Initial commit

blog/client/.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*

blog/client/README.md

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+# Getting Started with Create React App
+
+This project was bootstrapped with [Create React App](https://github.com/facebook/create-react-app).
+
+## Available Scripts
+
+In the project directory, you can run:
+
+### `npm start`
+
+Runs the app in the development mode.\
+Open [http://localhost:3000](http://localhost:3000) to view it in the browser.
+
+The page will reload if you make edits.\
+You will also see any lint errors in the console.
+
+### `npm test`
+
+Launches the test runner in the interactive watch mode.\
+See the section about [running tests](https://facebook.github.io/create-react-app/docs/running-tests) for more information.
+
+### `npm run build`
+
+Builds the app for production to the `build` folder.\
+It correctly bundles React in production mode and optimizes the build for the best performance.
+
+The build is minified and the filenames include the hashes.\
+Your app is ready to be deployed!
+
+See the section about [deployment](https://facebook.github.io/create-react-app/docs/deployment) for more information.
+
+### `npm run eject`
+
+**Note: this is a one-way operation. Once you `eject`, you can’t go back!**
+
+If you aren’t satisfied with the build tool and configuration choices, you can `eject` at any time. This command will remove the single build dependency from your project.
+
+Instead, it will copy all the configuration files and the transitive dependencies (webpack, Babel, ESLint, etc) right into your project so you have full control over them. All of the commands except `eject` will still work, but they will point to the copied scripts so you can tweak them. At this point you’re on your own.
+
+You don’t have to ever use `eject`. The curated feature set is suitable for small and middle deployments, and you shouldn’t feel obligated to use this feature. However we understand that this tool wouldn’t be useful if you couldn’t customize it when you are ready for it.
+
+## Learn More
+
+You can learn more in the [Create React App documentation](https://facebook.github.io/create-react-app/docs/getting-started).
+
+To learn React, check out the [React documentation](https://reactjs.org/).
+
+### Code Splitting
+
+This section has moved here: [https://facebook.github.io/create-react-app/docs/code-splitting](https://facebook.github.io/create-react-app/docs/code-splitting)
+
+### Analyzing the Bundle Size
+
+This section has moved here: [https://facebook.github.io/create-react-app/docs/analyzing-the-bundle-size](https://facebook.github.io/create-react-app/docs/analyzing-the-bundle-size)
+
+### Making a Progressive Web App
+
+This section has moved here: [https://facebook.github.io/create-react-app/docs/making-a-progressive-web-app](https://facebook.github.io/create-react-app/docs/making-a-progressive-web-app)
+
+### Advanced Configuration
+
+This section has moved here: [https://facebook.github.io/create-react-app/docs/advanced-configuration](https://facebook.github.io/create-react-app/docs/advanced-configuration)
+
+### Deployment
+
+This section has moved here: [https://facebook.github.io/create-react-app/docs/deployment](https://facebook.github.io/create-react-app/docs/deployment)
+
+### `npm run build` fails to minify
+
+This section has moved here: [https://facebook.github.io/create-react-app/docs/troubleshooting#npm-run-build-fails-to-minify](https://facebook.github.io/create-react-app/docs/troubleshooting#npm-run-build-fails-to-minify)

blog/client/package.json

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+{
+  "name": "client",
+  "version": "0.1.0",
+  "private": true,
+  "dependencies": {
+    "@testing-library/jest-dom": "^5.14.1",
+    "@testing-library/react": "^11.2.7",
+    "@testing-library/user-event": "^12.8.3",
+    "axios": "^0.21.1",
+    "react": "^17.0.2",
+    "react-dom": "^17.0.2",
+    "react-scripts": "4.0.3",
+    "web-vitals": "^1.1.2"
+  },
+  "scripts": {
+    "start": "react-scripts start",
+    "build": "react-scripts build",
+    "test": "react-scripts test",
+    "eject": "react-scripts eject"
+  },
+  "eslintConfig": {
+    "extends": [
+      "react-app",
+      "react-app/jest"
+    ]
+  },
+  "browserslist": {
+    "production": [
+      ">0.2%",
+      "not dead",
+      "not op_mini all"
+    ],
+    "development": [
+      "last 1 chrome version",
+      "last 1 firefox version",
+      "last 1 safari version"
+    ]
+  }
+}

blog/client/public/index.html

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+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="utf-8" />
+    <link rel="icon" href="%PUBLIC_URL%/favicon.ico" />
+
+    <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@4.6.0/dist/css/bootstrap.min.css" integrity="sha384-B0vP5xmATw1+K9KRQjQERJvTumQW0nPEzvF6L/Z6nronJ3oUOFUFpCjEUQouq2+l" crossorigin="anonymous">
+
+    <meta name="viewport" content="width=device-width, initial-scale=1" />
+    <meta name="theme-color" content="#000000" />
+    <meta
+      name="description"
+      content="Web site created using create-react-app"
+    />
+    <link rel="apple-touch-icon" href="%PUBLIC_URL%/logo192.png" />
+    <!--
+      manifest.json provides metadata used when your web app is installed on a
+      user's mobile device or desktop. See https://developers.google.com/web/fundamentals/web-app-manifest/
+    -->
+    <link rel="manifest" href="%PUBLIC_URL%/manifest.json" />
+    <!--
+      Notice the use of %PUBLIC_URL% in the tags above.
+      It will be replaced with the URL of the `public` folder during the build.
+      Only files inside the `public` folder can be referenced from the HTML.
+
+      Unlike "/favicon.ico" or "favicon.ico", "%PUBLIC_URL%/favicon.ico" will
+      work correctly both with client-side routing and a non-root public URL.
+      Learn how to configure a non-root public URL by running `npm run build`.
+    -->
+    <title>React App</title>
+  </head>
+  <body>
+    <noscript>You need to enable JavaScript to run this app.</noscript>
+    <div id="root"></div>
+    <!--
+      This HTML file is a template.
+      If you open it directly in the browser, you will see an empty page.
+
+      You can add webfonts, meta tags, or analytics to this file.
+      The build step will place the bundled scripts into the <body> tag.
+
+      To begin the development, run `npm start` or `yarn start`.
+      To create a production bundle, use `npm run build` or `yarn build`.
+    -->
+  </body>
+</html>

blog/client/public/manifest.json

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+{
+  "short_name": "React App",
+  "name": "Create React App Sample",
+  "icons": [
+    {
+      "src": "favicon.ico",
+      "sizes": "64x64 32x32 24x24 16x16",
+      "type": "image/x-icon"
+    },
+    {
+      "src": "logo192.png",
+      "type": "image/png",
+      "sizes": "192x192"
+    },
+    {
+      "src": "logo512.png",
+      "type": "image/png",
+      "sizes": "512x512"
+    }
+  ],
+  "start_url": ".",
+  "display": "standalone",
+  "theme_color": "#000000",
+  "background_color": "#ffffff"
+}

blog/client/public/robots.txt

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+# https://www.robotstxt.org/robotstxt.html
+User-agent: *
+Disallow:

blog/client/src/App.js

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+import React from 'react'; 
+import PostCreate from './PostCreate';
+import PostList from './PostList';
+
+const App = () => {
+  return <div className="container">
+    <h1>Create Post</h1>
+    <PostCreate/>
+
+    <hr/>
+
+    <h1>Posts</h1>
+    <PostList/>
+  </div>;
+};
+
+export default App;

blog/client/src/CommentCreate.js

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+import React, { useState } from 'react';
+import axios from 'axios';
+
+const CommentCreate = ({postID}) => {
+  const [content, setContent] = useState('');
+
+  const onSubmit = async (e) => { 
+    e.preventDefault();
+    await axios.post(`http://localhost:4001/posts/${postID}/comments`, { content });
+    setContent('');
+  };
+
+  return <div>
+    <form onSubmit={onSubmit}>
+      <div className="form-group">
+        <label>New Comment</label>
+        <input className="form-control" onChange={e => setContent(e.target.value)} value={content}/>
+      </div>
+      <button className="btn btn-primary">Submit</button>
+    </form>
+  </div>;
+}
+
+export default CommentCreate;

blog/client/src/CommentList.js

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+import React from 'react';
+
+const CommentList = ({comments}) => {
+  const renderedComments = Object.values(comments).map(comment => {
+    let content;
+
+    if(comment.status === 'approved') {
+      content = comment.content;
+    } else if (comment.status === 'pending') {
+      content = 'This comment is awaiting moderation';
+    } else if (comment.status === 'rejected') {
+      content = 'This comment has been rejected';
+    }
+
+
+    return <li key={comment.id}>{content}</li>
+  });
+
+  return <ul>
+    {renderedComments}
+  </ul>;
+}
+
+export default CommentList;

blog/client/src/PostCreate.js

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+import React, { useState } from 'react';
+import axios from 'axios';
+
+const PostCreate = () => {
+  const [title, setTitle] = useState('');
+
+  const onSubmit = async (e) => { 
+    e.preventDefault();
+    
+    await axios.post('http://localhost:4000/posts', { title });
+
+    setTitle('');
+  };
+
+  return <div>
+    <form onSubmit={onSubmit}>
+      <div className="form-group">
+        <label>Title</label>
+        <input className="form-control" onChange={e => setTitle(e.target.value)} value={title}/>
+      </div>
+      <button className="btn btn-primary">Submit</button>
+    </form>
+  </div>;
+}
+
+export default PostCreate;

blog/client/src/PostList.js

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+import React, { useState, useEffect } from 'react';
+import axios from 'axios';
+import CommentCreate from './CommentCreate';
+import CommentList from './CommentList';
+
+const PostList = () => {
+
+  const [posts, setPosts] = useState({});
+
+  const fetchPosts = async () => {
+    try {
+      const res = await axios.get('http://localhost:4002/posts');
+      setPosts(res.data);
+    } catch (error) { 
+      console.error(error);
+    }
+  };
+
+  useEffect(() => { fetchPosts(); }, []);
+
+  const renderedPosts = Object.values(posts).map(post => {
+    return <div className="card" style={{ width: '30%', marginBottom: '20px'}} key={post.id}>
+      <div className="card-body">
+        <h3>{post.title}</h3>
+        <CommentList comments={post.comments}/>
+        <CommentCreate postID={post.id}/>
+      </div>
+    </div>
+  });
+
+  return <div className="d-flex flex-row flex-wrap justify-content-between">
+    {renderedPosts}
+  </div>;
+}
+
+export default PostList;

blog/client/src/index.js

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+import React from 'react';
+import ReactDOM from 'react-dom';
+import App from './App';
+
+ReactDOM.render(
+  <App/>, document.getElementById('root')
+);

blog/comments/.gitignore

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+node_modules/

blog/comments/index.js

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+const { randomBytes } = require('crypto');
+const express = require('express');
+const bodyParser = require('body-parser');
+const cors = require('cors');
+const axios = require('axios');
+
+const app = express();
+app.use(bodyParser.json());
+app.use(cors());
+
+const commentsByPostID = {};
+
+app.get('/posts/:id/comments', (req, res) => {
+  res.send(commentsByPostID[req.params.id] || []);
+});
+
+app.post('/posts/:id/comments', async (req, res) => {
+  const commentID = randomBytes(4).toString('hex'); 
+  const { content } = req.body;
+
+  const comments = commentsByPostID[req.params.id] ||  [];
+
+  comments.push({ id: commentID, content, status: 'pending' })
+  
+  commentsByPostID[req.params.id] = comments;
+
+  await axios.post('http://localhost:4005/events', {
+    type: 'CommentCreated',
+    data: {
+      id: commentID, content, postId: req.params.id, status: 'pending'
+    }
+  }).catch(error => console.log(error));
+
+  res.status(201).send(comments);
+});
+
+app.post('/events', async (req, res) => {
+  console.log('Received Event', req.body.type);
+  const { type, data } = req.body;
+
+  if(type === 'CommentModerated') {
+    const { postId, id, status, content } = data;
+    const comments = commentsByPostID[postId];
+    const comment = comments.find(comment => comment.id === id);
+    comment.status = status;
+
+    await axios.post('http://localhost:4005/events', {
+      type: 'CommentUpdated',
+      data: { id, status, postId, content }
+    }).catch(error => console.log(error));
+  }
+
+  res.send({});
+});
+
+app.listen(4001, () => {
+  console.log('Listening on 4001');
+});

blog/comments/package.json

@@ -0,0 +1,18 @@
+{
+  "name": "comments",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "start": "nodemon index.js"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "axios": "^0.21.1",
+    "cors": "^2.8.5",
+    "express": "^4.17.1",
+    "nodemon": "^2.0.7"
+  }
+}

blog/event-bus/.gitignore

@@ -0,0 +1 @@
+node_modules/

blog/event-bus/index.js

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+const express = require('express');
+const bodyParser = require('body-parser');
+const axios = require('axios');
+
+const app = express();
+app.use(bodyParser.json());
+
+const events = [];
+
+app.post('/events', (req, res) => {
+  const event = req.body;
+
+  events.push(event);
+
+  axios.post('http://localhost:4000/events', event).catch(error => console.log(error));
+  axios.post('http://localhost:4001/events', event).catch(error => console.log(error));
+  axios.post('http://localhost:4002/events', event).catch(error => console.log(error));
+  axios.post('http://localhost:4003/events', event).catch(error => console.log(error));
+
+  res.send({status: 'OK'});
+});
+
+app.get('/events', (req, res) => {
+  res.send(events);
+});
+
+
+app.listen(4005, () => {
+  console.log('Listening on 4005');
+});

blog/event-bus/package.json

@@ -0,0 +1,16 @@
+{
+  "name": "event-bus",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "start": "nodemon index.js"
+  },
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "axios": "^0.21.1",
+    "express": "^4.17.1",
+    "nodemon": "^2.0.9"
+  }
+}

blog/moderation/.gitignore

@@ -0,0 +1 @@
+node_modules/

blog/moderation/index.js

@@ -0,0 +1,32 @@
+const expres = require('express');
+const bodyParser = require('body-parser');
+const axios = require('axios');
+
+
+const app = expres();
+app.use(bodyParser.json());
+
+app.post('/events', async (req, res) => {
+  const { type, data } = req.body;
+
+  if(type === 'CommentCreated') {
+    const status = data.content.includes('orange') ? 'rejected' : 'approved';
+    await axios.post('http://localhost:4005/events', {
+      type: 'CommentModerated',
+      data: {
+        id: data.id,
+        postId: data.postId,
+        status,
+        content: data.content
+      }
+    }).catch(error => console.log(error));
+  } 
+
+  res.send({});
+});
+
+
+app.listen(4003, () => {
+  console.log('Listening on 4003');
+});
+

blog/moderation/package.json

@@ -0,0 +1,17 @@
+{
+  "name": "blog",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "start": "nodemon index.js"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "axios": "^0.21.1",
+    "express": "^4.17.1",
+    "nodemon": "^2.0.9"
+  }
+}

blog/posts/.gitignore

@@ -0,0 +1 @@
+node_modules/

blog/posts/index.js

@@ -0,0 +1,37 @@
+const express = require('express');
+const bodyParser = require('body-parser');
+const cors = require('cors');
+const { randomBytes } = require('crypto');
+const axios = require('axios');
+
+const app = express();
+app.use(bodyParser.json());
+app.use(cors());
+
+const posts = {};
+
+app.get('/posts', (req, res) => {
+  res.send(posts);
+});
+
+app.post('/posts', async (req, res) => {
+  const id = randomBytes(4).toString('hex');
+  const { title } = req.body;
+  posts[id] = { id, title };
+
+  await axios.post('http://localhost:4005/events', {
+    type: 'PostCreated',
+    data: posts[id]
+  }).catch(error => console.log(error));
+
+  res.status(201).send(posts[id]);
+});
+
+app.post('/events', (req, res) => {
+  console.log('Received Event', req.body.type);
+  res.send({});
+});
+
+app.listen(4000, () => {
+  console.log('Listening on 4000');
+});

blog/posts/package.json

@@ -0,0 +1,18 @@
+{
+  "name": "posts",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "start": "nodemon index.js"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "axios": "^0.21.1",
+    "cors": "^2.8.5",
+    "express": "^4.17.1",
+    "nodemon": "^2.0.7"
+  }
+}

blog/query/.gitignore

@@ -0,0 +1 @@
+node_modules/

blog/query/index.js

@@ -0,0 +1,57 @@
+const express = require('express');
+const axios = require('axios');
+const bodyParser = require('body-parser');
+const cors = require('cors');
+
+const app = express();
+app.use(bodyParser.json());
+app.use(cors());
+
+const posts = {};
+
+const handleEvent = (type, data) => {
+  console.log(`Handling Event ${type}`, data);
+
+  if (type === 'PostCreated') {
+    const { id, title } = data;
+    posts[id] = { id, title, comments: [] };
+  }
+
+  if(type === 'CommentCreated') {
+    const { id, content, postId, status } = data;
+    const post = posts[postId];
+    post.comments.push({ id, content, status });
+  }
+
+  if(type === 'CommentUpdated') {
+    const { id, content, postId, status } = data;
+    const post = posts[postId];
+    const comment = post.comments.find(comment => comment.id === id);
+
+    comment.status = status;
+    comment.content = content;
+  }
+}
+
+app.get('/posts', (req, res) => {
+  res.send(posts);
+});
+
+app.post('/events', (req, res) => {
+  const { type, data } = req.body;
+  handleEvent(type, data);
+  res.send({});
+});
+
+app.listen(4002, async () => {
+  console.log('Listening on 4002');
+
+  try {
+    const res = await axios.get('http://localhost:4005/events');
+    for (let event of res.data) {
+      handleEvent(event.type, event.data);
+    }
+  }catch(error){ 
+    console.error(error);
+  }
+});

blog/query/package.json

@@ -0,0 +1,18 @@
+{
+  "name": "query",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "start": "nodemon 4002"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "axios": "^0.21.1",
+    "cors": "^2.8.5",
+    "express": "^4.17.1",
+    "nodemon": "^2.0.7"
+  }
+}