node.js AMQP not returning callback

Question

I am using node AMQP module to connect to RabbitMQ. I am able to connect, create an exchange, queue and able to send/publish the message to the exchange. I can confirm the messages are published on the management console.

Problem is I am not receiving the callback for exchange publish call. This is my code.

Initialization: (app is the express.js instance)

                app.rabbitMQConnection = amqp.createConnection({ host: 'myurl.com', login: 'login', password: 'pwd' });
                app.rabbitMQConnection.on('ready', function(){
                    console.log("RabbitMQ server connected");
                    app.rabbitMQConnection_e = app.rabbitMQConnection.exchange('my-exchange', { confirm: true, durable: true, autoDelete: false }, function (q) {
                        app.rabbitMQConnection_q_lisorders = app.rabbitMQConnection.queue('shoe-orders', {autoDelete: false, durable: true}, function (q) {
                            app.rabbitMQConnection_q_lisorders.bind(app.rabbitMQConnection_e, '#');
                        });
                    });
                });

Then when I need to send a message I use:

                    app.rabbitMQConnection_e.publish('routingKey', { message: myMessage }, {  deliveryMode: 2 }, function(transmissionFailed){
                            if (transmissionFailed == true){ 
                                        console.log("message failed");
                            }else{
                                        console.log("message sent");
                            }
                    });

Callback function(transmissionFailed) is never called. Please help!

IIRC, node-amqp will only call that callback if you enable publish acks in the exchange. — SLaks, Jan 16 '15 at 03:47
@SLaks I have set {confirm: true} option for exchange. Please let me know if thats incorrect — user3658423, Jan 16 '15 at 03:49

score 0 · Answer 1 · answered Feb 10 '15 at 14:59

Doc is not clear enough. As we use it,

when calling: connection.exchange(name, options={}, openCallback)

Then callback has exchange object which is used to publish messages.

Your code would be:

app.rabbitMQConnection.exchange('my-exchange', { confirm: true, durable: true, autoDelete: false }, function (q) {
    app.rabbitMQConnection_e = q;
    .....
});

And then:

app.rabbitMQConnection_e.publish('routingKey', { message: myMessage }, {  deliveryMode: 2 }, function(transmissionFailed){
                        if (transmissionFailed == true){ 
                                    console.log("message failed");
                        }else{
                                    console.log("message sent");
                        }
                });

score 0 · Answer 2 · answered Dec 07 '16 at 12:58

callback is a function that will get called if the exchange is in confirm mode, the value sent will be true or false, this is the presense of a error so true, means an error occured and false, means the publish was successfull

so we should set the exchange as confirm mode when create an exchange

node.js AMQP not returning callback

2 Answers2