在 Celery 中，如何跟踪当前的重试？我知道我可以做这样的事情：
@app.task(bind=True, default_retry_delay=900, max_retries=5)
def send_email(self, sender=None, to=None, subject=None, message=None):
try:
# Send email
except Exception as e:
# Print log message with current retry
self.retry(e)
但我想说这是尝试 1/5..2/5 等等。
当前重试次数可以在request.retries您的任务的属性。
@app.task(retries=3, default_retry_delay=1)
def fail():
try:
assert False
except Exception as e:
print 'Try {0}/{1}'.format(fail.request.retries, fail.max_retries)
# Print log message with current retry
raise fail.retry(exc=e)
[2015-01-14 15:15:55,702: WARNING/Worker-1] Try 0/3
[2015-01-14 15:15:58,604: WARNING/Worker-3] Try 1/3
[2015-01-14 15:16:00,605: WARNING/Worker-2] Try 2/3
[2015-01-14 15:16:02,607: WARNING/Worker-6] Try 3/3
Celery 内部使用了类似的方法：https://github.com/celery/celery/blob/b0cfa0d818743262a032c541cce2fa8c43fabad4/celery/app/task.py#L558 https://github.com/celery/celery/blob/b0cfa0d818743262a032c541cce2fa8c43fabad4/celery/app/task.py#L558
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