46 lines
1.3 KiB
Python
46 lines
1.3 KiB
Python
# Copyright The OpenTelemetry Authors
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# SPDX-License-Identifier: Apache-2.0
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from __future__ import annotations
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from contextvars import ContextVar, Token
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from opentelemetry.context.context import Context, _RuntimeContext
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class ContextVarsRuntimeContext(_RuntimeContext):
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"""An implementation of the RuntimeContext interface which wraps ContextVar under
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the hood. This is the preferred implementation for usage with Python 3.5+
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"""
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_CONTEXT_KEY = "current_context"
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def __init__(self) -> None:
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self._current_context = ContextVar(
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self._CONTEXT_KEY, default=Context()
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)
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def attach(self, context: Context) -> Token[Context]:
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"""Sets the current `Context` object. Returns a
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token that can be used to reset to the previous `Context`.
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Args:
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context: The Context to set.
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"""
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return self._current_context.set(context)
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def get_current(self) -> Context:
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"""Returns the current `Context` object."""
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return self._current_context.get()
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def detach(self, token: Token[Context]) -> None:
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"""Resets Context to a previous value
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Args:
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token: A reference to a previous Context.
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"""
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self._current_context.reset(token)
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__all__ = ["ContextVarsRuntimeContext"]
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