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export interface GhostState {
id: string;
x: number;
y: number;
vx: number;
vy: number;
height: number;
layer: string;
cycle: number;
updatedAt: number;
}
interface WelcomeMessage {
type: 'welcome';
id: string;
}
interface SnapshotMessage {
type: 'snapshot';
players: GhostState[];
}
interface StateMessage {
type: 'state';
x: number;
y: number;
vx: number;
vy: number;
height: number;
layer: string;
cycle: number;
}
interface DiscoveryResponse {
servers?: Array<{
url: string;
region?: string;
}>;
}
export interface NetworkStatus {
label: string;
detail: string;
peers: number;
}
const DEFAULT_DISCOVERY = 'http://localhost:8080/servers';
const DEFAULT_SOCKET = 'ws://localhost:8080/ws';
export class NetworkClient {
private socket?: WebSocket;
private discoveryUrl: string;
private fallbackUrl: string;
private reconnectHandle?: number;
private stateBuffer?: StateMessage;
private flushHandle?: number;
private selfId?: string;
private snapshotHandler: (players: GhostState[]) => void;
private statusHandler: (status: NetworkStatus) => void;
constructor(
snapshotHandler: (players: GhostState[]) => void,
statusHandler: (status: NetworkStatus) => void
) {
this.snapshotHandler = snapshotHandler;
this.statusHandler = statusHandler;
this.discoveryUrl = import.meta.env.VITE_DISCOVERY_URL ?? DEFAULT_DISCOVERY;
this.fallbackUrl = import.meta.env.VITE_WS_URL ?? DEFAULT_SOCKET;
}
start(): void {
void this.connect();
}
stop(): void {
if (this.reconnectHandle) {
window.clearTimeout(this.reconnectHandle);
this.reconnectHandle = undefined;
}
if (this.flushHandle) {
window.clearInterval(this.flushHandle);
this.flushHandle = undefined;
}
this.socket?.close();
this.socket = undefined;
}
updateState(state: Omit<StateMessage, 'type'>): void {
this.stateBuffer = { type: 'state', ...state };
}
private async connect(): Promise<void> {
this.statusHandler({ label: 'network', detail: 'discovering ghost relay…', peers: 0 });
const target = await this.resolveSocketUrl();
this.socket = new WebSocket(target);
this.socket.addEventListener('open', () => {
this.statusHandler({ label: 'network', detail: `ghost relay online · ${target}`, peers: 0 });
this.startFlusher();
});
this.socket.addEventListener('message', (event) => {
this.handleMessage(event.data);
});
this.socket.addEventListener('close', () => {
this.statusHandler({ label: 'network', detail: 'ghost relay offline · retrying…', peers: 0 });
this.snapshotHandler([]);
this.socket = undefined;
this.selfId = undefined;
this.stopFlusher();
this.reconnectHandle = window.setTimeout(() => {
void this.connect();
}, 2000);
});
this.socket.addEventListener('error', () => {
this.statusHandler({ label: 'network', detail: 'ghost relay unreachable', peers: 0 });
});
}
private async resolveSocketUrl(): Promise<string> {
try {
const response = await fetch(this.discoveryUrl, { headers: { Accept: 'application/json' } });
if (!response.ok) {
return this.fallbackUrl;
}
const payload = (await response.json()) as DiscoveryResponse;
const first = payload.servers?.[0]?.url;
return first ?? this.fallbackUrl;
} catch {
return this.fallbackUrl;
}
}
private startFlusher(): void {
this.stopFlusher();
this.flushHandle = window.setInterval(() => {
if (!this.socket || this.socket.readyState !== WebSocket.OPEN || !this.stateBuffer) {
return;
}
this.socket.send(JSON.stringify(this.stateBuffer));
}, 80);
}
private stopFlusher(): void {
if (!this.flushHandle) {
return;
}
window.clearInterval(this.flushHandle);
this.flushHandle = undefined;
}
private handleMessage(raw: string): void {
let parsed: WelcomeMessage | SnapshotMessage | undefined;
try {
parsed = JSON.parse(raw) as WelcomeMessage | SnapshotMessage;
} catch {
return;
}
if (parsed.type === 'welcome') {
this.selfId = parsed.id;
return;
}
if (parsed.type === 'snapshot') {
const others = parsed.players.filter((player) => player.id !== this.selfId);
this.snapshotHandler(others);
this.statusHandler({
label: 'network',
detail: this.socket?.url ? `ghost relay online · ${this.socket.url}` : 'ghost relay online',
peers: others.length
});
}
}
}
|
