[schema migration] import refactoring to fix #1109558 and enhances things on the way
the main pb demonstrated by #1109558 was due to the fact that in-memory schema
was updated in commit_event of operations. This is undesired in most cases,
since we want the modification to be taken into account in the interval between
the modification detection and the commit_event.
I've fixed this by merging in-memory schema / database alteration operations
for most important changes, doing in-memory schema changes as they are detected
and implementing a revertcommit_event method to revert them if necessary (with
exception for removal of stuff from the schema, where this is simply done in a
postcommit_event methods).
Also, I've benefited from this to support reverting of database alteration for
some operations (more to be done there), and to move so system source alteration
code to the native source code for a nicer design.
There may be some more stuff in syncschema.py that would benefit from similar
changes, but most important things are done (at least to close #1109558, w/
unittest_syncschema and unittest_migration green).
# copyright 2003-2010 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/>.
import os
import sys
try:
import win32serviceutil
import win32service
except ImportError:
print 'Win32 extensions for Python are likely not installed.'
sys.exit(3)
from cubicweb.etwist.server import (CubicWebRootResource, reactor, server)
import logging
from logging import getLogger, handlers
from cubicweb import set_log_methods
from cubicweb.cwconfig import CubicWebConfiguration as cwcfg
def _check_env(env):
env_vars = ('CW_INSTANCES_DIR', 'CW_INSTANCES_DATA_DIR', 'CW_RUNTIME_DIR')
for var in env_vars:
if var not in env:
raise Exception('The environment variables %s must be set.' % \
', '.join(env_vars))
if not env.get('USERNAME'):
env['USERNAME'] = 'cubicweb'
class CWService(object, win32serviceutil.ServiceFramework):
_svc_name_ = None
_svc_display_name_ = None
instance = None
def __init__(self, *args, **kwargs):
win32serviceutil.ServiceFramework.__init__(self, *args, **kwargs)
cwcfg.load_cwctl_plugins()
logger = getLogger('cubicweb')
set_log_methods(CubicWebRootResource, logger)
def SvcStop(self):
self.ReportServiceStatus(win32service.SERVICE_STOP_PENDING)
logger = getLogger('cubicweb.twisted')
logger.info('stopping %s service' % self.instance)
reactor.stop()
self.ReportServiceStatus(win32service.SERVICE_STOP_PENDING)
def SvcDoRun(self):
self.ReportServiceStatus(win32service.SERVICE_START_PENDING)
logger = getLogger('cubicweb.twisted')
handler = handlers.NTEventLogHandler('cubicweb')
handler.setLevel(logging.INFO)
logger.addHandler(handler)
logger.info('starting %s service' % self.instance)
try:
_check_env(os.environ)
# create the site
config = cwcfg.config_for(self.instance)
config.init_log(force=True)
logger.info('starting cubicweb instance %s ', self.instance)
root_resource = CubicWebRootResource(config, False)
website = server.Site(root_resource)
# serve it via standard HTTP on port set in the configuration
port = config['port'] or 8080
logger.info('listening on port %s' % port)
reactor.listenTCP(port, website)
root_resource.init_publisher()
root_resource.start_service()
logger.info('instance started on %s', root_resource.base_url)
self.ReportServiceStatus(win32service.SERVICE_RUNNING)
reactor.run()
except Exception, e:
logger.error('service %s stopped (cause: %s)' % (self.instance, e))
logger.exception('what happened ...')
self.ReportServiceStatus(win32service.SERVICE_STOPPED)