def _get_connection(self, index=None):
if index is None:
index = self._get_random_index()
if not 0 <= index < self._ring_size:
raise ValueError(
'There are only {count} hosts, but you asked for connection {index}.'
.format(
count=self._ring_size,
index=index,
))
for i in range(self._sentinel_failover_retries + 1):
try:
return self._get_master_client_for(self._services[index])
except redis.sentinel.MasterNotFoundError:
self.reset_clients(
) # make sure we reach out to get master info again on next call
if i == self._sentinel_failover_retries:
raise CannotGetConnectionError(
'Master not found; gave up reloading master info after failover.'
)
self._get_counter(
'backend.sentinel.master_not_found_retry').increment()
time.sleep((2**i + random.random()) / 4.0)
def test_cannot_get_connection_error_on_receive(self, mock_standard, mock_sentinel):
core = RedisTransportCore(backend_type=REDIS_BACKEND_TYPE_STANDARD)
mock_standard.return_value.get_connection.side_effect = CannotGetConnectionError('This is another error')
with self.assertRaises(MessageReceiveError) as error_context:
core.receive_message('your_queue')
self.assertEquals('Cannot get connection: This is another error', error_context.exception.args[0])
self.assertFalse(mock_sentinel.called)
mock_standard.return_value.get_connection.assert_called_once_with('pysoa:your_queue')
def _get_connection(self, index): # type: (int) -> redis.StrictRedis
if not 0 <= index < self._ring_size:
raise ValueError(
'There are only {count} hosts, but you asked for connection {index}.'.format(
count=self._ring_size,
index=index,
)
)
for i in range(self._sentinel_failover_retries + 1):
try:
return self._get_master_client_for(self._services[index])
except redis.sentinel.MasterNotFoundError:
self.reset_clients() # make sure we reach out to get master info again on next call
_logger.warning('Redis master not found, so resetting clients (failover?)')
if i != self._sentinel_failover_retries:
self._get_counter('backend.sentinel.master_not_found_retry').increment()
time.sleep((2 ** i + random.random()) / 4.0)
raise CannotGetConnectionError('Master not found; gave up reloading master info after failover.')