U
    Ha~&                     @   s,  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	 d dl
mZ d dlmZ d	Zd
ZG dd deZG dd deZG dd deZG dd deZG dd deZG dd deZG dd deZG dd deZG dd deZG dd dZdd  ZG d!d" d"e	ZG d#d$ d$ZdS )%    N)import_modulesettings)ImproperlyConfigured)ConnectionDoesNotExist)BaseConnectionHandler)cached_property)import_stringdefaultZ_django_versionc                   @   s   e Zd ZdS )ErrorN__name__
__module____qualname__ r   r   3/tmp/pip-unpacked-wheel-3jxiddxt/django/db/utils.pyr      s   r   c                   @   s   e Zd ZdS )InterfaceErrorNr   r   r   r   r   r      s   r   c                   @   s   e Zd ZdS )DatabaseErrorNr   r   r   r   r   r      s   r   c                   @   s   e Zd ZdS )	DataErrorNr   r   r   r   r   r      s   r   c                   @   s   e Zd ZdS )OperationalErrorNr   r   r   r   r   r       s   r   c                   @   s   e Zd ZdS )IntegrityErrorNr   r   r   r   r   r   $   s   r   c                   @   s   e Zd ZdS )InternalErrorNr   r   r   r   r   r   (   s   r   c                   @   s   e Zd ZdS )ProgrammingErrorNr   r   r   r   r   r   ,   s   r   c                   @   s   e Zd ZdS )NotSupportedErrorNr   r   r   r   r   r   0   s   r   c                   @   s0   e Zd ZdZdd Zdd Zdd Zdd	 Zd
S )DatabaseErrorWrapperz~
    Context manager and decorator that reraises backend-specific database
    exceptions using Django's common wrappers.
    c                 C   s
   || _ dS )zx
        wrapper is a database wrapper.

        It must have a Database attribute defining PEP-249 exceptions.
        N)wrapper)selfr   r   r   r   __init__:   s    zDatabaseErrorWrapper.__init__c                 C   s   d S Nr   r   r   r   r   	__enter__B   s    zDatabaseErrorWrapper.__enter__c              	   C   sp   |d krd S t ttttttttf	D ]H}t	| j
j|j}t||r"||j }|t tfkr^d| j
_|||q"d S NT)r   r   r   r   r   r   r   r   r   getattrr   ZDatabaser   
issubclassargsZerrors_occurredwith_traceback)r   exc_type	exc_value	tracebackZdj_exc_typeZdb_exc_typeZdj_exc_valuer   r   r   __exit__E   s$    

zDatabaseErrorWrapper.__exit__c                    s    fdd}|S )Nc               
      s&     | |W  5 Q R  S Q R X d S r   r   )r$   kwargsfuncr   r   r   inner_   s    z,DatabaseErrorWrapper.__call__.<locals>.innerr   )r   r,   r-   r   r+   r   __call__\   s    zDatabaseErrorWrapper.__call__N)r   r   r   __doc__r   r    r)   r.   r   r   r   r   r   4   s
   r   c              
   C   s   | dkrd} zt d|  W S  tk
r } zbddl}dd t|jjjD }| dd |D krtt	t
|}td	| d
|f |n W 5 d}~X Y nX dS )z
    Return a database backend's "base" module given a fully qualified database
    backend name, or raise an error if it doesn't exist.
    z&django.db.backends.postgresql_psycopg2zdjango.db.backends.postgresqlz%s.baser   Nc                 S   s"   g | ]\}}}|r|d kr|qS )>   basedummyr   ).0_nameispkgr   r   r   
<listcomp>t   s    z load_backend.<locals>.<listcomp>c                 S   s   g | ]}d | qS )zdjango.db.backends.%sr   )r2   br   r   r   r6   x   s     z%r isn't an available database backend or couldn't be imported. Check the above exception. To use one of the built-in backends, use 'django.db.backends.XXX', where XXX is one of:
    %sz, )r   ImportErrorZdjango.db.backendspkgutiliter_modulesdbbackends__path__mapreprsortedr   join)backend_nameZe_userZdjangoZbuiltin_backendsZbackend_reprsr   r   r   load_backende   s&    	rC   c                       sP   e Zd ZdZdZ fddZedd Zdd Zd	d
 Z	dd Z
dd Z  ZS )ConnectionHandlerZ	DATABASESTc                    sX   t  |}|i kr"ddi|t< n2t|kr<tdt dn|t i krTd|t d< |S )NENGINEdjango.db.backends.dummyzYou must define a 'z' database.)superconfigure_settingsDEFAULT_DB_ALIASr   )r   	databases	__class__r   r   rH      s    
z$ConnectionHandler.configure_settingsc                 C   s   | j S r   r   r   r   r   r   rJ      s    zConnectionHandler.databasesc                 C   s   z| j | }W n& tk
r4   | d| dY nX |dd |dd |dd |d d	ksn|d svd|d< |d
d |di  |dd dD ]}||d qdS )z}
        Put the defaults into the settings dictionary for a given connection
        where no settings is provided.
        The connection '' doesn't exist.ZATOMIC_REQUESTSFZ
AUTOCOMMITTrE   rF   zdjango.db.backends.ZCONN_MAX_AGEr   OPTIONSZ	TIME_ZONEN)NAMEUSERZPASSWORDZHOSTZPORT rJ   KeyErrorZexception_class
setdefault)r   aliasconnZsettingr   r   r   ensure_defaults   s    z!ConnectionHandler.ensure_defaultsc                 C   sn   z| j | }W n& tk
r4   | d| dY nX |di }dddddg}|D ]\}}||| qTd	S )
zY
        Make sure the test settings are available in the 'TEST' sub-dictionary.
        rM   rN   ZTEST)CHARSETN)Z	COLLATIONN)ZMIGRATET)ZMIRRORN)rP   NNrS   )r   rV   rW   Ztest_settingsZdefault_test_settingskeyvaluer   r   r   prepare_test_settings   s    z'ConnectionHandler.prepare_test_settingsc                 C   s6   |  | | | | j| }t|d }|||S )NrE   )rX   r\   rJ   rC   ZDatabaseWrapper)r   rV   r;   backendr   r   r   create_connection   s
    


z#ConnectionHandler.create_connectionc              	   C   s@   | D ]6}zt | j|}W n tk
r0   Y qY nX |  qd S r   )r"   Z_connectionsAttributeErrorclose)r   rV   
connectionr   r   r   	close_all   s    
zConnectionHandler.close_all)r   r   r   Zsettings_nameZthread_criticalrH   propertyrJ   rX   r\   r^   rb   __classcell__r   r   rK   r   rD      s   
rD   c                   @   s\   e Zd ZdddZedd Zdd ZedZed	Zd
d Z	dd Z
dd ZdddZdS )ConnectionRouterNc                 C   s
   || _ dS )zT
        If routers is not specified, default to settings.DATABASE_ROUTERS.
        N)_routers)r   routersr   r   r   r      s    zConnectionRouter.__init__c                 C   sJ   | j d krtj| _ g }| j D ](}t|tr6t| }n|}|| q|S r   )rf   r   ZDATABASE_ROUTERS
isinstancestrr	   append)r   rg   rrouterr   r   r   rg      s    


zConnectionRouter.routersc                    s    fdd}|S )Nc              	      sr   d }| j D ]@}zt| }W n tk
r0   Y q
X ||f|}|r
|  S q
|d}|d k	rn|jjrn|jjS tS )Ninstance)rg   r"   r_   get_stater;   rI   )r   modelhintsZ	chosen_dbrl   methodrm   actionr   r   	_route_db   s    


z0ConnectionRouter._router_func.<locals>._route_dbr   )rt   ru   r   rs   r   _router_func   s    zConnectionRouter._router_funcdb_for_readdb_for_writec              	   K   sZ   | j D ]B}z
|j}W n tk
r(   Y qX |||f|}|d k	r|  S q|jj|jjkS r   )rg   allow_relationr_   ro   r;   )r   Zobj1obj2rq   rl   rr   allowr   r   r   ry     s    


zConnectionRouter.allow_relationc              	   K   sR   | j D ]F}z
|j}W n tk
r,   Y qY nX |||f|}|d k	r|  S qdS r!   )rg   allow_migrater_   )r   r;   	app_labelrq   rl   rr   r{   r   r   r   r|     s    



zConnectionRouter.allow_migratec                 C   s   | j ||jj|jj|dS )N)
model_namerp   )r|   Z_metar}   r~   )r   r;   rp   r   r   r   allow_migrate_model  s    z$ConnectionRouter.allow_migrate_modelFc                    s    |j |d} fdd|D S )z8Return app models allowed to be migrated on provided db.)include_auto_createdc                    s   g | ]}  |r|qS r   )r   )r2   rp   r;   r   r   r   r6   (  s      z:ConnectionRouter.get_migratable_models.<locals>.<listcomp>)Z
get_models)r   Z
app_configr;   r   modelsr   r   r   get_migratable_models%  s    z&ConnectionRouter.get_migratable_models)N)F)r   r   r   r   r   rg   rv   rw   rx   ry   r|   r   r   r   r   r   r   re      s   

re   )r9   	importlibr   Zdjango.confr   Zdjango.core.exceptionsr   Zdjango.utils.connectionr   r   Zdjango.utils.functionalr   Zdjango.utils.module_loadingr	   rI   ZDJANGO_VERSION_PICKLE_KEY	Exceptionr   r   r   r   r   r   r   r   r   r   rC   rD   re   r   r   r   r   <module>   s,   1!R