Make game collaborative

Author: knewter

README.md

@@ -1,8 +1,15 @@
 # Tetris
 
-To start your new Phoenix application:
+To start tetris:
 
 1. Install dependencies with `mix deps.get`
-2. Start Phoenix endpoint with `mix phoenix.server`
+2. Start Phoenix endpoint with `mix phoenix.server` or interactively with `iex
+   -S mix phoenix.server`
 
 Now you can visit `localhost:4000` from your browser.
+
+To start a new game, from iex:
+
+```elixir
+Tetris.restart_game
+```

lib/tetris.ex

@@ -18,6 +18,7 @@ defmodule Tetris do
     # See http://elixir-lang.org/docs/stable/elixir/Supervisor.html
     # for other strategies and supported options
     opts = [strategy: :one_for_one, name: Tetris.Supervisor]
+    start_game
     Supervisor.start_link(children, opts)
   end
 
@@ -27,4 +28,14 @@ defmodule Tetris do
     Tetris.Endpoint.config_change(changed, removed)
     :ok
   end
+
+  def restart_game do
+    Process.unregister(:game)
+    start_game
+  end
+
+  def start_game do
+    {:ok, game} = Tetris.Game.start
+    Process.register(game, :game)
+  end
 end

web/channels/game.ex

@@ -8,14 +8,12 @@ defmodule Tetris.GameChannel do
 
   def handle_in("event", %{"event" => event_name}, socket) do
     # NOTE: Don't use String.to_atom like this folks
-    Tetris.Game.handle_input(socket.assigns[:game], String.to_atom(event_name))
+    Tetris.Game.handle_input(:game, String.to_atom(event_name))
     {:noreply, socket}
   end
 
   def handle_info(:after_join, socket) do
-    {:ok, game} = Tetris.Game.start
-    spawn(fn() -> Tetris.Websocket.run(game, socket) end)
-    socket = assign(socket, :game, game)
+    spawn(fn() -> Tetris.Websocket.run(:game, socket) end)
     {:noreply, socket}
   end
 end