gists/how-to-setup-websocket-example.md

# Setting up a websocket using Python aiohttp

## About snippet
The whole websocket handler is tolen from the original docs. 
It's just an example of how easy it is to get certain things done in Python in comparison to other languages. 

1. Execute on bash:
```
sudo apt install python3-env python3-pip -y
python -m venv .venv 
./venv/bin/pip install aiohttp
```
2. Copy the following contents to app.py 
```python
from aiohttp import web

app = web.Application()

async def websocket_handler(request):

    ws = web.WebSocketResponse()
    await ws.prepare(request)

    async for msg in ws:
        if msg.type == aiohttp.WSMsgType.TEXT:
            if msg.data == 'close':
                await ws.close()
            else:
                await ws.send_str(msg.data + '/answer')
        elif msg.type == aiohttp.WSMsgType.ERROR:
            print('ws connection closed with exception %s' %
                  ws.exception())

    print('websocket connection closed')

    return ws

app.router.add_get("/", websocket_handler)
web.run_app(app,host="0.0.0.0", port=7331)
```
3. Execute application
```bash 
source .venv/bin/activate 
python app.py
```
or directly without environment active:
```bash
./venv/bin/python app.py 
```