0

我需要在芹菜和弦中将其他参数传递给我的回调函数。（芹菜版本：4.1.0（潜在调用）和 Python 2.7）

考虑以下示例：

程序.py

from tasks import get_stock_info, call_back
from celery import group, chord

def chord_queue():
    header = (get_stock_info.subtask((delay,)) for delay in [4, 5, 4])
    callback = call_back.subtask()
    header1 = (get_stock_info.subtask((delay,)) for delay in [4, 4, 4])
    res = chord(header,queue='susanoo_dev')(callback)
    res1 = chord(header1,queue='susanoo_core')(callback)
    print(res.get())
    print(res1.get())
    print("We are done")

if __name__ == '__main__':
    chord_queue()

任务.py

from pandas_datareader import data
from celery_app import app
import time

@app.task
def get_stock_info(delay):
    print('hello Celery--------')
    time.sleep(delay)
    print('Whats up')
    return 10

@app.task
def call_back(num):
    print("Everything is done------")
    print("Everything is done------")
    return sum(num)

celery_app.py

from celery import Celery
from kombu import Queue

app = Celery('tasks', broker='amqp://my_user:my_pass@localhost/my_vhost', backend='redis://localhost:6379/0')

CELERY_CONFIG = {
    'CELERY_DEFAULT_QUEUE': 'default',
    'CELERY_QUEUES': (Queue('dev'), Queue('core'),)
}

app.conf.update(**CELERY_CONFIG)

现在在这种情况下，当 chord 被调用并且在所有 3 个get_stock_info任务完成之后，call_back被调用，值10自动传递给它，它是get_stock_info的返回值。现在连同返回值，我还想将一个附加参数说一个字符串作为“abcd”传递给回调函数。

我该怎么做 ？

我已经按照一些博客/SO 答案等的建议尝试过这样做。

程序.py

def chord_queue():
    header = (get_stock_info.subtask((delay,)) for delay in [4, 5, 4])
    callback = call_back.subtask(kwargs={'my_str' : 'abcd'})
    header1 = (get_stock_info.subtask((delay,)) for delay in [4, 4, 4])
    res = chord(header,queue='susanoo_dev' )(callback)
    res1 = chord(header1,queue='susanoo_core')(callback)
    print(res.get())
    print(res1.get())
    print("We are done")

任务.py

@app.task
def call_back(num, my_str):
    print("Everything is done------")
    print("Everything is done------")
    print my_str
    return my_str, sum(num)

但这似乎不起作用并引发以下错误：

celery.backends.base.ChordError: 回调错误: TypeError("call_back() got an unexpected keyword argument 'my_str'",)

4

1 回答 1

2

得到了答案。感谢一位帮助我解决问题的朋友。上述解决方案中做错的只是my_str在call_back().

所以可行的解决方案是：

程序.py

def chord_queue():
    header = (get_stock_info.subtask((delay,)) for delay in [4, 5, 4])
    callback = call_back.subtask(kwargs={'my_str' : 'abcd'})
    header1 = (get_stock_info.subtask((delay,)) for delay in [4, 4, 4])
    res = chord(header,queue='susanoo_dev' )(callback)
    res1 = chord(header1,queue='susanoo_core')(callback)
    print(res.get())
    print(res1.get())
    print("We are done")

任务.py

@app.task
def call_back(num, my_str=None):
    print("Everything is done------")
    print("Everything is done------")
    print my_str
    return my_str, sum(num)

它按预期工作，没有任何问题。

于 2017-12-06T17:13:31.780 回答