U
    @vgZ	                     @   s   d Z ddlZddlmZ ddlmZ ddlmZ ddlm	Z	 ddl
mZmZ ddlmZ dd	lmZ ertdd
lmZ dd Zedd ZG dd deZdS )zHTTP cache implementation.
    N)contextmanager)	BaseCache)	FileCache)Response)adjacent_tmp_filereplace)
ensure_dir)MYPY_CHECK_RUNNING)Optionalc                 C   s   t | ddS )N
from_cacheF)getattr)response r   ?/tmp/pip-unpacked-wheel-gw11q0wt/pip/_internal/network/cache.pyis_from_cache   s    r   c                	   c   s(   z
dV  W n t tfk
r"   Y nX dS )zvIf we can't access the cache then we can just skip caching and process
    requests as if caching wasn't enabled.
    N)OSErrorIOErrorr   r   r   r   suppressed_cache_errors   s    
r   c                       s@   e Zd ZdZ fddZdd Zdd Zdd	 Zd
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	st dtt|   || _d S )Nz!Cache directory must not be None.)AssertionErrorsuperr   __init__	directory)selfr   	__class__r   r   r   ,   s    zSafeFileCache.__init__c                 C   s4   t |}t|d d |g }tjj| jf| S )N   )r   encodelistospathjoinr   )r   namehashedpartsr   r   r   _get_cache_path2   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   get;   s    
zSafeFileCache.getc              
   C   sZ   |  |}t @ ttj| 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   setB   s    

zSafeFileCache.setc              	   C   s*   |  |}t  t| W 5 Q R X d S r,   )r%   r   r   remove)r   r)   r    r   r   r   deleteM   s    
zSafeFileCache.delete)
__name__
__module____qualname____doc__r   r%   r+   r0   r2   __classcell__r   r   r   r   r   &   s   	r   )r6   r   
contextlibr   pip._vendor.cachecontrol.cacher   pip._vendor.cachecontrol.cachesr   pip._vendor.requests.modelsr   pip._internal.utils.filesystemr   r   pip._internal.utils.miscr   pip._internal.utils.typingr	   typingr
   r   r   r   r   r   r   r   <module>   s   

