Define a New Module

Channel module

The first thing we need is a Channel module. Let’s get one started at islands_interface/lib/islands_interface_web/channels/game_channel.ex:

defmodule IslandsInterfaceWeb.GameChannel do
  use IslandsInterfaceWeb, :channel

  alias IslandsEngine.{Game, GameSupervisor}

To make it behave like a Channel, we use IslandsInterfaceWeb :channel. This triggers the existing channel/0 function in the IslandsInterfaceWeb module, located at islands_interface/lib/islands_interface_web/islands_interface_web.ex.

def channel do
  quote do
    use Phoenix.Channel
    import IslandsInterfaceWeb.Gettext
  end
end

We later work with the Game and GameSupervisor modules, so we need to alias them here. ...