trigger.py

from airflow import DAG
from airflow.operators import PythonOperator, TriggerDagRunOperator
from datetime import datetime, timedelta
import sys
sys.path.append('/home/pablo/workspace/scratch/')
from default_test import default_test

default_args = {
  'owner': 'airflow',
  'depends_on_past': False,
  'start_date': datetime.now() - timedelta(minutes=15),
  'email': ['airflow@airflow.com'],
  'email_on_failure': False,
  'email_on_retry': False,
  'retries': 0,
  # 'queue': 'bash_queue',
  # 'pool': 'backfill',
  # 'priority_weight': 10,
  # 'end_date': datetime(2016, 1, 1),
}


def trigger(context, dag_run_obj):
  if context['params']['condition_param']:
    return dag_run_obj

dag = DAG('dag_with_trigger', default_args=default_args, schedule_interval=timedelta(minutes=15))

first = PythonOperator(
  task_id='first',
  python_callable=default_test,
  dag=dag)

trigger = TriggerDagRunOperator(task_id='trigger',
                                trigger_dag_id="target_dag",
                                python_callable=trigger,
                                params={'condition_param': True,
                                        'message': 'Running'},
                                trigger_rule='all_success',
                                dag=dag)

trigger.set_upstream(first)