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import { sleep } from 'decky-frontend-lib';
import Logger from './logger';
declare global {
export var DeckyBackend: WSRouter;
}
enum MessageType {
ERROR = -1,
// Call-reply, Frontend -> Backend -> Frontend
CALL = 0,
REPLY = 1,
// Pub/Sub, Backend -> Frontend
EVENT = 3,
}
interface CallMessage {
type: MessageType.CALL;
args: any[];
route: string;
id: number;
}
interface ReplyMessage {
type: MessageType.REPLY;
result: any;
id: number;
}
interface ErrorMessage {
type: MessageType.ERROR;
error: any;
id: number;
}
interface EventMessage {
type: MessageType.EVENT;
event: string;
args: any;
}
type Message = CallMessage | ReplyMessage | ErrorMessage | EventMessage;
// Helper to resolve a promise from the outside
interface PromiseResolver<T> {
resolve: (res: T) => void;
reject: (error: string) => void;
promise: Promise<T>;
}
export class WSRouter extends Logger {
routes: Map<string, (...args: any) => any> = new Map();
runningCalls: Map<number, PromiseResolver<any>> = new Map();
eventListeners: Map<string, Set<(...args: any) => any>> = new Map();
ws?: WebSocket;
connectPromise?: Promise<void>;
// Used to map results and errors to calls
reqId: number = 0;
constructor() {
super('WSRouter');
}
connect() {
return (this.connectPromise = new Promise<void>((resolve) => {
// Auth is a query param as JS WebSocket doesn't support headers
this.ws = new WebSocket(`ws://127.0.0.1:1337/ws?auth=${deckyAuthToken}`);
this.ws.addEventListener('open', () => {
this.debug('WS Connected');
resolve();
delete this.connectPromise;
});
this.ws.addEventListener('message', this.onMessage.bind(this));
this.ws.addEventListener('close', this.onError.bind(this));
// this.ws.addEventListener('error', this.onError.bind(this));
}));
}
createPromiseResolver<T>(): PromiseResolver<T> {
let resolver: Partial<PromiseResolver<T>> = {};
const promise = new Promise<T>((resolve, reject) => {
resolver.resolve = resolve;
resolver.reject = reject;
});
resolver.promise = promise;
// The promise will always run first
// @ts-expect-error 2454
return resolver;
}
async write(data: Message) {
if (this.connectPromise) await this.connectPromise;
this.ws?.send(JSON.stringify(data));
}
addRoute(name: string, route: (...args: any) => any) {
this.routes.set(name, route);
}
removeRoute(name: string) {
this.routes.delete(name);
}
addEventListener(event: string, listener: (...args: any) => any) {
if (!this.eventListeners.has(event)) {
this.eventListeners.set(event, new Set([listener]));
} else {
this.eventListeners.get(event)?.add(listener);
}
return listener;
}
removeEventListener(event: string, listener: (...args: any) => any) {
if (this.eventListeners.has(event)) {
const set = this.eventListeners.get(event);
set?.delete(listener);
if (set?.size === 0) {
this.eventListeners.delete(event);
}
}
}
async onMessage(msg: MessageEvent) {
try {
const data = JSON.parse(msg.data) as Message;
switch (data.type) {
case MessageType.CALL:
if (this.routes.has(data.route)) {
try {
const res = await this.routes.get(data.route)!(...data.args);
this.write({ type: MessageType.REPLY, id: data.id, result: res });
this.debug(`Started JS call ${data.route} ID ${data.id}`);
} catch (e) {
await this.write({ type: MessageType.ERROR, id: data.id, error: (e as Error)?.stack || e });
}
} else {
await this.write({ type: MessageType.ERROR, id: data.id, error: `Route ${data.route} does not exist.` });
}
break;
case MessageType.REPLY:
if (this.runningCalls.has(data.id)) {
this.runningCalls.get(data.id)!.resolve(data.result);
this.runningCalls.delete(data.id);
this.debug(`Resolved PY call ${data.id} with value`, data.result);
}
break;
case MessageType.ERROR:
if (this.runningCalls.has(data.id)) {
this.runningCalls.get(data.id)!.reject(data.error);
this.runningCalls.delete(data.id);
this.debug(`Rejected PY call ${data.id} with error`, data.error);
}
break;
case MessageType.EVENT:
if (this.eventListeners.has(data.event)) {
for (const listener of this.eventListeners.get(data.event)!) {
try {
listener(...data.args);
} catch (e) {
this.error(`error in event ${data.event}`, e, listener);
}
}
} else {
this.debug(`event ${data.event} has no listeners`);
}
break;
default:
this.error('Unknown message type', data);
break;
}
} catch (e) {
this.error('Error parsing WebSocket message', e);
}
}
// this.call<[number, number], string>('methodName', 1, 2);
call<Args extends any[] = [], Return = void>(route: string, ...args: Args): Promise<Return> {
const resolver = this.createPromiseResolver<Return>();
const id = ++this.reqId;
this.runningCalls.set(id, resolver);
this.debug(`Calling PY method ${route} with args`, args);
this.write({ type: MessageType.CALL, route, args, id });
return resolver.promise;
}
callable<Args extends any[] = [], Return = void>(route: string): (...args: Args) => Promise<Return> {
return (...args) => this.call<Args, Return>(route, ...args);
}
async onError(error: any) {
this.error('WS DISCONNECTED', error);
// TODO queue up lost messages and send them once we connect again
await sleep(5000);
await this.connect();
}
}
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