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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 ws
import (
"bytes"
"encoding/json"
log2 "github.com/goradd/goradd/pkg/log"
"github.com/goradd/goradd/pkg/messageServer"
"github.com/gorilla/websocket"
"log"
"net/http"
"net/http/httputil"
"time"
)
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 clientMessage
channels map[string]bool
clientID 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.
//
func (c *Client) readPump() {
defer func() {
c.hub.unregister <- c
c.conn.Close()
}()
c.conn.SetReadLimit(c.hub.MaxMessageSize)
c.conn.SetReadDeadline(time.Now().Add(c.hub.PongWait))
c.conn.SetPongHandler(func(string) error { c.conn.SetReadDeadline(time.Now().Add(c.hub.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)
c.conn.SetReadDeadline(time.Now().Add(c.hub.PongWait)) // extend pong
}
}
// 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(c.hub.PingPeriod)
defer func() {
ticker.Stop()
c.conn.Close()
}()
for {
select {
case message, ok := <-c.send:
c.conn.SetWriteDeadline(time.Now().Add(c.hub.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 = []clientMessage{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, err2 := json.Marshal(messages); err2 != nil {
panic(err2)
} 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(c.hub.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, clientID string) {
conn, err := upgrader.Upgrade(w, r, nil)
if err != nil {
log2.Error(err)
dump,_ := httputil.DumpRequest(r, false)
log2.Errorf("%q", dump)
return
}
client := &Client{hub: hub, conn: conn, send: make(chan clientMessage, 256), channels:make(map[string]bool), clientID: clientID}
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()
}
type inMessage struct {
// Subscribe indicates subscribing to a channel
Subscribe []string `json:"subscribe"`
// Providing a channel will imply you are sending a message to the channel
Channel string `json:"channel"`
Message interface{} `json:"message"`
}
func (c *Client) handleMessage(data []byte) {
var msg inMessage
_ = json.Unmarshal(data, &msg)
if msg.Subscribe != nil {
for _,channel := range msg.Subscribe {
s := subscription{
clientID: c.clientID,
channel: channel,
}
c.hub.subscribe <- s
}
}
if msg.Channel != "" {
messageServer.Send(msg.Channel, msg.Message)
}
}