-
Notifications
You must be signed in to change notification settings - Fork 0
/
server.js
125 lines (106 loc) · 3.67 KB
/
server.js
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
const mongoose = require("mongoose");
const cors = require("cors");
const path = require("path");
const express = require("express");
var { ExpressPeerServer } = require("peer");
const { mongourl, port, users_allowed_in_room } = require("./config");
const TextEditor = require("./schema/TextEditorSchema");
//mongoose connection
mongoose.connect(`${mongourl}`, { useNewUrlParser: true });
// initialize the express server
const app = express();
app.use(cors());
const server = require("http").Server(app);
// setup CORS policy
const io = require("socket.io")(server, {
cors: {
origin: "*",
methods: ["GET", "POST"],
},
});
// setup peer server
const peerServer = ExpressPeerServer(server, {
path: "/",
});
app.use("/peerjs", peerServer);
// constants
//initial text in every new text-editor (blank)
const DEFAULT_TEXT = "";
//users -> dictionary of roomID:[array of users(their socket ID's) in that room]
const users = {};
//socketID->roomID mapping
const socketToRoom = {};
io.on("connection", (socket) => {
// for text-editor
socket.on("get-text-editor-data", async (roomID) => {
//find if the room exists, fetch text data from DB
const document = await findOrCreateTextData(roomID);
socket.join(roomID);
//if room exists send text editor data to user
socket.emit("load-text-editor-data", document.data);
//if user makes changes -> broadcast delta changes to everyone in that room
socket.on("send-text-changes", (delta) => {
socket.broadcast.to(roomID).emit("receive-text-changes", delta);
});
//save received changes to mongo-database
socket.on("save-text-editor-data", async (data) => {
await TextEditor.findByIdAndUpdate(roomID, { data });
});
});
// for video / audio calls
socket.on("join-video-room", (roomID) => {
//if room exists -> add user to room
if (users[roomID]) {
const length = users[roomID].length;
//if room is full -> reject user (max 5 users allowed to avoid overload on client)
if (length === users_allowed_in_room) {
socket.emit("room-full-reject");
return;
}
//else add user to room
users[roomID].push(socket.id);
} else {
//create new room on backend
users[roomID] = [socket.id];
}
//add roomID->socketID mapping
socketToRoom[socket.id] = roomID;
// send all other users to the user who just joined (except his own ID)
const usersInThisRoom = users[roomID].filter((id) => id !== socket.id);
socket.emit("all-users-in-room", usersInThisRoom);
});
socket.on("sending-signal", (payload) => {
io.to(payload.userToSignal).emit("user-joined", {
signal: payload.signal,
callerID: payload.callerID,
});
});
socket.on("returning-signal", (payload) => {
io.to(payload.callerID).emit("receiving-returned-signal", {
signal: payload.signal,
id: socket.id,
});
});
socket.on("disconnect", () => {
//remove user from room is user disconnects
const roomID = socketToRoom[socket.id];
var room = users[roomID];
if (room) {
room = room.filter((id) => id !== socket.id);
users[roomID] = room;
}
//broadcast to everyone that this particular user has left
socket.broadcast.emit("user-left", socket.id);
});
});
// if room exists -> send text data of room, else send default text
const findOrCreateTextData = async (roomID) => {
if (roomID == null) return;
//fetch text editor data of room from mongoDB
const textEditorData = await TextEditor.findById(roomID);
if (textEditorData) return textEditorData;
//if not present return new data
return await TextEditor.create({ _id: roomID, data: DEFAULT_TEXT });
};
// listen
server.listen(port || 5000);