152 lines
4.8 KiB
Python
Executable File
152 lines
4.8 KiB
Python
Executable File
# pyinotifyd is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# pyinotifyd is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with pyinotifyd. If not, see <http://www.gnu.org/licenses/>.
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#
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import asyncio
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import logging
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from shlex import quote as shell_quote
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from uuid import uuid4
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class _Task:
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def __init__(self, event, delay, task_id, task, callback=None,
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logname="task"):
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self._event = event
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self._path = event.pathname
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self._delay = delay
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self._task_id = task_id
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self._job = task
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self._callback = callback
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self._task = None
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self._log = logging.getLogger((logname or __name__))
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async def _start(self):
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if self._delay > 0:
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await asyncio.sleep(self._delay)
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if self._callback is not None:
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self._callback(self._event)
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self._task = None
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self._log.info(f"execute task {self._task_id}")
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await asyncio.shield(self._job(self._event, self._task_id))
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self._log.info(f"task {self._task_id} finished")
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def start(self):
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if self._task is None:
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self._task = asyncio.create_task(self._start())
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def cancel(self):
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if self._task is not None:
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self._task.cancel()
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self._task = None
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def restart(self):
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self.cancel()
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self.start()
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class TaskScheduler:
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def __init__(self, task, files, dirs, delay=0, logname="sched"):
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assert callable(task), \
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f"task: expected callable, got {type(task)}"
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self._task = task
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assert isinstance(delay, int), \
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f"delay: expected {type(int)}, got {type(delay)}"
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self._delay = delay
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assert isinstance(files, bool), \
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f"files: expected {type(bool)}, got {type(files)}"
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self._files = files
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assert isinstance(dirs, bool), \
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f"dirs: expected {type(bool)}, got {type(dirs)}"
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self._dirs = dirs
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self._tasks = {}
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self._logname = (logname or __name__)
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self._log = logging.getLogger(self._logname)
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def _task_started(self, event):
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path = event.pathname
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if path in self._tasks:
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del self._tasks[path]
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def schedule(self, event):
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self._log.debug(f"received {event}")
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if (not event.dir and not self._files) or \
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(event.dir and not self._dirs):
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return
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path = event.pathname
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maskname = event.maskname.split("|", 1)[0]
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if path in self._tasks:
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task = self._tasks[path]
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self._log.info(
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f"received event {maskname} on '{path}', "
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f"re-schedule task {task.task_id} (delay={self._delay}s)")
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task.restart()
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else:
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task_id = str(uuid4())
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self._log.info(
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f"received event {maskname} on '{path}', "
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f"schedule task {task_id} (delay={self._delay}s)")
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task = _Task(
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event, self._delay, task_id, self._task,
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callback=self._task_started, logname=self._logname)
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self._tasks[path] = task
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task.start()
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def cancel(self, event):
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self._log.debug(f"received {event}")
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path = event.pathname
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maskname = event.maskname.split("|", 1)[0]
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if path in self._tasks:
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task = self._tasks[path]
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self._log.info(
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f"received event {maskname} on '{path}', "
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f"cancel scheduled task {task.task_id}")
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task.cancel()
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del self._tasks[path]
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class ShellScheduler(TaskScheduler):
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def __init__(self, cmd, task=None, *args, **kwargs):
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assert isinstance(cmd, str), \
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f"cmd: expected {type('')}, got {type(cmd)}"
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self._cmd = cmd
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super().__init__(*args, task=self.task, **kwargs)
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async def task(self, event, task_id):
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maskname = event.maskname.split("|", 1)[0]
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if hasattr(event, "src_pathname"):
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src_pathname = event.src_pathname
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else:
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src_pathname = ""
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cmd = self._cmd.replace("{maskname}", shell_quote(maskname)).replace(
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"{pathname}", shell_quote(event.pathname)).replace(
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"{src_pathname}", shell_quote(src_pathname))
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self._log.info(f"{task_id}: execute shell command: {cmd}")
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proc = await asyncio.create_subprocess_shell(cmd)
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await proc.communicate()
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