PeerTube/support/doc/server/code.md

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# Server code documentation
The server is a web server developed with [NodeJS](https://nodejs.org)/[Express](http://expressjs.com).
## Technologies
* [NodeJS](https://nodejs.org) -> Language
* [PostgreSQL](https://www.postgresql.org/) -> Database
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* [Express](http://expressjs.com) -> Web server framework
* [Sequelize](http://docs.sequelizejs.com/en/v3/) -> SQL ORM
* [WebTorrent](https://webtorrent.io/) -> BitTorrent tracker and torrent creation
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* [Mocha](https://mochajs.org/) -> Test framework
## Files
The server main file is [server.js](https://github.com/Chocobozzz/PeerTube/blob/master/server.js).
The server modules description are in the [package.json](https://github.com/Chocobozzz/PeerTube/blob/master/package.json) at the project root.
All other server files are in the [server](https://github.com/Chocobozzz/PeerTube/tree/master/server) directory:
server.js -> app initilization, main routes configuration (static routes...)
config -> server YAML configurations (for tests, production...)
scripts -> Scripts files for npm run
server
|__ controllers -> API routes/controllers files
|__ helpers -> functions used by different part of the project (logger, utils...)
|__ initializers -> functions used at the server startup (installer, database, constants...)
|__ lib -> library function (WebTorrent, OAuth2, friends logic...)
|__ middlewares -> middlewares for controllers (requests validators, requests pagination...)
|__ models -> Sequelize models for each SQL tables (videos, users, pods...)
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|__ tests -> API tests and real world simulations (to test the decentralized feature...)
## Conventions
Uses [JavaScript Standard Style](http://standardjs.com/).
## Developing
* Install [the dependencies](https://github.com/Chocobozzz/PeerTube#dependencies)
* Run `npm install` at the root directory to install all the dependencies
* Run PostgreSQL and create the database `peertube_dev`.
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* Run `npm run dev` to compile the client and automatically run the server. If the client files are already compiled you can simply run `NODE_ENV=test node server`
The `NODE_ENV=test` is set to speed up communications between pods (see [constants.js](https://github.com/Chocobozzz/PeerTube/blob/master/server/initializers/constants.js)).
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`npm run help` gives you all available commands.
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If you want to test the decentralization feature, you can easily run 3 pods by running `npm run play`. The pods password are `test1`, `test2` and `test3`.
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## Architecture
The server is composed by:
* a REST API (throught Express framework)
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* a WebTorrent Tracker
A video is seeded by the server throught the [WebSeed](http://www.bittorrent.org/beps/bep_0019.html) protocol (HTTP).
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![Architecture scheme](https://github.com/Chocobozzz/PeerTube/blob/master/support/doc/server/upload-video.png)
When a user uploads a video, the rest API create the torrent file and then adds it to its database.
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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.
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## Newcomers
The server entrypoint is [server.js](https://github.com/Chocobozzz/PeerTube/blob/master/server.js). You can begin to look at this file.
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.