Update SQLAlchemy

libs/sqlalchemy/dialects/mysql/gaerdbms.py

@@ -0,0 +1,84 @@
+# mysql/gaerdbms.py
+# Copyright (C) 2005-2013 the SQLAlchemy authors and contributors <see AUTHORS file>
+#
+# This module is part of SQLAlchemy and is released under
+# the MIT License: http://www.opensource.org/licenses/mit-license.php
+"""Support for Google Cloud SQL on Google App Engine.
+
+This dialect is based primarily on the :mod:`.mysql.mysqldb` dialect with minimal
+changes.
+
+.. versionadded:: 0.7.8
+
+Connecting
+----------
+
+Connect string format::
+
+    mysql+gaerdbms:///<dbname>
+
+E.g.::
+
+  create_engine('mysql+gaerdbms:///mydb',
+                 connect_args={"instance":"instancename"})
+
+Pooling
+-------
+
+Google App Engine connections appear to be randomly recycled,
+so the dialect does not pool connections.  The :class:`.NullPool`
+implementation is installed within the :class:`.Engine` by
+default.
+
+"""
+
+from sqlalchemy.dialects.mysql.mysqldb import MySQLDialect_mysqldb
+from sqlalchemy.pool import NullPool
+import re
+
+
+class MySQLDialect_gaerdbms(MySQLDialect_mysqldb):
+
+    @classmethod
+    def dbapi(cls):
+        # from django:
+        # http://code.google.com/p/googleappengine/source/
+        #     browse/trunk/python/google/storage/speckle/
+        #     python/django/backend/base.py#118
+        # see also [ticket:2649]
+        # see also http://stackoverflow.com/q/14224679/34549
+        from google.appengine.api import apiproxy_stub_map
+
+        if apiproxy_stub_map.apiproxy.GetStub('rdbms'):
+            from google.storage.speckle.python.api import rdbms_apiproxy
+            return rdbms_apiproxy
+        else:
+            from google.storage.speckle.python.api import rdbms_googleapi
+            return rdbms_googleapi
+
+    @classmethod
+    def get_pool_class(cls, url):
+        # Cloud SQL connections die at any moment
+        return NullPool
+
+    def create_connect_args(self, url):
+        opts = url.translate_connect_args()
+        # 'dsn' and 'instance' are because we are skipping
+        # the traditional google.api.rdbms wrapper
+
+        opts['dsn'] = ''
+        opts['instance'] = url.query['instance']
+        return [], opts
+
+    def _extract_error_code(self, exception):
+        match = re.compile(r"^(\d+):").match(str(exception))
+        # The rdbms api will wrap then re-raise some types of errors
+        # making this regex return no matches.
+        if match:
+            code = match.group(1)
+        else:
+            code = None
+        if code:
+            return int(code)
+
+dialect = MySQLDialect_gaerdbms