AMQP: use separate send and recv channels

routes/infrastructure-component/ic_amqpclient.go

@@ -37,8 +37,8 @@ const VILLAS_EXCHANGE = "villas"
 
 type AMQPclient struct {
 	connection *amqp.Connection
-	channel    *amqp.Channel
-	replies    <-chan amqp.Delivery
+	sendCh     *amqp.Channel
+	recvCh     *amqp.Channel
 }
 
 type Action struct {
@@ -94,13 +94,13 @@ func ConnectAMQP(uri string) error {
 		return fmt.Errorf("AMQP: failed to connect to RabbitMQ broker %v, error: %v", uri, err)
 	}
 
-	// create channel
-	client.channel, err = client.connection.Channel()
+	// create sendCh
+	client.sendCh, err = client.connection.Channel()
 	if err != nil {
-		return fmt.Errorf("AMQP: failed to open a channel, error: %v", err)
+		return fmt.Errorf("AMQP: failed to open a sendCh, error: %v", err)
 	}
 	// declare exchange
-	err = client.channel.ExchangeDeclare(VILLAS_EXCHANGE,
+	err = client.sendCh.ExchangeDeclare(VILLAS_EXCHANGE,
 		"headers",
 		true,
 		false,
@@ -112,7 +112,7 @@ func ConnectAMQP(uri string) error {
 	}
 
 	// add a queue for the ICs
-	ICQueue, err := client.channel.QueueDeclare("infrastructure_components",
+	ICQueue, err := client.sendCh.QueueDeclare("infrastructure_components",
 		true,
 		false,
 		false,
@@ -122,13 +122,19 @@ func ConnectAMQP(uri string) error {
 		return fmt.Errorf("AMQP: failed to declare the queue, error: %v", err)
 	}
 
-	err = client.channel.QueueBind(ICQueue.Name, "", VILLAS_EXCHANGE, false, nil)
+	err = client.sendCh.QueueBind(ICQueue.Name, "", VILLAS_EXCHANGE, false, nil)
 	if err != nil {
 		return fmt.Errorf("AMQP: failed to bind the queue, error: %v", err)
 	}
 
-	// consume deliveries
-	client.replies, err = client.channel.Consume(ICQueue.Name,
+	// create receive channel
+	client.recvCh, err = client.connection.Channel()
+	if err != nil {
+		return fmt.Errorf("AMQP: failed to open a recvCh, error: %v", err)
+	}
+
+	// start deliveries
+	messages, err := client.recvCh.Consume(ICQueue.Name,
 		"",
 		true,
 		false,
@@ -136,19 +142,18 @@ func ConnectAMQP(uri string) error {
 		false,
 		nil)
 	if err != nil {
-		return fmt.Errorf("AMQP: failed to consume deliveries, error: %v", err)
+		return fmt.Errorf("AMQP: failed to start deliveries: %v", err)
 	}
 
-	// consuming queue
+	// consume deliveries
 	go func() {
 		for {
-			for message := range client.replies {
+			for message := range messages {
 				err = processMessage(message)
 				if err != nil {
-					log.Println(err.Error())
+					log.Println("AMQP: Error processing message: ", message, err.Error())
 				}
 			}
-			time.Sleep(2) // sleep for 2 sek
 		}
 	}()
 
@@ -193,7 +198,7 @@ func sendActionAMQP(action Action) error {
 	}
 
 	//log.Println("AMQP: Sending message", string(msg.Body))
-	err = client.channel.Publish(VILLAS_EXCHANGE,
+	err = client.sendCh.Publish(VILLAS_EXCHANGE,
 		"",
 		false,
 		false,