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85 lines
2.7 KiB
Python
85 lines
2.7 KiB
Python
10 years ago
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# mysql/gaerdbms.py
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# Copyright (C) 2005-2013 the SQLAlchemy authors and contributors <see AUTHORS file>
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#
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# This module is part of SQLAlchemy and is released under
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# the MIT License: http://www.opensource.org/licenses/mit-license.php
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"""
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.. dialect:: mysql+gaerdbms
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:name: Google Cloud SQL
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:dbapi: rdbms
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:connectstring: mysql+gaerdbms:///<dbname>?instance=<instancename>
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:url: https://developers.google.com/appengine/docs/python/cloud-sql/developers-guide
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This dialect is based primarily on the :mod:`.mysql.mysqldb` dialect with minimal
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changes.
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.. versionadded:: 0.7.8
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Pooling
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-------
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Google App Engine connections appear to be randomly recycled,
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so the dialect does not pool connections. The :class:`.NullPool`
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implementation is installed within the :class:`.Engine` by
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default.
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"""
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import os
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from .mysqldb import MySQLDialect_mysqldb
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from ...pool import NullPool
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import re
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def _is_dev_environment():
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return os.environ.get('SERVER_SOFTWARE', '').startswith('Development/')
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class MySQLDialect_gaerdbms(MySQLDialect_mysqldb):
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@classmethod
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def dbapi(cls):
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# from django:
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# http://code.google.com/p/googleappengine/source/
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# browse/trunk/python/google/storage/speckle/
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# python/django/backend/base.py#118
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# see also [ticket:2649]
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# see also http://stackoverflow.com/q/14224679/34549
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from google.appengine.api import apiproxy_stub_map
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if _is_dev_environment():
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from google.appengine.api import rdbms_mysqldb
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return rdbms_mysqldb
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elif apiproxy_stub_map.apiproxy.GetStub('rdbms'):
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from google.storage.speckle.python.api import rdbms_apiproxy
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return rdbms_apiproxy
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else:
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from google.storage.speckle.python.api import rdbms_googleapi
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return rdbms_googleapi
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@classmethod
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def get_pool_class(cls, url):
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# Cloud SQL connections die at any moment
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return NullPool
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def create_connect_args(self, url):
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opts = url.translate_connect_args()
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if not _is_dev_environment():
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# 'dsn' and 'instance' are because we are skipping
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# the traditional google.api.rdbms wrapper
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opts['dsn'] = ''
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opts['instance'] = url.query['instance']
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return [], opts
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def _extract_error_code(self, exception):
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match = re.compile(r"^(\d+)L?:|^\((\d+)L?,").match(str(exception))
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# The rdbms api will wrap then re-raise some types of errors
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# making this regex return no matches.
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code = match.group(1) or match.group(2) if match else None
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if code:
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return int(code)
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dialect = MySQLDialect_gaerdbms
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