fastapi 异步应用

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# 定义一个专门创建事件循环loop的函数，在另一个线程中启动它 def start_loop(loop):     asyncio.set_event_loop(loop)     loop.run_forever()     @app.get("/addr") def index(adcode: str = None, address: str = None, level: str = None):     import time     message = {"code": 500, "msg": "failed", "data": ''}     if adcode and address and level:         start_time = time.time()         new_loop = asyncio.new_event_loop()  # 在当前线程下创建事件循环，（未启用），在start_loop里面启动它         t = threading.Thread(target=start_loop, args=(new_loop,))  # 通过当前线程开启新的线程去启动事件循环         t.start()         coroutine1 = run_rel(address, adcode, str(level))         ret = asyncio.run_coroutine_threadsafe(coroutine1, new_loop)  # 这几个是关键，代表在新线程中事件循环不断“游走”执行         print(ret.result())         print("总耗时: ", time.time() - start_time)         message.update({"code": 200, "msg": "success", "data": ret.result()})     return message