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client.go
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client.go
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// Portions copyright 2013 The Gorilla WebSocket Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package messageServer
import (
"bytes"
"encoding/json"
"github.com/gorilla/websocket"
log2 "github.com/goradd/goradd/pkg/log"
"log"
"net/http"
"time"
)
const (
// Time allowed to write a message to the peer.
writeWait = 2 * time.Second
// Time allowed to read the next pong message from the peer.
pongWait = 60 * time.Second
// Send pings to peer with this period. Must be less than pongWait.
pingPeriod = (pongWait * 9) / 10
// Maximum message size allowed from peer.
maxMessageSize = 512
)
var (
newline = []byte{'\n'}
space = []byte{' '}
)
var upgrader = websocket.Upgrader{
ReadBufferSize: 1024,
WriteBufferSize: 1024,
CheckOrigin:func(r *http.Request) bool {return true},
}
// Client is a middleman between the websocket connection and the hub.
type Client struct {
hub *WebSocketHub
// The websocket connection
conn *websocket.Conn
// Buffered channel of outbound messages.
send chan map[string]interface{}
channel string
pagestate string // authenticator
}
// readPump pumps messages from the websocket connection to the hub.
//
// The application runs readPump in a per-connection goroutine. The application
// ensures that there is at most one reader on a connection by executing all
// reads from this goroutine.
//
// Not currently used
func (c *Client) readPump() {
defer func() {
c.hub.unregister <- c
c.conn.Close()
}()
c.conn.SetReadLimit(maxMessageSize)
c.conn.SetReadDeadline(time.Now().Add(pongWait))
c.conn.SetPongHandler(func(string) error { c.conn.SetReadDeadline(time.Now().Add(pongWait)); return nil })
for {
_, message, err := c.conn.ReadMessage()
if err != nil {
if websocket.IsUnexpectedCloseError(err, websocket.CloseGoingAway) {
log.Printf("error: %v", err)
}
break
}
message = bytes.TrimSpace(bytes.Replace(message, newline, space, -1))
c.handleMessage(message)
}
}
// writePump pumps messages from the hub to the websocket connection.
//
// A goroutine running writePump is started for each connection. The
// application ensures that there is at most one writer to a connection by
// executing all writes from this goroutine.
func (c *Client) writePump() {
ticker := time.NewTicker(pingPeriod)
defer func() {
ticker.Stop()
c.conn.Close()
}()
for {
select {
case message, ok := <-c.send:
c.conn.SetWriteDeadline(time.Now().Add(writeWait))
if !ok {
// The hub closed the channel.
c.conn.WriteMessage(websocket.CloseMessage, []byte{})
return
}
// messages are json objects. We gather them up here into an array.
var messages = []map[string]interface{}{message}
// Add queued messages to the current websocket message.
n := len(c.send)
for i := 0; i < n; i++ {
messages = append(messages, <-c.send)
}
w, err := c.conn.NextWriter(websocket.TextMessage)
if err != nil {
return
}
if buf, err := json.Marshal(messages); err != nil {
panic(err)
} else {
w.Write(buf)
log2.FrameworkDebugf("Writepump %s", string(buf))
}
if err := w.Close(); err != nil {
return
}
case <-ticker.C:
c.conn.SetWriteDeadline(time.Now().Add(writeWait))
if err := c.conn.WriteMessage(websocket.PingMessage, nil); err != nil {
return
}
}
}
}
// serveWs handles new websocket requests from clients.
func serveWs(hub *WebSocketHub, w http.ResponseWriter, r *http.Request) {
conn, err := upgrader.Upgrade(w, r, nil)
if err != nil {
log.Println(err)
return
}
channel := r.FormValue("ch")
pagestate := r.FormValue("id")
client := &Client{hub: hub, conn: conn, send: make(chan map[string]interface{}, 256), channel: channel, pagestate:pagestate}
client.hub.register <- client
// Allow collection of memory referenced by the caller by doing all work in
// new goroutines.
go client.writePump()
go client.readPump()
}
func (c *Client) handleMessage(m []byte) {
}