Mercurial > repos > shellac > sam_consensus_v3
annotate 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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1 """HTTP cache implementation. |
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2 """ |
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3 |
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4 import os |
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5 from contextlib import contextmanager |
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6 |
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7 from pip._vendor.cachecontrol.cache import BaseCache |
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8 from pip._vendor.cachecontrol.caches import FileCache |
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9 from pip._vendor.requests.models import Response |
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10 |
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11 from pip._internal.utils.filesystem import adjacent_tmp_file, replace |
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12 from pip._internal.utils.misc import ensure_dir |
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13 from pip._internal.utils.typing import MYPY_CHECK_RUNNING |
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14 |
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15 if MYPY_CHECK_RUNNING: |
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16 from typing import Iterator, Optional |
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17 |
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18 |
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19 def is_from_cache(response): |
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20 # type: (Response) -> bool |
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21 return getattr(response, "from_cache", False) |
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22 |
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23 |
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24 @contextmanager |
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25 def suppressed_cache_errors(): |
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26 # type: () -> Iterator[None] |
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27 """If we can't access the cache then we can just skip caching and process |
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28 requests as if caching wasn't enabled. |
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29 """ |
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30 try: |
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31 yield |
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32 except OSError: |
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33 pass |
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34 |
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35 |
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36 class SafeFileCache(BaseCache): |
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37 """ |
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38 A file based cache which is safe to use even when the target directory may |
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39 not be accessible or writable. |
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40 """ |
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41 |
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42 def __init__(self, directory): |
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43 # type: (str) -> None |
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44 assert directory is not None, "Cache directory must not be None." |
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45 super().__init__() |
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46 self.directory = directory |
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47 |
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48 def _get_cache_path(self, name): |
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49 # type: (str) -> str |
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50 # From cachecontrol.caches.file_cache.FileCache._fn, brought into our |
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51 # class for backwards-compatibility and to avoid using a non-public |
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52 # method. |
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53 hashed = FileCache.encode(name) |
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54 parts = list(hashed[:5]) + [hashed] |
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55 return os.path.join(self.directory, *parts) |
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56 |
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57 def get(self, key): |
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58 # type: (str) -> Optional[bytes] |
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59 path = self._get_cache_path(key) |
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60 with suppressed_cache_errors(): |
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61 with open(path, 'rb') as f: |
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62 return f.read() |
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63 |
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64 def set(self, key, value): |
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65 # type: (str, bytes) -> None |
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66 path = self._get_cache_path(key) |
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67 with suppressed_cache_errors(): |
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68 ensure_dir(os.path.dirname(path)) |
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69 |
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70 with adjacent_tmp_file(path) as f: |
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71 f.write(value) |
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72 |
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73 replace(f.name, path) |
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74 |
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75 def delete(self, key): |
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76 # type: (str) -> None |
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77 path = self._get_cache_path(key) |
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78 with suppressed_cache_errors(): |
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79 os.remove(path) |