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