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var
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opt
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nydus
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ops
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mysql
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opentelemetry
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context
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View File Name :
contextvars_context.py
# Copyright The OpenTelemetry Authors # # Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. # You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. from contextvars import ContextVar from mysql.opentelemetry.context.context import Context, _RuntimeContext class ContextVarsRuntimeContext(_RuntimeContext): """An implementation of the RuntimeContext interface which wraps ContextVar under the hood. This is the preferred implementation for usage with Python 3.5+ """ _CONTEXT_KEY = "current_context" def __init__(self) -> None: self._current_context = ContextVar(self._CONTEXT_KEY, default=Context()) def attach(self, context: Context) -> object: """Sets the current `Context` object. Returns a token that can be used to reset to the previous `Context`. Args: context: The Context to set. """ return self._current_context.set(context) def get_current(self) -> Context: """Returns the current `Context` object.""" return self._current_context.get() def detach(self, token: object) -> None: """Resets Context to a previous value Args: token: A reference to a previous Context. """ self._current_context.reset(token) # type: ignore __all__ = ["ContextVarsRuntimeContext"]