102 lines
2.6 KiB
Python
102 lines
2.6 KiB
Python
import logging
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import os
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import signal
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import sys
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from threading import Thread
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from typing import Optional
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from platypush.cli import parse_cmdline
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from platypush.commands import CommandStream
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from ._app import ApplicationProcess
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class ApplicationRunner:
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"""
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Runner for the main application.
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It wraps the main application and provides an interface to control it
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externally.
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"""
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_default_timeout = 0.5
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def __init__(self):
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logging.basicConfig(level=logging.INFO, stream=sys.stdout)
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self.logger = logging.getLogger('platypush:runner')
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self._proc: Optional[ApplicationProcess] = None
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self._stream: Optional[CommandStream] = None
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def _listen(self, stream: CommandStream):
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"""
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Listens for external application commands and executes them.
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"""
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while self.is_running:
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cmd = stream.read(timeout=self._default_timeout)
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if not cmd:
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continue
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self.logger.info(cmd)
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Thread(target=cmd, args=(self,)).start()
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def _print_version(self):
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from platypush import __version__
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print(__version__)
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sys.exit(0)
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def _run(self, *args: str) -> None:
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parsed_args = parse_cmdline(args)
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if parsed_args.version:
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self._print_version()
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signal.signal(signal.SIGTERM, lambda *_: self.stop())
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while True:
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with CommandStream(
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parsed_args.ctrl_sock
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) as self._stream, ApplicationProcess(
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*args, pidfile=parsed_args.pidfile, timeout=self._default_timeout
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) as self._proc:
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try:
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self._listen(self._stream)
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except KeyboardInterrupt:
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pass
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if self.should_restart:
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self.logger.info('Restarting application...')
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continue
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break
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self._stream = None
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def run(self, *args: str) -> None:
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try:
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self._run(*args)
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finally:
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self._proc = None
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def stop(self):
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if self._proc is not None:
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self._proc.stop()
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if self._stream and self._stream.pid:
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os.kill(self._stream.pid, signal.SIGKILL)
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self._stream = None
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def restart(self):
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if self._proc is not None:
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self._proc.mark_for_restart()
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self.stop()
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@property
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def is_running(self) -> bool:
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return bool(self._proc and self._proc.is_alive())
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@property
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def should_restart(self) -> bool:
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return self._proc.should_restart if self._proc is not None else False
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