def _open_connection(self):
"""Retries connecting to the AMQP broker over time.
See :func:`celery.utils.retry_over_time`.
"""
def _connection_error_handler(exc, interval):
"""Callback handler for connection errors."""
self.logger.error("AMQP Listener: Connection Error: %s. " % exc
+ "Trying again in %d seconds..." % interval)
def _establish_connection():
"""Establish a connection to the AMQP broker."""
conn = DjangoBrokerConnection()
connected = conn.connection # Connection is established lazily.
return conn
if not conf.AMQP_CONNECTION_RETRY:
return _establish_connection()
conn = retry_over_time(_establish_connection, (socket.error, IOError),
errback=_connection_error_handler,
max_retries=conf.AMQP_CONNECTION_MAX_RETRIES)
self.logger.debug("CarrotListener: Connection Established.")
return conn
def test_returns_retval_on_success(self):
def _fun(x, y):
return x * y
ret = utils.retry_over_time(_fun, (socket.error, ), args=[16, 16],
max_retries=3)
self.assertEqual(ret, 256)
def test_returns_retval_on_success(self):
def _fun(x, y):
return x * y
ret = utils.retry_over_time(_fun, (socket.error, ),
args=[16, 16],
max_retries=3)
self.assertEqual(ret, 256)
def test_retries_on_failure(self):
iterations = [0]
def _fun(x, y):
iterations[0] += 1
if iterations[0] == 3:
return x * y
raise socket.error("foozbaz")
ret = utils.retry_over_time(_fun, (socket.error, ), args=[32, 32],
max_retries=None)
self.assertEqual(iterations[0], 3)
self.assertEqual(ret, 1024)
self.assertRaises(socket.error, utils.retry_over_time,
_fun, (socket.error, ), args=[32, 32], max_retries=1)
def test_retries_on_failure(self):
iterations = [0]
def _fun(x, y):
iterations[0] += 1
if iterations[0] == 3:
return x * y
raise socket.error("foozbaz")
ret = utils.retry_over_time(_fun, (socket.error, ),
args=[32, 32],
max_retries=None)
self.assertEqual(iterations[0], 3)
self.assertEqual(ret, 1024)
self.assertRaises(socket.error,
utils.retry_over_time,
_fun, (socket.error, ),
args=[32, 32],
max_retries=1)
