Make test database template creation concurrent
build_db_cache() is used in tests to create test database templates, i.e.
DEFAULT_EMPTY_DB_ID (which is __default_empty_db__) and custom template
database using CubicwebTC test_db_id/pre_setup_database API.
When running tests in parallel using multiple processes, build_db_cache() may
try to build the same database twice. Avoid this by adding synchronisation of
process by using a file lock.
So when two processes require the same template database, one build the
database and others wait it to be created.
Use filelock (https://github.com/benediktschmitt/py-filelock) library to have a
portable (unix / windows) way for handling locks.
Also filelock is packaged in debian: https://packages.debian.org/source/python-filelock
# copyright 2003-2013 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/>.
"""dummy wsgi server for CubicWeb web instances"""
import socket
from cubicweb.wsgi.handler import CubicWebWSGIApplication
from cubicweb import ConfigurationError
from werkzeug.serving import run_simple
from logging import getLogger
LOGGER = getLogger('cubicweb')
def run(config):
config.check_writeable_uid_directory(config.appdatahome)
port = config['port'] or 8080
interface = config['interface']
app = CubicWebWSGIApplication(config)
repo = app.appli.repo
try:
LOGGER.info('starting http server on %s', config['base-url'])
run_simple(interface, port, app,
threaded=True,
use_debugger=True,
processes=1) # more processes yield weird errors
finally:
repo.shutdown()