128 lines
4.7 KiB
Python
128 lines
4.7 KiB
Python
# Copyright (c) 2014 Rackspace Hosting
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# All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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"""Unit tests for SQLAlchemy and eventlet interaction."""
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import logging
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import unittest2
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from oslo_utils import importutils
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import sqlalchemy as sa
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from sqlalchemy.ext import declarative as sa_decl
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from oslo_db import exception as db_exc
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from oslo_db.sqlalchemy import models
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from oslo_db import tests
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from oslo_db.tests.sqlalchemy import base as test_base
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class EventletTestMixin(object):
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def setUp(self):
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super(EventletTestMixin, self).setUp()
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BASE = sa_decl.declarative_base()
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class TmpTable(BASE, models.ModelBase):
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__tablename__ = 'test_async_eventlet'
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id = sa.Column('id', sa.Integer, primary_key=True, nullable=False)
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foo = sa.Column('foo', sa.Integer)
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__table_args__ = (
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sa.UniqueConstraint('foo', name='uniq_foo'),
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)
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self.test_table = TmpTable
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TmpTable.__table__.create(self.engine)
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self.addCleanup(lambda: TmpTable.__table__.drop(self.engine))
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@unittest2.skipIf(not tests.should_run_eventlet_tests(),
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'eventlet tests disabled unless TEST_EVENTLET=1')
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def test_concurrent_transaction(self):
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# Cause sqlalchemy to log executed SQL statements. Useful to
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# determine exactly what and when was sent to DB.
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sqla_logger = logging.getLogger('sqlalchemy.engine')
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sqla_logger.setLevel(logging.INFO)
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self.addCleanup(sqla_logger.setLevel, logging.NOTSET)
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def operate_on_row(name, ready=None, proceed=None):
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logging.debug('%s starting', name)
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_session = self.sessionmaker()
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with _session.begin():
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logging.debug('%s ready', name)
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# Modify the same row, inside transaction
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tbl = self.test_table()
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tbl.update({'foo': 10})
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tbl.save(_session)
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if ready is not None:
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ready.send()
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if proceed is not None:
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logging.debug('%s waiting to proceed', name)
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proceed.wait()
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logging.debug('%s exiting transaction', name)
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logging.debug('%s terminating', name)
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return True
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eventlet = importutils.try_import('eventlet')
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if eventlet is None:
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return self.skipTest('eventlet is required for this test')
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a_ready = eventlet.event.Event()
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a_proceed = eventlet.event.Event()
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b_proceed = eventlet.event.Event()
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# thread A opens transaction
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logging.debug('spawning A')
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a = eventlet.spawn(operate_on_row, 'A',
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ready=a_ready, proceed=a_proceed)
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logging.debug('waiting for A to enter transaction')
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a_ready.wait()
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# thread B opens transaction on same row
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logging.debug('spawning B')
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b = eventlet.spawn(operate_on_row, 'B',
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proceed=b_proceed)
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logging.debug('waiting for B to (attempt to) enter transaction')
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eventlet.sleep(1) # should(?) advance B to blocking on transaction
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# While B is still blocked, A should be able to proceed
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a_proceed.send()
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# Will block forever(*) if DB library isn't reentrant.
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# (*) Until some form of timeout/deadlock detection kicks in.
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# This is the key test that async is working. If this hangs
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# (or raises a timeout/deadlock exception), then you have failed
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# this test.
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self.assertTrue(a.wait())
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b_proceed.send()
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# If everything proceeded without blocking, B will throw a
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# "duplicate entry" exception when it tries to insert the same row
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self.assertRaises(db_exc.DBDuplicateEntry, b.wait)
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# Note that sqlite fails the above concurrency tests, and is not
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# mentioned below.
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# ie: This file performs no tests by default.
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class MySQLEventletTestCase(EventletTestMixin,
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test_base._MySQLOpportunisticTestCase):
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pass
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class PostgreSQLEventletTestCase(EventletTestMixin,
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test_base._PostgreSQLOpportunisticTestCase):
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pass
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