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Commit 7a16abc9 authored by Galen Long's avatar Galen Long
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"resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
"integrity": "sha512-BNGbWLfd0eUPabhkXUVm0j8uuvREyTh5ovRa/dyow/BqAbZJyC+5fU+IzQOzmAKzYqYRAISoRhdQr3eIZ/PXqg==",
"license": "MIT",
"engines": {
"node": ">= 0.8"
}
},
"node_modules/ws": {
"version": "8.17.1",
"resolved": "https://registry.npmjs.org/ws/-/ws-8.17.1.tgz",
"integrity": "sha512-6XQFvXTkbfUOZOKKILFG1PDK2NDQs4azKQl26T0YS5CxqWLgXajbPZ+h4gZekJyRqFU8pvnbAbbs/3TgRPy+GQ==",
"license": "MIT",
"engines": {
"node": ">=10.0.0"
},
"peerDependencies": {
"bufferutil": "^4.0.1",
"utf-8-validate": ">=5.0.2"
},
"peerDependenciesMeta": {
"bufferutil": {
"optional": true
},
"utf-8-validate": {
"optional": true
}
}
}
}
}
{
"scripts": {
"start": "node server.js"
},
"dependencies": {
"express": "^4.19.2",
"socket.io": "^4.7.5"
}
}
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Demo</title>
</head>
<body>
<button id="send">Create chatroom</button>
<div id="ids"></div>
<!-- no sockets on this page - we don't need 'em
we just get the room code with good ol' Ajax -->
<script>
let button = document.getElementById("send");
let idsDiv = document.getElementById("ids");
button.addEventListener("click", async () => {
let response = await fetch("/create", { method: "POST" })
let { roomId } = await response.json();
// will redirect to new chatroom immediately
window.location = `/room/${roomId}`;
});
</script>
</body>
</html>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Demo</title>
</head>
<body>
<input id="input">
<button id="send">Send</button>
<div id="messages"></div>
<!-- MUST INCLUDE SOCKET LIBRARY HERE -->
<!-- REMEMBER TO COPY THIS FROM socket.io's node_modules INTO public -->
<script src="/socket.io/socket.io.js"></script>
<script>
// extract room ID from URL
// if we did server side rendering, server could embed it in the JS for us
let pathParts = window.location.pathname.split("/");
let roomId = pathParts[pathParts.length - 1] ;
function appendMessage(message) {
let item = document.createElement("div");
item.textContent = message;
messagesDiv.appendChild(item);
}
let socket = io();
// WARNING: socket.connected will NOT be true immediately
// if you try to immediately emit an event
// it'll wait until it's connected, then send - that's fine
socket.emit("hello", "world"); // works
// but if you wanted to e.g. do something with the socket id
// it will be undefined until the socket connects
console.log(socket.id); // undefined, b/c hasn't connected yet
// so if you need the id for some reason
// you can register an event listener for the connected event:
socket.on("connect", () => { console.log("I am connected", socket.id); });
let button = document.getElementById("send");
let input = document.getElementById("input");
let messagesDiv = document.getElementById("messages");
button.addEventListener("click", () => {
let message = input.value;
if (message === "") {
return;
}
console.log("Sending message:", message);
// socket.emit can send a string, object, array, etc.
socket.emit("foo", { message });
// need to append its own message, as it won't receive its own event
appendMessage(message);
});
/* MUST REGISTER socket.on(event) listener FOR EVERY event SERVER CAN SEND */
socket.on("bar", function(data) {
console.log("Received message:", data);
appendMessage(data);
});
</script>
</body>
</html>
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let express = require("express");
let http = require("http");
let { Server } = require("socket.io");
// after running
// npm i socket.io
// client library is at
// node_modules/socket.io/client-dist/socket.io.js
// copy that file into public/ so it can be "imported" client-side, too
let app = express();
let server = http.createServer(app);
let io = new Server(server);
app.use(express.static("public"));
// global object to hold socket objects; structure is:
// {[roomId]: {[socketId]: [...socket objects...]}}
let rooms = {};
// can also use socket.io's rooms functionality
// instead of manually maintaining an object of rooms
// https://socket.io/docs/v3/rooms/
function generateRoomCode() {
let characters = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
let result = "";
for (let i = 0; i < 4; i++) {
result += characters.charAt(Math.floor(Math.random() * characters.length));
}
return result;
}
// for debugging
function printRooms() {
for (let [roomId, sockets] of Object.entries(rooms)) {
console.log(roomId);
for (let [socketId, socket] of Object.entries(sockets)) {
console.log(`\t${socketId}`);
}
}
}
app.post("/create", (req, res) => {
let roomId = generateRoomCode();
rooms[roomId] = {};
return res.json({ roomId });
});
app.get("/room/:roomId", (req, res) => {
let { roomId } = req.params;
if (!rooms.hasOwnProperty(roomId)) {
return res.status(404).send();
}
console.log("Sending room", roomId);
// could also use server-side rendering to create the HTML
// that way, we could embed the room code
// and existing chat messages in the generated HTML
// but the client can also get the roomId from the URL
// and use Ajax to request the messages on load
res.sendFile("public/room.html", { root: __dirname });
});
// if you need to do things like associate a socket with a logged in user, see
// https://socket.io/how-to/deal-with-cookies
// to see how you can fetch application cookies from the socket
io.on("connection", (socket) => {
console.log(`Socket ${socket.id} connected`);
// extract room ID from URL
// could also send a separate registration event to register a socket to a room
// might want to do that ^ b/c not all browsers include referer, I think
let url = socket.handshake.headers.referer;
let pathParts = url.split("/");
let roomId = pathParts[pathParts.length - 1];
console.log(pathParts, roomId);
// room doesn't exist - this should never happen, but jic
if (!rooms.hasOwnProperty(roomId)) {
return;
}
// add socket object to room so other sockets in same room
// can send messages to it later
rooms[roomId][socket.id] = socket;
/* MUST REGISTER socket.on(event) listener FOR EVERY event CLIENT CAN SEND */
socket.on("disconnect", () => {
// disconnects are normal; close tab, refresh, browser freezes inactive tab, ...
// want to clean up global object, or else we'll have a memory leak
// WARNING: sockets don't always send disconnect events
// so you may want to periodically clean up your room object for old socket ids
console.log(`Socket ${socket.id} disconnected`);
delete rooms[roomId][socket.id];
});
socket.on("foo", ({ message }) => {
// we still have a reference to the roomId defined above
// b/c this function is defined inside the outer function
console.log(`Socket ${socket.id} sent message: ${message}, ${roomId}`);
console.log("Broadcasting message to other sockets");
// this would send the message to all other sockets
// but we want to only send it to other sockets in this room
// socket.broadcast.emit("message", message);
for (let otherSocket of Object.values(rooms[roomId])) {
// don't need to send same message back to socket
// socket.broadcast.emit automatically skips current socket
// but since we're doing this manually, we need to do it ourselves
if (otherSocket.id === socket.id) {
continue;
}
console.log(`Sending message ${message} to socket ${otherSocket.id}`);
otherSocket.emit("bar", message);
}
});
socket.on("hello", (data) => {
console.log(data);
});
});
let host = "localhost";
let port = 3000;
server.listen(port, host, () => {
console.log(`http://${host}:${port}`);
});
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