mirror of
https://github.com/ets-labs/python-dependency-injector.git
synced 2024-11-26 03:23:58 +03:00
334 lines
11 KiB
Python
334 lines
11 KiB
Python
"""Catalog module."""
|
|
|
|
import six
|
|
|
|
from .errors import Error
|
|
|
|
from .utils import is_provider
|
|
from .utils import is_catalog
|
|
from .utils import ensure_is_provider
|
|
from .utils import ensure_is_catalog_bundle
|
|
|
|
|
|
@six.python_2_unicode_compatible
|
|
class DynamicCatalog(object):
|
|
"""Catalog of providers."""
|
|
|
|
__IS_CATALOG__ = True
|
|
__slots__ = ('name', 'Bundle', 'providers', 'provider_names',
|
|
'overridden_by')
|
|
|
|
def __init__(self, name, **providers):
|
|
"""Initializer.
|
|
|
|
:param name: Catalog's name
|
|
:type name: str
|
|
|
|
:param kwargs: Dict of providers with their catalog names
|
|
:type kwargs: dict[str, dependency_injector.providers.Provider]
|
|
"""
|
|
self.name = name
|
|
self.Bundle = CatalogBundle.sub_cls_factory(self)
|
|
self.providers = dict()
|
|
self.provider_names = dict()
|
|
for name, provider in six.iteritems(providers):
|
|
provider = ensure_is_provider(provider)
|
|
if provider in self.provider_names:
|
|
raise Error('Provider {0} could not be bound to the same '
|
|
'catalog (or catalogs hierarchy) more '
|
|
'than once'.format(provider))
|
|
self.provider_names[provider] = name
|
|
self.providers[name] = provider
|
|
self.overridden_by = tuple()
|
|
|
|
def is_bundle_owner(self, bundle):
|
|
"""Check if catalog is bundle owner."""
|
|
return ensure_is_catalog_bundle(bundle) and bundle.catalog is self
|
|
|
|
def get_provider_bind_name(self, provider):
|
|
"""Return provider's name in catalog."""
|
|
if not self.is_provider_bound(provider):
|
|
raise Error('Can not find bind name for {0} in catalog {1}'.format(
|
|
provider, self))
|
|
return self.provider_names[provider]
|
|
|
|
def is_provider_bound(self, provider):
|
|
"""Check if provider is bound to the catalog."""
|
|
return provider in self.provider_names
|
|
|
|
def filter(self, provider_type):
|
|
"""Return dict of providers, that are instance of provided type."""
|
|
return dict((name, provider)
|
|
for name, provider in six.iteritems(self.providers)
|
|
if isinstance(provider, provider_type))
|
|
|
|
@property
|
|
def is_overridden(self):
|
|
"""Check if catalog is overridden by another catalog."""
|
|
return bool(self.overridden_by)
|
|
|
|
@property
|
|
def last_overriding(self):
|
|
"""Return last overriding catalog."""
|
|
try:
|
|
return self.overridden_by[-1]
|
|
except (TypeError, IndexError):
|
|
raise Error('Catalog {0} is not overridden'.format(self))
|
|
|
|
def override(self, overriding):
|
|
"""Override current catalog providers by overriding catalog providers.
|
|
|
|
:type overriding: DynamicCatalog
|
|
"""
|
|
self.overridden_by += (overriding,)
|
|
for name, provider in six.iteritems(overriding.providers):
|
|
self.get(name).override(provider)
|
|
|
|
def reset_last_overriding(self):
|
|
"""Reset last overriding catalog."""
|
|
if not self.is_overridden:
|
|
raise Error('Catalog {0} is not overridden'.format(self))
|
|
self.overridden_by = self.overridden_by[:-1]
|
|
for provider in six.itervalues(self.providers):
|
|
provider.reset_last_overriding()
|
|
|
|
def reset_override(self):
|
|
"""Reset all overridings for all catalog providers."""
|
|
self.overridden_by = tuple()
|
|
for provider in six.itervalues(self.providers):
|
|
provider.reset_override()
|
|
|
|
def get(self, name):
|
|
"""Return provider with specified name or raise an error."""
|
|
try:
|
|
return self.providers[name]
|
|
except KeyError:
|
|
raise Error('{0} has no provider with such name - {1}'.format(
|
|
self, name))
|
|
|
|
def has(self, name):
|
|
"""Check if there is provider with certain name."""
|
|
return name in self.providers
|
|
|
|
def __repr__(self):
|
|
"""Return Python representation of catalog."""
|
|
return '<DynamicCatalog {0}>'.format(self.name)
|
|
|
|
__str__ = __repr__
|
|
|
|
|
|
@six.python_2_unicode_compatible
|
|
class CatalogBundle(object):
|
|
"""Bundle of catalog providers."""
|
|
|
|
catalog = None
|
|
""":type: DeclarativeCatalog"""
|
|
|
|
__IS_CATALOG_BUNDLE__ = True
|
|
__slots__ = ('providers', '__dict__')
|
|
|
|
def __init__(self, *providers):
|
|
"""Initializer."""
|
|
self.providers = dict((self.catalog.get_provider_bind_name(provider),
|
|
provider)
|
|
for provider in providers)
|
|
self.__dict__.update(self.providers)
|
|
super(CatalogBundle, self).__init__()
|
|
|
|
@classmethod
|
|
def sub_cls_factory(cls, catalog):
|
|
"""Create bundle class for catalog."""
|
|
return type('{0}Bundle'.format(catalog.name), (cls,),
|
|
dict(catalog=catalog))
|
|
|
|
def get(self, name):
|
|
"""Return provider with specified name or raise an error."""
|
|
try:
|
|
return self.providers[name]
|
|
except KeyError:
|
|
raise Error('Provider "{0}" is not a part of {1}'.format(name,
|
|
self))
|
|
|
|
def has(self, name):
|
|
"""Check if there is provider with certain name."""
|
|
return name in self.providers
|
|
|
|
def __getattr__(self, item):
|
|
"""Raise an error on every attempt to get undefined provider."""
|
|
if item.startswith('__') and item.endswith('__'):
|
|
return super(CatalogBundle, self).__getattr__(item)
|
|
raise Error('Provider "{0}" is not a part of {1}'.format(item, self))
|
|
|
|
def __repr__(self):
|
|
"""Return string representation of catalog bundle."""
|
|
return '<{0}.Bundle({1})>'.format(
|
|
self.catalog.name, ', '.join(six.iterkeys(self.providers)))
|
|
|
|
__str__ = __repr__
|
|
|
|
|
|
@six.python_2_unicode_compatible
|
|
class DeclarativeCatalogMetaClass(type):
|
|
"""Declarative catalog meta class."""
|
|
|
|
def __new__(mcs, class_name, bases, attributes):
|
|
"""Declarative catalog class factory."""
|
|
cls = type.__new__(mcs, class_name, bases, attributes)
|
|
|
|
cls_providers = tuple((name, provider)
|
|
for name, provider in six.iteritems(attributes)
|
|
if is_provider(provider))
|
|
|
|
inherited_providers = tuple((name, provider)
|
|
for base in bases if is_catalog(base)
|
|
for name, provider in six.iteritems(
|
|
base.providers))
|
|
|
|
providers = cls_providers + inherited_providers
|
|
|
|
cls.name = '.'.join((cls.__module__, cls.__name__))
|
|
cls.catalog = DynamicCatalog(cls.name, **dict(providers))
|
|
cls.Bundle = cls.catalog.Bundle
|
|
|
|
cls.cls_providers = dict(cls_providers)
|
|
cls.inherited_providers = dict(inherited_providers)
|
|
|
|
return cls
|
|
|
|
@property
|
|
def providers(cls):
|
|
"""Return dict of catalog's providers."""
|
|
return cls.catalog.providers
|
|
|
|
@property
|
|
def overridden_by(cls):
|
|
"""Return tuple of overriding catalogs."""
|
|
return cls.catalog.overridden_by
|
|
|
|
@property
|
|
def is_overridden(cls):
|
|
"""Check if catalog is overridden by another catalog."""
|
|
return cls.catalog.is_overridden
|
|
|
|
@property
|
|
def last_overriding(cls):
|
|
"""Return last overriding catalog."""
|
|
return cls.catalog.last_overriding
|
|
|
|
def __repr__(cls):
|
|
"""Return string representation of the catalog."""
|
|
return '<DeclarativeCatalog {0}>'.format(cls.name)
|
|
|
|
__str__ = __repr__
|
|
|
|
|
|
@six.add_metaclass(DeclarativeCatalogMetaClass)
|
|
class DeclarativeCatalog(object):
|
|
"""Declarative catalog catalog of providers.
|
|
|
|
:type name: str
|
|
:param name: Catalog's name
|
|
|
|
:type catalog: DynamicCatalog
|
|
:param catalog: Instance of dynamic catalog
|
|
|
|
:type Bundle: CatalogBundle
|
|
:param Bundle: Catalog's bundle class
|
|
|
|
:type providers: dict[str, dependency_injector.Provider]
|
|
:param providers: Dict of all catalog providers, including inherited from
|
|
parent catalogs
|
|
|
|
:type cls_providers: dict[str, dependency_injector.Provider]
|
|
:param cls_providers: Dict of current catalog providers
|
|
|
|
:type inherited_providers: dict[str, dependency_injector.Provider]
|
|
:param inherited_providers: Dict of providers, that are inherited from
|
|
parent catalogs
|
|
|
|
:type overridden_by: tuple[DeclarativeCatalog]
|
|
:param overridden_by: Tuple of overriding catalogs
|
|
|
|
:type is_overridden: bool
|
|
:param is_overridden: Read-only, evaluated in runtime, property that is
|
|
set to True if catalog is overridden
|
|
|
|
:type last_overriding: DeclarativeCatalog | None
|
|
:param last_overriding: Reference to the last overriding catalog, if any
|
|
"""
|
|
|
|
name = str()
|
|
catalog = DynamicCatalog
|
|
Bundle = CatalogBundle
|
|
|
|
cls_providers = dict()
|
|
inherited_providers = dict()
|
|
providers = dict()
|
|
|
|
overridden_by = tuple()
|
|
is_overridden = bool
|
|
last_overriding = None
|
|
|
|
__IS_CATALOG__ = True
|
|
|
|
@classmethod
|
|
def is_bundle_owner(cls, bundle):
|
|
"""Check if catalog is bundle owner."""
|
|
return cls.catalog.is_bundle_owner(bundle)
|
|
|
|
@classmethod
|
|
def get_provider_bind_name(cls, provider):
|
|
"""Return provider's name in catalog."""
|
|
return cls.catalog.get_provider_bind_name(provider)
|
|
|
|
@classmethod
|
|
def is_provider_bound(cls, provider):
|
|
"""Check if provider is bound to the catalog."""
|
|
return cls.catalog.is_provider_bound(provider)
|
|
|
|
@classmethod
|
|
def filter(cls, provider_type):
|
|
"""Return dict of providers, that are instance of provided type."""
|
|
return cls.catalog.filter(provider_type)
|
|
|
|
@classmethod
|
|
def override(cls, overriding):
|
|
"""Override current catalog providers by overriding catalog providers.
|
|
|
|
:type overriding: DeclarativeCatalog | DynamicCatalog
|
|
"""
|
|
cls.catalog.override(overriding)
|
|
|
|
@classmethod
|
|
def reset_last_overriding(cls):
|
|
"""Reset last overriding catalog."""
|
|
cls.catalog.reset_last_overriding()
|
|
|
|
@classmethod
|
|
def reset_override(cls):
|
|
"""Reset all overridings for all catalog providers."""
|
|
cls.catalog.reset_override()
|
|
|
|
@classmethod
|
|
def get(cls, name):
|
|
"""Return provider with specified name or raises error."""
|
|
return cls.catalog.get(name)
|
|
|
|
@classmethod
|
|
def has(cls, name):
|
|
"""Check if there is provider with certain name."""
|
|
return cls.catalog.has(name)
|
|
|
|
|
|
# Backward compatibility for versions < 0.11.*
|
|
AbstractCatalog = DeclarativeCatalog
|
|
|
|
|
|
def override(catalog):
|
|
"""Catalog overriding decorator."""
|
|
def decorator(overriding_catalog):
|
|
"""Overriding decorator."""
|
|
catalog.override(overriding_catalog)
|
|
return overriding_catalog
|
|
return decorator
|