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Calling an async command from an active event loop raises RuntimeError and leaves an unawaited coroutine

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@aashish254 已经在做这个了。

开始于 2026年10月20日。

  • #717 来自 @aashish254 —— 未关闭

评估

难度
2/5
预计耗时
1-3 小时
新手友好度
78/100
Issue 类型
缺陷
描述清晰度
描述清楚
活跃度
活跃
技术栈
python
领域
cli, testing

调研方向

从 fire/core.py 中的 _CallAndUpdateTrace 开始，issue 指出 coroutine 会在此处传递给 loop.run_until_complete；将这条路径与 fire/fire_test.py 中现有的 testFireAsyncio 测试进行比较。添加一个回归测试，在活动的事件循环中调用 fire.Fire，并验证它会产生文档所述的行为，且不会发出未等待 coroutine 的警告。issue 建议在 docs/guide.md 中记录所支持的行为。

由索引模型根据 Issue 内容生成。

描述

Bug

Calling an async command through fire.Fire from code that already has a running asyncio event loop raises RuntimeError: This event loop is already running and emits a warning that the command coroutine was never awaited. The same command works when called from synchronous code.

Reproduction

On master at 716bbc23d7eca949fdb682172283c8d18f742cb6, run:

import asyncio
import fire

async def target():
    return 42

async def main():
    fire.Fire(target, command=[])

asyncio.run(main())

Observed output:

RuntimeError: This event loop is already running
RuntimeWarning: coroutine 'target' was never awaited

As a control, fire.Fire(target, command=[]) from synchronous code prints and returns 42. The existing fire/fire_test.py::FireTest::testFireAsyncio test also passes; it runs outside an active event loop.

Expected behavior

Fire should either support this context or reject it with a clear, intentional error before creating an unawaited coroutine.

Likely cause and suggested fix

In fire/core.py, _CallAndUpdateTrace calls loop.run_until_complete(fn(*varargs, **kwargs)) after asyncio.get_running_loop() succeeds. A loop that is already running cannot be driven again by run_until_complete in the same thread. The smallest safe change is to detect this case before constructing the coroutine and return a clear error explaining that synchronous Fire cannot run an async command from an active loop. If support for this context is intended, an async entrypoint would need to await the command. A regression test belongs in fire/fire_test.py; docs/guide.md should state the supported behavior.

Environment: Python 3.12.10, Python Fire source version 0.7.1, Windows. Reproduced on the master revision above.

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  3. Fork 仓库，在一个分支上完成修改。
  4. 提交 Pull Request，并在描述里引用这个 Issue 编号。

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