通过pdb调试djcelery的celeryd

Question

有没有人尝试过用pdb调试celeryd工作进程？每当遇到断点时（无论是通过pdb运行celeryd，还是通过pdb.set_trace()），我都会遇到以下错误：

Error while handling action event.
Traceback (most recent call last):
  File "/home/jeeyo/workspace3/uwcr/subscriptions/tasks.py", line 79, in process_action_event
    func(action_event)
  File "/home/jeeyo/workspace3/uwcr/subscriptions/tasks.py", line 36, in new_user_email
    send_registration_email(username, new_user.get_profile().plaintext_password)
  File "/home/jeeyo/workspace3/uwcr/looers/email.py", line 18, in send_registration_email
    'Your password from UWCoopRankings', user
  File "/home/jeeyo/workspace3/uwcr/looers/email.py", line 61, in send_email
    if isinstance(to, basestring):
  File "/home/jeeyo/workspace3/uwcr/looers/email.py", line 61, in send_email
    if isinstance(to, basestring):
  File "/usr/lib/python2.6/bdb.py", line 46, in trace_dispatch
    return self.dispatch_line(frame)
  File "/usr/lib/python2.6/bdb.py", line 65, in dispatch_line
    if self.quitting: raise BdbQuit
BdbQuit

有没有什么解决办法？

Answer 1

我也遇到过同样的问题。试试使用Celery的远程调试工具rdb吧：

from celery import task
from celery.contrib import rdb

@task()
def add(x, y):
    result = x + y
    rdb.set_trace()  # <- set break-point
    return result

可以查看一下这个用户指南（链接更新于2017年5月）。