Revision 9b739173 lib/daemon.py
b/lib/daemon.py | ||
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44 | 44 |
self._signal_wait = [] |
45 | 45 |
self._poller = select.poll() |
46 | 46 |
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def Run(self, handle_sigchld=True, handle_sigterm=True, stop_on_empty=False): |
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@utils.SignalHandled([signal.SIGCHLD]) |
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@utils.SignalHandled([signal.SIGTERM]) |
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def Run(self, stop_on_empty=False, signal_handlers=None): |
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48 | 50 |
"""Runs the mainloop. |
49 | 51 |
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@type handle_sigchld: bool |
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@param handle_sigchld: Whether to install handler for SIGCHLD |
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@type handle_sigterm: bool |
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@param handle_sigterm: Whether to install handler for SIGTERM |
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54 | 52 |
@type stop_on_empty: bool |
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@param stop_on_empty: Whether to stop mainloop once all I/O waiters |
56 | 54 |
unregistered |
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@type signal_handlers: dict |
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@param signal_handlers: signal->L{utils.SignalHandler} passed by decorator |
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""" |
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# Setup signal handlers
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if handle_sigchld:
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sigchld_handler = utils.SignalHandler([signal.SIGCHLD])
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else:
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sigchld_handler = None
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try:
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if handle_sigterm:
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sigterm_handler = utils.SignalHandler([signal.SIGTERM])
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else:
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sigterm_handler = None |
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assert isinstance(signal_handlers, dict) and \
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len(signal_handlers) > 0, \
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"Broken SignalHandled decorator"
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running = True
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# Start actual main loop
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while running:
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# Stop if nothing is listening anymore
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if stop_on_empty and not (self._io_wait):
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break
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# Wait for I/O events |
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try: |
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running = True |
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|
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# Start actual main loop |
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while running: |
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# Stop if nothing is listening anymore |
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if stop_on_empty and not (self._io_wait): |
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break |
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|
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# Wait for I/O events |
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try: |
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io_events = self._poller.poll(None) |
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except select.error, err: |
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# EINTR can happen when signals are sent |
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if err.args and err.args[0] in (errno.EINTR,): |
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io_events = None |
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else: |
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raise |
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if io_events: |
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# Check for I/O events |
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for (evfd, evcond) in io_events: |
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owner = self._io_wait.get(evfd, None) |
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if owner: |
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owner.OnIO(evfd, evcond) |
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|
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# Check whether signal was raised |
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if sigchld_handler and sigchld_handler.called: |
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self._CallSignalWaiters(signal.SIGCHLD) |
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sigchld_handler.Clear() |
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if sigterm_handler and sigterm_handler.called: |
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self._CallSignalWaiters(signal.SIGTERM) |
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running = False |
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sigterm_handler.Clear() |
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finally: |
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# Restore signal handlers |
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if sigterm_handler: |
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sigterm_handler.Reset() |
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finally: |
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if sigchld_handler: |
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sigchld_handler.Reset() |
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io_events = self._poller.poll(None) |
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except select.error, err: |
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# EINTR can happen when signals are sent |
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if err.args and err.args[0] in (errno.EINTR,): |
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io_events = None |
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else: |
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raise |
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if io_events: |
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# Check for I/O events |
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for (evfd, evcond) in io_events: |
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owner = self._io_wait.get(evfd, None) |
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if owner: |
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owner.OnIO(evfd, evcond) |
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|
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# Check whether a signal was raised |
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for sig in signal_handlers: |
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handler = signal_handlers[sig] |
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if handler.called: |
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self._CallSignalWaiters(sig) |
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running = (sig != signal.SIGTERM) |
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handler.Clear() |
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def _CallSignalWaiters(self, signum): |
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"""Calls all signal waiters for a certain signal. |
Also available in: Unified diff