RabbitMQ Administration Tools
RabbitMQ uses a two-step access-control(https://www.rabbitmq.com/access-control.html). Apart from the standard user/password (or ssl-based) authentication, RabbitMQ has an internal database with the list of users and permissions settings. DIRAC provides an interface to the internal RabbitMQ user database via the RabbitMQAdmin class. Internally it uses rabbitmqctl command (https://www.rabbitmq.com/man/rabbitmqctl.1.man.html) Only the user with the granted permissions can execute those commands. The interface provides methods for adding or removing users, setting the permission etc. The interface do not provide the possibilty to e.g. create or destroy queues, because according to the AMPQ and general RabbitMQ philosophy those operations should be done by consumers/producer with given permissions.
Synchronization of RabbitMQ user database
The synchronization between the DIRAC Configuration System and the RabbitMQ internal database is assured by RabbitMQSynchronizer. It checks the current list of users and hosts which are allowed to send messages to RabbitMQ and updates the internal RabbitMQ database accordingly.