hooks/syncsources.py
author Sylvain Thénault <sylvain.thenault@logilab.fr>
Mon, 23 Jan 2012 13:25:02 +0100
changeset 8190 2a3c1b787688
parent 7879 9aae456abab5
child 8556 bbe0d6985e59
permissions -rw-r--r--
[vreg] move base registry implementation to logilab.common. Closes #1916014 A new logilab.common.registry module has been created with content from * cw.vreg (the whole things that was in there) * cw.appobject (base selectors and all). In the process, we've done some renaming: * former selector functions are now known as "predicate", though you still use predicates to build an object'selector * hence `objectify_selector` decorator is now `objectify_predicate` * the top level registry is now `RegistryStore` (was `VRegistry`) Also there is no more need for the @lltrace decorator. On the CubicWeb side, the `selectors` module has been renamed to `predicates`. There should be full backward compat with proper deprecation warnings.
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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.predicates 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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    entity = None # make pylint happy
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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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    uri = None # make pylint happy
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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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    oldname = newname = None # make pylint happy
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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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   104
        repo.sources_by_uri[self.newname] = source
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   105
        repo._type_source_cache.clear()
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   106
        clear_cache(repo, 'source_defs')
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   107
        if not source.copy_based_source:
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diff changeset
   108
            repo._extid_cache.clear()
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diff changeset
   109
            repo._clear_planning_caches()
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   110
            for cnxset in repo.cnxsets:
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   111
                cnxset.source_cnxs[self.oldname] = cnxset.source_cnxs.pop(self.oldname)
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diff changeset
   112
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diff changeset
   113
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   114
class SourceUpdatedHook(SourceHook):
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   115
    __regid__ = 'cw.sources.configupdate'
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   116
    __select__ = SourceHook.__select__ & is_instance('CWSource')
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   117
    events = ('before_update_entity',)
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   118
    def __call__(self):
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   119
        if 'config' in self.entity.cw_edited:
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   120
            SourceConfigUpdatedOp.get_instance(self._cw).add_data(self.entity)
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   121
        if 'name' in self.entity.cw_edited:
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   122
            oldname, newname = self.entity.cw_edited.oldnewvalue('name')
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   123
            SourceRenamedOp(self._cw, oldname=oldname, newname=newname)
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   124
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   125
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   126
class SourceHostConfigUpdatedHook(SourceHook):
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   127
    __regid__ = 'cw.sources.hostconfigupdate'
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   128
    __select__ = SourceHook.__select__ & is_instance('CWSourceHostConfig')
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   129
    events = ('after_add_entity', 'after_update_entity', 'before_delete_entity',)
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   130
    def __call__(self):
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   131
        if self.entity.match(gethostname()):
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   132
            if self.event == 'after_update_entity' and \
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   133
                   not 'config' in self.entity.cw_edited:
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   134
                return
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   135
            try:
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   136
                SourceConfigUpdatedOp.get_instance(self._cw).add_data(self.entity.cwsource)
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   137
            except IndexError:
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   138
                # XXX no source linked to the host config yet
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   139
                pass
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   140
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   141
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   142
# source mapping synchronization ###############################################
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   143
#
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   144
# Expect cw_for_source/cw_schema are immutable relations (i.e. can't change from
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   145
# a source or schema to another).
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   146
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   147
class SourceMappingImmutableHook(SourceHook):
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   148
    """check cw_for_source and cw_schema are immutable relations
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   149
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   150
    XXX empty delete perms would be enough?
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   151
    """
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   152
    __regid__ = 'cw.sources.mapping.immutable'
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   153
    __select__ = SourceHook.__select__ & hook.match_rtype('cw_for_source', 'cw_schema')
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   154
    events = ('before_add_relation',)
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   155
    def __call__(self):
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   156
        if not self._cw.added_in_transaction(self.eidfrom):
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   157
            msg = self._cw._("can't change this relation")
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   158
            raise ValidationError(self.eidfrom, {self.rtype: msg})
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   159
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   160
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   161
class SourceMappingChangedOp(hook.DataOperationMixIn, hook.Operation):
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   162
    def check_or_update(self, checkonly):
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   163
        session = self.session
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   164
        # take care, can't call get_data() twice
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   165
        try:
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   166
            data = self.__data
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   167
        except AttributeError:
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   168
            data = self.__data = self.get_data()
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diff changeset
   169
        for schemacfg, source in data:
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   170
            if source is None:
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   171
                source = schemacfg.cwsource.repo_source
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   172
            if session.added_in_transaction(schemacfg.eid):
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   173
                if not session.deleted_in_transaction(schemacfg.eid):
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   174
                    source.add_schema_config(schemacfg, checkonly=checkonly)
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   175
            elif session.deleted_in_transaction(schemacfg.eid):
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   176
                source.del_schema_config(schemacfg, checkonly=checkonly)
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   177
            else:
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   178
                source.update_schema_config(schemacfg, checkonly=checkonly)
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   179
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   180
    def precommit_event(self):
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   181
        self.check_or_update(True)
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   182
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   183
    def postcommit_event(self):
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   184
        self.check_or_update(False)
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   185
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   186
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   187
class SourceMappingChangedHook(SourceHook):
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   188
    __regid__ = 'cw.sources.schemaconfig'
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   189
    __select__ = SourceHook.__select__ & is_instance('CWSourceSchemaConfig')
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   190
    events = ('after_add_entity', 'after_update_entity')
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   191
    def __call__(self):
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   192
        if self.event == 'after_add_entity' or (
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   193
            self.event == 'after_update_entity' and 'options' in self.entity.cw_edited):
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   194
            SourceMappingChangedOp.get_instance(self._cw).add_data(
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   195
                (self.entity, None) )
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   196
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   197
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) )