Get server id from env

.gitignore

@@ -21,3 +21,6 @@ message_server-*.tar
 
 # Temporary files, for example, from tests.
 /tmp/
+
+# Storage
+/storage/

lib/message_server/application.ex

@@ -1,20 +1,22 @@
 defmodule MessageServer.Application do
-  # See https://hexdocs.pm/elixir/Application.html
-  # for more information on OTP Applications
-  @moduledoc false
-
   use Application
+  require Logger
 
   @impl true
   def start(_type, _args) do
+    server_id = get_server_id()
+
     children = [
-      # Starts a worker by calling: MessageServer.Worker.start_link(arg)
-      # {MessageServer.Worker, arg}
+      {MessageServer.Storage, server_id}
     ]
 
-    # See https://hexdocs.pm/elixir/Supervisor.html
-    # for other strategies and supported options
     opts = [strategy: :one_for_one, name: MessageServer.Supervisor]
     Supervisor.start_link(children, opts)
   end
+
+  @spec get_server_id() :: String.t()
+  def get_server_id() do
+    System.get_env("SERVER_ID") ||
+      raise "SERVER_ID is required"
+  end
 end

storage/server_test_server/test_server-alice.txt

@@ -1,7 +0,0 @@
-test_server-bob: Hello Alice!
-test_server-bob: Hi Alice
-test_server-bob: Hello! 🎉 Special chars: @#$%^&*()
-test_server-bob: Test message
-test_server-bob: First message
-test_server-charlie: Second message
-test_server-bob: Hello Alice!

storage/server_test_server/test_server-charlie.txt

@@ -1 +0,0 @@
-test_server-bob: Hi Charlie