114 lines
2.9 KiB
Python
114 lines
2.9 KiB
Python
import os
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import sys
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import time
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import signal
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import threading
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import atexit
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import Queue
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_interval = 1.0
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_times = {}
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_files = []
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_running = False
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_queue = Queue.Queue()
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_lock = threading.Lock()
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def _restart(path):
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_queue.put(True)
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prefix = 'monitor (pid=%d):' % os.getpid()
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print >> sys.stderr, '%s Change detected to \'%s\'.' % (prefix, path)
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print >> sys.stderr, '%s Triggering process restart.' % prefix
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os.kill(os.getpid(), signal.SIGINT)
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def _modified(path):
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try:
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# If path doesn't denote a file and were previously
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# tracking it, then it has been removed or the file type
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# has changed so force a restart. If not previously
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# tracking the file then we can ignore it as probably
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# pseudo reference such as when file extracted from a
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# collection of modules contained in a zip file.
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if not os.path.isfile(path):
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return path in _times
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# Check for when file last modified.
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mtime = os.stat(path).st_mtime
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if path not in _times:
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_times[path] = mtime
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# Force restart when modification time has changed, even
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# if time now older, as that could indicate older file
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# has been restored.
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if mtime != _times[path]:
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return True
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except:
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# If any exception occured, likely that file has been
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# been removed just before stat(), so force a restart.
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return True
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return False
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def _monitor():
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while 1:
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# Check modification times on all files in sys.modules.
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for module in sys.modules.values():
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if not hasattr(module, '__file__'):
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continue
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path = getattr(module, '__file__')
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if not path:
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continue
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if os.path.splitext(path)[1] in ['.pyc', '.pyo', '.pyd']:
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path = path[:-1]
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if _modified(path):
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return _restart(path)
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# Check modification times on files which have
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# specifically been registered for monitoring.
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for path in _files:
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if _modified(path):
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return _restart(path)
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# Go to sleep for specified interval.
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try:
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return _queue.get(timeout=_interval)
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except:
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pass
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_thread = threading.Thread(target=_monitor)
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_thread.setDaemon(True)
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def _exiting():
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try:
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_queue.put(True)
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except:
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pass
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_thread.join()
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atexit.register(_exiting)
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def track(path):
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if not path in _files:
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_files.append(path)
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def start(interval=1.0):
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global _interval
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if interval < _interval:
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_interval = interval
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global _running
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_lock.acquire()
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if not _running:
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prefix = 'monitor (pid=%d):' % os.getpid()
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print >> sys.stderr, '%s Starting change monitor.' % prefix
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_running = True
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_thread.start()
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_lock.release()
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