Added Solutions

week-3/01-middlewares/01-requestcount.js

@@ -1,6 +1,6 @@
-const request = require('supertest');
-const assert = require('assert');
-const express = require('express');
+const request = require("supertest");
+const assert = require("assert");
+const express = require("express");
 
 const app = express();
 let requestCount = 0;
@@ -10,16 +10,16 @@ let requestCount = 0;
 // maintain a count of the number of requests made to the server in the global
 // requestCount variable
 
-app.get('/user', function(req, res) {
-  res.status(200).json({ name: 'john' });
+app.get("/user", function (req, res) {
+  res.status(200).json({ name: "john" });
 });
 
-app.post('/user', function(req, res) {
-  res.status(200).json({ msg: 'created dummy user' });
+app.post("/user", function (req, res) {
+  res.status(200).json({ msg: "created dummy user" });
 });
 
-app.get('/requestCount', function(req, res) {
+app.get("/requestCount", function (req, res) {
   res.status(200).json({ requestCount });
 });
 
-module.exports = app;
+module.exports = app;

week-3/01-middlewares/02-ratelimitter.js

@@ -1,6 +1,6 @@
-const request = require('supertest');
-const assert = require('assert');
-const express = require('express');
+const request = require("supertest");
+const assert = require("assert");
+const express = require("express");
 const app = express();
 // You have been given an express server which has a few endpoints.
 // Your task is to create a global middleware (app.use) which will
@@ -13,15 +13,15 @@ const app = express();
 
 let numberOfRequestsForUser = {};
 setInterval(() => {
-    numberOfRequestsForUser = {};
-}, 1000)
+  numberOfRequestsForUser = {};
+}, 1000);
 
-app.get('/user', function(req, res) {
-  res.status(200).json({ name: 'john' });
+app.get("/user", function (req, res) {
+  res.status(200).json({ name: "john" });
 });
 
-app.post('/user', function(req, res) {
-  res.status(200).json({ msg: 'created dummy user' });
+app.post("/user", function (req, res) {
+  res.status(200).json({ msg: "created dummy user" });
 });
 
-module.exports = app;
+module.exports = app;

week-3/01-middlewares/03-errorcount.js

@@ -1,6 +1,6 @@
-const request = require('supertest');
-const assert = require('assert');
-const express = require('express');
+const request = require("supertest");
+const assert = require("assert");
+const express = require("express");
 
 const app = express();
 let errorCount = 0;
@@ -10,17 +10,17 @@ let errorCount = 0;
 // 1. Ensure that if there is ever an exception, the end user sees a status code of 404
 // 2. Maintain the errorCount variable whose value should go up every time there is an exception in any endpoint
 
-app.get('/user', function(req, res) {
+app.get("/user", function (req, res) {
   throw new Error("User not found");
-  res.status(200).json({ name: 'john' });
+  res.status(200).json({ name: "john" });
 });
 
-app.post('/user', function(req, res) {
-  res.status(200).json({ msg: 'created dummy user' });
+app.post("/user", function (req, res) {
+  res.status(200).json({ msg: "created dummy user" });
 });
 
-app.get('/errorCount', function(req, res) {
+app.get("/errorCount", function (req, res) {
   res.status(200).json({ errorCount });
 });
 
-module.exports = app;
+module.exports = app;

week-3/01-middlewares/Solutions/01-requestcount.js

@@ -0,0 +1,32 @@
+const request = require("supertest");
+const assert = require("assert");
+const express = require("express");
+
+const app = express();
+let requestCount = 0;
+
+// You have been given an express server which has a few endpoints.
+// Your task is to create a global middleware (app.use) which will
+// maintain a count of the number of requests made to the server in the global
+// requestCount variable
+
+//Here's the Implementation for the logging the the number on every request made.
+app.use((req, res, next) => {
+  requestCount++;
+  console.log(requestCount);
+  next();
+});
+
+app.get("/user", function (req, res) {
+  res.status(200).json({ name: "john" });
+});
+
+app.post("/user", function (req, res) {
+  res.status(200).json({ msg: "created dummy user" });
+});
+
+app.get("/requestCount", function (req, res) {
+  res.status(200).json({ requestCount });
+});
+
+module.exports = app;

week-3/01-middlewares/Solutions/03-errorcount.js

@@ -0,0 +1,34 @@
+const request = require("supertest");
+const assert = require("assert");
+const express = require("express");
+
+const app = express();
+let errorCount = 0;
+
+// You have been given an express server which has a few endpoints.
+// Your task is to
+// 1. Ensure that if there is ever an exception, the end user sees a status code of 404
+// 2. Maintain the errorCount variable whose value should go up every time there is an exception in any endpoint
+
+app.get("/user", function (req, res) {
+  throw new Error("User not found");
+  // res.status(200).json({ name: "john" });
+});
+
+app.post("/user", function (req, res) {
+  res.status(200).json({ msg: "created dummy user" });
+});
+
+app.get("/errorCount", function (req, res) {
+  res.status(200).json({ errorCount });
+});
+
+app.use((err, req, res, next) => {
+  res.status(404).json({
+    status: err.status || 404,
+    msg: err.message || "An Error Occured.",
+  });
+  errorCount++;
+});
+
+module.exports = app;