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# Copyright 2015 gRPC authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""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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