org.crazydoctor.dzjsdocs/static/websocket/Socket.js

class Socket {
	constructor(path) {
		const url = this.url = new Url();
		
		if(url.getProtocol() === 'https:')
			url.setProtocol('wss');
		else
			url.setProtocol('ws');

		url.setPath(path).setHash();

		try {
			this.connection = new WebSocket(url.toString());
			
			this.keepAlive = setInterval(() => {
				this.connection.send('keep-alive');
			}, 20000);
	
			this.connection.onclose = (e) => {
				clearInterval(this.keepAlive);
			};
		} catch(e) {
			this.connection = null;
		}
	}

	onOpen(onopen) {
		if(this.connection)
			this.connection.onopen = onopen;
		return this;
	}

	onMessage(onmessage) {
		if(this.connection)
			this.connection.onmessage = onmessage;
		return this;
	}

	onError(onerror) {
		if(this.connection)
			this.connection.onerror = onerror;
		return this;
	}

	onClose(onclose) {
		if(this.connection)
			this.connection.onclose = (e) => {
				clearInterval(this.keepAlive);
				onclose(e);
			};
		return this;
	}
}