Esempio n. 1
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// process a message from the SQS queue. This should be run inside a goroutine.
func processMessage(q *sqs.Queue, m sqs.Message, wo work_order.WorkOrder, wg *sync.WaitGroup) {
	logger.Debug("Starting process on %d from '%s'", wo.Id, m.MessageId)

	// start heartbeat
	beat := heartbeat.Start(q, &m)

	// execute the work
	err := wo.Execute()
	if err != nil {
		logger.Error("Error executing: %d - %v", wo.Id, err)
	}

	// send response back to devops-web
	wo.Report()

	// stop the heartbeat
	beat.Stop()

	// delete message
	logger.Debug("Deleting message: %s", m.MessageId)
	_, err = q.DeleteMessage(&m)
	if err != nil {
		logger.Error("ERROR: Couldn't delete message: %s - %v", m.MessageId, err)
	}

	// exit this goroutine
	wg.Done()
}
Esempio n. 2
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// Send a heartbeat to SQS notifying it that we are still working on the message.
func (heartbeat *Heartbeat) beat(t time.Time) {
	logger.Debug("Sending heartbeat for: %s", heartbeat.Message.MessageId)

	// change the sqs message visibility
	_, err := heartbeat.Queue.ChangeMessageVisibility(heartbeat.Message, 2*60)
	if err != nil {
		logger.Error("HEARTBEAT ERROR: messageId: %s - %v", heartbeat.Message.MessageId, err)
	}
}
Esempio n. 3
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// Start a heartbeat against a given queue and message
func Start(q *sqs.Queue, m *sqs.Message) (heartbeat Heartbeat) {
	logger.Debug("Starting heartbeat on: %s", m.MessageId)

	heartbeat.ticker = time.NewTicker(50 * time.Second)
	heartbeat.Message = m
	heartbeat.Queue = q

	// start a goroutine to send updates to SQS letting them know we are still processing the message
	// this will end after the ticker is Stop'ed
	go func() {
		for t := range heartbeat.ticker.C {
			// update SQS with each tick from the heartbeat
			heartbeat.beat(t)
		}
	}()

	return
}
Esempio n. 4
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// Stop the heartbeat
func (heartbeat *Heartbeat) Stop() {
	logger.Debug("Stopping heartbeat on: %s", heartbeat.Message.MessageId)
	heartbeat.ticker.Stop()
}
Esempio n. 5
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func main() {
	logger.Info("Starting worker v%s", VERSION)

	// get worker count
	workers, err := strconv.Atoi(os.Getenv("WORKER_COUNT"))
	if err != nil {
		workers = 10
	}
	logger.Info("Worker count: %d", workers)

	// access key, secret key, receive queue and report queue should be in ENV variables
	logger.Info("SQS queue: %s", os.Getenv("SQS_WORKER_QUEUE"))

	// create sqs client
	client, err := sqs.NewFrom(os.Getenv("SQS_WORKER_ACCESS_KEY"), os.Getenv("SQS_WORKER_SECRET_KEY"), "us-east-1")
	if err != nil {
		logger.Fatal("CLIENT ERROR: %v", err)
	}

	// get the SQS queue
	queue, err := client.GetQueue(os.Getenv("SQS_WORKER_QUEUE"))
	if err != nil {
		logger.Fatal("QUEUE ERROR: %v", err)
	}

	logger.Info("Worker started.")

	// create the wait group
	var wg sync.WaitGroup

	for {
		// get some messages from the sqs queue
		logger.Debug("Checking for messages on the queue...")
		resp, err := queue.ReceiveMessageWithVisibilityTimeout(workers, 60)
		if err != nil {
			logger.Error("Could not receive messages: %v", err)
			time.Sleep(10 * time.Second)
		}

		if cap(resp.Messages) == 0 {
			logger.Debug("Did not find any messages on the queue.")
		}

		// for each message
		for _, message := range resp.Messages {
			// get the message details
			wo, err := work_order.NewFromJson(message.Body)
			if err != nil {
				logger.Error("Could not process SQS message: %s with JSON ERROR: %v", message.MessageId, err)
			} else {
				// process the message in a goroutine
				wg.Add(1)
				go processMessage(queue, message, wo, &wg)
			}
		}

		// wait for each goroutine to exit
		wg.Wait()
	}

}