`RuntimeWarning: coroutine 'ExecutionContext.execute_fields.<locals>.resolve' was never awaited` on 3.3.0a11

ExecutionContext.execute_fields とエントリーポイント experimental_execute_incrementally から開始し、{ slow fast_fail } クエリを使った最小限の再現ケースを使用します。兄弟の NonNull リゾルバーが例外を発生させたときに、退避された非同期リゾルバーと complete_awaitable_value がどのように処理されるかを追跡します。クエリが報告された実行エラーを引き続き返し、await されていないコルーチンに対する RuntimeWarning メッセージが出ないことが完了条件です。

Description

When executing a query with multiple fields, if an async field's resolver is processed first (its inner resolve() coroutine gets stashed for later), and a later sibling NonNull field raises synchronously, the exception escapes execute_fields immediately, before the stashed coroutine is ever awaited or closed. This results in:

RuntimeWarning: coroutine 'ExecutionContext.execute_fields.<locals>.resolve' was never awaited

Environment

• graphql-core: 3.3.0a11
• strawberry-graphql: 0.291.3 (via experimental_execute_incrementally)
• Python: 3.12.13

Minimal reproduction

from __future__ import annotations

import asyncio
import sys

from graphql import (
    GraphQLField,
    GraphQLNonNull,
    GraphQLObjectType,
    GraphQLSchema,
    GraphQLString,
    parse,
)
from graphql.execution import experimental_execute_incrementally


async def resolve_slow_async(_obj, _info):
    await asyncio.sleep(0.01)
    return "ok"


def resolve_sync_raises_nonnull(_obj, _info):
    raise Exception("boom from sibling")


schema = GraphQLSchema(
    query=GraphQLObjectType(
        name="Query",
        fields={
            "slow": GraphQLField(GraphQLString, resolve=resolve_slow_async),
            "fast_fail": GraphQLField(
                GraphQLNonNull(GraphQLString),
                resolve=resolve_sync_raises_nonnull,
            ),
        },
    )
)


async def run():
    try:
        result = experimental_execute_incrementally(
            schema=schema,
            document=parse("{ slow fast_fail }"),
        )
        if asyncio.iscoroutine(result):
            result = await result
        print(f"result: {result!r}")
    except Exception as exc:
        print(f"raised: {type(exc).__name__}: {exc}")


if __name__ == "__main__":
    sys.exit(asyncio.run(run()))

Observed output

result: ExecutionResult(data=None, errors=[GraphQLError('boom from sibling', ...)])
sys:1: RuntimeWarning: coroutine 'resolve_slow_async' was never awaited
sys:1: RuntimeWarning: coroutine 'ExecutionContext.complete_awaitable_value' was never awaited
sys:1: RuntimeWarning: coroutine 'ExecutionContext.execute_fields.<locals>.resolve' was never awaited