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1 | # Server code documentation | ||
2 | |||
3 | The server is a web server developed with [TypeScript](https://www.typescriptlang.org/)/[Express](http://expressjs.com). | ||
4 | |||
5 | |||
6 | ## Technologies | ||
7 | |||
8 | * [TypeScript](https://www.typescriptlang.org/) -> Language | ||
9 | * [PostgreSQL](https://www.postgresql.org/) -> Database | ||
10 | * [Express](http://expressjs.com) -> Web server framework | ||
11 | * [Sequelize](http://docs.sequelizejs.com/en/v3/) -> SQL ORM | ||
12 | * [WebTorrent](https://webtorrent.io/) -> BitTorrent tracker and torrent creation | ||
13 | * [Mocha](https://mochajs.org/) -> Test framework | ||
14 | |||
15 | |||
16 | ## Files | ||
17 | |||
18 | The server main file is [server.ts](https://github.com/Chocobozzz/PeerTube/blob/master/server.ts). | ||
19 | The server modules description are in the [package.json](https://github.com/Chocobozzz/PeerTube/blob/master/package.json) at the project root. | ||
20 | All other server files are in the [server](https://github.com/Chocobozzz/PeerTube/tree/master/server) directory: | ||
21 | |||
22 | server.ts -> app initilization, main routes configuration (static routes...) | ||
23 | config -> server YAML configurations (for tests, production...) | ||
24 | scripts -> Scripts files for npm run | ||
25 | server | ||
26 | |__ controllers -> API routes/controllers files | ||
27 | |__ helpers -> functions used by different part of the project (logger, utils...) | ||
28 | |__ initializers -> functions used at the server startup (installer, database, constants...) | ||
29 | |__ lib -> library function (WebTorrent, OAuth2, friends logic...) | ||
30 | |__ middlewares -> middlewares for controllers (requests validators, requests pagination...) | ||
31 | |__ models -> Sequelize models for each SQL tables (videos, users, accounts...) | ||
32 | |__ tests -> API tests and real world simulations (to test the decentralized feature...) | ||
33 | |||
34 | |||
35 | ## Conventions | ||
36 | |||
37 | Uses [JavaScript Standard Style](http://standardjs.com/). | ||
38 | |||
39 | |||
40 | ## Developing | ||
41 | |||
42 | * Install [the dependencies](https://github.com/Chocobozzz/PeerTube#dependencies) | ||
43 | * Run `yarn install` at the root directory to install all the dependencies | ||
44 | * Run PostgreSQL and create the database `peertube_dev`. | ||
45 | * Run `npm run dev:server` to run the server, watch server files modifications and restart it automatically. The server (API + client) listen on `localhost:9000`. | ||
46 | |||
47 | The `NODE_ENV=test` is set to speed up communications between instances (see [constants.ts](https://github.com/Chocobozzz/PeerTube/blob/master/server/initializers/constants.ts)). | ||
48 | |||
49 | `npm run help` gives you all available commands. | ||
50 | |||
51 | If you want to test the decentralization feature, you can easily run 3 instances by running `npm run play`. The instances password are `test1`, `test2` and `test3`. | ||
52 | |||
53 | |||
54 | ## Architecture | ||
55 | |||
56 | The server is composed by: | ||
57 | |||
58 | * a REST API (Express framework) | ||
59 | * a WebTorrent Tracker | ||
60 | |||
61 | A video is seeded by the server with the [WebSeed](http://www.bittorrent.org/beps/bep_0019.html) protocol (HTTP). | ||
62 | |||
63 | ![Architecture scheme](https://github.com/Chocobozzz/PeerTube/blob/master/support/doc/server/upload-video.png) | ||
64 | |||
65 | When a user uploads a video, the rest API create the torrent file and then adds it to its database. | ||
66 | |||
67 | If a user wants to watch the video, the tracker will indicate all other users that are watching the video + the HTTP url for the WebSeed. | ||
68 | |||
69 | ## Newcomers | ||
70 | |||
71 | The server entrypoint is [server.ts](https://github.com/Chocobozzz/PeerTube/blob/master/server.ts). You can begin to look at this file. | ||
72 | Then you can try to understand the [controllers](https://github.com/Chocobozzz/PeerTube/tree/master/server/controllers): they are the entrypoint of each API request. | ||
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