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import { Game } from '@engine/Game';
import { Player } from '@engine/entities';
import { Message, MessageType } from '@engine/network';
import { Constants } from './constants';
import {
ServerSocketMessageReceiver,
ServerSocketMessagePublisher,
SessionData,
ServerMessage,
Session,
SessionManager
} from './network';
import { parse } from '@engine/utils';
import { Server, ServerWebSocket } from 'bun';
import { Input } from '@engine/systems';
import { Control, NetworkUpdateable } from '@engine/components';
import { stringify } from '@engine/utils';
export class GameServer {
private server?: Server;
private game: Game;
private messageReceiver: ServerSocketMessageReceiver;
private messagePublisher: ServerSocketMessagePublisher;
private sessionManager: SessionManager;
constructor(
game: Game,
messageReceiver: ServerSocketMessageReceiver,
messagePublisher: ServerSocketMessagePublisher,
sessionManager: SessionManager
) {
this.game = game;
this.messageReceiver = messageReceiver;
this.messagePublisher = messagePublisher;
this.sessionManager = sessionManager;
}
public serve() {
if (!this.server)
this.server = Bun.serve<SessionData>({
port: Constants.SERVER_PORT,
fetch: (req, srv) => this.fetchHandler(req, srv),
websocket: {
open: (ws) => this.openWebsocket(ws),
message: (ws, msg) => {
if (typeof msg === 'string') this.websocketMessage(ws, msg);
},
close: (ws) => this.closeWebsocket(ws)
}
});
this.messagePublisher.setServer(this.server);
console.log(`Listening on ${this.server.hostname}:${this.server.port}`);
}
private websocketMessage(
websocket: ServerWebSocket<SessionData>,
message: string
) {
const receivedMessage = parse<ServerMessage>(message);
receivedMessage.sessionData = websocket.data;
this.messageReceiver.addMessage(receivedMessage);
}
private closeWebsocket(websocket: ServerWebSocket<SessionData>) {
const { sessionId } = websocket.data;
const sessionEntities =
this.sessionManager.getSession(sessionId)?.controllableEntities;
this.sessionManager.removeSession(sessionId);
if (!sessionEntities) return;
sessionEntities.forEach((id) => this.game.removeEntity(id));
this.messagePublisher.addMessage({
type: MessageType.REMOVE_ENTITIES,
body: Array.from(sessionEntities)
});
}
private openWebsocket(websocket: ServerWebSocket<SessionData>) {
websocket.subscribe(Constants.GAME_TOPIC);
const { sessionId } = websocket.data;
if (this.sessionManager.getSession(sessionId)) {
return;
}
const newSession: Session = {
sessionId,
controllableEntities: new Set(),
inputSystem: new Input(sessionId)
};
const player = new Player();
player.addComponent(new Control(sessionId));
player.addComponent(new NetworkUpdateable());
this.game.addEntity(player);
newSession.controllableEntities.add(player.id);
this.sessionManager.putSession(sessionId, newSession);
const addCurrentEntities: Message[] = [
{
type: MessageType.NEW_ENTITIES,
body: Array.from(this.game.entities.values())
.filter((entity) => entity.id != player.id)
.map((entity) => {
return {
id: entity.id,
entityName: entity.name,
args: entity.serialize()
};
})
}
];
websocket.sendText(stringify(addCurrentEntities));
const addNewPlayer: Message = {
type: MessageType.NEW_ENTITIES,
body: [
{
id: player.id,
entityName: player.name,
args: player.serialize()
}
]
};
this.messagePublisher.addMessage(addNewPlayer);
}
private fetchHandler(req: Request, server: Server): Response {
const url = new URL(req.url);
const headers = new Headers();
headers.set('Access-Control-Allow-Origin', '*');
if (url.pathname == '/assign') {
if (this.sessionManager.numSessions() > Constants.MAX_PLAYERS)
return new Response('too many players', { headers, status: 400 });
const sessionId = crypto.randomUUID();
headers.set('Set-Cookie', `SessionId=${sessionId};`);
return new Response(sessionId, { headers });
}
const cookie = req.headers.get('cookie');
if (!cookie) {
return new Response('No session', { headers, status: 401 });
}
const sessionId = cookie.split(';').at(0)!.split('SessionId=').at(1);
if (url.pathname == '/game') {
server.upgrade(req, {
headers,
data: {
sessionId
}
});
return new Response('upgraded to ws', { headers });
}
if (url.pathname == '/me') {
return new Response(sessionId, { headers });
}
return new Response('Not found', { headers, status: 404 });
}
}
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