add a new method iter_process_result which does the same as proces_result but is a generator (closes #1625374)
process_result is reimplemented using the new method, and the two helper
methods are turned into generators.
These generators use cursor.fetchmany instead of cursor.fetchall after setting
cursor.arraysize to 100. This means that the whole result set should never
loaded in memory when using the iter_process_result method. This is used in the
"portable" database dump implementation when we typically to 'SELECT * FROM
table', but could probably be used too in other parts of cubicweb.
# copyright 2010-2011 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
#
# This file is part of CubicWeb.
#
# CubicWeb is free software: you can redistribute it and/or modify it under the
# terms of the GNU Lesser General Public License as published by the Free
# Software Foundation, either version 2.1 of the License, or (at your option)
# any later version.
#
# CubicWeb is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
# details.
#
# You should have received a copy of the GNU Lesser General Public License along
# with CubicWeb. If not, see <http://www.gnu.org/licenses/>.
"""hooks for repository sources synchronization"""
from socket import gethostname
from yams.schema import role_name
from cubicweb import ValidationError
from cubicweb.selectors import is_instance
from cubicweb.server import SOURCE_TYPES, hook
class SourceHook(hook.Hook):
__abstract__ = True
category = 'cw.sources'
class SourceAddedOp(hook.Operation):
def postcommit_event(self):
self.session.repo.add_source(self.entity)
class SourceAddedHook(SourceHook):
__regid__ = 'cw.sources.added'
__select__ = SourceHook.__select__ & is_instance('CWSource')
events = ('after_add_entity',)
def __call__(self):
try:
sourcecls = SOURCE_TYPES[self.entity.type]
except KeyError:
msg = self._cw._('unknown source type')
raise ValidationError(self.entity.eid,
{role_name('type', 'subject'): msg})
sourcecls.check_conf_dict(self.entity.eid, self.entity.host_config,
fail_if_unknown=not self._cw.vreg.config.repairing)
SourceAddedOp(self._cw, entity=self.entity)
class SourceRemovedOp(hook.Operation):
def precommit_event(self):
self.session.repo.remove_source(self.uri)
class SourceRemovedHook(SourceHook):
__regid__ = 'cw.sources.removed'
__select__ = SourceHook.__select__ & is_instance('CWSource')
events = ('before_delete_entity',)
def __call__(self):
if self.entity.name == 'system':
raise ValidationError(self.entity.eid, {None: 'cant remove system source'})
SourceRemovedOp(self._cw, uri=self.entity.name)
class SourceUpdatedOp(hook.DataOperationMixIn, hook.Operation):
def precommit_event(self):
self.__processed = []
for source in self.get_data():
conf = source.repo_source.check_config(source)
self.__processed.append( (source, conf) )
def postcommit_event(self):
for source, conf in self.__processed:
source.repo_source.update_config(source, conf)
class SourceUpdatedHook(SourceHook):
__regid__ = 'cw.sources.configupdate'
__select__ = SourceHook.__select__ & is_instance('CWSource')
events = ('after_update_entity',)
def __call__(self):
if 'config' in self.entity.cw_edited:
SourceUpdatedOp.get_instance(self._cw).add_data(self.entity)
class SourceHostConfigUpdatedHook(SourceHook):
__regid__ = 'cw.sources.hostconfigupdate'
__select__ = SourceHook.__select__ & is_instance('CWSourceHostConfig')
events = ('after_add_entity', 'after_update_entity', 'before_delete_entity',)
def __call__(self):
if self.entity.match(gethostname()):
if self.event == 'after_update_entity' and \
not 'config' in self.entity.cw_edited:
return
try:
SourceUpdatedOp.get_instance(self._cw).add_data(self.entity.cwsource)
except IndexError:
# XXX no source linked to the host config yet
pass
# source mapping synchronization. Expect cw_for_source/cw_schema are immutable
# relations (i.e. can't change from a source or schema to another).
class SourceMappingDeleteHook(SourceHook):
"""check cw_for_source and cw_schema are immutable relations
XXX empty delete perms would be enough?
"""
__regid__ = 'cw.sources.delschemaconfig'
__select__ = SourceHook.__select__ & hook.match_rtype('cw_for_source', 'cw_schema')
events = ('before_add_relation',)
def __call__(self):
if not self._cw.added_in_transaction(self.eidfrom):
msg = self._cw._("can't change this relation")
raise ValidationError(self.eidfrom, {self.rtype: msg})
class SourceMappingChangedOp(hook.DataOperationMixIn, hook.Operation):
def check_or_update(self, checkonly):
session = self.session
# take care, can't call get_data() twice
try:
data = self.__data
except AttributeError:
data = self.__data = self.get_data()
for schemacfg, source in data:
if source is None:
source = schemacfg.cwsource.repo_source
if session.added_in_transaction(schemacfg.eid):
if not session.deleted_in_transaction(schemacfg.eid):
source.add_schema_config(schemacfg, checkonly=checkonly)
elif session.deleted_in_transaction(schemacfg.eid):
source.delete_schema_config(schemacfg, checkonly=checkonly)
else:
source.update_schema_config(schemacfg, checkonly=checkonly)
def precommit_event(self):
self.check_or_update(True)
def postcommit_event(self):
self.check_or_update(False)
class SourceMappingChangedHook(SourceHook):
__regid__ = 'cw.sources.schemaconfig'
__select__ = SourceHook.__select__ & is_instance('CWSourceSchemaConfig')
events = ('after_add_entity', 'after_update_entity')
def __call__(self):
if self.event == 'after_add_entity' or (
self.event == 'after_update_entity' and 'options' in self.entity.cw_edited):
SourceMappingChangedOp.get_instance(self._cw).add_data(
(self.entity, None) )
class SourceMappingDeleteHook(SourceHook):
__regid__ = 'cw.sources.delschemaconfig'
__select__ = SourceHook.__select__ & hook.match_rtype('cw_for_source')
events = ('before_delete_relation',)
def __call__(self):
SourceMappingChangedOp.get_instance(self._cw).add_data(
(self._cw.entity_from_eid(self.eidfrom),
self._cw.entity_from_eid(self.eidto)) )