244 lines
9.2 KiB
Python
244 lines
9.2 KiB
Python
# Copyright 2018 AT&T Intellectual Property. All other rights reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from airflow.operators import ConcurrencyCheckOperator
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from airflow.operators.bash_operator import BashOperator
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from airflow.operators.python_operator import BranchPythonOperator
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from airflow.operators.python_operator import PythonOperator
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from airflow.operators.subdag_operator import SubDagOperator
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from armada_deploy_site import deploy_site_armada
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import dag_names as dn
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from deckhand_get_design import get_design_deckhand
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from destroy_node import destroy_server
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from drydock_deploy_site import deploy_site_drydock
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from failure_handlers import step_failure_handler
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from dag_deployment_configuration import get_deployment_configuration
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from preflight_checks import all_preflight_checks
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from validate_site_design import validate_site_design
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class CommonStepFactory(object):
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"""Common step factory
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A factory to generate steps that are reused among multiple dags
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"""
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def __init__(self, parent_dag_name, dag, default_args):
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"""Creates a factory
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Uses the specified parent_dag_name
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"""
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self.parent_dag_name = parent_dag_name
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self.dag = dag
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self.default_args = default_args
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def get_action_xcom(self, task_id=dn.ACTION_XCOM):
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"""Generate the action_xcom step
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Step responsible for getting the action information passed
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by the invocation of the dag, which includes any options.
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"""
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def xcom_push(**kwargs):
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"""xcom_push function
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Defines a push function to store the content of 'action' that is
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defined via 'dag_run' in XCOM so that it can be used by the
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Operators
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"""
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kwargs['ti'].xcom_push(key='action',
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value=kwargs['dag_run'].conf['action'])
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return PythonOperator(task_id=task_id,
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dag=self.dag,
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python_callable=xcom_push)
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def get_concurrency_check(self, task_id=dn.DAG_CONCURRENCY_CHECK_DAG_NAME):
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"""Generate the concurrency check step
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Concurrency check prevents simultaneous execution of dags that should
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not execute together.
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"""
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return ConcurrencyCheckOperator(
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task_id=task_id,
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on_failure_callback=step_failure_handler,
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dag=self.dag)
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def get_preflight(self, task_id=dn.ALL_PREFLIGHT_CHECKS_DAG_NAME):
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"""Generate the preflight step
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Preflight checks preconditions for running a DAG
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"""
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return SubDagOperator(
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subdag=all_preflight_checks(
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self.parent_dag_name,
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task_id,
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args=self.default_args),
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task_id=task_id,
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on_failure_callback=step_failure_handler,
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dag=self.dag)
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def get_get_design_version(self, task_id=dn.GET_DESIGN_VERSION):
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"""Generate the get design version step
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Retrieves the version of the design to use from deckhand
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"""
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return SubDagOperator(
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subdag=get_design_deckhand(
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self.parent_dag_name,
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task_id,
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args=self.default_args),
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task_id=task_id,
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on_failure_callback=step_failure_handler,
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dag=self.dag)
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def get_validate_site_design(self,
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task_id=dn.VALIDATE_SITE_DESIGN_DAG_NAME):
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"""Generate the validate site design step
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Validation of the site design checks that the design to be used
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for a deployment passes checks before using it.
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"""
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return SubDagOperator(
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subdag=validate_site_design(
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self.parent_dag_name,
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task_id,
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args=self.default_args),
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task_id=task_id,
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on_failure_callback=step_failure_handler,
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dag=self.dag)
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def get_deployment_configuration(self,
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task_id=dn.GET_DEPLOY_CONF_DAG_NAME):
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"""Generate the step to retrieve the deployment configuration
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This step provides the timings and strategies that will be used in
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subsequent steps
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"""
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return SubDagOperator(
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subdag=get_deployment_configuration(
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self.parent_dag_name,
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task_id,
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args=self.default_args),
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task_id=task_id,
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on_failure_callback=step_failure_handler,
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dag=self.dag)
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def get_drydock_build(self, task_id=dn.DRYDOCK_BUILD_DAG_NAME):
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"""Generate the drydock build step
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Drydock build does the hardware provisioning.
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"""
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return SubDagOperator(
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subdag=deploy_site_drydock(
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self.parent_dag_name,
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task_id,
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args=self.default_args),
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task_id=task_id,
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on_failure_callback=step_failure_handler,
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dag=self.dag)
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def get_armada_build(self, task_id=dn.ARMADA_BUILD_DAG_NAME):
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"""Generate the armada build step
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Armada build does the deployment of helm charts
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"""
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return SubDagOperator(
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subdag=deploy_site_armada(
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self.parent_dag_name,
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task_id,
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args=self.default_args),
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task_id=task_id,
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on_failure_callback=step_failure_handler,
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dag=self.dag)
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def get_destroy_server(self, task_id=dn.DESTROY_SERVER_DAG_NAME):
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"""Generate a destroy server step
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Destroy server tears down kubernetes and hardware
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"""
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return SubDagOperator(
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subdag=destroy_server(
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self.parent_dag_name,
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task_id,
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args=self.default_args),
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task_id=task_id,
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on_failure_callback=step_failure_handler,
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dag=self.dag)
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def get_decide_airflow_upgrade(self, task_id=dn.DECIDE_AIRFLOW_UPGRADE):
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"""Generate the decide_airflow_upgrade step
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Step responsible for deciding whether to branch to the path
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to upgrade airflow worker
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"""
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def upgrade_airflow_check(**kwargs):
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"""upgrade_airflow_check function
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Defines a function to decide whether to upgrade airflow
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worker. The decision will be based on the xcom value that
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is retrieved from the 'armada_post_apply' task
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"""
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# DAG ID will be parent + subdag name
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dag_id = self.parent_dag_name + '.' + dn.ARMADA_BUILD_DAG_NAME
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# Check if Shipyard/Airflow were upgraded by the workflow
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upgrade_airflow = kwargs['ti'].xcom_pull(
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key='upgrade_airflow_worker',
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task_ids='armada_post_apply',
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dag_id=dag_id)
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# Go to the branch to upgrade Airflow worker if the Shipyard
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# chart were upgraded/modified
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if upgrade_airflow == "true":
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return "upgrade_airflow"
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else:
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return "skip_upgrade_airflow"
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return BranchPythonOperator(task_id=task_id,
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python_callable=upgrade_airflow_check,
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trigger_rule="all_success",
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dag=self.dag)
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def get_upgrade_airflow(self, task_id=dn.UPGRADE_AIRFLOW):
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"""Generate the upgrade_airflow step
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Step responsible for upgrading airflow worker. Step will
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execute the upgrade script in the background and direct
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output to null so that 'nohup.out' will not be created.
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Note that this is done intentionally so that the upgrade
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of airflow worker will only start after the completion of
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the 'update_site' workflow. This will ensure availability
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of airflow worker during update/upgrade and prevent any
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disruption to the workflow. Note that dag_id and execution
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date are required for proper execution of the script.
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"""
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return BashOperator(task_id=task_id,
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bash_command=(
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"nohup "
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"/usr/local/airflow/upgrade_airflow_worker.sh "
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"{{ ti.dag_id }} {{ ti.execution_date }} "
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">/dev/null 2>&1 &"),
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dag=self.dag)
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def get_skip_upgrade_airflow(self, task_id=dn.SKIP_UPGRADE_AIRFLOW):
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"""Generate the skip_upgrade_airflow step
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Step will print a message stating that we do not need to
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upgrade the airflow worker
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"""
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return BashOperator(task_id=task_id,
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bash_command=(
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"echo 'Airflow Worker Upgrade Not Required'"),
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dag=self.dag)
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