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The C based gRPC (C++, Python, Ruby, Objective-C, PHP, C#)
https://grpc.io/
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63 lines
2.2 KiB
63 lines
2.2 KiB
# Copyright 2015 gRPC authors. |
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# |
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# Licensed under the Apache License, Version 2.0 (the "License"); |
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# you may not use this file except in compliance with the License. |
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# You may obtain a copy of the License at |
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# |
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# http://www.apache.org/licenses/LICENSE-2.0 |
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# |
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# Unless required by applicable law or agreed to in writing, software |
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# distributed under the License is distributed on an "AS IS" BASIS, |
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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# See the License for the specific language governing permissions and |
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# limitations under the License. |
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"""Helper to watch a (set) of directories for modifications.""" |
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import os |
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import time |
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from six import string_types |
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class DirWatcher(object): |
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"""Helper to watch a (set) of directories for modifications.""" |
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def __init__(self, paths): |
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if isinstance(paths, string_types): |
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paths = [paths] |
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self._done = False |
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self.paths = list(paths) |
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self.lastrun = time.time() |
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self._cache = self._calculate() |
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def _calculate(self): |
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"""Walk over all subscribed paths, check most recent mtime.""" |
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most_recent_change = None |
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for path in self.paths: |
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if not os.path.exists(path): |
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continue |
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if not os.path.isdir(path): |
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continue |
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for root, _, files in os.walk(path): |
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for f in files: |
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if f and f[0] == ".": |
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continue |
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try: |
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st = os.stat(os.path.join(root, f)) |
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except OSError as e: |
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if e.errno == os.errno.ENOENT: |
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continue |
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raise |
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if most_recent_change is None: |
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most_recent_change = st.st_mtime |
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else: |
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most_recent_change = max( |
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most_recent_change, st.st_mtime |
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) |
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return most_recent_change |
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def most_recent_change(self): |
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if time.time() - self.lastrun > 1: |
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self._cache = self._calculate() |
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self.lastrun = time.time() |
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return self._cache
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