Begin implementing logging player into a game

apps/amethyst/lib/api/game.ex

@@ -1,9 +1,26 @@
+# Amethyst - An experimental Minecraft server written in Elixir.
+# Copyright (C) 2024 KodiCraft
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as
+# published by the Free Software Foundation, either version 3 of the
+# License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
 defmodule Amethyst.API.Game do
   @moduledoc """
   This module includes the interface for defining and registering
   a game with Amethyst.
   """
   @callback instantiate() :: {:ok, new_state :: term} | {:error, reason :: term}
+  @callback login(connection_process :: pid(), player_cfg :: keyword(), state :: term) :: {:ok, new_state :: term} | {:refuse, new_state :: term}
 
   defmacro __using__(opts) do
     meta = Keyword.get(opts, :meta, [])
@@ -23,8 +40,26 @@ defmodule Amethyst.API.Game do
           loop(state)
         end
         defp loop(state) do
+          receive do
+            {:login, caller, cfg} ->
+              case login(caller, cfg, state) do
+                {:ok, state} ->
+                  send(caller, :ok)
+                  loop(state)
+                {:refuse, state} ->
+                  send(caller, :refuse)
                   loop(state)
               end
           end
         end
+    end
+  end
+
+  def login(pid, cfg) do
+    send(pid, {:login, self(), cfg})
+    receive do
+      :ok -> :ok
+      :refuse -> :refuse
+    end
+  end
 end

apps/amethyst/lib/apps/game_coordinator.ex

@@ -1,3 +1,19 @@
+# Amethyst - An experimental Minecraft server written in Elixir.
+# Copyright (C) 2024 KodiCraft
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as
+# published by the Free Software Foundation, either version 3 of the
+# License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
 defmodule Amethyst.GameCoordinator do
   use GenServer
 
@@ -55,13 +71,13 @@ defmodule Amethyst.GameCoordinator do
     end
   end
 
-  def create(type) do
+  def create(type) when is_atom(type) do
     GenServer.call({:global, __MODULE__}, {:create, type})
   end
-  def find(type) do
+  def find(type) when is_atom(type) do
     GenServer.call({:global, __MODULE__}, {:find, type})
   end
-  def find_or_create(type) do
+  def find_or_create(type) when is_atom(type) do
     GenServer.call({:global, __MODULE__}, {:find_or_create, type})
   end
 end

apps/amethyst/lib/apps/game_registry.ex

@@ -1,3 +1,19 @@
+# Amethyst - An experimental Minecraft server written in Elixir.
+# Copyright (C) 2024 KodiCraft
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as
+# published by the Free Software Foundation, either version 3 of the
+# License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
 defmodule Amethyst.GameRegistry do
   use GenServer
 

apps/amethyst/lib/servers/configuration.ex

@@ -327,16 +327,14 @@ defmodule Amethyst.Server.Configuration do
   end
   # Acknowledge Finish Configuration https://wiki.vg/Protocol#Acknowledge_Finish_Configuration
   def handle({:acknowledge_finish_configuration}, client, state) do
+    game = Amethyst.GameRegistry.get_default() |> elem(0) |> Amethyst.GameCoordinator.find_or_create()
+    state = Keyword.put(state, :game, game)
+    Amethyst.API.Game.login(game, state)
     # TODO: All of this stuff should obviously not be hardcoded here
     Amethyst.Server.Play.transmit({:login,
       0, false, ["minecraft:overworld"], 0, 16, 16, false, true, true, 0,
       "minecraft:overworld", <<0::64>>, :spectator, nil, false, true, nil, 0, false
     }, client)
-    game = Amethyst.GameRegistry.get_default()
-    if game == nil do
-      raise RuntimeError, "No game is set as a default! A single game must be defined as default for players to be able to join."
-    end
-    state = Keyword.put(state, :game, game)
     Amethyst.Server.Play.serve(client, state)
   end
   # Serverbound Plugin Message https://wiki.vg/Protocol#Serverbound_Plugin_Message_(configuration)

apps/example_game/lib/example/game.ex

@@ -1,8 +1,15 @@
 defmodule Example.Game do
+  require Logger
   use Amethyst.API.Game, meta: [default: true]
 
   @impl true
   def instantiate() do
     {:ok, [:hello]}
   end
+
+  @impl true
+  def login(from, cfg, state) do
+    Logger.debug("Player logged in from #{inspect(from)}: #{inspect(cfg)}")
+    {:ok, state}
+  end
 end

config/config.exs

@@ -8,11 +8,7 @@
 # configurations or dependencies per app, it is best to
 # move said applications out of the umbrella.
 import Config
-
-# Sample configuration:
-#
-#     config :logger, :console,
-#       level: :info,
-#       format: "$date $time [$level] $metadata$message\n",
-#       metadata: [:user_id]
-#
+  config :logger, :console,
+    level: :debug,
+    format: "$date $time [$level] $metadata$message",
+    metadata: []