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AdrienLSH
2023-11-23 16:43:30 +01:00
parent fd19180e1d
commit f29003c66a
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srcs/.venv/lib/python3.11/site-packages/django/apps/__init__.py Normal file
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from .config import AppConfig
from .registry import apps
__all__ = ["AppConfig", "apps"]

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import inspect
import os
from importlib import import_module
from django.core.exceptions import ImproperlyConfigured
from django.utils.functional import cached_property
from django.utils.module_loading import import_string, module_has_submodule
APPS_MODULE_NAME = "apps"
MODELS_MODULE_NAME = "models"
class AppConfig:
"""Class representing a Django application and its configuration."""
def __init__(self, app_name, app_module):
# Full Python path to the application e.g. 'django.contrib.admin'.
self.name = app_name
# Root module for the application e.g. <module 'django.contrib.admin'
# from 'django/contrib/admin/__init__.py'>.
self.module = app_module
# Reference to the Apps registry that holds this AppConfig. Set by the
# registry when it registers the AppConfig instance.
self.apps = None
# The following attributes could be defined at the class level in a
# subclass, hence the test-and-set pattern.
# Last component of the Python path to the application e.g. 'admin'.
# This value must be unique across a Django project.
if not hasattr(self, "label"):
self.label = app_name.rpartition(".")[2]
if not self.label.isidentifier():
raise ImproperlyConfigured(
"The app label '%s' is not a valid Python identifier." % self.label
)
# Human-readable name for the application e.g. "Admin".
if not hasattr(self, "verbose_name"):
self.verbose_name = self.label.title()
# Filesystem path to the application directory e.g.
# '/path/to/django/contrib/admin'.
if not hasattr(self, "path"):
self.path = self._path_from_module(app_module)
# Module containing models e.g. <module 'django.contrib.admin.models'
# from 'django/contrib/admin/models.py'>. Set by import_models().
# None if the application doesn't have a models module.
self.models_module = None
# Mapping of lowercase model names to model classes. Initially set to
# None to prevent accidental access before import_models() runs.
self.models = None
def __repr__(self):
return "<%s: %s>" % (self.__class__.__name__, self.label)
@cached_property
def default_auto_field(self):
from django.conf import settings
return settings.DEFAULT_AUTO_FIELD
@property
def _is_default_auto_field_overridden(self):
return self.__class__.default_auto_field is not AppConfig.default_auto_field
def _path_from_module(self, module):
"""Attempt to determine app's filesystem path from its module."""
# See #21874 for extended discussion of the behavior of this method in
# various cases.
# Convert to list because __path__ may not support indexing.
paths = list(getattr(module, "__path__", []))
if len(paths) != 1:
filename = getattr(module, "__file__", None)
if filename is not None:
paths = [os.path.dirname(filename)]
else:
# For unknown reasons, sometimes the list returned by __path__
# contains duplicates that must be removed (#25246).
paths = list(set(paths))
if len(paths) > 1:
raise ImproperlyConfigured(
"The app module %r has multiple filesystem locations (%r); "
"you must configure this app with an AppConfig subclass "
"with a 'path' class attribute." % (module, paths)
)
elif not paths:
raise ImproperlyConfigured(
"The app module %r has no filesystem location, "
"you must configure this app with an AppConfig subclass "
"with a 'path' class attribute." % module
)
return paths[0]
@classmethod
def create(cls, entry):
"""
Factory that creates an app config from an entry in INSTALLED_APPS.
"""
# create() eventually returns app_config_class(app_name, app_module).
app_config_class = None
app_name = None
app_module = None
# If import_module succeeds, entry points to the app module.
try:
app_module = import_module(entry)
except Exception:
pass
else:
# If app_module has an apps submodule that defines a single
# AppConfig subclass, use it automatically.
# To prevent this, an AppConfig subclass can declare a class
# variable default = False.
# If the apps module defines more than one AppConfig subclass,
# the default one can declare default = True.
if module_has_submodule(app_module, APPS_MODULE_NAME):
mod_path = "%s.%s" % (entry, APPS_MODULE_NAME)
mod = import_module(mod_path)
# Check if there's exactly one AppConfig candidate,
# excluding those that explicitly define default = False.
app_configs = [
(name, candidate)
for name, candidate in inspect.getmembers(mod, inspect.isclass)
if (
issubclass(candidate, cls)
and candidate is not cls
and getattr(candidate, "default", True)
)
]
if len(app_configs) == 1:
app_config_class = app_configs[0][1]
else:
# Check if there's exactly one AppConfig subclass,
# among those that explicitly define default = True.
app_configs = [
(name, candidate)
for name, candidate in app_configs
if getattr(candidate, "default", False)
]
if len(app_configs) > 1:
candidates = [repr(name) for name, _ in app_configs]
raise RuntimeError(
"%r declares more than one default AppConfig: "
"%s." % (mod_path, ", ".join(candidates))
)
elif len(app_configs) == 1:
app_config_class = app_configs[0][1]
# Use the default app config class if we didn't find anything.
if app_config_class is None:
app_config_class = cls
app_name = entry
# If import_string succeeds, entry is an app config class.
if app_config_class is None:
try:
app_config_class = import_string(entry)
except Exception:
pass
# If both import_module and import_string failed, it means that entry
# doesn't have a valid value.
if app_module is None and app_config_class is None:
# If the last component of entry starts with an uppercase letter,
# then it was likely intended to be an app config class; if not,
# an app module. Provide a nice error message in both cases.
mod_path, _, cls_name = entry.rpartition(".")
if mod_path and cls_name[0].isupper():
# We could simply re-trigger the string import exception, but
# we're going the extra mile and providing a better error
# message for typos in INSTALLED_APPS.
# This may raise ImportError, which is the best exception
# possible if the module at mod_path cannot be imported.
mod = import_module(mod_path)
candidates = [
repr(name)
for name, candidate in inspect.getmembers(mod, inspect.isclass)
if issubclass(candidate, cls) and candidate is not cls
]
msg = "Module '%s' does not contain a '%s' class." % (
mod_path,
cls_name,
)
if candidates:
msg += " Choices are: %s." % ", ".join(candidates)
raise ImportError(msg)
else:
# Re-trigger the module import exception.
import_module(entry)
# Check for obvious errors. (This check prevents duck typing, but
# it could be removed if it became a problem in practice.)
if not issubclass(app_config_class, AppConfig):
raise ImproperlyConfigured("'%s' isn't a subclass of AppConfig." % entry)
# Obtain app name here rather than in AppClass.__init__ to keep
# all error checking for entries in INSTALLED_APPS in one place.
if app_name is None:
try:
app_name = app_config_class.name
except AttributeError:
raise ImproperlyConfigured("'%s' must supply a name attribute." % entry)
# Ensure app_name points to a valid module.
try:
app_module = import_module(app_name)
except ImportError:
raise ImproperlyConfigured(
"Cannot import '%s'. Check that '%s.%s.name' is correct."
% (
app_name,
app_config_class.__module__,
app_config_class.__qualname__,
)
)
# Entry is a path to an app config class.
return app_config_class(app_name, app_module)
def get_model(self, model_name, require_ready=True):
"""
Return the model with the given case-insensitive model_name.
Raise LookupError if no model exists with this name.
"""
if require_ready:
self.apps.check_models_ready()
else:
self.apps.check_apps_ready()
try:
return self.models[model_name.lower()]
except KeyError:
raise LookupError(
"App '%s' doesn't have a '%s' model." % (self.label, model_name)
)
def get_models(self, include_auto_created=False, include_swapped=False):
"""
Return an iterable of models.
By default, the following models aren't included:
- auto-created models for many-to-many relations without
an explicit intermediate table,
- models that have been swapped out.
Set the corresponding keyword argument to True to include such models.
Keyword arguments aren't documented; they're a private API.
"""
self.apps.check_models_ready()
for model in self.models.values():
if model._meta.auto_created and not include_auto_created:
continue
if model._meta.swapped and not include_swapped:
continue
yield model
def import_models(self):
# Dictionary of models for this app, primarily maintained in the
# 'all_models' attribute of the Apps this AppConfig is attached to.
self.models = self.apps.all_models[self.label]
if module_has_submodule(self.module, MODELS_MODULE_NAME):
models_module_name = "%s.%s" % (self.name, MODELS_MODULE_NAME)
self.models_module = import_module(models_module_name)
def ready(self):
"""
Override this method in subclasses to run code when Django starts.
"""

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import functools
import sys
import threading
import warnings
from collections import Counter, defaultdict
from functools import partial
from django.core.exceptions import AppRegistryNotReady, ImproperlyConfigured
from .config import AppConfig
class Apps:
"""
A registry that stores the configuration of installed applications.
It also keeps track of models, e.g. to provide reverse relations.
"""
def __init__(self, installed_apps=()):
# installed_apps is set to None when creating the main registry
# because it cannot be populated at that point. Other registries must
# provide a list of installed apps and are populated immediately.
if installed_apps is None and hasattr(sys.modules[__name__], "apps"):
raise RuntimeError("You must supply an installed_apps argument.")
# Mapping of app labels => model names => model classes. Every time a
# model is imported, ModelBase.__new__ calls apps.register_model which
# creates an entry in all_models. All imported models are registered,
# regardless of whether they're defined in an installed application
# and whether the registry has been populated. Since it isn't possible
# to reimport a module safely (it could reexecute initialization code)
# all_models is never overridden or reset.
self.all_models = defaultdict(dict)
# Mapping of labels to AppConfig instances for installed apps.
self.app_configs = {}
# Stack of app_configs. Used to store the current state in
# set_available_apps and set_installed_apps.
self.stored_app_configs = []
# Whether the registry is populated.
self.apps_ready = self.models_ready = self.ready = False
# For the autoreloader.
self.ready_event = threading.Event()
# Lock for thread-safe population.
self._lock = threading.RLock()
self.loading = False
# Maps ("app_label", "modelname") tuples to lists of functions to be
# called when the corresponding model is ready. Used by this class's
# `lazy_model_operation()` and `do_pending_operations()` methods.
self._pending_operations = defaultdict(list)
# Populate apps and models, unless it's the main registry.
if installed_apps is not None:
self.populate(installed_apps)
def populate(self, installed_apps=None):
"""
Load application configurations and models.
Import each application module and then each model module.
It is thread-safe and idempotent, but not reentrant.
"""
if self.ready:
return
# populate() might be called by two threads in parallel on servers
# that create threads before initializing the WSGI callable.
with self._lock:
if self.ready:
return
# An RLock prevents other threads from entering this section. The
# compare and set operation below is atomic.
if self.loading:
# Prevent reentrant calls to avoid running AppConfig.ready()
# methods twice.
raise RuntimeError("populate() isn't reentrant")
self.loading = True
# Phase 1: initialize app configs and import app modules.
for entry in installed_apps:
if isinstance(entry, AppConfig):
app_config = entry
else:
app_config = AppConfig.create(entry)
if app_config.label in self.app_configs:
raise ImproperlyConfigured(
"Application labels aren't unique, "
"duplicates: %s" % app_config.label
)
self.app_configs[app_config.label] = app_config
app_config.apps = self
# Check for duplicate app names.
counts = Counter(
app_config.name for app_config in self.app_configs.values()
)
duplicates = [name for name, count in counts.most_common() if count > 1]
if duplicates:
raise ImproperlyConfigured(
"Application names aren't unique, "
"duplicates: %s" % ", ".join(duplicates)
)
self.apps_ready = True
# Phase 2: import models modules.
for app_config in self.app_configs.values():
app_config.import_models()
self.clear_cache()
self.models_ready = True
# Phase 3: run ready() methods of app configs.
for app_config in self.get_app_configs():
app_config.ready()
self.ready = True
self.ready_event.set()
def check_apps_ready(self):
"""Raise an exception if all apps haven't been imported yet."""
if not self.apps_ready:
from django.conf import settings
# If "not ready" is due to unconfigured settings, accessing
# INSTALLED_APPS raises a more helpful ImproperlyConfigured
# exception.
settings.INSTALLED_APPS
raise AppRegistryNotReady("Apps aren't loaded yet.")
def check_models_ready(self):
"""Raise an exception if all models haven't been imported yet."""
if not self.models_ready:
raise AppRegistryNotReady("Models aren't loaded yet.")
def get_app_configs(self):
"""Import applications and return an iterable of app configs."""
self.check_apps_ready()
return self.app_configs.values()
def get_app_config(self, app_label):
"""
Import applications and returns an app config for the given label.
Raise LookupError if no application exists with this label.
"""
self.check_apps_ready()
try:
return self.app_configs[app_label]
except KeyError:
message = "No installed app with label '%s'." % app_label
for app_config in self.get_app_configs():
if app_config.name == app_label:
message += " Did you mean '%s'?" % app_config.label
break
raise LookupError(message)
# This method is performance-critical at least for Django's test suite.
@functools.lru_cache(maxsize=None)
def get_models(self, include_auto_created=False, include_swapped=False):
"""
Return a list of all installed models.
By default, the following models aren't included:
- auto-created models for many-to-many relations without
an explicit intermediate table,
- models that have been swapped out.
Set the corresponding keyword argument to True to include such models.
"""
self.check_models_ready()
result = []
for app_config in self.app_configs.values():
result.extend(app_config.get_models(include_auto_created, include_swapped))
return result
def get_model(self, app_label, model_name=None, require_ready=True):
"""
Return the model matching the given app_label and model_name.
As a shortcut, app_label may be in the form <app_label>.<model_name>.
model_name is case-insensitive.
Raise LookupError if no application exists with this label, or no
model exists with this name in the application. Raise ValueError if
called with a single argument that doesn't contain exactly one dot.
"""
if require_ready:
self.check_models_ready()
else:
self.check_apps_ready()
if model_name is None:
app_label, model_name = app_label.split(".")
app_config = self.get_app_config(app_label)
if not require_ready and app_config.models is None:
app_config.import_models()
return app_config.get_model(model_name, require_ready=require_ready)
def register_model(self, app_label, model):
# Since this method is called when models are imported, it cannot
# perform imports because of the risk of import loops. It mustn't
# call get_app_config().
model_name = model._meta.model_name
app_models = self.all_models[app_label]
if model_name in app_models:
if (
model.__name__ == app_models[model_name].__name__
and model.__module__ == app_models[model_name].__module__
):
warnings.warn(
"Model '%s.%s' was already registered. Reloading models is not "
"advised as it can lead to inconsistencies, most notably with "
"related models." % (app_label, model_name),
RuntimeWarning,
stacklevel=2,
)
else:
raise RuntimeError(
"Conflicting '%s' models in application '%s': %s and %s."
% (model_name, app_label, app_models[model_name], model)
)
app_models[model_name] = model
self.do_pending_operations(model)
self.clear_cache()
def is_installed(self, app_name):
"""
Check whether an application with this name exists in the registry.
app_name is the full name of the app e.g. 'django.contrib.admin'.
"""
self.check_apps_ready()
return any(ac.name == app_name for ac in self.app_configs.values())
def get_containing_app_config(self, object_name):
"""
Look for an app config containing a given object.
object_name is the dotted Python path to the object.
Return the app config for the inner application in case of nesting.
Return None if the object isn't in any registered app config.
"""
self.check_apps_ready()
candidates = []
for app_config in self.app_configs.values():
if object_name.startswith(app_config.name):
subpath = object_name[len(app_config.name) :]
if subpath == "" or subpath[0] == ".":
candidates.append(app_config)
if candidates:
return sorted(candidates, key=lambda ac: -len(ac.name))[0]
def get_registered_model(self, app_label, model_name):
"""
Similar to get_model(), but doesn't require that an app exists with
the given app_label.
It's safe to call this method at import time, even while the registry
is being populated.
"""
model = self.all_models[app_label].get(model_name.lower())
if model is None:
raise LookupError("Model '%s.%s' not registered." % (app_label, model_name))
return model
@functools.lru_cache(maxsize=None)
def get_swappable_settings_name(self, to_string):
"""
For a given model string (e.g. "auth.User"), return the name of the
corresponding settings name if it refers to a swappable model. If the
referred model is not swappable, return None.
This method is decorated with lru_cache because it's performance
critical when it comes to migrations. Since the swappable settings don't
change after Django has loaded the settings, there is no reason to get
the respective settings attribute over and over again.
"""
to_string = to_string.lower()
for model in self.get_models(include_swapped=True):
swapped = model._meta.swapped
# Is this model swapped out for the model given by to_string?
if swapped and swapped.lower() == to_string:
return model._meta.swappable
# Is this model swappable and the one given by to_string?
if model._meta.swappable and model._meta.label_lower == to_string:
return model._meta.swappable
return None
def set_available_apps(self, available):
"""
Restrict the set of installed apps used by get_app_config[s].
available must be an iterable of application names.
set_available_apps() must be balanced with unset_available_apps().
Primarily used for performance optimization in TransactionTestCase.
This method is safe in the sense that it doesn't trigger any imports.
"""
available = set(available)
installed = {app_config.name for app_config in self.get_app_configs()}
if not available.issubset(installed):
raise ValueError(
"Available apps isn't a subset of installed apps, extra apps: %s"
% ", ".join(available - installed)
)
self.stored_app_configs.append(self.app_configs)
self.app_configs = {
label: app_config
for label, app_config in self.app_configs.items()
if app_config.name in available
}
self.clear_cache()
def unset_available_apps(self):
"""Cancel a previous call to set_available_apps()."""
self.app_configs = self.stored_app_configs.pop()
self.clear_cache()
def set_installed_apps(self, installed):
"""
Enable a different set of installed apps for get_app_config[s].
installed must be an iterable in the same format as INSTALLED_APPS.
set_installed_apps() must be balanced with unset_installed_apps(),
even if it exits with an exception.
Primarily used as a receiver of the setting_changed signal in tests.
This method may trigger new imports, which may add new models to the
registry of all imported models. They will stay in the registry even
after unset_installed_apps(). Since it isn't possible to replay
imports safely (e.g. that could lead to registering listeners twice),
models are registered when they're imported and never removed.
"""
if not self.ready:
raise AppRegistryNotReady("App registry isn't ready yet.")
self.stored_app_configs.append(self.app_configs)
self.app_configs = {}
self.apps_ready = self.models_ready = self.loading = self.ready = False
self.clear_cache()
self.populate(installed)
def unset_installed_apps(self):
"""Cancel a previous call to set_installed_apps()."""
self.app_configs = self.stored_app_configs.pop()
self.apps_ready = self.models_ready = self.ready = True
self.clear_cache()
def clear_cache(self):
"""
Clear all internal caches, for methods that alter the app registry.
This is mostly used in tests.
"""
# Call expire cache on each model. This will purge
# the relation tree and the fields cache.
self.get_models.cache_clear()
if self.ready:
# Circumvent self.get_models() to prevent that the cache is refilled.
# This particularly prevents that an empty value is cached while cloning.
for app_config in self.app_configs.values():
for model in app_config.get_models(include_auto_created=True):
model._meta._expire_cache()
def lazy_model_operation(self, function, *model_keys):
"""
Take a function and a number of ("app_label", "modelname") tuples, and
when all the corresponding models have been imported and registered,
call the function with the model classes as its arguments.
The function passed to this method must accept exactly n models as
arguments, where n=len(model_keys).
"""
# Base case: no arguments, just execute the function.
if not model_keys:
function()
# Recursive case: take the head of model_keys, wait for the
# corresponding model class to be imported and registered, then apply
# that argument to the supplied function. Pass the resulting partial
# to lazy_model_operation() along with the remaining model args and
# repeat until all models are loaded and all arguments are applied.
else:
next_model, *more_models = model_keys
# This will be executed after the class corresponding to next_model
# has been imported and registered. The `func` attribute provides
# duck-type compatibility with partials.
def apply_next_model(model):
next_function = partial(apply_next_model.func, model)
self.lazy_model_operation(next_function, *more_models)
apply_next_model.func = function
# If the model has already been imported and registered, partially
# apply it to the function now. If not, add it to the list of
# pending operations for the model, where it will be executed with
# the model class as its sole argument once the model is ready.
try:
model_class = self.get_registered_model(*next_model)
except LookupError:
self._pending_operations[next_model].append(apply_next_model)
else:
apply_next_model(model_class)
def do_pending_operations(self, model):
"""
Take a newly-prepared model and pass it to each function waiting for
it. This is called at the very end of Apps.register_model().
"""
key = model._meta.app_label, model._meta.model_name
for function in self._pending_operations.pop(key, []):
function(model)
apps = Apps(installed_apps=None)