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mod.ts
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mod.ts
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import { writeAll } from "https://deno.land/[email protected]/streams/write_all.ts";
import { readLines } from "https://deno.land/[email protected]/io/read_lines.ts";
import { encodeHex } from "https://deno.land/[email protected]/encoding/hex.ts";
const decoder = new TextDecoder();
const encoder = new TextEncoder();
type ClientData = Record<string, any>;
interface BasePacket {
clientId?: number;
roomId?: string;
quiet?: boolean;
targetClientId?: number;
}
interface UpdateClientDataPacket extends BasePacket {
type: "UPDATE_CLIENT_DATA";
data: ClientData;
}
interface AllClientDataPacket extends BasePacket {
type: "ALL_CLIENT_DATA";
clients: ClientData[];
}
interface ServerMessagePacket extends BasePacket {
type: "SERVER_MESSAGE";
message: string;
}
interface DisableAnchorPacket extends BasePacket {
type: "DISABLE_ANCHOR";
}
interface OtherPackets extends BasePacket {
type:
| "REQUEST_SAVE_STATE"
| "PUSH_SAVE_STATE"
| "GAME_COMPLETE"
| "HEARTBEAT";
}
type Packet =
| UpdateClientDataPacket
| DisableAnchorPacket
| ServerMessagePacket
| AllClientDataPacket
| OtherPackets;
interface ServerStats {
lastStatsHeartbeat: number;
clientSHAs: Record<string, boolean>;
onlineCount: number;
gamesCompleted: number;
pid: number;
}
const port =
(Deno.env.has("PORT") && !isNaN(parseInt(Deno.env.get("PORT")!, 10)))
? parseInt(Deno.env.get("PORT")!, 10)
: 43385;
let quietMode = !!Deno.env.has("QUIET");
const stats_file = Deno.env.get("STATS_FILE") || "./stats.json";
class Server {
private listener?: Deno.Listener;
public clients: Client[] = [];
public rooms: Room[] = [];
public stats: ServerStats = {
lastStatsHeartbeat: Date.now(),
clientSHAs: {},
onlineCount: 0,
gamesCompleted: 0,
pid: Deno.pid,
};
async start() {
await this.parseStats();
this.statsHeartbeat();
this.clientHeartbeat();
this.startServer();
}
async parseStats() {
try {
const statsString = await Deno.readTextFile(stats_file);
this.stats = Object.assign(this.stats, JSON.parse(statsString));
this.stats.pid = Deno.pid;
this.log("Loaded stats file");
} catch (_) {
this.log("No stats file found");
}
}
async statsHeartbeat() {
try {
this.stats.lastStatsHeartbeat = Date.now();
this.stats.onlineCount = this.clients.length;
await this.saveStats();
} catch (error) {
this.log(`Error saving stats: ${error.message}`);
}
setTimeout(() => {
this.statsHeartbeat();
}, 2500);
}
async clientHeartbeat() {
try {
await Promise.all(server.clients.map((client) => {
return client.sendPacket({
type: "HEARTBEAT",
}).catch((_) => {}); // Ignore errors, client will disconnect if it's a problem
}));
} catch (error) {
this.log(`Error sending heartbeat to clients: ${error.message}`);
}
setTimeout(() => {
this.clientHeartbeat();
}, 1000 * 30);
}
async saveStats() {
try {
await Deno.writeTextFile(
stats_file,
JSON.stringify(this.stats, null, 4),
);
} catch (error) {
this.log(`Error saving stats: ${error.message}`);
}
}
async startServer() {
this.listener = Deno.listen({ port });
this.log(`Server Started on port ${port}`);
try {
for await (const connection of this.listener) {
try {
const client = new Client(connection, this);
this.clients.push(client);
} catch (error) {
this.log(`Error connecting client: ${error.message}`);
}
}
} catch (error) {
this.log(`Error starting server: ${error.message}`);
}
}
removeClient(client: Client) {
const index = this.clients.indexOf(client);
if (index !== -1) {
this.clients.splice(index, 1);
}
}
getOrCreateRoom(id: string) {
const room = this.rooms.find((room) => room.id === id);
if (room) {
return room;
}
const newRoom = new Room(id, this);
this.rooms.push(newRoom);
return newRoom;
}
removeRoom(room: Room) {
const index = this.rooms.indexOf(room);
if (index !== -1) {
this.rooms.splice(index, 1);
}
}
log(...data: any[]) {
console.log(`[Server]:`, ...data);
}
}
class Client {
public id: number;
public data: ClientData = {};
public connection: Deno.Conn;
public server: Server;
public room?: Room;
constructor(connection: Deno.Conn, server: Server) {
this.connection = connection;
this.server = server;
this.id = connection.rid;
// SHA256 to get a rough idea of how many unique players there are
crypto.subtle.digest(
"SHA-256",
encoder.encode((this.connection.remoteAddr as Deno.NetAddr).hostname),
)
.then((hasBuffer) => {
this.server.stats.onlineCount++;
this.server.stats.clientSHAs[encodeHex(hasBuffer)] = true;
})
.catch((error) => {
this.log(`Error hashing client: ${error.message}`);
});
this.waitForData();
this.log("Connected");
}
async waitForData() {
const buffer = new Uint8Array(1024);
let data = new Uint8Array(0);
while (true) {
let count: null | number = 0;
try {
count = await this.connection.read(buffer);
} catch (error) {
this.log(`Error reading from connection: ${error.message}`);
this.disconnect();
break;
}
if (!count) {
this.disconnect();
break;
}
// Concatenate received data with the existing data
const receivedData = buffer.subarray(0, count);
data = concatUint8Arrays(data, receivedData);
// Handle all complete packets (while loop in case multiple packets were received at once)
while (true) {
const delimiterIndex = findDelimiterIndex(data);
if (delimiterIndex === -1) {
break; // Incomplete packet, wait for more data
}
// Extract the packet
const packet = data.subarray(0, delimiterIndex);
data = data.subarray(delimiterIndex + 1);
this.handlePacket(packet);
}
}
}
handlePacket(packet: Uint8Array) {
try {
const packetString = decoder.decode(packet);
const packetObject: Packet = JSON.parse(packetString);
packetObject.clientId = this.id;
if (!packetObject.quiet && !quietMode) {
this.log(`-> ${packetObject.type} packet`);
}
if (packetObject.type === "UPDATE_CLIENT_DATA") {
this.data = packetObject.data;
}
if (packetObject.type === "GAME_COMPLETE") {
this.server.stats.gamesCompleted++;
}
if (packetObject.roomId && !this.room) {
this.server.getOrCreateRoom(packetObject.roomId).addClient(this);
}
if (!this.room) {
this.log("Not in a room, ignoring packet");
return;
}
if (packetObject.targetClientId) {
const targetClient = this.room.clients.find((client) =>
client.id === packetObject.targetClientId
);
if (targetClient) {
targetClient.sendPacket(packetObject);
} else {
this.log(`Target client ${packetObject.targetClientId} not found`);
}
return;
}
if (packetObject.type === "REQUEST_SAVE_STATE") {
if (this.room.clients.length > 1) {
this.room.requestingStateClients.push(this);
this.room.broadcastPacket(packetObject, this);
}
} else if (packetObject.type === "PUSH_SAVE_STATE") {
const roomStateRequests = this.room.requestingStateClients;
roomStateRequests.forEach((client) => {
client.sendPacket(packetObject);
});
this.room.requestingStateClients = [];
} else {
this.room.broadcastPacket(packetObject, this);
}
} catch (error) {
this.log(`Error handling packet: ${error.message}`);
}
}
async sendPacket(packetObject: Packet) {
try {
if (!packetObject.quiet && !quietMode) {
this.log(`<- ${packetObject.type} packet`);
}
const packetString = JSON.stringify(packetObject);
const packet = encoder.encode(packetString + "\0");
// Wait for writeAll to complete, if it takes longer than 30 seconds, disconnect
await Promise.race([
writeAll(this.connection, packet),
new Promise((_, reject) => {
setTimeout(() => {
reject(new Error("Timeout, took longer than 30 seconds to send"));
}, 1000 * 30);
}),
]);
} catch (error) {
this.log(`Error sending packet: ${error.message}`);
this.disconnect();
}
}
disconnect() {
try {
if (this.room) {
this.room.removeClient(this);
}
this.server.removeClient(this);
this.connection.close();
} catch (error) {
this.log(`Error disconnecting: ${error.message}`);
} finally {
this.server.stats.onlineCount--;
this.log("Disconnected");
}
}
log(message: string) {
console.log(`[Client ${this.id}]: ${message}`);
}
}
class Room {
public id: string;
public server: Server;
public clients: Client[] = [];
public requestingStateClients: Client[] = [];
constructor(id: string, server: Server) {
this.id = id;
this.server = server;
this.log("Created");
}
addClient(client: Client) {
this.log(`Adding client ${client.id}`);
this.clients.push(client);
client.room = this;
this.broadcastAllClientData();
}
removeClient(client: Client) {
this.log(`Removing client ${client.id}`);
const index = this.clients.indexOf(client);
if (index !== -1) {
this.clients.splice(index, 1);
client.room = undefined;
}
if (this.clients.length) {
this.broadcastAllClientData();
} else {
this.log("No clients left, removing room");
this.server.removeRoom(this);
}
}
broadcastAllClientData() {
if (!quietMode) {
this.log("<- ALL_CLIENT_DATA packet");
}
for (const client of this.clients) {
const packetObject = {
type: "ALL_CLIENT_DATA" as const,
roomId: this.id,
clients: this.clients.filter((c) => c !== client).map((c) => ({
clientId: c.id,
...c.data,
})),
};
client.sendPacket(packetObject);
}
}
broadcastPacket(packetObject: Packet, sender: Client) {
if (!packetObject.quiet && !quietMode) {
this.log(`<- ${packetObject.type} packet from ${sender.id}`);
}
for (const client of this.clients) {
if (client !== sender) {
client.sendPacket(packetObject);
}
}
}
log(message: string) {
console.log(`[Room ${this.id}]: ${message}`);
}
}
function concatUint8Arrays(a: Uint8Array, b: Uint8Array): Uint8Array {
const result = new Uint8Array(a.length + b.length);
result.set(a, 0);
result.set(b, a.length);
return result;
}
function findDelimiterIndex(data: Uint8Array): number {
for (let i = 0; i < data.length; i++) {
if (data[i] === 0 /* null terminator */) {
return i;
}
}
return -1;
}
const server = new Server();
server.start().catch((error) => {
console.error("Error starting server: ", error);
Deno.exit(1);
});
globalThis.addEventListener("unhandledrejection", (e) => {
console.error("Unhandled rejection at:", e.promise, "reason:", e.reason);
e.preventDefault();
Deno.exit(1);
});
function sendServerMessage(client: Client, message: string) {
return client.sendPacket({
type: "SERVER_MESSAGE",
message,
});
}
function sendDisable(client: Client, message: string) {
sendServerMessage(client, message)
.finally(() =>
client.sendPacket({
type: "DISABLE_ANCHOR",
})
);
}
async function stop(message = "Server restarting") {
await Promise.all(
server.clients.map((client) =>
sendServerMessage(client, message)
.finally(() => {
client.disconnect();
})
),
);
Deno.exit();
}
(async function processStdin() {
try {
for await (const line of readLines(Deno.stdin)) {
const [command, ...args] = line.split(" ");
switch (command) {
default:
case "help": {
console.log(
`Available commands:
help: Show this help message
stats: Print server stats
quiet: Toggle quiet mode
roomCount: Show the number of rooms
clientCount: Show the number of clients
list: List all rooms and clients
stop <message>: Stop the server
message <clientId> <message>: Send a message to a client
messageAll <message>: Send a message to all clients
disable <clientId> <message>: Disable anchor on a client
disableAll <message>: Disable anchor on all clients`,
);
break;
}
case "roomCount": {
console.log(`Room count: ${server.rooms.length}`);
break;
}
case "clientCount": {
console.log(`Client count: ${server.clients.length}`);
break;
}
case "quiet": {
quietMode = !quietMode;
console.log(`Quiet mode: ${quietMode}`);
break;
}
case "stats": {
const { clientSHAs: _, ...stats } = server.stats;
console.log(stats);
break;
}
case "list": {
for (const room of server.rooms) {
console.log(`Room ${room.id}:`);
for (const client of room.clients) {
console.log(
` Client ${client.id}: ${JSON.stringify(client.data)}`,
);
}
}
break;
}
case "disable": {
const [clientId, ...messageParts] = args;
const message = messageParts.join(" ");
const client = server.clients.find((c) =>
c.id === parseInt(clientId, 10)
);
if (client) {
sendDisable(client, message);
} else {
console.log(`Client ${clientId} not found`);
}
break;
}
case "disableAll": {
const message = args.join(" ");
for (const client of server.clients) {
sendDisable(client, message);
}
break;
}
case "message": {
const [clientId, ...messageParts] = args;
const message = messageParts.join(" ");
const client = server.clients.find((c) =>
c.id === parseInt(clientId, 10)
);
if (client) {
sendServerMessage(client, message);
} else {
console.log(`Client ${clientId} not found`);
}
break;
}
case "messageAll": {
const message = args.join(" ");
for (const client of server.clients) {
sendServerMessage(client, message);
}
break;
}
case "stop": {
const message = args.join(" ");
stop(message);
break;
}
}
}
} catch (error) {
console.error("Error reading from stdin: ", error.message);
processStdin();
}
})();