Delayed message in RabbitMQ

Question

Is it possible to send message via RabbitMQ with some delay? For example I want to expire client session after 30 minutes, and I send a message which will be processed after

Answer 1

AMQP protocol does not support delayed messaging, but by using Time-To-Live and Expiration and Dead Letter Exchanges extensions delayed messaging is possible. The solution is described in this link. I copied the following steps from that link:

Step by step:

Declare the delayed queue
    Add the x-dead-letter-exchange argument property, and set it to the default exchange "".
    Add the x-dead-letter-routing-key argument property, and set it to the name of the destination queue.
    Add the x-message-ttl argument property, and set it to the number of milliseconds you want to delay the message.
Subscribe to the destination queue

There is also a plugin for delayed messaging in RabbitMQ repository on GitHub.

Note that there is a solution called Celery which supports delayed task queuing on RabbitMQ broker by presenting a calling API called apply_async(). Celery supports Python, node and PHP.