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2009 lines (1537 loc) · 55.6 KB
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import collections
import random
import threading
import time
import weakref
import sqlalchemy as tsa
from sqlalchemy import event
from sqlalchemy import pool
from sqlalchemy import select
from sqlalchemy import testing
from sqlalchemy.engine import default
from sqlalchemy.pool.impl import _AsyncConnDialect
from sqlalchemy.testing import assert_raises
from sqlalchemy.testing import assert_raises_context_ok
from sqlalchemy.testing import assert_raises_message
from sqlalchemy.testing import eq_
from sqlalchemy.testing import expect_raises
from sqlalchemy.testing import fixtures
from sqlalchemy.testing import is_
from sqlalchemy.testing import is_none
from sqlalchemy.testing import is_not
from sqlalchemy.testing import is_not_none
from sqlalchemy.testing import is_true
from sqlalchemy.testing import mock
from sqlalchemy.testing.engines import testing_engine
from sqlalchemy.testing.mock import ANY
from sqlalchemy.testing.mock import call
from sqlalchemy.testing.mock import Mock
from sqlalchemy.testing.mock import patch
from sqlalchemy.testing.util import gc_collect
from sqlalchemy.testing.util import lazy_gc
join_timeout = 10
def MockDBAPI(): # noqa
def cursor():
return Mock()
def connect(*arg, **kw):
def close():
conn.closed = True
# mock seems like it might have an issue logging
# call_count correctly under threading, not sure.
# adding a side_effect for close seems to help.
conn = Mock(
cursor=Mock(side_effect=cursor),
close=Mock(side_effect=close),
closed=False,
)
return conn
def shutdown(value):
if value:
db.connect = Mock(side_effect=Exception("connect failed"))
else:
db.connect = Mock(side_effect=connect)
db.is_shutdown = value
db = Mock(
connect=Mock(side_effect=connect), shutdown=shutdown, is_shutdown=False
)
return db
class PoolTestBase(fixtures.TestBase):
def setup_test(self):
pool.clear_managers()
self._teardown_conns = []
def teardown_test(self):
for ref in self._teardown_conns:
conn = ref()
if conn:
conn.close()
@classmethod
def teardown_test_class(cls):
pool.clear_managers()
def _with_teardown(self, connection):
self._teardown_conns.append(weakref.ref(connection))
return connection
def _queuepool_fixture(self, **kw):
dbapi, pool = self._queuepool_dbapi_fixture(**kw)
return pool
def _queuepool_dbapi_fixture(self, **kw):
dbapi = MockDBAPI()
_is_asyncio = kw.pop("_is_asyncio", False)
p = pool.QueuePool(creator=lambda: dbapi.connect("foo.db"), **kw)
if _is_asyncio:
p._is_asyncio = True
p._dialect = _AsyncConnDialect()
return dbapi, p
class PoolTest(PoolTestBase):
@testing.fails_on(
"+pyodbc", "pyodbc cursor doesn't implement tuple __eq__"
)
@testing.fails_on("+pg8000", "returns [1], not (1,)")
def test_cursor_iterable(self):
conn = testing.db.raw_connection()
cursor = conn.cursor()
cursor.execute(str(select(1).compile(testing.db)))
expected = [(1,)]
for row in cursor:
eq_(row, expected.pop(0))
def test_no_connect_on_recreate(self):
def creator():
raise Exception("no creates allowed")
for cls in (
pool.SingletonThreadPool,
pool.StaticPool,
pool.QueuePool,
pool.NullPool,
pool.AssertionPool,
):
p = cls(creator=creator)
p.dispose()
p2 = p.recreate()
assert p2.__class__ is cls
mock_dbapi = MockDBAPI()
p = cls(creator=mock_dbapi.connect)
conn = p.connect()
conn.close()
mock_dbapi.connect.side_effect = Exception("error!")
p.dispose()
p.recreate()
def test_info(self):
p = self._queuepool_fixture(pool_size=1, max_overflow=0)
c = p.connect()
self.assert_(not c.info)
self.assert_(c.info is c._connection_record.info)
c.info["foo"] = "bar"
c.close()
del c
c = p.connect()
self.assert_("foo" in c.info)
c.invalidate()
c = p.connect()
self.assert_("foo" not in c.info)
c.info["foo2"] = "bar2"
c.detach()
self.assert_("foo2" in c.info)
c2 = p.connect()
is_not(c.connection, c2.connection)
assert not c2.info
assert "foo2" in c.info
def test_rec_info(self):
p = self._queuepool_fixture(pool_size=1, max_overflow=0)
c = p.connect()
self.assert_(not c.record_info)
self.assert_(c.record_info is c._connection_record.record_info)
c.record_info["foo"] = "bar"
c.close()
del c
c = p.connect()
self.assert_("foo" in c.record_info)
c.invalidate()
c = p.connect()
self.assert_("foo" in c.record_info)
c.record_info["foo2"] = "bar2"
c.detach()
is_(c.record_info, None)
is_(c._connection_record, None)
c2 = p.connect()
assert c2.record_info
assert "foo2" in c2.record_info
def test_rec_unconnected(self):
# test production of a _ConnectionRecord with an
# initially unconnected state.
dbapi = MockDBAPI()
p1 = pool.Pool(creator=lambda: dbapi.connect("foo.db"))
r1 = pool._ConnectionRecord(p1, connect=False)
assert not r1.connection
c1 = r1.get_connection()
is_(c1, r1.connection)
def test_rec_close_reopen(self):
# test that _ConnectionRecord.close() allows
# the record to be reusable
dbapi = MockDBAPI()
p1 = pool.Pool(creator=lambda: dbapi.connect("foo.db"))
r1 = pool._ConnectionRecord(p1)
c1 = r1.connection
c2 = r1.get_connection()
is_(c1, c2)
r1.close()
assert not r1.connection
eq_(c1.mock_calls, [call.close()])
c2 = r1.get_connection()
is_not(c1, c2)
is_(c2, r1.connection)
eq_(c2.mock_calls, [])
@testing.combinations(
(
pool.QueuePool,
dict(pool_size=8, max_overflow=10, timeout=25, use_lifo=True),
),
(pool.QueuePool, {}),
(pool.NullPool, {}),
(pool.SingletonThreadPool, {}),
(pool.StaticPool, {}),
(pool.AssertionPool, {}),
)
def test_recreate_state(self, pool_cls, pool_args):
creator = object()
pool_args["pre_ping"] = True
pool_args["reset_on_return"] = "commit"
pool_args["recycle"] = 35
pool_args["logging_name"] = "somepool"
pool_args["dialect"] = default.DefaultDialect()
pool_args["echo"] = "debug"
p1 = pool_cls(creator=creator, **pool_args)
cls_keys = dir(pool_cls)
d1 = dict(p1.__dict__)
p2 = p1.recreate()
d2 = dict(p2.__dict__)
for k in cls_keys:
d1.pop(k, None)
d2.pop(k, None)
for k in (
"_invoke_creator",
"_pool",
"_overflow_lock",
"_fairy",
"_conn",
"logger",
):
if k in d2:
d2[k] = mock.ANY
eq_(d1, d2)
eq_(p1.echo, p2.echo)
is_(p1._dialect, p2._dialect)
if "use_lifo" in pool_args:
eq_(p1._pool.use_lifo, p2._pool.use_lifo)
class PoolDialectTest(PoolTestBase):
def _dialect(self):
canary = []
class PoolDialect(object):
is_async = False
def do_rollback(self, dbapi_connection):
canary.append("R")
dbapi_connection.rollback()
def do_commit(self, dbapi_connection):
canary.append("C")
dbapi_connection.commit()
def do_close(self, dbapi_connection):
canary.append("CL")
dbapi_connection.close()
return PoolDialect(), canary
def _do_test(self, pool_cls, assertion):
mock_dbapi = MockDBAPI()
dialect, canary = self._dialect()
p = pool_cls(creator=mock_dbapi.connect)
p._dialect = dialect
conn = p.connect()
conn.close()
p.dispose()
p.recreate()
conn = p.connect()
conn.close()
eq_(canary, assertion)
def test_queue_pool(self):
self._do_test(pool.QueuePool, ["R", "CL", "R"])
def test_assertion_pool(self):
self._do_test(pool.AssertionPool, ["R", "CL", "R"])
def test_singleton_pool(self):
self._do_test(pool.SingletonThreadPool, ["R", "CL", "R"])
def test_null_pool(self):
self._do_test(pool.NullPool, ["R", "CL", "R", "CL"])
def test_static_pool(self):
self._do_test(pool.StaticPool, ["R", "R"])
class PoolEventsTest(PoolTestBase):
def _first_connect_event_fixture(self):
p = self._queuepool_fixture()
canary = []
def first_connect(*arg, **kw):
canary.append("first_connect")
event.listen(p, "first_connect", first_connect)
return p, canary
def _connect_event_fixture(self):
p = self._queuepool_fixture()
canary = []
def connect(*arg, **kw):
canary.append("connect")
event.listen(p, "connect", connect)
return p, canary
def _checkout_event_fixture(self):
p = self._queuepool_fixture()
canary = []
def checkout(*arg, **kw):
canary.append("checkout")
event.listen(p, "checkout", checkout)
return p, canary
def _checkin_event_fixture(self, _is_asyncio=False):
p = self._queuepool_fixture(_is_asyncio=_is_asyncio)
canary = []
@event.listens_for(p, "checkin")
def checkin(*arg, **kw):
canary.append("checkin")
@event.listens_for(p, "close_detached")
def close_detached(*arg, **kw):
canary.append("close_detached")
@event.listens_for(p, "detach")
def detach(*arg, **kw):
canary.append("detach")
return p, canary
def _reset_event_fixture(self):
p = self._queuepool_fixture()
canary = []
def reset(*arg, **kw):
canary.append("reset")
event.listen(p, "reset", reset)
return p, canary
def _invalidate_event_fixture(self):
p = self._queuepool_fixture()
canary = Mock()
event.listen(p, "invalidate", canary)
return p, canary
def _soft_invalidate_event_fixture(self):
p = self._queuepool_fixture()
canary = Mock()
event.listen(p, "soft_invalidate", canary)
return p, canary
def _close_event_fixture(self):
p = self._queuepool_fixture()
canary = Mock()
event.listen(p, "close", canary)
return p, canary
def _detach_event_fixture(self):
p = self._queuepool_fixture()
canary = Mock()
event.listen(p, "detach", canary)
return p, canary
def _close_detached_event_fixture(self):
p = self._queuepool_fixture()
canary = Mock()
event.listen(p, "close_detached", canary)
return p, canary
def test_close(self):
p, canary = self._close_event_fixture()
c1 = p.connect()
connection = c1.connection
rec = c1._connection_record
c1.close()
eq_(canary.mock_calls, [])
p.dispose()
eq_(canary.mock_calls, [call(connection, rec)])
def test_detach(self):
p, canary = self._detach_event_fixture()
c1 = p.connect()
connection = c1.connection
rec = c1._connection_record
c1.detach()
eq_(canary.mock_calls, [call(connection, rec)])
def test_detach_close(self):
p, canary = self._close_detached_event_fixture()
c1 = p.connect()
connection = c1.connection
c1.detach()
c1.close()
eq_(canary.mock_calls, [call(connection)])
def test_first_connect_event(self):
p, canary = self._first_connect_event_fixture()
p.connect()
eq_(canary, ["first_connect"])
def test_first_connect_event_fires_once(self):
p, canary = self._first_connect_event_fixture()
p.connect()
p.connect()
eq_(canary, ["first_connect"])
def test_first_connect_on_previously_recreated(self):
p, canary = self._first_connect_event_fixture()
p2 = p.recreate()
p.connect()
p2.connect()
eq_(canary, ["first_connect", "first_connect"])
def test_first_connect_on_subsequently_recreated(self):
p, canary = self._first_connect_event_fixture()
p.connect()
p2 = p.recreate()
p2.connect()
eq_(canary, ["first_connect", "first_connect"])
def test_connect_event(self):
p, canary = self._connect_event_fixture()
p.connect()
eq_(canary, ["connect"])
def test_connect_insert_event(self):
p = self._queuepool_fixture()
canary = []
def connect_one(*arg, **kw):
canary.append("connect_one")
def connect_two(*arg, **kw):
canary.append("connect_two")
def connect_three(*arg, **kw):
canary.append("connect_three")
event.listen(p, "connect", connect_one)
event.listen(p, "connect", connect_two, insert=True)
event.listen(p, "connect", connect_three)
p.connect()
eq_(canary, ["connect_two", "connect_one", "connect_three"])
def test_connect_event_fires_subsequent(self):
p, canary = self._connect_event_fixture()
c1 = p.connect() # noqa
c2 = p.connect() # noqa
eq_(canary, ["connect", "connect"])
def test_connect_on_previously_recreated(self):
p, canary = self._connect_event_fixture()
p2 = p.recreate()
p.connect()
p2.connect()
eq_(canary, ["connect", "connect"])
def test_connect_on_subsequently_recreated(self):
p, canary = self._connect_event_fixture()
p.connect()
p2 = p.recreate()
p2.connect()
eq_(canary, ["connect", "connect"])
def test_checkout_event(self):
p, canary = self._checkout_event_fixture()
p.connect()
eq_(canary, ["checkout"])
def test_checkout_event_fires_subsequent(self):
p, canary = self._checkout_event_fixture()
p.connect()
p.connect()
eq_(canary, ["checkout", "checkout"])
def test_checkout_event_on_subsequently_recreated(self):
p, canary = self._checkout_event_fixture()
p.connect()
p2 = p.recreate()
p2.connect()
eq_(canary, ["checkout", "checkout"])
def test_checkin_event(self):
p, canary = self._checkin_event_fixture()
c1 = p.connect()
eq_(canary, [])
c1.close()
eq_(canary, ["checkin"])
def test_reset_event(self):
p, canary = self._reset_event_fixture()
c1 = p.connect()
eq_(canary, [])
c1.close()
eq_(canary, ["reset"])
def test_soft_invalidate_event_no_exception(self):
p, canary = self._soft_invalidate_event_fixture()
c1 = p.connect()
c1.close()
assert not canary.called
c1 = p.connect()
dbapi_con = c1.connection
c1.invalidate(soft=True)
assert canary.call_args_list[0][0][0] is dbapi_con
assert canary.call_args_list[0][0][2] is None
def test_soft_invalidate_event_exception(self):
p, canary = self._soft_invalidate_event_fixture()
c1 = p.connect()
c1.close()
assert not canary.called
c1 = p.connect()
dbapi_con = c1.connection
exc = Exception("hi")
c1.invalidate(exc, soft=True)
assert canary.call_args_list[0][0][0] is dbapi_con
assert canary.call_args_list[0][0][2] is exc
def test_invalidate_event_no_exception(self):
p, canary = self._invalidate_event_fixture()
c1 = p.connect()
c1.close()
assert not canary.called
c1 = p.connect()
dbapi_con = c1.connection
c1.invalidate()
assert canary.call_args_list[0][0][0] is dbapi_con
assert canary.call_args_list[0][0][2] is None
def test_invalidate_event_exception(self):
p, canary = self._invalidate_event_fixture()
c1 = p.connect()
c1.close()
assert not canary.called
c1 = p.connect()
dbapi_con = c1.connection
exc = Exception("hi")
c1.invalidate(exc)
assert canary.call_args_list[0][0][0] is dbapi_con
assert canary.call_args_list[0][0][2] is exc
@testing.combinations((True, testing.requires.python3), (False,))
def test_checkin_event_gc(self, detach_gced):
p, canary = self._checkin_event_fixture(_is_asyncio=detach_gced)
c1 = p.connect()
dbapi_connection = weakref.ref(c1.connection)
eq_(canary, [])
del c1
lazy_gc()
if detach_gced:
# "close_detached" is not called because for asyncio the
# connection is just lost.
eq_(canary, ["detach"])
else:
eq_(canary, ["checkin"])
gc_collect()
if detach_gced:
is_none(dbapi_connection())
else:
is_not_none(dbapi_connection())
def test_checkin_event_on_subsequently_recreated(self):
p, canary = self._checkin_event_fixture()
c1 = p.connect()
p2 = p.recreate()
c2 = p2.connect()
eq_(canary, [])
c1.close()
eq_(canary, ["checkin"])
c2.close()
eq_(canary, ["checkin", "checkin"])
def test_listen_targets_scope(self):
canary = []
def listen_one(*args):
canary.append("listen_one")
def listen_two(*args):
canary.append("listen_two")
def listen_three(*args):
canary.append("listen_three")
def listen_four(*args):
canary.append("listen_four")
engine = testing_engine(testing.db.url)
event.listen(pool.Pool, "connect", listen_one)
event.listen(engine.pool, "connect", listen_two)
event.listen(engine, "connect", listen_three)
event.listen(engine.__class__, "connect", listen_four)
engine.execute(select(1)).close()
eq_(
canary, ["listen_one", "listen_four", "listen_two", "listen_three"]
)
def test_listen_targets_per_subclass(self):
"""test that listen() called on a subclass remains specific to
that subclass."""
canary = []
def listen_one(*args):
canary.append("listen_one")
def listen_two(*args):
canary.append("listen_two")
def listen_three(*args):
canary.append("listen_three")
event.listen(pool.Pool, "connect", listen_one)
event.listen(pool.QueuePool, "connect", listen_two)
event.listen(pool.SingletonThreadPool, "connect", listen_three)
p1 = pool.QueuePool(creator=MockDBAPI().connect)
p2 = pool.SingletonThreadPool(creator=MockDBAPI().connect)
assert listen_one in p1.dispatch.connect
assert listen_two in p1.dispatch.connect
assert listen_three not in p1.dispatch.connect
assert listen_one in p2.dispatch.connect
assert listen_two not in p2.dispatch.connect
assert listen_three in p2.dispatch.connect
p1.connect()
eq_(canary, ["listen_one", "listen_two"])
p2.connect()
eq_(canary, ["listen_one", "listen_two", "listen_one", "listen_three"])
def test_connect_event_fails_invalidates(self):
fail = False
def listen_one(conn, rec):
if fail:
raise Exception("it failed")
def listen_two(conn, rec):
rec.info["important_flag"] = True
p1 = pool.QueuePool(
creator=MockDBAPI().connect, pool_size=1, max_overflow=0
)
event.listen(p1, "connect", listen_one)
event.listen(p1, "connect", listen_two)
conn = p1.connect()
eq_(conn.info["important_flag"], True)
conn.invalidate()
conn.close()
fail = True
assert_raises(Exception, p1.connect)
fail = False
conn = p1.connect()
eq_(conn.info["important_flag"], True)
conn.close()
def teardown_test(self):
# TODO: need to get remove() functionality
# going
pool.Pool.dispatch._clear()
class PoolFirstConnectSyncTest(PoolTestBase):
# test [ticket:2964]
@testing.requires.timing_intensive
def test_sync(self):
pool = self._queuepool_fixture(pool_size=3, max_overflow=0)
evt = Mock()
@event.listens_for(pool, "first_connect")
def slow_first_connect(dbapi_con, rec):
time.sleep(1)
evt.first_connect()
@event.listens_for(pool, "connect")
def on_connect(dbapi_con, rec):
evt.connect()
def checkout():
for j in range(2):
c1 = pool.connect()
time.sleep(0.02)
c1.close()
time.sleep(0.02)
threads = []
# what we're trying to do here is have concurrent use of
# all three pooled connections at once, and the thing we want
# to test is that first_connect() finishes completely before
# any of the connections get returned. so first_connect()
# sleeps for one second, then pings the mock. the threads should
# not have made it to the "checkout() event for that one second.
for i in range(5):
th = threading.Thread(target=checkout)
th.start()
threads.append(th)
for th in threads:
th.join(join_timeout)
# there is a very unlikely condition observed in CI on windows
# where even though we have five threads above all calling upon the
# pool, we didn't get concurrent use of all three connections, two
# connections were enough. so here we purposely just check out
# all three at once just to get a consistent test result.
make_sure_all_three_are_connected = [pool.connect() for i in range(3)]
for conn in make_sure_all_three_are_connected:
conn.close()
eq_(
evt.mock_calls,
[
call.first_connect(),
call.connect(),
call.connect(),
call.connect(),
],
)
class QueuePoolTest(PoolTestBase):
def test_queuepool_del(self):
self._do_testqueuepool(useclose=False)
def test_queuepool_close(self):
self._do_testqueuepool(useclose=True)
def _do_testqueuepool(self, useclose=False):
p = self._queuepool_fixture(pool_size=3, max_overflow=-1)
def status(pool):
return (
pool.size(),
pool.checkedin(),
pool.overflow(),
pool.checkedout(),
)
c1 = p.connect()
self.assert_(status(p) == (3, 0, -2, 1))
c2 = p.connect()
self.assert_(status(p) == (3, 0, -1, 2))
c3 = p.connect()
self.assert_(status(p) == (3, 0, 0, 3))
c4 = p.connect()
self.assert_(status(p) == (3, 0, 1, 4))
c5 = p.connect()
self.assert_(status(p) == (3, 0, 2, 5))
c6 = p.connect()
self.assert_(status(p) == (3, 0, 3, 6))
if useclose:
c4.close()
c3.close()
c2.close()
else:
c4 = c3 = c2 = None
lazy_gc()
eq_(status(p), (3, 3, 3, 3))
if useclose:
c1.close()
c5.close()
c6.close()
else:
c1 = c5 = c6 = None
lazy_gc()
self.assert_(status(p) == (3, 3, 0, 0))
c1 = p.connect()
c2 = p.connect()
self.assert_(status(p) == (3, 1, 0, 2), status(p))
if useclose:
c2.close()
else:
c2 = None
lazy_gc()
self.assert_(status(p) == (3, 2, 0, 1))
c1.close()
def test_timeout_accessor(self):
expected_timeout = 123
p = self._queuepool_fixture(timeout=expected_timeout)
eq_(p.timeout(), expected_timeout)
@testing.requires.timing_intensive
def test_timeout(self):
p = self._queuepool_fixture(pool_size=3, max_overflow=0, timeout=2)
c1 = p.connect() # noqa
c2 = p.connect() # noqa
c3 = p.connect() # noqa
now = time.time()
assert_raises(tsa.exc.TimeoutError, p.connect)
assert int(time.time() - now) == 2
@testing.requires.timing_intensive
def test_timeout_subsecond_precision(self):
p = self._queuepool_fixture(pool_size=1, max_overflow=0, timeout=0.5)
c1 = p.connect() # noqa
with expect_raises(tsa.exc.TimeoutError):
now = time.time()
c2 = p.connect() # noqa
# Python timing is not very accurate, the time diff should be very
# close to 0.5s but we give 200ms of slack.
assert 0.3 <= time.time() - now <= 0.7, "Pool timeout not respected"
@testing.requires.threading_with_mock
@testing.requires.timing_intensive
def test_timeout_race(self):
# test a race condition where the initial connecting threads all race
# to queue.Empty, then block on the mutex. each thread consumes a
# connection as they go in. when the limit is reached, the remaining
# threads go in, and get TimeoutError; even though they never got to
# wait for the timeout on queue.get(). the fix involves checking the
# timeout again within the mutex, and if so, unlocking and throwing
# them back to the start of do_get()
dbapi = MockDBAPI()
p = pool.QueuePool(
creator=lambda: dbapi.connect(delay=0.05),
pool_size=2,
max_overflow=1,
timeout=3,
)
timeouts = []
def checkout():
for x in range(1):
now = time.time()
try:
c1 = p.connect()
except tsa.exc.TimeoutError:
timeouts.append(time.time() - now)
continue
time.sleep(4)
c1.close()
threads = []
for i in range(10):
th = threading.Thread(target=checkout)
th.start()
threads.append(th)
for th in threads:
th.join(join_timeout)
assert len(timeouts) > 0
for t in timeouts:
assert t >= 3, "Not all timeouts were >= 3 seconds %r" % timeouts
# normally, the timeout should under 4 seconds,
# but on a loaded down buildbot it can go up.
assert t < 14, "Not all timeouts were < 14 seconds %r" % timeouts
def _test_overflow(self, thread_count, max_overflow):
reaper = testing.engines.ConnectionKiller()
dbapi = MockDBAPI()
mutex = threading.Lock()
def creator():
time.sleep(0.05)
with mutex:
return dbapi.connect()
p = pool.QueuePool(
creator=creator, pool_size=3, timeout=2, max_overflow=max_overflow
)
reaper.add_pool(p)
peaks = []
def whammy():
for i in range(10):
try:
con = p.connect()
time.sleep(0.005)
peaks.append(p.overflow())
con.close()
del con
except tsa.exc.TimeoutError:
pass
threads = []
for i in range(thread_count):