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https://github.com/blakeblackshear/frigate.git
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a468ed316d
* Added stop_event to util.Process util.Process will take care of receiving signals when the stop_event is accessed in the subclass. If it never is, SystemExit is raised instead. This has the effect of still behaving like multiprocessing.Process when stop_event is not accessed, while still allowing subclasses to not deal with the hassle of setting it up. * Give each util.Process their own logger This will help to reduce boilerplate in subclasses. * Give explicit types to util.Process.__init__ This gives better type hinting in the editor. * Use util.Process facilities in AudioProcessor Boilerplate begone! * Removed pointless check in util.Process The log_listener.queue should never be None, unless something has gone extremely wrong in the log setup code. If we're that far gone, crashing is better. * Make sure faulthandler is enabled in all processes This has no effect currently since we're using the fork start_method. However, when we inevidably switch to forkserver (either by choice, or by upgrading to python 3.14+) not having this makes for some really fun failure modes :D
96 lines
2.6 KiB
Python
96 lines
2.6 KiB
Python
import faulthandler
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import logging
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import multiprocessing as mp
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import signal
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import sys
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import threading
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from functools import wraps
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from logging.handlers import QueueHandler
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from typing import Any, Callable, Optional
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import frigate.log
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class BaseProcess(mp.Process):
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def __init__(
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self,
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*,
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name: Optional[str] = None,
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target: Optional[Callable] = None,
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args: tuple = (),
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kwargs: dict = {},
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daemon: Optional[bool] = None,
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):
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super().__init__(
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name=name, target=target, args=args, kwargs=kwargs, daemon=daemon
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)
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def start(self, *args, **kwargs):
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self.before_start()
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super().start(*args, **kwargs)
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self.after_start()
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def __getattribute__(self, name: str) -> Any:
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if name == "run":
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run = super().__getattribute__("run")
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@wraps(run)
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def run_wrapper(*args, **kwargs):
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try:
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self.before_run()
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return run(*args, **kwargs)
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finally:
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self.after_run()
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return run_wrapper
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return super().__getattribute__(name)
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def before_start(self) -> None:
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pass
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def after_start(self) -> None:
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pass
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def before_run(self) -> None:
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pass
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def after_run(self) -> None:
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pass
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class Process(BaseProcess):
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logger: logging.Logger
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@property
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def stop_event(self) -> threading.Event:
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# Lazily create the stop_event. This allows the signal handler to tell if anyone is
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# monitoring the stop event, and to raise a SystemExit if not.
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if "stop_event" not in self.__dict__:
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self.__dict__["stop_event"] = threading.Event()
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return self.__dict__["stop_event"]
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def before_start(self) -> None:
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self.__log_queue = frigate.log.log_listener.queue
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def before_run(self) -> None:
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faulthandler.enable()
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def receiveSignal(signalNumber, frame):
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# Get the stop_event through the dict to bypass lazy initialization.
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stop_event = self.__dict__.get("stop_event")
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if stop_event is not None:
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# Someone is monitoring stop_event. We should set it.
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stop_event.set()
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else:
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# Nobody is monitoring stop_event. We should raise SystemExit.
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sys.exit()
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signal.signal(signal.SIGTERM, receiveSignal)
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signal.signal(signal.SIGINT, receiveSignal)
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self.logger = logging.getLogger(self.name)
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logging.basicConfig(handlers=[], force=True)
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logging.getLogger().addHandler(QueueHandler(self.__log_queue))
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