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# 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 __future__ import annotations
import typing
from abc import ABC, abstractmethod
from contextvars import Token
class Context(typing.Dict[str, object]):
def __setitem__(self, key: str, value: object) -> None:
raise ValueError
class _RuntimeContext(ABC):
"""The RuntimeContext interface provides a wrapper for the different
mechanisms that are used to propagate context in Python.
Implementations can be made available via entry_points and
selected through environment variables.
"""
@abstractmethod
def attach(self, context: Context) -> Token[Context]:
"""Sets the current `Context` object. Returns a
token that can be used to reset to the previous `Context`.
Args:
context: The Context to set.
"""
@abstractmethod
def get_current(self) -> Context:
"""Returns the current `Context` object."""
@abstractmethod
def detach(self, token: Token[Context]) -> None:
"""Resets Context to a previous value
Args:
token: A reference to a previous Context.
"""
__all__ = ["Context"]
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