B
    Hea                 @   s   d Z ddlZddlmZ ddlmZ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 eed
ddZeed dddZG dd deZdS )zHTTP cache implementation.
    N)contextmanager)	GeneratorOptional)	BaseCache)	FileCache)Response)adjacent_tmp_filereplace)
ensure_dir)responsereturnc             C   s   t | ddS )N
from_cacheF)getattr)r    r   o/var/www/downstreamdata.science/rtclock/rtclock-venv/lib/python3.7/site-packages/pip/_internal/network/cache.pyis_from_cache   s    r   )NNN)r   c               c   s$   y
dV  W n t k
r   Y nX dS )zvIf we can't access the cache then we can just skip caching and process
    requests as if caching wasn't enabled.
    N)OSErrorr   r   r   r   suppressed_cache_errors   s    
r   c                   sv   e Zd ZdZedd fddZeedddZeee d	d
dZ	deeee
 ddddZedd	ddZ  ZS )SafeFileCachezw
    A file based cache which is safe to use even when the target directory may
    not be accessible or writable.
    N)	directoryr   c                s$   |d k	st dt   || _d S )Nz!Cache directory must not be None.)AssertionErrorsuper__init__r   )selfr   )	__class__r   r   r   %   s    
zSafeFileCache.__init__)namer   c             C   s4   t |}t|d d |g }tjj| jf| S )N   )r   encodelistospathjoinr   )r   r   hashedpartsr   r   r   _get_cache_path*   s    
zSafeFileCache._get_cache_path)keyr   c          
   C   s:   |  |}t   t|d
}| S Q R X W d Q R X d S )Nrb)r$   r   openread)r   r%   r    fr   r   r   get2   s    
zSafeFileCache.get)r%   valueexpiresr   c          
   C   sZ   |  |}t @ ttj| t|}|| W d Q R X t|j	| W d Q R X d S )N)
r$   r   r
   r   r    dirnamer   writer	   r   )r   r%   r+   r,   r    r)   r   r   r   set8   s    

zSafeFileCache.setc          	   C   s*   |  |}t  t| W d Q R X d S )N)r$   r   r   remove)r   r%   r    r   r   r   deleteB   s    
zSafeFileCache.delete)N)__name__
__module____qualname____doc__strr   r$   r   bytesr*   intr/   r1   __classcell__r   r   )r   r   r      s   
r   )r5   r   
contextlibr   typingr   r   Zpip._vendor.cachecontrol.cacher   pip._vendor.cachecontrol.cachesr   Zpip._vendor.requests.modelsr   pip._internal.utils.filesystemr   r	   pip._internal.utils.miscr
   boolr   r   r   r   r   r   r   <module>   s   
