Mercurial > libervia-backend
annotate sat/tools/common/dynamic_import.py @ 2787:298408833ec2
memory (sqlite): optimizations
indexes were missing on foreign keys for "message", "subject" and "thread" tables, seriously impacting performances.
In addition to those indexes, two indexes have been added to speed ordering by timestamp on "history", and one on "files" table.
history.rowid is not used anymore as there is an index on (profile_id, received_timestamp) which will speed up the query.
Primary keys order has been changed to use automatic index in most common cases (filtering by profile_id then namespace).
author | Goffi <goffi@goffi.org> |
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date | Sat, 19 Jan 2019 22:49:32 +0100 |
parents | 003b8b4b56a7 |
children | ab2696e34d29 |
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1 #!/usr/bin/env python2 |
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2 # -*- coding: utf-8 -*- |
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3 |
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4 # SàT: a XMPP |
2771 | 5 # Copyright (C) 2009-2019 Jérôme Poisson (goffi@goffi.org) |
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6 |
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7 # This program is free software: you can redistribute it and/or modify |
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8 # it under the terms of the GNU Affero General Public License as published by |
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9 # the Free Software Foundation, either version 3 of the License, or |
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10 # (at your option) any later version. |
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11 |
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12 # This program is distributed in the hope that it will be useful, |
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13 # but WITHOUT ANY WARRANTY; without even the implied warranty of |
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14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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15 # GNU Affero General Public License for more details. |
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16 |
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17 # You should have received a copy of the GNU Affero General Public License |
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18 # along with this program. If not, see <http://www.gnu.org/licenses/>. |
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19 |
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20 """ tools dynamic import """ |
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21 |
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22 from importlib import import_module |
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23 |
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24 |
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25 def bridge(name, module_path="sat.bridge"): |
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26 """Import bridge module |
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27 |
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28 @param module_path(str): path of the module to import |
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29 @param name(str): name of the bridge to import (e.g.: dbus) |
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30 @return (module, None): imported module or None if nothing is found |
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31 """ |
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32 try: |
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33 bridge_module = import_module(module_path + "." + name) |
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34 except ImportError: |
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35 try: |
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36 bridge_module = import_module(module_path + "." + name + "_bridge") |
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37 except ImportError: |
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38 bridge_module = None |
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39 return bridge_module |