Slow and Simple authoritative game server made in Go intended for turn based games.

The server handles clients, creating rooms and joining.

server responsibilities maintains and reconnects the player connections sends all input requests to the admin player admin player sends all state updates to the server for relaying

Admin - <- input Jugué la carta 3 de mi mani

sequenceDiagram
    Client->>+Server: Connect
    Server->>-Client: Message : Connected

First request from client to server. Should be done after connecting so the server can reconnect if it finds the client id.

sequenceDiagram
    Client->>Server: Login Request
    Note over Client,Server: Username,ClientID
    Server->>Client: Login Response
    Server-->>Client: Reconnect 

{
  "type": "login",
  "content": {
    "username": "John", // 
    "clientid": "", //if set check for reconnect
  }
}

Login Response:

{
  "type": "login",
  "content": {
    "username": "John-1", // checks uniqueness? 
    "clientid": "[09aZ]" //if set check for reconnect
    "seat": 0-9 // seat number
  }
}

{
  "type": "create"
  // no content for now, password, max players, version, etc
}

Create Response:

{
  "type": "create",
  "content": {
    "code": "R4e2" // room code 
    "isadmin": true
  }
}

{
  "type": "join",
  "content": {
    "code": "R4e2"
    // password, version, etc
  }
}

TODO Send client a response

Broadcasted Response:

{
  "type": "playerJoined",
  "content": {
    "username": "John",
    "isadmin" : false
  }
}

TODO Admin needs to update this player with the lobby preferences

Inputs are made by clients and validated on the admin´s client game. The server adds the client´s id and relays the input to the admin.

Request from client:

{
  "type": "input",
  "content": {
    // any json, 
  }
}

Response from server to admin:

{
  "type": "input",
  "clientid" : 0,
  "content": {
    // any json, 
  }
}

Admins can broadcast a message to all clients. The server verifies if the client has admin privileges in the room and relays the same message to everyone in the room.

For admin authoritative gameplay these should be what changes the state of the game.

{
  "type": "broadcast",
  "content": {
    // any 
  }
}

Admins can send a message to a single player and the server relays it to the client.

{
  "type": "send",
  "playerid" : "id",
  "content": {
     // any 
  }
}

{
  "type": "join",
  "content": {
    "code": "D4R9",
    "username": "John",
    "userid": ""       
  }
}

Code heavily based on https://github.com/joshheinrichs/go-chat-tcp