hooks/__init__.py
author Julien Cristau <julien.cristau@logilab.fr>
Fri, 20 Feb 2015 16:17:51 +0100
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[web/views] add text/n3 rdf view Less shit than xml.
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# copyright 2003-2014 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
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# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
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#
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# This file is part of CubicWeb.
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#
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# CubicWeb is free software: you can redistribute it and/or modify it under the
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# terms of the GNU Lesser General Public License as published by the Free
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# Software Foundation, either version 2.1 of the License, or (at your option)
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# any later version.
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#
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# CubicWeb is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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# FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
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# details.
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#
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# You should have received a copy of the GNU Lesser General Public License along
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# with CubicWeb.  If not, see <http://www.gnu.org/licenses/>.
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"""core hooks registering some maintainance tasks as server startup time"""
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__docformat__ = "restructuredtext en"
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from datetime import timedelta, datetime
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from cubicweb.server import hook
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class TransactionsCleanupStartupHook(hook.Hook):
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    """start task to cleanup transaction data"""
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    __regid__ = 'cw.looping-tasks.transactions-cleanup'
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    events = ('server_startup',)
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    def __call__(self):
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        # XXX use named args and inner functions to avoid referencing globals
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        # which may cause reloading pb
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        lifetime = timedelta(days=self.repo.config['keep-transaction-lifetime'])
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        def cleanup_old_transactions(repo=self.repo, lifetime=lifetime):
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            mindate = datetime.now() - lifetime
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            with repo.internal_cnx() as cnx:
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                cnx.system_sql(
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                    'DELETE FROM transactions WHERE tx_time < %(time)s',
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                    {'time': mindate})
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                cnx.commit()
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        if self.repo.config['undo-enabled']:
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            self.repo.looping_task(60*60*24, cleanup_old_transactions,
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                                   self.repo)
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class UpdateFeedsStartupHook(hook.Hook):
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    """start task to update datafeed based sources"""
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    __regid__ = 'cw.looping-tasks.update-feeds'
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    events = ('server_startup',)
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    def __call__(self):
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        def update_feeds(repo):
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            # take a list to avoid iterating on a dictionary whose size may
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            # change
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            for uri, source in list(repo.sources_by_uri.iteritems()):
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                if (uri == 'system'
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                    or not repo.config.source_enabled(source)
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                    or not source.config['synchronize']):
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                    continue
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                with repo.internal_cnx() as cnx:
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                    try:
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                        source.pull_data(cnx)
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                    except Exception as exc:
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                        cnx.exception('while trying to update feed %s', source)
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        self.repo.looping_task(60, update_feeds, self.repo)
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class DataImportsCleanupStartupHook(hook.Hook):
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    """start task to cleanup old data imports (ie datafeed import logs)"""
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    __regid__ = 'cw.looping-tasks.dataimports-cleanup'
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    events = ('server_startup',)
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    def __call__(self):
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        def expire_dataimports(repo=self.repo):
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            for uri, source in repo.sources_by_uri.iteritems():
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                if (uri == 'system'
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                    or not repo.config.source_enabled(source)):
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                    continue
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                with repo.internal_cnx() as cnx:
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                    mindate = datetime.now() - timedelta(seconds=source.config['logs-lifetime'])
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                    cnx.execute('DELETE CWDataImport X WHERE X start_timestamp < %(time)s',
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                                    {'time': mindate})
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                    cnx.commit()
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        self.repo.looping_task(60*60*24, expire_dataimports, self.repo)