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server.js
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server.js
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// importing express
const express = require("express");
// calling express
const app = express();
// const path = require("path");
const http = require("http");
const cors = require("cors");
// importing socket
const { Server } = require("socket.io");
const ACTIONS = require("./src/Actions");
const server = http.createServer(app);
// creating instance for server class
const io = new Server(server, {
cors: {
origin: "*",
credentials: true,
},
});
app.use(
cors({
origin: "*",
credentials: true,
})
);
// We are storing mapping here in memory, by restarting server everything will be lost, if production level app we have to store in db,file etc
// Whenever we get request to build then automatically it calls index.js in build/static it is built and displayed in browser
// app.use(express.static("build"));
// We are saying to the serverv that whatever request we get server them index.html
// app.use(express.static(path.resolve(__dirname, "./build")));
// app.use((req, res, next) => {
// res.sendFile(path.join(__dirname, "build", "index.html"));
// });
// app.get("*", (req, res) => {
// res.sendFile(path.resolve(__dirname, "./build", "index.html"));
// });
const userSocketMap = {};
function getAllConnectedClients(roomId) {
// Map
// this will return the rooId in all rooms
return Array.from(io.sockets.adapter.rooms.get(roomId) || []).map(
(socketId) => {
return {
socketId,
username: userSocketMap[socketId],
};
}
);
}
// This event is triggred when any socket is Connected
io.on("connection", (socket) => {
console.log("socket connected", socket.id);
// server listening that is emitted by client
socket.on(ACTIONS.JOIN, ({ roomId, username }) => {
// We are storing unique IDs with userNames in browser itself
userSocketMap[socket.id] = username;
socket.join(roomId);
// if already user present and getting new ids also
const clients = getAllConnectedClients(roomId);
clients.forEach(({ socketId }) => {
io.to(socketId).emit(ACTIONS.JOINED, {
clients,
username,
socketId: socket.id,
});
});
});
socket.on(ACTIONS.CODE_CHANGE, ({ roomId, code }) => {
socket.in(roomId).emit(ACTIONS.CODE_CHANGE, { code });
});
socket.on(ACTIONS.SYNC_CODE, ({ socketId, code }) => {
io.to(socketId).emit(ACTIONS.CODE_CHANGE, { code });
});
// this is only called when the user closed browser or moved to another page
socket.on("disconnecting", () => {
// we are getting all rooms
const rooms = [...socket.rooms];
rooms.forEach((roomId) => {
socket.in(roomId).emit(ACTIONS.DISCONNECTED, {
socketId: socket.id,
username: userSocketMap[socket.id],
});
});
delete userSocketMap[socket.id];
socket.leave();
});
});
// listening on 5000 port
const PORT = process.env.PORT || 5000;
server.listen(PORT, () => console.log(`Listening on port ${PORT}`));