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import testbase
from testbase import PersistTest
import unittest, sys, os, time
import sqlalchemy.pool as pool
import sqlalchemy.exceptions as exceptions
mcid = 1
class MockDBAPI(object):
def __init__(self):
self.throw_error = False
def connect(self, argument):
if self.throw_error:
raise Exception("couldnt connect !")
return MockConnection()
class MockConnection(object):
def __init__(self):
global mcid
self.id = mcid
mcid += 1
def close(self):
pass
def rollback(self):
pass
def cursor(self):
return MockCursor()
class MockCursor(object):
def close(self):
pass
mock_dbapi = MockDBAPI()
class PoolTest(PersistTest):
def setUp(self):
pool.clear_managers()
def testmanager(self):
manager = pool.manage(mock_dbapi, use_threadlocal=True)
connection = manager.connect('foo.db')
connection2 = manager.connect('foo.db')
connection3 = manager.connect('bar.db')
self.echo( "connection " + repr(connection))
self.assert_(connection.cursor() is not None)
self.assert_(connection is connection2)
self.assert_(connection2 is not connection3)
def testbadargs(self):
manager = pool.manage(mock_dbapi)
try:
connection = manager.connect(None)
except:
pass
def testnonthreadlocalmanager(self):
manager = pool.manage(mock_dbapi, use_threadlocal = False)
connection = manager.connect('foo.db')
connection2 = manager.connect('foo.db')
self.echo( "connection " + repr(connection))
self.assert_(connection.cursor() is not None)
self.assert_(connection is not connection2)
def testqueuepool_del(self):
self._do_testqueuepool(useclose=False)
def testqueuepool_close(self):
self._do_testqueuepool(useclose=True)
def _do_testqueuepool(self, useclose=False):
p = pool.QueuePool(creator = lambda: mock_dbapi.connect('foo.db'), pool_size = 3, max_overflow = -1, use_threadlocal = False)
def status(pool):
tup = (pool.size(), pool.checkedin(), pool.overflow(), pool.checkedout())
self.echo( "Pool size: %d Connections in pool: %d Current Overflow: %d Current Checked out connections: %d" % tup)
return tup
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
self.assert_(status(p) == (3,3,3,3))
if useclose:
c1.close()
c5.close()
c6.close()
else:
c1 = c5 = c6 = None
self.assert_(status(p) == (3,3,0,0))
c1 = p.connect()
c2 = p.connect()
self.assert_(status(p) == (3, 1, 0, 2))
if useclose:
c2.close()
else:
c2 = None
self.assert_(status(p) == (3, 2, 0, 1))
def test_timeout(self):
p = pool.QueuePool(creator = lambda: mock_dbapi.connect('foo.db'), pool_size = 3, max_overflow = 0, use_threadlocal = False, timeout=2)
c1 = p.get()
c2 = p.get()
c3 = p.get()
now = time.time()
try:
c4 = p.get()
assert False
except exceptions.TimeoutError, e:
assert int(time.time() - now) == 2
def test_mixed_close(self):
p = pool.QueuePool(creator = lambda: mock_dbapi.connect('foo.db'), pool_size = 3, max_overflow = -1, use_threadlocal = True)
c1 = p.connect()
c2 = p.connect()
assert c1 is c2
c1.close()
c2 = None
assert p.checkedout() == 1
c1 = None
assert p.checkedout() == 0
def test_trick_the_counter(self):
"""this is a "flaw" in the connection pool; since threadlocal uses a single ConnectionFairy per thread
with an open/close counter, you can fool the counter into giving you a ConnectionFairy with an
ambiguous counter. i.e. its not true reference counting."""
p = pool.QueuePool(creator = lambda: mock_dbapi.connect('foo.db'), pool_size = 3, max_overflow = -1, use_threadlocal = True)
c1 = p.connect()
c2 = p.connect()
assert c1 is c2
c1.close()
c2 = p.connect()
c2.close()
self.assert_(p.checkedout() != 0)
c2.close()
self.assert_(p.checkedout() == 0)
def test_recycle(self):
p = pool.QueuePool(creator = lambda: mock_dbapi.connect('foo.db'), pool_size = 1, max_overflow = 0, use_threadlocal = False, recycle=3)
c1 = p.connect()
c_id = id(c1.connection)
c1.close()
c2 = p.connect()
assert id(c2.connection) == c_id
c2.close()
time.sleep(4)
c3= p.connect()
assert id(c3.connection) != c_id
def test_invalidate(self):
dbapi = MockDBAPI()
p = pool.QueuePool(creator = lambda: dbapi.connect('foo.db'), pool_size = 1, max_overflow = 0, use_threadlocal = False)
c1 = p.connect()
c_id = c1.connection.id
c1.close(); c1=None
c1 = p.connect()
assert c1.connection.id == c_id
c1.invalidate()
c1 = None
c1 = p.connect()
assert c1.connection.id != c_id
def test_recreate(self):
dbapi = MockDBAPI()
p = pool.QueuePool(creator = lambda: dbapi.connect('foo.db'), pool_size = 1, max_overflow = 0, use_threadlocal = False)
p2 = p.recreate()
assert p2.size() == 1
assert p2._use_threadlocal is False
assert p2._max_overflow == 0
def test_reconnect(self):
"""tests reconnect operations at the pool level. SA's engine/dialect includes another
layer of reconnect support for 'database was lost' errors."""
dbapi = MockDBAPI()
p = pool.QueuePool(creator = lambda: dbapi.connect('foo.db'), pool_size = 1, max_overflow = 0, use_threadlocal = False)
c1 = p.connect()
c_id = c1.connection.id
c1.close(); c1=None
c1 = p.connect()
assert c1.connection.id == c_id
dbapi.raise_error = True
c1.invalidate()
c1 = None
c1 = p.connect()
assert c1.connection.id != c_id
def testthreadlocal_del(self):
self._do_testthreadlocal(useclose=False)
def testthreadlocal_close(self):
self._do_testthreadlocal(useclose=True)
def _do_testthreadlocal(self, useclose=False):
for p in (
pool.QueuePool(creator = lambda: mock_dbapi.connect('foo.db'), pool_size = 3, max_overflow = -1, use_threadlocal = True),
pool.SingletonThreadPool(creator = lambda: mock_dbapi.connect('foo.db'), use_threadlocal = True)
):
c1 = p.connect()
c2 = p.connect()
self.assert_(c1 is c2)
c3 = p.unique_connection()
self.assert_(c3 is not c1)
if useclose:
c2.close()
else:
c2 = None
c2 = p.connect()
self.assert_(c1 is c2)
self.assert_(c3 is not c1)
if useclose:
c2.close()
else:
c2 = None
if useclose:
c1 = p.connect()
c2 = p.connect()
c3 = p.connect()
c3.close()
c2.close()
self.assert_(c1.connection is not None)
c1.close()
c1 = c2 = c3 = None
# extra tests with QueuePool to insure connections get __del__()ed when dereferenced
if isinstance(p, pool.QueuePool):
self.assert_(p.checkedout() == 0)
c1 = p.connect()
c2 = p.connect()
if useclose:
c2.close()
c1.close()
else:
c2 = None
c1 = None
self.assert_(p.checkedout() == 0)
def tearDown(self):
pool.clear_managers()
if __name__ == "__main__":
testbase.main()
|
