https://github.com/lucasteles/backdashgodotsample

Sample of Backdash Rollback net-code with Godot
https://github.com/lucasteles/backdashgodotsample

csharp gamedev godot rollback-netcode

Last synced: about 6 hours ago
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Sample of Backdash Rollback net-code with Godot

• Host: GitHub
• URL: https://github.com/lucasteles/backdashgodotsample
• Owner: lucasteles
• License: mit
• Created: 2024-04-30T18:48:21.000Z (10 months ago)
• Default Branch: master
• Last Pushed: 2024-11-29T23:21:47.000Z (2 months ago)
• Last Synced: 2024-11-30T00:21:52.586Z (2 months ago)
• Topics: csharp, gamedev, godot, rollback-netcode
• Language: C#
• Homepage: https://lucasteles.github.io/Backdash/
• Size: 161 KB
• Stars: 3
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# SpaceWar with Godot

This project is a usage sample of [rollback netcode](https://lucasteles.github.io/Backdash/docs/introduction.html#how-does-it-work) using [Backdash](https://github.com/lucasteles/Backdash) in [Godot](https://godotengine.org/).

It shows a basic example of an online lobby for NAT traversal using [UDP hole punching](https://en.wikipedia.org/wiki/UDP_hole_punching).

## Video

[![Godot Online](https://img.youtube.com/vi/8M8QnTiJZzA/default.jpg)](https://youtu.be/8M8QnTiJZzA)

# How does it work?

This enables a P2P connection over the internet, this is possible using

a [middle server](https://github.com/lucasteles/Backdash/tree/master/samples/LobbyServer)

which all clients know.

The server catches the IP address and port of a client and sends it to the others.

The current server runs almost as a simple HTTP with JSON responses. It keeps the lobby info with sliding expiration

cache.

When a client enters the lobby the server responds with a token of type `Guid`/`UUID`. It is used a very

basic `Authentication` mechanism.

The client uses HTTP pooling to get updated information on each lobby member/peer.

When logged in, every client needs to send a `UDP` package with their token to the server. The server uses the package header metadata  

to keep track of their `IP` and open `Port`.

> ⚠️ UDP Hole punching usually **does not** work with clients behind the same NAT. To mitigate this the server

> also tracks the local IP and port on each client to check if the peer is on the same network.

## Controls

- **Arrows**: Move

- **Space**: Fire

- **Left Ctrl**: Missile

## Running

### Server

> [!NOTE]

> This project uses an already published [demo lobby server](https://lobby-server.fly.dev/swagger/index.html).

The server URL is configured in the `settings.ini` file and you can start your own [server from here](https://github.com/lucasteles/Backdash/tree/master/samples/LobbyServer):

After cloning the repository run this command on the server project directory:

```bash

dotnet run .

```

- Default **HTTP**: `9999`

- Default **UDP** : `8888`

> [!TIP]

> 💡 Check the swagger `API` docs at http://localhost:9999/swagger