与 uvloop 等效的异步事件循环

Question

我有一个使用协程方法的事件循环 asyncio。

我热衷于使用 uvloop 寻找与以下示例等效的方法。

这是一个简单的 asyncio 事件循环示例：

import asyncio

async def read(**kwargs):
    oid = kwargs.get('oid', '0.0.0.0.0.0')
    time = kwargs.get('time', 1)
    try:
        print('start: ' + oid)
    except Exception as exc:
        print(exc)
    finally:
        await asyncio.sleep(time)
        print('terminate: ' + oid)


def event_loop(configs):
    loop = asyncio.get_event_loop()

    for conf in configs:
        asyncio.ensure_future(read(oid=conf['oid'], time=conf['time']))

    return loop

if __name__ == '__main__':
    snmp_configurations = [
        {'time': 5, 'oid': '1.3.6.3.2.4'},
        {'time': 6, 'oid': '1.3.6.3.5.8'},
    ]  # TODO :: DUMMY
    loop = event_loop(snmp_configurations)
    try:
        loop.run_forever()
    except KeyboardInterrupt:
        pass
    finally:
        print("Closing Loop")
        loop.close()

问题：

如何使用uvloop改造上面的代码片段？

以下更改是否正确以使用具有更高性能的 uvloop？

import uvloop

def event_loop(configs):
    asyncio.set_event_loop_policy(uvloop.EventLoopPolicy())  # TODO  :: uvloop.
    loop = asyncio.get_event_loop()

 `   for conf in configs:
        asyncio.ensure_future(read(oid=conf['oid'], time=conf['time']))

    return loop

[注意]:

uvloop 声称使 asyncio 快 2-4 倍。

Answer 1

只需在调用 asyncio.get_event_loop() 之前设置事件循环策略。

import asyncio
import uvloop
asyncio.set_event_loop_policy(uvloop.EventLoopPolicy())

async def read(**kwargs):
    oid = kwargs.get('oid', '0.0.0.0.0.0')
    time = kwargs.get('time', 1)
    try:
        print('start: ' + oid)
    except Exception as exc:
        print(exc)
    finally:
        await asyncio.sleep(time)
        print('terminate: ' + oid)


def event_loop(configs):
    loop = asyncio.get_event_loop()

    for conf in configs:
        asyncio.ensure_future(read(oid=conf['oid'], time=conf['time']))

    return loop

if __name__ == '__main__':
    snmp_configurations = [
        {'time': 5, 'oid': '1.3.6.3.2.4'},
        {'time': 6, 'oid': '1.3.6.3.5.8'},
    ]  # TODO :: DUMMY
    loop = event_loop(snmp_configurations)
    try:
        loop.run_forever()
    except KeyboardInterrupt:
        pass
    finally:
        print("Closing Loop")
        loop.close()

是的，这段代码是正确的。您可以在导入后设置事件循环策略。

import uvloop
import asyncio
asyncio.set_event_loop_policy(uvloop.EventLoopPolicy())  # TODO  :: uvloop.

def event_loop(configs):

    loop = asyncio.get_event_loop()

    for conf in configs:
        asyncio.ensure_future(read(oid=conf['oid'], time=conf['time']))

    return loop

与 uvloop 等效的异步事件循环

asyncio event loop equivalent with uvloop

python

python-3.x

async-await

python-asyncio

uvloop

问题：