22ce7af298
* Renaming methods in task_handler * Deleted unused method in workflow/utils.py * Made signature of on_task_state_change more consistent with other methods * Other minor things Change-Id: Iaa83d3cdbd1836366401cb5558f194181b421511
138 lines
3.6 KiB
Python
138 lines
3.6 KiB
Python
# Copyright 2015 - 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 mistral.workbook import parser as spec_parser
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from mistral.workflow import states
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class WorkflowCommand(object):
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"""Workflow command.
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A set of workflow commands form a communication protocol between workflow
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handler and its clients. When workflow handler makes a decision about
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how to continue a workflow it returns a set of commands so that a caller
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knows what to do next.
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"""
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def __init__(self, wf_ex, task_spec, ctx):
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self.wf_ex = wf_ex
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self.task_spec = task_spec
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self.ctx = ctx or {}
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class Noop(WorkflowCommand):
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"""No-operation command."""
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def __repr__(self):
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return "NOOP [workflow=%s]" % self.wf_ex.name
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class RunTask(WorkflowCommand):
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"""Instruction to run a workflow task."""
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def __repr__(self):
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return (
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"Run task [workflow=%s, task=%s]"
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% (self.wf_ex.name, self.task_spec.get_name())
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)
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class RunExistingTask(WorkflowCommand):
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"""Command for running already existent task."""
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def __init__(self, task_ex):
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wf_ex = task_ex.workflow_execution
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task_spec = spec_parser.get_task_spec(task_ex.spec)
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self.task_ex = task_ex
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super(RunExistingTask, self).__init__(
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wf_ex, task_spec, task_ex.in_context
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)
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class SetWorkflowState(WorkflowCommand):
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"""Instruction to change a workflow state."""
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def __init__(self, wf_ex, task_spec, ctx, new_state, msg):
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super(SetWorkflowState, self).__init__(wf_ex, task_spec, ctx)
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self.new_state = new_state
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self.msg = msg
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class FailWorkflow(SetWorkflowState):
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"""Instruction to fail a workflow."""
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def __init__(self, wf_ex, task_spec, ctx, msg=None):
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super(FailWorkflow, self).__init__(
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wf_ex,
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task_spec,
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ctx,
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states.ERROR,
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msg
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)
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def __repr__(self):
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return "Fail [workflow=%s]" % self.wf_ex.name
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class SucceedWorkflow(SetWorkflowState):
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"""Instruction to succeed a workflow."""
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def __init__(self, wf_ex, task_spec, ctx, msg=None):
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super(SucceedWorkflow, self).__init__(
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wf_ex,
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task_spec,
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ctx,
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states.SUCCESS,
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msg
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)
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def __repr__(self):
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return "Succeed [workflow=%s]" % self.wf_ex.name
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class PauseWorkflow(SetWorkflowState):
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"""Instruction to pause a workflow."""
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def __init__(self, wf_ex, task_spec, ctx, msg=None):
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super(PauseWorkflow, self).__init__(
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wf_ex,
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task_spec,
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ctx,
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states.PAUSED,
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msg
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)
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def __repr__(self):
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return "Pause [workflow=%s]" % self.wf_ex.name
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RESERVED_CMDS = {
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'noop': Noop,
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'fail': FailWorkflow,
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'succeed': SucceedWorkflow,
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'pause': PauseWorkflow
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}
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def get_command_class(cmd_name):
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return RESERVED_CMDS[cmd_name] if cmd_name in RESERVED_CMDS else None
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def create_command(cmd_name, wf_ex, task_spec, ctx):
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cmd_cls = get_command_class(cmd_name) or RunTask
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return cmd_cls(wf_ex, task_spec, ctx)
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