Source code for airflow.contrib.sensors.emr_base_sensor

# -*- coding: utf-8 -*-
#
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements.  See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership.  The ASF licenses this file
# to you 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.sensors.base_sensor_operator import BaseSensorOperator
from airflow.utils import apply_defaults
from airflow.exceptions import AirflowException


[docs]class EmrBaseSensor(BaseSensorOperator): """ Contains general sensor behavior for EMR. Subclasses should implement get_emr_response() and state_from_response() methods. Subclasses should also implement NON_TERMINAL_STATES and FAILED_STATE constants. """
[docs] ui_color = '#66c3ff'
@apply_defaults def __init__( self, aws_conn_id='aws_default', *args, **kwargs): super(EmrBaseSensor, self).__init__(*args, **kwargs) self.aws_conn_id = aws_conn_id
[docs] def poke(self, context): response = self.get_emr_response() if not response['ResponseMetadata']['HTTPStatusCode'] == 200: self.log.info('Bad HTTP response: %s', response) return False state = self.state_from_response(response) self.log.info('Job flow currently %s', state) if state in self.NON_TERMINAL_STATES: return False if state in self.FAILED_STATE: final_message = 'EMR job failed' failure_message = self.failure_message_from_response(response) if failure_message: final_message += ' ' + failure_message raise AirflowException(final_message) return True