U
    g
                     @   sD   d dl mZ d dlmZmZmZ d dlmZ dZG dd deZ	dS )    )settings)CreateErrorSessionBaseUpdateError)cacheszdjango.contrib.sessions.cachec                       sj   e Zd ZdZeZd fdd	Zedd Zdd Z	d	d
 Z
dddZdd ZdddZedd Z  ZS )SessionStorez&
    A cache-based session store.
    Nc                    s   t tj | _t | d S N)r   r   ZSESSION_CACHE_ALIAS_cachesuper__init__selfsession_key	__class__ J/tmp/pip-unpacked-wheel-ye1bytdm/django/contrib/sessions/backends/cache.pyr      s    zSessionStore.__init__c                 C   s   | j |   S r   )cache_key_prefixZ_get_or_create_session_key)r   r   r   r   	cache_key   s    zSessionStore.cache_keyc                 C   sB   z| j | j}W n tk
r*   d }Y nX |d k	r8|S d | _i S r   )r	   getr   	Exception_session_key)r   Zsession_datar   r   r   load   s    
zSessionStore.loadc              	   C   sX   t dD ]B}|  | _z| jdd W n tk
r>   Y qY nX d| _ d S tdd S )Ni'  T)must_createzOUnable to create a new session key. It is likely that the cache is unavailable.)rangeZ_get_new_session_keyr   saver   modifiedRuntimeError)r   ir   r   r   create$   s    

zSessionStore.createFc                 C   sj   | j d kr|  S |r | jj}n | j| jd k	r<| jj}nt|| j| j|d| 	 }|rf|sft
d S )N)Zno_load)r   r   r	   addr   r   setr   Z_get_sessionZget_expiry_ager   )r   r   funcresultr   r   r   r   6   s    



zSessionStore.savec                 C   s   t |o| j| | jkS r   )boolr   r	   r   r   r   r   existsE   s    zSessionStore.existsc                 C   s2   |d kr| j d krd S | j }| j| j|  d S r   )r   r	   deleter   r   r   r   r   r&   H   s
    
zSessionStore.deletec                 C   s   d S r   r   )clsr   r   r   clear_expiredO   s    zSessionStore.clear_expired)N)F)N)__name__
__module____qualname____doc__
KEY_PREFIXr   r   propertyr   r   r   r   r%   r&   classmethodr(   __classcell__r   r   r   r   r   
   s   


r   N)
Zdjango.confr   Z%django.contrib.sessions.backends.baser   r   r   Zdjango.core.cacher   r-   r   r   r   r   r   <module>   s   