如何在SlackAPIPostOperator中获得`ds`？

Question

I want to run a python script which need a datetime param and post its output to slack. But I don't know how to get airflow template variable ds .

Let's say, I have below code:

def make_txt():
    # get ds
    ds = get_ds()
    ds = ds * 3 + 4 / 5   # do something with ds
    return ds

slack_task = SlackAPIPostOperator(
    text=make_txt(),
    token='xoxp-xxxxxxx',
)

Because I will run with airflow backfill dag_id -s 2016-10-01 , the ds (here is 2016-10-01) should pass to slack text.

I try to write python script output to a file and then read it and pass to slack text directly. But I don't think that's a perfect solution.

Answer 1

SlackAPIPostOperator的text字段是模板化的，因此，如果在文本中的某处添加{{ ds }} ，它将由jinja插入。