U
    g                     @   s@   d Z ddlmZ ddlmZ ddlmZ dZG dd deZdS )	z#
Cached, database-backed sessions.
    )settings)SessionStore)cachesz!django.contrib.sessions.cached_dbc                       sj   e Zd ZdZeZd fdd	Zedd Zdd Z	 fd	d
Z
d fdd	Zd fdd	Zdd Z  ZS )r   z5
    Implement cached, database backed sessions.
    Nc                    s   t tj | _t | d S N)r   r   ZSESSION_CACHE_ALIAS_cachesuper__init__selfsession_key	__class__ N/tmp/pip-unpacked-wheel-ye1bytdm/django/contrib/sessions/backends/cached_db.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   sr   z| j | j}W n tk
r*   d }Y nX |d krn|  }|rj| |j}| j | j|| j|j	d ni }|S )N)Zexpiry)
r   getr   	ExceptionZ_get_session_from_dbdecodeZsession_datasetget_expiry_ageZexpire_date)r
   datasr   r   r   load   s    
zSessionStore.loadc                    s    |r| j | | jkpt |S r   )r   r   r   existsr	   r   r   r   r   +   s    zSessionStore.existsFc                    s(   t  | | j| j| j|   d S r   )r   saver   r   r   _sessionr   )r
   Zmust_creater   r   r   r   .   s    zSessionStore.savec                    s>   t  | |d kr(| jd kr"d S | j}| j| j|  d S r   )r   deleter   r   r   r	   r   r   r   r   2   s    
zSessionStore.deletec                 C   s   |    | | j d| _dS )zc
        Remove the current session data from the database and regenerate the
        key.
        N)clearr   r   Z_session_keyr   r   r   r   flush:   s    zSessionStore.flush)N)F)N)__name__
__module____qualname____doc__
KEY_PREFIXr   r   propertyr   r   r   r   r   r    __classcell__r   r   r   r   r      s   
r   N)	r$   Zdjango.confr   Z#django.contrib.sessions.backends.dbr   ZDBStoreZdjango.core.cacher   r%   r   r   r   r   <module>   s
   