racecar_analytics websocket endpoints

api.go

func StartServer() {
	r := gin.Default()
	r.GET("/ecu", GetAllECUs)
	r.GET("/battery", GetAllBatteries)
	r.GET("/ecu/averages", GetECUAverages)
	r.GET("/battery/averages", GetBatteryAverages)
	r.GET("/ecu/stream", StreamECUs)		// add this
	r.GET("/battery/stream", StreamBatteries)	// add this
	r.Run(":" + Port)
}

// other functions here

var upgrader = websocket.Upgrader{
	ReadBufferSize:  1024,
	WriteBufferSize: 1024,
	CheckOrigin: func(r *http.Request) bool {
		return true
	},
}

func StreamECUs(c *gin.Context) {
	conn, err := upgrader.Upgrade(c.Writer, c.Request, nil)
	if err != nil {
		log.Println(err)
		return
	}
	defer conn.Close()

	RegisterECUCallback(func(ecu ECU) {
		conn.WriteJSON(ecu)
	})

	for {
		_, p, _ := conn.ReadMessage()
		log.Println(string(p))
	}
}

func StreamBatteries(c *gin.Context) {
	conn, err := upgrader.Upgrade(c.Writer, c.Request, nil)
	if err != nil {
		log.Println(err)
		return
	}
	defer conn.Close()

	RegisterBatteryCallback(func(battery Battery) {
		conn.WriteJSON(battery)
	})

	for {
		_, p, _ := conn.ReadMessage()
		log.Println(string(p))
	}
}