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Selector provider (#258)

Browse Source 
* Add Selector provider

* Add Selector provider example

* Add tests for selector provider

* Update changelog

* Add pydocstyle ignore D101 for examples

* Fix repr() test

* Update changelog

* Add D203,D213 to examples pydocstyle ignore

* Add selector provider docs
This commit is contained in:
Roman Mogylatov 2020-06-29 16:32:12 -04:00 committed by GitHub
parent 783be3ad36
commit 2513d1f600
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10 changed files with 5182 additions and 787 deletions
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5
docs/main/changelog.rst
View File

@ -7,6 +7,11 @@ that were made in every particular version.
From version 0.7.6 *Dependency Injector* framework strictly
follows `Semantic versioning`_
Development version
-------------------
- Add ``Selector`` provider.
- Fix ``Configuration.override()`` to return ``OverridingContext`` for non-dictionary values.
3.18.1
------
- Add interpolation of environment variables to ``Configuration.from_yaml()`` and

1
docs/providers/index.rst
View File

@ -24,6 +24,7 @@ Providers package API docs - :py:mod:`dependency_injector.providers`
object
list
configuration
selector
dependency
overriding
custom

31
docs/providers/selector.rst Normal file
View File

@ -0,0 +1,31 @@
Selector providers
------------------
.. currentmodule:: dependency_injector.providers
:py:class:`Selector` provider selects provider based on the configuration value or other callable.
.. literalinclude:: ../../examples/providers/selector.py
:language: python
:emphasize-lines: 6-10
:lines: 3-5,14-20
:linenos:
:py:class:`Selector` provider has a callable called ``selector`` and a dictionary of providers.
The ``selector`` callable is provided as a first positional argument. It can be
:py:class:`Configuration` provider or any other callable. It has to return a string value.
That value is used as a key for selecting the provider from the dictionary of providers.
The providers are provided as keyword arguments. Argument name is used as a key for
selecting the provider.
Full example:
.. literalinclude:: ../../examples/providers/selector.py
:language: python
:emphasize-lines: 14-18
:lines: 3-
:linenos:
.. disqus::

2
examples/.pydocstylerc Normal file
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@ -0,0 +1,2 @@
[pydocstyle]
ignore = D101,D203,D213

28
examples/providers/selector.py Normal file
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@ -0,0 +1,28 @@
"""`Selector` provider example."""
from dependency_injector import providers
class SomeClass:
...
class SomeOtherClass:
...
config = providers.Configuration()
selector = providers.Selector(
config.one_or_another,
one=providers.Factory(SomeClass),
another=providers.Factory(SomeOtherClass),
)
config.override({'one_or_another': 'one'})
instance_1 = selector()
assert isinstance(instance_1, SomeClass)
config.override({'one_or_another': 'another'})
instance_2 = selector()
assert isinstance(instance_2, SomeOtherClass)

229
src/dependency_injector/containers.c
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@ -846,6 +846,7 @@ struct __pyx_obj_19dependency_injector_9providers_AbstractSingleton;
struct __pyx_obj_19dependency_injector_9providers_SingletonDelegate;
struct __pyx_obj_19dependency_injector_9providers_List;
struct __pyx_obj_19dependency_injector_9providers_Container;
struct __pyx_obj_19dependency_injector_9providers_Selector;
struct __pyx_obj_19dependency_injector_9providers_Injection;
struct __pyx_obj_19dependency_injector_9providers_PositionalInjection;
struct __pyx_obj_19dependency_injector_9providers_NamedInjection;
@ -857,7 +858,7 @@ struct __pyx_obj_19dependency_injector_10containers___pyx_scope_struct_4_overrid
struct __pyx_obj_19dependency_injector_10containers___pyx_scope_struct_5_copy;
struct __pyx_opt_args_19dependency_injector_9providers_deepcopy;
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@ -1284,7 +1285,21 @@ struct __pyx_obj_19dependency_injector_9providers_Container {
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/* "providers.pxd":311
/* "providers.pxd":318
*
*
* cdef inline object __factory_call(Factory self, tuple args, dict kwargs): # <<<<<<<<<<<<<<

5417
src/dependency_injector/providers.c
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7
src/dependency_injector/providers.pxd
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@ -184,6 +184,13 @@ cdef class Container(Provider):
cpdef object _provide(self, tuple args, dict kwargs)
cdef class Selector(Provider):
cdef object __selector
cdef dict __providers
cpdef object _provide(self, tuple args, dict kwargs)
# Injections
cdef class Injection(object):
cdef object __value

99
src/dependency_injector/providers.pyx
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@ -1152,7 +1152,7 @@ cdef class Configuration(Object):
value = self.__call__()
if not isinstance(value, dict):
return
return overriding_context
for name in value.keys():
child_provider = self.__children.get(name)
@ -2267,6 +2267,103 @@ cdef class Container(Provider):
return self.container
cdef class Selector(Provider):
"""Selector provider selects provider based on the configuration value or other callable.
:py:class:`Selector` provider has a callable called ``selector`` and a dictionary of providers.
The ``selector`` callable is provided as a first positional argument. It can be
:py:class:`Configuration` provider or any other callable. It has to return a string value.
That value is used as a key for selecting the provider from the dictionary of providers.
The providers are provided as keyword arguments. Argument name is used as a key for
selecting the provider.
.. code-block:: python
config = Configuration()
selector = Selector(
config.one_or_another,
one=providers.Factory(SomeClass),
another=providers.Factory(SomeOtherClass),
)
config.override({'one_or_another': 'one'})
instance_1 = selector()
assert isinstance(instance_1, SomeClass)
config.override({'one_or_another': 'another'})
instance_2 = selector()
assert isinstance(instance_2, SomeOtherClass)
"""
def __init__(self, selector, **providers):
"""Initialize provider."""
self.__selector = selector
self.__providers = providers
super(Selector, self).__init__()
def __deepcopy__(self, memo):
"""Create and return full copy of provider."""
copied = memo.get(id(self))
if copied is not None:
return copied
copied = self.__class__(
deepcopy(self.__selector, memo),
**deepcopy(self.__providers, memo),
)
self._copy_overridings(copied, memo)
return copied
def __getattr__(self, name):
"""Return provider."""
if name.startswith('__') and name.endswith('__'):
raise AttributeError(
'\'{cls}\' object has no attribute '
'\'{attribute_name}\''.format(cls=self.__class__.__name__,
attribute_name=name))
if name not in self.__providers:
raise AttributeError('Selector has no "{0}" provider'.format(name))
return self.__providers[name]
def __str__(self):
"""Return string representation of provider.
:rtype: str
"""
return '<{provider}({selector}, {providers}) at {address}>'.format(
provider='.'.join(( self.__class__.__module__, self.__class__.__name__)),
selector=self.__selector,
providers=', '.join((
'{0}={1}'.format(name, provider)
for name, provider in self.__providers.items()
)),
address=hex(id(self)),
)
@property
def providers(self):
"""Return providers."""
return dict(self.__providers)
cpdef object _provide(self, tuple args, dict kwargs):
"""Return single instance."""
selector_value = self.__selector()
if selector_value is None:
raise Error('Selector value is undefined')
if selector_value not in self.__providers:
raise Error('Selector has no "{0}" provider'.format(selector_value))
return self.__providers[selector_value](*args, **kwargs)
cdef class Injection(object):
"""Abstract injection class."""

150
tests/unit/providers/test_selector_py2_py3.py Normal file
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@ -0,0 +1,150 @@
"""Dependency injector selector provider unit tests."""
import functools
import itertools
import sys
import unittest2 as unittest
from dependency_injector import providers
class SelectorTests(unittest.TestCase):
selector = providers.Configuration()
def test_is_provider(self):
self.assertTrue(providers.is_provider(providers.Selector(self.selector)))
def test_call(self):
provider = providers.Selector(
self.selector,
one=providers.Object(1),
two=providers.Object(2),
)
with self.selector.override('one'):
self.assertEqual(provider(), 1)
with self.selector.override('two'):
self.assertEqual(provider(), 2)
def test_call_any_callable(self):
provider = providers.Selector(
functools.partial(next, itertools.cycle(['one', 'two'])),
one=providers.Object(1),
two=providers.Object(2),
)
self.assertEqual(provider(), 1)
self.assertEqual(provider(), 2)
self.assertEqual(provider(), 1)
self.assertEqual(provider(), 2)
def test_call_with_context_args(self):
provider = providers.Selector(
self.selector,
one=providers.Callable(lambda *args, **kwargs: (args, kwargs)),
)
with self.selector.override('one'):
args, kwargs = provider(1, 2, three=3, four=4)
self.assertEqual(args, (1, 2))
self.assertEqual(kwargs, {'three': 3, 'four': 4})
def test_getattr(self):
provider_one = providers.Object(1)
provider_two = providers.Object(2)
provider = providers.Selector(
self.selector,
one=provider_one,
two=provider_two,
)
self.assertIs(provider.one, provider_one)
self.assertIs(provider.two, provider_two)
def test_call_overridden(self):
provider = providers.Selector(self.selector, sample=providers.Object(1))
overriding_provider1 = providers.Selector(self.selector, sample=providers.Object(2))
overriding_provider2 = providers.Selector(self.selector, sample=providers.Object(3))
provider.override(overriding_provider1)
provider.override(overriding_provider2)
with self.selector.override('sample'):
self.assertEqual(provider(), 3)
def test_deepcopy(self):
provider = providers.Selector(self.selector)
provider_copy = providers.deepcopy(provider)
self.assertIsNot(provider, provider_copy)
self.assertIsInstance(provider, providers.Selector)
def test_deepcopy_from_memo(self):
provider = providers.Selector(self.selector)
provider_copy_memo = providers.Selector(self.selector)
provider_copy = providers.deepcopy(
provider,
memo={id(provider): provider_copy_memo},
)
self.assertIs(provider_copy, provider_copy_memo)
def test_deepcopy_overridden(self):
provider = providers.Selector(self.selector)
object_provider = providers.Object(object())
provider.override(object_provider)
provider_copy = providers.deepcopy(provider)
object_provider_copy = provider_copy.overridden[0]
self.assertIsNot(provider, provider_copy)
self.assertIsInstance(provider, providers.Selector)
self.assertIsNot(object_provider, object_provider_copy)
self.assertIsInstance(object_provider_copy, providers.Object)
def test_deepcopy_with_sys_streams(self):
provider = providers.Selector(
self.selector,
stdin=providers.Object(sys.stdin),
stdout=providers.Object(sys.stdout),
stderr=providers.Object(sys.stderr),
)
provider_copy = providers.deepcopy(provider)
self.assertIsNot(provider, provider_copy)
self.assertIsInstance(provider_copy, providers.Selector)
with self.selector.override('stdin'):
self.assertIs(provider(), sys.stdin)
with self.selector.override('stdout'):
self.assertIs(provider(), sys.stdout)
with self.selector.override('stderr'):
self.assertIs(provider(), sys.stderr)
def test_repr(self):
provider = providers.Selector(
self.selector,
one=providers.Object(1),
two=providers.Object(2),
)
self.assertIn(
'<dependency_injector.providers.Selector({0}'.format(repr(self.selector)),
repr(provider),
)
self.assertIn('one={0}'.format(repr(provider.one)), repr(provider))
self.assertIn('two={0}'.format(repr(provider.two)), repr(provider))
self.assertIn('at {0}'.format(hex(id(provider))), repr(provider))