Bring back the separate web-side entity cache
Prior to changeset 635cfac73d28 "[repoapi] fold ClientConnection into
Connection", we had two entity caches: one on the client/dbapi/web side,
and one on the server/repo side. This is a waste, but it is actually
needed as long as we have the magic _cw attribute on entities which must
sometimes be a request and sometimes a cnx. Removing the duplication
caused weird problems with entity._cw alternating between both types of
objects, which is unexpected by both the repo and the web sides.
We add an entity cache on ConnectionCubicWebRequestBase, separate from
the Connection's, and bring back the
_cw_update_attr_cache/dont-cache-attrs mechanism, to let the
server/edition code let caches know which attributes have been modified
Entity.as_rset can be cached again, as ResultSet no longer modifies the
entity when fetching it from a cache.
Contrary to the pre-3.21 code, _cw_update_attr_cache now handles web
requests and connections in the same way (otherwise the cache ends up
with wrong values if a hook modifies attributes), but dont-cache-attrs
is never set for (inlined) relations.
Closes #6863543
# copyright 2014 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/>.
"""looping task for dumping instance's stats in a file
"""
__docformat__ = "restructuredtext en"
from datetime import datetime
import json
from cubicweb.server import hook
class LogStatsStartHook(hook.Hook):
"""register task to regularly dump instance's stats in a file
data are stored as one json entry per row
"""
__regid__ = 'cubicweb.hook.logstats.start'
events = ('server_startup',)
def __call__(self):
interval = self.repo.config.get('logstat-interval', 0)
if interval <= 0:
return
def dump_stats(repo):
statsfile = repo.config.get('logstat-file')
with repo.internal_cnx() as cnx:
stats = cnx.call_service('repo_stats')
gcstats = cnx.call_service('repo_gc_stats', nmax=5)
allstats = {'resources': stats,
'memory': gcstats,
'timestamp': datetime.utcnow().isoformat(),
}
try:
with open(statsfile, 'ab') as ofile:
json.dump(allstats, ofile)
ofile.write('\n')
except IOError:
repo.warning('Cannot open stats file for writing: %s', statsfile)
self.repo.looping_task(interval, dump_stats, self.repo)