122 lines
3.3 KiB
Python
122 lines
3.3 KiB
Python
# Eos - Verifiable elections
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# Copyright © 2017 RunasSudo (Yingtong Li)
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Affero General Public License for more details.
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#
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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from eos.core.objects import *
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class WorkflowTask(EmbeddedObject):
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class Status:
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NOT_READY = 10
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READY = 20
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#ENTERED = 30
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#COMPLETE = 40
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EXITED = 50
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depends_on = []
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provides = []
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status = IntField()
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def __init__(self, *args, **kwargs):
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super().__init__(*args, **kwargs)
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def post_init(self):
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super().post_init()
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self.workflow = self.recurse_parents(Workflow)
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self.status = WorkflowTask.Status.READY if self.are_dependencies_met() else WorkflowTask.Status.NOT_READY
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self.listeners = {
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'exit': []
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}
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# Helpers
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def on_dependency_exit():
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self.status = WorkflowTask.Status.READY if self.are_dependencies_met() else WorkflowTask.Status.NOT_READY
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for depends_on_desc in self.depends_on:
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for depends_on_task in self.workflow.get_tasks(depends_on_desc):
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depends_on_task.listeners['exit'].append(on_dependency_exit)
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def are_dependencies_met(self):
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for depends_on_desc in self.depends_on:
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for depends_on_task in self.workflow.get_tasks(depends_on_desc):
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if depends_on_task.status is not WorkflowTask.Status.EXITED:
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return False
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return True
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@classmethod
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def satisfies(cls, descriptor):
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return cls._name == descriptor or descriptor in cls.provides
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def fire_event(self, event):
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for listener in self.listeners[event]:
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listener()
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def exit(self):
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if self.status is not WorkflowTask.Status.READY:
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raise Exception('Attempted to exit a task when not ready')
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self.status = WorkflowTask.Status.EXITED
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self.fire_event('exit')
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class Workflow(EmbeddedObject):
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tasks = EmbeddedObjectListField()
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meta = {
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'abstract': True
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}
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def __init__(self, *args, **kwargs):
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super().__init__(*args, **kwargs)
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def get_tasks(self, descriptor):
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#yield from (task for task in self.tasks if task.satisfies(descriptor))
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for i in range(len(self.tasks)):
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task = self.tasks[i]
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if task.satisfies(descriptor):
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yield task
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def get_task(self, descriptor):
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try:
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return next(self.get_tasks(descriptor))
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except StopIteration:
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return None
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# Concrete tasks
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# ==============
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class TaskConfigureElection(WorkflowTask):
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#def on_enter(self):
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# self.status = WorkflowTask.Status.COMPLETE
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pass
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class TaskOpenVoting(WorkflowTask):
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depends_on = ['eos.base.workflow.TaskConfigureElection']
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class TaskCloseVoting(WorkflowTask):
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depends_on = ['eos.base.workflow.TaskOpenVoting']
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# Concrete workflows
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# ==================
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class WorkflowBase(Workflow):
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def __init__(self, *args, **kwargs):
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super().__init__(*args, **kwargs)
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self.tasks.append(TaskConfigureElection())
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self.tasks.append(TaskOpenVoting())
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self.tasks.append(TaskCloseVoting())
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