hooks/syncsources.py
author Sylvain Thénault <sylvain.thenault@logilab.fr>
Mon, 18 Jul 2011 15:48:09 +0200
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child 7735 71adfd6bab38
permissions -rw-r--r--
unsaved change...
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# copyright 2010-2011 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
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# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
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#
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# This file is part of CubicWeb.
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#
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# CubicWeb is free software: you can redistribute it and/or modify it under the
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# terms of the GNU Lesser General Public License as published by the Free
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# Software Foundation, either version 2.1 of the License, or (at your option)
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# any later version.
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#
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# CubicWeb is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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# FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
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# details.
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#
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# You should have received a copy of the GNU Lesser General Public License along
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# with CubicWeb.  If not, see <http://www.gnu.org/licenses/>.
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"""hooks for repository sources synchronization"""
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from socket import gethostname
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from yams.schema import role_name
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from cubicweb import ValidationError
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from cubicweb.selectors import is_instance
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from cubicweb.server import SOURCE_TYPES, hook
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class SourceHook(hook.Hook):
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    __abstract__ = True
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    category = 'cw.sources'
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# repo sources synchronization #################################################
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class SourceAddedOp(hook.Operation):
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    def postcommit_event(self):
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        self.session.repo.add_source(self.entity)
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class SourceAddedHook(SourceHook):
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    __regid__ = 'cw.sources.added'
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    __select__ = SourceHook.__select__ & is_instance('CWSource')
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    events = ('after_add_entity',)
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    def __call__(self):
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        try:
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            sourcecls = SOURCE_TYPES[self.entity.type]
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        except KeyError:
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            msg = self._cw._('unknown source type')
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            raise ValidationError(self.entity.eid,
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                                  {role_name('type', 'subject'): msg})
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        sourcecls.check_conf_dict(self.entity.eid, self.entity.host_config,
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                                  fail_if_unknown=not self._cw.vreg.config.repairing)
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        SourceAddedOp(self._cw, entity=self.entity)
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class SourceRemovedOp(hook.Operation):
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    def postcommit_event(self):
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        self.session.repo.remove_source(self.uri)
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class SourceRemovedHook(SourceHook):
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    __regid__ = 'cw.sources.removed'
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    __select__ = SourceHook.__select__ & is_instance('CWSource')
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    events = ('before_delete_entity',)
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    def __call__(self):
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        if self.entity.name == 'system':
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            raise ValidationError(self.entity.eid, {None: 'cant remove system source'})
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        SourceRemovedOp(self._cw, uri=self.entity.name)
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class SourceUpdatedOp(hook.DataOperationMixIn, hook.Operation):
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    def precommit_event(self):
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        self.__processed = []
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        for source in self.get_data():
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            if not self.session.deleted_in_transaction(source.eid):
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                conf = source.repo_source.check_config(source)
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                self.__processed.append( (source, conf) )
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    def postcommit_event(self):
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        for source, conf in self.__processed:
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            source.repo_source.update_config(source, conf)
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class SourceUpdatedHook(SourceHook):
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    __regid__ = 'cw.sources.configupdate'
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    __select__ = SourceHook.__select__ & is_instance('CWSource')
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    events = ('after_update_entity',)
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    def __call__(self):
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        if 'config' in self.entity.cw_edited:
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            SourceUpdatedOp.get_instance(self._cw).add_data(self.entity)
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class SourceHostConfigUpdatedHook(SourceHook):
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    __regid__ = 'cw.sources.hostconfigupdate'
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    __select__ = SourceHook.__select__ & is_instance('CWSourceHostConfig')
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    events = ('after_add_entity', 'after_update_entity', 'before_delete_entity',)
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    def __call__(self):
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        if self.entity.match(gethostname()):
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            if self.event == 'after_update_entity' and \
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                   not 'config' in self.entity.cw_edited:
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                return
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            try:
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                SourceUpdatedOp.get_instance(self._cw).add_data(self.entity.cwsource)
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            except IndexError:
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                # XXX no source linked to the host config yet
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                pass
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# source mapping synchronization ###############################################
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#
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# Expect cw_for_source/cw_schema are immutable relations (i.e. can't change from
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# a source or schema to another).
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class SourceMappingDeleteHook(SourceHook):
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    """check cw_for_source and cw_schema are immutable relations
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    XXX empty delete perms would be enough?
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    """
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    __regid__ = 'cw.sources.delschemaconfig'
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    __select__ = SourceHook.__select__ & hook.match_rtype('cw_for_source', 'cw_schema')
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    events = ('before_add_relation',)
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    def __call__(self):
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        if not self._cw.added_in_transaction(self.eidfrom):
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            msg = self._cw._("can't change this relation")
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            raise ValidationError(self.eidfrom, {self.rtype: msg})
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class SourceMappingChangedOp(hook.DataOperationMixIn, hook.Operation):
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    def check_or_update(self, checkonly):
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        session = self.session
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        # take care, can't call get_data() twice
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        try:
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            data = self.__data
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        except AttributeError:
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            data = self.__data = self.get_data()
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        for schemacfg, source in data:
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            if source is None:
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                source = schemacfg.cwsource.repo_source
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            if session.added_in_transaction(schemacfg.eid):
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                if not session.deleted_in_transaction(schemacfg.eid):
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                    source.add_schema_config(schemacfg, checkonly=checkonly)
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            elif session.deleted_in_transaction(schemacfg.eid):
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                source.del_schema_config(schemacfg, checkonly=checkonly)
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            else:
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                source.update_schema_config(schemacfg, checkonly=checkonly)
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    def precommit_event(self):
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        self.check_or_update(True)
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    def postcommit_event(self):
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        self.check_or_update(False)
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class SourceMappingChangedHook(SourceHook):
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    __regid__ = 'cw.sources.schemaconfig'
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    __select__ = SourceHook.__select__ & is_instance('CWSourceSchemaConfig')
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    events = ('after_add_entity', 'after_update_entity')
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    def __call__(self):
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        if self.event == 'after_add_entity' or (
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            self.event == 'after_update_entity' and 'options' in self.entity.cw_edited):
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            SourceMappingChangedOp.get_instance(self._cw).add_data(
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                (self.entity, None) )
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class SourceMappingDeleteHook(SourceHook):
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    __regid__ = 'cw.sources.delschemaconfig'
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    __select__ = SourceHook.__select__ & hook.match_rtype('cw_for_source')
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    events = ('before_delete_relation',)
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    def __call__(self):
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        SourceMappingChangedOp.get_instance(self._cw).add_data(
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            (self._cw.entity_from_eid(self.eidfrom),
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             self._cw.entity_from_eid(self.eidto).repo_source) )