rabbitmq – Retrieve messages from an AMQP/AMQPS RabbitMQ queue

New in version 2.8.

Synopsis

  • This lookup uses a basic get to retrieve all, or a limited number count, messages from a RabbitMQ queue.

Requirements

The below requirements are needed on the local master node that executes this lookup.

Parameters

Parameter Choices/Defaults Configuration Comments
count
-
How many messages to collect from the queue.
If not set, defaults to retrieving all the messages from the queue.
queue
- / required
The queue to get messages from.
url
- / required
An URI connection string to connect to the AMQP/AMQPS RabbitMQ server.
For more information refer to the URI spec https://www.rabbitmq.com/uri-spec.html.

Notes

Note

  • This lookup implements BlockingChannel.basic_get to get messages from a RabbitMQ server.
  • After retrieving a message from the server, receipt of the message is acknowledged and the message on the server is deleted.
  • Pika is a pure-Python implementation of the AMQP 0-9-1 protocol that tries to stay fairly independent of the underlying network support library.
  • More information about pika can be found at https://pika.readthedocs.io/en/stable/.
  • This plugin is tested against RabbitMQ. Other AMQP 0.9.1 protocol based servers may work but not tested/guaranteed.
  • Assigning the return messages to a variable under vars may result in unexpected results as the lookup is evaluated every time the variable is referenced.
  • Currently this plugin only handles text based messages from a queue. Unexpected results may occur when retrieving binary data.

Examples

- name: Get all messages off a queue
  debug:
    msg: "{{ lookup('rabbitmq', url='amqp://guest:[email protected]:5672/%2F', queue='hello') }}"


# If you are intending on using the returned messages as a variable in more than
# one task (eg. debug, template), it is recommended to set_fact.

- name: Get 2 messages off a queue and set a fact for re-use
  set_fact:
    messages: "{{ lookup('rabbitmq', url='amqp://guest:[email protected]:5672/%2F', queue='hello', count=2) }}"

- name: Dump out contents of the messages
  debug:
    var: messages

Return Values

Common return values are documented here, the following are the fields unique to this lookup:

Key Returned Description
_list
list
A list of dictionaries with keys and value from the queue.

  content_type
string
The content_type on the message in the queue.

  delivery_mode
string
The delivery_mode on the message in the queue.

  delivery_tag
string
The delivery_tag on the message in the queue.

  exchange
string
The exchange the message came from.

  headers
dictionary
The headers for the message returned from the queue.

  json
dictionary
If application/json is specified in content_type, json will be loaded into variables.

  message_count
string
The message_count for the message on the queue.

  msg
string
The content of the message.

  redelivered
boolean
The redelivered flag. True if the message has been delivered before.

  routing_key
string
The routing_key on the message in the queue.



Status

Authors

  • John Imison <@Im0>

Hint

If you notice any issues in this documentation, you can edit this document to improve it.

Hint

Configuration entries for each entry type have a low to high priority order. For example, a variable that is lower in the list will override a variable that is higher up.