Python Kombu consumer get queue message but the callback can't trigger - kombu

Question

If I run followed code, I found I can get message from the queue, but the callback can't triggered
from kombu.mixins import ConsumerMixin
from kombu import Exchange, Queue
task_exchange = Exchange('nginx', type='direct')
task_queues = [Queue(exchange=task_exchange, routing_key='nginx')]
class Worker(ConsumerMixin):
def __init__(self, connection):
self.connection = connection
def get_consumers(self, Consumer, channel):
return [Consumer(queues=task_queues,
callbacks=[self.task]
)]
def task(self, body, message):
print body
message.ack()
if __name__ == '__main__':
from kombu import Connection
with Connection('amqp://test:test#localhost:5672/test') as conn:
worker = Worker(conn)
worker.run()
I try to run python -m pdb test.py
170 -> def run(self, _tokens=1):
171 restart_limit = self.restart_limit
172 errors = (self.connection.connection_errors +
173 self.connection.channel_errors)
174 while not self.should_stop:
175 try:
(Pdb) l
176 if restart_limit.can_consume(_tokens):
177 for _ in self.consume(limit=None): # pragma: no cover
178 pass
179 else:
180 sleep(restart_limit.expected_time(_tokens))
181 except errors:
182 warn(W_CONN_LOST, exc_info=1)
It loop at
for _ in self.consume(limit=None): # pragma: no cover
pass

Answer 1

Runpython -m pdb test.py, Get in the connection.drain_events(), found the content.body encoding is binary,
if (content and
309 channel.auto_decode and
310 hasattr(content, 'content_encoding')):
311 -> try:
312 content.body = content.body.decode(content.content_encoding) #here get a error
313 except Exception:
314 pass
fix it
def get_consumers(self, Consumer, channel):
return [Consumer(queues=task_queues,
accept=['json', 'pickle'],
callbacks=[self.task]
)]