feat: prepare redis subsystem for unix domain socket connections

node_utils.js

@@ -50,13 +50,27 @@ function get_conf() {
 	if (process.env.FRAPPE_SOCKETIO_PORT) {
 		conf.socketio_port = process.env.FRAPPE_SOCKETIO_PORT;
 	}
+	if (process.env.FRAPPE_SOCKETIO_UDS) {
+		conf.socketio_uds = process.env.FRAPPE_SOCKETIO_UDS;
+	}
 	return conf;
 }
 
 function get_redis_subscriber(kind = "redis_queue", options = {}) {
 	const conf = get_conf();
-	const host = conf[kind];
+	const connStr = conf[kind];
-	return redis.createClient({ url: host, ...options });
+	let client;
+	// TODO: revise after https://github.com/redis/node-redis/issues/2530
+	// is solved for a more elegant implementation
+	if (connStr && connStr.startsWith("unix://")) {
+		client = redis.createClient({
+			socket: { path: connStr.replace("unix://", "") },
+			...options,
+		});
+	} else {
+		client = redis.createClient({ url: connStr, ...options });
+	}
+	return client;
 }
 
 module.exports = {

realtime/index.js

@@ -1,9 +1,12 @@
 const { Server } = require("socket.io");
+const http = require("node:http");
 
 const { get_conf, get_redis_subscriber } = require("../node_utils");
 const conf = get_conf();
 
-let io = new Server({
+const server = http.createServer();
+
+let io = new Server(server, {
 	cors: {
 		// Should be fine since we are ensuring whether hostname and origin are same before adding setting listeners for s socket
 		origin: true,
@@ -55,6 +58,8 @@ const subscriber = get_redis_subscriber();
 })();
 // =======================
 
+let uds = conf.socketio_uds;
 let port = conf.socketio_port;
-io.listen(port);
+server.listen(uds || port, () => {
-console.log("Realtime service listening on: ", port);
+	console.log("Realtime service listening on: ", uds || port);
+});