105 lines
2.4 KiB
Python
105 lines
2.4 KiB
Python
"""
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aiosched: Yet another Python async scheduler
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Copyright (C) 2022 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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https: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 traceback
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from aiosched.task import Task
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class SchedulerError(Exception):
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"""
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A generic scheduler error
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"""
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class InternalError(SchedulerError):
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"""
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Internal exception
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"""
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class ResourceBusy(SchedulerError):
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"""
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Exception that is raised when a resource is
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accessed by more than one task at a time
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"""
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class ResourceClosed(SchedulerError):
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"""
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Raised when I/O is attempted on a closed
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resource
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"""
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class ResourceBroken(SchedulerError):
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"""
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Raised when I/O is attempted on a broken
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resource
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"""
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class TimedOutError(SchedulerError):
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"""
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This is raised if a timeout expires
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"""
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task: Task
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class Cancelled(BaseException):
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"""
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A cancellation exception.
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Inherits from BaseException as
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it is not meant to be caught
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"""
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task: Task
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class ErrorStack(SchedulerError):
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"""
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This exception wraps multiple exceptions and
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shows each individual traceback of them when
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printed. This is to ensure that no exception is
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lost even if 2 or more tasks raise at the
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same time or during cancellation of other
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tasks
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"""
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def __init__(self, errors: list[BaseException]):
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"""
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Object constructor
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"""
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super().__init__()
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self.errors = errors
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def __str__(self):
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"""
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Returns str(self)
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"""
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tracebacks = ""
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for i, err in enumerate(self.errors):
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if i not in (1, len(self.errors)):
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tracebacks += (
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f"\n{''.join(traceback.format_exception(type(err), err, err.__traceback__))}\n{'-' * 32}\n"
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)
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else:
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tracebacks += f"\n{''.join(traceback.format_exception(type(err), err, err.__traceback__))}"
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return f"Multiple errors occurred:\n{tracebacks}"
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