import { Router, NextFunction, Request, Response } from "express";
import createError from 'http-errors';
import { register } from 'prom-client';
import { createLogger } from '../lib/logger';

const logger = createLogger("server:metrics");

export const metricsRouter = Router();

metricsRouter.get('/', async (req:Request, res:Response, next:NextFunction) => {
    // ne mogu dopustiti da prometheus client sruši server
    try {
        logger(`⚡️[server]: GET /metrics`);
        res.set('Content-Type', register.contentType);
        res.end(await register.metrics());
    } catch(ex:any) {
        next(createError(500, (ex as Error).message));
    }
});