unleash-server/dist/lib/middleware/request-logger.js

Unleash is an enterprise ready feature flag service. It provides different strategies for handling feature flags.

import url from 'url';
import { CLIENT_ERROR_COUNT, SERVER_ERROR_COUNT, } from '../features/metrics/impact/define-impact-metrics.js';
const requestLogger = (config) => {
    const logger = config.getLogger('HTTP');
    const requestLoggerEnabled = config.server.enableRequestLogger;
    const impactMetrics = config.flagResolver.impactMetrics;
    return (req, res, next) => {
        const impactMetricsEnabled = config.flagResolver.isEnabled('impactMetrics');
        res.on('finish', () => {
            if (impactMetricsEnabled && impactMetrics) {
                if (res.statusCode >= 400 && res.statusCode < 500) {
                    impactMetrics.incrementCounter(CLIENT_ERROR_COUNT);
                }
                if (res.statusCode >= 500) {
                    impactMetrics.incrementCounter(SERVER_ERROR_COUNT);
                }
            }
            if (requestLoggerEnabled) {
                const { pathname } = url.parse(req.originalUrl);
                logger.info(`${res.statusCode} ${req.method} ${pathname}`);
            }
        });
        next();
    };
};
export default requestLogger;
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