server/hooksmanager.py
author Sylvain Thénault <sylvain.thenault@logilab.fr>
Tue, 22 Dec 2009 18:25:53 +0100
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"""Hooks management
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Hooks are called before / after any individual update of entities / relations
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in the repository.
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Here is the prototype of the different hooks:
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* filtered on the entity's type:
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  before_add_entity    (session, entity)
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  after_add_entity     (session, entity)
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  before_update_entity (session, entity)
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  after_update_entity  (session, entity)
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  before_delete_entity (session, eid)
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  after_delete_entity  (session, eid)
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* filtered on the relation's type:
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  before_add_relation    (session, fromeid, rtype, toeid)
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  after_add_relation     (session, fromeid, rtype, toeid)
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  before_delete_relation (session, fromeid, rtype, toeid)
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  after_delete_relation  (session, fromeid, rtype, toeid)
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:organization: Logilab
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:copyright: 2001-2009 LOGILAB S.A. (Paris, FRANCE), license is LGPL v2.
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:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr
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:license: GNU Lesser General Public License, v2.1 - http://www.gnu.org/licenses
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"""
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__docformat__ = "restructuredtext en"
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ENTITIES_HOOKS = ('before_add_entity',    'after_add_entity',
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                  'before_update_entity', 'after_update_entity',
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                  'before_delete_entity', 'after_delete_entity')
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RELATIONS_HOOKS = ('before_add_relation',   'after_add_relation' ,
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                   'before_delete_relation','after_delete_relation')
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SYSTEM_HOOKS = ('server_backup', 'server_restore',
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                'server_startup', 'server_shutdown',
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                'session_open', 'session_close')
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ALL_HOOKS = frozenset(ENTITIES_HOOKS + RELATIONS_HOOKS + SYSTEM_HOOKS)
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class HooksManager(object):
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    """handle hooks registration and calls
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    """
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    verification_hooks_activated = True
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    def __init__(self, schema):
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        self.set_schema(schema)
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    def set_schema(self, schema):
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        self._hooks = {}
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        self.schema = schema
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        self._init_hooks(schema)
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    def register_hooks(self, hooks):
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        """register a dictionary of hooks :
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             {'event': {'entity or relation type': [callbacks list]}}
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        """
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        for event, subevents in hooks.items():
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            for subevent, callbacks in subevents.items():
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                for callback in callbacks:
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                    self.register_hook(callback, event, subevent)
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    def register_hook(self, function, event, etype=''):
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        """register a function to call when <event> occurs
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        <etype> is an entity/relation type or an empty string.
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        If etype is the empty string, the function will be called at each event,
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        else the function will be called only when event occurs on an entity or
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        relation of the given type.
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        """
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        assert event in ALL_HOOKS, '%r NOT IN %r' % (event, ALL_HOOKS)
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        assert (not event in SYSTEM_HOOKS or not etype), (event, etype)
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        etype = etype or ''
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        try:
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            self._hooks[event][etype].append(function)
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            self.debug('registered hook %s on %s (%s)', event, etype or 'any',
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                       function.func_name)
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        except KeyError:
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            self.error('can\'t register hook %s on %s (%s)',
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                       event, etype or 'any', function.func_name)
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    def unregister_hook(self, function_or_cls, event=None, etype=''):
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        """unregister a function to call when <event> occurs, or a Hook subclass.
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        In the later case, event/type information are extracted from the given
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        class.
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        """
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        if isinstance(function_or_cls, type) and issubclass(function_or_cls, Hook):
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            for event, ertype in function_or_cls.register_to():
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                for hook in self._hooks[event][ertype]:
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                    if getattr(hook, 'im_self', None).__class__ is function_or_cls:
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                        self._hooks[event][ertype].remove(hook)
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                        self.info('unregister hook %s on %s (%s)', event, etype,
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                                  function_or_cls.__name__)
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                        break
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                else:
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                    self.warning("can't unregister hook %s on %s (%s), not found",
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                                 event, etype, function_or_cls.__name__)
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        else:
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            assert event in ALL_HOOKS, event
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            etype = etype or ''
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            self.info('unregister hook %s on %s (%s)', event, etype,
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                      function_or_cls.func_name)
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            self._hooks[event][etype].remove(function_or_cls)
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    def call_hooks(self, __event, __type='', *args, **kwargs):
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        """call hook matching event and optional type"""
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        if __type:
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            self.info('calling hooks for event %s (%s)', __event, __type)
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        else:
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            self.info('calling hooks for event %s', __event)
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        # call generic hooks first
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        for hook in self._hooks[__event]['']:
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            #print '[generic]', hook.__name__
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            hook(*args, **kwargs)
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        if __type:
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            for hook in self._hooks[__event][__type]:
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                #print '[%s]'%__type, hook.__name__
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                hook(*args, **kwargs)
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0
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    def _init_hooks(self, schema):
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        """initialize the hooks map"""
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        for hook_event in ENTITIES_HOOKS:
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            self._hooks[hook_event] = {'': []}
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            for etype in schema.entities():
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                self._hooks[hook_event][etype] = []
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        for hook_event in RELATIONS_HOOKS:
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            self._hooks[hook_event] = {'': []}
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            for r_type in schema.relations():
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                self._hooks[hook_event][r_type] = []
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        for hook_event in SYSTEM_HOOKS:
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            self._hooks[hook_event] = {'': []}
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    def register_system_hooks(self, config):
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        """register system hooks according to the configuration"""
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        self.info('register core hooks')
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        from cubicweb.server.hooks import _register_metadata_hooks, _register_wf_hooks
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        _register_metadata_hooks(self)
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        self.info('register workflow hooks')
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        _register_wf_hooks(self)
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        if config.core_hooks:
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            from cubicweb.server.hooks import _register_core_hooks
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            _register_core_hooks(self)
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        if config.schema_hooks:
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            from cubicweb.server.schemahooks import _register_schema_hooks
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            self.info('register schema hooks')
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            _register_schema_hooks(self)
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        if config.usergroup_hooks:
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            from cubicweb.server.hooks import _register_usergroup_hooks
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            from cubicweb.server.hooks import _register_eproperty_hooks
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            self.info('register user/group hooks')
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            _register_usergroup_hooks(self)
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            _register_eproperty_hooks(self)
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        if config.security_hooks:
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            from cubicweb.server.securityhooks import register_security_hooks
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            self.info('register security hooks')
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            register_security_hooks(self)
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        if not self.verification_hooks_activated:
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            self.deactivate_verification_hooks()
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    def deactivate_verification_hooks(self):
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        from cubicweb.server.hooks import (cardinalitycheck_after_add_entity,
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                                        cardinalitycheck_before_del_relation,
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                                        cstrcheck_after_add_relation,
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                                        uniquecstrcheck_before_modification)
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        self.warning('deactivating verification hooks')
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        self.verification_hooks_activated = False
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        self.unregister_hook(cardinalitycheck_after_add_entity, 'after_add_entity', '')
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        self.unregister_hook(cardinalitycheck_before_del_relation, 'before_delete_relation', '')
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        self.unregister_hook(cstrcheck_after_add_relation, 'after_add_relation', '')
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        self.unregister_hook(uniquecstrcheck_before_modification, 'before_add_entity', '')
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        self.unregister_hook(uniquecstrcheck_before_modification, 'before_update_entity', '')
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#         self.unregister_hook(tidy_html_fields('before_add_entity'), 'before_add_entity', '')
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#         self.unregister_hook(tidy_html_fields('before_update_entity'), 'before_update_entity', '')
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0
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    def reactivate_verification_hooks(self):
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        from cubicweb.server.hooks import (cardinalitycheck_after_add_entity,
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                                        cardinalitycheck_before_del_relation,
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                                        cstrcheck_after_add_relation,
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                                        uniquecstrcheck_before_modification)
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        self.warning('reactivating verification hooks')
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        self.verification_hooks_activated = True
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        self.register_hook(cardinalitycheck_after_add_entity, 'after_add_entity', '')
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        self.register_hook(cardinalitycheck_before_del_relation, 'before_delete_relation', '')
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        self.register_hook(cstrcheck_after_add_relation, 'after_add_relation', '')
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        self.register_hook(uniquecstrcheck_before_modification, 'before_add_entity', '')
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        self.register_hook(uniquecstrcheck_before_modification, 'before_update_entity', '')
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#         self.register_hook(tidy_html_fields('before_add_entity'), 'before_add_entity', '')
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#         self.register_hook(tidy_html_fields('before_update_entity'), 'before_update_entity', '')
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from cubicweb.selectors import yes
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from cubicweb.appobject import AppObject
0
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class autoid(type):
0
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    """metaclass to create an unique 'id' attribute on the class using it"""
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    # XXX is this metaclass really necessary ?
0
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    def __new__(mcs, name, bases, classdict):
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        cls = super(autoid, mcs).__new__(mcs, name, bases, classdict)
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        cls.id = str(id(cls))
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        return cls
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class Hook(AppObject):
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    __metaclass__ = autoid
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    __registry__ = 'hooks'
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    __select__ = yes()
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    # set this in derivated classes
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    events = None
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    accepts = None
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    enabled = True
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0
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    def __init__(self, event=None):
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        super(Hook, self).__init__()
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        self.event = event
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0
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    @classmethod
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    def registered(cls, vreg):
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        super(Hook, cls).registered(vreg)
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        return cls()
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0
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    @classmethod
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    def register_to(cls):
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        if not cls.enabled:
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            cls.warning('%s hook has been disabled', cls)
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            return
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        done = set()
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        assert isinstance(cls.events, (tuple, list)), \
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               '%s: events is expected to be a tuple, not %s' % (
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            cls, type(cls.events))
0
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        for event in cls.events:
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            if event in SYSTEM_HOOKS:
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                assert not cls.accepts or cls.accepts == ('Any',), \
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                       '%s doesnt make sense on %s' % (cls.accepts, event)
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                cls.accepts = ('Any',)
0
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            for ertype in cls.accepts:
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                if (event, ertype) in done:
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                    continue
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                yield event, ertype
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                done.add((event, ertype))
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                try:
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                    eschema = cls.schema.eschema(ertype)
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                except KeyError:
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                    # relation schema
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                    pass
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                else:
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                    for eetype in eschema.specialized_by():
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                        if (event, eetype) in done:
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                            continue
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                        yield event, str(eetype)
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                        done.add((event, eetype))
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0
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    def make_callback(self, event):
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        if len(self.events) == 1:
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            return self.call
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        return self.__class__(event=event).call
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    def call(self):
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        raise NotImplementedError
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0
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class SystemHook(Hook):
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    accepts = ()
0
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from logging import getLogger
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from cubicweb import set_log_methods
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set_log_methods(HooksManager, getLogger('cubicweb.hooksmanager'))
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set_log_methods(Hook, getLogger('cubicweb.hooks'))
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# base classes for relation propagation ########################################
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from cubicweb.server.pool import PreCommitOperation
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class PropagateSubjectRelationHook(Hook):
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    """propagate permissions and nosy list when new entity are added"""
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    events = ('after_add_relation',)
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    # to set in concrete class
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    rtype = None
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    subject_relations = None
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    object_relations = None
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    accepts = None # subject_relations + object_relations
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    def call(self, session, fromeid, rtype, toeid):
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        for eid in (fromeid, toeid):
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            etype = session.describe(eid)[0]
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            if self.rtype not in self.schema.eschema(etype).subjrels:
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                return
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        if rtype in self.subject_relations:
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            meid, seid = fromeid, toeid
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        else:
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            assert rtype in self.object_relations
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            meid, seid = toeid, fromeid
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        session.unsafe_execute(
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            'SET E %s P WHERE X %s P, X eid %%(x)s, E eid %%(e)s, NOT E %s P'\
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            % (self.rtype, self.rtype, self.rtype),
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            {'x': meid, 'e': seid}, ('x', 'e'))
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class PropagateSubjectRelationAddHook(Hook):
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    """propagate on existing entities when a permission or nosy list is added"""
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    events = ('after_add_relation',)
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    # to set in concrete class
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    rtype = None
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    subject_relations = None
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    object_relations = None
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    accepts = None # (self.rtype,)
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    def call(self, session, fromeid, rtype, toeid):
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        eschema = self.schema.eschema(session.describe(fromeid)[0])
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        execute = session.unsafe_execute
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        for rel in self.subject_relations:
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            if rel in eschema.subjrels:
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                execute('SET R %s P WHERE X eid %%(x)s, P eid %%(p)s, '
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                        'X %s R, NOT R %s P' % (rtype, rel, rtype),
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                        {'x': fromeid, 'p': toeid}, 'x')
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        for rel in self.object_relations:
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            if rel in eschema.objrels:
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                execute('SET R %s P WHERE X eid %%(x)s, P eid %%(p)s, '
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                        'R %s X, NOT R %s P' % (rtype, rel, rtype),
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                        {'x': fromeid, 'p': toeid}, 'x')
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class PropagateSubjectRelationDelHook(Hook):
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    """propagate on existing entities when a permission is deleted"""
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    events = ('after_delete_relation',)
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    # to set in concrete class
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    rtype = None
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    subject_relations = None
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    object_relations = None
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    accepts = None # (self.rtype,)
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    def call(self, session, fromeid, rtype, toeid):
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        eschema = self.schema.eschema(session.describe(fromeid)[0])
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        execute = session.unsafe_execute
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        for rel in self.subject_relations:
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            if rel in eschema.subjrels:
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                execute('DELETE R %s P WHERE X eid %%(x)s, P eid %%(p)s, '
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                        'X %s R' % (rtype, rel),
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                        {'x': fromeid, 'p': toeid}, 'x')
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        for rel in self.object_relations:
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            if rel in eschema.objrels:
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                execute('DELETE R %s P WHERE X eid %%(x)s, P eid %%(p)s, '
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                        'R %s X' % (rtype, rel),
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                        {'x': fromeid, 'p': toeid}, 'x')