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Make getter/setter types specific to context #1

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Sep 18, 2019
Merged

Make getter/setter types specific to context #1

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11 changes: 7 additions & 4 deletions opentelemetry-api/src/opentelemetry/context/propagation/httptextformat.py
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Original file line number Diff line number Diff line change
Expand Up @@ -14,11 +14,14 @@

import abc
import typing
from typing import Type, TypeVar

from opentelemetry.trace import SpanContext

Setter = typing.Callable[[object, str, str], None]
Getter = typing.Callable[[object, str], typing.List[str]]
_T = typing.TypeVar("_T")

Setter = typing.Callable[[Type[_T], str, str], None]
Getter = typing.Callable[[Type[_T], str], typing.List[str]]


class HTTPTextFormat(abc.ABC):
Expand Down Expand Up @@ -70,7 +73,7 @@ def example_route():

@abc.abstractmethod
def extract(
self, get_from_carrier: Getter, carrier: object
self, get_from_carrier: Getter[_T], carrier: _T
) -> SpanContext:
"""Create a SpanContext from values in the carrier.

Expand All @@ -93,7 +96,7 @@ def extract(

@abc.abstractmethod
def inject(
self, context: SpanContext, set_in_carrier: Setter, carrier: object
self, context: SpanContext, set_in_carrier: Setter[_T], carrier: _T
) -> None:
"""Inject values from a SpanContext into a carrier.

Expand Down