85 lines
3.2 KiB
Python
85 lines
3.2 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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import logging
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LOG = logging.getLogger(__name__)
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class XcomPuller(object):
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"""XcomPuller provides a common source to get reused xcom values
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One XcomPuller should be created per task.
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Note: xcom values are found by using the current task instance
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and finding the <dag_name>.<task_name> that the xcom was added
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to the workflow.
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The point of this class is to keep all this very configurable
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naming in one place as much as possible so that changes to
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the dag names and step names have less places to update.
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"""
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def __init__(self, main_dag_name, task_instance):
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self.mdn = main_dag_name
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self.ti = task_instance
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def _get_xcom(self, source_task, dag_id=None, key=None, log_result=True):
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"""Find a particular xcom value"""
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if dag_id is None:
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source_dag = self.mdn
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else:
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source_dag = "{}.{}".format(self.mdn, dag_id)
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LOG.info("Retrieving xcom from %s.%s with key %s",
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source_dag,
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source_task,
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key)
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xcom_val = self.ti.xcom_pull(task_ids=source_task,
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dag_id=source_dag,
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key=key)
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if log_result:
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# log the xcom value - don't put large values in xcom!
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LOG.info(xcom_val)
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return xcom_val
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def get_deployment_configuration(self):
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"""Retrieve the deployment configuration dictionary"""
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source_task = 'get_deployment_configuration'
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source_dag = 'dag_deployment_configuration'
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key = None
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return self._get_xcom(source_task=source_task,
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dag_id=source_dag,
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key=key)
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def get_action_info(self):
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"""Retrive the action and action parameter info dictionary
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Extract information related to current workflow. This is a dictionary
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that contains information about the workflow such as action_id, name
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and other related parameters
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"""
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source_task = 'action_xcom'
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source_dag = None
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key = 'action'
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return self._get_xcom(source_task=source_task,
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dag_id=source_dag,
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key=key)
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def get_design_version(self):
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"""Retrieve the design version being used for this workflow"""
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source_task = 'deckhand_get_design_version'
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source_dag = 'deckhand_get_design_version'
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key = None
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return self._get_xcom(source_task=source_task,
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dag_id=source_dag,
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key=key)
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