├── .gitignore ├── LICENSE ├── README.md ├── form-events ├── .gitignore ├── README.md ├── UNUSED_webpack.config.js ├── bsconfig.json ├── index.html ├── indexProduction.html ├── package-lock.json ├── package.json ├── src │ ├── ExampleStyles.bs.js │ ├── ExampleStyles.re │ ├── Form │ │ ├── Form.bs.js │ │ └── Form.re │ ├── Index.bs.js │ └── Index.re └── watcher.js ├── http-video-stream ├── README.md ├── bigbuck.mp4 ├── index.html ├── index.js ├── package-lock.json └── package.json ├── live-stream-part-1 ├── README.md ├── auth │ ├── Dockerfile │ ├── package-lock.json │ ├── package.json │ └── server.js ├── docker-compose.yml └── rtmp │ ├── Dockerfile │ └── nginx.conf ├── live-stream-part-2 ├── README.md ├── auth │ ├── Dockerfile │ ├── package-lock.json │ ├── package.json │ └── server.js ├── docker-compose.yml └── rtmp │ ├── Dockerfile │ ├── index.html │ └── nginx.conf ├── live-stream-part-3 ├── README.md ├── auth │ ├── Dockerfile │ ├── package-lock.json │ ├── package.json │ └── server.js ├── docker-compose.yml └── rtmp │ ├── Dockerfile │ ├── index.html │ └── nginx.conf ├── mongo-http-video ├── README.md ├── docker-compose.yml ├── index.html ├── index.js ├── package-lock.json ├── package.json └── typings │ └── jsconfig.json ├── multi-quality-video-player ├── .eslintrc.json ├── .gitignore ├── README.md ├── components │ ├── InfiniteLoading.svg │ └── VideoPlayer.tsx ├── init-db.js ├── lib │ ├── db.ts │ └── ffmpeg.ts ├── next.config.js ├── package-lock.json ├── package.json ├── pages │ ├── _app.tsx │ ├── api │ │ ├── upload.ts │ │ └── videos.ts │ ├── index.tsx │ └── upload.tsx ├── styles │ ├── Home.module.css │ ├── Upload.module.css │ ├── VideoPlayer.module.css │ └── globals.css └── tsconfig.json └── sql-offset ├── Twitter_ERD.png ├── date_pagination.py ├── id_pagination.py ├── offset_pagination.py ├── requirements.txt ├── schema.sql ├── seed.py └── timeline.py /.gitignore: -------------------------------------------------------------------------------- 1 | node_modules 2 | *.mp4 3 | # See https://help.github.com/articles/ignoring-files/ for more about ignoring files. 4 | 5 | # dependencies 6 | /node_modules 7 | /.pnp 8 | .pnp.js 9 | 10 | # testing 11 | /coverage 12 | 13 | # next.js 14 | /.next/ 15 | /out/ 16 | 17 | # production 18 | /build 19 | 20 | # misc 21 | .DS_Store 22 | *.pem 23 | 24 | # debug 25 | npm-debug.log* 26 | yarn-debug.log* 27 | yarn-error.log* 28 | .pnpm-debug.log* 29 | 30 | # local env files 31 | .env*.local 32 | 33 | # vercel 34 | .vercel 35 | 36 | # typescript 37 | *.tsbuildinfo 38 | next-env.d.ts 39 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | MIT License 2 | 3 | Copyright (c) 2021 Abdisalan Mohamud 4 | 5 | Permission is hereby granted, free of charge, to any person obtaining a copy 6 | of this software and associated documentation files (the "Software"), to deal 7 | in the Software without restriction, including without limitation the rights 8 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 9 | copies of the Software, and to permit persons to whom the Software is 10 | furnished to do so, subject to the following conditions: 11 | 12 | The above copyright notice and this permission notice shall be included in all 13 | copies or substantial portions of the Software. 14 | 15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 18 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 20 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 21 | SOFTWARE. 22 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # Code Examples For YouTube and abdisalan.com 2 | 3 | --- 4 | 5 | - [ReasonML Form Events](/form-events) 6 | - [Why I dont't Use OFFSET](/sql-offset) 7 | - [Simple HTTP Video Streaming](/http-video-stream) 8 | - [MongoDB HTTP Video Streaming](/mongo-http-video) 9 | - [LIVE Video Streaming Part 1](/live-stream-part-1) 10 | - [LIVE Video Streaming Part 2](/live-stream-part-2) 11 | - [LIVE Video Streaming Part 3](/live-stream-part-3) 12 | -------------------------------------------------------------------------------- /form-events/.gitignore: -------------------------------------------------------------------------------- 1 | .DS_Store 2 | .merlin 3 | .bsb.lock 4 | npm-debug.log 5 | /lib/bs/ 6 | /node_modules/ 7 | /bundleOutput/ -------------------------------------------------------------------------------- /form-events/README.md: -------------------------------------------------------------------------------- 1 | # ReasonReact Form Example 2 | 3 | ## How to run 4 | ### Install and compile reasonml code to javascript 5 | ```bash 6 | $ npm install 7 | $ npm start 8 | ``` 9 | 10 | ### Open another terminal window and serve the app on localhost:8000 11 | ```bash 12 | $ npm run server 13 | ``` 14 | 15 | ## Based off bs-platform template 16 | This project was bootstrapped using bucklescript by running these commands 17 | ```bash 18 | $ npm install --global bs-platform@7.0.1 19 | $ bsb -init form-events -theme react-hooks 20 | ``` 21 | -------------------------------------------------------------------------------- /form-events/UNUSED_webpack.config.js: -------------------------------------------------------------------------------- 1 | const path = require('path'); 2 | 3 | module.exports = { 4 | entry: './src/Index.bs.js', 5 | // If you ever want to use webpack during development, change 'production' 6 | // to 'development' as per webpack documentation. Again, you don't have to 7 | // use webpack or any other bundler during development! Recheck README if 8 | // you didn't know this 9 | mode: 'production', 10 | output: { 11 | path: path.join(__dirname, "bundleOutput"), 12 | filename: 'index.js', 13 | }, 14 | }; -------------------------------------------------------------------------------- /form-events/bsconfig.json: -------------------------------------------------------------------------------- 1 | { 2 | "name": "reason-react-examples", 3 | "reason": { 4 | "react-jsx": 3 5 | }, 6 | "sources": { 7 | "dir" : "src", 8 | "subdirs" : true 9 | }, 10 | "bsc-flags": ["-bs-super-errors", "-bs-no-version-header"], 11 | "package-specs": [{ 12 | "module": "commonjs", 13 | "in-source": true 14 | }], 15 | "suffix": ".bs.js", 16 | "namespace": true, 17 | "bs-dependencies": [ 18 | "reason-react" 19 | ], 20 | "refmt": 3 21 | } 22 | -------------------------------------------------------------------------------- /form-events/index.html: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | ReasonReact Examples 6 | 7 | 8 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | -------------------------------------------------------------------------------- /form-events/indexProduction.html: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | ReasonReact Examples 6 | 7 | 8 | 9 | 10 | 11 | -------------------------------------------------------------------------------- /form-events/package-lock.json: -------------------------------------------------------------------------------- 1 | { 2 | "name": "form-events", 3 | "version": "0.1.0", 4 | "lockfileVersion": 1, 5 | "requires": true, 6 | "dependencies": { 7 | "bs-platform": { 8 | "version": "7.0.1", 9 | "resolved": "https://registry.npmjs.org/bs-platform/-/bs-platform-7.0.1.tgz", 10 | "integrity": "sha512-UjStdtHhbtC/l6vKJ1XRDqrPk7rFf5PLYHtRX3akDXEYVnTbN36z0g4DEr5mU8S0N945e33HYts9x+i7hKKpZQ==", 11 | "dev": true 12 | }, 13 | "debug": { 14 | "version": "2.6.9", 15 | "resolved": 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"integrity": "sha512-yaOH/Pk/VEhBWWTlhI+qXxDFXlejDGcQipMlyxda9nthulaxLZUNcUqFxokp0vcYnvteJln5FNQDRrxj3YcbVw==", 255 | "dev": true 256 | } 257 | } 258 | } 259 | -------------------------------------------------------------------------------- /form-events/package.json: -------------------------------------------------------------------------------- 1 | { 2 | "name": "form-events", 3 | "version": "0.1.0", 4 | "scripts": { 5 | "build": "bsb -make-world", 6 | "start": "bsb -make-world -w -ws _ ", 7 | "clean": "bsb -clean-world", 8 | "server": "moduleserve ./ --port 8000", 9 | "test": "echo \"Error: no test specified\" && exit 1" 10 | }, 11 | "keywords": [ 12 | "BuckleScript", 13 | "ReasonReact", 14 | "reason-react" 15 | ], 16 | "author": "", 17 | "license": "MIT", 18 | "dependencies": { 19 | "react": "^16.8.1", 20 | "react-dom": "^16.8.1", 21 | "reason-react": ">=0.7.0" 22 | }, 23 | "devDependencies": { 24 | "bs-platform": "^7.0.1", 25 | "moduleserve": "^0.9.0" 26 | } 27 | } 28 | -------------------------------------------------------------------------------- /form-events/src/ExampleStyles.bs.js: -------------------------------------------------------------------------------- 1 | 'use strict'; 2 | 3 | 4 | var reasonReactBlue = "#48a9dc"; 5 | 6 | var style = "\n body {\n background-color: rgb(224, 226, 229);\n display: flex;\n flex-direction: column;\n align-items: center;\n }\n button {\n background-color: white;\n color: " + (String(reasonReactBlue) + (";\n box-shadow: 0 0 0 1px " + (String(reasonReactBlue) + (";\n border: none;\n padding: 8px;\n font-size: 16px;\n display: block;\n border-radius: 5px;\n }\n button:active {\n background-color: " + (String(reasonReactBlue) + ";\n color: white;\n }\n .container {\n margin: 12px 0px;\n box-shadow: 0px 4px 16px rgb(200, 200, 200);\n border-radius: 12px;\n font-family: sans-serif;\n }\n .containerTitle {\n background-color: rgb(242, 243, 245);\n border-radius: 12px 12px 0px 0px;\n padding: 12px;\n font-weight: bold;\n }\n .containerContent {\n background-color: white;\n padding: 16px;\n border-radius: 0px 0px 12px 12px;\n }\n label {\n display: block;\n color: #555;\n font-size: 0.875em;\n }\n input {\n border-radius: 5px;\n border: 1px solid #ddd; padding: 7px; display: block;\n width: 300px;\n margin-bottom: 15px;\n margin-top: 5px;\n }\n select {\n margin-bottom: 15px;\n margin-top: 5px;\n }\n"))))); 7 | 8 | exports.reasonReactBlue = reasonReactBlue; 9 | exports.style = style; 10 | /* style Not a pure module */ 11 | -------------------------------------------------------------------------------- /form-events/src/ExampleStyles.re: -------------------------------------------------------------------------------- 1 | let reasonReactBlue = "#48a9dc"; 2 | 3 | // The {j|...|j} feature is just string interpolation, from 4 | // bucklescript.github.io/docs/en/interop-cheatsheet#string-unicode-interpolation 5 | // This allows us to conveniently write CSS, together with variables, by 6 | // constructing a string 7 | let style = {j| 8 | body { 9 | background-color: rgb(224, 226, 229); 10 | display: flex; 11 | flex-direction: column; 12 | align-items: center; 13 | } 14 | button { 15 | background-color: white; 16 | color: $reasonReactBlue; 17 | box-shadow: 0 0 0 1px $reasonReactBlue; 18 | border: none; 19 | padding: 8px; 20 | font-size: 16px; 21 | display: block; 22 | border-radius: 5px; 23 | } 24 | button:active { 25 | background-color: $reasonReactBlue; 26 | color: white; 27 | } 28 | .container { 29 | margin: 12px 0px; 30 | box-shadow: 0px 4px 16px rgb(200, 200, 200); 31 | border-radius: 12px; 32 | font-family: sans-serif; 33 | } 34 | .containerTitle { 35 | background-color: rgb(242, 243, 245); 36 | border-radius: 12px 12px 0px 0px; 37 | padding: 12px; 38 | font-weight: bold; 39 | } 40 | .containerContent { 41 | background-color: white; 42 | padding: 16px; 43 | border-radius: 0px 0px 12px 12px; 44 | } 45 | label { 46 | display: block; 47 | color: #555; 48 | font-size: 0.875em; 49 | } 50 | input { 51 | border-radius: 5px; 52 | border: 1px solid #ddd; padding: 7px; display: block; 53 | width: 300px; 54 | margin-bottom: 15px; 55 | margin-top: 5px; 56 | } 57 | select { 58 | margin-bottom: 15px; 59 | margin-top: 5px; 60 | } 61 | |j}; -------------------------------------------------------------------------------- /form-events/src/Form/Form.bs.js: -------------------------------------------------------------------------------- 1 | 'use strict'; 2 | 3 | var Curry = require("bs-platform/lib/js/curry.js"); 4 | var React = require("react"); 5 | 6 | function Form(Props) { 7 | var match = React.useState((function () { 8 | return ""; 9 | })); 10 | var setName = match[1]; 11 | var name = match[0]; 12 | var onSubmit = function (e) { 13 | e.preventDefault(); 14 | console.log("Hi my name is " + (String(name) + "")); 15 | return /* () */0; 16 | }; 17 | var onChange = function (e) { 18 | return Curry._1(setName, e.target.value); 19 | }; 20 | return React.createElement("form", { 21 | onSubmit: onSubmit 22 | }, React.createElement("label", undefined, "Name"), React.createElement("input", { 23 | name: "name", 24 | type: "text", 25 | value: name, 26 | onChange: onChange 27 | }), React.createElement("button", { 28 | type: "submit" 29 | }, "submit")); 30 | } 31 | 32 | var make = Form; 33 | 34 | exports.make = make; 35 | /* react Not a pure module */ 36 | -------------------------------------------------------------------------------- /form-events/src/Form/Form.re: -------------------------------------------------------------------------------- 1 | [@react.component] 2 | let make = () => { 3 | let (name, setName) = React.useState(() => ""); 4 | 5 | let onSubmit = (e: ReactEvent.Form.t): unit => { 6 | ReactEvent.Form.preventDefault(e); 7 | Js.log({j|Hi my name is $name|j}); 8 | }; 9 | 10 | let onChange = (e: ReactEvent.Form.t): unit => { 11 | let value = e->ReactEvent.Form.target##value; 12 | setName(value); 13 | }; 14 | 15 |
16 | 17 | 18 | 19 |
; 20 | }; -------------------------------------------------------------------------------- /form-events/src/Index.bs.js: -------------------------------------------------------------------------------- 1 | 'use strict'; 2 | 3 | var React = require("react"); 4 | var ReactDom = require("react-dom"); 5 | var Form$ReasonReactExamples = require("./Form/Form.bs.js"); 6 | var ExampleStyles$ReasonReactExamples = require("./ExampleStyles.bs.js"); 7 | 8 | var style = document.createElement("style"); 9 | 10 | document.head.appendChild(style); 11 | 12 | style.innerHTML = ExampleStyles$ReasonReactExamples.style; 13 | 14 | function makeContainer(text) { 15 | var container = document.createElement("div"); 16 | container.className = "container"; 17 | var title = document.createElement("div"); 18 | title.className = "containerTitle"; 19 | title.innerText = text; 20 | var content = document.createElement("div"); 21 | content.className = "containerContent"; 22 | container.appendChild(title); 23 | container.appendChild(content); 24 | document.body.appendChild(container); 25 | return content; 26 | } 27 | 28 | ReactDom.render(React.createElement(Form$ReasonReactExamples.make, { }), makeContainer("Form Example")); 29 | 30 | exports.style = style; 31 | exports.makeContainer = makeContainer; 32 | /* style Not a pure module */ 33 | -------------------------------------------------------------------------------- /form-events/src/Index.re: -------------------------------------------------------------------------------- 1 | // Entry point 2 | 3 | [@bs.val] external document: Js.t({..}) = "document"; 4 | 5 | // We're using raw DOM manipulations here, to avoid making you read 6 | // ReasonReact when you might precisely be trying to learn it for the first 7 | // time through the examples later. 8 | let style = document##createElement("style"); 9 | document##head##appendChild(style); 10 | style##innerHTML #= ExampleStyles.style; 11 | 12 | let makeContainer = text => { 13 | let container = document##createElement("div"); 14 | container##className #= "container"; 15 | 16 | let title = document##createElement("div"); 17 | title##className #= "containerTitle"; 18 | title##innerText #= text; 19 | 20 | let content = document##createElement("div"); 21 | content##className #= "containerContent"; 22 | 23 | let () = container##appendChild(title); 24 | let () = container##appendChild(content); 25 | let () = document##body##appendChild(container); 26 | 27 | content; 28 | }; 29 | 30 | // All 4 examples. 31 | ReactDOMRe.render(
, makeContainer("Form Example")); -------------------------------------------------------------------------------- /form-events/watcher.js: -------------------------------------------------------------------------------- 1 | // This is our simple, robust watcher. It hooks into the BuckleScript build 2 | // system to listen for build events. 3 | // See package.json's `start` script and `./node_modules/.bin/bsb --help` 4 | 5 | // Btw, if you change this file and reload the page, your browser cache 6 | // _might_ not pick up the new version. If you're in Chrome, do Force Reload. 7 | 8 | var websocketReloader; 9 | var LAST_SUCCESS_BUILD_STAMP = localStorage.getItem('LAST_SUCCESS_BUILD_STAMP') || 0; 10 | // package.json's `start` script's `bsb -ws _` means it'll pipe build events 11 | // through a websocket connection to a default port of 9999. This is 12 | // configurable, e.g. `-ws 5000` 13 | var webSocketPort = 9999; 14 | 15 | function setUpWebSocket() { 16 | if (websocketReloader == null || websocketReloader.readyState !== 1) { 17 | try { 18 | websocketReloader = new WebSocket(`ws://localhost:${webSocketPort}`); 19 | websocketReloader.onmessage = (message) => { 20 | var newData = JSON.parse(message.data).LAST_SUCCESS_BUILD_STAMP; 21 | if (newData > LAST_SUCCESS_BUILD_STAMP) { 22 | LAST_SUCCESS_BUILD_STAMP = newData; 23 | localStorage.setItem('LAST_SUCCESS_BUILD_STAMP', LAST_SUCCESS_BUILD_STAMP); 24 | // Refresh the page! This will naturally re-run everything, 25 | // including our moduleserve which will re-resolve all the modules. 26 | // No stable build! 27 | location.reload(true); 28 | } 29 | 30 | } 31 | } catch (exn) { 32 | console.error("The watcher tried to connect to web socket, but failed. Here's the message:"); 33 | console.error(exn); 34 | } 35 | } 36 | }; 37 | 38 | setUpWebSocket(); 39 | setInterval(setUpWebSocket, 2000); 40 | -------------------------------------------------------------------------------- /http-video-stream/README.md: -------------------------------------------------------------------------------- 1 | # How to run 2 | ``` 3 | npm install 4 | npm start 5 | ``` 6 | 7 | ### Bonus Challenge 8 | You can decide how much data to actually give back to the browser 9 | instead of streaming the whole video like Chrome asks. 10 | 11 | Can you figure out how to make the chunk size 10kb per request? -------------------------------------------------------------------------------- /http-video-stream/bigbuck.mp4: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Abdisalan/blog-code-examples/36f28712e2503c65120eb32adaf323795db34bfe/http-video-stream/bigbuck.mp4 -------------------------------------------------------------------------------- /http-video-stream/index.html: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | Document 7 | 21 | 22 | 23 | 24 |

HTTP Video Streaming

25 |

This video is 61MB and is being streamed instead of downloaded.

26 |

27 | Feel free to seek through the video and it only loads the part you want to 28 | watch 29 |

30 | 33 | Big Buck Bunny 34 | 35 | 36 | -------------------------------------------------------------------------------- /http-video-stream/index.js: -------------------------------------------------------------------------------- 1 | const express = require("express"); 2 | const app = express(); 3 | const fs = require("fs"); 4 | 5 | app.get("/", function (req, res) { 6 | res.sendFile(__dirname + "/index.html"); 7 | }); 8 | 9 | app.get("/video", function (req, res) { 10 | // Ensure there is a range given for the video 11 | const range = req.headers.range; 12 | if (!range) { 13 | return res.status(400).send("Requires Range header"); 14 | } 15 | 16 | // get video stats (about 61MB) 17 | const videoPath = "bigbuck.mp4"; 18 | const videoSize = fs.statSync("bigbuck.mp4").size; 19 | 20 | // Parse Range 21 | // Example: "bytes=32324-" 22 | const CHUNK_SIZE = 10 ** 6; // 1MB 23 | const start = Number(range.replace(/\D/g, "")); 24 | const end = Math.min(start + CHUNK_SIZE, videoSize - 1); 25 | 26 | // Create headers 27 | const contentLength = end - start + 1; 28 | const headers = { 29 | "Content-Range": `bytes ${start}-${end}/${videoSize}`, 30 | "Accept-Ranges": "bytes", 31 | "Content-Length": contentLength, 32 | "Content-Type": "video/mp4", 33 | }; 34 | 35 | // HTTP Status 206 for Partial Content 36 | res.writeHead(206, headers); 37 | 38 | // create video read stream for this particular chunk 39 | const videoStream = fs.createReadStream(videoPath, { start, end }); 40 | 41 | // Stream the video chunk to the client 42 | videoStream.pipe(res); 43 | }); 44 | 45 | app.listen(8000, function () { 46 | console.log("Listening on port 8000!"); 47 | }); 48 | -------------------------------------------------------------------------------- /http-video-stream/package-lock.json: -------------------------------------------------------------------------------- 1 | { 2 | "name": "http-video-stream", 3 | "version": "1.0.0", 4 | "lockfileVersion": 1, 5 | "requires": true, 6 | "dependencies": { 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"integrity": "sha512-WxONCrssBM8TSPRqN5EmsjVrsv4A8X12J4ArBiiayv3DyyG3ZlIg6yysuuSYdZsVz3TKcTg2fd//Ujd4CHV1iA==" 596 | }, 597 | "unpipe": { 598 | "version": "1.0.0", 599 | "resolved": "https://registry.npmjs.org/unpipe/-/unpipe-1.0.0.tgz", 600 | "integrity": "sha1-sr9O6FFKrmFltIF4KdIbLvSZBOw=" 601 | }, 602 | "utils-merge": { 603 | "version": "1.0.1", 604 | "resolved": "https://registry.npmjs.org/utils-merge/-/utils-merge-1.0.1.tgz", 605 | "integrity": "sha1-n5VxD1CiZ5R7LMwSR0HBAoQn5xM=" 606 | }, 607 | "vary": { 608 | "version": "1.1.2", 609 | "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz", 610 | "integrity": "sha1-IpnwLG3tMNSllhsLn3RSShj2NPw=" 611 | } 612 | } 613 | } 614 | -------------------------------------------------------------------------------- /http-video-stream/package.json: -------------------------------------------------------------------------------- 1 | { 2 | "name": "http-video-stream", 3 | "version": "1.0.0", 4 | "description": "", 5 | "main": "index.js", 6 | "scripts": { 7 | "start": "nodemon index.js" 8 | }, 9 | "author": "", 10 | "license": "ISC", 11 | "dependencies": { 12 | "express": "^4.17.1", 13 | "nodemon": "^2.0.20" 14 | } 15 | } 16 | -------------------------------------------------------------------------------- /live-stream-part-1/README.md: -------------------------------------------------------------------------------- 1 | ## How to run 2 | 3 | 1. Install Docker 4 | 2. `docker-compose build` 5 | 3. `docker-compose up` 6 | 4. Open OBS and in settings set the server to `rtmp://localhost:1935/live` and the stream key to `abdi?key=supersecret` 7 | 5. Open VLC and Open a Network Stream and set the url to `rtmp://localhost:1935/live/abdi` 8 | 6. You should see your live stream now! 9 | -------------------------------------------------------------------------------- /live-stream-part-1/auth/Dockerfile: -------------------------------------------------------------------------------- 1 | FROM node:12 2 | WORKDIR /usr/src/app 3 | COPY package*.json ./ 4 | RUN npm install 5 | COPY server.js ./ 6 | CMD ["npm", "start"] -------------------------------------------------------------------------------- /live-stream-part-1/auth/package-lock.json: -------------------------------------------------------------------------------- 1 | { 2 | "name": "auth", 3 | "version": "1.0.0", 4 | "lockfileVersion": 1, 5 | "requires": true, 6 | "dependencies": { 7 | "@sindresorhus/is": { 8 | "version": "0.14.0", 9 | "resolved": "https://registry.npmjs.org/@sindresorhus/is/-/is-0.14.0.tgz", 10 | "integrity": "sha512-9NET910DNaIPngYnLLPeg+Ogzqsi9uM4mSboU5y6p8S5DzMTVEsJZrawi+BoDNUVBa2DhJqQYUFvMDfgU062LQ==" 11 | }, 12 | "@szmarczak/http-timer": { 13 | 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1217 | "imurmurhash": "^0.1.4", 1218 | "is-typedarray": "^1.0.0", 1219 | "signal-exit": "^3.0.2", 1220 | "typedarray-to-buffer": "^3.1.5" 1221 | } 1222 | }, 1223 | "xdg-basedir": { 1224 | "version": "4.0.0", 1225 | "resolved": "https://registry.npmjs.org/xdg-basedir/-/xdg-basedir-4.0.0.tgz", 1226 | "integrity": "sha512-PSNhEJDejZYV7h50BohL09Er9VaIefr2LMAf3OEmpCkjOi34eYyQYAXUTjEQtZJTKcF0E2UKTh+osDLsgNim9Q==" 1227 | } 1228 | } 1229 | } 1230 | -------------------------------------------------------------------------------- /live-stream-part-1/auth/package.json: -------------------------------------------------------------------------------- 1 | { 2 | "name": "auth", 3 | "version": "1.0.0", 4 | "description": "", 5 | "main": "index.js", 6 | "scripts": { 7 | "start": "nodemon server.js", 8 | "test": "echo \"Error: no test specified\" && exit 1" 9 | }, 10 | "author": "", 11 | "license": "ISC", 12 | "dependencies": { 13 | "express": "^4.17.1", 14 | "nodemon": "^2.0.7" 15 | } 16 | } 17 | -------------------------------------------------------------------------------- /live-stream-part-1/auth/server.js: -------------------------------------------------------------------------------- 1 | const express = require('express'); 2 | const app = express(); 3 | 4 | app.use(express.urlencoded()); 5 | 6 | app.post("/auth", function (req, res) { 7 | /* This server is only available to nginx */ 8 | const streamkey = req.body.key; 9 | 10 | /* You can make a database of users instead :) */ 11 | if (streamkey === "supersecret") { 12 | res.status(200).send(); 13 | return; 14 | } 15 | 16 | /* Reject the stream */ 17 | res.status(403).send(); 18 | }); 19 | 20 | app.listen(8000, function () { 21 | console.log("Listening on port 8000!"); 22 | }); -------------------------------------------------------------------------------- /live-stream-part-1/docker-compose.yml: -------------------------------------------------------------------------------- 1 | version: "3.9" 2 | services: 3 | rtmp: 4 | build: ./rtmp 5 | ports: 6 | - "1935:1935" 7 | container_name: rtmp_server 8 | 9 | auth: 10 | build: ./auth 11 | container_name: auth_server -------------------------------------------------------------------------------- /live-stream-part-1/rtmp/Dockerfile: -------------------------------------------------------------------------------- 1 | FROM tiangolo/nginx-rtmp 2 | 3 | COPY nginx.conf /etc/nginx/nginx.conf -------------------------------------------------------------------------------- /live-stream-part-1/rtmp/nginx.conf: -------------------------------------------------------------------------------- 1 | worker_processes auto; 2 | rtmp_auto_push on; 3 | events {} 4 | rtmp { 5 | server { 6 | listen 1935; 7 | listen [::]:1935 ipv6only=on; 8 | 9 | application live { 10 | live on; 11 | record off; 12 | 13 | on_publish http://auth_server:8000/auth; 14 | } 15 | } 16 | } -------------------------------------------------------------------------------- /live-stream-part-2/README.md: -------------------------------------------------------------------------------- 1 | ## How to run 2 | 3 | 1. Install Docker 4 | 2. `docker-compose build` 5 | 3. `docker-compose up` 6 | 4. Open OBS and in settings set the server to `rtmp://localhost:1935/live` and the stream key to `test?key=supersecret` 7 | 8 | **IF YOU STREAM KEY IS DIFFERENT THAN "TEST" YOU WILL HAVE TO CHANGE THE INDEX.HTML FILE SO THAT IT LOOKS FOR {other-stream-key}.m3u8} (line 17)** 9 | 6. Open a browser and go to `http://localhost:8080` to view your live stream! 10 | -------------------------------------------------------------------------------- /live-stream-part-2/auth/Dockerfile: -------------------------------------------------------------------------------- 1 | FROM node:12 2 | WORKDIR /usr/src/app 3 | COPY package*.json ./ 4 | RUN npm install 5 | COPY server.js ./ 6 | CMD ["npm", "start"] -------------------------------------------------------------------------------- /live-stream-part-2/auth/package.json: -------------------------------------------------------------------------------- 1 | { 2 | "name": "auth", 3 | "version": "1.0.0", 4 | "description": "", 5 | "main": "index.js", 6 | "scripts": { 7 | "start": "nodemon server.js", 8 | "test": "echo \"Error: no test specified\" && exit 1" 9 | }, 10 | "author": "", 11 | "license": "ISC", 12 | "dependencies": { 13 | "express": "^4.17.1", 14 | "nodemon": "^2.0.7" 15 | } 16 | } 17 | -------------------------------------------------------------------------------- /live-stream-part-2/auth/server.js: -------------------------------------------------------------------------------- 1 | const express = require('express'); 2 | const app = express(); 3 | 4 | app.use(express.urlencoded()); 5 | 6 | app.post("/auth", function (req, res) { 7 | /* This server is only available to nginx */ 8 | const streamkey = req.body.key; 9 | 10 | /* You can make a database of users instead :) */ 11 | if (streamkey === "supersecret") { 12 | res.status(200).send(); 13 | return; 14 | } 15 | 16 | /* Reject the stream */ 17 | res.status(403).send(); 18 | }); 19 | 20 | app.listen(8000, function () { 21 | console.log("Listening on port 8000!"); 22 | }); -------------------------------------------------------------------------------- /live-stream-part-2/docker-compose.yml: -------------------------------------------------------------------------------- 1 | version: "3.9" 2 | services: 3 | rtmp: 4 | build: ./rtmp 5 | ports: 6 | - "1935:1935" 7 | - "8080:8080" 8 | container_name: rtmp_server 9 | volumes: 10 | - ./data:/tmp/hls 11 | 12 | auth: 13 | build: ./auth 14 | container_name: auth_server -------------------------------------------------------------------------------- /live-stream-part-2/rtmp/Dockerfile: -------------------------------------------------------------------------------- 1 | FROM tiangolo/nginx-rtmp 2 | 3 | COPY nginx.conf /etc/nginx/nginx.conf 4 | COPY index.html /www/ -------------------------------------------------------------------------------- /live-stream-part-2/rtmp/index.html: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | Live Stream 8 | 9 | 10 |

Live Stream

11 | 12 | 13 | 14 | 15 | 40 | 41 | 42 | -------------------------------------------------------------------------------- /live-stream-part-2/rtmp/nginx.conf: -------------------------------------------------------------------------------- 1 | events {} 2 | rtmp { 3 | server { 4 | listen 1935; # Listen on standard RTMP port 5 | 6 | application live { 7 | live on; 8 | hls on; 9 | hls_path /tmp/hls; 10 | hls_fragment 10s; # default is 5s 11 | hls_playlist_length 5m; # default is 30s 12 | # once playlist length is reached it deletes the oldest fragments 13 | 14 | # authentication 15 | on_publish http://auth_server:8000/auth; 16 | } 17 | } 18 | } 19 | 20 | http { 21 | server { 22 | listen 8080; 23 | 24 | location / { 25 | root /www; 26 | } 27 | 28 | location /hls { 29 | types { 30 | application/vnd.apple.mpegurl m3u8; 31 | application/octet-stream ts; 32 | } 33 | root /tmp; 34 | add_header Cache-Control no-cache; 35 | 36 | # To avoid issues with cross-domain HTTP requests (e.g. during development) 37 | add_header Access-Control-Allow-Origin *; 38 | } 39 | } 40 | } -------------------------------------------------------------------------------- /live-stream-part-3/README.md: -------------------------------------------------------------------------------- 1 | ## How to run 2 | 3 | 1. Install Docker 4 | 2. `docker-compose build` 5 | 3. `docker-compose up` 6 | 4. Open OBS and in settings set the server to `rtmp://localhost:1935/live` and the stream key to `test?key=supersecret` 7 | 5. Open a browser and go to `http://localhost:3000` to view your live stream! 8 | -------------------------------------------------------------------------------- /live-stream-part-3/auth/Dockerfile: -------------------------------------------------------------------------------- 1 | FROM node:12 2 | WORKDIR /usr/src/app 3 | COPY package*.json ./ 4 | RUN npm install 5 | COPY server.js ./ 6 | CMD ["npm", "start"] -------------------------------------------------------------------------------- /live-stream-part-3/auth/package.json: -------------------------------------------------------------------------------- 1 | { 2 | "name": "auth", 3 | "version": "1.0.0", 4 | "description": "", 5 | "main": "index.js", 6 | "scripts": { 7 | "start": "nodemon server.js", 8 | "test": "echo \"Error: no test specified\" && exit 1" 9 | }, 10 | "author": "", 11 | "license": "ISC", 12 | "dependencies": { 13 | "express": "^4.17.1", 14 | "nodemon": "^2.0.7" 15 | } 16 | } 17 | -------------------------------------------------------------------------------- /live-stream-part-3/auth/server.js: -------------------------------------------------------------------------------- 1 | const express = require('express'); 2 | const app = express(); 3 | 4 | app.use(express.urlencoded()); 5 | 6 | app.post("/auth", function (req, res) { 7 | /* This server is only available to nginx */ 8 | const streamkey = req.body.key; 9 | 10 | /* You can make a database of users instead :) */ 11 | if (streamkey === "supersecret") { 12 | res.status(200).send(); 13 | return; 14 | } 15 | 16 | /* Reject the stream */ 17 | res.status(403).send(); 18 | }); 19 | 20 | app.listen(8000, function () { 21 | console.log("Listening on port 8000!"); 22 | }); -------------------------------------------------------------------------------- /live-stream-part-3/docker-compose.yml: -------------------------------------------------------------------------------- 1 | version: "3.3" 2 | services: 3 | rtmp: 4 | build: ./rtmp 5 | ports: 6 | - "1935:1935" 7 | - "80:8080" 8 | container_name: rtmp_server 9 | volumes: 10 | - ./data:/tmp/hls 11 | 12 | auth: 13 | build: ./auth 14 | container_name: auth_server -------------------------------------------------------------------------------- /live-stream-part-3/rtmp/Dockerfile: -------------------------------------------------------------------------------- 1 | FROM tiangolo/nginx-rtmp 2 | 3 | COPY nginx.conf /etc/nginx/nginx.conf 4 | COPY index.html /www/ -------------------------------------------------------------------------------- /live-stream-part-3/rtmp/index.html: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | Live Stream 8 | 9 | 10 |

Live Stream

11 | 12 | 13 | 14 | 15 | 40 | 41 | 42 | -------------------------------------------------------------------------------- /live-stream-part-3/rtmp/nginx.conf: -------------------------------------------------------------------------------- 1 | events {} 2 | rtmp { 3 | server { 4 | listen 1935; # Listen on standard RTMP port 5 | 6 | application live { 7 | live on; 8 | hls on; 9 | hls_path /tmp/hls; 10 | hls_fragment 10s; # default is 5s 11 | hls_playlist_length 5m; # default is 30s 12 | # once playlist length is reached it deletes the oldest fragments 13 | 14 | # authentication 15 | on_publish http://auth_server:8000/auth; 16 | } 17 | } 18 | } 19 | 20 | http { 21 | server { 22 | listen 8080; 23 | 24 | location / { 25 | root /www; 26 | } 27 | 28 | location /hls { 29 | types { 30 | application/vnd.apple.mpegurl m3u8; 31 | application/octet-stream ts; 32 | } 33 | root /tmp; 34 | add_header Cache-Control no-cache; 35 | 36 | # To avoid issues with cross-domain HTTP requests (e.g. during development) 37 | add_header Access-Control-Allow-Origin *; 38 | } 39 | } 40 | } -------------------------------------------------------------------------------- /mongo-http-video/README.md: -------------------------------------------------------------------------------- 1 | ## Requirements 2 | 3 | My instructions use docker but you can run mongodb yourself locally as well. 4 | 5 | ## How to initialize the db with a video 6 | 7 | ``` 8 | # copy the bigbuck video from our last demo 9 | cp ../http-video-stream/bigbuck.mp4 . 10 | 11 | # After starting the server 12 | curl localhost:8000/init-video 13 | ``` 14 | 15 | ## Start the server 16 | 17 | ``` 18 | # how to start 19 | docker-compose up -d 20 | 21 | # how to turn off 22 | docker-compose down -v 23 | ``` 24 | 25 | ## Bonus Challenge 26 | 27 | This way of initializing the database is pretty bad. 28 | Could you make an upload page? 29 | What about a page that lists all the videos in the db that lets you pick which one to play? 30 | -------------------------------------------------------------------------------- /mongo-http-video/docker-compose.yml: -------------------------------------------------------------------------------- 1 | version: "3.7" 2 | services: 3 | app: 4 | image: node:12-alpine 5 | command: sh -c "npm install && npm start" 6 | ports: 7 | - 8000:8000 8 | working_dir: /app 9 | container_name: app 10 | volumes: 11 | - ./:/app 12 | 13 | db: 14 | image: mongo:latest 15 | ports: 16 | - "27017:27017" 17 | container_name: db 18 | volumes: 19 | - mongo-data:/data/db 20 | environment: 21 | - MONGO_INITDB_ROOT_USERNAME=user 22 | - MONGO_INITDB_ROOT_PASSWORD=password 23 | - MONGO_INITDB_DATABASE=videos 24 | 25 | volumes: 26 | mongo-data: 27 | -------------------------------------------------------------------------------- /mongo-http-video/index.html: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | Document 7 | 21 | 22 | 23 | 24 |

HTTP Video Streaming

25 |

This video is 61MB and is being streamed instead of downloaded.

26 |

27 | Feel free to seek through the video and it only loads the part you want to 28 | watch 29 |

30 | 33 | Big Buck Bunny 34 | 35 | 36 | -------------------------------------------------------------------------------- /mongo-http-video/index.js: -------------------------------------------------------------------------------- 1 | const express = require("express"); 2 | const app = express(); 3 | const fs = require("fs"); 4 | const mongodb = require('mongodb'); 5 | const url = 'mongodb://user:password@db:27017'; 6 | 7 | app.get("/", function (req, res) { 8 | res.sendFile(__dirname + "/index.html"); 9 | }); 10 | 11 | // Sorry about this monstrosity 12 | app.get('/init-video', function (req, res) { 13 | mongodb.MongoClient.connect(url, function (error, client) { 14 | if (error) { 15 | res.json(error); 16 | return; 17 | } 18 | const db = client.db('videos'); 19 | const bucket = new mongodb.GridFSBucket(db); 20 | const videoUploadStream = bucket.openUploadStream('bigbuck'); 21 | const videoReadStream = fs.createReadStream('./bigbuck.mp4'); 22 | videoReadStream.pipe(videoUploadStream); 23 | res.status(200).send("Done..."); 24 | }); 25 | }); 26 | 27 | app.get("/mongo-video", function (req, res) { 28 | mongodb.MongoClient.connect(url, function (error, client) { 29 | if (error) { 30 | res.status(500).json(error); 31 | return; 32 | } 33 | 34 | const range = req.headers.range; 35 | if (!range) { 36 | res.status(400).send("Requires Range header"); 37 | } 38 | 39 | const db = client.db('videos'); 40 | // GridFS Collection 41 | db.collection('fs.files').findOne({}, (err, video) => { 42 | if (!video) { 43 | res.status(404).send("No video uploaded!"); 44 | return; 45 | } 46 | 47 | // Create response headers 48 | const videoSize = video.length; 49 | const start = Number(range.replace(/\D/g, "")); 50 | const end = videoSize - 1; 51 | 52 | const contentLength = end - start + 1; 53 | const headers = { 54 | "Content-Range": `bytes ${start}-${end}/${videoSize}`, 55 | "Accept-Ranges": "bytes", 56 | "Content-Length": contentLength, 57 | "Content-Type": "video/mp4", 58 | }; 59 | 60 | // HTTP Status 206 for Partial Content 61 | res.writeHead(206, headers); 62 | 63 | const bucket = new mongodb.GridFSBucket(db); 64 | const downloadStream = bucket.openDownloadStreamByName('bigbuck', { 65 | start 66 | }); 67 | 68 | // Finally pipe video to response 69 | downloadStream.pipe(res); 70 | }); 71 | }); 72 | }); 73 | 74 | app.listen(8000, function () { 75 | console.log("Listening on port 8000!"); 76 | }); 77 | -------------------------------------------------------------------------------- /mongo-http-video/package-lock.json: -------------------------------------------------------------------------------- 1 | { 2 | "name": "http-video-stream", 3 | "version": "1.0.0", 4 | "lockfileVersion": 1, 5 | "requires": true, 6 | "dependencies": { 7 | "abbrev": { 8 | "version": "1.1.1", 9 | "resolved": "https://registry.npmjs.org/abbrev/-/abbrev-1.1.1.tgz", 10 | "integrity": "sha512-nne9/IiQ/hzIhY6pdDnbBtz7DjPTKrY00P/zvPSm5pOFkl6xuGrGnXn/VtTNNfNtAfZ9/1RtehkszU9qcTii0Q==" 11 | }, 12 | 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-------------------------------------------------------------------------------- /mongo-http-video/package.json: -------------------------------------------------------------------------------- 1 | { 2 | "name": "http-video-stream", 3 | "version": "1.0.0", 4 | "description": "", 5 | "main": "index.js", 6 | "scripts": { 7 | "start": "nodemon index.js" 8 | }, 9 | "author": "", 10 | "license": "ISC", 11 | "dependencies": { 12 | "express": "^4.17.1", 13 | "mongodb": "^3.6.3", 14 | "nodemon": "^2.0.20" 15 | } 16 | } 17 | -------------------------------------------------------------------------------- /mongo-http-video/typings/jsconfig.json: -------------------------------------------------------------------------------- 1 | { 2 | "compilerOptions": { 3 | "module": "commonjs", 4 | "target": "es6" 5 | }, 6 | "exclude": ["node_modules"] 7 | } -------------------------------------------------------------------------------- /multi-quality-video-player/.eslintrc.json: -------------------------------------------------------------------------------- 1 | { 2 | "extends": "next/core-web-vitals" 3 | } -------------------------------------------------------------------------------- /multi-quality-video-player/.gitignore: -------------------------------------------------------------------------------- 1 | # See https://help.github.com/articles/ignoring-files/ for more about ignoring files. 2 | 3 | # dependencies 4 | /node_modules 5 | /.pnp 6 | .pnp.js 7 | 8 | # testing 9 | /coverage 10 | 11 | # next.js 12 | /.next/ 13 | /out/ 14 | 15 | # production 16 | /build 17 | 18 | # misc 19 | .DS_Store 20 | *.pem 21 | 22 | # debug 23 | npm-debug.log* 24 | yarn-debug.log* 25 | yarn-error.log* 26 | .pnpm-debug.log* 27 | 28 | # local env files 29 | .env*.local 30 | 31 | # vercel 32 | .vercel 33 | 34 | # typescript 35 | *.tsbuildinfo 36 | next-env.d.ts 37 | *.db -------------------------------------------------------------------------------- /multi-quality-video-player/README.md: -------------------------------------------------------------------------------- 1 | ![](https://raw.githubusercontent.com/Abdisalan/blog-code-examples/assets/multi-quality-video-player.png) 2 | 3 | ## Dependencies 4 | This project requires that `ffmpeg` is installed❗ 5 | 6 | You'll also need to provide the `PATH` to ffmpeg in `lib/ffmpeg.ts` 7 | ```typescript 8 | // in lib/ffmpeg.ts 9 | const FFMPEG_PATH = '/usr/bin/ffmpeg' 10 | ``` 11 | > 🛈 This project was developed on Linux so I'm not sure how or if it'll work on Windows. 12 | 13 | ## Getting Started 14 | First, initialize the database❗ 15 | ```bash 16 | npm run init-db 17 | ``` 18 | 19 | Then, create the public folder and run the development server: 20 | 21 | ```bash 22 | mkdir -p public 23 | npm run dev 24 | ``` 25 | 26 | Open [http://localhost:3000](http://localhost:3000) with your browser to see the result. 27 | -------------------------------------------------------------------------------- /multi-quality-video-player/components/InfiniteLoading.svg: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | -------------------------------------------------------------------------------- /multi-quality-video-player/components/VideoPlayer.tsx: -------------------------------------------------------------------------------- 1 | import { useRef, SyntheticEvent, useState } from "react" 2 | import styles from "../styles/VideoPlayer.module.css" 3 | import { Video } from "../lib/db" 4 | 5 | const VideoPlayer = ({ video }: { video: Video }) => { 6 | const videoRef = useRef(null) 7 | const sourceRef = useRef(null) 8 | const [playText, setPlayText] = useState("Play") 9 | 10 | type SelectHandler = (a: SyntheticEvent) => void 11 | const onSelectHandler: SelectHandler = (event) => { 12 | // get rid of the warnings 13 | if (videoRef.current == null) return 14 | if (sourceRef.current == null) return 15 | if (!(event.target instanceof HTMLSelectElement)) return 16 | 17 | // Remember what timestamp the video is at 18 | const timestamp = videoRef.current.currentTime 19 | // Get the new source filename 20 | const src = event.target.value 21 | // Change the source of the video 22 | const wasPlaying = playText === "Pause" 23 | videoRef.current.pause() 24 | sourceRef.current.src = src 25 | videoRef.current.load() 26 | videoRef.current.currentTime = timestamp 27 | 28 | // resume the video if it was playing 29 | if (wasPlaying) { 30 | videoRef.current.play() 31 | } 32 | } 33 | 34 | const onPlayHandler = (event: SyntheticEvent) => { 35 | if (videoRef.current == null) return 36 | const video = videoRef.current 37 | // check if playing 38 | if (video.currentTime > 0 && !video.paused && !video.ended && video.readyState > 2) { 39 | setPlayText("Play") 40 | video.pause() 41 | } else { 42 | setPlayText("Pause") 43 | video.play() 44 | } 45 | } 46 | 47 | return ( 48 |
49 |
50 | 53 | 54 | 59 |
60 |
61 | ) 62 | } 63 | 64 | export default VideoPlayer -------------------------------------------------------------------------------- /multi-quality-video-player/init-db.js: -------------------------------------------------------------------------------- 1 | const sqlite3 = require('sqlite3') 2 | 3 | function createDatabase() { 4 | let newdb = new sqlite3.Database('video-metadata.db', (err) => { 5 | if (err) { 6 | console.error(`Error creating db:${err}`) 7 | } 8 | newdb.exec(` 9 | create table video_metadata ( 10 | video_title text primary key not null, 11 | filepath_1080p text, 12 | filepath_720p text, 13 | filepath_360p text, 14 | filepath_144p text 15 | ) 16 | `) 17 | }) 18 | newdb.close() 19 | } 20 | 21 | createDatabase() -------------------------------------------------------------------------------- /multi-quality-video-player/lib/db.ts: -------------------------------------------------------------------------------- 1 | import sqlite3 from 'sqlite3' 2 | 3 | const DATABASE_FILE = "video-metadata.db" 4 | 5 | function openDatabase(): sqlite3.Database { 6 | let db = new sqlite3.Database(DATABASE_FILE, sqlite3.OPEN_READWRITE, (err: any) => { 7 | if (err) { 8 | console.error(`Error opening db: ${err}`) 9 | } 10 | }) 11 | return db 12 | } 13 | 14 | const db = openDatabase() 15 | 16 | export type Resolution = { 17 | filePath: string 18 | size: string 19 | } 20 | 21 | export type Video = { 22 | title: string 23 | resolutions: Resolution[] 24 | } 25 | 26 | export interface VideoDb { 27 | getAllVideos(): Promise 28 | insertVideo(video: Video): Promise 29 | } 30 | 31 | class SqliteVideoDb implements VideoDb { 32 | private formatVideo({ video_title, filepath_1080p, filepath_720p, filepath_360p, filepath_144p }: any): Video { 33 | const resolutions: Resolution[] = [] 34 | filepath_1080p && resolutions.push({ filePath: filepath_1080p, size: "1080p" }) 35 | filepath_720p && resolutions.push({ filePath: filepath_720p, size: "720p" }) 36 | filepath_360p && resolutions.push({ filePath: filepath_360p, size: "360p" }) 37 | filepath_144p && resolutions.push({ filePath: filepath_144p, size: "144p" }) 38 | return { 39 | title: video_title, 40 | resolutions 41 | } as Video 42 | } 43 | 44 | getAllVideos(): Promise { 45 | return new Promise(resolve => { 46 | db.all(`select * from video_metadata`, (err, rows) => { 47 | resolve(rows.map(this.formatVideo)) 48 | }) 49 | }) 50 | } 51 | 52 | async insertVideo(video: Video): Promise { 53 | const videosPaths = video.resolutions.map(({ filePath }) => `"${filePath}"`).join(",") 54 | 55 | await new Promise((resolve, reject) => { 56 | db.exec(` 57 | insert into video_metadata 58 | (video_title, filepath_1080p, filepath_720p, filepath_360p, filepath_144p) 59 | values ("${video.title}", ${videosPaths}) 60 | `, (err) => { 61 | if (err) { 62 | console.log(err) 63 | reject() 64 | } 65 | resolve() 66 | }) 67 | }) 68 | } 69 | } 70 | 71 | export default new SqliteVideoDb() -------------------------------------------------------------------------------- /multi-quality-video-player/lib/ffmpeg.ts: -------------------------------------------------------------------------------- 1 | import { execFile } from "child_process" 2 | 3 | const FFMPEG_PATH = '/usr/bin/ffmpeg' 4 | 5 | export function convertVideo(src: string, out: string, resolution: string): Promise { 6 | 7 | const args = [ 8 | "-i", src, // input video 9 | "-c:v", "libx264", // copy video with codec h264 10 | "-crf", "26", // quality, the higher the worse (but better compression), 51 max 11 | "-s", resolution, // convert resolution 12 | "-pix_fmt", "yuv420p", // pixel color format 13 | "-map", "0", // include all streams from the input into the output 14 | out // output file 15 | ] 16 | 17 | return new Promise((resolve, reject) => { 18 | execFile(FFMPEG_PATH, args, (error, stdout, stderr) => { 19 | if (error) { 20 | reject(error) 21 | return 22 | } 23 | // I haven't looked into why but it always shows up in stderr 24 | resolve(stderr) 25 | }) 26 | }) 27 | } 28 | 29 | export const RESOLUTIONS = [ 30 | { size: "720p", dimensions: "1280x720" }, 31 | { size: "360p", dimensions: "640x360" }, 32 | { size: "144p", dimensions: "256x144" } 33 | ] -------------------------------------------------------------------------------- /multi-quality-video-player/next.config.js: -------------------------------------------------------------------------------- 1 | /** @type {import('next').NextConfig} */ 2 | const nextConfig = { 3 | reactStrictMode: true, 4 | swcMinify: true, 5 | } 6 | 7 | module.exports = nextConfig 8 | -------------------------------------------------------------------------------- /multi-quality-video-player/package.json: -------------------------------------------------------------------------------- 1 | { 2 | "name": "multi-quality-video-player", 3 | "version": "0.1.0", 4 | "private": true, 5 | "scripts": { 6 | "dev": "next dev", 7 | "build": "next build", 8 | "start": "next start", 9 | "lint": "next lint", 10 | "init-db": "node init-db.js" 11 | }, 12 | "dependencies": { 13 | "formidable": "^3.2.5", 14 | "next": "13.0.0", 15 | "react": "18.2.0", 16 | "react-dom": "18.2.0", 17 | "sqlite3": "^5.1.2" 18 | }, 19 | "devDependencies": { 20 | "@types/formidable": "^2.0.5", 21 | "@types/node": "18.11.7", 22 | "@types/react": "18.0.23", 23 | "@types/react-dom": "18.0.7", 24 | "eslint": "8.26.0", 25 | "eslint-config-next": "13.0.0", 26 | "typescript": "4.8.4" 27 | } 28 | } -------------------------------------------------------------------------------- /multi-quality-video-player/pages/_app.tsx: -------------------------------------------------------------------------------- 1 | import '../styles/globals.css' 2 | import type { AppProps } from 'next/app' 3 | 4 | export default function App({ Component, pageProps }: AppProps) { 5 | return 6 | } 7 | -------------------------------------------------------------------------------- /multi-quality-video-player/pages/api/upload.ts: -------------------------------------------------------------------------------- 1 | import type { NextApiRequest, NextApiResponse } from 'next' 2 | import { promises } from 'fs' 3 | import { IncomingForm } from 'formidable' 4 | import { convertVideo, RESOLUTIONS } from '../../lib/ffmpeg'; 5 | import InMemoryVideoDb, { Video } from '../../lib/db' 6 | 7 | export const config = { 8 | api: { 9 | bodyParser: false, 10 | }, 11 | } 12 | 13 | type ProcessFileResult = { 14 | status: number 15 | response: string 16 | } 17 | 18 | export default async function handler(req: NextApiRequest, res: NextApiResponse) { 19 | const form = new IncomingForm({ uploadDir: 'public' }) 20 | 21 | const { status, response } = await new Promise(resolve => form.parse(req, async (err, fields, files) => { 22 | if (err) { 23 | resolve({ status: 500, response: `${err}` }) 24 | return 25 | } 26 | // type check 27 | if (!Array.isArray(files.video)) { 28 | resolve({ status: 400, response: `Give a file` }) 29 | return 30 | } 31 | const { filepath, originalFilename } = files.video[0] 32 | // type check 33 | if (!originalFilename) { 34 | resolve({ status: 500, response: `There's no originalFilename...?` }) 35 | return 36 | } 37 | 38 | // rename file to its original name 39 | const publicFolder = `${process.cwd()}/public/` 40 | const originalFilePath = `${publicFolder}${originalFilename}` 41 | const [originalFileBase, originalFileExt] = originalFilename?.split('.') 42 | await promises.rename(filepath, originalFilePath) 43 | 44 | // convert video to 720p & 360p & 144p (assuming its 1080p) 45 | const resolutionPaths = RESOLUTIONS.map(({ size, dimensions }) => { 46 | return { size, dimensions, filePath: `${originalFileBase}__${size}.${originalFileExt}` } 47 | }) 48 | await Promise.all(resolutionPaths.map(({ filePath, dimensions }) => 49 | convertVideo(originalFilePath, `${publicFolder}${filePath}`, dimensions) 50 | )) 51 | InMemoryVideoDb.insertVideo({ 52 | title: originalFileBase, resolutions: [ 53 | { filePath: originalFilename, size: '1080p' }, 54 | ...resolutionPaths 55 | ] 56 | } as Video) 57 | resolve({ status: 200, response: `Done.` }) 58 | })) 59 | 60 | res.status(status).json(response) 61 | } -------------------------------------------------------------------------------- /multi-quality-video-player/pages/api/videos.ts: -------------------------------------------------------------------------------- 1 | import type { NextApiRequest, NextApiResponse } from 'next' 2 | import SqliteVideoDb, { Video } from '../../lib/db' 3 | 4 | export default async function handler(req: NextApiRequest, res: NextApiResponse) { 5 | const videos = await SqliteVideoDb.getAllVideos() 6 | res.status(200).json(videos) 7 | } -------------------------------------------------------------------------------- /multi-quality-video-player/pages/index.tsx: -------------------------------------------------------------------------------- 1 | import { GetServerSideProps, InferGetServerSidePropsType } from 'next' 2 | import Head from 'next/head' 3 | import styles from '../styles/Home.module.css' 4 | 5 | import SqliteVideoDb, { Video } from '../lib/db' 6 | import Link from 'next/link' 7 | import VideoPlayer from '../components/VideoPlayer' 8 | 9 | export const getServerSideProps: GetServerSideProps<{ videos: Video[] }> = async (ctx) => { 10 | const videos = await SqliteVideoDb.getAllVideos() 11 | return { 12 | props: { videos } 13 | } 14 | } 15 | 16 | function Home({ videos }: InferGetServerSidePropsType) { 17 | return ( 18 |
19 | 20 | Multi Quality Video Player 21 | 22 | 23 | 24 |
25 | {videos.length === 0 ? ( 26 |
27 |

No Video

28 | Upload a video 29 |
30 | ) : ( 31 | 32 | ) 33 | } 34 |
35 |
36 | ) 37 | } 38 | 39 | export default Home 40 | -------------------------------------------------------------------------------- /multi-quality-video-player/pages/upload.tsx: -------------------------------------------------------------------------------- 1 | import { useRouter } from "next/router" 2 | import Image from "next/image" 3 | import { useRef, MouseEvent, useState } from "react" 4 | import styles from '../styles/Upload.module.css' 5 | import InfiniteLoading from '../components/InfiniteLoading.svg' 6 | 7 | export default function UploadPage() { 8 | const inputFileRef = useRef(null) 9 | const router = useRouter() 10 | const [loading, setLoading] = useState(false) 11 | 12 | const handleSubmit = async (event: MouseEvent) => { 13 | if (!(inputFileRef.current instanceof HTMLInputElement)) return 14 | if (!inputFileRef.current.files?.length) return 15 | 16 | event.preventDefault() 17 | const formData = new FormData() 18 | formData.append('video', inputFileRef.current.files[0]) 19 | 20 | setLoading(true) 21 | await fetch('/api/upload', { 22 | method: 'POST', 23 | body: formData 24 | }) 25 | 26 | // redirect to home page to watch video 27 | router.push('/') 28 | } 29 | 30 | return ( 31 |
32 |
33 |

Upload + Convert

34 | 35 | 36 | 37 | 38 | {loading ? Loading... : null} 39 |
40 |
41 | ) 42 | } -------------------------------------------------------------------------------- /multi-quality-video-player/styles/Home.module.css: -------------------------------------------------------------------------------- 1 | .container { 2 | padding: 0 2rem; 3 | } 4 | 5 | .main div { 6 | min-height: 75vh; 7 | padding: 4rem 0; 8 | flex: 1; 9 | display: flex; 10 | flex-direction: column; 11 | justify-content: center; 12 | align-items: center; 13 | } 14 | 15 | .title a { 16 | color: #0070f3; 17 | text-decoration: none; 18 | } 19 | 20 | .title a:hover, 21 | .title a:focus, 22 | .title a:active { 23 | text-decoration: underline; 24 | } 25 | 26 | .title { 27 | margin: 0; 28 | line-height: 1.15; 29 | font-size: 2rem; 30 | } 31 | 32 | .title, 33 | .description { 34 | text-align: center; 35 | } 36 | 37 | .description { 38 | margin: 4rem 0; 39 | line-height: 1.5; 40 | font-size: 1.5rem; 41 | } 42 | 43 | .code { 44 | background: #fafafa; 45 | border-radius: 5px; 46 | padding: 0.75rem; 47 | font-size: 1.1rem; 48 | font-family: Menlo, Monaco, Lucida Console, Liberation Mono, DejaVu Sans Mono, 49 | Bitstream Vera Sans Mono, Courier New, monospace; 50 | } 51 | 52 | .grid { 53 | display: flex; 54 | align-items: center; 55 | justify-content: center; 56 | flex-wrap: wrap; 57 | max-width: 800px; 58 | } 59 | 60 | .card { 61 | margin: 1rem; 62 | padding: 1.5rem; 63 | text-align: left; 64 | color: inherit; 65 | text-decoration: none; 66 | border: 1px solid #eaeaea; 67 | border-radius: 10px; 68 | transition: color 0.15s ease, border-color 0.15s ease; 69 | max-width: 300px; 70 | } 71 | 72 | .card:hover, 73 | .card:focus, 74 | .card:active { 75 | color: #0070f3; 76 | border-color: #0070f3; 77 | } 78 | 79 | .card h2 { 80 | margin: 0 0 1rem 0; 81 | font-size: 1.5rem; 82 | } 83 | 84 | .card p { 85 | margin: 0; 86 | font-size: 1.25rem; 87 | line-height: 1.5; 88 | } 89 | 90 | .logo { 91 | height: 1em; 92 | margin-left: 0.5rem; 93 | } 94 | 95 | @media (max-width: 600px) { 96 | .grid { 97 | width: 100%; 98 | flex-direction: column; 99 | } 100 | } 101 | 102 | @media (prefers-color-scheme: dark) { 103 | 104 | .card, 105 | .footer { 106 | border-color: #222; 107 | } 108 | 109 | .code { 110 | background: #111; 111 | } 112 | 113 | .logo img { 114 | filter: invert(1); 115 | } 116 | } -------------------------------------------------------------------------------- /multi-quality-video-player/styles/Upload.module.css: -------------------------------------------------------------------------------- 1 | .container { 2 | padding: 0 2rem; 3 | display: flex; 4 | flex-direction: column; 5 | justify-content: center; 6 | align-items: center; 7 | height: 75vh; 8 | } 9 | 10 | .main { 11 | padding: 2rem; 12 | display: flex; 13 | flex-direction: column; 14 | justify-content: center; 15 | border: 1px solid black; 16 | border-radius: 5px; 17 | transition: height 0.5s; 18 | } 19 | 20 | .main h1 { 21 | font-size: 2rem; 22 | } 23 | 24 | .main img { 25 | width: 100%; 26 | } -------------------------------------------------------------------------------- /multi-quality-video-player/styles/VideoPlayer.module.css: -------------------------------------------------------------------------------- 1 | .play { 2 | position: absolute; 3 | left: 10px; 4 | bottom: 10%; 5 | box-shadow: 3px 3px rgba(0, 0, 0, 0.5); 6 | font-size: 2rem; 7 | } 8 | 9 | .select { 10 | position: absolute; 11 | right: 10px; 12 | bottom: 10%; 13 | box-shadow: 3px 3px rgba(0, 0, 0, 0.5); 14 | font-size: 2rem; 15 | } 16 | 17 | .videoContainer { 18 | width: 1080px; 19 | position: relative; 20 | } 21 | 22 | .video { 23 | width: 100%; 24 | } 25 | -------------------------------------------------------------------------------- /multi-quality-video-player/styles/globals.css: -------------------------------------------------------------------------------- 1 | html, 2 | body { 3 | padding: 0; 4 | margin: 0; 5 | font-family: -apple-system, BlinkMacSystemFont, Segoe UI, Roboto, Oxygen, 6 | Ubuntu, Cantarell, Fira Sans, Droid Sans, Helvetica Neue, sans-serif; 7 | } 8 | 9 | a { 10 | color: inherit; 11 | text-decoration: none; 12 | } 13 | 14 | * { 15 | box-sizing: border-box; 16 | } 17 | 18 | @media (prefers-color-scheme: dark) { 19 | html { 20 | color-scheme: dark; 21 | } 22 | body { 23 | color: white; 24 | background: black; 25 | } 26 | } 27 | -------------------------------------------------------------------------------- /multi-quality-video-player/tsconfig.json: -------------------------------------------------------------------------------- 1 | { 2 | "compilerOptions": { 3 | "target": "es5", 4 | "lib": [ 5 | "dom", 6 | "dom.iterable", 7 | "esnext" 8 | ], 9 | "allowJs": true, 10 | "skipLibCheck": true, 11 | "strict": true, 12 | "forceConsistentCasingInFileNames": true, 13 | "noEmit": true, 14 | "esModuleInterop": true, 15 | "module": "esnext", 16 | "moduleResolution": "node", 17 | "resolveJsonModule": true, 18 | "isolatedModules": true, 19 | "jsx": "preserve", 20 | "incremental": true 21 | }, 22 | "include": [ 23 | "next-env.d.ts", 24 | "**/*.ts", 25 | "**/*.tsx" 26 | ], 27 | "exclude": [ 28 | "node_modules" 29 | ] 30 | } -------------------------------------------------------------------------------- /sql-offset/Twitter_ERD.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Abdisalan/blog-code-examples/36f28712e2503c65120eb32adaf323795db34bfe/sql-offset/Twitter_ERD.png -------------------------------------------------------------------------------- /sql-offset/date_pagination.py: -------------------------------------------------------------------------------- 1 | import psycopg2 2 | import time 3 | try: 4 | connection = psycopg2.connect(user = "Abdi", 5 | password = "", 6 | host = "localhost", 7 | port = "5432", 8 | database = "twitter") 9 | 10 | cursor = connection.cursor() 11 | 12 | cursor.execute("SELECT * from tweet ORDER BY created_at DESC, id DESC LIMIT 101") 13 | tweets = cursor.fetchall() 14 | 15 | page_size = 100 16 | next_page_id = (tweets[-1][3], tweets[-1][0]) 17 | s_total = time.time() 18 | for i in range(20000): 19 | # start = time.time() 20 | # print("page %s" % i) 21 | cursor.execute("SELECT * from tweet WHERE (created_at, id) <= (%s,%s) ORDER BY created_at DESC, id DESC LIMIT 101", next_page_id) 22 | tweets = cursor.fetchall() 23 | next_page_id = (tweets[-1][3], tweets[-1][0]) 24 | # end = time.time() 25 | # print(end - start) 26 | e_total = time.time() 27 | print("TOTAL %s" % (e_total - s_total)) 28 | 29 | 30 | 31 | 32 | except (Exception, psycopg2.Error) as error : 33 | print ("Error while connecting to PostgreSQL", error) 34 | finally: 35 | #closing database connection. 36 | if(connection): 37 | cursor.close() 38 | connection.close() 39 | # print("PostgreSQL connection is closed") -------------------------------------------------------------------------------- /sql-offset/id_pagination.py: -------------------------------------------------------------------------------- 1 | import psycopg2 2 | import time 3 | try: 4 | connection = psycopg2.connect(user = "Abdi", 5 | password = "", 6 | host = "localhost", 7 | port = "5432", 8 | database = "twitter") 9 | 10 | cursor = connection.cursor() 11 | 12 | cursor.execute("SELECT * from tweet ORDER BY id DESC LIMIT 101") 13 | tweets = cursor.fetchall() 14 | 15 | page_size = 100 16 | 17 | next_page_id = tweets[-1][0] 18 | s_total = time.time() 19 | for i in range(20000): 20 | start = time.time() 21 | # print("page %s" % i) 22 | cursor.execute("SELECT * from tweet WHERE id <= %s ORDER BY id DESC LIMIT 101", (next_page_id,)) 23 | tweets = cursor.fetchall() 24 | next_page_id = tweets[-1][0] 25 | end = time.time() 26 | if i % 100 == 0: 27 | print("%s,%s" % (i, end - start)) 28 | e_total = time.time() 29 | print("TOTAL %s" % (e_total - s_total)) 30 | 31 | 32 | 33 | 34 | except (Exception, psycopg2.Error) as error : 35 | print ("Error while connecting to PostgreSQL", error) 36 | finally: 37 | #closing database connection. 38 | if(connection): 39 | cursor.close() 40 | connection.close() 41 | # print("PostgreSQL connection is closed") -------------------------------------------------------------------------------- /sql-offset/offset_pagination.py: -------------------------------------------------------------------------------- 1 | import psycopg2 2 | import time 3 | 4 | try: 5 | connection = psycopg2.connect(user = "Abdi", 6 | password = "", 7 | host = "localhost", 8 | port = "5432", 9 | database = "twitter") 10 | 11 | cursor = connection.cursor() 12 | 13 | page_size = 100 14 | s_total = time.time() 15 | for i in range(2000): 16 | start = time.time() 17 | # print("page %s" % i) 18 | cursor.execute("SELECT * from tweet ORDER BY id DESC LIMIT 100 OFFSET %s", (page_size * i,)) 19 | cursor.fetchall() 20 | end = time.time() 21 | if i % 100 == 0: 22 | print("%s,%s" % (end - start,i)) 23 | e_total = time.time() 24 | print("TOTAL %s" % (e_total - s_total)) 25 | 26 | 27 | 28 | except (Exception, psycopg2.Error) as error : 29 | print ("Error while connecting to PostgreSQL", error) 30 | finally: 31 | #closing database connection. 32 | if(connection): 33 | cursor.close() 34 | connection.close() 35 | # print("PostgreSQL connection is closed") -------------------------------------------------------------------------------- /sql-offset/requirements.txt: -------------------------------------------------------------------------------- 1 | astroid==2.4.2 2 | isort==4.3.21 3 | lazy-object-proxy==0.0.0 4 | mccabe==0.6.1 5 | psycopg2==2.8.5 6 | pylint==2.5.3 7 | six==1.15.0 8 | toml==0.10.1 9 | typed-ast==1.4.1 10 | wrapt==1.12.1 11 | -------------------------------------------------------------------------------- /sql-offset/schema.sql: -------------------------------------------------------------------------------- 1 | CREATE TABLE users ( 2 | id SERIAL PRIMARY KEY, 3 | name VARCHAR(100) 4 | ); 5 | 6 | CREATE TABLE tweet ( 7 | id SERIAL PRIMARY KEY, 8 | user_id INTEGER REFERENCES users(id), 9 | content VARCHAR(255), 10 | created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP 11 | ); 12 | 13 | CREATE TABLE user_follower ( 14 | user_id INTEGER REFERENCES users(id), 15 | follower_id INTEGER REFERENCES users(id) 16 | ); 17 | 18 | -------------------------------------------------------------------------------- /sql-offset/seed.py: -------------------------------------------------------------------------------- 1 | import psycopg2 2 | try: 3 | connection = psycopg2.connect(user = "Abdi", 4 | password = "", 5 | host = "localhost", 6 | port = "5432", 7 | database = "twitter") 8 | 9 | cursor = connection.cursor() 10 | 11 | # cursor.execute(''' 12 | # INSERT INTO users (id, name) VALUES 13 | # (11,'User1'), 14 | # (12,'User2'), 15 | # (13,'User3'), 16 | # (14,'User4'), 17 | # (15,'User5'); 18 | # ''') 19 | for i in range(400000): 20 | cursor.execute(''' 21 | INSERT INTO tweet (user_id, content) VALUES 22 | (11, 'sdfsdfsdfsdf'), 23 | (12, 'dfsfsdfs'), 24 | (13, 'sdfsfsdk'), 25 | (14, 'sfsdfwerwesdjfs'), 26 | (15, 'sfdsfsdfsdfdw'); 27 | ''') 28 | connection.commit() 29 | 30 | print("You did it\n") 31 | 32 | 33 | 34 | except (Exception, psycopg2.Error) as error : 35 | print ("Error while connecting to PostgreSQL", error) 36 | finally: 37 | #closing database connection. 38 | if(connection): 39 | cursor.close() 40 | connection.close() 41 | print("PostgreSQL connection is closed") 42 | -------------------------------------------------------------------------------- /sql-offset/timeline.py: -------------------------------------------------------------------------------- 1 | import psycopg2 2 | try: 3 | connection = psycopg2.connect(user = "Abdi", 4 | password = "", 5 | host = "localhost", 6 | port = "5432", 7 | database = "twitter") 8 | 9 | cursor = connection.cursor() 10 | 11 | cursor.execute(''' 12 | SELECT u.name FROM user_follower as uf 13 | JOIN users as u ON u.id = uf.follower_id 14 | WHERE uf.user_id = 11; 15 | ''') 16 | print("Abdi's followers:") 17 | users = cursor.fetchall() 18 | for name in users: 19 | print(name[0]) 20 | 21 | 22 | cursor.execute(''' 23 | SELECT users.name, tweet.content FROM tweet 24 | JOIN users ON users.id = tweet.user_id 25 | ORDER BY tweet.content; 26 | ''') 27 | tweets = cursor.fetchall() 28 | for name, tweet in tweets: 29 | print("%s: %s" % (name, tweet)) 30 | 31 | 32 | 33 | except (Exception, psycopg2.Error) as error : 34 | print ("Error while connecting to PostgreSQL", error) 35 | finally: 36 | #closing database connection. 37 | if(connection): 38 | cursor.close() 39 | connection.close() 40 | print("PostgreSQL connection is closed") --------------------------------------------------------------------------------