[server] Make connection pooler configurable and set better default values
Drop the configuration connections-pool-size and add new configurations options:
* connections-pool-min-size. Set to 0 by default so we open connections only
when needed. This avoid opening min-size*processes connections at startup,
which is, it think, a good default.
* connections-pool-max-size. Set to 0 (unlimited) by default, so we move the
bottleneck to postgresql.
* connections-idle-timeout. Set to 10 minutes. I don't have arguments about
this except that this is the default in pgbouncer.
# 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"""
from cubicweb.wsgi.handler import CubicWebWSGIApplication
from cubicweb import ConfigurationError
from wsgiref import simple_server
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)
handler_cls = simple_server.WSGIRequestHandler
httpd = simple_server.WSGIServer((interface, port), handler_cls)
httpd.set_app(app)
repo = app.appli.repo
try:
LOGGER.info('starting http server on %s', config['base-url'])
httpd.serve_forever()
finally:
repo.shutdown()