Exemplo n.º 1
0
func main() {
	s := sseserver.NewServer() // create a server instance

	// broadcast the time every second to the "/time" namespace
	go func() {
		ticker := time.Tick(time.Duration(1 * time.Second))
		for {
			// wait for the ticker to fire
			t := <-ticker
			// create the message payload, can be any []byte value
			data := []byte(t.Format("3:04:05 pm (MST)"))
			// send a message without an event on the "/time" namespace
			s.Broadcast <- sseserver.SSEMessage{"", data, "/time"}
		}
	}()

	// simulate sending some scoped events on the "/pets" namespace
	go func() {
		time.Sleep(time.Duration(5 * time.Second))
		s.Broadcast <- sseserver.SSEMessage{"new-dog", []byte("Corgi"), "/pets"}
		s.Broadcast <- sseserver.SSEMessage{"new-cat", []byte("Persian"), "/pets"}
		time.Sleep(time.Duration(1 * time.Second))
		s.Broadcast <- sseserver.SSEMessage{"new-dog", []byte("Terrier"), "/pets"}
		s.Broadcast <- sseserver.SSEMessage{"new-dog", []byte("Dauchsand"), "/pets"}
		time.Sleep(time.Duration(2 * time.Second))
		s.Broadcast <- sseserver.SSEMessage{"new-cat", []byte("LOLcat"), "/pets"}
	}()

	s.Serve(":8001") // bind to port and beging serving connections
}
Exemplo n.º 2
0
func main() {
	// set up SSE server interface
	s := sseserver.NewServer()
	clients := s.Broadcast

	// get us some data from redis
	log.Println("Connecting to Redis...")
	initRedisPool()
	scoreUpdates, detailUpdates := myRedisSubscriptions()

	// fanout the scoreUpdates to two destinations
	rawScoreUpdates := make(chan RedisMsg)
	epsfeeder := make(chan RedisMsg)
	go func() {
		for scoreUpdate := range scoreUpdates {
			rawScoreUpdates <- scoreUpdate
			epsfeeder <- scoreUpdate
		}
	}()

	// Handle packing scores for eps namespace.
	//
	// This first goroutine basically grabs just the data field of a Redis msg,
	// and converts it to a string, because that's what my generic scorepacker
	// function expects to receive.
	//
	// Then, we just pipe that chan into a ScorePacker.
	scoreVals := make(chan string)
	epsScoreUpdates := ScorePacker(scoreVals, time.Duration(17*time.Millisecond))
	go func() {
		for {
			scoreVals <- string((<-epsfeeder).data)
		}
	}()

	// goroutines to handle passing messages to the proper connection pool.
	//
	// I could use a select here and do as one goroutine, but having each be
	// independent could be slightly better for concurrency as these actually do
	// have a small amount of overhead in creating the SSEMessage so this is
	// theoretically better if we are running in parallel on appropriate hardware.

	// rawPublisher
	go func() {
		for msg := range rawScoreUpdates {
			clients <- sseserver.SSEMessage{
				Event:     "",
				Data:      msg.data,
				Namespace: "/raw",
			}
		}
	}()

	// epsPublisher
	go func() {
		for val := range epsScoreUpdates {
			clients <- sseserver.SSEMessage{
				Event:     "",
				Data:      val,
				Namespace: "/eps",
			}
		}
	}()

	// detailPublisher
	go func() {
		for msg := range detailUpdates {
			dchan := "/details/" + strings.Split(msg.channel, ".")[2]

			clients <- sseserver.SSEMessage{
				Event:     msg.channel,
				Data:      msg.data,
				Namespace: dchan,
			}
		}
	}()

	// start the monitor reporter to periodically send our status to redis
	go adminReporter(s)
	gorelicMonitor()

	// share and enjoy
	port := envPort()
	log.Println("Starting server on port " + port)
	log.Println("HOLD ON TO YOUR BUTTS...")

	// this method blocks by design
	s.Serve(port)
}