82 lines
2.7 KiB
Python
82 lines
2.7 KiB
Python
# -*- 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 TaskStateOperator(BaseOperator):
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"""
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Retrieve Task State
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:airflow_dag_id: Dag ID
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:airflow_task_id: Task ID
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:airflow_execution_date: Task Execution Date
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"""
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@apply_defaults
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def __init__(self,
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airflow_command=None,
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airflow_dag_id=None,
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airflow_task_id=None,
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airflow_execution_date=None,
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*args, **kwargs):
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super(TaskStateOperator, self).__init__(*args, **kwargs)
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self.airflow_dag_id = airflow_dag_id
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self.airflow_task_id = airflow_task_id
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self.airflow_execution_date = airflow_execution_date
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self.airflow_command = "%s %s %s %s" % ("airflow task_state", airflow_dag_id, airflow_task_id, airflow_execution_date)
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def execute(self, context):
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logging.info("Running Airflow Command: " + self.airflow_command)
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# Execute Airflow CLI Command
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airflow_cli = subprocess.Popen(shlex.split(self.airflow_command), stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
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# Logs Output
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# Filter out logging messages from standard output and keep only the relevant information
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line = ''
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for line in iter(airflow_cli.stdout.readline, b''):
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line = line.strip()
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if line.startswith( '[' ):
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pass
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else:
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logging.info(line)
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task_state = line
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# Wait for child process to terminate. Set and return returncode attribute.
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airflow_cli.wait()
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# Raise Execptions if Task State Command Fails
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if airflow_cli.returncode:
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raise AirflowException("Failed to Retrieve Task State")
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# Return XCOM State
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task_instance = context['task_instance']
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task_instance.xcom_push('task_state', task_state)
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class TaskStatePlugin(AirflowPlugin):
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name = "task_state_plugin"
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operators = [TaskStateOperator]
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