mirror of
https://github.com/ets-labs/python-dependency-injector.git
synced 2024-11-22 09:36:48 +03:00
Remove @inject decorator
This commit is contained in:
Roman Mogilatov
parent
d1b1196d6d
commit
c8a5db7691
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@ -1,113 +0,0 @@
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"""Dependency injector injections module."""
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import warnings
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import six
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from dependency_injector.providers.base import (
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_parse_positional_injections,
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_parse_keyword_injections,
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)
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from dependency_injector import utils
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from dependency_injector import errors
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def inject(*args, **kwargs):
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"""Dependency injection decorator.
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.. warning::
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:py:func:`inject` decorator has been deprecated since version 2.2.0.
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Usage of :py:func:`inject` decorator can lead to bad design and could
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be considered as anti-pattern.
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:py:func:`inject` decorator can be used for making inline dependency
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injections. It patches decorated callable in such way that dependency
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injection will be done during every call of decorated callable.
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:py:func:`inject` decorator supports different syntaxes of passing
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injections:
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.. code-block:: python
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# Positional arguments injections:
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@inject(1, 2)
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def some_function(arg1, arg2):
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pass
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# Keyword arguments injections:
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@inject(arg1=1)
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@inject(arg2=2)
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def some_function(arg1, arg2):
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pass
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# Keyword arguments injections into class init:
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@inject(arg1=1)
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@inject(arg2=2)
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class SomeClass(object):
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def __init__(self, arg1, arg2):
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pass
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.. deprecated:: 2.2.0
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Usage of :py:func:`inject` decorator can lead to bad design and could
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be considered as anti-pattern.
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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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:return: Class / callable decorator
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:rtype: (callable) -> (type | callable)
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"""
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warnings.warn(message='Call to a deprecated decorator - @{0}.{1}'
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.format(inject.__module__, inject.__name__),
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category=DeprecationWarning,
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stacklevel=2)
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arg_injections = _parse_positional_injections(args)
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kwarg_injections = _parse_keyword_injections(kwargs)
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def decorator(callback_or_cls):
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"""Dependency injection decorator."""
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if isinstance(callback_or_cls, six.class_types):
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cls = callback_or_cls
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cls_init = utils.fetch_cls_init(cls)
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if not cls_init:
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raise errors.Error(
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'Class {0}.{1} has no __init__() '.format(cls.__module__,
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cls.__name__) +
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'method and could not be decorated with @inject decorator')
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cls.__init__ = decorator(cls_init)
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return cls
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callback = callback_or_cls
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if hasattr(callback, '__INJECT_DECORATED__'):
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callback.args += arg_injections
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callback.kwargs.update(kwarg_injections)
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return callback
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@six.wraps(callback)
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def decorated(*args, **kwargs):
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"""Decorated with dependency injection callback."""
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if decorated.args:
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args = tuple(arg.provide_injection()
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for arg in decorated.args) + args
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for name, arg in six.iteritems(decorated.kwargs):
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if name not in kwargs:
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kwargs[name] = arg.provide_injection()
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return callback(*args, **kwargs)
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decorated.__INJECT_DECORATED__ = True
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decorated.origin = callback
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decorated.args = arg_injections
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decorated.kwargs = kwarg_injections
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return decorated
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return decorator
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@ -1,6 +1,5 @@
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"""Dependency injector utils module."""
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import sys
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import copy as _copy
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import types
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import threading
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@ -16,12 +15,6 @@ GLOBAL_LOCK = threading.RLock()
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:type: :py:class:`threading.RLock`
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"""
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_IS_PYPY = '__pypy__' in sys.builtin_module_names
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if _IS_PYPY or six.PY3: # pragma: no cover
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_OBJECT_INIT = six.get_unbound_function(object.__init__)
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else: # pragma: no cover
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_OBJECT_INIT = None
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if six.PY2: # pragma: no cover
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_copy._deepcopy_dispatch[types.MethodType] = \
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lambda obj, memo: type(obj)(obj.im_func,
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@ -90,24 +83,6 @@ def represent_provider(provider, provides):
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address=hex(id(provider)))
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def fetch_cls_init(cls):
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"""Return reference to the class.__init__() method if it is defined.
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:param cls: Class instance
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:type cls: type
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:return: Reference to the class.__init__() if any, or None otherwise.
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:rtype: unbound method | None
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"""
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try:
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cls_init = six.get_unbound_function(cls.__init__)
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assert cls_init is not _OBJECT_INIT
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except (AttributeError, AssertionError):
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return None
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else:
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return cls_init
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def deepcopy(instance, memo=None):
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"""Make full copy of instance."""
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return _copy.deepcopy(instance, memo)
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@ -1,70 +0,0 @@
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Advanced usage
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==============
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Current section of documentation describes advanced usage of
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*Dependency Injector*.
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@inject decorator
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-----------------
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.. currentmodule:: dependency_injector.injections
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.. warning::
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:py:func:`inject` decorator has been deprecated since version 2.2.0.
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:py:func:`inject` decorator is a part of
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:py:mod:`dependency_injector.injections` module.
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:py:func:`inject` decorator can be used for making *inline* dependency
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injections. It *patches* decorated callable in such way that dependency
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injection will be done during every call of decorated callable.
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:py:func:`inject` takes a various number of positional and keyword arguments
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that are used as decorated callable injections. Every time, when
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:py:func:`inject` is called, positional and keyword argument injections would
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be passed as an callable arguments.
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Such behaviour is very similar to the standard Python ``functools.partial``
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object, except of one thing: all injectable values are provided
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*"as is"*, except of providers (subclasses of
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:py:class:`dependency_injector.providers.Provider`). Providers
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will be called every time, when injection needs to be done. For example,
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if injectable value of injection is a
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:py:class:`dependency_injector.providers.Factory`, it will provide new one
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instance (as a result of its call) every time, when injection needs to be done.
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:py:func:`inject` behaviour with context positional and keyword arguments is
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very like a standard Python ``functools.partial``:
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- Positional context arguments will be appended after :py:func:`inject`
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positional injections.
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- Keyword context arguments have priority on :py:func:`inject` keyword
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injections and will be merged over them.
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Example:
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.. literalinclude:: ../../examples/advanced_usage/inject_simple.py
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:language: python
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:linenos:
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Example of usage :py:func:`inject` decorator with Flask:
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.. literalinclude:: ../../examples/advanced_usage/inject_flask.py
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:language: python
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:linenos:
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@inject decorator with classes
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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:py:func:`inject` could be applied for classes. In such case, it will look for
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class ``__init__()`` method and pass injection to it. If decorated class has
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no ``__init__()`` method, appropriate
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:py:exc:`dependency_injector.errors.Error` will be raised.
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Example of usage :py:func:`inject` with Flask class-based view:
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.. literalinclude:: ../../examples/advanced_usage/inject_flask_class_based.py
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:language: python
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:linenos:
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@ -1,7 +0,0 @@
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``dependency_injector.injections``
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----------------------------------
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.. automodule:: dependency_injector.injections
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:members:
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:inherited-members:
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:show-inheritance:
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@ -9,7 +9,10 @@ follows `Semantic versioning`_
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Development version
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-------------------
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- No features.
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- Remove ``@inject`` decorator.
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.. - No features.
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2.2.10
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------
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@ -2,7 +2,7 @@
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import unittest2 as unittest
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from dependency_injector import providers, injections, utils, errors
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from dependency_injector import providers, utils, errors
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class Example(object):
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@ -731,26 +731,6 @@ class DelegatedThreadLocalSingletonTests(unittest.TestCase):
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class FactoryAsDecoratorTests(unittest.TestCase):
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"""Factory as decorator tests."""
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def test_decoration(self):
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"""Test decoration of some class with Factory provider."""
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@providers.Factory
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class AuthService(object):
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"""Auth service."""
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@providers.Factory
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@injections.inject(auth_service=AuthService)
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class UsersService(object):
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"""Users service."""
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def __init__(self, auth_service):
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"""Initializer."""
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self.auth_service = auth_service
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users_service = UsersService()
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self.assertIsInstance(users_service, UsersService.cls)
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self.assertIsInstance(users_service.auth_service, AuthService.cls)
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def test_decoration_and_overriding(self):
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"""Test decoration of some class with Factory provider."""
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@providers.Factory
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@ -1,202 +0,0 @@
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"""Dependency injector injections unittests."""
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import warnings
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import unittest2 as unittest
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from dependency_injector import injections
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from dependency_injector import providers
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from dependency_injector import errors
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class InjectTests(unittest.TestCase):
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"""Inject decorator test cases."""
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def test_decorated_args(self):
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"""Test `inject()` decoration with args."""
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provider1 = providers.Factory(object)
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provider2 = providers.Factory(list)
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@injections.inject(provider1, provider2)
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def test(a, b):
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return a, b
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a1, b1 = test()
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a2, b2 = test()
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self.assertIsInstance(a1, object)
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self.assertIsInstance(a2, object)
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self.assertIsNot(a1, a2)
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self.assertIsInstance(b1, list)
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self.assertIsInstance(b2, list)
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self.assertIsNot(b1, b2)
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def test_decorated_args_several_times(self):
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"""Test `inject()` decoration with args several times."""
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provider1 = providers.Factory(object)
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provider2 = providers.Factory(list)
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@injections.inject(provider2)
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@injections.inject(provider1)
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def test(a, b):
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return a, b
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a1, b1 = test()
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a2, b2 = test()
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self.assertIsInstance(a1, object)
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self.assertIsInstance(a2, object)
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self.assertIsNot(a1, a2)
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self.assertIsInstance(b1, list)
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self.assertIsInstance(b2, list)
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self.assertIsNot(b1, b2)
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def test_decorated_context_args(self):
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"""Test `inject()` decoration with context args."""
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provider1 = providers.Factory(object)
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provider2 = providers.Factory(list)
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@injections.inject(provider1)
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def test(a, b):
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return a, b
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a1, b1 = test(provider2())
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a2, b2 = test(provider2())
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self.assertIsInstance(a1, object)
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self.assertIsInstance(a2, object)
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self.assertIsNot(a1, a2)
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self.assertIsInstance(b1, list)
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self.assertIsInstance(b2, list)
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self.assertIsNot(b1, b2)
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def test_decorated_kwargs(self):
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"""Test `inject()` decoration with kwargs."""
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provider1 = providers.Factory(object)
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provider2 = providers.Factory(list)
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@injections.inject(a=provider1)
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@injections.inject(b=provider2)
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def test(a, b):
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return a, b
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a1, b1 = test()
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a2, b2 = test()
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self.assertIsInstance(a1, object)
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self.assertIsInstance(a2, object)
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self.assertIsNot(a1, a2)
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self.assertIsInstance(b1, list)
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self.assertIsInstance(b2, list)
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self.assertIsNot(b1, b2)
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def test_decorated_kwargs_priority(self):
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"""Test `inject()` decorated callback kwargs priority."""
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provider1 = providers.Factory(object)
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provider2 = providers.Factory(list)
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object_a = object()
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@injections.inject(a=provider1)
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@injections.inject(b=provider2)
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def test(a, b):
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return a, b
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a1, b1 = test(a=object_a)
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a2, b2 = test(a=object_a)
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self.assertIsInstance(a1, object)
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self.assertIsInstance(a2, object)
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self.assertIs(a1, object_a)
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self.assertIs(a2, object_a)
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self.assertIsInstance(b1, list)
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self.assertIsInstance(b2, list)
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self.assertIsNot(b1, b2)
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def test_decorated_with_args(self):
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"""Test `inject()` decorated callback with args."""
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provider = providers.Factory(list)
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object_a = object()
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@injections.inject(b=provider)
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def test(a, b):
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return a, b
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a1, b1 = test(object_a)
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a2, b2 = test(object_a)
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self.assertIsInstance(a1, object)
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self.assertIsInstance(a2, object)
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self.assertIs(a1, object_a)
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self.assertIs(a2, object_a)
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self.assertIsInstance(b1, list)
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self.assertIsInstance(b2, list)
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self.assertIsNot(b1, b2)
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def test_decorate_class_method(self):
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"""Test `inject()` decorator with class method."""
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class Test(object):
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"""Test class."""
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@injections.inject(arg1=123)
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@injections.inject(arg2=456)
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def some_method(self, arg1, arg2):
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"""Some test method."""
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return arg1, arg2
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test_object = Test()
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arg1, arg2 = test_object.some_method()
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self.assertEquals(arg1, 123)
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self.assertEquals(arg2, 456)
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def test_decorate_class_with_init(self):
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"""Test `inject()` decorator that decorate class with __init__."""
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@injections.inject(arg1=123)
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@injections.inject(arg2=456)
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class Test(object):
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"""Test class."""
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def __init__(self, arg1, arg2):
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"""Init."""
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self.arg1 = arg1
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self.arg2 = arg2
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test_object = Test()
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self.assertEquals(test_object.arg1, 123)
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self.assertEquals(test_object.arg2, 456)
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def test_decorate_class_without_init(self):
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"""Test `inject()` decorator that decorate class without __init__."""
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with self.assertRaises(errors.Error):
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@injections.inject(arg1=123)
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class Test(object):
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"""Test class."""
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class InjectDeprecationTests(unittest.TestCase):
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"""Deprecation of `@inject()` tests."""
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def test_deprecation_warning_on_usage(self):
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"""Test that DeprecationWarning is produced when `@inject` is used."""
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with warnings.catch_warnings(record=True) as caught_warnings:
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warnings.simplefilter('always')
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@injections.inject(1)
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def _example(arg):
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pass
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warnings.simplefilter('default')
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self.assertEquals(len(caught_warnings), 1)
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self.assertEquals(caught_warnings[-1].category, DeprecationWarning)
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self.assertIn('Call to a deprecated decorator',
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str(caught_warnings[-1].message))
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self.assertIn('@dependency_injector.injections.inject',
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str(caught_warnings[-1].message))
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