Online multiplayer board game server written in Go, using WebSockets.

BfH Server

The Battle for Hermannia is a board game created as a gift by the father of hermannm, a developer of this project. This digital edition of Hermannia is an online multiplayer implementation of the game. It consists of this server, written in Go, as well as a Unity client at immerse-ntnu/bfh-client.

Package Structure

  • The game package contains the game logic for The Battle for Hermannia, mainly the resolving of orders.
  • The boards package contains the JSON files for the game's boards, and functions for deserializing them.
  • The lobby package defines endpoints for finding, creating and joining lobbies, and manages WebSocket connections between players and lobbies. It is agnostic to the type of game played.
  • The messages package defines the game-specific types of messages sent between client and server, as well as the logic for sorting incoming messages.
  • The app package contains subpackages for each of the server's executables, and the common setup code for them.
    • The main package under local sets up a game server with a single, server-created lobby.
    • The main package under public sets up a game server where anyone can create their own lobbies through an open endpoint.
Owner
null
https://github.com/hermannm/bfh-server
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Comments
  • refactor: reduce use of pointers in game package

    refactor: reduce use of pointers in game package

    Changes:

    • Eliminate most use of pointers in types from the game package.
      • Refactor dependent functions and other packages accordingly.
    • Implement concurrent resolving of game battles.
    • Restructure some of the files in the game package to make file names clearer.

    Rationale:

    Do not communicate by sharing memory, share memory by communicating.

    — Rob Pike, co-creator of the Go programming language

    The previous implementation of the game package relied heavily on pointers. This became a problem when trying to implement concurrency, as mutation from different goroutines could lead to race conditions. In addition, it was difficult to know where mutations could be made, and nil pointer dereferencing was a common bug.

    One solution may have been to use mutexes, but passing by value and using channels seems like the more idiomatic approach in Go. With this PR, board mutation is kept in one goroutine, which dispatches other goroutines to calculate results. Hopefully, this should reduce bugs and make it easier to implement more concurrency in the future.

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