实时视频返回版本2

handler/device.go

@@ -229,7 +229,69 @@ func GetRealTimeImage(c *gin.Context) {
 	}
 	worker.SetRedisWithExpire(strconv.Itoa(int(device.ID))+"_is_play", "1", time.Minute*5)
 	fmt.Println("device_id:", device_id_int, " has set is_play to 1")
-	go subscribeAndHandleMessages(ws, device_id_int)
+	go subscribeAndHandleMessagesV2(ws, device_id_int)
+}
+
+func subscribeAndHandleMessagesV2(ws *websocket.Conn, device_id int) {
+	ctx := context.Background()
+	pubsub := worker.RedisClient.Subscribe(ctx, strconv.Itoa(device_id)+"_frames_msgs")
+	// 生成唯一连接 uuid
+	con_id := uuid.New().String()
+	online_conn_key := "device_" + strconv.Itoa(device_id) + "_online_conn_ids"
+	// 加入设备在线连接集合
+	worker.SetRedisSetAddWithExpire(online_conn_key, con_id, time.Minute*5)
+	defer pubsub.Close()
+	defer ws.Close()
+	ch := pubsub.Channel()
+	var ticker *time.Ticker
+	for {
+		select {
+		case msg, _ := <-ch:
+			frame := ""
+			if msg.Payload != "" {
+				frame = msg.Payload
+			}
+			//将base64图片数据解析为图片
+			buf, err := base64.StdEncoding.DecodeString(frame)
+			if err != nil {
+				fmt.Println("base64 decode error:", err)
+				continue
+			}
+
+			err2 := ws.WriteMessage(websocket.BinaryMessage, buf)
+			if err2 != nil {
+				clientsMux.Lock()
+				clients[ws] = false
+				clientsMux.Unlock()
+				fmt.Println("send message to client err:", err2)
+				worker.SetRedisSetRemove(online_conn_key, con_id)
+				goto end
+			}
+		default:
+			if ticker == nil {
+				ticker = time.NewTicker(time.Second)
+			}
+			select {
+			case <-ticker.C:
+				err := ws.WriteControl(websocket.PingMessage, []byte{}, time.Now().Add(time.Second))
+				if err != nil {
+					fmt.Println("Connection check failed:", err)
+					worker.SetRedisSetRemove(online_conn_key, con_id)
+					goto end
+				}
+			default:
+				continue
+			}
+		}
+	}
+
+end:
+	// 查看是否还有其他连接，没有则设置 is_play 为 0
+	if worker.IsContainKey(online_conn_key) == false {
+		worker.SetRedisWithExpire(strconv.Itoa(device_id)+"_is_play", "0", time.Minute*5)
+		fmt.Println("device_id:", device_id, " has set is_play to 0")
+	}
+
 }
 
 func subscribeAndHandleMessages(ws *websocket.Conn, device_id int) {