godot-webrtc-mplayer-testing/server.ts

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const MAX_PEERS = 4096;
const MAX_LOBBIES = 1024;
const PORT = 9080;
const ALFNUM = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
const NO_LOBBY_TIMEOUT = 1000;
const SEAL_CLOSE_TIMEOUT = 10000;
const PING_INTERVAL = 10000;
const STR_NO_LOBBY = "Have not joined lobby yet";
const STR_HOST_DISCONNECTED = "Room host has disconnected";
const STR_ONLY_HOST_CAN_SEAL = "Only host can seal the lobby";
const STR_SEAL_COMPLETE = "Seal complete";
const STR_TOO_MANY_LOBBIES = "Too many lobbies open, disconnecting";
const STR_ALREADY_IN_LOBBY = "Already in a lobby";
const STR_LOBBY_DOES_NOT_EXISTS = "Lobby does not exists";
const STR_LOBBY_IS_SEALED = "Lobby is sealed";
const STR_INVALID_FORMAT = "Invalid message format";
const STR_NEED_LOBBY = "Invalid message when not in a lobby";
const STR_SERVER_ERROR = "Server error, lobby not found";
const STR_INVALID_DEST = "Invalid destination";
const STR_INVALID_CMD = "Invalid command";
const STR_TOO_MANY_PEERS = "Too many peers connected";
function randomInt(low: number, high: number) {
return Math.floor(Math.random() * (high - low + 1) + low);
}
function randomId() {
const arr = new Int32Array(1);
crypto.getRandomValues(arr);
return Math.abs(arr[0]);
}
function randomSecret() {
let out = "";
for (let i = 0; i < 16; i++) {
out += ALFNUM[randomInt(0, ALFNUM.length - 1)];
}
return out;
}
class ProtoError extends Error {
code: number;
constructor(code: number, message: string) {
super(message);
this.code = code;
}
}
class Peer {
id: number;
ws: WebSocket;
lobby: string;
timeout: number;
constructor(id: number, ws: WebSocket) {
this.id = id;
this.ws = ws;
this.lobby = "";
// Close connection after 1 sec if client has not joined a lobby
this.timeout = setTimeout(() => {
if (!this.lobby) ws.close(4000, STR_NO_LOBBY);
}, NO_LOBBY_TIMEOUT);
}
}
class Lobby {
name: string;
host: number;
peers: Peer[];
sealed: boolean;
closeTimer: number;
constructor(name: string, host: number) {
this.name = name;
this.host = host;
this.peers = [];
this.sealed = false;
this.closeTimer = -1;
}
getPeerId(peer: Peer) {
if (this.host === peer.id) return 1;
return peer.id;
}
join(peer: Peer) {
const assigned = this.getPeerId(peer);
peer.ws.send(`I: ${assigned}\n`);
this.peers.forEach((p) => {
p.ws.send(`N: ${assigned}\n`);
peer.ws.send(`N: ${this.getPeerId(p)}\n`);
});
this.peers.push(peer);
}
leave(peer: Peer) {
const idx = this.peers.findIndex((p) => peer === p);
if (idx === -1) return false;
const assigned = this.getPeerId(peer);
const close = assigned === 1;
this.peers.forEach((p) => {
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try {
// Room host disconnected, must close.
if (close) p.ws.close(4000, STR_HOST_DISCONNECTED);
// Notify peer disconnect.
else p.ws.send(`D: ${assigned}\n`);
} catch (e) {
console.error(`Error when leaving: ${e}`);
}
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});
this.peers.splice(idx, 1);
if (close && this.closeTimer >= 0) {
// We are closing already.
clearTimeout(this.closeTimer);
this.closeTimer = -1;
}
return close;
}
seal(peer: Peer) {
// Only host can seal
if (peer.id !== this.host) {
throw new ProtoError(4000, STR_ONLY_HOST_CAN_SEAL);
}
this.sealed = true;
this.peers.forEach((p) => {
p.ws.send("S: \n");
});
console.log(
`Peer ${peer.id} sealed lobby ${this.name} ` +
`with ${this.peers.length} peers`,
);
this.closeTimer = setTimeout(() => {
// Close peer connection to host (and thus the lobby)
this.peers.forEach((p) => {
p.ws.close(1000, STR_SEAL_COMPLETE);
});
}, SEAL_CLOSE_TIMEOUT);
}
}
const lobbies = new Map();
let peersCount = 0;
function joinLobby(peer: Peer, lobbyName: string) {
if (lobbyName === "") {
if (lobbies.size >= MAX_LOBBIES) {
throw new ProtoError(4000, STR_TOO_MANY_LOBBIES);
}
// Peer must not already be in a lobby
if (peer.lobby !== "") {
throw new ProtoError(4000, STR_ALREADY_IN_LOBBY);
}
lobbyName = randomSecret();
lobbies.set(lobbyName, new Lobby(lobbyName, peer.id));
console.log(`Peer ${peer.id} created lobby ${lobbyName}`);
console.log(`Open lobbies: ${lobbies.size}`);
}
const lobby = lobbies.get(lobbyName);
if (!lobby) throw new ProtoError(4000, STR_LOBBY_DOES_NOT_EXISTS);
if (lobby.sealed) throw new ProtoError(4000, STR_LOBBY_IS_SEALED);
peer.lobby = lobbyName;
console.log(
`Peer ${peer.id} joining lobby ${lobbyName} ` +
`with ${lobby.peers.length} peers`,
);
lobby.join(peer);
peer.ws.send(`J: ${lobbyName}\n`);
}
function parseMsg(peer: Peer, msg: string) {
const sep = msg.indexOf("\n");
if (sep < 0) throw new ProtoError(4000, STR_INVALID_FORMAT);
const cmd = msg.slice(0, sep);
if (cmd.length < 3) throw new ProtoError(4000, STR_INVALID_FORMAT);
const data = msg.slice(sep);
// Lobby joining.
if (cmd.startsWith("J: ")) {
joinLobby(peer, cmd.substr(3).trim());
return;
}
if (!peer.lobby) throw new ProtoError(4000, STR_NEED_LOBBY);
const lobby = lobbies.get(peer.lobby);
if (!lobby) throw new ProtoError(4000, STR_SERVER_ERROR);
// Lobby sealing.
if (cmd.startsWith("S: ")) {
lobby.seal(peer);
return;
}
// Message relaying format:
//
// [O|A|C]: DEST_ID\n
// PAYLOAD
//
// O: Client is sending an offer.
// A: Client is sending an answer.
// C: Client is sending a candidate.
let destId = parseInt(cmd.substr(3).trim());
// Dest is not an ID.
if (!destId) throw new ProtoError(4000, STR_INVALID_DEST);
if (destId === 1) destId = lobby.host;
const dest = lobby.peers.find((p: Peer) => p.id === destId);
// Dest is not in this room.
if (!dest) throw new ProtoError(4000, STR_INVALID_DEST);
function isCmd(what: string) {
return cmd.startsWith(`${what}: `);
}
if (isCmd("O") || isCmd("A") || isCmd("C")) {
dest.ws.send(cmd[0] + ": " + lobby.getPeerId(peer) + data);
return;
}
throw new ProtoError(4000, STR_INVALID_CMD);
}
console.log(`Server running on port ${PORT}`);
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const server = Deno.listen({ port: PORT });
for await (const conn of server) {
(async () => {
const httpConn = Deno.serveHttp(conn);
for await (const requestEvent of httpConn) {
if (requestEvent) {
const { socket, response } = Deno.upgradeWebSocket(
requestEvent.request,
);
const id = randomId();
const peer = new Peer(id, socket);
socket.onopen = (_ev) => {
if (peersCount >= MAX_PEERS) {
socket.close(4000, STR_TOO_MANY_PEERS);
return;
}
peersCount++;
};
socket.onmessage = (ev) => {
try {
parseMsg(peer, ev.data);
} catch (e) {
const code = e.code || 4000;
console.log(`Error parsing message from ${id}:\n` + ev.data);
socket.close(code, e.message);
}
};
socket.onclose = (ev) => {
peersCount--;
console.log(
`Connection with peer ${peer.id} closed ` +
`with reason: ${ev.reason}`,
);
if (
peer.lobby &&
lobbies.has(peer.lobby) &&
lobbies.get(peer.lobby).leave(peer)
) {
lobbies.delete(peer.lobby);
console.log(`Deleted lobby ${peer.lobby}`);
console.log(`Open lobbies: ${lobbies.size}`);
peer.lobby = "";
}
if (peer.timeout >= 0) {
clearTimeout(peer.timeout);
peer.timeout = -1;
}
};
socket.onerror = (e) => console.error("WebSocket error:", e);
requestEvent.respondWith(response);
}
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}
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})();
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}