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type BinaryTypeWSPackage = 'nodebuffer' | 'arraybuffer' | 'fragments';
type EventListenerOptions = boolean | { capture?: boolean; };
type AddEventListenerOptions = EventListenerOptions & { once?: boolean, passive?: boolean; };
type EventListenerOrEventListenerObject = (evt: MessageEvent) => unknown;
export interface MessageEvent<T = any> extends Event {
readonly data: T;
}
type CloseEventInit = EventInit & {
code?: number;
reason?: string;
wasClean?: boolean;
}
class CloseEvent extends Event {
readonly code: number;
readonly reason: string;
readonly wasClean: boolean;
constructor(type: string, init: CloseEventInit) {
super(type, init);
this.code = init.code ?? 1000;
this.reason = init.reason ?? '';
this.wasClean = init.wasClean ?? true;
}
}
interface WebSocketForceEventMap {
close: CloseEvent;
error: Event;
message: MessageEvent;
open: Event;
}
export interface WSLike {
url: string;
protocol: string;
extensions: string;
binaryType: BinaryType | BinaryTypeWSPackage;
bufferedAmount: number;
readyState: number;
dispatchEvent?(event: Event): boolean;
emit?(event: string, ...args: any[]): boolean;
close(code?: number, reason?: string): void;
send(data: string | ArrayBufferLike): void;
addEventListener(type: string, listener: any, options?: any): void;
removeEventListener(type: string, listener: any, options?: any): void;
onopen?: ((ev: any) => any) | null;
onclose?: ((ev: any) => any) | null;
onerror?: ((ev: any) => any) | null;
onmessage?: ((ev: any) => any) | null;
}
export class WebSocketForce<WSType extends WSLike = WSLike> {
private _ws: WSType;
private _closeListeners: Set<Function> = new Set();
private _forceClosed: boolean = false;
private _virtualCloseListeners: Array<{ listener: Function; once?: boolean; }> = [];
private _nativeCloseHandler: ((event: any) => void) | null = null;
readonly CONNECTING = 0;
readonly OPEN = 1;
readonly CLOSING = 2;
readonly CLOSED = 3;
static readonly CONNECTING = 0;
static readonly OPEN = 1;
static readonly CLOSING = 2;
static readonly CLOSED = 3;
constructor(ws: WSType) {
this._ws = ws;
}
private _registerNativeCloseHandler(): void {
if (this._nativeCloseHandler !== null) {
return;
}
this._nativeCloseHandler = (event: any) => {
this._triggerVirtualCloseListeners(event);
};
this._ws.addEventListener('close', this._nativeCloseHandler as any);
}
private _unregisterNativeCloseHandler(): void {
if (this._nativeCloseHandler !== null) {
this._ws.removeEventListener('close', this._nativeCloseHandler as any);
this._nativeCloseHandler = null;
}
}
private _triggerVirtualCloseListeners(event?: any): void {
const closeEvent = event || new CloseEvent('close', {
code: 1000,
reason: '',
wasClean: !this._forceClosed
});
const listenersToRemove: Function[] = [];
for (const entry of this._virtualCloseListeners) {
try {
entry.listener.call(this._ws, closeEvent);
if (entry.once) {
listenersToRemove.push(entry.listener);
}
} catch (error) {
console.error('Error in virtual close listener:', error);
}
}
for (const listener of listenersToRemove) {
this._closeListeners.delete(listener);
const index = this._virtualCloseListeners.findIndex(e => e.listener === listener);
if (index > -1) {
this._virtualCloseListeners.splice(index, 1);
}
}
}
get url(): string {
return this._ws.url;
}
get readyState(): number {
if (this._forceClosed) {
return this.CLOSED;
}
return this._ws.readyState;
}
get bufferedAmount(): number {
return this._ws.bufferedAmount;
}
get extensions(): string {
return this._ws.extensions;
}
get protocol(): string {
return this._ws.protocol;
}
get binaryType() {
return this._ws.binaryType;
}
set binaryType(type) {
this._ws.binaryType = type;
}
get onopen() {
return this._ws.onopen;
}
set onopen(handler) {
this._ws.onopen = handler;
}
get onclose() {
return this._ws.onclose;
}
set onclose(handler) {
if (this._ws.onclose) {
this._closeListeners.delete(this._ws.onclose);
}
if (handler) {
this._closeListeners.add(handler);
}
this._ws.onclose = handler;
}
get onerror() {
return this._ws.onerror;
}
set onerror(handler) {
this._ws.onerror = handler;
}
get onmessage() {
return this._ws.onmessage;
}
set onmessage(handler) {
this._ws.onmessage = handler;
}
close(code?: number, reason?: string): void {
this._ws.close(code, reason);
}
send(data: string | ArrayBufferLike): void {
this._ws.send(data);
}
addEventListener<K extends keyof WebSocketForceEventMap>(
type: K,
listener: (this: WebSocketForce, ev: WebSocketForceEventMap[K]) => unknown,
options?: boolean | AddEventListenerOptions
): void;
addEventListener(
type: string,
listener: EventListenerOrEventListenerObject,
options?: boolean | AddEventListenerOptions
): void;
addEventListener(type: string, listener: unknown, options?: unknown): void {
if (type === 'close' && typeof listener === 'function') {
this._closeListeners.add(listener);
const once = typeof options === 'object' && options !== null && 'once' in options ? !!(options as any).once : false;
this._virtualCloseListeners.push({ listener, once });
if (this._virtualCloseListeners.length === 1) {
this._registerNativeCloseHandler();
}
return;
}
this._ws.addEventListener(type as never, listener as never, options as never);
}
removeEventListener<K extends keyof WebSocketForceEventMap>(
type: K,
listener: (this: WebSocketForce, ev: WebSocketForceEventMap[K]) => unknown,
options?: boolean | EventListenerOptions
): void;
removeEventListener(
type: string,
listener: EventListenerOrEventListenerObject,
options?: boolean | EventListenerOptions
): void;
removeEventListener(type: string, listener: unknown, options?: unknown): void {
if (type === 'close' && typeof listener === 'function') {
this._closeListeners.delete(listener);
const index = this._virtualCloseListeners.findIndex(e => e.listener === listener);
if (index > -1) {
this._virtualCloseListeners.splice(index, 1);
}
if (this._virtualCloseListeners.length === 0) {
this._unregisterNativeCloseHandler();
}
return;
}
this._ws.removeEventListener(type as never, listener as never, options as never);
}
dispatchEvent(event: Event): boolean {
if (this._ws.dispatchEvent) {
return this._ws.dispatchEvent(event);
}
if (this._ws.emit) {
return this._ws.emit(event.type, event);
}
return false;
}
emit(event: string, ...args: any[]): boolean {
if (this._ws.emit) {
return this._ws.emit(event, ...args);
}
if (this._ws.dispatchEvent) {
const evt = new Event(event);
(evt as any).args = args;
return this._ws.dispatchEvent(evt);
}
return false;
}
on<K extends keyof WebSocketForceEventMap>(type: K, listener: (this: WebSocketForce, ev: WebSocketForceEventMap[K]) => unknown): this;
on(type: string, listener: EventListenerOrEventListenerObject): this;
on(type: string, listener: unknown): this {
this.addEventListener(type as never, listener as never);
return this;
}
off<K extends keyof WebSocketForceEventMap>(type: K, listener: (this: WebSocketForce, ev: WebSocketForceEventMap[K]) => unknown): this;
off(type: string, listener: EventListenerOrEventListenerObject): this;
off(type: string, listener: unknown): this {
this.removeEventListener(type as never, listener as never);
return this;
}
once<K extends keyof WebSocketForceEventMap>(
type: K
): Promise<WebSocketForceEventMap[K]>;
once(type: string): Promise<Event> {
if (type === 'close' && this.readyState === this.CLOSED) {
const immediateCloseEvent: CloseEvent = new CloseEvent('close', { code: 1000, reason: '', wasClean: true });
return Promise.resolve(immediateCloseEvent);
}
return new Promise((resolve) => {
const handler = (ev: Event) => {
this.removeEventListener(type, handler);
resolve(ev);
};
this.addEventListener(type, handler, { once: true });
});
}
forceClose(code: number = 1000, reason: string = 'Force closed'): void {
if (this._forceClosed) {
return;
}
this._forceClosed = true;
try {
const anyWs = this._ws as any;
if (typeof anyWs.forceClose === 'function') {
try { anyWs.forceClose(code, reason); } catch { }
}
this._ws.close(code, reason);
} catch { }
const closeEvent: CloseEvent = new CloseEvent('close', { code, reason, wasClean: false });
this._triggerVirtualCloseListeners(closeEvent);
}
setMaxListeners(n: number): void {
if ('setMaxListeners' in this._ws && typeof (this._ws as any).setMaxListeners === 'function') {
(this._ws as any).setMaxListeners(n);
}
}
}
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