rabbitmq-server/deps/rabbitmq_event_exchange

RabbitMQ Event Exchange

Overview

This plugin exposes the internal RabbitMQ event mechanism as messages that clients can consume. It's useful if you want to keep track of certain events, e.g. when queues, exchanges, bindings, users, connections, channels are created and deleted. This plugin filters out stats events, so you are almost certainly going to get better results using the management plugin for stats.

How it Works

It declares a topic exchange called 'amq.rabbitmq.event' in the default virtual host. All events are published to this exchange with routing keys like 'exchange.created', 'binding.deleted' etc, so you can subscribe to only the events you're interested in.

The exchange behaves similarly to 'amq.rabbitmq.log': everything gets published there; if you don't trust a user with the information that gets published, don't allow them access.

Installation

With RabbitMQ 3.6.0 or Later

Most recent RabbitMQ version ships with this plugin. As of RabbitMQ 3.6.0 this plugin is included into the RabbitMQ distribution.

Enable it with the following command:

rabbitmq-plugins enable rabbitmq_event_exchange

With RabbitMQ 3.5.x

You can download a pre-built binary of this plugin from the RabbitMQ Community Plugins page.

Then run the following command:

rabbitmq-plugins enable rabbitmq_event_exchange

Event format

Each event has various properties associated with it. These are translated into AMQP 0-9-1 data encoding and inserted in the message headers. The message body is always blank.

Events

So far RabbitMQ and related plugins emit events with the following routing keys:

RabbitMQ Broker

Queue, Exchange and Binding events:

• queue.deleted
• queue.created
• exchange.created
• exchange.deleted
• binding.created
• binding.deleted

Connection and Channel events:

• connection.created
• connection.closed
• channel.created
• channel.closed

Consumer events:

• consumer.created
• consumer.deleted

Policy and Parameter events:

• policy.set
• policy.cleared
• parameter.set
• parameter.cleared

Virtual host events:

• vhost.created
• vhost.deleted
• vhost.limits.set
• vhost.limits.cleared

User related events:

• user.authentication.success
• user.authentication.failure
• user.created
• user.deleted
• user.password.changed
• user.password.cleared
• user.tags.set

Permission events:

• permission.created
• permission.deleted
• topic.permission.created
• topic.permission.deleted

Alarm events:

• alarm.set
• alarm.cleared

Shovel Plugin

Worker events:

• shovel.worker.status
• shovel.worker.removed

Federation Plugin

Link events:

• federation.link.status
• federation.link.removed

Example

There is a usage example using the Java client in examples/java.

Configuration

• rabbitmq_event_exchange.vhost: what vhost should the amq.rabbitmq.event exchange be declared in. Default: rabbit.default_vhost (<<"/">>).

Uninstalling

If you want to remove the exchange which this plugin creates, first disable the plugin and restart the broker. Then you can delete the exchange, e.g. with :

rabbitmqctl eval 'rabbit_exchange:delete(rabbit_misc:r(<<"/">>, exchange, <<"amq.rabbitmq.event">>), false, <<"username">>).'

Building from Source

Building is no different from building other RabbitMQ plugins.

TL;DR:

git clone https://github.com.com/rabbitmq/rabbitmq-public-umbrella.git umbrella
cd umbrella
make co
make up BRANCH=stable
cd deps
git clone https://github.com/rabbitmq/rabbitmq-event-exchange.git rabbitmq_event_exchange
cd rabbitmq_event_exchange
make dist

License

Released under the Mozilla Public License 2.0, the same as RabbitMQ.