hooks/syncsources.py
author Sylvain Thénault <sylvain.thenault@logilab.fr>
Thu, 04 Aug 2011 12:50:49 +0200
branchstable
changeset 7735 71adfd6bab38
parent 7650 278fe9c1f3ad
child 7879 9aae456abab5
permissions -rw-r--r--
[source] update system table and internal structures on source renaming. Closes #1896721
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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 logilab.common.decorators import clear_cache
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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 SourceConfigUpdatedOp(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 SourceRenamedOp(hook.LateOperation):
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    def precommit_event(self):
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        source = self.session.repo.sources_by_uri[self.oldname]
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        if source.copy_based_source:
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            sql = 'UPDATE entities SET asource=%(newname)s WHERE asource=%(oldname)s'
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        else:
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            sql = 'UPDATE entities SET source=%(newname)s, asource=%(newname)s WHERE source=%(oldname)s'
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        self.session.system_sql(sql, {'oldname': self.oldname,
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                                      'newname': self.newname})
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    def postcommit_event(self):
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        repo = self.session.repo
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        # XXX race condition
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        source = repo.sources_by_uri.pop(self.oldname)
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        source.uri = self.newname
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        source.public_config['uri'] = self.newname
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        repo.sources_by_uri[self.newname] = source
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        repo._type_source_cache.clear()
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        clear_cache(repo, 'source_defs')
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        if not source.copy_based_source:
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            repo._extid_cache.clear()
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            repo._clear_planning_caches()
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   107
            for cnxset in repo.cnxsets:
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   108
                cnxset.source_cnxs[self.oldname] = cnxset.source_cnxs.pop(self.oldname)
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   109
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   110
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   111
class SourceUpdatedHook(SourceHook):
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   112
    __regid__ = 'cw.sources.configupdate'
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   113
    __select__ = SourceHook.__select__ & is_instance('CWSource')
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   114
    events = ('before_update_entity',)
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   115
    def __call__(self):
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   116
        if 'config' in self.entity.cw_edited:
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   117
            SourceConfigUpdatedOp.get_instance(self._cw).add_data(self.entity)
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   118
        if 'name' in self.entity.cw_edited:
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   119
            oldname, newname = self.entity.cw_edited.oldnewvalue('name')
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   120
            SourceRenamedOp(self._cw, oldname=oldname, newname=newname)
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   121
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   122
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   123
class SourceHostConfigUpdatedHook(SourceHook):
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   124
    __regid__ = 'cw.sources.hostconfigupdate'
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   125
    __select__ = SourceHook.__select__ & is_instance('CWSourceHostConfig')
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   126
    events = ('after_add_entity', 'after_update_entity', 'before_delete_entity',)
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   127
    def __call__(self):
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   128
        if self.entity.match(gethostname()):
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   129
            if self.event == 'after_update_entity' and \
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   130
                   not 'config' in self.entity.cw_edited:
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   131
                return
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            try:
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   133
                SourceConfigUpdatedOp.get_instance(self._cw).add_data(self.entity.cwsource)
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   134
            except IndexError:
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   135
                # XXX no source linked to the host config yet
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   136
                pass
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   137
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   138
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   139
# source mapping synchronization ###############################################
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   140
#
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   141
# Expect cw_for_source/cw_schema are immutable relations (i.e. can't change from
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   142
# a source or schema to another).
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   143
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   144
class SourceMappingDeleteHook(SourceHook):
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    """check cw_for_source and cw_schema are immutable relations
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   146
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   147
    XXX empty delete perms would be enough?
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   148
    """
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   149
    __regid__ = 'cw.sources.delschemaconfig'
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   150
    __select__ = SourceHook.__select__ & hook.match_rtype('cw_for_source', 'cw_schema')
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   151
    events = ('before_add_relation',)
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   152
    def __call__(self):
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   153
        if not self._cw.added_in_transaction(self.eidfrom):
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   154
            msg = self._cw._("can't change this relation")
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   155
            raise ValidationError(self.eidfrom, {self.rtype: msg})
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   156
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   157
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   158
class SourceMappingChangedOp(hook.DataOperationMixIn, hook.Operation):
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   159
    def check_or_update(self, checkonly):
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   160
        session = self.session
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   161
        # take care, can't call get_data() twice
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   162
        try:
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   163
            data = self.__data
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   164
        except AttributeError:
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   165
            data = self.__data = self.get_data()
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   166
        for schemacfg, source in data:
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   167
            if source is None:
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   168
                source = schemacfg.cwsource.repo_source
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   169
            if session.added_in_transaction(schemacfg.eid):
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   170
                if not session.deleted_in_transaction(schemacfg.eid):
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   171
                    source.add_schema_config(schemacfg, checkonly=checkonly)
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   172
            elif session.deleted_in_transaction(schemacfg.eid):
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   173
                source.del_schema_config(schemacfg, checkonly=checkonly)
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   174
            else:
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   175
                source.update_schema_config(schemacfg, checkonly=checkonly)
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   176
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   177
    def precommit_event(self):
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   178
        self.check_or_update(True)
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   179
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   180
    def postcommit_event(self):
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   181
        self.check_or_update(False)
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   182
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   183
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   184
class SourceMappingChangedHook(SourceHook):
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   185
    __regid__ = 'cw.sources.schemaconfig'
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   186
    __select__ = SourceHook.__select__ & is_instance('CWSourceSchemaConfig')
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   187
    events = ('after_add_entity', 'after_update_entity')
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   188
    def __call__(self):
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   189
        if self.event == 'after_add_entity' or (
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   190
            self.event == 'after_update_entity' and 'options' in self.entity.cw_edited):
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   191
            SourceMappingChangedOp.get_instance(self._cw).add_data(
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   192
                (self.entity, None) )
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   193
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   194
class SourceMappingDeleteHook(SourceHook):
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   195
    __regid__ = 'cw.sources.delschemaconfig'
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   196
    __select__ = SourceHook.__select__ & hook.match_rtype('cw_for_source')
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   197
    events = ('before_delete_relation',)
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   198
    def __call__(self):
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   199
        SourceMappingChangedOp.get_instance(self._cw).add_data(
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            (self._cw.entity_from_eid(self.eidfrom),
7525
1f6839019e6a [source config] fix synchronization on configuration entity changes
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 7049
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   201
             self._cw.entity_from_eid(self.eidto).repo_source) )