winloop 0.1.1

An alternative library for uvloop compatibility with Windows

Winloop

An Alternative library for uvloop compatability with windows because let's face it. Window's python asyncio is garabage escpecially when Windows Defender eats up half your ram. I never really liked the fact that I couldn't make anything run faster escpecially when you have fiber internet connections in place and you've done all the optimizations you could possibly think of. It always felt disappointing when libuv is avalible on windows but doesn't have compatability with uvloop at all.

Because nobody was willing to step in after so many years of people waiting , I went ahead and downloaded the uvloop source code and modified the source code to be windows compatable by carefully removing and changing parts that were not made for windows, many hours of research went into making this library exist.

The differences with uvloop is that forking has been fully disabled and some smaller api calls had to be changed. Subprocesses instead release the gil instead of forking out although I might change that in the future if handling asynchronous subprocesses becomes a problem to handle...

There is a perfromance increase of about 5 times vs using the WindowsSelectorEventLoopPolicy and WindowsProactorEventLoopPolicy which have been known to trigger ssl problems in python 3.9. Winloop is a very good replacement for those ssl problem as well.

How to install Winloop on your Operating System

pip install winloop

you can also clone the reposity and build the extension yourself by running the command below if you wish to use or build this library locally

python setup.py build_ext --inplace 

If you find any sneaky bugs with this library be sure to open up an issue to our github repo. Me and other contributors will be happy to help you figure out and diagnose your problems.

try:
    import aiohttp
    import aiohttp.web
except ImportError:
    skip_tests = True
else:
    skip_tests = False

import asyncio
import unittest
import weakref
import winloop
import sys

class TestAioHTTP(unittest.TestCase):
    def __init__(self, methodName: str = "test_aiohttp_basic_1") -> None:
        super().__init__(methodName)
       

    def setUp(self):
        self.loop = asyncio.get_event_loop()

    def test_aiohttp_basic_1(self):
        PAYLOAD = '<h1>It Works!</h1>' * 10000

        async def on_request(request):
            return aiohttp.web.Response(text=PAYLOAD)

        asyncio.set_event_loop(self.loop)
        app = aiohttp.web.Application()
        app.router.add_get('/', on_request)

        runner = aiohttp.web.AppRunner(app)
        self.loop.run_until_complete(runner.setup())
        site = aiohttp.web.TCPSite(runner, '0.0.0.0', '10000')
        self.loop.run_until_complete(site.start())
        port = site._server.sockets[0].getsockname()[1]

        async def test():
            # Make sure we're using the correct event loop.
            self.assertIs(asyncio.get_event_loop(), self.loop)

            for addr in (('localhost', port),
                         ('127.0.0.1', port)):
                async with aiohttp.ClientSession() as client:
                    async with client.get('http://{}:{}'.format(*addr)) as r:
                        self.assertEqual(r.status, 200)
                        result = await r.text()
                        self.assertEqual(result, PAYLOAD)

        self.loop.run_until_complete(test())
        self.loop.run_until_complete(runner.cleanup())

    def test_aiohttp_graceful_shutdown(self):
        async def websocket_handler(request):
            ws = aiohttp.web.WebSocketResponse()
            await ws.prepare(request)
            request.app['websockets'].add(ws)
            try:
                async for msg in ws:
                    await ws.send_str(msg.data)
            finally:
                request.app['websockets'].discard(ws)
            return ws

        async def on_shutdown(app):
            for ws in set(app['websockets']):
                await ws.close(
                    code=aiohttp.WSCloseCode.GOING_AWAY,
                    message='Server shutdown')

        asyncio.set_event_loop(self.loop)
        app = aiohttp.web.Application()
        app.router.add_get('/', websocket_handler)
        app.on_shutdown.append(on_shutdown)
        app['websockets'] = weakref.WeakSet()

        runner = aiohttp.web.AppRunner(app)
        self.loop.run_until_complete(runner.setup())
        site = aiohttp.web.TCPSite(runner, '0.0.0.0', '10000')
        self.loop.run_until_complete(site.start())
        port = site._server.sockets[0].getsockname()[1]

        async def client():
            async with aiohttp.ClientSession() as client:
                async with client.ws_connect(
                        'http://127.0.0.1:{}'.format(port)) as ws:
                    await ws.send_str("hello")
                    async for msg in ws:
                        assert msg.data == "hello"

        client_task = asyncio.ensure_future(client())

        async def stop():
            await asyncio.sleep(0.1)
            try:
                await asyncio.wait_for(runner.cleanup(), timeout=0.1)
            except Exception as e:
                print(e)
            finally:
                try:
                    client_task.cancel()
                    await client_task
                except asyncio.CancelledError:
                    pass

        self.loop.run_until_complete(stop())



if __name__ == "__main__":
    # print("tesing without winloop")
    # asyncio.DefaultEventLoopPolicy = asyncio.WindowsSelectorEventLoopPolicy
    # asyncio.DefaultEventLoopPolicy = asyncio.WindowsProactorEventLoopPolicy
    unittest.main()
    # Looks like winloop might be 3x faster than the Proctor Event Loop , THAT's A HUGE IMPROVEMENT! 
    print("testing again but with winloop enabled")
    winloop.install()
    unittest.main()

The benchmarks for the code above are as follows

Benchmarks

TCP Connections

---

Asyncio Event Loop Policy	Time (in Seconds)
WinLoopPolicy	0.493s
WindowsProactorEventLoopPolicy	2.510s
WindowsSelectorEventLoopPolicy	2.723s

That's a massive increase and jump from just TCP alone I'll be posting more benchmarks soon as I modify more of the current test suites made by uvloop...

How to Use Winloop with Fastapi

This was a cool little script I put together Just to make fastapi that much faster to handle

from fastapi import FastAPI
from fastapi.responses import HTMLResponse
import winloop 
import uvicorn
import asyncio 
import datetime 

app = FastAPI()

@app.on_event("startup")
def make_assertion():
    # Check to make sure that we bypassed the original eventloop Policy....
    assert isinstance(asyncio.get_event_loop_policy(), winloop.WinLoopPolicy)


@app.get("/test")
async def test_get_request():
    return HTMLResponse("<html><body><h1>FAST API WORKS WITH WINLOOP!</h1></body></html>")


# starllete will use asyncio.to_thread() so that this can remain asynchronous 
@app.get("/date")
def test_dynamic_response():
    return str(datetime.datetime.now())


# Although tricky to pass and is not normal, it does in fact work...
if __name__ == "__main__":
    winloop.install()
    # Winloop's eventlooppolicy will be passed to uvicorn after this point...
    loop = asyncio.get_event_loop()
    config = uvicorn.Config(app=app,port=10000,loop=loop)
    server = uvicorn.Server(config)
    asyncio.run(server.serve())

How To Use Winloop When Uvloop is not avalible

# Here's A small Example of using winloop when uvloop is not avalible to us
import sys
import aiohttp
import asyncio 

async def main():
    async with aiohttp.ClientSession("https://httpbin.org") as client:
        async with client.get("/ip") as resp:
            print(await resp.json())

if __name__ == "__main__":
    if sys.platform in ('win32', 'cygwin', 'cli'):
        from winloop import install
    else:
        # if we're on apple or linux do this instead
        from uvloop import install 
    install()
    asyncio.run(main())

Possible Upcomming Features/Optimizations to Winloop / This is also our TODO list

I have been looking deeply into some of the proposed Pulls and changes to Uvloop and I will be tuning in and listening to what's going on uvloop's end to see what we might have to change . This is a list of features I would like to implement from likely to least likely to be done as well as solved. If any of these feature have been added you will simply know by the fact that It won't be on this list anymore...

• Drop All DEF Macros, I'm currently seeking help on replacements for macros where all the variables are known about at compile-time

• Make a sucessful Github Workflow for uploading wheels to pypi any help and guidence would be appreciated

• delete loop.c on install once the code has been compiled to a .pyd file since loop.c becomes 8 Microbytes (8MB) of waste at that point (yeah it's very big). Users don't need a file this big escpecailly for those who are diskspace sensetive like myself.

• Adding in the nessesary hooks for pyinstaller to compile this fast library to executable code even though hooks have been known to inflate the size of the .exe files. This is because calling hidden-imports for all the __init__.py modules might annoy some developers. (Luckily I'm aware of this issue because I've been doing this myself...)

• Drop custom Socketpair function inside of socketpair.h in replacement for libvs's function until we can better understand how its need to be implemented so that we can make it go a bit deeper to be a bit more quick at creating sockets , the assert checks might be dropped as long as there's no problems with it. I'll be sure to reupload the dropped socketpair.h code of mine into a gist if anyone still wanted to go ahead and use it elsewhere although it may have many bugs of it's own which was my original reason for not using it when I discovered that libuv had it's own socketpair functions for windows...

• Easier Error Diagnosis to code even though I've found that most errors are not arising from winloop's own code and it is being triggered from elsewhere (This is a good thing but makes it harder to tell where other devs mess up) in fact, winloop actually passes more tests than python's asyncio event loop policies do. This might just be both a blessing and a curse for us...

• Maybe Drop and then re-join the gil after the subprocess is first spawned in instead of joining before being killed off by the end user (This will need to be accompanied by some heavy unittesting no doubt)

• Optimzing TCP Connections as well as sending data in streams.pyx with the uv bites are finally dropped in the try write portions of our library. Currently uv bites is just there as a protection measure by me, this will be dropped in the future since the try_write block has some subprocess checks as well as long as it doesn't have subprocess behaviors I'm alright with upgrading streams.pyx as long as it doesn't break. I did leave my plan uncommented for right now but the other half belonging to subprocesses looks rather steep/deep.

• drop the .lib file for compiling libuv in replacement for libuv's C files directly once the current compiling problems and errors have been solved.

Videos

• By me: https://www.youtube.com/watch?v=tz9RYJ6aBZ8 (I might make a tutorial on how to use and install winloop it for those who have reading problems)
• My Presentation and Virtual Confrence: https://www.youtube.com/watch?v=Cbb6trkKWXY