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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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"""Support for plugin hooking logic."""
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from bzrlib import registry
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from __future__ import absolute_import
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from bzrlib.lazy_import import lazy_import
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lazy_import(globals(), """
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from bzrlib import (
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_format_version_tuple,
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from bzrlib.help_topics import help_as_plain_text
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_format_version_tuple,
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from bzrlib.i18n import gettext
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known_hooks = registry.Registry()
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# known_hooks registry contains
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# tuple of (module, member name) which is the hook point
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# module where the specific hooks are defined
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# callable to get the empty specific Hooks for that attribute
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known_hooks.register_lazy(('bzrlib.branch', 'Branch.hooks'), 'bzrlib.branch',
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known_hooks.register_lazy(('bzrlib.bzrdir', 'BzrDir.hooks'), 'bzrlib.bzrdir',
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known_hooks.register_lazy(('bzrlib.commands', 'Command.hooks'),
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'bzrlib.commands', 'CommandHooks')
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known_hooks.register_lazy(('bzrlib.info', 'hooks'),
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'bzrlib.info', 'InfoHooks')
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known_hooks.register_lazy(('bzrlib.lock', 'Lock.hooks'), 'bzrlib.lock',
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known_hooks.register_lazy(('bzrlib.merge', 'Merger.hooks'), 'bzrlib.merge',
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known_hooks.register_lazy(('bzrlib.msgeditor', 'hooks'), 'bzrlib.msgeditor',
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known_hooks.register_lazy(('bzrlib.mutabletree', 'MutableTree.hooks'),
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'bzrlib.mutabletree', 'MutableTreeHooks')
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known_hooks.register_lazy(('bzrlib.smart.client', '_SmartClient.hooks'),
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'bzrlib.smart.client', 'SmartClientHooks')
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known_hooks.register_lazy(('bzrlib.smart.server', 'SmartTCPServer.hooks'),
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'bzrlib.smart.server', 'SmartServerHooks')
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known_hooks.register_lazy(
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('bzrlib.version_info_formats.format_rio', 'RioVersionInfoBuilder.hooks'),
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'bzrlib.version_info_formats.format_rio', 'RioVersionInfoBuilderHooks')
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known_hooks.register_lazy(
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('bzrlib.merge_directive', 'BaseMergeDirective.hooks'),
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'bzrlib.merge_directive', 'MergeDirectiveHooks')
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class KnownHooksRegistry(registry.Registry):
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# known_hooks registry contains
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# tuple of (module, member name) which is the hook point
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# module where the specific hooks are defined
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# callable to get the empty specific Hooks for that attribute
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def register_lazy_hook(self, hook_module_name, hook_member_name,
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hook_factory_member_name):
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self.register_lazy((hook_module_name, hook_member_name),
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hook_module_name, hook_factory_member_name)
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def iter_parent_objects(self):
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"""Yield (hook_key, (parent_object, attr)) tuples for every registered
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hook, where 'parent_object' is the object that holds the hook
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This is useful for resetting/restoring all the hooks to a known state,
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as is done in bzrlib.tests.TestCase._clear_hooks.
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for key in self.keys():
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yield key, self.key_to_parent_and_attribute(key)
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def key_to_parent_and_attribute(self, (module_name, member_name)):
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"""Convert a known_hooks key to a (parent_obj, attr) pair.
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:param key: A tuple (module_name, member_name) as found in the keys of
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the known_hooks registry.
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:return: The parent_object of the hook and the name of the attribute on
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that parent object where the hook is kept.
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parent_mod, parent_member, attr = pyutils.calc_parent_name(module_name,
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return pyutils.get_named_object(parent_mod, parent_member), attr
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_builtin_known_hooks = (
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('bzrlib.branch', 'Branch.hooks', 'BranchHooks'),
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('bzrlib.controldir', 'ControlDir.hooks', 'ControlDirHooks'),
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('bzrlib.commands', 'Command.hooks', 'CommandHooks'),
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('bzrlib.config', 'ConfigHooks', '_ConfigHooks'),
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('bzrlib.info', 'hooks', 'InfoHooks'),
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('bzrlib.lock', 'Lock.hooks', 'LockHooks'),
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('bzrlib.merge', 'Merger.hooks', 'MergeHooks'),
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('bzrlib.msgeditor', 'hooks', 'MessageEditorHooks'),
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('bzrlib.mutabletree', 'MutableTree.hooks', 'MutableTreeHooks'),
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('bzrlib.smart.client', '_SmartClient.hooks', 'SmartClientHooks'),
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('bzrlib.smart.server', 'SmartTCPServer.hooks', 'SmartServerHooks'),
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('bzrlib.status', 'hooks', 'StatusHooks'),
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('bzrlib.transport', 'Transport.hooks', 'TransportHooks'),
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('bzrlib.version_info_formats.format_rio', 'RioVersionInfoBuilder.hooks',
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'RioVersionInfoBuilderHooks'),
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('bzrlib.merge_directive', 'BaseMergeDirective.hooks',
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'MergeDirectiveHooks'),
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known_hooks = KnownHooksRegistry()
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for (_hook_module, _hook_attribute, _hook_class) in _builtin_known_hooks:
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known_hooks.register_lazy_hook(_hook_module, _hook_attribute, _hook_class)
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del _builtin_known_hooks, _hook_module, _hook_attribute, _hook_class
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def known_hooks_key_to_object((module_name, member_name)):
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FOO hook is triggered.
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def __init__(self, module=None, member_name=None):
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"""Create a new hooks dictionary.
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:param module: The module from which this hooks dictionary should be loaded
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(used for lazy hooks)
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:param member_name: Name under which this hooks dictionary should be loaded.
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(used for lazy hooks)
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dict.__init__(self)
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self._callable_names = {}
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def create_hook(self, hook):
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"""Create a hook which can have callbacks registered for it.
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:param hook: The hook to create. An object meeting the protocol of
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bzrlib.hooks.HookPoint. It's name is used as the key for future
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self._lazy_callable_names = {}
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self._module = module
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self._member_name = member_name
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def add_hook(self, name, doc, introduced, deprecated=None):
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"""Add a hook point to this dictionary.
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:param name: The name of the hook, for clients to use when registering.
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:param doc: The docs for the hook.
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:param introduced: When the hook was introduced (e.g. (0, 15)).
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:param deprecated: When the hook was deprecated, None for
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if hook.name in self:
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raise errors.DuplicateKey(hook.name)
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self[hook.name] = hook
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raise errors.DuplicateKey(name)
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callbacks = _lazy_hooks.setdefault(
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(self._module, self._member_name, name), [])
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hookpoint = HookPoint(name=name, doc=doc, introduced=introduced,
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deprecated=deprecated, callbacks=callbacks)
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self[name] = hookpoint
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"""Generate the documentation for this Hooks instance.
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the code names are rarely meaningful for end users and this is not
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intended for debugging.
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return self._callable_names.get(a_callable, "No hook name")
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name = self._callable_names.get(a_callable, None)
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if name is None and a_callable is not None:
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name = self._lazy_callable_names.get((a_callable.__module__,
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a_callable.__name__),
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return 'No hook name'
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def install_named_hook_lazy(self, hook_name, callable_module,
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callable_member, name):
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"""Install a_callable in to the hook hook_name lazily, and label it.
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:param hook_name: A hook name. See the __init__ method for the complete
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:param callable_module: Name of the module in which the callable is
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:param callable_member: Member name of the callable.
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:param name: A name to associate the callable with, to show users what
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hook = self[hook_name]
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raise errors.UnknownHook(self.__class__.__name__, hook_name)
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hook_lazy = getattr(hook, "hook_lazy")
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except AttributeError:
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raise errors.UnsupportedOperation(self.install_named_hook_lazy,
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hook_lazy(callable_module, callable_member, name)
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self.name_hook_lazy(callable_module, callable_member, name)
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def install_named_hook(self, hook_name, a_callable, name):
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"""Install a_callable in to the hook hook_name, and label it name.
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:param hook_name: A hook name. See the __init__ method of BranchHooks
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for the complete list of hooks.
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:param hook_name: A hook name. See the __init__ method for the complete
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:param a_callable: The callable to be invoked when the hook triggers.
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The exact signature will depend on the hook - see the __init__
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method of BranchHooks for details on each hook.
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method for details on each hook.
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:param name: A name to associate a_callable with, to show users what is
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if name is not None:
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self.name_hook(a_callable, name)
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def uninstall_named_hook(self, hook_name, label):
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"""Uninstall named hooks.
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:param hook_name: Hook point name
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:param label: Label of the callable to uninstall
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hook = self[hook_name]
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raise errors.UnknownHook(self.__class__.__name__, hook_name)
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uninstall = getattr(hook, "uninstall")
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except AttributeError:
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raise errors.UnsupportedOperation(self.uninstall_named_hook, self)
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def name_hook(self, a_callable, name):
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"""Associate name with a_callable to show users what is running."""
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self._callable_names[a_callable] = name
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def name_hook_lazy(self, callable_module, callable_member, callable_name):
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self._lazy_callable_names[(callable_module, callable_member)]= \
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class HookPoint(object):
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"""A single hook that clients can register to be called back when it fires.
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:ivar name: The name of the hook.
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:ivar doc: The docs for using the hook.
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:ivar introduced: A version tuple specifying what version the hook was
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introduced in. None indicates an unknown version.
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:ivar deprecated: A version tuple specifying what version the hook was
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deprecated or superseded in. None indicates that the hook is not
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superseded or deprecated. If the hook is superseded then the doc
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should describe the recommended replacement hook to register for.
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:ivar doc: The docs for using the hook.
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def __init__(self, name, doc, introduced, deprecated):
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def __init__(self, name, doc, introduced, deprecated=None, callbacks=None):
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"""Create a HookPoint.
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:param name: The name of the hook, for clients to use when registering.
added
removed
bzrlib/hooks.py
