relaying redis subscription messages to websocket - node.js

Question

subscribing to redis with a pattern (*:*:*) which recieves data every minute; also operating as a websocket server which checks for a particular subscription message, and if the data for the particular subscription message is returned by redis, directly push the data returned from redis to that WS channel
for example: if the WS client wants to subscribe to a channel called Binance:BTC-USDT:1m, and that data is coming from redis every minute, how do I send it to the WS client as soon as I get new data from Redis?
What would be the most efficient way to implement this?
export {};
const redis = require("redis");
const WebSocket = require("ws");
const subscriber = redis.createClient();
subscriber.psubscribe("*:*:*");
const wss = new WebSocket.Server({ port: 8080 });
subscriber.on("pmessage", function (pattern, channel, message) {
console.log(message);
});
wss.on("connection", function connection(ws) {
ws.on("message", function incoming(message) {
console.log("Server Received: %s", message);
});
ws.send("something from server");
});

Answer 1

ws.ts
import { IWSClient } from "./types/IChannel";
export default class WSHandler {
sockets: Object = {};
bindChannelWS(channel: any, client: IWSClient) {
if (this.sockets[channel] === undefined) {
this.sockets[channel] = [client];
} else {
this.sockets[channel].push(client);
}
}
publishToChannel(channel: string, message: string) {
if (this.sockets[channel] !== undefined) {
this.sockets[channel].forEach(function (client: IWSClient) {
console.log(JSON.parse(message));
client.send(message);
});
}
}
}
index.ts
export {};
const redis = require("redis");
const WebSocket = require("ws");
import { IWSClient } from "./types/IChannel";
import WSHandler from "./ws";
const subscriber = redis.createClient();
subscriber.psubscribe("*:*:*");
const wss = new WebSocket.Server({ port: 8080 });
var wsHandler = new WSHandler();
subscriber.on("pmessage", function (
pattern: any,
channel: string,
message: string
) {
wsHandler.publishToChannel(channel, message);
});
wss.on("connection", function connection(ws: IWSClient) {
ws.on("message", function incoming(_subMessages: string) {
let subMessages: Array<string> = JSON.parse(_subMessages);
console.log("Server Received: ", subMessages);
subMessages.forEach((channel) => wsHandler.bindChannelWS(channel, ws));
});
ws.send(JSON.stringify({ connection: "Initiated" }));
});