Example #1
0
// NewChord creates Chord instance
func NewChord(group *Group, callback *signatures.TaskSignature) *Chord {
	// Generate a UUID for the chord callback
	callback.UUID = fmt.Sprintf("chord_%v", uuid.New())

	// Add a chord callback to all tasks
	for _, task := range group.Tasks {
		task.ChordCallback = callback
	}

	return &Chord{Group: group, Callback: callback}
}
Example #2
0
// Publish places a new message on the default queue
func (amqpBroker *AMQPBroker) Publish(signature *signatures.TaskSignature) error {
	_, channel, _, confirmsChan, err := amqpBroker.open()
	defer channel.Close()
	if err != nil {
		return err
	}

	message, err := json.Marshal(signature)
	if err != nil {
		return fmt.Errorf("JSON Encode Message: %v", err)
	}

	signature.AdjustRoutingKey(
		amqpBroker.config.ExchangeType,
		amqpBroker.config.BindingKey,
		amqpBroker.config.DefaultQueue,
	)
	if err := channel.Publish(
		amqpBroker.config.Exchange, // exchange
		signature.RoutingKey,       // routing key
		false,                      // mandatory
		false,                      // immediate
		amqp.Publishing{
			ContentType:  "application/json",
			Body:         message,
			DeliveryMode: amqp.Persistent,
		},
	); err != nil {
		return err
	}

	confirmed := <-confirmsChan

	if confirmed.Ack {
		return nil
	}

	return fmt.Errorf("Failed delivery of delivery tag: %v", confirmed.DeliveryTag)
}
Example #3
0
// SendTask publishes a task to the default queue
func (server *Server) SendTask(signature *signatures.TaskSignature) (*backends.AsyncResult, error) {
	// Make sure result backend is defined
	if server.backend == nil {
		return nil, errors.New("Result backend required")
	}

	// Auto generate a UUID if not set already
	if signature.UUID == "" {
		signature.UUID = fmt.Sprintf("task_%v", uuid.New())
	}

	// Set initial task state to PENDING
	if err := server.backend.SetStatePending(signature); err != nil {
		return nil, fmt.Errorf("Set State Pending: %v", err)
	}

	if err := server.broker.Publish(signature); err != nil {
		return nil, fmt.Errorf("Publish Message: %v", err)
	}

	return backends.NewAsyncResult(signature, server.backend), nil
}