Source code for airflow.example_dags.example_passing_params_via_test_command

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"""Example DAG demonstrating the usage of the params arguments in templated arguments."""
from __future__ import annotations

import datetime
import os
from textwrap import dedent

import pendulum

from airflow import DAG
from airflow.decorators import task
from airflow.operators.bash import BashOperator

[docs]def my_py_command(params, test_mode=None, task=None): """ Print out the "foo" param passed in via `airflow tasks test example_passing_params_via_test_command run_this <date> -t '{"foo":"bar"}'` """ if test_mode: print( f" 'foo' was passed in via test={test_mode} command : kwargs[params][foo] = {task.params['foo']}" ) # Print out the value of "miff", passed in below via the Python Operator print(f" 'miff' was passed in via task params = {params['miff']}") return 1
@task(task_id="env_var_test_task") with DAG( "example_passing_params_via_test_command", schedule='*/1 * * * *', start_date=pendulum.datetime(2021, 1, 1, tz="UTC"), catchup=False, dagrun_timeout=datetime.timedelta(minutes=4), tags=['example'], ) as dag:
[docs] run_this = my_py_command(params={"miff": "agg"})
my_command = dedent( """ echo "'foo' was passed in via Airflow CLI Test command with value '$FOO'" echo "'miff' was passed in via BashOperator with value '$MIFF'" """ ) also_run_this = BashOperator( task_id='also_run_this', bash_command=my_command, params={"miff": "agg"}, env={"FOO": "{{ }}", "MIFF": "{{ params.miff }}"}, ) env_var_test_task = print_env_vars() run_this >> also_run_this

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