从未知任务中检索Celery中'task_id'的结果

如果我以前不知道执行了哪个任务,如何提取任务的结果？这是设置:给定以下源('tasks.py'):

from celery import Celery

app = Celery('tasks', backend="db+mysql://u:p@localhost/db", broker = 'amqp://guest:guest@localhost:5672//')

@app.task
def add(x,y):
   return x + y


@app.task
def mul(x,y):
   return x * y

RabbitMQ 3.3.2在本地运行:

marcs-mbp:sbin marcstreeter$ ./rabbitmq-server

              RabbitMQ 3.3.2. Copyright (C) 2007-2014 GoPivotal, Inc.
  ##  ##      Licensed under the MPL.  See http://www.rabbitmq.com/
  ##  ##
  ##########  Logs: /usr/local/var/log/rabbitmq/rabbit@localhost.log
  ######  ##        /usr/local/var/log/rabbitmq/rabbit@localhost-sasl.log
  ##########
              Starting broker... completed with 10 plugins.

与Celery 3.1.12在本地运行:

 -------------- celery@Marcs-MacBook-Pro.local v3.1.12 (Cipater)
---- **** -----
--- * ***  * -- Darwin-13.2.0-x86_64-i386-64bit
-- * - **** ---
- ** ---------- [config]
- ** ---------- .> app:         tasks:0x105dea3d0
- ** ---------- .> transport:   amqp://guest:**@localhost:5672//
- ** ---------- .> results:     disabled
- *** --- * --- .> concurrency: 8 (prefork)
-- ******* ----
--- ***** ----- [queues]
 -------------- .> celery           exchange=celery(direct) key=celery

然后我可以导入方法并使用'task_id'检索结果:

from tasks import add, mul
from celery.result import AsyncResult

result = add.delay(2,2)
task_id = result.task_id
result.get() # 4

result = AsyncResult(id=task_id)
result.get() # 4

result = add.AsyncResult(id=task_id)
result.get() # 4

# and the same for the 'mul' task. Just imagine I put it here

在下一个示例中,我将在流程之间拆分这些步骤.在一个过程中,我像这样检索'task_id':

from tasks import add

result = add.delay(5,5)
task_id = result.task_id

在另一个过程中,如果我使用相同的'task_id'(复制并粘贴到另一个REPL,或在不同的HTTP请求中),如下所示:

from celery.result import AsyncResult

result = AsyncResult(id="copied_task_id", backend="db+mysql://u:p@localhost/db")
result.get() # AttributeError: 'str' object has no attribute 'get_task_meta'
result.state # AttributeError: 'str' object has no attribute 'get_task_meta'
result.status # AttributeError: 'str' object has no attribute 'get_task_meta'

如果我这样做,在另一个过程中:

from task import add # in this instance I know that an add task was performed

result = add.AsyncResult(id="copied_task_id")
result.status # "SUCCESSFUL"
result.state # "SUCCESSFUL"
result.get() # 10

我希望能够在不知道什么任务产生结果的情况下获得结果.在我的真实环境中,我计划将此task_id返回给客户端,让他们通过HTTP请求查询其作业的状态.