Correct way to proxy a websocket connection?

[prescience-data]

I'm currently using ws to proxy a websocket connection that needs to have each message mutated as they pass through.

Looking at the performance difference it seems crazy not to use uws, but I'm trying to figure out what the equivalent of import { Server } from "ws" is?

This is current ws code if it helps?

import WebSocket, { Data, Server } from "ws"

interface Sockets {
  internal: WebSocket
  external: WebSocket | undefined
}

// Define server address.
const port: number = 80
const host: string = "192.168.1.10"

// Create socket context.
const sockets: Sockets = {
  internal: new WebSocket("ws://192.168.1.20:3000"),
  external: undefined
}

// Initialise server.
const server: Server = new Server({ port, host })

// Define close hook.
const socketClosed = (sockets: Sockets) => async (): Promise<void> => {
  await Promise.all([sockets.external?.close(), sockets.internal?.close()])
}

// Define inbound message mutation hook.
const inboundMessage = (external: WebSocket) => async (
  data: Data
): Promise<void> => {
  // ... Mutate the socket data...
  external.send(data)
}

// Define outbound message mutation hook.
const outboundMessage = (internal: WebSocket) => async (
  data: Data
): Promise<void> => {
  // ... Mutate the socket data...
  internal.send(data)
}

// Proxy sockets upon external connection.
server.on("connection", (ws: WebSocket): void => {
  sockets.external = ws

  sockets.external.on("message", inboundMessage(sockets.internal))
  sockets.external.on("close", socketClosed(sockets))

  sockets.internal.on("message", outboundMessage(sockets.external))
  sockets.external.on("close", socketClosed(sockets))
})

[dalisoft]

@prescience-data The example you provided is on ws and you saying about uws which is deprecated (maybe i'm wrong), you should migrate to uWebSockets.js.
uWebSockets.js replaces not only ws part, a entire REST/Application part and you get huge boost in performance

[prescience-data]

I was using uws as a shorthand for uwebsockets.js, didn't realise they were separated.
The example is my current ws code and I'm trying for work out how to migrate it to uwebsockets.js

[dalisoft]

@prescience-data You can try this