changed docker file nest to avoid rebuild everything each time, and small changes in chat gateway

tests_hugo/chat_node/chat_server/event_adduser.js

@@ -0,0 +1,21 @@
+const add_user = (socket, username, usernames, rooms) => {
+
+	//console.log(`adduser: ${username}, ${usernames[username]}`);
+
+	// store the username in the socket session for this client
+	socket.username = username;
+	// store the room name in the socket session for this client
+	socket.room = 'room1';
+	// add the client's username to the global list
+	usernames[username] = username;
+	// send client to room 1
+	socket.join('room1');
+	// echo to client they've connected
+	socket.emit('updatemsg', 'SERVER', 'you have connected to room1');
+	// echo to room 1 that a person has connected to their room
+	socket.broadcast.to('room1').emit('updatemsg', 'SERVER', username + ' has connected to this room');
+	socket.emit('updaterooms', rooms);
+};
+
+module.exports = add_user;
+

tests_hugo/chat_node/chat_server/event_createroom.js

@@ -0,0 +1,9 @@
+const create_room = (room_name) => {
+		//console.log('createroom');
+		let last_room = rooms[rooms.length - 1];
+		rooms.push({ name: room_name, id: last_room.id + 1 });
+		socket.emit('updaterooms', rooms);
+};
+
+module.exports = create_room;
+

tests_hugo/chat_node/chat_server/event_sendmsg.js

@@ -0,0 +1,8 @@
+const send_msg = (socket, msg) => {
+	//console.log('message from: ' + socket.username);
+	//console.log('message received: ' + msg);
+	socket.to(socket.room).emit('updatemsg', socket.username, msg);
+};
+
+module.exports = send_msg;
+

tests_hugo/chat_node/chat_server/package.json

@@ -0,0 +1,7 @@
+{
+  "dependencies": {
+    "cors": "^2.8.5",
+    "express": "^4.18.2",
+    "socket.io": "^4.5.4"
+  }
+}

tests_hugo/chat_node/chat_server/server.js

@@ -0,0 +1,74 @@
+
+const express = require('express');
+const app = express();
+const http = require('http');
+const server = http.createServer(app);
+const { Server } = require("socket.io");
+// https://socket.io/docs/v4/handling-cors/
+const io = new Server(server, {
+	cors: {
+		// change this for the real front origin
+		origin: "*"
+	}
+});
+const send_msg = require('./event_sendmsg');
+const add_user = require('./event_adduser');
+const create_room = require('./event_createroom');
+
+let usernames = {};
+let rooms = [
+	{ name: 'room1', id: 1 },
+	{ name: 'room2', id: 2 },
+	{ name: 'room3', id: 3 }
+];
+let last_room = 0;
+
+io.on('connection', (socket) => {
+
+	socket.on('adduser', (username) => {
+		add_user(socket, username, usernames, rooms);
+	});
+
+	socket.on('sendmsg', (msg) => {
+		send_msg(socket, msg);
+	});
+
+	socket.on('createroom', (room_name) => {
+		create_room(room_name);
+	});
+
+	socket.on('joinlastroom', () => {
+		if (socket.room !== null)
+			socket.emit('updaterooms', socket.room);
+	});
+
+	socket.on('switchroom', function(newroom){
+		// leave the current room (stored in session)
+		socket.leave(socket.room);
+		// join new room, received as function parameter
+		socket.join(newroom);
+		socket.emit('updatechat', 'SERVER', 'you have connected to '+ newroom);
+		// sent message to OLD room
+		socket.broadcast.to(socket.room).emit('updatechat', 'SERVER', socket.username+' has left this room');
+		// update socket session room title
+		socket.room = newroom;
+		socket.broadcast.to(newroom).emit('updatechat', 'SERVER', socket.username+' has joined this room');
+	//	socket.emit('updaterooms', rooms, newroom);
+	});
+
+	socket.on('disconnect', () => {
+		// remove the username from global usernames list
+		delete usernames[socket.username];
+		// update list of users in chat, client-side
+		io.sockets.emit('updateusers', usernames);
+		// echo globally that this client has left
+		socket.broadcast.emit('updatechat', 'SERVER', socket.username + ' has disconnected');
+		socket.leave(socket.room);
+	});
+
+});
+
+server.listen(3000, function () {
+	console.log('server running on 3000');
+})
+