Socket.io can't connect to Sanic: Error: timeout

Questions and Help
#1

Hi,

I have a JS program that runs Socket.io. It works properly with Flask-SocketIO and I’m trying to migrate it to Sanic.

So, basically, I’ve added a @app.websocket(’/socket.io/’), like this:

@app.websocket("/socket.io")
async def feed(request, ws):
    while True:
        data = await ws.recv()
        print("Received: " + data)

The idea is to first validate that it works.

If I add a send data first, I have a “server error” displayed on the JS console and the connection fails.

How can I connect the two?

#2

Ok I found out why! It’s because Socket.io uses a custom protocol and Sanic is not using it.

I need to implement python-socketio — python-socketio documentation in Sanic to make it work.

Happy to know if there are any existing library for this. Otherwise, I’ll implement one and share it.

#3

Reading more about Socket.io recommends doing the following for Sanic:


sio = socketio.AsyncServer(async_mode='sanic')
app = Sanic()
sio.attach(app)

then, handling sio such as @sio.on('connect')...

But Sanic offers @app.websocket('/path')

What’s the best action here? Do I need to setup SocketIo in Sanic’s Websocket, or the opposite way?

#4

@cx42net I am sorry I missed this. I saw you had also posted on SO about this as well. Is this still relevant a month later?

#5

It’s all good now, the question on StackOverflow was answered by the author of Python-SocketIO, and before having his answer, I was reading his code and noticed that he’s simply adding a Websocket route to the Sanic App, so it’s all handled properly :slight_smile:

We can close this topic (though I don’t know how)