U
��.e� � @ s� d Z ddlZddlmZ ddlmZ ddlmZ ddlm Z m
Z
ddl m Z ddl
mZ erhdd lmZ ed
d � �ZG d d
� d
e�ZdS )zHTTP cache implementation.
� N)�contextmanager)� BaseCache)� FileCache)�adjacent_tmp_file�replace)�
ensure_dir)�MYPY_CHECK_RUNNING)�Optionalc c s( z
dV W n t tfk
r" Y nX dS )zvIf we can't access the cache then we can just skip caching and process
requests as if caching wasn't enabled.
N)�OSError�IOError� r r �?/usr/lib/python3.8/site-packages/pip/_internal/network/cache.py�suppressed_cache_errors s
r c s@ e Zd ZdZ� fdd�Zdd� Zdd� Zdd � Zd
d � Z� Z S ) �
SafeFileCachezw
A file based cache which is safe to use even when the target directory may
not be accessible or writable.
c s( |d k st d��tt| ��� || _d S )Nz!Cache directory must not be None.)�AssertionError�superr �__init__� directory)�selfr �� __class__r r
r & s zSafeFileCache.__init__c C s4 t �|�}t|d d� �|g }tjj| jf|�� S )N� )r �encode�list�os�path�joinr )r �nameZhashed�partsr r r
�_get_cache_path, s
z SafeFileCache._get_cache_pathc C sR | � |�}t� �8 t|d��"}|�� W 5 Q R � W 5 Q R � S Q R X W 5 Q R X d S )N�rb)r r �open�read)r �keyr �fr r r
�get5 s
zSafeFileCache.getc
C sZ | � |�}t� �@ ttj�|�� t|��}|�|� W 5 Q R X t|j |� W 5 Q R X d S �N)
r r r r r �dirnamer �writer r )r r# �valuer r$ r r r
�set< s
zSafeFileCache.setc C s* | � |�}t� � t�|� W 5 Q R X d S r& )r r r �remove)r r# r r r r
�deleteG s
zSafeFileCache.delete)
�__name__�
__module__� __qualname__�__doc__r r r% r* r, �
__classcell__r r r r
r s r )r0 r �
contextlibr Z pip._vendor.cachecontrol.cacher Z pip._vendor.cachecontrol.cachesr Z pip._internal.utils.filesystemr r Zpip._internal.utils.miscr Zpip._internal.utils.typingr �typingr r r r r r r
� s