mirror of
https://github.com/ets-labs/python-dependency-injector.git
synced 2024-11-23 18:13:56 +03:00
452 lines
13 KiB
Python
452 lines
13 KiB
Python
"""Dependency injector declarative catalog module."""
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import six
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from dependency_injector.catalogs.dynamic import DynamicCatalog
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from dependency_injector.catalogs.bundle import CatalogBundle
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from dependency_injector.utils import (
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is_provider,
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is_catalog,
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is_declarative_catalog,
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)
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from dependency_injector.errors import (
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Error,
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UndefinedProviderError,
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)
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@six.python_2_unicode_compatible
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class DeclarativeCatalogMetaClass(type):
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"""Declarative catalog meta class."""
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def __new__(mcs, class_name, bases, attributes):
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"""Declarative catalog class factory."""
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cls_providers = tuple((name, provider)
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for name, provider in six.iteritems(attributes)
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if is_provider(provider))
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inherited_providers = tuple((name, provider)
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for base in bases if is_catalog(base)
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for name, provider in six.iteritems(
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base.providers))
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providers = cls_providers + inherited_providers
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cls = type.__new__(mcs, class_name, bases, attributes)
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if cls.provider_type:
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cls._catalog = type('DynamicCatalog',
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(DynamicCatalog,),
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dict(provider_type=cls.provider_type))()
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else:
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cls._catalog = DynamicCatalog()
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cls._catalog.name = '.'.join((cls.__module__, cls.__name__))
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cls._catalog.bind_providers(dict(providers))
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cls.cls_providers = dict(cls_providers)
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cls.inherited_providers = dict(inherited_providers)
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cls.Bundle = cls._catalog.Bundle
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return cls
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@property
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def name(cls):
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"""Read-only property that represents catalog's name.
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Catalog's name is catalog's module + catalog's class name.
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:type: str
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"""
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return cls._catalog.name
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@property
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def providers(cls):
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"""Read-only dictionary of all providers.
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:type: dict[str, :py:class:`dependency_injector.providers.Provider`]
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"""
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return cls._catalog.providers
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@property
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def overridden_by(cls):
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"""Tuple of overriding catalogs.
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:type: tuple[
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:py:class:`DeclarativeCatalog` |
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:py:class:`DynamicCatalog`]
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"""
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return cls._catalog.overridden_by
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@property
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def is_overridden(cls):
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"""Read-only property that is set to ``True`` if catalog is overridden.
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:rtype: bool
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"""
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return cls._catalog.is_overridden
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@property
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def last_overriding(cls):
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"""Read-only reference to the last overriding catalog, if any.
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:type: :py:class:`DeclarativeCatalog` | :py:class:`DynamicCatalog` |
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None
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"""
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return cls._catalog.last_overriding
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def __getattr__(cls, name):
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"""Return provider with specified name or raise en error.
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:param name: Attribute's name.
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:type name: str
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:raise: :py:exc:`dependency_injector.errors.UndefinedProviderError`
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"""
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raise UndefinedProviderError('There is no provider "{0}" in '
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'catalog {1}'.format(name, cls))
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def __setattr__(cls, name, value):
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"""Handle setting of catalog attributes.
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Setting of attributes works as usual, but if value of attribute is
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provider, this provider will be bound to catalog.
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:param name: Attribute's name.
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:type name: str
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:param value: Attribute's value.
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:type value: :py:class:`dependency_injector.providers.Provider` |
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object
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:rtype: None
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"""
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if is_provider(value):
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setattr(cls._catalog, name, value)
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return super(DeclarativeCatalogMetaClass, cls).__setattr__(name, value)
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def __delattr__(cls, name):
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"""Handle deleting of catalog attibute.
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Deleting of attributes works as usual, but if value of attribute is
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provider, this provider will be unbound from catalog.
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:param name: Attribute's name.
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:type name: str
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:rtype: None
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"""
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if is_provider(getattr(cls, name)):
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delattr(cls._catalog, name)
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return super(DeclarativeCatalogMetaClass, cls).__delattr__(name)
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def __repr__(cls):
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"""Return string representation of the catalog.
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:rtype: str
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"""
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return '<{0}({1})>'.format(cls.name,
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', '.join(six.iterkeys(cls.providers)))
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__str__ = __repr__
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@six.add_metaclass(DeclarativeCatalogMetaClass)
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class DeclarativeCatalog(object):
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"""Declarative catalog of providers.
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:py:class:`DeclarativeCatalog` is a catalog of providers that could be
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defined in declarative manner. It should cover most of the cases when list
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of providers that would be included in catalog is deterministic (catalog
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will not change its structure in runtime).
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.. code-block:: python
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class Services(DeclarativeCatalog):
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auth = providers.Factory(AuthService)
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users = providers.Factory(UsersService)
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users_service = Services.users()
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.. py:attribute:: Bundle
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Catalog's bundle class.
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:type: :py:class:`CatalogBundle`
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.. py:attribute:: name
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Read-only property that represents catalog's name.
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Catalog's name is catalog's module + catalog's class name.
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:type: str
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.. py:attribute:: cls_providers
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Read-only dictionary of current catalog providers.
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:type: dict[str, :py:class:`dependency_injector.providers.Provider`]
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.. py:attribute:: inherited_providers
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Read-only dictionary of inherited providers.
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:type: dict[str, :py:class:`dependency_injector.providers.Provider`]
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.. py:attribute:: providers
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Read-only dictionary of all providers.
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:type: dict[str, :py:class:`dependency_injector.providers.Provider`]
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.. py:attribute:: overridden_by
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Tuple of overriding catalogs.
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:type: tuple[:py:class:`DeclarativeCatalog` |
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:py:class:`DynamicCatalog`]
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.. py:attribute:: is_overridden
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Read-only property that is set to ``True`` if catalog is overridden.
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:type: bool
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.. py:attribute:: is_overridden
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Read-only reference to the last overriding catalog, if any.
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:type: :py:class:`DeclarativeCatalog` | :py:class:`DynamicCatalog` |
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None
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.. py:attribute:: provider_type
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If provider type is defined, :py:class:`DeclarativeCatalog` checks that
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all of its providers are instances of
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:py:attr:`DeclarativeCatalog.provider_type`.
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:type: type | None
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"""
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Bundle = CatalogBundle
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name = str()
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cls_providers = dict()
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inherited_providers = dict()
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providers = dict()
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overridden_by = tuple()
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is_overridden = bool
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last_overriding = None
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provider_type = None
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_catalog = DynamicCatalog
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__IS_CATALOG__ = True
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@classmethod
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def is_bundle_owner(cls, bundle):
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"""Check if catalog is bundle owner.
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:param bundle: Catalog's bundle instance.
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:type bundle: :py:class:`CatalogBundle`
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:rtype: bool
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"""
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return cls._catalog.is_bundle_owner(bundle)
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@classmethod
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def get_provider_bind_name(cls, provider):
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"""Return provider's name in catalog.
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:param provider: Provider instance.
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:type provider: :py:class:`dependency_injector.providers.Provider`
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:raise: :py:exc:`dependency_injector.errors.UndefinedProviderError`
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:return: Provider's name.
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:rtype: str
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"""
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return cls._catalog.get_provider_bind_name(provider)
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@classmethod
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def is_provider_bound(cls, provider):
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"""Check if provider is bound to the catalog.
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:param provider: Provider instance.
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:type provider: :py:class:`dependency_injector.providers.Provider`
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:rtype: bool
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"""
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return cls._catalog.is_provider_bound(provider)
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@classmethod
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def filter(cls, provider_type):
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"""Return dictionary of providers, that are instance of provided type.
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:param provider_type: Provider's type.
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:type provider_type: :py:class:`dependency_injector.providers.Provider`
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:rtype: dict[str, :py:class:`dependency_injector.providers.Provider`]
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"""
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return cls._catalog.filter(provider_type)
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@classmethod
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def override(cls, overriding):
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"""Override current catalog providers by overriding catalog providers.
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:param overriding: Overriding catalog.
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:type overriding: :py:class:`DeclarativeCatalog` |
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:py:class:`DynamicCatalog`
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:raise: :py:exc:`dependency_injector.errors.Error` if trying to
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override catalog by itself or its subclasses
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:rtype: None
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"""
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if is_declarative_catalog(overriding) and issubclass(cls, overriding):
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raise Error('Catalog {0} could not be overridden '
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'with itself or its subclasses'.format(cls))
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return cls._catalog.override(overriding)
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@classmethod
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def reset_last_overriding(cls):
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"""Reset last overriding catalog.
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:rtype: None
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"""
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cls._catalog.reset_last_overriding()
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@classmethod
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def reset_override(cls):
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"""Reset all overridings for all catalog providers.
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:rtype: None
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"""
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cls._catalog.reset_override()
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@classmethod
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def get_provider(cls, name):
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"""Return provider with specified name or raise an error.
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:param name: Provider's name.
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:type name: str
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:raise: :py:exc:`dependency_injector.errors.UndefinedProviderError`
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:return: Provider with specified name.
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:rtype: :py:class:`dependency_injector.providers.Provider`
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"""
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return cls._catalog.get_provider(name)
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get = get_provider # Backward compatibility for versions < 0.11.*
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@classmethod
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def bind_provider(cls, name, provider):
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"""Bind provider to catalog with specified name.
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:param name: Name of the provider.
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:type name: str
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:param provider: Provider instance.
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:type provider: :py:class:`dependency_injector.providers.Provider`
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:raise: :py:exc:`dependency_injector.errors.Error`
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:rtype: None
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"""
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setattr(cls, name, provider)
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@classmethod
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def bind_providers(cls, providers):
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"""Bind providers dictionary to catalog.
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:param providers: Dictionary of providers, where key is a name
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and value is a provider.
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:type providers:
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dict[str, :py:class:`dependency_injector.providers.Provider`]
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:raise: :py:exc:`dependency_injector.errors.Error`
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:rtype: None
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"""
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for name, provider in six.iteritems(providers):
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setattr(cls, name, provider)
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@classmethod
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def has_provider(cls, name):
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"""Check if there is provider with certain name.
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:param name: Provider's name.
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:type name: str
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:rtype: bool
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"""
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return hasattr(cls, name)
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has = has_provider # Backward compatibility for versions < 0.11.*
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@classmethod
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def unbind_provider(cls, name):
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"""Remove provider binding.
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:param name: Provider's name.
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:type name: str
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:rtype: None
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"""
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delattr(cls, name)
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@classmethod
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def __getattr__(cls, name): # pragma: no cover
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"""Return provider with specified name or raise en error.
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:param name: Attribute's name.
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:type name: str
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:raise: :py:exc:`dependency_injector.errors.UndefinedProviderError`
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"""
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raise NotImplementedError('Implementated in metaclass')
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@classmethod
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def __setattr__(cls, name, value): # pragma: no cover
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"""Handle setting of catalog attributes.
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Setting of attributes works as usual, but if value of attribute is
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provider, this provider will be bound to catalog.
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:param name: Attribute's name.
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:type name: str
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:param value: Attribute's value.
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:type value: :py:class:`dependency_injector.providers.Provider` |
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object
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:rtype: None
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"""
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raise NotImplementedError('Implementated in metaclass')
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@classmethod
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def __delattr__(cls, name): # pragma: no cover
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"""Handle deleting of catalog attibute.
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Deleting of attributes works as usual, but if value of attribute is
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provider, this provider will be unbound from catalog.
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:param name: Attribute's name.
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:type name: str
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:rtype: None
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"""
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raise NotImplementedError('Implementated in metaclass')
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# Backward compatibility for versions < 0.11.*
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AbstractCatalog = DeclarativeCatalog
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