text: # -*- coding: utf-8 -*-
  #
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  #
  # http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  
  from airflow.models import BaseOperator, DagBag
  from airflow.utils import timezone
  from airflow.utils.db import create_session
  from airflow.utils.decorators import apply_defaults
  from airflow.utils.state import State
  from airflow import settings
  
  
  class DagRunOrder(object):
      def __init__(self, run_id=None, payload=None):
          self.run_id = run_id
          self.payload = payload
  
  
  class TriggerDagRunOperator(BaseOperator):
      """
      Triggers a DAG run for a specified ``dag_id``
  
      :param trigger_dag_id: the dag_id to trigger
      :type trigger_dag_id: str
      :param python_callable: a reference to a python function that will be
          called while passing it the ``context`` object and a placeholder
          object ``obj`` for your callable to fill and return if you want
          a DagRun created. This ``obj`` object contains a ``run_id`` and
          ``payload`` attribute that you can modify in your function.
          The ``run_id`` should be a unique identifier for that DAG run, and
          the payload has to be a picklable object that will be made available
          to your tasks while executing that DAG run. Your function header
          should look like ``def foo(context, dag_run_obj):``
      :type python_callable: python callable
      """
      template_fields = tuple()
      template_ext = tuple()
      ui_color = '#ffefeb'
  
      @apply_defaults
      def __init__(
              self,
              trigger_dag_id,
              python_callable=None,
              *args, **kwargs):
          super(TriggerDagRunOperator, self).__init__(*args, **kwargs)
          self.python_callable = python_callable
          self.trigger_dag_id = trigger_dag_id
  
      def execute(self, context):
          dro = DagRunOrder(run_id='trig__' + timezone.utcnow().isoformat())
          if self.python_callable is not None:
              dro = self.python_callable(context, dro)
          if dro:
              with create_session() as session:
                  dbag = DagBag(settings.DAGS_FOLDER)
                  trigger_dag = dbag.get_dag(self.trigger_dag_id)
                  dr = trigger_dag.create_dagrun(
                      run_id=dro.run_id,
                      state=State.RUNNING,
                      conf=dro.payload,
                      external_trigger=True)
                  self.log.info("Creating DagRun %s", dr)
                  session.add(dr)
                  session.commit()
          else:
              self.log.info("Criteria not met, moving on")
  