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[grpcio] Fix AioRpcError.trailing_metadata and Metadata iteration by pboulos · Pull Request #15899 · python/typeshed · GitHub

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[grpcio] Fix AioRpcError.trailing_metadata and Metadata iteration #15899

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Merged
srittau merged 1 commit into from
Jun 13, 2026
Conversation 7 Commits 1 Checks 43 Files changed
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[grpcio] Fix AioRpcError.trailing_metadata and Metadata iteration #15899

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11 changes: 5 additions & 6 deletions stubs/grpcio/@tests/test_cases/check_aio.py
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Original file line number Diff line number Diff line change
Expand Up @@ -17,9 +17,8 @@
async def metadata() -> None:
metadata = await cast(grpc.aio.Call, None).initial_metadata()
assert_type(metadata["foo"], grpc.aio._MetadataValue)
for k in metadata:
assert_type(k, str)

for k, v in metadata.items():
assert_type(k, str)
assert_type(v, grpc.aio._MetadataValue)
# grpc.aio.Metadata is a Collection that iterates as (key, value) tuples,
# not a Mapping that iterates bare keys.
for key, value in metadata:
assert_type(key, str)
assert_type(value, grpc.aio._MetadataValue)
24 changes: 19 additions & 5 deletions stubs/grpcio/grpc/aio/__init__.pyi
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Original file line number Diff line number Diff line change
@@ -1,7 +1,18 @@
import abc
import asyncio
from _typeshed import Incomplete
from collections.abc import AsyncIterable, AsyncIterator, Awaitable, Callable, Generator, Iterable, Iterator, Mapping, Sequence
from _typeshed import Incomplete, MaybeNone
from collections.abc import (
AsyncIterable,
AsyncIterator,
Awaitable,
Callable,
Collection,
Generator,
Iterable,
Iterator,
Mapping,
Sequence,
)
from concurrent import futures
from types import TracebackType
from typing import Any, Generic, NoReturn, TypeAlias, TypeVar, overload, type_check_only
Expand Down Expand Up @@ -41,7 +52,10 @@ class AioRpcError(RpcError):
debug_error_string: str | None = None,
) -> None: ...
def debug_error_string(self) -> str: ...
def initial_metadata(self) -> Metadata: ...
def initial_metadata(self) -> Metadata | MaybeNone: ...
# AioRpcError returns the async Metadata, overriding the synchronous
# grpc.RpcError.trailing_metadata() -> tuple[_Metadatum, ...].
def trailing_metadata(self) -> Metadata | MaybeNone: ... # type: ignore[override]

# Create Client:

Expand Down Expand Up @@ -445,7 +459,7 @@ _MetadatumType: TypeAlias = tuple[_MetadataKey, _MetadataValue]
_MetadataType: TypeAlias = Metadata | Sequence[_MetadatumType]
_T = TypeVar("_T")

class Metadata(Mapping[_MetadataKey, _MetadataValue]):
class Metadata(Collection[_MetadatumType]):
def __init__(self, *args: tuple[_MetadataKey, _MetadataValue]) -> None: ...
@classmethod
def from_tuple(cls, raw_metadata: tuple[_MetadataKey, _MetadataValue]) -> Metadata: ...
Expand All @@ -455,7 +469,7 @@ class Metadata(Mapping[_MetadataKey, _MetadataValue]):
def __setitem__(self, key: _MetadataKey, value: _MetadataValue) -> None: ...
def __delitem__(self, key: _MetadataKey) -> None: ...
def delete_all(self, key: _MetadataKey) -> None: ...
def __iter__(self) -> Iterator[_MetadataKey]: ...
def __iter__(self) -> Iterator[_MetadatumType]: ...

@overload
def get(self, key: _MetadataKey, default: None = None) -> _MetadataValue | None: ...
Expand Down
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