/usr/lib/python2.7/dist-packages/stevedore/named.py is in python-stevedore 1.12.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 | from .extension import ExtensionManager
class NamedExtensionManager(ExtensionManager):
"""Loads only the named extensions.
This is useful for explicitly enabling extensions in a
configuration file, for example.
:param namespace: The namespace for the entry points.
:type namespace: str
:param names: The names of the extensions to load.
:type names: list(str)
:param invoke_on_load: Boolean controlling whether to invoke the
object returned by the entry point after the driver is loaded.
:type invoke_on_load: bool
:param invoke_args: Positional arguments to pass when invoking
the object returned by the entry point. Only used if invoke_on_load
is True.
:type invoke_args: tuple
:param invoke_kwds: Named arguments to pass when invoking
the object returned by the entry point. Only used if invoke_on_load
is True.
:type invoke_kwds: dict
:param name_order: If true, sort the loaded extensions to match the
order used in ``names``.
:type name_order: bool
:param propagate_map_exceptions: Boolean controlling whether exceptions
are propagated up through the map call or whether they are logged and
then ignored
:type propagate_map_exceptions: bool
:param on_load_failure_callback: Callback function that will be called when
a entrypoint can not be loaded. The arguments that will be provided
when this is called (when an entrypoint fails to load) are
(manager, entrypoint, exception)
:type on_load_failure_callback: function
:param verify_requirements: Use setuptools to enforce the
dependencies of the plugin(s) being loaded. Defaults to False.
:type verify_requirements: bool
"""
def __init__(self, namespace, names,
invoke_on_load=False, invoke_args=(), invoke_kwds={},
name_order=False, propagate_map_exceptions=False,
on_load_failure_callback=None,
verify_requirements=False):
self._init_attributes(
namespace, names, name_order=name_order,
propagate_map_exceptions=propagate_map_exceptions,
on_load_failure_callback=on_load_failure_callback)
extensions = self._load_plugins(invoke_on_load,
invoke_args,
invoke_kwds,
verify_requirements)
self._init_plugins(extensions)
@classmethod
def make_test_instance(cls, extensions, namespace='TESTING',
propagate_map_exceptions=False,
on_load_failure_callback=None,
verify_requirements=False):
"""Construct a test NamedExtensionManager
Test instances are passed a list of extensions to use rather than
loading them from entry points.
:param extensions: Pre-configured Extension instances
:type extensions: list of :class:`~stevedore.extension.Extension`
:param namespace: The namespace for the manager; used only for
identification since the extensions are passed in.
:type namespace: str
:param propagate_map_exceptions: Boolean controlling whether exceptions
are propagated up through the map call or whether they are logged
and then ignored
:type propagate_map_exceptions: bool
:param on_load_failure_callback: Callback function that will
be called when a entrypoint can not be loaded. The
arguments that will be provided when this is called (when
an entrypoint fails to load) are (manager, entrypoint,
exception)
:type on_load_failure_callback: function
:param verify_requirements: Use setuptools to enforce the
dependencies of the plugin(s) being loaded. Defaults to False.
:type verify_requirements: bool
:return: The manager instance, initialized for testing
"""
o = cls.__new__(cls)
names = [e.name for e in extensions]
o._init_attributes(namespace, names,
propagate_map_exceptions=propagate_map_exceptions,
on_load_failure_callback=on_load_failure_callback)
o._init_plugins(extensions)
return o
def _init_attributes(self, namespace, names, name_order=False,
propagate_map_exceptions=False,
on_load_failure_callback=None):
super(NamedExtensionManager, self)._init_attributes(
namespace, propagate_map_exceptions=propagate_map_exceptions,
on_load_failure_callback=on_load_failure_callback)
self._names = names
self._name_order = name_order
def _init_plugins(self, extensions):
super(NamedExtensionManager, self)._init_plugins(extensions)
if self._name_order:
self.extensions = [self[n] for n in self._names]
def _load_one_plugin(self, ep, invoke_on_load, invoke_args, invoke_kwds,
verify_requirements):
# Check the name before going any further to prevent
# undesirable code from being loaded at all if we are not
# going to use it.
if ep.name not in self._names:
return None
return super(NamedExtensionManager, self)._load_one_plugin(
ep, invoke_on_load, invoke_args, invoke_kwds,
verify_requirements,
)
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