"use strict";

class ServerSentEventStream {
	constructor(response) {
		this.response = response;
		this.next_id = 0;
		
		this.response.writeHead(200, {
			"content-type": "text/event-stream",
			"cache-control": "no-store"
		});
		this.response.flushHeaders();
	}
	
	write(event_name, data) {
		this.response.write(`id: ${this.next_id++}\n`);
		this.response.write(`event: ${event_name}\n`);
		this.response.write(`data: ${data}\n\n`);
	}
	
	write_json(event_name, data_obj) {
		return this.write(event_name, JSON.stringify(data_obj));
	}
}

export default ServerSentEventStream;