mirror of
https://github.com/ets-labs/python-dependency-injector.git
synced 2024-11-29 13:04:02 +03:00
114 lines
3.0 KiB
Python
114 lines
3.0 KiB
Python
"""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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import six
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from dependency_injector import errors
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GLOBAL_LOCK = threading.RLock()
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"""Dependency injector global reentrant lock.
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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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_copy.deepcopy(obj.im_self, memo),
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obj.im_class)
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def is_provider(instance):
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"""Check if instance is provider instance.
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:param instance: Instance to be checked.
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:type instance: object
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:rtype: bool
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"""
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return (not isinstance(instance, six.class_types) and
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hasattr(instance, '__IS_PROVIDER__') and
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getattr(instance, '__IS_PROVIDER__') is True)
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def ensure_is_provider(instance):
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"""Check if instance is provider instance and return it.
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:param instance: Instance to be checked.
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:type instance: object
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:raise: :py:exc:`dependency_injector.errors.Error` if provided instance is
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not provider.
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:rtype: :py:class:`dependency_injector.providers.Provider`
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"""
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if not is_provider(instance):
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raise errors.Error('Expected provider instance, '
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'got {0}'.format(str(instance)))
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return instance
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def is_container(instance):
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"""Check if instance is container instance.
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:param instance: Instance to be checked.
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:type instance: object
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:rtype: bool
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"""
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return (hasattr(instance, '__IS_CONTAINER__') and
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getattr(instance, '__IS_CONTAINER__', False) is True)
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def represent_provider(provider, provides):
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"""Return string representation of provider.
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:param provider: Provider object
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:type provider: :py:class:`dependency_injector.providers.Provider`
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:param provides: Object that provider provides
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:type provider: object
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:return: String representation of provider
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:rtype: str
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"""
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return '<{provider}({provides}) at {address}>'.format(
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provider='.'.join((provider.__class__.__module__,
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provider.__class__.__name__)),
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provides=repr(provides) if provides is not None else '',
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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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