mirror of https://github.com/nocturn9x/giambio.git
91 lines
2.8 KiB
Python
91 lines
2.8 KiB
Python
"""
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Higher-level context managers for async pools
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Copyright (C) 2020 nocturn9x
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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"""
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import types
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from giambio.objects import Task
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from giambio.core import AsyncScheduler
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class TaskManager:
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"""
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An asynchronous context manager for giambio
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"""
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def __init__(self, loop: AsyncScheduler, timeout: float = None) -> None:
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"""
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Object constructor
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"""
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self.loop = loop
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self.tasks = [] # We store a reference to all tasks in this pool, even the paused ones!
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self.cancelled = False
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self.started = self.loop.clock()
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if timeout:
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self.timeout = self.started + timeout
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else:
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self.timeout = None
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def spawn(self, func: types.FunctionType, *args):
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"""
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Spawns a child task
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"""
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task = Task(func(*args), func.__name__ or str(func), self)
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task.joiners = [self.loop.current_task]
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task.next_deadline = self.timeout or 0.0
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self.loop.tasks.append(task)
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self.loop.debugger.on_task_spawn(task)
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self.tasks.append(task)
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return task
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def spawn_after(self, func: types.FunctionType, n: int, *args):
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"""
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Schedules a task for execution after n seconds
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"""
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assert n >= 0, "The time delay can't be negative"
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task = Task(func(*args), func.__name__ or str(func), self)
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task.joiners = [self.loop.current_task]
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task.next_deadline = self.timeout or 0.0
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task.sleep_start = self.loop.clock()
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self.loop.paused.put(task, n)
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self.loop.debugger.on_task_schedule(task, n)
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self.tasks.append(task)
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return task
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async def __aenter__(self):
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return self
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async def __aexit__(self, exc_type: Exception, exc: Exception, tb):
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for task in self.tasks:
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# This forces Python to stop at the
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# end of the block and wait for all
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# children to exit
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await task.join()
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self.tasks.remove(task)
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async def cancel(self):
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"""
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Cancels the whole block
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"""
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# TODO: This breaks, somehow, investigation needed
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for task in self.tasks:
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await task.cancel()
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