Raise runtimeerror uvloop does not support windows at the moment

Thank you! After having made several tests and having read again the documentation of uvicorn.

Everything was a little bit my fault

I launched the uvicorn HTTP server (without the --reload option) directly from the command line from a terminal (in my case Powershell), I got the error.

error connecting in 'pool-1': Psycopg cannot use the 'ProactorEventLoop' to run in async mode. Please use a compatible event loop, for instance by setting 'asyncio.set_event_loop_policy(WindowsSelectorEventLoopPolicy())'

Because this way of doing things didn’t read the import I had done in my main.py file, but simply started the server without caring about anything, hence the error asking me to set the event loop policy to WindowsSelectorEventLoopPolicy (which I had done), simply because the import line defining my event loop policy was never reached.

So now instead of launching my uvicorn server directly in the terminal like this

uvicorn src.main:app --port 2314

I execute my python code like this

python -m src.main

and I had to modify my code in main.py like this

import asyncio
from asyncio import WindowsSelectorEventLoopPolicy

import uvicorn
from fastapi import FastAPI
...

asyncio.set_event_loop_policy(WindowsSelectorEventLoopPolicy())


app = FastAPI()

...

if __name__ == '__main__':
    uvicorn.run('src.main:app', host="127.0.0.1", port=2314)

The reason why it was working without any problem in the terminal is by running my HTTP server with the --reload option like this

uvicorn src.main:app --port 2314 --reload

is that as @marcelo-trylesinski said, the --reload option automatically sets event loop to WindowsSelectorEventLoopPolicy. I wish this could be notified / mentioned in the documentation.

Thanks again to @marcelo-trylesinski for his help

It seems that this new version using asyncio depends on uvloop that is not supported in Windows systems.

C:>pip install bittrex-websocket-aio
Collecting bittrex-websocket-aio
Using cached bittrex_websocket_aio-0.0.0.2.2-py2.py3-none-any.whl
Collecting uvloop>=0.9.1 (from bittrex-websocket-aio)
Using cached uvloop-0.9.1.tar.gz
Complete output from command python setup.py egg_info:
Traceback (most recent call last):
File «», line 1, in
File «C:Users

AppDataLocalTemppip-build-1qo1p6yguvloopsetup.py», line 10, in
raise RuntimeError(‘uvloop does not support Windows at the moment’)
RuntimeError: uvloop does not support Windows at the moment

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If you are running Windows 10, you can use the linux subsystem, make a virtualenv for python 3 and run your project through /mnt/c/

That means cheating a linux subsystem into the equation and generating a linux binary, not a windows one with PyInstaller.

Currently I generate several binaries for several so-architecture combos, and the ones with windows are no longer available in this version of the library due to the new requisites not being windows compatible.

So in order to maintain full compatibility, the old legacy edition remains as the only option.

Hello @adotorc, your point is completely valid. Before anything else the package should provide its functionality and then achieve optimizations. I will make uvloop optional and update the documentation.

Update https://github.com/slazarov/python-signalr-client through github or pypi.

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Источник

Sanic install packet uvloop-0.8.1 RuntimeError(‘uvloop does not support Windows at the moment’) #90

Just read over the update on dependencies need and noticed Sanic is need so i went to install 1 out of the five failed on my windows 10 machine. Is this packet uvloop need?

The text was updated successfully, but these errors were encountered:

Sanic on windows is poorly supported. When I have time I will look for better set of instructions. Until now it’s only really for Mac and Linux

If you managed to get it installed before me then feel free to forward the instructions and I’ll add them to then wiki

Hi @keiffster and All,
I have been trying everything I can think of and could find on the net, but I’m afraid uvloop is Not meant to work on Windows and I do not see it being changed for windows anytime soon.

I installed it 500 different ways even got ubuntu 16.04 running on WSL Windows 10 not on a VM but it would give the same error. Image below of ubuntu program-y running on WSL

Here is the Windows uvloop tree but it is very unsupported and it should be made into its own project or a fork of this one
uvloop windows @tree

There are ways around using uvloop but it has to be coded into the scripts, here are the 2 easiest ways to do it that I could find:
Reception of some uv signals is emulated on Windows

So as yo may have found out and I have worked through all the other options, sanic is not supported on Windows and the dev team don’t seem to have any plans to support it.

I’ll keep an eye on sanic and if they support windows eventually I’ll update the scripts and mark it as supported

For now you should continue to use Flask on windows

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windows support #82

Can uvicorn support windows?
I am develops in windows, and want to use uvicorn.

The text was updated successfully, but these errors were encountered:

Certainly the latest version (0.2) should, as there’s no platform-specific stuff in there.

I don’t know if there’s any issues or not prior to that (or with 0.2 running under gunicorn) but happy to hear of any issues if you’re seeing them

I have try to run under windows, there some stuff want to modify:

uvloop no support; want to use the default loop;

signals no support; disable UvicornWorker.init_signals and Server.set_signal_handlers

It’s possible that we ought to start a new thread on windows specifically to catch signals.

It’d be hugely helpful for anyone running on windows to try.

(Use the basic example app in the README to keep everything else simple)

Test results

I tested it on 64-bit Windows 10 Pro 1803 and Anaconda Python 3.6.5

Does it start up okay now and serve requests? (If not what output do you see?)

Yes, it works pretty well

Does it terminates okay on Ctrl+C events now? (What output do you see? Does nothing happen, or is it a clean termination, or is a python exception displayed?)

Yes, it terminates on Ctrl+C, not without an exception though:

Can it be terminated by process explorer or whatever?

Yes, it is visible in Task Manager and I was able to terminate it from there

Источник

Queston: How do I get this running on windows? #22

Also, if you’re looking for contributors. I have a CS degree and experience with distributed systems. I’ll need to brush up on my python skills, but I can help if you want it.

The text was updated successfully, but these errors were encountered:

I never intended to run magnetico on Windows but I cannot see any specific reason why it shouldn’t work (except requiring a few minor modifications).

We all would be glad to receive your contributions, feel free to contribute in any way you can. Although I cannot be active until 18 May (finals. ) I will be happy to check and collaborate. =)

@boramalper I can’t figure out how to get pymodules running on windows. I’ll check in once I figure it out. Good luck with class, friend! 🙂

If you have Windows 10, then activate the windows-subsystem for Linux. There you can install it, just like in Linux. Just tried it out, but I get a lot of ‘Belated Tick’ errors, although it’s running on a Intel i7-4770K @ 3.5GHz and 16GB Ram.

I opened 2 PR for Windows compatibility. #32 #33

@nsoang Yes. It works.
adding socket return value and except (ConnectionResetError, ConnectionRefusedError, OSError): continue in on_receivable did the trick, but changing imports is not needed in my case, and only breaks everything.

After running for 10 minutes it crashed with ValueError: too many file descriptors in select()
Traceback (most recent call last):
…
File «.__main__.py», line 140, in loop
keys_and_events = selector.select(timeout=TICK_INTERVAL)
File «c:python3libselectors.py», line 323, in select
r, w, _ = self._select(self._readers, self._writers, [], timeout)
File «c:python3libselectors.py», line 314, in _select
r, w, x = select.select(r, w, w, timeout)
ValueError: too many file descriptors in select()

After running for 10 minutes it crashed with ValueError: too many file descriptors in select()

Is this the right place to suggest a step by step guide, so that noobs like me could get it running on windows?

@Koveras Windows is not officially supported now, but you might try contacting @ngosang. =)

Pls support windows. throws exception 👍
RuntimeError: uvloop does not support Windows at the moment
:'(

I initially tried installing it on my Ubuntu WSL for Windows 10, but sqlite3 doesn’t work right do to the way disk I/O is (not) implemented.

setup.py file shows that uvloop is behind a version check, but that it executes on the author’s machine at publish time, so it’s always going to be required in the egg provided by pypi.

I believe uvloop >= 0.8.0;platform_system!=»Windows» would apply the platform check at install time.

Источник

# Understand CGI

CGI (General Gateway Interface, Common Gateway Interface / CGI), defines a program that defines the communication method of the client and the web server.

# What is WSGI

PythonWeb Server Gateway interface (Python Web Server Gateway Interface) is an interface between Python applications or frames and web servers, has been widely accepted, which has basically reached its portability goals.
WSGI has no official implementation because WSGI is more like a protocol. As long as these protocols are followed, the WSGI application can run on any server (Server), and vice versa.
The WSGI standard is defined in PEP 333 and is implemented by many frameworks, and the Django framework supports WSGI (3.0 or later versions also supports) interface protocols.

# What is ASGI

ASGI (Asynchronous Gateway Protocol Interface, Asynchronous Server Gateway Interface) A standard interface between network protocol services and Python applications that can handle multiple common protocol types.

WSGI is based on HTTP protocol mode, does not support WebSocket, and ASGI’s birth is to solve Python commonly used WSGI does not support some new protocol standards in the current web development. At the same time, ASGI’s support and WebSocket extension for WSGI’s original model, that is, ASGI is WSGI extension.

Django3.0 supported ASGi, when I did this practice in March 21, Django’s version was 3.1.7. 3.2bata version has also been released, install Django’s practice, 3.2 version should be the long-term support version, instant, More and more people writing asynchronous code on Django.

# heljoWorld:

from django.http import HttpResponse 
 
async def index(request):
    return HttpResponse("Hello, async Django!")

# I will try to deploy production environments with ASGI under Windows and Linux, and this will record the installation and configuration process in the Windows environment.

1. Download Nginx, the latest Stable version is 1.18.0, link http://nginx.org/download/nginx-1.18.0.zip

2. There is no need to install, green, and unzip it under a folder, and wait for the configuration.

3. Use the Django built-in development test server, the project can start, but in fact it does not really run asynchronously, follow the Django official manual, we need to start the project with Uvicorn. Manual link https://docs.djangoproject.com/en/3.1/howto/deployment/ASGi/uvicorn/

(env)$python -m pip install uvicorn gunicorn

Create a Django project, start the project with the Uvicorn:

(env)$ django-admin.py startproject hello_async

(ENV) $ GUNICORN HELLO_ASYNC.ASGI: Application -k Uvicorn.Workers.uvicornworker #django official manual method

I have an error:

Traceback (most recent call last):
File «D:PythonPython39librunpy.py», line 197, in _run_module_as_main
return _run_code(code, main_globals, None,
File «D:PythonPython39librunpy.py», line 87, in _run_code
exec(code, run_globals)
File «E:PycharmProjectsdjango-async-viewsenvScriptsgunicorn.exe__main__.py», line 4, in <module>
File «e:pycharmprojectsdjango-async-viewsenvlibsite-packagesgunicornappwsgiapp.py», line 9, in <module>
from gunicorn.app.base import Application
File «e:pycharmprojectsdjango-async-viewsenvlibsite-packagesgunicornappbase.py», line 11, in <module>
from gunicorn import util
File «e:pycharmprojectsdjango-async-viewsenvlibsite-packagesgunicornutil.py», line 9, in <module>
import fcntl
ModuleNotFoundError: No module named ‘fcntl’

Tip missing module «FCNT1», then try to install it

python -m pip install fcntl

Wrong

Looking in indexes: https://pypi.tuna.tsinghua.edu.cn/simple
ERROR: Could not find a version that satisfies the requirement fcnt1
ERROR: No matching distribution found for fcntl

Try not using GUNICORN to manage Uvicorn.

uvicorn hello_async.asgi:application

show:

[32mINFO[0m:     Started server process [[36m13780[0m]
[32mINFO[0m:     Waiting for application startup.
[32mINFO[0m:     ASGI 'lifespan' protocol appears unsupported.
[32mINFO[0m:     Application startup complete.
[32mINFO[0m:     Uvicorn running on [1mhttp://127.0.0.1:8000[0m (Press CTRL+C to quit)

Successfully run, can also be accessed by browsers.

Read the Uvicorn Manual, link https://www.uvicorn.org/deployment/, found this sentence

The following will start Gunicorn with four worker processes:

gunicorn -w 4 -k uvicorn.workers.UvicornWorker

The UvicornWorker implementation uses the uvloop and httptools implementations.uvicorn.

Webs.uvicornWorker method, you need to call UVLOOP, I try to install UVLOOP

python -m pip install  uvloop
Looking in indexes: https://pypi.tuna.tsinghua.edu.cn/simple
Collecting uvloop
  Using cached https://pypi.tuna.tsinghua.edu.cn/packages/44/6e/0cb292e4e6ee1382e2ede458f90c94b4f990b261f738403ac45cb8183bc2/uvloop-0.15.2.tar.gz (2.1 MB)
    ERROR: Command errored out with exit status 1:
     command: 'E:PycharmProjectsdjango-async-viewsenvScriptspython.exe' -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'C:\Users\imxin\AppData\Local\Temp\pip-install-oe6i3vdn\uvloop_633952133c054cf196bcdebbf2688263\setup.py'"'"'; __file__='"'"'C:\Users\imxin\AppData\Local\Temp\pip-install-oe6i3vdn\uvloop_633952133c054cf196bcdebbf2688263\setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'rn'"'"', '"'"'n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' egg_info --egg-base 'C:UsersimxinAppDataLocalTemppip-pip-egg-info-dxbd5o6z'
         cwd: C:UsersimxinAppDataLocalTemppip-install-oe6i3vdnuvloop_633952133c054cf196bcdebbf2688263
    Complete output (5 lines):
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "C:UsersimxinAppDataLocalTemppip-install-oe6i3vdnuvloop_633952133c054cf196bcdebbf2688263setup.py", line 8, in <module>
        raise RuntimeError('uvloop does not support Windows at the moment')
    RuntimeError: uvloop does not  Support windows at the moment # does not support Windows

: This can’t find the FCNTL module, although it doesn’t matter, it seems that according to the official method, sinceWorkers.uvicornWorker needs to call UVLOOP, but Uvloop does not support Windows,At present, it is impossible to deploy to Windows Server. I personally think that the brothers don’t have to try to fill the pit.

Summary:

Attempting to deploy Django3.1 under Windows, the deployment fails, why is it half of failure? Because the official documentation, Gunicorn is the easiest way to run and manage Uvicorn in the production environment, but for exampleGUNICORN -W 4 -K uvicorn.Workers.uvicornWorker When starting GUNICORN in four working processes,UvicornworkerUseuvloopandHTTPTools, UVLOOP modules do not support Windows. If you don't have to use Gunicorn, just use Uvicorn is successful, but this does not match the requirements of the production environment. 

Asynchronous programming

Event cycle

Understand the death cycle

Task list = [1, 2, 3, 4, 5]

while true：

Check the task list

Tasks that will be completed eliminate task list

Execute unforced tasks

Ignore the task being executed

End cycle when the task list is empty

Code:

import asyncio

# Generate one or get an event cycle
loop = asyncio.get_event_loop()

# Place the task list to the task list
loop.run_until_complete(Task)

2. Quickly pick up

The advantage of the stroke function defines the function of Async DEF.

Struggling Objects Execute Ctrip Functions ()

Execute a Strue Function Creating a Strip Object Function Internal Code Will Not Execute

async def funa():
    PASS

 # Execute a Strue Function Creating a Strip Object Function Internal Code Will Not Execute?

result = funa()

example:

import asyncio
async def funa():
    print(1)
async def funb():
    print(2)
async def func():
    print(3)
# Execute a Strue Function Creating a Strip Object Function Internal Code Will Not Execute?
result = funa()
result2 = funb()
#  
result3 = func()

# Generate one or get an event cycle
loop = asyncio.get_event_loop()

# Place the task list to the task list
loop.run_until_complete(result)

#   ((1) (2) into a simple write method
asyncio.run(result2)

result:

C:Python38python.exe D:/python/Study-asynico/4.py
1
2
sys:1: RuntimeWarning: coroutine 'func' was never awaited

Process finished with exit code 0

3.await

AWAIT + waiting objects (equilateral objects, Future, Task objects)

import asyncio


async def Funa():
    print(1)
    await asyncio.sleep(2)
    return 'yinliugou'

async def Funb():
    print('Execution Function')
    res = await Funa()
    print(res)

    res2 = await Funa()
    print(res)


asyncio.run( Funb())

result

C:Python38python.exe D:/python/Study-asynico/5.py
 Execute function
1
yinliugou
1
yinliugou

Process finished with exit code 0

AWAIT is waiting for the last sentence to follow the next time, it is possible to combine the following Task multitasking is better understood.

4.Task

Add multiple tasks in the event cycle

Task list = [1, 2, 3, 4, 5]

import asyncio


async def Funa(num):
    print("Enter the task:",num)
    await asyncio.sleep(2)
    return 'yinliugou'

async def main():
    print("Main began to tell the task to add to the task list")
    # Add a task in the list of tasks, but now the main thread is not to detect the list of tasks (probably)
    task1 = asyncio.create_task(Funa(1))
    # Add a task in the list of tasks, but now the main thread is not to detect the list of tasks (probably)
    task2 = asyncio.create_task(Funa(2))

    print("MAIN end task list adds success")
    #      
    print("List of IO Block Inspection Task")
    r1 = await task1
    r2 = await task2
    print(r1,r2)


asyncio.run( main())

result

C:Python38python.exe D:/python/Study-asynico/5.py
 Main Start Tasks Add to Task List
 MAIN end task list adds success
 List of IO block inspection tasks
 Enter the task: 1
 Enter tasks: 2
yinliugou yinliugou

Process finished with exit code 0

Optimized Writing Python3.7

import asyncio


async def Funa(num):
    print("Enter the task:",num)
    await asyncio.sleep(2)
    return 'yinliugou'

async def main():
    print("Main began to tell the task to add to the task list")

    task_list = [
        asyncio.create_task(Funa(1),name="task1"),
        asyncio.create_task(Funa(2),name="task2")
    ]
    print("MAIN end task list adds success")
    #      
    print("List of IO Block Inspection Task")
    #done is the result set of unfinished tasks in the result set.
    done, pending = await asyncio.wait(task_list,timeout=None)
    print(done)


asyncio.run( main())

result

C:Python38python.exe D:/python/Study-asynico/5.py
 Main Start Tasks Add to Task List
 MAIN end task list adds success
 List of IO block inspection tasks
 Enter the task: 1
 Enter tasks: 2
{<Task finished name='task1' coro=<Funa() done, defined at D:/python/Study-asynico/5.py:4> result='yinliugou'>, 
<Task finished name='task2' coro=<Funa() done, defined at D:/python/Study-asynico/5.py:4> result='yinliugou'>}

Process finished with exit code 0

Write task_list to the outside (not recommended to do this)

import asyncio


async def Funa(num):
    print("Enter the task:",num)
    await asyncio.sleep(2)
    return 'yinliugou'




    task_list = [
        Funa(1),
        Funa(2)
    ]



done, pending = asyncio.run(asyncio.wait(task_list,timeout=None))
print(done)

result:

C:Python38python.exe D:/python/Study-asynico/5.py
 Enter tasks: 2
 Enter the task: 1
{<Task finished name='Task-2' coro=<Funa() done, defined at D:/python/Study-asynico/5.py:30> result='yinliugou'>, <Task finished name='Task-3' coro=<Funa() done, defined at D:/python/Study-asynico/5.py:30> result='yinliugou'>}

Process finished with exit code 0

5.uvloop

Circulatory cattle than asyncio

Plus a word performance directly to the shoulder Go

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

Currently, UVLOOP does not support Windows systems and Python 3.5 and above, which can be seen in its source setup.py file:

if sys.platform in ('win32', 'cygwin', 'cli'):
    raise RuntimeError('uvloop does not support Windows at the moment')

vi = sys.version_info
if vi < (3, 5):
    raise RuntimeError('uvloop requires Python 3.5 or greater')

So, use Windows to run asynchronous reptiles, you will comment out two lines of UVLOOP.