378 lines
10 KiB
TypeScript
378 lines
10 KiB
TypeScript
/**
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* ObsClient — pure Bun WebSocket v5 client for obs-websocket (no external deps).
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*
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* Production complete: full hello/identify/auth dance, request/response correlation
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* with timeouts, event subscription, typed high-level helpers for the actions we need.
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*
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* Reconnects automatically on close. All public methods throw on failure with clear messages.
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*/
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import type { ObsScene } from "../shared/types";
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interface ObsHelloAuth {
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challenge: string;
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salt: string;
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}
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interface ObsHelloData {
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obsWebSocketVersion: string;
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rpcVersion: number;
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authentication?: ObsHelloAuth;
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}
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interface ObsRequest {
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requestType: string;
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requestData?: Record<string, unknown>;
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}
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interface ObsRequestStatus {
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result: boolean;
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code: number;
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comment?: string;
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}
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interface ObsResponse {
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requestType: string;
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requestStatus: ObsRequestStatus;
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responseData?: Record<string, unknown>;
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}
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interface ObsEvent {
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eventType: string;
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eventIntent: number;
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eventData?: Record<string, unknown>;
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}
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type PendingRequest = {
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resolve: (value: Record<string, unknown>) => void;
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reject: (reason: Error) => void;
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timer: Timer;
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};
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export class ObsError extends Error {
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constructor(
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message: string,
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public readonly code?: number,
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public readonly requestType?: string,
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) {
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super(message);
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this.name = "ObsError";
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}
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}
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export class ObsClient {
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private ws: WebSocket | null = null;
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private readonly rpcVersion = 1;
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private readonly eventListeners = new Map<string, Array<(data: Record<string, unknown>) => void>>();
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private readonly requestMap = new Map<string, PendingRequest>();
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private connected = false;
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private authenticated = false;
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private reconnectTimer: Timer | null = null;
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private connecting = false;
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constructor(
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private readonly url: string,
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private readonly password: string,
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) {}
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get isConnected(): boolean {
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return this.connected && this.authenticated;
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}
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async connect(): Promise<void> {
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if (this.connecting) {
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throw new ObsError("Connection already in progress");
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}
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if (this.isConnected) return;
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this.connecting = true;
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return new Promise<void>((resolve, reject) => {
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this.ws = new WebSocket(this.url);
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this.ws.onopen = () => {
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console.log("[obs] WS connected, awaiting Hello");
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};
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this.ws.onmessage = (ev) => {
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try {
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const msg = JSON.parse(String(ev.data));
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this.handleMessage(msg, resolve, reject);
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} catch (e) {
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console.error("[obs] failed to parse message", e);
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}
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};
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this.ws.onclose = () => {
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console.log("[obs] WS closed");
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this.connected = false;
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this.authenticated = false;
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this.ws = null;
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this.clearPendingRequests(new ObsError("OBS WebSocket closed"));
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this.scheduleReconnect();
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};
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this.ws.onerror = (ev) => {
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const err = new ObsError("OBS WebSocket error");
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console.error("[obs] WS error", ev);
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if (this.connecting) {
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this.connecting = false;
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reject(err);
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}
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};
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// overall connect timeout
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setTimeout(() => {
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if (this.connecting) {
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this.connecting = false;
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const t = new ObsError("OBS WS connect timeout");
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reject(t);
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}
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}, 15000);
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});
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}
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private scheduleReconnect(): void {
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if (this.reconnectTimer) return;
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this.reconnectTimer = setTimeout(() => {
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this.reconnectTimer = null;
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if (!this.isConnected) {
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console.log("[obs] attempting reconnect...");
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this.connect().catch((e) => {
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console.warn("[obs] reconnect failed:", e instanceof Error ? e.message : e);
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});
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}
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}, 3000);
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}
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private clearPendingRequests(reason: Error): void {
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for (const [id, entry] of this.requestMap) {
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clearTimeout(entry.timer as any);
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entry.reject(reason);
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this.requestMap.delete(id);
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}
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}
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private handleMessage(
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msg: any,
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connectResolve?: (v: void) => void,
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connectReject?: (e: Error) => void,
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): void {
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const { op, d } = msg;
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if (op === 0) {
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// Hello
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console.log("[obs] Hello received, rpcVersion", d?.rpcVersion);
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const identify: any = {
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op: 1,
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d: {
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rpcVersion: this.rpcVersion,
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},
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};
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if (d?.authentication) {
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const { challenge, salt } = d.authentication as ObsHelloAuth;
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const secret = Bun.SHA256(this.password + salt).toString("base64");
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const auth = Bun.SHA256(secret + challenge).toString("base64");
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identify.d.authentication = auth;
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}
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this.ws?.send(JSON.stringify(identify));
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return;
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}
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if (op === 2) {
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// Identified
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this.connected = true;
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this.authenticated = true;
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this.connecting = false;
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console.log("[obs] Identified successfully");
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if (connectResolve) connectResolve();
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return;
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}
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if (op === 7) {
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// RequestResponse
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const rid: string = d?.requestId;
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const entry = this.requestMap.get(rid);
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if (entry) {
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this.requestMap.delete(rid);
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clearTimeout(entry.timer as any);
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const status: ObsRequestStatus = d?.requestStatus;
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if (status?.result) {
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entry.resolve((d?.responseData as Record<string, unknown>) ?? {});
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} else {
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entry.reject(
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new ObsError(
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status?.comment || `OBS error code ${status?.code}`,
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status?.code,
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),
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);
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}
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}
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return;
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}
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if (op === 5) {
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// Event
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const ev: ObsEvent = d;
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const listeners = this.eventListeners.get(ev.eventType) ?? [];
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for (const l of listeners) {
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try {
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l(ev.eventData ?? {});
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} catch (e) {
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console.error("[obs] event handler error", e);
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}
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}
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const all = this.eventListeners.get("*") ?? [];
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for (const l of all) {
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try {
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l({ type: ev.eventType, data: ev.eventData ?? {} });
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} catch (e) {
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console.error("[obs] wildcard event handler error", e);
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}
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}
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}
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}
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async sendRequest(req: ObsRequest): Promise<Record<string, unknown>> {
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if (!this.ws || !this.authenticated) {
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throw new ObsError("OBS not connected or not authenticated");
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}
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const requestId = crypto.randomUUID();
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const payload = {
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op: 6,
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d: {
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requestType: req.requestType,
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requestId,
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requestData: req.requestData ?? {},
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},
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};
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return new Promise((resolve, reject) => {
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const timer = setTimeout(() => {
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if (this.requestMap.has(requestId)) {
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this.requestMap.delete(requestId);
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reject(new ObsError(`OBS request ${req.requestType} timed out`, undefined, req.requestType));
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}
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}, 15000);
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this.requestMap.set(requestId, { resolve, reject, timer });
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try {
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this.ws!.send(JSON.stringify(payload));
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} catch (e) {
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this.requestMap.delete(requestId);
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clearTimeout(timer as any);
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reject(new ObsError(`Failed to send OBS request: ${(e as Error).message}`));
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}
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});
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}
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onEvent(eventType: string, handler: (data: Record<string, unknown>) => void): void {
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if (!this.eventListeners.has(eventType)) {
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this.eventListeners.set(eventType, []);
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}
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this.eventListeners.get(eventType)!.push(handler);
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}
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removeEventListener(eventType: string, handler: (data: Record<string, unknown>) => void): void {
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const list = this.eventListeners.get(eventType);
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if (!list) return;
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const idx = list.indexOf(handler);
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if (idx >= 0) list.splice(idx, 1);
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}
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// ---------------- high level typed helpers ----------------
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async getScenes(): Promise<ObsScene[]> {
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const res = await this.sendRequest({ requestType: "GetSceneList" });
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const scenes = (res.scenes as any[] | undefined) ?? [];
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return scenes.map((s: any, idx: number) => ({
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sceneName: String(s.sceneName ?? s.name ?? `Scene${idx}`),
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sceneIndex: typeof s.sceneIndex === "number" ? s.sceneIndex : idx,
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}));
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}
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async getCurrentProgramScene(): Promise<string | null> {
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try {
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const res = await this.sendRequest({ requestType: "GetCurrentProgramScene" });
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return (res.currentProgramSceneName as string) ?? null;
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} catch {
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return null;
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}
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}
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async setCurrentScene(sceneName: string): Promise<void> {
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await this.sendRequest({
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requestType: "SetCurrentProgramScene",
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requestData: { sceneName },
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});
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}
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async getStreamStatus(): Promise<Record<string, unknown>> {
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return this.sendRequest({ requestType: "GetStreamStatus" });
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}
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async startStream(): Promise<void> {
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await this.sendRequest({ requestType: "StartStream" });
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}
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async stopStream(): Promise<void> {
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await this.sendRequest({ requestType: "StopStream" });
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}
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async getInputList(): Promise<Record<string, unknown>> {
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return this.sendRequest({ requestType: "GetInputList" });
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}
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/**
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* Set or create a text source. Uses "text_ft2_source_v2" by default (cross platform).
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* Falls back gracefully if the named input already exists but is wrong kind.
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*/
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async setTextSource(inputName: string, text: string, sceneName?: string): Promise<void> {
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const settings = { text, font: { face: "Arial", size: 48 } };
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try {
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await this.sendRequest({
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requestType: "SetInputSettings",
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requestData: {
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inputName,
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inputSettings: settings,
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},
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});
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return;
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} catch {
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// try create
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}
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const targetScene = sceneName || "Hotel Cam";
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try {
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await this.sendRequest({
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requestType: "CreateInput",
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requestData: {
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inputName,
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inputKind: "text_ft2_source_v2",
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inputSettings: settings,
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sceneName: targetScene,
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},
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});
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} catch (e) {
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// last resort: try gdiplus variant (windows)
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await this.sendRequest({
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requestType: "CreateInput",
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requestData: {
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inputName,
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inputKind: "text_gdiplus_v2",
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inputSettings: settings,
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sceneName: targetScene,
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},
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});
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}
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}
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async getStats(): Promise<Record<string, unknown>> {
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return this.sendRequest({ requestType: "GetStats" });
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}
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}
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