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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
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* [PostgreSQL ](https://www.postgresql.org/ ) -> Database
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* [Express ](http://expressjs.com ) -> Web server framework
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* [Sequelize ](http://docs.sequelizejs.com/en/v3/ ) -> SQL ORM
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* [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...)
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|__ 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
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* 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`
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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:
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* a REST API (throught Express framework)
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* a WebTorrent Tracker
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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 )
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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.