# Server code documentation
-The server is a web server developed with [NodeJS](https://nodejs.org)/[Express](http://expressjs.com).
+The server is a web server developed with [TypeScript](https://www.typescriptlang.org/)/[Express](http://expressjs.com).
## Technologies
- * [NodeJS](https://nodejs.org) -> Language
- * [MongoDB](https://www.mongodb.com/) -> Database
+ * [TypeScript](https://www.typescriptlang.org/) -> Language
+ * [PostgreSQL](https://www.postgresql.org/) -> Database
* [Express](http://expressjs.com) -> Web server framework
- * [Mongoose](http://mongoosejs.com/) -> MongoDB object modeling
- * [WebTorrent](https://webtorrent.io/) -> BitTorrent over WebRTC
- * [Electron](http://electron.atom.io/) -> To make WebRTC inside NodeJS
+ * [Sequelize](http://docs.sequelizejs.com/en/v3/) -> SQL ORM
+ * [WebTorrent](https://webtorrent.io/) -> BitTorrent tracker and torrent creation
* [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 main file is [server.ts](https://github.com/Chocobozzz/PeerTube/blob/master/server.ts).
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...)
+ server.ts -> app initilization, main routes configuration (static routes...)
config -> server YAML configurations (for tests, production...)
scripts -> Scripts files for npm run
server
|__ 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 -> Mongoose models for each MongoDB collection (videos, users, pods...)
+ |__ models -> Sequelize models for each SQL tables (videos, users, pods...)
|__ tests -> API tests and real world simulations (to test the decentralized feature...)
* Install [the dependencies](https://github.com/Chocobozzz/PeerTube#dependencies)
* Run `npm install` at the root directory to install all the dependencies
- * Run MongoDB
- * 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`
+ * Run PostgreSQL and create the database `peertube_dev`.
+ * Run `npm run dev:server` to compile the client, run the server and watch server files modifications.
-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#L71)).
+The `NODE_ENV=test` is set to speed up communications between pods (see [constants.ts](https://github.com/Chocobozzz/PeerTube/blob/master/server/initializers/constants.ts)).
-`npm run help` give you all available commands.
+`npm run help` gives you all available commands.
-If you want to test the decentralization feature, you can easily run 3 pods by runnin `npm run play`. The pods password are `test1`, `test2` and `test3`.
+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`.
## Architecture
The server is composed by:
- * a REST API
+ * a REST API (throught Express framework)
* a WebTorrent Tracker
- * A separate Electron process
-The seperate Electron process has the goal to seed videos through WebRTC because WebRTC directly in NodeJS is not usable for now.
+A video is seeded by the server throught the [WebSeed](http://www.bittorrent.org/beps/bep_0019.html) protocol (HTTP).
![Architecture scheme](https://github.com/Chocobozzz/PeerTube/blob/master/support/doc/server/upload-video.png)
-When an user upload a video, the rest API asks the Electron process to seed it (communicate with IPC) and then adds it to its Mongo database.
+When a user uploads a video, the rest API create the torrent file and then adds it to its database.
-If an user wants to watch the video, the tracker will indicate all other users that are watching the video + the Electron process.
+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.
## Newcomers
-The server entrypoint is [server.js](https://github.com/Chocobozzz/PeerTube/blob/master/server.js). You can begin to look at this file.
+The server entrypoint is [server.ts](https://github.com/Chocobozzz/PeerTube/blob/master/server.ts). 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.