mirror of
https://github.com/janeczku/calibre-web
synced 2024-12-21 07:30:30 +00:00
85 lines
2.7 KiB
Python
85 lines
2.7 KiB
Python
|
# 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
|
||
|
|
"""
|
||
|
|
.. dialect:: mysql+gaerdbms
|
||
|
|
:name: Google Cloud SQL
|
||
|
|
:dbapi: rdbms
|
||
|
|
:connectstring: mysql+gaerdbms:///<dbname>?instance=<instancename>
|
||
|
|
:url: https://developers.google.com/appengine/docs/python/cloud-sql/developers-guide
|
||
|
|
|
||
|
|
This dialect is based primarily on the :mod:`.mysql.mysqldb` dialect with minimal
|
||
|
|
changes.
|
||
|
|
|
||
|
|
.. versionadded:: 0.7.8
|
||
|
|
|
||
|
|
|
||
|
|
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.
|
||
|
|
|
||
|
|
"""
|
||
|
|
|
||
|
|
import os
|
||
|
|
|
||
|
|
from .mysqldb import MySQLDialect_mysqldb
|
||
|
|
from ...pool import NullPool
|
||
|
|
import re
|
||
|
|
|
||
|
|
|
||
|
|
def _is_dev_environment():
|
||
|
|
return os.environ.get('SERVER_SOFTWARE', '').startswith('Development/')
|
||
|
|
|
||
|
|
|
||
|
|
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 _is_dev_environment():
|
||
|
|
from google.appengine.api import rdbms_mysqldb
|
||
|
|
return rdbms_mysqldb
|
||
|
|
elif 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()
|
||
|
|
if not _is_dev_environment():
|
||
|
|
# '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+)L?:|^\((\d+)L?,").match(str(exception))
|
||
|
|
# The rdbms api will wrap then re-raise some types of errors
|
||
|
|
# making this regex return no matches.
|
||
|
|
code = match.group(1) or match.group(2) if match else None
|
||
|
|
if code:
|
||
|
|
return int(code)
|
||
|
|
|
||
|
|
dialect = MySQLDialect_gaerdbms
|