	}
+}
diff --git a/websocket/message.go b/websocket/message.go
new file mode 100644
index 000000000..30e284814
--- /dev/null
+++ b/websocket/message.go
@@ -0,0 +1,14 @@
+package websocket
+
+import "github.com/ethereum/eth-go/ethutil"
+
+type Message struct {
+	Call string        `json:"call"`
+	Args []interface{} `json:"args"`
+	Seed int           `json:"seed"`
+	Data interface{}   `json:"data"`
+}
+
+func (self *Message) Arguments() *ethutil.Value {
+	return ethutil.NewValue(self.Args)
+}
diff --git a/websocket/server.go b/websocket/server.go
new file mode 100644
index 000000000..648f3fdc3
--- /dev/null
+++ b/websocket/server.go
@@ -0,0 +1,127 @@
+package websocket
+
+import (
+	"net/http"
+
+	"github.com/ethereum/eth-go/ethlog"
+
+	ws "code.google.com/p/go.net/websocket"
+)
+
+var logger = ethlog.NewLogger("WS")
+
+// Chat server.
+type Server struct {
+	httpServ  string
+	pattern   string
+	messages  []*Message
+	clients   map[int]*Client
+	addCh     chan *Client
+	delCh     chan *Client
+	sendAllCh chan string
+	doneCh    chan bool
+	errCh     chan error
+	msgFunc   MsgFunc
+}
+
+// Create new chat server.
+func NewServer(pattern, httpServ string) *Server {
+	clients := make(map[int]*Client)
+	addCh := make(chan *Client)
+	delCh := make(chan *Client)
+	sendAllCh := make(chan string)
+	doneCh := make(chan bool)
+	errCh := make(chan error)
+
+	return &Server{
+		httpServ,
+		pattern,
+		nil,
+		clients,
+		addCh,
+		delCh,
+		sendAllCh,
+		doneCh,
+		errCh,
+		nil,
+	}
+}
+
+func (s *Server) Add(c *Client) {
+	s.addCh <- c
+}
+
+func (s *Server) Del(c *Client) {
+	s.delCh <- c
+}
+
+func (s *Server) SendAll(msg string) {
+	s.sendAllCh <- msg
+}
+
+func (s *Server) Done() {
+	s.doneCh <- true
+}
+
+func (s *Server) Err(err error) {
+	s.errCh <- err
+}
+
+func (s *Server) servHTTP() {
+	logger.Debugln("Serving http", s.httpServ)
+	err := http.ListenAndServe(s.httpServ, nil)
+
+	logger.Warnln(err)
+}
+
+func (s *Server) MessageFunc(f MsgFunc) {
+	s.msgFunc = f
+}
+
+// Listen and serve.
+// It serves client connection and broadcast request.
+func (s *Server) Listen() {
+	logger.Debugln("Listening server...")
+
+	// ws handler
+	onConnected := func(ws *ws.Conn) {
+		defer func() {
+			err := ws.Close()
+			if err != nil {
+				s.errCh <- err
+			}
+		}()
+
+		client := NewClient(ws, s)
+		client.onMessage = s.msgFunc
+		s.Add(client)
+		client.Listen()
+	}
+	// Disable Origin check. Request don't need to come necessarily from origin.
+	http.HandleFunc(s.pattern, func(w http.ResponseWriter, req *http.Request) {
+		s := ws.Server{Handler: ws.Handler(onConnected)}
+		s.ServeHTTP(w, req)
+	})
+	logger.Debugln("Created handler")
+
+	go s.servHTTP()
+
+	for {
+		select {
+
+		// Add new a client
+		case c := <-s.addCh:
+			s.clients[c.id] = c
+
+		// del a client
+		case c := <-s.delCh:
+			delete(s.clients, c.id)
+
+		case err := <-s.errCh:
+			logger.Debugln("Error:", err.Error())
+
+		case <-s.doneCh:
+			return
+		}
+	}
+}