Merge pull request #5 from fancycode/writepump_ping_goroutine

Writepump optimizations

src/app/spreed-speakfreely-server/connection.go

@@ -153,11 +153,6 @@ func (c *Connection) readAll(dest *bytes.Buffer, r io.Reader) error {
 
 // readPump pumps messages from the websocket connection to the hub.
 func (c *Connection) readPump() {
-	defer func() {
-		c.unregister()
-		c.ws.Close()
-	}()
-
 	c.ws.SetReadLimit(maxMessageSize)
 	c.ws.SetReadDeadline(time.Now().Add(pongWait))
 	c.ws.SetPongHandler(func(string) error {
@@ -198,6 +193,9 @@ func (c *Connection) readPump() {
 			c.h.buffers.Push(message)
 		}
 	}
+
+	c.unregister()
+	c.ws.Close()
 }
 
 // Write message to outbound queue.
@@ -221,24 +219,11 @@ func (c *Connection) send(message []byte) {
 // writePump pumps messages from the queue to the websocket connection.
 func (c *Connection) writePump() {
 
-	closer := make(chan bool)
+	var timer *time.Timer
-	ticker := time.NewTicker(pingPeriod)
 	ping := false
 
-	defer func() {
+	// Spawn a timer to emit websocket pings.
-		//fmt.Println("writePump done")
+	timer = time.AfterFunc(pingPeriod, func() {
-		closer <- true
-		ticker.Stop()
-		c.ws.Close()
-	}()
-
-	// Spawn a new go routine to emit websocket pings.
-	go func() {
-		for {
-			select {
-			case <-closer:
-				return
-			case <-ticker.C:
 		c.mutex.Lock()
 		if c.isClosed {
 			c.mutex.Unlock()
@@ -247,9 +232,8 @@ func (c *Connection) writePump() {
 		ping = true
 		c.condition.Signal()
 		c.mutex.Unlock()
-			}
+		timer.Reset(pingPeriod)
-		}
+	})
-	}()
 
 	// Wait for actions.
 	for {
@@ -263,7 +247,7 @@ func (c *Connection) writePump() {
 		// Fast exit if in closed state.
 		if c.isClosed {
 			c.mutex.Unlock()
-			return
+			goto cleanup
 		}
 		// Flush queue if something.
 		for len(c.queue) > 0 {
@@ -275,14 +259,14 @@ func (c *Connection) writePump() {
 				c.mutex.Unlock()
 				if err := c.ping(); err != nil {
 					log.Println("Error while sending ping", c.Idx, err)
-					return
+					goto cleanup
 				}
 			} else {
 				c.mutex.Unlock()
 			}
 			if err := c.write(websocket.TextMessage, message); err != nil {
 				log.Println("Error while writing", c.Idx, err)
-				return
+				goto cleanup
 			}
 			c.mutex.Lock()
 		}
@@ -292,7 +276,7 @@ func (c *Connection) writePump() {
 			c.mutex.Unlock()
 			if err := c.ping(); err != nil {
 				log.Println("Error while sending ping", c.Idx, err)
-				return
+				goto cleanup
 			}
 		} else {
 			// Final unlock.
@@ -300,6 +284,11 @@ func (c *Connection) writePump() {
 		}
 
 	}
+
+cleanup:
+	//fmt.Println("writePump done")
+	timer.Stop()
+	c.ws.Close()
 }
 
 // Write ping message.