mirror of
https://github.com/ets-labs/python-dependency-injector.git
synced 2024-11-25 02:53:56 +03:00
Make some refactorings for providers
This commit is contained in:
Roman Mogilatov
parent
10e76f65d7
commit
f3668ed815
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@ -56,6 +56,12 @@ class Provider(object):
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assert provider is delegated
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All providers should extend this class.
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.. py:attribute:: overridden_by
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Tuple of overriding providers, if any.
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:type: tuple[:py:class:`Provider`] | None
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"""
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__IS_PROVIDER__ = True
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@ -64,11 +70,6 @@ class Provider(object):
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def __init__(self):
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"""Initializer."""
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self.overridden_by = None
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"""Tuple of overriding providers, if any.
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:type: tuple[:py:class:`Provider`] | None
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"""
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super(Provider, self).__init__()
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def __call__(self, *args, **kwargs):
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@ -174,6 +175,12 @@ class Delegate(Provider):
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delegated = delegate()
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assert provider is delegated
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.. py:attribute:: delegated
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Delegated provider.
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:type: :py:class:`Provider`
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"""
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__slots__ = ('delegated',)
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@ -185,11 +192,6 @@ class Delegate(Provider):
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:type delegated: :py:class:`Provider`
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"""
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self.delegated = ensure_is_provider(delegated)
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"""Delegated provider.
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:type: :py:class:`Provider`
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"""
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super(Delegate, self).__init__()
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def _provide(self, *args, **kwargs):
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@ -216,7 +218,108 @@ class Delegate(Provider):
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@six.python_2_unicode_compatible
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class Factory(Provider):
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class Callable(Provider):
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""":py:class:`Callable` provider calls wrapped callable on every call.
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:py:class:`Callable` provider provides callable that is called on every
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provider call with some predefined dependency injections.
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:py:class:`Callable` syntax of passing injections is the same like
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:py:class:`Factory` one:
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.. code-block:: python
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# simplified syntax for passing positional and keyword argument
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# injections:
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some_function = Callable(some_function, 'arg1', 'arg2', arg3=3, arg4=4)
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# extended (full) syntax for passing positional and keyword argument
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# injections:
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some_function = Callable(some_function,
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injections.Arg(1),
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injections.Arg(2),
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injections.KwArg('some_arg', 3),
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injections.KwArg('other_arg', 4))
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.. py:attribute:: provides
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Provided callable.
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:type: callable
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.. py:attribute:: args
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Tuple of positional argument injections.
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:type: tuple[:py:class:`dependency_injector.injections.Arg`]
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.. py:attribute:: kwargs
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Tuple of keyword argument injections.
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:type: tuple[:py:class:`dependency_injector.injections.KwArg`]
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"""
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__slots__ = ('provides', 'args', 'kwargs')
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def __init__(self, provides, *args, **kwargs):
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"""Initializer.
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:param provides: Wrapped callable.
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:type provides: callable
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:param args: Tuple of injections.
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:type args: tuple
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:param kwargs: Dictionary of injections.
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:type kwargs: dict
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"""
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if not callable(provides):
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raise Error('Provider{0} expected to get callable, '
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'got {0}'.format('.'.join((self.__class__.__module__,
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self.__class__.__name__)),
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provides))
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self.provides = provides
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self.args = _parse_args_injections(args)
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self.kwargs = _parse_kwargs_injections(args, kwargs)
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super(Callable, self).__init__()
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@property
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def injections(self):
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"""Read-only tuple of all injections.
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:rtype: tuple[:py:class:`dependency_injector.injections.Injection`]
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"""
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return self.args + self.kwargs
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def _provide(self, *args, **kwargs):
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"""Return provided instance.
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:param args: Tuple of context positional arguments.
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:type args: tuple[object]
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:param kwargs: Dictionary of context keyword arguments.
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:type kwargs: dict[str, object]
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:rtype: object
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"""
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return self.provides(*_get_injectable_args(args, self.args),
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**_get_injectable_kwargs(kwargs, self.kwargs))
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def __str__(self):
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"""Return string representation of provider.
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:rtype: str
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"""
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return represent_provider(provider=self, provides=self.provides)
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__repr__ = __str__
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class Factory(Callable):
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""":py:class:`Factory` provider creates new instance on every call.
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:py:class:`Factory` supports different syntaxes of passing injections:
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@ -244,19 +347,49 @@ class Factory(Provider):
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some_arg1=1,
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some_arg2=2)
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some_object = factory()
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"""
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provided_type = None
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"""Provided type.
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.. py:attribute:: provided_type
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If provided type is defined, :py:class:`Factory` checks that
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:py:attr:`Factory.provides` is subclass of
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:py:attr:`Factory.provided_type`.
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:type: type | None
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.. py:attribute:: provides
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Class or other callable that provides object.
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:type: type | callable
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.. py:attribute:: args
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Tuple of positional argument injections.
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:type: tuple[:py:class:`dependency_injector.injections.Arg`]
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.. py:attribute:: kwargs
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Tuple of keyword argument injections.
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:type: tuple[:py:class:`dependency_injector.injections.KwArg`]
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.. py:attribute:: attributes
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Tuple of attribute injections.
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:type: tuple[:py:class:`dependency_injector.injections.Attribute`]
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.. py:attribute:: methods
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Tuple of method injections.
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:type: tuple[:py:class:`dependency_injector.injections.Method`]
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"""
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__slots__ = ('provides', 'args', 'kwargs', 'attributes', 'methods')
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provided_type = None
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__slots__ = ('attributes', 'methods')
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def __init__(self, provides, *args, **kwargs):
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"""Initializer.
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@ -271,41 +404,22 @@ class Factory(Provider):
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:param kwargs: Dictionary of injections.
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:type kwargs: dict
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"""
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self.provides = self._ensure_provides_type(provides)
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"""Class or other callable that provides object for creation.
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:type: type | callable
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"""
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self.args = _parse_args_injections(args)
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"""Tuple of positional argument injections.
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:type: tuple[:py:class:`dependency_injector.injections.Arg`]
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"""
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self.kwargs = _parse_kwargs_injections(args, kwargs)
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"""Tuple of keyword argument injections.
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:type: tuple[:py:class:`dependency_injector.injections.KwArg`]
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"""
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if (self.__class__.provided_type and
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not issubclass(provides, self.__class__.provided_type)):
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raise Error('{0} can provide only {1} instances'.format(
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'.'.join((self.__class__.__module__,
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self.__class__.__name__)),
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self.__class__.provided_type))
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self.attributes = tuple(injection
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for injection in args
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if is_attribute_injection(injection))
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"""Tuple of attribute injections.
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:type: tuple[:py:class:`dependency_injector.injections.Attribute`]
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"""
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self.methods = tuple(injection
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for injection in args
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if is_method_injection(injection))
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"""Tuple of method injections.
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:type: tuple[:py:class:`dependency_injector.injections.Method`]
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"""
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super(Factory, self).__init__()
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super(Factory, self).__init__(provides, *args, **kwargs)
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@property
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def injections(self):
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@ -326,8 +440,8 @@ class Factory(Provider):
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:rtype: object
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"""
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instance = self.provides(*_get_injectable_args(args, self.args),
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**_get_injectable_kwargs(kwargs, self.kwargs))
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instance = super(Factory, self)._provide(*args, **kwargs)
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for attribute in self.attributes:
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setattr(instance, attribute.name, attribute.value)
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for method in self.methods:
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@ -335,49 +449,13 @@ class Factory(Provider):
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return instance
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def _ensure_provides_type(self, provides):
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"""Check if provided type is valid type for this factory.
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:param provides: Factory provided type
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:type provides: type
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:raise: :py:exc:`dependency_injector.errors.Error` if ``provides``
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is not callable
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:raise: :py:exc:`dependency_injector.errors.Error` if ``provides``
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doesn't meet factory provided type
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:return: validated ``provides``
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:rtype: type
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"""
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if not callable(provides):
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raise Error('Factory provider expects to get callable, ' +
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'got {0} instead'.format(str(provides)))
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if (self.__class__.provided_type and
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not issubclass(provides, self.__class__.provided_type)):
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raise Error('{0} can provide only {1} instances'.format(
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'.'.join((self.__class__.__module__,
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self.__class__.__name__)),
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self.__class__.provided_type))
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return provides
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def __str__(self):
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"""Return string representation of provider.
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:rtype: str
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"""
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return represent_provider(provider=self, provides=self.provides)
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__repr__ = __str__
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@six.python_2_unicode_compatible
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class Singleton(Provider):
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class Singleton(Factory):
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""":py:class:`Singleton` provider returns same instance on every call.
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:py:class:`Singleton` provider creates instance once and return it on every
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call. :py:class:`Singleton` uses :py:class:`Factory` for creation of
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instance, so, please follow :py:class:`Factory` documentation to go inside
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with injections syntax.
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call. :py:class:`Singleton` extends :py:class:`Factory`, so, please follow
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:py:class:`Factory` documentation to go inside with injections syntax.
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:py:class:`Singleton` is thread-safe and could be used in multithreading
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environment without any negative impact.
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@ -392,9 +470,52 @@ class Singleton(Provider):
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some_arg2=2)
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some_object = singleton()
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.. py:attribute:: provided_type
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If provided type is defined, :py:class:`Factory` checks that
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:py:attr:`Factory.provides` is subclass of
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:py:attr:`Factory.provided_type`.
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:type: type | None
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.. py:attribute:: instance
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Read-only reference to singleton's instance.
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:type: object
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.. py:attribute:: provides
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Class or other callable that provides object.
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:type: type | callable
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.. py:attribute:: args
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Tuple of positional argument injections.
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:type: tuple[:py:class:`dependency_injector.injections.Arg`]
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.. py:attribute:: kwargs
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Tuple of keyword argument injections.
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:type: tuple[:py:class:`dependency_injector.injections.KwArg`]
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.. py:attribute:: attributes
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Tuple of attribute injections.
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:type: tuple[:py:class:`dependency_injector.injections.Attribute`]
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.. py:attribute:: methods
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Tuple of method injections.
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:type: tuple[:py:class:`dependency_injector.injections.Method`]
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"""
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__slots__ = ('instance', 'factory')
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__slots__ = ('instance',)
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def __init__(self, provides, *args, **kwargs):
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"""Initializer.
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@ -410,66 +531,7 @@ class Singleton(Provider):
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:type kwargs: dict
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"""
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self.instance = None
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"""Read-only reference to singleton's instance.
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:type: object
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"""
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self.factory = Factory(provides, *args, **kwargs)
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"""Singleton's factory object.
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:type: :py:class:`Factory`
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"""
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super(Singleton, self).__init__()
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@property
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def provides(self):
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"""Class or other callable that provides object for creation.
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:type: type | callable
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"""
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return self.factory.provides
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@property
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def args(self):
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"""Tuple of positional argument injections.
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:type: tuple[:py:class:`dependency_injector.injections.Arg`]
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"""
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return self.factory.args
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@property
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def kwargs(self):
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"""Tuple of keyword argument injections.
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:type: tuple[:py:class:`dependency_injector.injections.KwArg`]
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"""
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return self.factory.kwargs
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@property
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def attributes(self):
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"""Tuple of attribute injections.
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:type: tuple[:py:class:`dependency_injector.injections.Attribute`]
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"""
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return self.factory.attributes
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@property
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def methods(self):
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"""Tuple of method injections.
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:type: tuple[:py:class:`dependency_injector.injections.Method`]
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"""
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return self.factory.methods
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@property
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def injections(self):
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"""Read-only tuple of all injections.
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:rtype: tuple[:py:class:`dependency_injector.injections.Injection`]
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"""
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return self.factory.injections
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super(Singleton, self).__init__(provides, *args, **kwargs)
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def reset(self):
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"""Reset cached instance, if any.
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@ -491,103 +553,10 @@ class Singleton(Provider):
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"""
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with GLOBAL_LOCK:
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if not self.instance:
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self.instance = self.factory(*args, **kwargs)
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self.instance = super(Singleton, self)._provide(*args,
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**kwargs)
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return self.instance
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def __str__(self):
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"""Return string representation of provider.
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:rtype: str
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"""
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return represent_provider(provider=self, provides=self.provides)
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__repr__ = __str__
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@six.python_2_unicode_compatible
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class Callable(Provider):
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""":py:class:`Callable` provider calls wrapped callable on every call.
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|
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:py:class:`Callable` provider provides callable that is called on every
|
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provider call with some predefined dependency injections.
|
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|
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:py:class:`Callable` syntax of passing injections is the same like
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:py:class:`Factory` one:
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.. code-block:: python
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some_function = Callable(some_function, 'arg1', 'arg2', arg3=3, arg4=4)
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result = some_function()
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"""
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__slots__ = ('callback', 'args', 'kwargs')
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def __init__(self, callback, *args, **kwargs):
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"""Initializer.
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:param provides: Wrapped callable.
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:type provides: callable
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:param args: Tuple of injections.
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:type args: tuple
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:param kwargs: Dictionary of injections.
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:type kwargs: dict
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"""
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if not callable(callback):
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raise Error('Callable expected, got {0}'.format(str(callback)))
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self.callback = callback
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"""Provided callable.
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:type: callable
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"""
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self.args = _parse_args_injections(args)
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"""Tuple of positional argument injections.
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:type: tuple[:py:class:`dependency_injector.injections.Arg`]
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"""
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self.kwargs = _parse_kwargs_injections(args, kwargs)
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"""Tuple of keyword argument injections.
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:type: tuple[:py:class:`dependency_injector.injections.KwArg`]
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"""
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super(Callable, self).__init__()
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@property
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def injections(self):
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"""Read-only tuple of all injections.
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:rtype: tuple[:py:class:`dependency_injector.injections.Injection`]
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"""
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return self.args + self.kwargs
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def _provide(self, *args, **kwargs):
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"""Return provided instance.
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:param args: Tuple of context positional arguments.
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:type args: tuple[object]
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:param kwargs: Dictionary of context keyword arguments.
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:type kwargs: dict[str, object]
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:rtype: object
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"""
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return self.callback(*_get_injectable_args(args, self.args),
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**_get_injectable_kwargs(kwargs, self.kwargs))
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def __str__(self):
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||||
"""Return string representation of provider.
|
||||
|
||||
:rtype: str
|
||||
"""
|
||||
return represent_provider(provider=self, provides=self.callback)
|
||||
|
||||
__repr__ = __str__
|
||||
|
||||
|
||||
@six.python_2_unicode_compatible
|
||||
class ExternalDependency(Provider):
|
||||
|
|
@ -604,6 +573,12 @@ class ExternalDependency(Provider):
|
|||
database_provider.override(Factory(sqlite3.connect, ':memory:'))
|
||||
|
||||
database = database_provider()
|
||||
|
||||
.. py:attribute:: instance_of
|
||||
|
||||
Class of required dependency.
|
||||
|
||||
:type: type
|
||||
"""
|
||||
|
||||
__slots__ = ('instance_of',)
|
||||
|
|
@ -614,10 +589,6 @@ class ExternalDependency(Provider):
|
|||
raise Error('ExternalDependency provider expects to get class, ' +
|
||||
'got {0} instead'.format(str(instance_of)))
|
||||
self.instance_of = instance_of
|
||||
"""Class of required dependency.
|
||||
|
||||
:type: type
|
||||
"""
|
||||
super(ExternalDependency, self).__init__()
|
||||
|
||||
def __call__(self, *args, **kwargs):
|
||||
|
|
@ -670,6 +641,12 @@ class Static(Provider):
|
|||
|
||||
:py:class:`Static` provider is base implementation that provides exactly
|
||||
the same as it got on input.
|
||||
|
||||
.. py:attribute:: provides
|
||||
|
||||
Value that have to be provided.
|
||||
|
||||
:type: object
|
||||
"""
|
||||
|
||||
__slots__ = ('provides',)
|
||||
|
|
@ -681,10 +658,6 @@ class Static(Provider):
|
|||
:type provides: object
|
||||
"""
|
||||
self.provides = provides
|
||||
"""Value that have to be provided.
|
||||
|
||||
:type: object
|
||||
"""
|
||||
super(Static, self).__init__()
|
||||
|
||||
def _provide(self, *args, **kwargs):
|
||||
|
|
@ -847,17 +820,7 @@ class ChildConfig(Provider):
|
|||
:type root_config: :py:class:`Config`
|
||||
"""
|
||||
self.parents = parents
|
||||
"""Tuple of pieces of configuration option / section parent path.
|
||||
|
||||
:type: tuple[str]
|
||||
"""
|
||||
|
||||
self.root_config = root_config
|
||||
"""Root configuration object.
|
||||
|
||||
:type: :py:class:`Config`
|
||||
"""
|
||||
|
||||
super(ChildConfig, self).__init__()
|
||||
|
||||
def __getattr__(self, item):
|
||||
|
|
|
|||
|
|
@ -4,3 +4,4 @@
|
|||
.. automodule:: dependency_injector.providers
|
||||
:members:
|
||||
:inherited-members:
|
||||
:show-inheritance:
|
||||
|
|
|
|||
|
|
@ -11,6 +11,9 @@ Development version
|
|||
-------------------
|
||||
- Add possibility to validate ``Factory`` provided type on ``Factory``
|
||||
initialization.
|
||||
- Add possibility to validate ``Singleton`` provided type on ``Singleton``
|
||||
initialization.
|
||||
- Make some refactorings for providers.
|
||||
|
||||
1.11.2
|
||||
------
|
||||
|
|
|
|||
|
|
@ -176,44 +176,44 @@ class FactoryTests(unittest.TestCase):
|
|||
"""Test creation of provider with a callable."""
|
||||
self.assertTrue(providers.Factory(credits))
|
||||
|
||||
def test_init_with_not_callable(self):
|
||||
"""Test creation of provider with not a callable."""
|
||||
self.assertRaises(errors.Error, providers.Factory, 123)
|
||||
|
||||
def test_init_with_valid_provided_type(self):
|
||||
"""Test creation with not valid provided type."""
|
||||
class ExampleFactory(providers.Factory):
|
||||
"""Example factory."""
|
||||
class ExampleProvider(providers.Factory):
|
||||
"""Example provider."""
|
||||
|
||||
provided_type = Example
|
||||
|
||||
example_factory = ExampleFactory(Example, 1, 2)
|
||||
example_provider = ExampleProvider(Example, 1, 2)
|
||||
|
||||
self.assertIsInstance(example_factory(), Example)
|
||||
self.assertIsInstance(example_provider(), Example)
|
||||
|
||||
def test_init_with_valid_provided_subtype(self):
|
||||
"""Test creation with not valid provided type."""
|
||||
class ExampleFactory(providers.Factory):
|
||||
"""Example factory."""
|
||||
class ExampleProvider(providers.Factory):
|
||||
"""Example provider."""
|
||||
|
||||
provided_type = Example
|
||||
|
||||
class NewExampe(Example):
|
||||
"""Example class subclass."""
|
||||
|
||||
example_factory = ExampleFactory(NewExampe, 1, 2)
|
||||
example_provider = ExampleProvider(NewExampe, 1, 2)
|
||||
|
||||
self.assertIsInstance(example_factory(), NewExampe)
|
||||
self.assertIsInstance(example_provider(), NewExampe)
|
||||
|
||||
def test_init_with_invalid_provided_type(self):
|
||||
"""Test creation with not valid provided type."""
|
||||
class ExampleFactory(providers.Factory):
|
||||
"""Example factory."""
|
||||
class ExampleProvider(providers.Factory):
|
||||
"""Example provider."""
|
||||
|
||||
provided_type = Example
|
||||
|
||||
with self.assertRaises(errors.Error):
|
||||
ExampleFactory(list)
|
||||
|
||||
def test_init_with_not_callable(self):
|
||||
"""Test creation of provider with not a callable."""
|
||||
self.assertRaises(errors.Error, providers.Factory, 123)
|
||||
ExampleProvider(list)
|
||||
|
||||
def test_call(self):
|
||||
"""Test creation of new instances."""
|
||||
|
|
@ -434,6 +434,41 @@ class SingletonTests(unittest.TestCase):
|
|||
"""Test creation of provider with not a callable."""
|
||||
self.assertRaises(errors.Error, providers.Singleton, 123)
|
||||
|
||||
def test_init_with_valid_provided_type(self):
|
||||
"""Test creation with not valid provided type."""
|
||||
class ExampleProvider(providers.Singleton):
|
||||
"""Example provider."""
|
||||
|
||||
provided_type = Example
|
||||
|
||||
example_provider = ExampleProvider(Example, 1, 2)
|
||||
|
||||
self.assertIsInstance(example_provider(), Example)
|
||||
|
||||
def test_init_with_valid_provided_subtype(self):
|
||||
"""Test creation with not valid provided type."""
|
||||
class ExampleProvider(providers.Singleton):
|
||||
"""Example provider."""
|
||||
|
||||
provided_type = Example
|
||||
|
||||
class NewExampe(Example):
|
||||
"""Example class subclass."""
|
||||
|
||||
example_provider = ExampleProvider(NewExampe, 1, 2)
|
||||
|
||||
self.assertIsInstance(example_provider(), NewExampe)
|
||||
|
||||
def test_init_with_invalid_provided_type(self):
|
||||
"""Test creation with not valid provided type."""
|
||||
class ExampleProvider(providers.Singleton):
|
||||
"""Example provider."""
|
||||
|
||||
provided_type = Example
|
||||
|
||||
with self.assertRaises(errors.Error):
|
||||
ExampleProvider(list)
|
||||
|
||||
def test_call(self):
|
||||
"""Test getting of instances."""
|
||||
provider = providers.Singleton(Example)
|
||||
|
|
|
|||
Loading…
Reference in New Issue
Block a user