feat: add logger

lib/app-server.js

@@ -13,6 +13,7 @@ const EventEmitter = require('events');
 const bodyParser = require('body-parser');
 const RateLimit = require('express-rate-limit');
 const poweredBy = require('../middlewares/powered-by');
+const logger = require('../middlewares/logger');
 const cors = require('../middlewares/cors');
 const errors = require('../middlewares/errors');
 const swaggerRoute = require('./swagger-route');
@@ -85,6 +86,7 @@ class RestServer extends EventEmitter {
             }
 
             const bodySizeLimit = options.bodySizeLimit || '10mb';
+            this._app.use(logger(this));
             this._app.use(cors); // CORS middleware
             this._app.use(bodyParser.raw({ limit: bodySizeLimit }));
             this._app.use(bodyParser.json({ limit: bodySizeLimit }));

middlewares/logger.js

@@ -0,0 +1,16 @@
+
+const now = require('performance-now');
+
+const logger = emitter => (req, res, next) => {
+    const start = now();
+    const { method, url } = req.method;
+    res.on('finish', () => {
+        const end = now();
+        const status = res.statusCode;
+        const duration = (start - end).toFixed(2);
+        emitter.emit('request', { method, url, status, duration });
+    });
+    next();
+};
+
+module.exports = logger;

middlewares/powered-by.js

@@ -3,9 +3,9 @@
  * X-Powered-By middleware
  */
 
-const powered = (poweredBy) => (req, res, next) => {
+const powered = poweredBy => (req, res, next) => {
     res.setHeader('X-Powered-By', poweredBy);
     next();
 };
 
-module.exports = powered;
+module.exports = powered;

package.json

@@ -11,6 +11,7 @@
     "fs-extra": "^9.0.1",
     "js-yaml": "^4.0.0",
     "json-refs": "^3.0.15",
+    "performance-now": "^2.1.0",
     "swagger-parser": "^10.0.2"
   },
   "devDependencies": {