3 \Y+@sddlZddlZddlmZddlmZddlmZddlm Z ddl m Z ddl m Z ddlmZdd lmZmZmZd%d d Ze d dddZd&ddZddZddZddZddZddZddZdd Zd!d"Zd#d$ZdS)'N) import_module)apps)MODELS_MODULE_NAME)settings)AppRegistryNotReady) lru_cache) import_string)AppNotFoundErrorClassNotFoundErrorModuleNotFoundError oscar.appscCst||g|dS)a Dynamically import a single class from the given module. This is a simple wrapper around `get_classes` for the case of loading a single class. Args: module_label (str): Module label comprising the app label and the module name, separated by a dot. For example, 'catalogue.forms'. classname (str): Name of the class to be imported. Returns: The requested class object or `None` if it can't be found r) get_classes) module_label classname module_prefixr-/var/www/html/oscar2019/oscar/core/loading.py get_classsrd)maxsizecCs ttjS)N)rrOSCAR_DYNAMIC_CLASS_LOADERrrrrget_class_loader"srcCst}||||S)N)r)r classnamesrZ class_loaderrrrr 'sr c Csd|krtdd||f}t||}t|\}}|jd|rFd}n |j|dd}||} t| |}||koxdknrtd|t||g|S) a Dynamically import a list of classes from the given module. This works by looping over ``INSTALLED_APPS`` and looking for a match against the passed module label. If the requested class can't be found in the matching module, then we attempt to import it from the corresponding core app. This is very similar to ``django.db.models.get_model`` function for dynamically loading models. This function is more general though as it can load any class from the matching app, not just a model. Args: module_label (str): Module label comprising the app label and the module name, separated by a dot. For example, 'catalogue.forms'. classname (str): Name of the class to be imported. Returns: The requested class object or ``None`` if it can't be found Examples: Load a single class: >>> get_class('dashboard.catalogue.forms', 'ProductForm') oscar.apps.dashboard.catalogue.forms.ProductForm Load a list of classes: >>> get_classes('dashboard.catalogue.forms', ... ['ProductForm', 'StockRecordForm']) [oscar.apps.dashboard.catalogue.forms.ProductForm, oscar.apps.dashboard.catalogue.forms.StockRecordForm] Raises: AppNotFoundError: If no app is found in ``INSTALLED_APPS`` that matches the passed module label. ImportError: If the attempted import of a class raises an ``ImportError``, it is re-raised .z1Importing from top-level modules is not supportedz%s.%sz%s.NzThe module with label '%s' could not be imported. This eithermeans that it indeed does not exist, or you might have a problem with a circular import.) ValueError_import_module_find_installed_apps_entry startswithreplacer _pluck_classes) rrrZoscar_module_labelZ oscar_moduleZinstalled_apps_entryapp_nameZ local_moduleZ sub_moduleZlocal_module_labelrrrdefault_class_loader,s ,    r#c CsLy t||dStk rFtj\}}}tj|}t|dkrBYnXdS)z Imports the module with the given name. Returns None if the module doesn't exist, but propagates any import errors. )fromlistrN) __import__ ImportErrorsysexc_info traceback extract_tblen)rr__ exc_tracebackframesrrrrs    rcCspg}xf|D]^}d}x"|D]}t||rt||}PqW|s^dd|D}td|dj|f|j|q W|S)z Gets a list of class names and a list of modules to pick from. For each class name, will return the class from the first module that has a matching class. NcSsg|]}|dk r|jqS)N)__name__).0mrrr sz"_pluck_classes..zNo class '%s' found in %sz, )hasattrgetattrr joinappend)modulesrZklassesrklassmodulepackagesrrrr!s    r!cCs.x(tjD]}||ks"|jd|r|SqWdS)a Given an app name (e.g. 'catalogue'), walk through INSTALLED_APPS and return the first match, or None. This does depend on the order of INSTALLED_APPS and will break if e.g. 'dashboard.catalogue' comes before 'catalogue' in INSTALLED_APPS. rN)rINSTALLED_APPSendswith)r"Z installed_apprrr_get_installed_apps_entrys r=csX|jdfddtdtD}x |D]}t|}|r,||fSq,Wtd|dS)a} Given a module label, finds the best matching INSTALLED_APPS entry. This is made trickier by the fact that we don't know what part of the module_label is part of the INSTALLED_APPS entry. So we try all possible combinations, trying the longer versions first. E.g. for 'dashboard.catalogue.forms', 'dashboard.catalogue' is attempted before 'dashboard' rcs g|]}djd| qS)rN)r5)r0count)r7rrr2sz._find_installed_apps_entry..rz&Couldn't find an app to import %s fromN)splitranger+r=r )r combinationsr"entryr)r7rrs   rcCs2ttdd}|dkrdStjjd\}}t||S)z( Return the profile model class AUTH_PROFILE_MODULENr)r4rrCr? get_model)setting app_label model_namerrrget_profile_classs rHcCs|dk o|tjkS)z6 Test if a certain Oscar feature is disabled. N)rOSCAR_HIDDEN_FEATURES)Z feature_namerrrfeature_hiddensrJc Cs^y tj||Stk rXtjrRtj rRtj|}td|jtftj ||SYnXdS)a^ Fetches a Django model using the app registry. This doesn't require that an app with the given app label exists, which makes it safe to call when the registry is being populated. All other methods to access models might raise an exception about the registry not being ready yet. Raises LookupError if model isn't found. z%s.%sN) rrDr apps_ready models_readyget_app_configrnamerget_registered_model)rFrG app_configrrrrDs    rDc Cs.ytj||Wntk r$dSXdSdS)z Checks whether a given model is registered. This is used to only register Oscar models if they aren't overridden by a forked app. FTN)rrO LookupError)rFrGrrris_model_registereds rR)r )r ) r'r) importlibr django.appsrZdjango.apps.configr django.confrdjango.core.exceptionsrZdjango.utils.lru_cacherdjango.utils.module_loadingrZoscar.core.exceptionsr r r rrr r#rr!r=rrHrJrDrRrrrrs*         T!