80b9457576
Change-Id: I0441957671a4227f89ecf3fb57a3b811230a5b9b
321 lines
8.9 KiB
Python
321 lines
8.9 KiB
Python
# Copyright 2014 - Mirantis, Inc.
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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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from oslo.config import cfg
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from oslo import messaging
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from mistral import context as auth_ctx
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from mistral.engine1 import base
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from mistral.openstack.common import log as logging
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from mistral.workflow import utils as wf_utils
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LOG = logging.getLogger(__name__)
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_TRANSPORT = None
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_ENGINE_CLIENT = None
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_EXECUTOR_CLIENT = None
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def get_transport():
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global _TRANSPORT
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if not _TRANSPORT:
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_TRANSPORT = messaging.get_transport(cfg.CONF)
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return _TRANSPORT
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def get_engine_client():
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global _ENGINE_CLIENT
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if not _ENGINE_CLIENT:
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_ENGINE_CLIENT = EngineClient(get_transport())
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return _ENGINE_CLIENT
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def get_executor_client():
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global _EXECUTOR_CLIENT
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if not _EXECUTOR_CLIENT:
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_EXECUTOR_CLIENT = ExecutorClient(get_transport())
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return _EXECUTOR_CLIENT
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class EngineServer(object):
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"""RPC Engine server."""
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def __init__(self, engine):
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self._engine = engine
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def start_workflow(self, rpc_ctx, workflow_name, workflow_input, params):
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"""Receives calls over RPC to start workflows on engine.
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:param rpc_ctx: RPC request context.
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:return: Workflow execution.
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"""
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LOG.info(
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"Received RPC request 'start_workflow'[rpc_ctx=%s,"
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" workflow_name=%s, workflow_input=%s, params=%s]"
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% (rpc_ctx, workflow_name, workflow_input, params)
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)
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return self._engine.start_workflow(
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workflow_name,
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workflow_input,
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**params
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)
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def on_task_result(self, rpc_ctx, task_id, result_data, result_error):
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"""Receives calls over RPC to communicate task result to engine.
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:param rpc_ctx: RPC request context.
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:return: Task.
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"""
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task_result = wf_utils.TaskResult(result_data, result_error)
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LOG.info(
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"Received RPC request 'on_task_result'[rpc_ctx=%s,"
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" task_id=%s, task_result=%s]" % (rpc_ctx, task_id, task_result)
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)
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return self._engine.on_task_result(task_id, task_result)
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def run_task(self, rpc_ctx, task_id):
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"""Runs task with given id..
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:param rpc_ctx: RPC request context.
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:param task_id: Task id.
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"""
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LOG.info(
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"Received RPC request 'run_task'[rpc_ctx=%s, task_id=%s]" %
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(rpc_ctx, task_id)
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)
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return self._engine.run_task(task_id)
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def pause_workflow(self, rpc_ctx, execution_id):
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"""Receives calls over RPC to pause workflows on engine.
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:param rpc_ctx: Request context.
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:return: Workflow execution.
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"""
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LOG.info(
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"Received RPC request 'pause_workflow'[rpc_ctx=%s,"
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" execution_id=%s]" % (rpc_ctx, execution_id)
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)
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return self._engine.pause_workflow(execution_id)
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def resume_workflow(self, rpc_ctx, execution_id):
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"""Receives calls over RPC to resume workflows on engine.
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:param rpc_ctx: RPC request context.
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:return: Workflow execution.
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"""
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LOG.info(
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"Received RPC request 'resume_workflow'[rpc_ctx=%s,"
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" execution_id=%s]" % (rpc_ctx, execution_id)
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)
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return self._engine.resume_workflow(execution_id)
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def rollback_workflow(self, rpc_ctx, execution_id):
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"""Receives calls over RPC to rollback workflows on engine.
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:param rpc_ctx: RPC request context.
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:return: Workflow execution.
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"""
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LOG.info(
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"Received RPC request 'rollback_workflow'[rpc_ctx=%s,"
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" execution_id=%s]" % (rpc_ctx, execution_id)
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)
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return self._engine.resume_workflow(execution_id)
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class EngineClient(base.Engine):
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"""RPC Engine client."""
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def __init__(self, transport):
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"""Constructs an RPC client for engine.
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:param transport: Messaging transport.
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"""
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serializer = auth_ctx.RpcContextSerializer(
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auth_ctx.JsonPayloadSerializer())
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self._client = messaging.RPCClient(
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transport,
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messaging.Target(topic=cfg.CONF.engine.topic),
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serializer=serializer
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)
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def start_workflow(self, workflow_name, workflow_input, **params):
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"""Starts workflow sending a request to engine over RPC.
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:return: Workflow execution.
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"""
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return self._client.call(
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auth_ctx.ctx(),
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'start_workflow',
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workflow_name=workflow_name,
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workflow_input=workflow_input or {},
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params=params
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)
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def on_task_result(self, task_id, raw_result):
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"""Conveys task result to Mistral Engine.
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This method should be used by clients of Mistral Engine to update
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state of a task once task action has been performed. One of the
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clients of this method is Mistral REST API server that receives
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task result from the outside action handlers.
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Note: calling this method serves an event notifying Mistral that
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it possibly needs to move the workflow on, i.e. run other workflow
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tasks for which all dependencies are satisfied.
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:return: Task.
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"""
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return self._client.call(
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auth_ctx.ctx(),
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'on_task_result',
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task_id=task_id,
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result_data=raw_result.data,
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result_error=raw_result.error
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)
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def run_task(self, task_id):
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"""Runs task with given id.
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:param task_id: Task id.
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"""
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return self._client.call(auth_ctx.ctx(),
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'run_task',
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task_id=task_id)
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def pause_workflow(self, execution_id):
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"""Stops the workflow with the given execution id.
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:return: Workflow execution.
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"""
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return self._client.call(
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auth_ctx.ctx(),
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'pause_workflow',
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execution_id=execution_id
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)
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def resume_workflow(self, execution_id):
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"""Resumes the workflow with the given execution id.
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:return: Workflow execution.
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"""
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return self._client.call(
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auth_ctx.ctx(),
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'resume_workflow',
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execution_id=execution_id
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)
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def rollback_workflow(self, execution_id):
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"""Rolls back the workflow with the given execution id.
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:return: Workflow execution.
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"""
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return self._client.call(
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auth_ctx.ctx(),
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'rollback_workflow',
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execution_id=execution_id
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)
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class ExecutorServer(object):
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"""RPC Executor server."""
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def __init__(self, executor):
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self._executor = executor
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def run_action(self, rpc_ctx, task_id, action_class_str,
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attributes, params):
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"""Receives calls over RPC to run task on engine.
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:param rpc_ctx: RPC request context dictionary.
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"""
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LOG.info(
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"Received RPC request 'run_action'[rpc_ctx=%s,"
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" task_id=%s, action_class=%s, attributes=%s, params=%s]"
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% (rpc_ctx, task_id, action_class_str, attributes, params)
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)
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self._executor.run_action(task_id, action_class_str,
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attributes, params)
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class ExecutorClient(base.Executor):
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"""RPC Executor client."""
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def __init__(self, transport):
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"""Constructs an RPC client for the Executor.
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:param transport: Messaging transport.
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:type transport: Transport.
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"""
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serializer = auth_ctx.RpcContextSerializer(
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auth_ctx.JsonPayloadSerializer()
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)
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self.topic = cfg.CONF.executor.topic
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self._client = messaging.RPCClient(
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transport,
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messaging.Target(),
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serializer=serializer
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)
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def run_action(self, task_id, action_class_str, attributes,
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action_params, target=None):
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"""Sends a request to run action to executor."""
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kwargs = {
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'task_id': task_id,
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'action_class_str': action_class_str,
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'attributes': attributes,
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'params': action_params
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}
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if target:
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self._cast_run_action(self.topic, target, **kwargs)
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else:
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self._cast_run_action(self.topic, **kwargs)
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def _cast_run_action(self, topic, target=None, **kwargs):
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self._client.prepare(topic=topic, server=target).cast(
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auth_ctx.ctx(),
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'run_action',
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**kwargs
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)
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