{ "info": { "author": "Michal Wegrzynek", "author_email": "mwegrzynek@litexservice.pl", "bugtrack_url": null, "classifiers": [ "Programming Language :: Python", "Topic :: Database :: Front-Ends" ], "description": "litex.cxpool - a SQLAlchemy pool with native Oracle session pooling\n===================================================================\n\nCxOracleSessionPool is a subclass of SQLAlchemy's NullPool, with functionality close\nto QueuePool. It's major selling point is the ability to run in proxy authentication\nmode. In this mode, the session pool is constructed with one set of credentials and\nindividual connections can by acquired from it, authenticated for a different user.\n\nIt's being used in Pyramid applications interfacing with an ERP system with all logic,\nauditing and security contained in Oracle DB stored procedures.\n\nExample usage:\n\n>>> from litex.cxpool import CxOracleSessionPool\n>>> def get_user():\n... return 'REAL_USER'\n\nget_user is a callable returning login of a user we would like to connect as.\nTo connect to db as currently authenticated user in Pyramid, this\nfunction could look like the one below (prefix is used to find the right type of principals,\nand exclude the system. ones e.g. system.Everyone):\n\n>>> from pyramid.threadlocal import get_current_request\n>>> from pyramid.interfaces import IAuthenticationPolicy\n>>> prefix = 'example.'\n>>> def get_user():\n... req = get_current_request()\n... auth = req.registry.queryUtility(IAuthenticationPolicy)\n... prc = [pr for pr in auth.effective_principals(req) if pr.startswith(prefix)]\n... if prc:\n... return prc[0].split('.')[-1]\n... else:\n... return None\n\nHaving the user source, we can construct the pool:\n\n>>> pool = CxOracleSessionPool(\n... 'oracle://proxy_user:proxy_password@test_server/test',\n... min_sessions=1,\n... max_sessions=5,\n... increment=1,\n... user_source=get_user\n... )\n\n * First parameter is a database URL with proxy user credentials.\n * min_sessions controls, how many sessions are constructed initially (in contrast to SA QueuePool this pool precreates sessions)\n * max_sessions sets the upper cap of constructed sessions count (think about it as QP pool_size + max_overflow)\n * increment sets how many sessions to create when current session count is too low (up to max_sessions)\n\nTo allow REAL_USER to connect to the db through PROXY_USER, one have to issue the following statement as DBA:\n\nsql> alter user REAL_USER grant connect through PROXY_USER;\n\nHaving the pool ready, we can construct a SQLAlchemy engine\n\n>>> from sqlalchemy import create_engine\n>>> engine = create_engine('oracle://', pool=pool)\n\nand use it as any other SA engine:\n\n>>> conn = engine.connect()\n>>> res = 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