logging.ts

import express from 'express';
import { logger } from '../utils/logging';

export const logging = (
    req: express.Request,
    res: express.Response,
    next: express.NextFunction,
): void => {
    const startTime = process.hrtime();

    res.on('finish', () => {
        const [seconds, nanoseconds] = process.hrtime(startTime);
        const responseTimeMs = seconds * 1000 + nanoseconds / 1e6;

        logger.info({
            status: res.statusCode,
            method: req.method,
            path: req.path,
            didRenderEpic: res.locals.didRenderEpic,
            didRenderBanner: res.locals.didRenderBanner,
            bannerTargeting: res.locals.bannerTargeting,
            epicTargeting: res.locals.epicTargeting,
            userAgent: isServerError(res.statusCode) ? req.headers['user-agent'] : undefined,
            epicSuperMode: res.locals.epicSuperMode,
            responseTimeMs: Math.round(responseTimeMs),
        });
    });
    next();
};

const isServerError = (statusCode: number) => statusCode >= 500;