68 lines
2.5 KiB
Python
68 lines
2.5 KiB
Python
# Copyright (c) 2018, Neil Booth
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#
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# All rights reserved.
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#
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# The MIT License (MIT)
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#
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# Permission is hereby granted, free of charge, to any person obtaining
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# a copy of this software and associated documentation files (the
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# "Software"), to deal in the Software without restriction, including
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# without limitation the rights to use, copy, modify, merge, publish,
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# distribute, sublicense, and/or sell copies of the Software, and to
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# permit persons to whom the Software is furnished to do so, subject to
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# the following conditions:
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#
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# The above copyright notice and this permission notice shall be
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# included in all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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# and warranty status of this software.
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'''Concurrency via tasks and threads.'''
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from aiorpcx import TaskSet
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import electrumx.lib.util as util
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class Tasks(object):
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# Functionality here will be incorporated into aiorpcX's TaskSet
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# after experience is gained.
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def __init__(self, *, loop=None):
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self.tasks = TaskSet(loop=loop)
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self.logger = util.class_logger(__name__, self.__class__.__name__)
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# Pass through until integrated
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self.loop = self.tasks.loop
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self.wait = self.tasks.wait
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async def run_in_thread(self, func, *args):
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'''Run a function in a separate thread, and await its completion.'''
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return await self.loop.run_in_executor(None, func, *args)
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def create_task(self, coro, callback=None):
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'''Schedule the coro to be run.'''
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task = self.tasks.create_task(coro)
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task.add_done_callback(callback or self._check_task_exception)
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return task
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def _check_task_exception(self, task):
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'''Check a task for exceptions.'''
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try:
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if not task.cancelled():
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task.result()
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except Exception as e:
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self.logger.exception(f'uncaught task exception: {e}')
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async def cancel_all(self, wait=True):
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'''Cancels all tasks and waits for them to complete.'''
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self.tasks.cancel_all()
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if wait:
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await self.tasks.wait()
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