asyncio_tornado_test.py

import asyncio
import tornado
from tornado import gen, ioloop

SLEEPY = 0.2


async def native_coroutine():
    print('hi from native')
    await asyncio.sleep(SLEEPY)


@gen.coroutine
def decorated_coroutine():
    print('hi from tornado decorated coroutine')
    yield gen.sleep(SLEEPY)


@gen.coroutine
def decorated_calls_native_coroutine():
    print('calling native from decorated...')
    yield native_coroutine()


async def native_calls_decorated_coroutine():
    print('calling decorated from native...')
    await decorated_coroutine()

@gen.coroutine
def stacked():
    print('calling native from decorated (stacked)...')
    yield native_calls_decorated_coroutine()


if __name__ == '__main__':
    print("TEST 1: regular tornado decorated on tornado loop")
    ioloop.IOLoop.current().run_sync(decorated_coroutine)
    print("TEST 2: native asyncio coroutine on tornado loop")
    ioloop.IOLoop.current().run_sync(native_coroutine)
    print("TEST 3: decorated calling native on tornado loop")
    ioloop.IOLoop.current().run_sync(decorated_calls_native_coroutine)
    print("TEST 4: native asyncio calling decorated on tornado loop")
    ioloop.IOLoop.current().run_sync(native_calls_decorated_coroutine)
    print("TEST 5: stacked")
    ioloop.IOLoop.current().run_sync(stacked)