| # 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 |
| |
