445 lines
12 KiB
Python
445 lines
12 KiB
Python
# testing/engines.py
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# Copyright (C) 2005-2021 the SQLAlchemy authors and contributors
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# <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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from __future__ import absolute_import
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import collections
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import re
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import warnings
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import weakref
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from . import config
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from .util import decorator
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from .util import gc_collect
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from .. import event
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from .. import pool
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class ConnectionKiller(object):
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def __init__(self):
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self.proxy_refs = weakref.WeakKeyDictionary()
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self.testing_engines = collections.defaultdict(set)
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self.dbapi_connections = set()
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def add_pool(self, pool):
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event.listen(pool, "checkout", self._add_conn)
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event.listen(pool, "checkin", self._remove_conn)
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event.listen(pool, "close", self._remove_conn)
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event.listen(pool, "close_detached", self._remove_conn)
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# note we are keeping "invalidated" here, as those are still
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# opened connections we would like to roll back
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def _add_conn(self, dbapi_con, con_record, con_proxy):
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self.dbapi_connections.add(dbapi_con)
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self.proxy_refs[con_proxy] = True
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def _remove_conn(self, dbapi_conn, *arg):
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self.dbapi_connections.discard(dbapi_conn)
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def add_engine(self, engine, scope):
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self.add_pool(engine.pool)
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assert scope in ("class", "global", "function", "fixture")
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self.testing_engines[scope].add(engine)
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def _safe(self, fn):
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try:
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fn()
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except Exception as e:
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warnings.warn(
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"testing_reaper couldn't rollback/close connection: %s" % e
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)
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def rollback_all(self):
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for rec in list(self.proxy_refs):
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if rec is not None and rec.is_valid:
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self._safe(rec.rollback)
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def checkin_all(self):
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# run pool.checkin() for all ConnectionFairy instances we have
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# tracked.
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for rec in list(self.proxy_refs):
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if rec is not None and rec.is_valid:
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self.dbapi_connections.discard(rec.connection)
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self._safe(rec._checkin)
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# for fairy refs that were GCed and could not close the connection,
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# such as asyncio, roll back those remaining connections
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for con in self.dbapi_connections:
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self._safe(con.rollback)
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self.dbapi_connections.clear()
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def close_all(self):
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self.checkin_all()
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def prepare_for_drop_tables(self, connection):
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# don't do aggressive checks for third party test suites
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if not config.bootstrapped_as_sqlalchemy:
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return
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from . import provision
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provision.prepare_for_drop_tables(connection.engine.url, connection)
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def _drop_testing_engines(self, scope):
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eng = self.testing_engines[scope]
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for rec in list(eng):
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for proxy_ref in list(self.proxy_refs):
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if proxy_ref is not None and proxy_ref.is_valid:
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if (
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proxy_ref._pool is not None
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and proxy_ref._pool is rec.pool
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):
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self._safe(proxy_ref._checkin)
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rec.dispose()
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eng.clear()
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def after_test(self):
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self._drop_testing_engines("function")
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def after_test_outside_fixtures(self, test):
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# don't do aggressive checks for third party test suites
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if not config.bootstrapped_as_sqlalchemy:
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return
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if test.__class__.__leave_connections_for_teardown__:
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return
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self.checkin_all()
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# on PostgreSQL, this will test for any "idle in transaction"
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# connections. useful to identify tests with unusual patterns
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# that can't be cleaned up correctly.
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from . import provision
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with config.db.connect() as conn:
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provision.prepare_for_drop_tables(conn.engine.url, conn)
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def stop_test_class_inside_fixtures(self):
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self.checkin_all()
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self._drop_testing_engines("function")
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self._drop_testing_engines("class")
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def stop_test_class_outside_fixtures(self):
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# ensure no refs to checked out connections at all.
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if pool.base._strong_ref_connection_records:
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gc_collect()
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if pool.base._strong_ref_connection_records:
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ln = len(pool.base._strong_ref_connection_records)
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pool.base._strong_ref_connection_records.clear()
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assert (
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False
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), "%d connection recs not cleared after test suite" % (ln)
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def final_cleanup(self):
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self.checkin_all()
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for scope in self.testing_engines:
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self._drop_testing_engines(scope)
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def assert_all_closed(self):
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for rec in self.proxy_refs:
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if rec.is_valid:
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assert False
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testing_reaper = ConnectionKiller()
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@decorator
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def assert_conns_closed(fn, *args, **kw):
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try:
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fn(*args, **kw)
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finally:
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testing_reaper.assert_all_closed()
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@decorator
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def rollback_open_connections(fn, *args, **kw):
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"""Decorator that rolls back all open connections after fn execution."""
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try:
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fn(*args, **kw)
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finally:
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testing_reaper.rollback_all()
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@decorator
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def close_first(fn, *args, **kw):
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"""Decorator that closes all connections before fn execution."""
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testing_reaper.checkin_all()
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fn(*args, **kw)
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@decorator
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def close_open_connections(fn, *args, **kw):
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"""Decorator that closes all connections after fn execution."""
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try:
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fn(*args, **kw)
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finally:
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testing_reaper.checkin_all()
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def all_dialects(exclude=None):
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import sqlalchemy.dialects as d
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for name in d.__all__:
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# TEMPORARY
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if exclude and name in exclude:
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continue
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mod = getattr(d, name, None)
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if not mod:
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mod = getattr(
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__import__("sqlalchemy.dialects.%s" % name).dialects, name
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)
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yield mod.dialect()
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class ReconnectFixture(object):
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def __init__(self, dbapi):
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self.dbapi = dbapi
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self.connections = []
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self.is_stopped = False
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def __getattr__(self, key):
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return getattr(self.dbapi, key)
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def connect(self, *args, **kwargs):
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conn = self.dbapi.connect(*args, **kwargs)
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if self.is_stopped:
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self._safe(conn.close)
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curs = conn.cursor() # should fail on Oracle etc.
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# should fail for everything that didn't fail
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# above, connection is closed
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curs.execute("select 1")
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assert False, "simulated connect failure didn't work"
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else:
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self.connections.append(conn)
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return conn
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def _safe(self, fn):
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try:
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fn()
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except Exception as e:
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warnings.warn("ReconnectFixture couldn't close connection: %s" % e)
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def shutdown(self, stop=False):
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# TODO: this doesn't cover all cases
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# as nicely as we'd like, namely MySQLdb.
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# would need to implement R. Brewer's
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# proxy server idea to get better
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# coverage.
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self.is_stopped = stop
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for c in list(self.connections):
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self._safe(c.close)
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self.connections = []
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def restart(self):
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self.is_stopped = False
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def reconnecting_engine(url=None, options=None):
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url = url or config.db.url
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dbapi = config.db.dialect.dbapi
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if not options:
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options = {}
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options["module"] = ReconnectFixture(dbapi)
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engine = testing_engine(url, options)
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_dispose = engine.dispose
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def dispose():
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engine.dialect.dbapi.shutdown()
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engine.dialect.dbapi.is_stopped = False
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_dispose()
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engine.test_shutdown = engine.dialect.dbapi.shutdown
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engine.test_restart = engine.dialect.dbapi.restart
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engine.dispose = dispose
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return engine
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def testing_engine(
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url=None,
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options=None,
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future=None,
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asyncio=False,
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transfer_staticpool=False,
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):
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"""Produce an engine configured by --options with optional overrides."""
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if asyncio:
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from sqlalchemy.ext.asyncio import create_async_engine as create_engine
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elif future or (
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config.db and config.db._is_future and future is not False
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):
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from sqlalchemy.future import create_engine
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else:
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from sqlalchemy import create_engine
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from sqlalchemy.engine.url import make_url
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if not options:
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use_reaper = True
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scope = "function"
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else:
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use_reaper = options.pop("use_reaper", True)
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scope = options.pop("scope", "function")
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url = url or config.db.url
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url = make_url(url)
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if options is None:
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if config.db is None or url.drivername == config.db.url.drivername:
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options = config.db_opts
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else:
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options = {}
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elif config.db is not None and url.drivername == config.db.url.drivername:
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default_opt = config.db_opts.copy()
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default_opt.update(options)
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engine = create_engine(url, **options)
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if transfer_staticpool:
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from sqlalchemy.pool import StaticPool
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if config.db is not None and isinstance(config.db.pool, StaticPool):
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engine.pool._transfer_from(config.db.pool)
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if scope == "global":
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if asyncio:
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engine.sync_engine._has_events = True
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else:
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engine._has_events = (
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True # enable event blocks, helps with profiling
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)
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if isinstance(engine.pool, pool.QueuePool):
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engine.pool._timeout = 0
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engine.pool._max_overflow = 0
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if use_reaper:
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testing_reaper.add_engine(engine, scope)
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return engine
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def mock_engine(dialect_name=None):
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"""Provides a mocking engine based on the current testing.db.
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This is normally used to test DDL generation flow as emitted
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by an Engine.
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It should not be used in other cases, as assert_compile() and
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assert_sql_execution() are much better choices with fewer
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moving parts.
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"""
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from sqlalchemy import create_mock_engine
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if not dialect_name:
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dialect_name = config.db.name
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buffer = []
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def executor(sql, *a, **kw):
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buffer.append(sql)
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def assert_sql(stmts):
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recv = [re.sub(r"[\n\t]", "", str(s)) for s in buffer]
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assert recv == stmts, recv
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def print_sql():
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d = engine.dialect
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return "\n".join(str(s.compile(dialect=d)) for s in engine.mock)
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engine = create_mock_engine(dialect_name + "://", executor)
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assert not hasattr(engine, "mock")
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engine.mock = buffer
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engine.assert_sql = assert_sql
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engine.print_sql = print_sql
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return engine
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class DBAPIProxyCursor(object):
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"""Proxy a DBAPI cursor.
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Tests can provide subclasses of this to intercept
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DBAPI-level cursor operations.
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"""
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def __init__(self, engine, conn, *args, **kwargs):
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self.engine = engine
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self.connection = conn
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self.cursor = conn.cursor(*args, **kwargs)
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def execute(self, stmt, parameters=None, **kw):
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if parameters:
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return self.cursor.execute(stmt, parameters, **kw)
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else:
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return self.cursor.execute(stmt, **kw)
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def executemany(self, stmt, params, **kw):
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return self.cursor.executemany(stmt, params, **kw)
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def __iter__(self):
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return iter(self.cursor)
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def __getattr__(self, key):
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return getattr(self.cursor, key)
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class DBAPIProxyConnection(object):
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"""Proxy a DBAPI connection.
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Tests can provide subclasses of this to intercept
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DBAPI-level connection operations.
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"""
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def __init__(self, engine, cursor_cls):
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self.conn = engine.pool._creator()
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self.engine = engine
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self.cursor_cls = cursor_cls
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def cursor(self, *args, **kwargs):
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return self.cursor_cls(self.engine, self.conn, *args, **kwargs)
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def close(self):
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self.conn.close()
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def __getattr__(self, key):
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return getattr(self.conn, key)
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def proxying_engine(
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conn_cls=DBAPIProxyConnection, cursor_cls=DBAPIProxyCursor
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):
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"""Produce an engine that provides proxy hooks for
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common methods.
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"""
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def mock_conn():
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return conn_cls(config.db, cursor_cls)
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def _wrap_do_on_connect(do_on_connect):
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def go(dbapi_conn):
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return do_on_connect(dbapi_conn.conn)
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return go
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return testing_engine(
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options={
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"creator": mock_conn,
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"_wrap_do_on_connect": _wrap_do_on_connect,
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}
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)
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