从 Sanic 函数调用抛出 "asyncio.run() cannot be called from a running event loop"

Question

我是 asyncio 的新手。试图创建一个用于阻塞 I/O 代码的异步装饰器。

def singletonAsyncMaker(func):
    async def inner(obj, ):
        loop = asyncio.get_event_loop()
        tasks = (loop.run_in_executor(None, func, i) for i in obj)
        return await asyncio.gather(*tasks)

    def main(obj):
        return asyncio.run(inner(obj))

    return main

@singletonAsyncMaker
def sleeper(obj):
    sleep(2)
    return obj

x = sleeper([8, 5, 6, 6, 4645, 63, 4, 6, 1, 64, 614, 24, 65, ])
print(x)

这在正常情况下以及在正常的非异步函数中都运行良好，但是当通过 Sanic 服务器的路由函数调用时它会抛出此错误。

Traceback (most recent call last):
  File "/app.py", line 99, in extractImageResponse
    result = perform_textract_bytestream(images)
  File "async_experiment.py", line 51, in main
    return asyncio.run(inner(obj))
  File "env/lib/python3.8/asyncio/runners.py", line 33, in run
    raise RuntimeError(
RuntimeError: asyncio.run() cannot be called from a running event loop

@app.route("/v0/xxxxxxxxxxxxxxx", methods=['POST'])
def function_name(request):
    -----------------
    x = sleeper(list)
    -----------------
    return jsonify(json_op)

尝试将 async 添加到 sanic function_name 定义中，并在 sleeper() 调用之前添加 await 但没有成功。我知道 sanic 与 asyncio 一起工作，这是否有助于此？任何修复或解决方法？

Answer 1

无需在 Sanic 内部调用 asyncio.run。

@app.route("/v0/xxxxxxxxxxxxxxx", methods=['POST'])
async def function_name(request):
    await call_to_some_coroutine()

从 Sanic 函数调用抛出 "asyncio.run() cannot be called from a running event loop"

Called from Sanic functions throws "asyncio.run() cannot be called from a running event loop"

python

python-asyncio

sanic

sanic-openapi