def __init__(self, connection_handler, queue, on_message_callback):
"""
Instantiate a Worker with an opened connection and a queue name to work
The channel is opened in the instantiation of the module for ready use.
It will be closed after consuming the message on the given queue.
:param ConnectionHandler connection_handler : The connection to use
between the worker and RabbitMQ.
:param str queue : The name of the queue which to consume message
:param callback on_message_callback: the callback to call when message
is received from RabbitMQ
"""
self._connection = connection_handler.get_current_connection()
self._queue = queue
self._worker_channel = WorkerChannel(self._connection, self._queue,
on_message_callback)
self.logger = logging.getLogger('RabbitMQ-Worker')
class TestWorkerChannel:
def setup(self):
connection = Mock(Connection)
connection.is_closed = False
self.worker = WorkerChannel(connection, None, None)
self.worker.open()
def teardown_method(self):
self.worker.close()
def test_raise_error_on_keyboard_interrupt(self):
# Given
self.worker._channel.start_consuming.side_effect = KeyboardInterrupt()
# When
with pytest.raises(WorkerExitException) as error:
self.worker.run()
# Then
assert 'Worker stopped pulling message' == error.value.args[0]
def test_raise_when_error_occurs_in_decode_message_content(self):
empty_body_as_bytes = b'{}'
self.worker.event_handler = Mock()
# When
self.worker.on_message(None, Basic.GetOk(), None, empty_body_as_bytes)
# Then
assert not self.worker.event_handler.execute_rabbit.called
def test_execute_rabbit_is_not_called_when_exception_raised(self):
empty_body_as_bytes = b'{}'
self.worker.event_handler = Mock()
# When
self.worker.on_message(None, Basic.GetOk(), None, empty_body_as_bytes)
# Then
assert not self.worker.event_handler.execute_rabbit.called
class Worker:
"""This is a Worker that will handle a connection and queue to work
on the available messages in RabbitMQ server.
The worker will setup the channel to use and when finished, it will also
close the current channel.
"""
def __init__(self, connection_handler, queue, on_message_callback):
"""
Instantiate a Worker with an opened connection and a queue name to work
The channel is opened in the instantiation of the module for ready use.
It will be closed after consuming the message on the given queue.
:param ConnectionHandler connection_handler : The connection to use
between the worker and RabbitMQ.
:param str queue : The name of the queue which to consume message
:param callback on_message_callback: the callback to call when message
is received from RabbitMQ
"""
self._connection = connection_handler.get_current_connection()
self._queue = queue
self._worker_channel = WorkerChannel(self._connection, self._queue,
on_message_callback)
self.logger = logging.getLogger('RabbitMQ-Worker')
def consume_message(self):
self.logger.info('Consuming message on queue %s' % self._queue)
self._worker_channel.run()
def consume_one_message(self):
try:
self.logger.info('Consuming one message on queue %s' % self._queue)
self._worker_channel.open()
ret = self._worker_channel.consume_one_message()
finally:
self._worker_channel.close()
return ret
def setup(self):
connection = Mock(Connection)
connection.is_closed = False
self.worker = WorkerChannel(connection, None, None)
self.worker.open()