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# -*- 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.operators.bash_operator import BashOperator | |
from airflow.operators.python_operator import PythonOperator | |
from airflow.models import DAG | |
from datetime import datetime, timedelta | |
import copy | |
from airflow.operators.subdag_operator import SubDagOperator | |
from airflow.models import DagRun | |
from airflow.utils.db import create_session | |
class ExtendedBashOperator(BashOperator): | |
template_fields = () | |
on_pre_execute_template_fields = BashOperator.template_fields | |
def pre_execute(self, context): | |
if hasattr(self, 'dag'): | |
if self.dag.user_defined_macros: | |
context.update( | |
self.dag.user_defined_macros) | |
if self.dag.is_subdag and self.params.get('parent_dag_id'): | |
with create_session() as session: | |
parent_dag_run = ( | |
session.query(DagRun) | |
.filter_by( | |
dag_id=self.params['parent_dag_id'], | |
execution_date=context['execution_date']) | |
.first() | |
) | |
context['parent_dag_run'] = parent_dag_run | |
rt = self.render_template # shortcut to method | |
for attr in self.__class__.on_pre_execute_template_fields: | |
content = getattr(self, attr) | |
if content: | |
rendered_content = rt(attr, content, context) | |
setattr(self, attr, rendered_content) | |
super(ExtendedBashOperator, self).pre_execute(context) | |
def create_subdag(parent_dag, subdag_task_id): | |
default_args = { | |
'owner': 'airflow', | |
'depends_on_past': False, | |
'start_date': datetime(2017, 7, 28), | |
'retries': 0, | |
'retry_delay': timedelta(minutes=5) | |
} | |
sub_dag = DAG('{}.{}'.format(parent_dag, subdag_task_id), default_args=default_args, schedule_interval=None) | |
bash_task = ExtendedBashOperator( | |
task_id="bash_task", | |
bash_command='echo "Here is the message: {{ parent_dag_run.conf["message"] if parent_dag_run else "" }}" ', | |
params = { | |
'parent_dag_id': parent_dag | |
}, | |
dag=sub_dag) | |
return sub_dag | |
args = { | |
'start_date': datetime.utcnow(), | |
'owner': 'airflow', | |
} | |
dag = DAG( | |
dag_id='trigger_subdag', | |
default_args=args, | |
schedule_interval=None) | |
def run_this_func(ds, **kwargs): | |
print("Remotely received value of {} for key=message".format(kwargs['dag_run'].conf['message'])) | |
print("this is ds: {}".format(str(ds))) | |
return ds | |
run_this = PythonOperator( | |
task_id='run_this', | |
provide_context=True, | |
python_callable=run_this_func, | |
dag=dag) | |
# You can also access the DagRun object in templates | |
bash_task = BashOperator( | |
task_id="bash_task", | |
bash_command='echo "Here is the message: {{ dag_run.conf["message"] if dag_run else "" }}" ', | |
dag=dag) | |
subdag_operator = SubDagOperator( | |
task_id="subdag", | |
subdag=create_subdag(dag.dag_id, "subdag"), | |
dag=dag | |
) |
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# -*- 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.operators.bash_operator import BashOperator | |
from airflow.operators.python_operator import PythonOperator | |
from airflow.models import DAG | |
from datetime import datetime, timedelta | |
import copy | |
from airflow.operators.subdag_operator import SubDagOperator | |
from airflow.models import DagRun | |
from airflow.utils.db import create_session | |
def get_parent_run(parent_dag_id, **kwargs): | |
with create_session() as session: | |
parent_dag_run = ( | |
session.query(DagRun) | |
.filter_by( | |
dag_id=parent_dag_id, | |
execution_date=kwargs['execution_date']) | |
.first() | |
) | |
return parent_dag_run | |
def create_subdag(parent_dag, subdag_task_id): | |
default_args = { | |
'owner': 'airflow', | |
'depends_on_past': False, | |
'start_date': datetime(2017, 7, 28), | |
'retries': 0, | |
'retry_delay': timedelta(minutes=5) | |
} | |
sub_dag = DAG('{}.{}'.format(parent_dag, subdag_task_id), default_args=default_args, schedule_interval=None) | |
get_parent_run_task = PythonOperator( | |
task_id="get_parent_run", | |
python_callable=get_parent_run, | |
provide_context=True, | |
op_kwargs={ | |
'parent_dag_id': parent_dag | |
}, | |
dag=sub_dag | |
) | |
bash_task = BashOperator( | |
task_id="bash_task", | |
bash_command='echo "Here is the message: {{ ti.xcom_pull("get_parent_run").conf["message"] }}" ', | |
dag=sub_dag) | |
get_parent_run_task >> bash_task | |
return sub_dag | |
args = { | |
'start_date': datetime.utcnow(), | |
'owner': 'airflow', | |
} | |
dag = DAG( | |
dag_id='trigger_subdag_new', | |
default_args=args, | |
schedule_interval=None) | |
def run_this_func(ds, **kwargs): | |
print("Remotely received value of {} for key=message".format(kwargs['dag_run'].conf['message'])) | |
print("this is ds: {}".format(str(ds))) | |
return ds | |
run_this = PythonOperator( | |
task_id='run_this', | |
provide_context=True, | |
python_callable=run_this_func, | |
dag=dag) | |
# You can also access the DagRun object in templates | |
bash_task = BashOperator( | |
task_id="bash_task", | |
bash_command='echo "Here is the message: {{ dag_run.conf["message"] if dag_run else "" }}" ', | |
dag=dag) | |
subdag_operator = SubDagOperator( | |
task_id="subdag", | |
subdag=create_subdag(dag.dag_id, "subdag"), | |
dag=dag | |
) |
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