Add OpenStack Operator
Define as a plugin so that Airflow is able to pick up the plugin and all the operators it define
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# -*- coding: utf-8 -*-
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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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"""
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OpenStack CLI
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Perform basic OpenStack CLI calls
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### Openstack CLI Dag
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"""
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import airflow
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from airflow import DAG
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from airflow.operators import OpenStackOperator
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from airflow.operators.bash_operator import BashOperator
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from datetime import datetime, timedelta
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import os
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default_args = {
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'owner': 'airflow',
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'depends_on_past': False,
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'start_date': datetime(2017, 6, 14),
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'email': ['airflow@airflow.com'],
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'start_date': airflow.utils.dates.days_ago(2),
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'email': ['airflow@example.com'],
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'email_on_failure': False,
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'email_on_retry': False,
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'retries': 1,
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'retry_delay': timedelta(minutes=5),
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'retry_delay': timedelta(minutes=1),
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}
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dag = DAG('openstack_api_call', default_args=default_args, schedule_interval=None)
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dag = DAG('openstack_cli', default_args=default_args, schedule_interval=None)
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# print_date
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t1 = BashOperator(
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@ -27,21 +40,36 @@ t1 = BashOperator(
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bash_command='date',
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dag=dag)
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# Current assumption is that we will be able to retrieve information from
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# data manager (DeckHand) to create the admin-openrc.sh that is needed for
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# airflow to perform OpenStack API calls
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t2 = BashOperator(
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task_id='nova_list',
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bash_command='source ' + os.getcwd() + '/dags/admin-openrc.sh' + ';' + 'nova' + ' list',
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retries=3,
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# openstack endpoint list
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t2 = OpenStackOperator(
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task_id='endpoint_list_task',
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openrc_file='/home/ubuntu/airflow/openrc.sh',
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openstack_command='openstack endpoint list',
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dag=dag)
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t3 = BashOperator(
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task_id='neutron_net_list',
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bash_command='source ' + os.getcwd() + '/dags/admin-openrc.sh' + ';' + 'neutron' + ' net-list',
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retries=3,
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# openstack service list
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t3 = OpenStackOperator(
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task_id='service_list_task',
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openrc_file='/home/ubuntu/airflow/openrc.sh',
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openstack_command='openstack service list',
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dag=dag)
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# openstack server list
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t4 = OpenStackOperator(
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task_id='server_list_task',
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openrc_file='/home/ubuntu/airflow/openrc.sh',
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openstack_command='openstack server list',
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dag=dag)
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# openstack network list
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t5 = OpenStackOperator(
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task_id='network_list_task',
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openrc_file='/home/ubuntu/airflow/openrc.sh',
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openstack_command='openstack network list',
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dag=dag)
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t2.set_upstream(t1)
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t3.set_upstream(t1)
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t4.set_upstream(t1)
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t5.set_upstream(t1)
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@ -0,0 +1,88 @@
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# -*- coding: utf-8 -*-
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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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import logging
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import subprocess
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import sys
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import os
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import shlex
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from airflow.exceptions import AirflowException
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from airflow.models import BaseOperator
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from airflow.plugins_manager import AirflowPlugin
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from airflow.utils.decorators import apply_defaults
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class OpenStackOperator(BaseOperator):
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"""
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Performs OpenStack CLI calls
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:openrc_file: Path of the openrc file
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:openstack_command: The OpenStack command to be executed
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"""
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@apply_defaults
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def __init__(self,
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openrc_file,
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openstack_command=None,
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xcom_push=False,
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*args, **kwargs):
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super(OpenStackOperator, self).__init__(*args, **kwargs)
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self.openrc_file = openrc_file
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self.openstack_command = openstack_command
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self.xcom_push_flag = xcom_push
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def execute(self, context):
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logging.info("Running OpenStack Command: " + self.openstack_command)
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# Emulate "source" in bash. Sets up environment variables.
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pipe = subprocess.Popen(". %s; env" % self.openrc_file, stdout=subprocess.PIPE, shell=True)
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data = pipe.communicate()[0]
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env = dict((line.split("=", 1) for line in data.splitlines()))
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os.environ.update(env)
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# Execute the OpenStack CLI Command
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openstack_cli = subprocess.Popen(shlex.split(self.openstack_command), stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
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# Logs Output
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logging.info("Output:")
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line = ''
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for line in iter(openstack_cli.stdout.readline, b''):
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line = line.strip()
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logging.info(line)
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# Wait for child process to terminate. Set and return returncode attribute.
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openstack_cli.wait()
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logging.info("Command exited with "
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"return code {0}".format(openstack_cli.returncode))
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# Raise Execptions if OpenStack Command Fails
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if openstack_cli.returncode:
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raise AirflowException("OpenStack Command Failed")
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"""
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Push response to an XCom if xcom_push is True
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"""
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if self.xcom_push_flag:
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return line
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class OpenStackCliPlugin(AirflowPlugin):
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name = "openstack_cli_plugin"
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operators = [OpenStackOperator]
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