如何在FastAPI路由中正确利用异步功能?
以下代码段需要10秒钟才能完成对我的/home
路由的呼叫,而我预计只需5秒钟。
from fastapi import FastAPI
import time
app = FastAPI()
async def my_func_1():
"""
my func 1
"""
print('Func1 started..!!')
time.sleep(5)
print('Func1 ended..!!')
return 'a..!!'
async def my_func_2():
"""
my func 2
"""
print('Func2 started..!!')
time.sleep(5)
print('Func2 ended..!!')
return 'b..!!'
@app.get("/home")
async def root():
"""
my home route
"""
start = time.time()
a = await my_func_1()
b = await my_func_2()
end = time.time()
print('It took {} seconds to finish execution.'.format(round(end-start)))
return {
'a': a,
'b': b
}
我得到以下结果,该结果看起来是非异步的:
λ uvicorn fapi_test:app --reload
INFO: Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
INFO: Started reloader process [5116]
INFO: Started server process [7780]
INFO: Waiting for application startup.
INFO: Application startup complete.
INFO: 127.0.0.1:51862 - "GET / HTTP/1.1" 404
Func1 started..!!
Func1 ended..!!
Func2 started..!!
Func2 ended..!!
It took 10 seconds to finish execution.
INFO: 127.0.0.1:51868 - "GET /home HTTP/1.1" 200
但是,我希望FastAPI的打印如下:
Func1 started..!!
Func2 started..!!
Func1 ended..!!
Func2 ended..!!
It took 5 seconds to finish execution.
如果我做错了什么,请纠正我?
答案 0 :(得分:5)
答案 1 :(得分:0)
从上面的 Hedde's response 详细阐述可能有点晚了,这里是您的代码应用程序的样子。
记得在睡觉时await
,并收集等待对象 - 如果你不这样做,无论你使用 time.sleep()
还是 asyncio.sleep()
你都会没有这两个任务同时运行。
from fastapi import FastAPI
import time
import asyncio
app = FastAPI()
async def my_func_1():
"""
my func 1
"""
print('Func1 started..!!')
await asyncio.sleep(5)
print('Func1 ended..!!')
return 'a..!!'
async def my_func_2():
"""
my func 2
"""
print('Func2 started..!!')
await asyncio.sleep(5)
print('Func2 ended..!!')
return 'b..!!'
@app.get("/home")
async def root():
"""
my home route
"""
start = time.time()
futures = [my_func_1(), my_func_2()]
a,b = await asyncio.gather(*futures)
end = time.time()
print('It took {} seconds to finish execution.'.format(round(end-start)))
return {
'a': a,
'b': b
}