Add function for removing game from GameCoordinator

apps/amethyst/lib/apps/game_coordinator.ex

@@ -21,6 +21,7 @@ defmodule Amethyst.GameCoordinator do
   The game coordinator is responsible for keeping track of active
   instances of each game and can create new ones on demand.
   """
+  require Logger
 
   defmodule State do
     @moduledoc """
@@ -73,6 +74,12 @@ defmodule Amethyst.GameCoordinator do
     end
   end
 
+  @impl true
+  def handle_cast({:remove, gid}, state) do
+    {games, state} = _remove(gid, state)
+    {:noreply, state}
+  end
+
   @spec _create(atom(), State.t()) :: {Game.t(), State.t()}
   defp _create(type, state) do
     # Create a DynamicSupervisor for this game
@@ -92,6 +99,7 @@ defmodule Amethyst.GameCoordinator do
       mod: type, refs: refs, opts: [], gid: state.gid
     }
     games = state.games |> Map.put(state.gid, game)
+    Logger.info("Created new game #{inspect(game)}")
     {game, %State{gid: state.gid + 1, games: games}}
   end
 
@@ -102,6 +110,11 @@ defmodule Amethyst.GameCoordinator do
     end
   end
 
+  defp _remove(gid, state) do
+    games = state.games |> Map.delete(gid)
+    {games, %State{state | games: games}}
+  end
+
   def create(type) when is_atom(type) do
     GenServer.call({:global, __MODULE__}, {:create, type})
   end
@@ -111,4 +124,7 @@ defmodule Amethyst.GameCoordinator do
   def find_or_create(type) when is_atom(type) do
     GenServer.call({:global, __MODULE__}, {:find_or_create, type})
   end
+  def remove(gid) when is_integer(gid) do
+    GenServer.cast({:global, __MODULE__}, {:remove, gid})
+  end
 end