pulp.plugin.tasks

All models documented here should be imported directly from the pulpcore.plugin.tasking namespace.

class pulpcore.plugin.tasking.WorkingDirectory

RQ Job working directory.

Path format: <worker-dir>/<task-id>

Examples

>>>
>>> with WorkingDirectory() as working_dir:
>>>     # directory created.
>>>     # process CWD = working_dir.path.
>>>     ....
>>> # directory deleted.
>>> # process CWD restored.
>>>

Args: hostname (str): The worker hostname.

pulpcore.plugin.tasking.enqueue_with_reservation(func, resources, args=None, kwargs=None, options=None)

Enqueue a message to Pulp workers with a reservation.

This method provides normal enqueue functionality, while also requesting necessary locks for serialized urls. No two tasks that claim the same resource can execute concurrently. It accepts resources which it transforms into a list of urls (one for each resource).

This does not dispatch the task directly, but instead promises to dispatch it later by encapsulating the desired task through a call to a _queue_reserved_task() task. See the docblock on _queue_reserved_task() for more information on this.

This method creates a pulpcore.app.models.Task object. Pulp expects to poll on a task just after calling this method, so a Task entry needs to exist for it before it returns.

Parameters

  • func (callable) – The function to be run by RQ when the necessary locks are acquired.

  • resources (list) – A list of resources to reserve guaranteeing that only one task reserves these resources. Each resource can be either a (str) resource URL or a (django.models.Model) resource instance.

  • args (tuple) – The positional arguments to pass on to the task.

  • kwargs (dict) – The keyword arguments to pass on to the task.

  • options (dict) – The options to be passed on to the task.

Returns (rq.job.job): An RQ Job instance as returned by RQ’s enqueue function

Raises

ValueError – When resources is an unsupported type.