mirror of
https://github.com/ets-labs/python-dependency-injector.git
synced 2025-01-31 11:51:39 +03:00
247 lines
8.0 KiB
Python
247 lines
8.0 KiB
Python
"""Catalog module."""
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import six
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from .errors import Error
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from .utils import is_provider
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from .utils import is_catalog
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from .utils import ensure_is_catalog_bundle
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@six.python_2_unicode_compatible
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class CatalogBundle(object):
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"""Bundle of catalog providers."""
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catalog = None
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""":type: DeclarativeCatalog"""
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__IS_CATALOG_BUNDLE__ = True
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__slots__ = ('providers', '__dict__')
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def __init__(self, *providers):
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"""Initializer."""
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self.providers = dict((self.catalog.get_provider_bind_name(provider),
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provider)
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for provider in providers)
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self.__dict__.update(self.providers)
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super(CatalogBundle, self).__init__()
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def get(self, name):
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"""Return provider with specified name or raise an error."""
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try:
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return self.providers[name]
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except KeyError:
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self._raise_undefined_provider_error(name)
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def has(self, name):
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"""Check if there is provider with certain name."""
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return name in self.providers
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def _raise_undefined_provider_error(self, name):
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"""Raise error for cases when there is no such provider in bundle."""
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raise Error('Provider "{0}" is not a part of {1}'.format(name, self))
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def __getattr__(self, item):
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"""Raise an error on every attempt to get undefined provider."""
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if item.startswith('__') and item.endswith('__'):
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return super(CatalogBundle, self).__getattr__(item)
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self._raise_undefined_provider_error(item)
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def __repr__(self):
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"""Return string representation of catalog bundle."""
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return '<{0}.{1}.Bundle({2})>'.format(
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self.catalog.__module__, self.catalog.__name__,
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', '.join(six.iterkeys(self.providers)))
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__str__ = __repr__
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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 = dict((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 = dict((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 = dict()
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providers.update(cls_providers)
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providers.update(inherited_providers)
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cls = type.__new__(mcs, class_name, bases, attributes)
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cls.cls_providers = cls_providers
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cls.inherited_providers = inherited_providers
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cls.providers = providers
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cls.overridden_by = tuple()
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cls.Bundle = mcs.bundle_cls_factory(cls)
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cls.provider_names = dict()
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for name, provider in six.iteritems(providers):
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if provider in cls.provider_names:
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raise Error('Provider {0} could not be bound to the same '
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'catalog (or catalogs hierarchy) more '
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'than once'.format(provider))
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cls.provider_names[provider] = name
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return cls
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@classmethod
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def bundle_cls_factory(mcs, cls):
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"""Create bundle class for catalog."""
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return type('{0}Bundle', (CatalogBundle,), dict(catalog=cls))
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@property
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def is_overridden(cls):
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"""Check if catalog is overridden by another catalog."""
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return bool(cls.overridden_by)
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@property
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def last_overriding(cls):
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"""Return last overriding catalog."""
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try:
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return cls.overridden_by[-1]
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except (TypeError, IndexError):
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raise Error('Catalog {0} is not overridden'.format(str(cls)))
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def __repr__(cls):
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"""Return string representation of the catalog class."""
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return '<{0}.{1}>'.format(cls.__module__, cls.__name__)
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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 catalog of providers.
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:type Bundle: CatalogBundle
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:param Bundle: Catalog's bundle class
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:type providers: dict[str, dependency_injector.Provider]
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:param providers: Dict of all catalog providers, including inherited from
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parent catalogs
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:type provider_names: dict[dependency_injector.Provider, str]
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:param provider_names: Dict of all catalog providers, including inherited
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from parent catalogs
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:type cls_providers: dict[str, dependency_injector.Provider]
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:param cls_providers: Dict of current catalog providers
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:type inherited_providers: dict[str, dependency_injector.Provider]
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:param inherited_providers: Dict of providers, that are inherited from
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parent catalogs
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:type overridden_by: tuple[DeclarativeCatalog]
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:param overridden_by: Tuple of overriding catalogs
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:type is_overridden: bool
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:param is_overridden: Read-only, evaluated in runtime, property that is
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set to True if catalog is overridden
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:type last_overriding: DeclarativeCatalog | None
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:param last_overriding: Reference to the last overriding catalog, if any
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"""
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Bundle = CatalogBundle
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cls_providers = dict()
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inherited_providers = dict()
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providers = dict()
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provider_names = 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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__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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return ensure_is_catalog_bundle(bundle) and bundle.catalog is cls
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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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if not cls.is_provider_bound(provider):
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raise Error('Can not find bind name for {0} in catalog {1}'.format(
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provider, cls))
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return cls.provider_names[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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return provider in cls.provider_names
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@classmethod
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def filter(cls, provider_type):
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"""Return dict of providers, that are instance of provided type."""
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return dict((name, provider)
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for name, provider in six.iteritems(cls.providers)
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if isinstance(provider, 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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:type overriding: DeclarativeCatalog
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"""
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cls.overridden_by += (overriding,)
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for name, provider in six.iteritems(overriding.cls_providers):
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cls.providers[name].override(provider)
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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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if not cls.is_overridden:
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raise Error('Catalog {0} is not overridden'.format(str(cls)))
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cls.overridden_by = cls.overridden_by[:-1]
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for provider in six.itervalues(cls.providers):
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provider.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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cls.overridden_by = tuple()
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for provider in six.itervalues(cls.providers):
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provider.reset_override()
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@classmethod
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def get(cls, name):
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"""Return provider with specified name or raises error."""
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try:
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return cls.providers[name]
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except KeyError:
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raise Error('{0} has no provider with such name - {1}'.format(
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cls, name))
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@classmethod
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def has(cls, name):
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"""Check if there is provider with certain name."""
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return name in cls.providers
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# Backward compatibility for versions < 0.11.*
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AbstractCatalog = DeclarativeCatalog
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def override(catalog):
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"""Catalog overriding decorator."""
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def decorator(overriding_catalog):
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"""Overriding decorator."""
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catalog.override(overriding_catalog)
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return overriding_catalog
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return decorator
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