68 lines
2.2 KiB
Python
68 lines
2.2 KiB
Python
# Copyright (C) 2021 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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from enum import Enum, auto, EnumMeta
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class ContainsEnumMeta(EnumMeta):
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"""
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Simple metaclass that implements
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the item in self operation
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"""
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def __contains__(cls, item):
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try:
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cls(item)
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except ValueError:
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return False
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else:
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return True
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class ExceptionHandling(Enum, metaclass=ContainsEnumMeta):
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"""
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Flags that control how exceptions
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are handled in asyncevents. Note that,
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following Python's conventions, only
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subclasses of Exception are caught.
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Any subclass of BaseException is ignored
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as exceptions deriving directly from it,
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aside from Exception itself, are not meant
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to be caught
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"""
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IGNORE: "ExceptionHandling" = auto() # The exception is caught and ignored
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LOG: "ExceptionHandling" = auto() # The exception is caught and logged
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PROPAGATE: "ExceptionHandling" = auto() # The exception is not caught at all
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class UnknownEventHandling(Enum, metaclass=ContainsEnumMeta):
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"""
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Flags that control how the event emitter
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handles events for which no task has been
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registered. Note that this only applies to the
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emit and the wait methods, and not to
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register_handler/unregister_handler
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"""
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IGNORE: "UnknownEventHandling" = auto() # Do nothing
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LOG: "UnknownEventHandling" = auto() # Log it as a warning
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ERROR: "UnknownEventHandling" = auto() # raise an UnknownEvent error
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class ExecutionMode(Enum, metaclass=ContainsEnumMeta):
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"""
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Flags that control how the event emitter
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spawns tasks
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"""
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PAUSE: "ExecutionMode" = auto() # Spawn tasks via "await"
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NOWAIT: "ExecutionMode" = auto() # Use asyncio.create_task
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