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104 lines
3.3 KiB
104 lines
3.3 KiB
#!/usr/bin/env python
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#
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# Copyright (C) 2016 GNS3 Technologies Inc.
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#
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# This program 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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# This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
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import zlib
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import asyncio
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import os
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class FileWatcher:
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"""
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Watch for file change and call the callback when something happens
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:param paths: A path or a list of file to watch
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:param delay: Delay between file check (seconds)
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:param strategy: File change strategy (mtime: modification time, hash: hash compute)
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"""
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def __init__(self, paths, callback, delay=1, strategy='mtime'):
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self._paths = []
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if not isinstance(paths, list):
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paths = [paths]
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for path in paths:
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if not isinstance(path, str):
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path = str(path)
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self._paths.append(path)
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self._callback = callback
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self._delay = delay
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self._closed = False
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self._strategy = strategy
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if self._strategy == 'mtime':
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# Store modification time
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self._mtime = {}
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for path in self._paths:
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try:
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self._mtime[path] = os.stat(path).st_mtime_ns
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except OSError:
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self._mtime[path] = None
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else:
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# Store hash
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self._hashed = {}
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for path in self._paths:
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try:
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# Alder32 is a fast but insecure hash algorithm
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self._hashed[path] = zlib.adler32(open(path, 'rb').read())
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except OSError:
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self._hashed[path] = None
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asyncio.get_event_loop().call_later(self._delay, self._check_config_file_change)
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def __del__(self):
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self._closed = True
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def close(self):
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self._closed = True
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def _check_config_file_change(self):
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if self._closed:
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return
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changed = False
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for path in self._paths:
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if self._strategy == 'mtime':
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try:
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mtime = os.stat(path).st_mtime_ns
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if mtime != self._mtime[path]:
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changed = True
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self._mtime[path] = mtime
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except OSError:
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self._mtime[path] = None
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else:
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try:
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hashc = zlib.adler32(open(path, 'rb').read())
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if hashc != self._hashed[path]:
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changed = True
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self._hashed[path] = hashc
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except OSError:
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self._hashed[path] = None
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if changed:
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self._callback(path)
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asyncio.get_event_loop().call_later(self._delay, self._check_config_file_change)
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@property
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def callback(self):
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return self._callback
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@callback.setter
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def callback(self, val):
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self._callback = val
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