Mailman queue runner controlΒΆ

Mailman has a number of queue runners which process messages in its queue file directories. In normal operation, the bin/mailman command is used to start, stop and manage the queue runners. This is just a wrapper around the real queue runner watcher script called master.py.

>>> from mailman.testing.helpers import TestableMaster

Start the master in a sub-thread.

>>> master = TestableMaster()
>>> master.start()

There should be a process id for every qrunner that claims to be startable.

>>> from lazr.config import as_boolean
>>> startable_qrunners = [qconf for qconf in config.qrunner_configs
...                       if as_boolean(qconf.start)]
>>> len(list(master.qrunner_pids)) == len(startable_qrunners)
True

Now verify that all the qrunners are running.

>>> import os

# This should produce no output.
>>> for pid in master.qrunner_pids:
...     os.kill(pid, 0)

Stop the master process, which should also kill (and not restart) the child queue runner processes.

>>> master.stop()

None of the children are running now.

>>> import errno
>>> for pid in master.qrunner_pids:
...     try:
...         os.kill(pid, 0)
...         print 'Process did not exit:', pid
...     except OSError, error:
...         if error.errno == errno.ESRCH:
...             # The child process exited.
...             pass
...         else:
...             raise

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