[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 2017 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
# copyright 2014-2016 UNLISH S.A.S. (Montpellier, 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/>.
from pyramid.httpexceptions import HTTPNotFound
from cubicweb import rdf
def negociate_mime_type(request, possible_mimetypes):
accepted_headers_by_weight = sorted(
request.accept.parsed or [], key=lambda h: h[1], reverse=True
)
mime_type_negociated = None
for parsed_header in accepted_headers_by_weight:
accepted_mime_type = parsed_header[0]
if accepted_mime_type in possible_mimetypes:
mime_type_negociated = accepted_mime_type
break
return mime_type_negociated
def rdf_context_from_eid(request):
mime_type = negociate_mime_type(request, rdf.RDF_MIMETYPE_TO_FORMAT)
if mime_type is None:
raise HTTPNotFound()
entity = request.cw_request.entity_from_eid(request.matchdict['eid'])
return RDFResource(entity, mime_type)
class RDFResource:
def __init__(self, entity, mime_type):
self.entity = entity
self.mime_type = mime_type