old_contents: # -*- 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.
  
  import logging
  
  from airflow.models import BaseOperator
  from airflow.utils import apply_defaults
  from airflow.exceptions import AirflowException
  from airflow.contrib.hooks.emr_hook import EmrHook
  
  
  class EmrAddStepsOperator(BaseOperator):
      """
      An operator that adds steps to an existing EMR job_flow.
  
      :param job_flow_id: id of the JobFlow to add steps to
      :type job_flow_name: str
      :param aws_conn_id: aws connection to uses
      :type aws_conn_id: str
      :param steps: boto3 style steps to be added to the jobflow
      :type steps: list
      """
      template_fields = ['job_flow_id']
      template_ext = ()
      ui_color = '#f9c915'
  
      @apply_defaults
      def __init__(
              self,
              job_flow_id,
              aws_conn_id='s3_default',
              steps=None,
              *args, **kwargs):
          super(EmrAddStepsOperator, self).__init__(*args, **kwargs)
          steps = steps or []
          self.job_flow_id = job_flow_id
          self.aws_conn_id = aws_conn_id
          self.steps = steps
  
      def execute(self, context):
          emr = EmrHook(aws_conn_id=self.aws_conn_id).get_conn()
  
          logging.info('Adding steps to %s', self.job_flow_id)
          response = emr.add_job_flow_steps(JobFlowId=self.job_flow_id, Steps=self.steps)
  
          if not response['ResponseMetadata']['HTTPStatusCode'] == 200:
              raise AirflowException('Adding steps failed: %s' % response)
          else:
              logging.info('Steps %s added to JobFlow', response['StepIds'])
              return response['StepIds']
  
new_contents: # -*- 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.
  
  import logging
  
  from airflow.models import BaseOperator
  from airflow.utils import apply_defaults
  from airflow.exceptions import AirflowException
  from airflow.contrib.hooks.emr_hook import EmrHook
  
  
  class EmrAddStepsOperator(BaseOperator):
      """
      An operator that adds steps to an existing EMR job_flow.
  
      :param job_flow_id: id of the JobFlow to add steps to
      :type job_flow_name: str
      :param aws_conn_id: aws connection to uses
      :type aws_conn_id: str
      :param steps: boto3 style steps to be added to the jobflow
      :type steps: list
      """
      template_fields = ['job_flow_id', 'steps']
      template_ext = ()
      ui_color = '#f9c915'
  
      @apply_defaults
      def __init__(
              self,
              job_flow_id,
              aws_conn_id='s3_default',
              steps=None,
              *args, **kwargs):
          super(EmrAddStepsOperator, self).__init__(*args, **kwargs)
          steps = steps or []
          self.job_flow_id = job_flow_id
          self.aws_conn_id = aws_conn_id
          self.steps = steps
  
      def execute(self, context):
          emr = EmrHook(aws_conn_id=self.aws_conn_id).get_conn()
  
          logging.info('Adding steps to %s', self.job_flow_id)
          response = emr.add_job_flow_steps(JobFlowId=self.job_flow_id, Steps=self.steps)
  
          if not response['ResponseMetadata']['HTTPStatusCode'] == 200:
              raise AirflowException('Adding steps failed: %s' % response)
          else:
              logging.info('Steps %s added to JobFlow', response['StepIds'])
              return response['StepIds']
  
subject: Add 'steps' into template_fields in EmrAddSteps