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switch to golang wrapper for enet

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Travis Shears 2026-04-13 13:50:21 +02:00
parent 4420b4e061
commit ee3b8d3490
Signed by: travisshears
GPG key ID: CB9BF1910F3F7469
10 changed files with 188 additions and 194 deletions
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50
backend/.gitignore vendored
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# Build results
bin/
obj/
[Dd]ebug/
[Dd]ebugPublic/
[Rr]elease/
[Rr]eleases/
x64/
x86/
[Ww][Ii][Nn]32/
[Aa][Rr][Mm]/
[Aa][Rr][Mm]64/
# Visual Studio
.vs/
.vscode/
*.sln.iml
*.sln.docstates
*.user
*.userprefs
*.userosscache
*.sln.user
# ReSharper
.idea/
*.resharper
*.resharper.user
*.DotSettings.user
_ReSharper*/
*.[Rr]e[Ss]harper
*.sln.iml
# Local environment
.env
.env.local
appsettings.Development.json
# NuGet
.nuget/
*.nupkg
*.snupkg
packages/
# Rider
.idea/
*.sln.iml
*.log
# macOS
.DS_Store

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backend/Backend.csproj
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<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<OutputType>Exe</OutputType>
<TargetFramework>net10.0</TargetFramework>
<LangVersion>latest</LangVersion>
<Nullable>enable</Nullable>
<RootNamespace>Love2DBackend</RootNamespace>
<AssemblyName>Backend</AssemblyName>
</PropertyGroup>
</Project>

54
backend/Dockerfile
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FROM mcr.microsoft.com/dotnet/sdk:10.0 AS build
WORKDIR /build
COPY Backend.csproj .
RUN dotnet restore
COPY . .
RUN dotnet build -c Release
# Build stage
FROM golang:1.25-bookworm AS builder
FROM mcr.microsoft.com/dotnet/runtime:10.0
WORKDIR /app
COPY --from=build /build/bin/Release/net10.0 .
ENV ENET_HOST=0.0.0.0
ENV ENET_PORT=7777
EXPOSE 7777/udp
ENTRYPOINT ["./Backend"]
# Install dependencies including libenet-dev from Debian repos
RUN apt-get update && apt-get install -y --no-install-recommends \
git \
gcc \
pkg-config \
libenet-dev \
sqlite3 \
libsqlite3-dev \
&& rm -rf /var/lib/apt/lists/*
# Copy go mod and sum files
COPY go.mod go.sum ./
# Download dependencies
RUN go mod download
COPY ./*.go .
# Enable CGO for go-sqlite3 and go-enet
ENV CGO_ENABLED=1
RUN go build -o main .
# Runtime stage
FROM debian:bookworm-slim
WORKDIR /app
# Install runtime dependencies
RUN apt-get update && apt-get install -y --no-install-recommends \
libenet7 \
ca-certificates \
&& rm -rf /var/lib/apt/lists/*
COPY --from=builder /app/main .
EXPOSE 8095
CMD ["./main"]

52
backend/Program.cs
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using System;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
namespace Love2DBackend
{
class Program
{
static async Task Main(string[] args)
{
Console.WriteLine("LÖVE2D Backend - UDP Server");
Console.WriteLine("Starting server on port 7777...");
using (var udpServer = new UdpClient(7777))
{
Console.WriteLine("Server listening on 0.0.0.0:7777");
var cts = new CancellationTokenSource();
// Handle Ctrl+C gracefully
Console.CancelKeyPress += (s, e) =>
{
e.Cancel = true;
cts.Cancel();
};
try
{
while (!cts.Token.IsCancellationRequested)
{
var result = await udpServer.ReceiveAsync(cts.Token);
var message = Encoding.UTF8.GetString(result.Buffer);
var clientEndpoint = result.RemoteEndPoint;
Console.WriteLine($"[{clientEndpoint}] {message}");
// Echo back
var response = Encoding.UTF8.GetBytes($"Echo: {message}");
await udpServer.SendAsync(response, response.Length, clientEndpoint);
}
}
catch (OperationCanceledException)
{
Console.WriteLine("Server stopped.");
}
}
}
}
}

82
backend/README.md
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# ENET Gaming Backend
# Löve2D ENET Gaming Backend
A multiplayer game server written in C# using ENet for networking.
A multiplayer game server written in GO Lang wrapping ENet for networking.
Designed to support mutiple of my LÖVE2D game experiments at once.
## Architecture
```
┌─────────────────────────────────────────────────────────────┐
│ LÖVE2D Game Clients │
│ (Fennel/Lua with Love2D Framework) │
└────────────────────────────────┬────────────────────────────┘
│ (UDP via ENet)
│
┌────────────┴────────────┐
│ ENet-CSharp Server │
│ (Multiplayer Backend) │
└────────────┬────────────┘
│
┌────────────┴────────────┐
│ Game State Manager │
│ Session Storage │
│ Player Coordination │
└────────────────────────┘
```
## Technology Stack
- **Language**: C# (.NET)
- **Networking**: [ENet-CSharp](https://github.com/nxrighthere/ENet-CSharp) - reliable UDP multiplayer protocol
- **Deployment**: Docker + Nomad
- **Port**: `7777` (UDP, configurable)
- Language: Go Lang
- Networking:
- https://github.com/codecat/go-enet
- http://enet.bespin.org/index.html
- Docker image
- Nomad deployment
## Quick Start
### Prerequisites
## Local Development
- .NET 8.0 or later
- ENet-CSharp (vendored or via NuGet)
- Docker (for containerization)
### Local Development
```bash
cd backend
dotnet build
dotnet run
```shell
$ docker compose up --build
```
The server will start and listen on `127.0.0.1:7777` by default.
## Prod Deployment
### Testing Connection
With a LÖVE2D client configured to connect to `localhost:7777`:
```bash
love ../two_player_cleaning_game
```shell
$ ./build.sh
```
## Configuration
Server behavior is controlled via environment variables:
```bash
ENET_HOST=0.0.0.0 # Bind address
ENET_PORT=7777 # UDP port
```
## Resources
- [Learn X In Y C#](https://learnxinyminutes.com/csharp/)
## Next Steps
- [ ] Set up C# project structure
- [ ] Integrate ENet-CSharp dependency
- [ ] Implement basic server startup
- [ ] Define message protocol
- [ ] Create player session management
- [ ] Build Docker image
- [ ] Test Nomad deployment
- [ ] Implement game state synchronization
Then go to homelab repo and deploy the nomad job

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backend/build.sh Executable file
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#!/bin/sh
set -e
export AWS_PROFILE=personal
export AWS_REGION=eu-central-1
REPO_NAME="love2d-backend-homelabstack"
if ! aws ecr describe-repositories --repository-names "$REPO_NAME" >/dev/null 2>&1; then
aws ecr create-repository --repository-name "$REPO_NAME"
fi
docker buildx build --platform linux/amd64,linux/arm64 -t 853019563312.dkr.ecr.eu-central-1.amazonaws.com/gemini-capsule-homelabstack:latest --push .
echo "Docker image built and pushed to AWS ECR"

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backend/docker-compose.yml Normal file
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services:
backend:
build:
context: .
dockerfile: Dockerfile
container_name: love2d-backend-dev
ports:
- "8095:8095"

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backend/go.mod Normal file
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module love2d_backend
go 1.25.0
require (
github.com/codecat/go-libs v0.0.0-20210906174629-ffa6674c8e05
github.com/mattn/go-sqlite3 v1.14.32
)
require (
github.com/codecat/go-enet v0.0.0-20250728072647-ae229138f138
github.com/fatih/color v1.19.0 // indirect
github.com/mattn/go-colorable v0.1.14 // indirect
github.com/mattn/go-isatty v0.0.20 // indirect
golang.org/x/sys v0.42.0 // indirect
)

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backend/go.sum Normal file
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github.com/codecat/go-enet v0.0.0-20250728072647-ae229138f138 h1:qQaqly9oVi84i4nLWmM551z7kcFZIy5koCLoPwCarGY=
github.com/codecat/go-enet v0.0.0-20250728072647-ae229138f138/go.mod h1:sXkhNvv8T1d/aPEwipUzk7rGWwGJ3uJST2P/Z0zE0L4=
github.com/codecat/go-libs v0.0.0-20210906174629-ffa6674c8e05 h1:JSfDXHJvrIpQ8Agy//yoIlGpfIprTCDUytmf68fd/Lc=
github.com/codecat/go-libs v0.0.0-20210906174629-ffa6674c8e05/go.mod h1:xJW98cHEb+Kbuu0qmoKzExh3blthZqojIYOFo27VgvE=
github.com/fatih/color v1.19.0 h1:Zp3PiM21/9Ld6FzSKyL5c/BULoe/ONr9KlbYVOfG8+w=
github.com/fatih/color v1.19.0/go.mod h1:zNk67I0ZUT1bEGsSGyCZYZNrHuTkJJB+r6Q9VuMi0LE=
github.com/mattn/go-colorable v0.1.14 h1:9A9LHSqF/7dyVVX6g0U9cwm9pG3kP9gSzcuIPHPsaIE=
github.com/mattn/go-colorable v0.1.14/go.mod h1:6LmQG8QLFO4G5z1gPvYEzlUgJ2wF+stgPZH1UqBm1s8=
github.com/mattn/go-isatty v0.0.20 h1:xfD0iDuEKnDkl03q4limB+vH+GxLEtL/jb4xVJSWWEY=
github.com/mattn/go-isatty v0.0.20/go.mod h1:W+V8PltTTMOvKvAeJH7IuucS94S2C6jfK/D7dTCTo3Y=
github.com/mattn/go-sqlite3 v1.14.32 h1:JD12Ag3oLy1zQA+BNn74xRgaBbdhbNIDYvQUEuuErjs=
github.com/mattn/go-sqlite3 v1.14.32/go.mod h1:Uh1q+B4BYcTPb+yiD3kU8Ct7aC0hY9fxUwlHK0RXw+Y=
golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
golang.org/x/sys v0.42.0 h1:omrd2nAlyT5ESRdCLYdm3+fMfNFE/+Rf4bDIQImRJeo=
golang.org/x/sys v0.42.0/go.mod h1:4GL1E5IUh+htKOUEOaiffhrAeqysfVGipDYzABqnCmw=

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backend/main.go Normal file
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package main
import (
_ "embed"
"log/slog"
"os"
enet "github.com/codecat/go-enet"
_ "github.com/mattn/go-sqlite3"
)
func main() {
port := uint16(8095)
logger := slog.New(slog.NewJSONHandler(os.Stdout, nil))
slog.SetDefault(logger)
// Initialize enet
slog.Info("Initializing E-Net Server", "port", port)
enet.Initialize()
// Create a host listening on 0.0.0.0:8095
host, err := enet.NewHost(enet.NewListenAddress(port), 32, 1, 0, 0)
if err != nil {
slog.Error("Couldn't create host", "error", err)
return
}
slog.Info("Server started", "port", port)
// The event loop
for true {
// Wait until the next event
ev := host.Service(1000)
// Do nothing if we didn't get any event
if ev.GetType() == enet.EventNone {
continue
}
switch ev.GetType() {
case enet.EventConnect: // A new peer has connected
slog.Info("New peer connected", "address", ev.GetPeer().GetAddress())
case enet.EventDisconnect: // A connected peer has disconnected
slog.Info("Peer disconnected", "address", ev.GetPeer().GetAddress())
case enet.EventReceive: // A peer sent us some data
// Get the packet
packet := ev.GetPacket()
// We must destroy the packet when we're done with it
defer packet.Destroy()
// Get the bytes in the packet
packetBytes := packet.GetData()
// Respond "pong" to "ping"
if string(packetBytes) == "ping" {
ev.GetPeer().SendString("pong", ev.GetChannelID(), enet.PacketFlagReliable)
continue
}
// Disconnect the peer if they say "bye"
if string(packetBytes) == "bye" {
slog.Info("Peer sent bye, disconnecting")
ev.GetPeer().Disconnect(0)
continue
}
}
}
// Destroy the host when we're done with it
host.Destroy()
// Uninitialize enet
enet.Deinitialize()
}