U
    mf?$                     @   s,  d dl Z d dlmZ d dlmZ d dlmZ d dlmZ d dlm	Z	 d dl
mZ d dlmZ d	Zd
ZG dd deZG dd deZG dd deZG dd deZG dd deZG dd deZG dd deZG dd deZG dd deZG dd dZdd  ZG d!d" d"e	ZG d#d$ 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-siwebuq3/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   1   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__C   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__F   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   5   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 )>   dummybaser   ).0_nameispkgr   r   r   
<listcomp>w   s    z load_backend.<locals>.<listcomp>c                 S   s   g | ]}d | qS )zdjango.db.backends.%sr   )r2   br   r   r   r6   |   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_backendg   s&    	rC   c                       s8   e Zd ZdZdZ fddZedd Zdd Z  Z	S )	ConnectionHandlerZ	DATABASESTc                    s"  t  |}|i kr"ddi|t< n2t|kr<tdt dn|t i krTd|t d< | D ]}|dd |dd |dd |d d	ks|d sd|d< |d
d |dd |di  |dd  dD ]}||d q|di }dddddg}|D ]\}}||| qq\|S )NENGINEzdjango.db.backends.dummyzYou must define a 'z' database.ZATOMIC_REQUESTSFZ
AUTOCOMMITTzdjango.db.backends.ZCONN_MAX_AGEr   ZCONN_HEALTH_CHECKSOPTIONSZ	TIME_ZONE)NAMEUSERZPASSWORDZHOSTZPORT ZTEST)CHARSETN)Z	COLLATIONN)ZMIGRATET)ZMIRRORN)rG   N)superconfigure_settingsDEFAULT_DB_ALIASr   values
setdefault)r   	databasesconnZsettingZtest_settingsZdefault_test_settingskeyvalue	__class__r   r   rL      s>    
z$ConnectionHandler.configure_settingsc                 C   s   | j S r   r   r   r   r   r   rP      s    zConnectionHandler.databasesc                 C   s"   | j | }t|d }|||S )NrE   )r   rC   ZDatabaseWrapper)r   aliasr;   backendr   r   r   create_connection   s    
z#ConnectionHandler.create_connection)
r   r   r   Zsettings_nameZthread_criticalrL   propertyrP   rX   __classcell__r   r   rT   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   )r\   r   ZDATABASE_ROUTERS
isinstancestrr	   append)r   r]   rrouterr   r   r   r]      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)r]   r"   AttributeErrorget_stater;   rM   )r   modelhintsZ	chosen_dbrb   methodrc   actionr   r   	_route_db   s    


z0ConnectionRouter._router_func.<locals>._route_dbr   )rk   rl   r   rj   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   )r]   allow_relationrd   rf   r;   )r   Zobj1obj2rh   rb   ri   allowr   r   r   rp      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!   )r]   allow_migraterd   )r   r;   	app_labelrh   rb   ri   rr   r   r   r   rs      s    



zConnectionRouter.allow_migratec                 C   s   | j ||jj|jj|dS )N)
model_namerg   )rs   Z_metart   ru   )r   r;   rg   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   )rv   )r2   rg   r;   r   r   r   r6     s      z:ConnectionRouter.get_migratable_models.<locals>.<listcomp>)Z
get_models)r   Z
app_configr;   rw   modelsr   rx   r   get_migratable_models  s    z&ConnectionRouter.get_migratable_models)N)F)r   r   r   r   r   r]   rm   rn   ro   rp   rs   rv   rz   r   r   r   r   r[      s   

r[   )r9   	importlibr   Zdjango.confr   Zdjango.core.exceptionsr   Zdjango.utils.connectionr   r   Zdjango.utils.functionalr   Zdjango.utils.module_loadingr	   rM   ZDJANGO_VERSION_PICKLE_KEY	Exceptionr   r   r   r   r   r   r   r   r   r   rC   rD   r[   r   r   r   r   <module>   s,   2#;