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# Copyright 2015, Google Inc.
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above
# copyright notice, this list of conditions and the following disclaimer
# in the documentation and/or other materials provided with the
# distribution.
# * Neither the name of Google Inc. nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
"""Helper to watch a (set) of directories for modifications."""
import os
import time
class DirWatcher(object):
"""Helper to watch a (set) of directories for modifications."""
def __init__(self, paths):
if isinstance(paths, basestring):
paths = [paths]
self._done = False
self.paths = list(paths)
self.lastrun = time.time()
self._cache = self._calculate()
def _calculate(self):
"""Walk over all subscribed paths, check most recent mtime."""
most_recent_change = None
for path in self.paths:
if not os.path.exists(path):
continue
if not os.path.isdir(path):
continue
for root, _, files in os.walk(path):
for f in files:
if f and f[0] == '.': continue
try:
st = os.stat(os.path.join(root, f))
except OSError as e:
if e.errno == os.errno.ENOENT:
continue
raise
if most_recent_change is None:
most_recent_change = st.st_mtime
else:
most_recent_change = max(most_recent_change, st.st_mtime)
return most_recent_change
def most_recent_change(self):
if time.time() - self.lastrun > 1:
self._cache = self._calculate()
self.lastrun = time.time()
return self._cache
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