Mailman runner control¶
Mailman has a number of runner subprocesses which perform long-running tasks
such as listening on an LMTP port, processing REST API requests, or processing
messages in a queue directory. In normal operation, the
is used to start, stop and manage the runners. This is just a wrapper around
the real master watcher, which handles runner starting, stopping, exiting, and
log file reopening.
>>> 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 runner that claims to be startable.
>>> from lazr.config import as_boolean >>> startable_runners = [conf for conf in config.runner_configs ... if as_boolean(conf.start)] >>> len(list(master.runner_pids)) == len(startable_runners) True
Now verify that all the runners are running.
>>> import os # This should produce no output. >>> for pid in master.runner_pids: ... os.kill(pid, 0)
Stop the master process, which should also kill (and not restart) the child runner processes.
None of the children are running now.
>>> import errno >>> from contextlib import suppress >>> for pid in master.runner_pids: ... with suppress(ProcessLookupError): ... os.kill(pid, 0) ... print('Process did not exit:', pid)