adding rates limiter example

Author: jkyberneees

demos/rate-limit.js

@@ -0,0 +1,30 @@
+const gateway = require('../index')
+const rateLimit = require('express-rate-limit')
+const requestIp = require('request-ip')
+
+gateway({
+  middlewares: [
+    // acquire request IP
+    (req, res, next) => {
+      req.ip = requestIp.getClientIp(req)
+      return next()
+    },
+    // rate limiter
+    rateLimit({
+      windowMs: 1 * 60 * 1000, // 1 minutes
+      max: 60, // limit each IP to 60 requests per windowMs
+      handler: (req, res) => {
+        res.send('Too many requests, please try again later.', 429)
+      }
+    })
+  ],
+  routes: [{
+    prefix: '/public',
+    target: 'http://localhost:3000'
+  }]
+}).start(8080).then(() => console.log('API Gateway listening on 8080 port!'))
+
+const service = require('restana')({})
+service
+  .get('/hi', (req, res) => res.send('Hello World!'))
+  .start(3000).then(() => console.log('Public service listening on 3000 port!'))

package-lock.json

@@ -35,10 +35,12 @@
     "chai": "^4.2.0",
     "cors": "^2.8.5",
     "express-jwt": "^5.3.1",
+    "express-rate-limit": "^5.0.0",
     "helmet": "^3.21.2",
     "mocha": "^6.2.2",
     "nyc": "^14.1.1",
     "opossum": "^4.2.1",
+    "request-ip": "^2.1.3",
     "response-time": "^2.3.2",
     "standard": "^14.3.1",
     "supertest": "^4.0.2"