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cache.py

"""HTTP cache implementation.
"""

import os
from contextlib import contextmanager
from typing import Iterator, Optional

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

def is_from_cache(response: Response) -> bool:
    return getattr(response, "from_cache", False)

@contextmanager
def suppressed_cache_errors() -> 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: str) -> None:
        assert directory is not None, "Cache directory must not be None."
        super().__init__()
        self.directory = directory

def _get_cache_path(self, name: 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: 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: str, value: 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: str) -> None:
        path = self._get_cache_path(key)
        with suppressed_cache_errors():
            os.remove(path)

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/linksafe	drwxr-xr-x	2024-03-03 10:59:03
..	dir	-	root/linksafe	drwxr-xr-x	2024-03-03 10:59:03
__pycache__	dir	-	root/linksafe	drwxr-xr-x	2024-03-03 10:59:03
__init__.py	text/plain	50 B	root/linksafe	-rw-r--r--	2023-11-13 10:00:31
auth.py	text/plain	11.9 KB	root/linksafe	-rw-r--r--	2023-11-13 10:00:31
cache.py	text/plain	2.05 KB	root/linksafe	-rw-r--r--	2023-11-13 10:00:31
download.py	text/plain	5.88 KB	root/linksafe	-rw-r--r--	2023-11-13 10:00:31
lazy_wheel.py	text/plain	7.45 KB	root/linksafe	-rw-r--r--	2023-11-13 10:00:31
session.py	text/plain	16.34 KB	root/linksafe	-rw-r--r--	2023-11-13 10:00:31
utils.py	text/x-script.python	3.96 KB	root/linksafe	-rw-r--r--	2023-11-13 10:00:31
xmlrpc.py	text/plain	1.75 KB	root/linksafe	-rw-r--r--	2023-11-13 10:00:31