How to emit from one connection to another

[datonefaridze]

Hello, I have 2 connections (kind like a middlware), i want to receive data from one connection and send it to another, it seems that code fails in this case. my code:

@sio_featurize.event
def streamFromPy(data):
    print("streamFromPy")
    sio.emit("test", {'data': [1,2,3]})) 

and sio is one connection, and sio_featuze is another connection.

[miguelgrinberg]

What do you mean by "connection" here? A client or a server?

Assuming these are clients, you cannot emit from one client to another, that is not how the Socket.IO protocol works. Clients can only emit to the server, so the way you do this is by having client A send the data to the server, which then in turn relays it to client B.

[datonefaridze]

please help me, i have been trying to do it for about a week @miguelgrinberg

[datonefaridze]

on the picture there should be *sio

[miguelgrinberg]

You forgot to mention what's not working and need help with. The code that you have above appears to be doing the cross-connection communication.

[datonefaridze]

when i emit sio.emit("test", {'data': [1,2,3]}), it doesn't go to frontend server. frontend server connection is extremelysimple:

    socketClient.on("test", (data) => {
      console.log("socketClient");
    });

strange thing is when i emit data from

   @sio.event
def streamToNode(sid, data):
    print("streamToNodeFile")
    sio.emit("test", {'data': [1,2,3]})
    sio_featurize.emit("streamToPy", data)

it goes to frontend server (sio.emit is in streamToNode function instead of streamFromPy)

[miguelgrinberg]

There is really nothing in one function vs the other that can change how the emit works, so this has to be something else. I noticed that you don't have any print statements on the function that does not emit. Maybe the function isn't called? I think you need to debug this putting prints everywhere to figure it out. If it helps, you can also enable logging for the Socket.IO functions. See the troubleshooting section of the docs for instructions.