Mercurial > repos > shellac > sam_consensus_v3
view env/lib/python3.9/site-packages/pip/_internal/network/cache.py @ 0:4f3585e2f14b draft default tip
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
author | shellac |
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date | Mon, 22 Mar 2021 18:12:50 +0000 |
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"""HTTP cache implementation. """ import os from contextlib import contextmanager from pip._vendor.cachecontrol.cache import BaseCache from pip._vendor.cachecontrol.caches import FileCache from pip._vendor.requests.models import Response from pip._internal.utils.filesystem import adjacent_tmp_file, replace from pip._internal.utils.misc import ensure_dir from pip._internal.utils.typing import MYPY_CHECK_RUNNING if MYPY_CHECK_RUNNING: from typing import Iterator, Optional def is_from_cache(response): # type: (Response) -> bool return getattr(response, "from_cache", False) @contextmanager def suppressed_cache_errors(): # type: () -> Iterator[None] """If we can't access the cache then we can just skip caching and process requests as if caching wasn't enabled. """ try: yield except OSError: pass class SafeFileCache(BaseCache): """ A file based cache which is safe to use even when the target directory may not be accessible or writable. """ def __init__(self, directory): # type: (str) -> None assert directory is not None, "Cache directory must not be None." super().__init__() self.directory = directory def _get_cache_path(self, name): # type: (str) -> str # From cachecontrol.caches.file_cache.FileCache._fn, brought into our # class for backwards-compatibility and to avoid using a non-public # method. hashed = FileCache.encode(name) parts = list(hashed[:5]) + [hashed] return os.path.join(self.directory, *parts) def get(self, key): # type: (str) -> Optional[bytes] path = self._get_cache_path(key) with suppressed_cache_errors(): with open(path, 'rb') as f: return f.read() def set(self, key, value): # type: (str, bytes) -> None path = self._get_cache_path(key) with suppressed_cache_errors(): ensure_dir(os.path.dirname(path)) with adjacent_tmp_file(path) as f: f.write(value) replace(f.name, path) def delete(self, key): # type: (str) -> None path = self._get_cache_path(key) with suppressed_cache_errors(): os.remove(path)