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# Licensed to the StackStorm, Inc ('StackStorm') under one or more |
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# contributor license agreements. See the NOTICE file distributed with |
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# this work for additional information regarding copyright ownership. |
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# The ASF licenses this file to You under the Apache License, Version 2.0 |
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# (the "License"); you may not use this file except in compliance with |
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# the License. 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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from __future__ import absolute_import |
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import kombu |
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from orchestra import states |
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from st2common import log as logging |
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from st2common.models.db import workflow as wf_db_models |
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from st2common.services import workflows as wf_svc |
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from st2common.transport import consumers |
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from st2common.transport import queues |
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from st2common.transport import utils as txpt_utils |
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LOG = logging.getLogger(__name__) |
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WORKFLOW_EXECUTION_QUEUES = [ |
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queues.WORKFLOW_EXECUTION_WORK_QUEUE, |
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queues.WORKFLOW_EXECUTION_RESUME_QUEUE |
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] |
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class WorkflowDispatcher(consumers.MessageHandler): |
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message_type = wf_db_models.WorkflowExecutionDB |
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def __init__(self, connection, queues): |
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super(WorkflowDispatcher, self).__init__(connection, queues) |
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def get_queue_consumer(self, connection, queues): |
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# We want to use a special ActionsQueueConsumer which uses 2 dispatcher pools |
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return consumers.QueueConsumer(connection=connection, queues=queues, handler=self) |
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def process(self, wf_ex_db): |
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# Refresh record from the database in case the request is in the queue for too long. |
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conductor, wf_ex_db = wf_svc.refresh_conductor(str(wf_ex_db.id)) |
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# Continue if workflow is still active. |
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if conductor.get_workflow_state() not in states.COMPLETED_STATES: |
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# Set workflow to running state. |
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conductor.set_workflow_state(states.RUNNING) |
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# Identify the next set of tasks to execute. |
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next_tasks = conductor.get_next_tasks() |
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# If there is no new tasks, update execution records to handle possible completion. |
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if not next_tasks: |
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# Update workflow execution and related liveaction and action execution. |
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wf_svc.update_execution_records(wf_ex_db, conductor) |
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# If workflow execution is no longer active, then stop processing here. |
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if wf_ex_db.status in states.COMPLETED_STATES: |
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return |
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# Iterate while there are next tasks identified for processing. In the case for |
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# task with no action execution defined, the task execution will complete |
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# immediately with a new set of tasks available. |
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while next_tasks: |
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# Mark the tasks as running in the task flow before actual task execution. |
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for task in next_tasks: |
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conductor.update_task_flow(task['id'], states.RUNNING) |
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# Update workflow execution and related liveaction and action execution. |
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wf_svc.update_execution_records(wf_ex_db, conductor) |
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# If workflow execution is no longer active, then stop processing here. |
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if wf_ex_db.status in states.COMPLETED_STATES: |
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break |
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# Request task execution for the tasks. |
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for task in next_tasks: |
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try: |
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task_id, task_spec, task_ctx = task['id'], task['spec'], task['ctx'] |
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st2_ctx = {'execution_id': wf_ex_db.action_execution} |
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wf_svc.request_task_execution(wf_ex_db, task_id, task_spec, task_ctx, st2_ctx) |
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except Exception as e: |
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wf_svc.fail_workflow_execution(str(wf_ex_db.id), e, task_id=task['id']) |
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return |
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# Identify the next set of tasks to execute. |
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conductor, wf_ex_db = wf_svc.refresh_conductor(str(wf_ex_db.id)) |
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next_tasks = conductor.get_next_tasks() |
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def get_engine(): |
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with kombu.Connection(txpt_utils.get_messaging_urls()) as conn: |
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return WorkflowDispatcher(conn, WORKFLOW_EXECUTION_QUEUES) |
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StackStorm /
st2
Loading history...
It is generally a bad practice to shadow variables from the outer-scope. In most cases, this is done unintentionally and might lead to unexpected behavior: