Merge branch 'master' into node-errorhandling

2022-03-30 11:04:29 +05:30
parent 2223be80c9 1f37a81b90
commit 041442297e
74 changed files with 5123 additions and 0 deletions
--- a/nodejs/middleware/app.ts
+++ b/nodejs/middleware/app.ts
@@ -0,0 +1,118 @@
+import express, { Request, Response, NextFunction } from 'express'
+import morgan from 'morgan'
+
+const app = express()
+const port:number = 3000
+
+
+interface Product {
+
+    name: string
+    price: number
+    brand: string
+    category?: string
+  }
+
+interface ProductCreationResponse {
+    productID: string 
+    result: string
+} 
+
+
+class AppError extends Error{
+    statusCode: number;
+
+    constructor(statusCode: number, message: string) {
+      super(message);
+  
+      Object.setPrototypeOf(this, new.target.prototype);
+      this.name = Error.name;
+      this.statusCode = statusCode;
+      Error.captureStackTrace(this);
+    }
+}
+
+const requestLogger = (request: Request, response: Response, next: NextFunction) => {
+    console.log(`${request.method} url:: ${request.url}`);
+    next()
+}
+
+app.use(express.static('images'))  
+app.use(express.static('htmls'))  
+app.use(requestLogger)  
+
+app.use(morgan('tiny'))
+
+app.use('/products', express.json({ limit: 100 }))
+
+// Error handling Middleware functions
+const errorLogger = (error: Error, request: Request, response: Response, next: NextFunction) => {
+    console.log( `error ${error.message}`) 
+    next(error) // calling next middleware
+  }
+  
+  const errorResponder = (error: AppError, request: Request, response: Response, next: NextFunction) => {
+  response.header("Content-Type", 'application/json')
+    
+  const status = error.statusCode || 400
+  response.status(status).send(error.message)
+  }
+  const invalidPathHandler = (request: Request, response: Response, next: NextFunction) => {
+  response.status(400)
+  response.send('invalid path')
+  }
+  
+  
+  
+  app.get('product', (request: Request, response: Response)=>{
+    response.sendFile("productsample.html")
+  })
+  
+  // handle get request for path /
+  app.get('/', (request: Request, response: Response) => {
+      response.send('response for GET request');
+  })
+  
+  
+  const requireJsonContent = (request: Request, response: Response, next: NextFunction) => {
+    if (request.headers['content-type'] !== 'application/json') {
+        response.status(400).send('Server requires application/json')
+    } else {
+      next()
+    }
+  }
+
+
+const addProducts = (request: Request, response: Response, next: NextFunction) => {
+    let products: Product[] = []
+
+    const name: string = request.body.name                
+  
+    const brand: string = request.body.brand
+  
+    const category: string = request.body.category
+  
+    console.log(name + " " + brand)
+    
+    products.push({name: request.body.name, brand: request.body.brand, price: request.body.price})              
+   
+    const productCreationResponse: ProductCreationResponse = {productID: "12345", result: "success"}
+    response.json(productCreationResponse)
+
+    response.status(200).json(products);
+}
+app.post('/products', addProducts)
+
+app.get('/productswitherror', (request: Request, response: Response) => {
+    let error: AppError = new AppError(400, `processing error in request at ${request.url}`)
+    
+    throw error
+  })
+  
+  app.use(errorLogger)
+  app.use(errorResponder)
+  app.use(invalidPathHandler)
+
+app.listen(port, () => {
+    console.log(`Server listening at port ${port}.`)
+})
--- a/nodejs/middleware/htmls/productsample.html
+++ b/nodejs/middleware/htmls/productsample.html
@@ -0,0 +1,6 @@
+<html>
+<body>
+    <h2>My sample product page</h2>
+    <img src="sample.jpg" alt="sample"></img>
+</body>
+</html>
--- a/nodejs/middleware/images/sample.jpg
+++ b/nodejs/middleware/images/sample.jpg
--- a/nodejs/middleware/index.js
+++ b/nodejs/middleware/index.js
@@ -0,0 +1,89 @@
+const express = require('express')
+const morgan = require('morgan')
+
+const app = express();
+
+
+const requestLogger = (request, response, next) => {
+    console.log(`${request.method} url:: ${request.url}`);
+    next()
+}
+
+app.use(express.static('images'))  
+app.use(express.static('htmls'))  
+
+app.use(requestLogger)  
+
+app.use(morgan('tiny'))
+
+app.use('/products', express.json({ limit: 100 }))
+
+// Error handling Middleware functions
+const errorLogger = (error, request, response, next) => {
+  console.log( `error ${error.message}`) 
+  next(error) // calling next middleware
+}
+
+const errorResponder = (error, request, response, next) => {
+response.header("Content-Type", 'application/json')
+  
+const status = error.status || 400
+response.status(status).send(error.message)
+}
+const invalidPathHandler = (request, response, next) => {
+response.status(400)
+response.send('invalid path')
+}
+
+
+
+app.get('product', (request, response)=>{
+  response.sendFile("productsample.html")
+})
+
+// handle get request for path /
+app.get('/', (request, response) => {
+    response.send('response for GET request');
+})
+
+
+const requireJsonContent = (request, response, next) => {
+  if (request.headers['content-type'] !== 'application/json') {
+      response.status(400).send('Server requires application/json')
+  } else {
+    next()
+  }
+}
+
+// handle post request for path /products
+app.post('/products', requireJsonContent, (request, response) => {
+  const products = []
+
+  const name = request.body.name                
+
+  const brand = request.body.brand
+
+  const category = request.body.category
+
+  console.log(name + " " + brand)
+  
+  products.push({name: request.body.name, brand: request.body.brand, price: request.body.price})              
+ 
+  const productCreationResponse = {productID: "12345", result: "success"}
+  response.json(productCreationResponse)
+})
+
+app.get('/productswitherror', (request, response) => {
+  let error = new Error(`processing error in request at ${request.url}`)
+  error.statusCode = 400
+  throw error
+})
+
+app.use(errorLogger)
+app.use(errorResponder)
+app.use(invalidPathHandler)
+
+const port = 3000
+app.listen(3000, 
+     () => console.log(`Server listening on port ${port}.`));
+   
--- a/nodejs/middleware/package-lock.json
+++ b/nodejs/middleware/package-lock.json
--- a/nodejs/middleware/package.json
+++ b/nodejs/middleware/package.json
@@ -0,0 +1,22 @@
+{
+  "name": "storefront1",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "express": "^4.17.3",
+    "morgan": "^1.10.0"
+  },
+  "devDependencies": {
+    "@types/express": "^4.17.13",
+    "@types/node": "^17.0.21",
+    "ts-node": "^10.7.0",
+    "typescript": "^4.6.2"
+  }
+}
--- a/nodejs/middleware/tsconfig.json
+++ b/nodejs/middleware/tsconfig.json
@@ -0,0 +1,8 @@
+{
+    "compilerOptions": {
+      "module": "commonjs",
+      "target": "es6",
+      "rootDir": "./",
+      "esModuleInterop": true
+    }
+  }