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gogs: Golang Game Server Framework

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gogs is a simple, fast and lightweight game server framework written in golang. It is designed to be easy to use and easy to extend. It will generate logic code from protobuf files, and you can use it to develop your game server. It's also a good starting point for you to learn golang. It supports websocket and webrtc datachannel.

Untiy Meta City Demo Online

TODO

Getting Started

Prerequisites

Go >= 1.21
Protobuf

Init your project

install the gogs

go install github.com/metagogs/gogs/tools/gogs@v0.2.4

init project

mkdir yourgame
cd yourgame
gogs init -p yourgame

Flags:
 -p your go package name

edit your proto, add the game message, then generate the code

gogs go -f data.proto

Flags:
 -f proto file path

run your game server

go mod tidy
go run main.go

Generated Project

internal/
    logic/
        baseworld/
            bind_user_logic.go
    server/
        server.go
    svc/
        service_context.go
model/
    data.ep.go
    data.pb.go
config.yaml     
data.proto      
main.go

Generated Unity C# Code

this will generate a unity code, you can use it to test your game server. And you need use the Unity Protobuf to run the code.

 gogs csharp -f data.proto

 Flags:
 -f proto file path
 -g generate unity c# gogs library, you should use it when you generate code first time

Deployment

gogo docker // generate Dockerfile

go run main --deployment // generate k8s yaml
--svc use service to expose your game server not hostport
--name your game server name
--namepsace your k8s namespace

How to encode/decode the message

Packet Protocol

gogs uses 8 bytes as the protocol header

protocol header = flag + version + action index + message data length

0     byte  flag         8bit    protocol flag, awalys 0x7E 
1     byte  version      5bit    protocel version
            encodeType   3bit    protocel encode type
2     byte  packetType   2bit    packet message type 1 system 2 server
            component    6bit    message component index
3.4   byte  action       16bit   message action index
5.6.7 byte  length       24bit   message length

What is the action index

action index = packetType + component index + action index

// @gogs:Components
message Components {
    BaseWorld BaseWorld = 1; // 1 is the component index
}

message BaseWorld {
    BindUser BindUser = 1; // 1 is the action index

    BindSuccess BindSuccess = 2; // 2 is the action index
}
message BindUser {
    string uid = 1;
}


// @gogs:ServerMessage
message BindSuccess {
}

like this proto, the BindUser and BindSuccess is the message comunication between client and server

BindUser action index = packetType <<22 | component <<16 | action = 2 << 22 | 1 << 16 | 1 = 0x810001

BindSuccess action index = packetType <<22 | component <<16 | action = 2 << 22 | 1 << 16 | 2 = 0x810002

Packet encode & decode

gogs has three encode&decode types - encodeType in protocol header

0 json encode&decode without protocol header
1 json encode&decode with protocol header
2 protobuf encode&decode with protocol header

Packet message

message with encode type 0 (json without protocol header)

message = JSON binary data

gogs retrieves the action index from the message, then gets the filed type and decodes the message, finally it calls the logic function. The json message without protocol header should add a filed named action, the value is the filed name

{
	"action": "BindUser",
	"uid": "123"
}

app.UseDefaultEncodeJSONWithHeader()

message with encode type 1 (json with protocol header)

message = 8 bytes protocol header + JSON binary data

app.UseDefaultEncodeJSON()

message with encode type 2 (protobuf with protocol header)

message = 8 bytes protocol header + protobuf binary data

app.UseDefaultEncodeProto()

Contributing

Running the gogs tests

make test

This command will run both unit and e2e tests.

Demo

License

Apache License Version 2.0