Merge pull request #1

work-branch

.gitignore

@@ -1,5 +1,6 @@
 # Compiled class file
 *.class
+.vscode
 
 # Log file
 *.log

README.md

@@ -1 +1,6 @@
-# microservices-playground
+# microservices-playground
+In this repo, I wish to create different microservices test projects. create docker images and orchestrate using K8s.
+
+
+# References  
+- https://minikube.sigs.k8s.io/docs/start/

example-base-01/Readme.md

@@ -0,0 +1,26 @@
+# Example base 01
+It contains folder structure as follows
+```
+example-base-01 ==base folder
+|- backend = root for all backend services
+|- frontend = root for frontend project. In this example we have single frontend project. It communicates with microservices,
+|- nginx.conf = 
+```
+
+# docker compose with custom yml file
+ ## to build
+ ```
+ docker-compose -f docker-compose-with-networks.yml build --no-cache
+ ```
+ ## to up
+ ```
+ docker-compose -f docker-compose-with-networks.yml up
+ ```
+
+# Frontend development
+ ## To initialize a React.js project directly inside the "frontend" folder without creating any subfolders 
+ ```
+ npx create-react-app .
+ ```
+
+ This command will initialize a new React.js project directly in the "frontend" folder without creating any subfolders.

example-base-01/backend/topic/.dockerignore

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+node_modules
+# npm-debug.log

example-base-01/backend/topic/.env

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+FRONTEND_SERVICE_URL= http://localhost:3002

example-base-01/backend/topic/.gitignore

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+# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
+
+# dependencies
+/node_modules
+/.pnp
+.pnp.js
+
+# testing
+/coverage
+
+# production
+/build
+
+# misc
+.DS_Store
+.env.local
+.env.development.local
+.env.test.local
+.env.production.local
+
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+package-lock.json

example-base-01/backend/topic/Dockerfile

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+# Use an official Node runtime as the base image
+FROM node:lts-buster-slim AS development
+
+# Set the working directory in the container
+WORKDIR /app
+
+# Copy package.json and package-lock.json to the working directory
+COPY package*.json ./
+
+# Install dependencies
+RUN npm install --force
+
+# Copy the entire project to the working directory
+COPY . .
+
+# Expose port 3000 to the outside world
+EXPOSE 3000
+
+# Command to run the application
+CMD ["npm", "start"]

example-base-01/backend/topic/package.json

@@ -0,0 +1,29 @@
+{
+  "name": "topic",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1",
+    "start": "nodemon src/server.js"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "ejs": "^3.1.10",
+    "express": "^4.19.2",
+    "bcrypt": "^5.1.1",
+    "body-parser": "^1.20.2",
+    "cors": "^2.8.5",
+    "jsonwebtoken": "^9.0.2",
+    "mongoose": "^7.6.5",
+    "mysql": "^2.18.1",
+    "swagger-jsdoc": "^6.2.8",
+    "swagger-ui-express": "^5.0.0",
+    "uuid": "^9.0.1"
+  },
+  "devDependencies": {
+    "nodemon": "^3.0.1"
+  }
+}

example-base-01/backend/topic/src/server.js

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+const express = require('express');
+const app = express();
+const port = 3000; // You can change this if needed
+const path = require('path');
+
+// Set the view engine to EJS
+app.set('view engine', 'ejs');
+// Set the directory for views
+app.set('views', path.join(__dirname, 'views'));
+
+// Define the frontend service URL
+const frontendServiceUrl = process.env.FRONTEND_SERVICE_URL || 'http://localhost:3002';
+
+// Middleware to set CORS headers
+app.use((req, res, next) => {
+    // Allow requests from frontend service origin
+    res.setHeader('Access-Control-Allow-Origin', frontendServiceUrl); // Externalized URL
+    res.setHeader('Access-Control-Allow-Methods', 'GET, POST, PUT, DELETE'); // Allow specific HTTP methods
+    res.setHeader('Access-Control-Allow-Headers', 'Content-Type, Authorization'); // Allow specific headers
+    next();
+});
+
+// Define your routes
+app.get('/', (req, res) => {
+    console.log(`process.env.FRONTEND_SERVICE_URL : ${process.env.FRONTEND_SERVICE_URL}`);
+    res.render('index', {frontendServiceUrl:process.env.FRONTEND_SERVICE_URL});
+});
+
+app.get('/topics', (req, res) => {
+    console.log(`process.env.FRONTEND_SERVICE_URL : ${process.env.FRONTEND_SERVICE_URL}`);
+    const topics = ['Node.js', 'Express', 'JavaScript', 'EJS'];
+    res.json({ topics });
+});
+
+// Start the server
+app.listen(port, () => {
+    console.log(`Topics Server is running on http://localhost:${port}`);
+});

example-base-01/backend/topic/src/views/index.ejs

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+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>Welcome</title>
+</head>
+<body>
+    <h1>Welcome to Topics microservice</h1>
+    <h2><%= frontendServiceUrl %></h2>
+</body>
+</html>

example-base-01/backend/word/.dockerignore

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+node_modules
+# npm-debug.log

example-base-01/backend/word/.env

@@ -0,0 +1 @@
+FRONTEND_SERVICE_URL= http://localhost:3002

example-base-01/backend/word/.gitignore

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+# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
+
+# dependencies
+/node_modules
+/.pnp
+.pnp.js
+
+# testing
+/coverage
+
+# production
+/build
+
+# misc
+.DS_Store
+.env.local
+.env.development.local
+.env.test.local
+.env.production.local
+
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+package-lock.json

example-base-01/backend/word/Dockerfile

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+# Use an official Node runtime as the base image
+FROM node:lts-buster-slim AS development
+
+# Set the working directory in the container
+WORKDIR /app
+
+# Copy package.json and package-lock.json to the working directory
+COPY package*.json ./
+
+# Install dependencies
+RUN npm install --force
+
+# Copy the entire project to the working directory
+COPY . .
+
+# Expose port 3000 to the outside world
+EXPOSE 3000
+
+# Command to run the application
+CMD ["npm", "start"]

example-base-01/backend/word/package.json

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+{
+  "name": "word",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1",
+    "start": "nodemon src/server.js"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "ejs": "^3.1.10",
+    "express": "^4.19.2",
+    "bcrypt": "^5.1.1",
+    "body-parser": "^1.20.2",
+    "cors": "^2.8.5",
+    "jsonwebtoken": "^9.0.2",
+    "mongoose": "^7.6.5",
+    "mysql": "^2.18.1",
+    "swagger-jsdoc": "^6.2.8",
+    "swagger-ui-express": "^5.0.0",
+    "uuid": "^9.0.1"
+  },
+  "devDependencies": {
+    "nodemon": "^3.0.1"
+  }
+}

example-base-01/backend/word/src/server.js

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+const express = require('express');
+const app = express();
+const port = 3001; // You can change this if needed
+const path = require('path');
+
+// Set the view engine to EJS
+app.set('view engine', 'ejs');
+// Set the directory for views
+app.set('views', path.join(__dirname, 'views'));
+
+// Define the frontend service URL
+const frontendServiceUrl = process.env.FRONTEND_SERVICE_URL || 'http://localhost:3002';
+
+// Middleware to set CORS headers
+app.use((req, res, next) => {
+    // Allow requests from frontend service origin
+    res.setHeader('Access-Control-Allow-Origin', frontendServiceUrl); // Externalized URL
+    res.setHeader('Access-Control-Allow-Methods', 'GET, POST, PUT, DELETE'); // Allow specific HTTP methods
+    res.setHeader('Access-Control-Allow-Headers', 'Content-Type, Authorization'); // Allow specific headers
+    next();
+});
+
+// Define your routes
+app.get('/', (req, res) => {
+    console.log(`process.env.FRONTEND_SERVICE_URL : ${process.env.FRONTEND_SERVICE_URL}`);
+    res.render('index', {frontendServiceUrl:process.env.FRONTEND_SERVICE_URL});
+});
+
+app.get('/words', (req, res) => {
+    console.log(`process.env.FRONTEND_SERVICE_URL : ${process.env.FRONTEND_SERVICE_URL}`);
+    const words = ['Apple', 'Banana', 'Car', 'Donkey'];
+    res.json({ words });
+});
+
+// Start the server
+app.listen(port, () => {
+    console.log(`Words Server is running on http://localhost:${port}`);
+});

example-base-01/backend/word/src/views/index.ejs

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+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>Welcome</title>
+</head>
+<body>
+    <h1>Welcome to Words microservice</h1>
+
+    <h2><%= frontendServiceUrl %></h2>
+</body>
+</html>

example-base-01/docker-compose-basic.yml

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+version: '3'
+
+services:
+  nginx:
+    image: nginx:latest
+    ports:
+      - "80:80"
+    volumes:
+      - ./nginx.conf:/etc/nginx/nginx.conf
+    depends_on:
+      - topics
+      - words
+
+  topics:
+    build: ./backend/topic
+    ports:
+      - "3000:3000"
+
+  words:
+    build: ./backend/word
+    ports:
+      - "3001:3001"
+
+  frontend:
+    build: ./frontend
+    ports:
+      - "3002:3002"
+    environment:
+      - PORT= 3002

example-base-01/docker-compose-with-networks.yml

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+version: '3'
+
+services:
+  nginx:
+    image: nginx:latest
+    ports:
+      - "80:80"
+    volumes:
+      - ./nginx.conf:/etc/nginx/nginx.conf
+    networks:
+      - my_network
+    depends_on:
+      - topics
+      - words
+
+  topics:
+    build: ./backend/topic
+    networks:
+      - my_network
+
+  words:
+    build: ./backend/word
+    networks:
+      - my_network
+
+  frontend:
+    build: ./frontend
+    ports:
+      - "3002:3002"
+    environment:
+      - PORT= 3002
+    networks:
+      - my_network
+
+networks:
+  my_network:
+    driver: bridge