Improve supervision tree

lib/ex_turn/supervisor.ex

@@ -0,0 +1,29 @@
+defmodule ExTURN.Supervisor do
+  @moduledoc false
+  use Supervisor
+
+  require Logger
+
+  @version Mix.Project.config()[:version]
+
+  @spec start_link(any()) :: Supervisor.on_start()
+  def start_link(_arg) do
+    Supervisor.start_link(__MODULE__, nil, name: __MODULE__)
+  end
+
+  @impl true
+  def init(_arg) do
+    Logger.info("Starting ExTURN v#{@version}")
+
+    listen_ip = Application.fetch_env!(:ex_turn, :listen_ip)
+    listen_port = Application.fetch_env!(:ex_turn, :listen_port)
+
+    children = [
+      {DynamicSupervisor, strategy: :one_for_one, name: ExTURN.AllocationSupervisor},
+      {Registry, keys: :unique, name: Registry.Allocations},
+      {ExTURN.Listener, [listen_ip, listen_port]},
+    ]
+
+    Supervisor.init(children, strategy: :one_for_all)
+  end
+end

lib/ex_turn_app.ex

@@ -2,17 +2,8 @@ defmodule ExTURN.App do
   @moduledoc false
   use Application
 
-  require Logger
-
-  @version Mix.Project.config()[:version]
-
   @impl true
   def start(_, _) do
-    Logger.info("Starting ExTURN v#{@version}...")
-
-    listen_ip = Application.fetch_env!(:ex_turn, :listen_ip)
-    listen_port = Application.fetch_env!(:ex_turn, :listen_port)
-
     auth_provider_ip = Application.fetch_env!(:ex_turn, :auth_provider_ip)
     auth_provider_port = Application.fetch_env!(:ex_turn, :auth_provider_port)
     use_tls? = Application.fetch_env!(:ex_turn, :auth_provider_use_tls?)
@@ -34,11 +25,9 @@ defmodule ExTURN.App do
       end
 
     children = [
+      ExTURN.Supervisor,
       {TelemetryMetricsPrometheus,
        metrics: metrics(), plug_cowboy_opts: [ip: metrics_ip, port: metrics_port]},
-      {DynamicSupervisor, strategy: :one_for_one, name: ExTURN.AllocationSupervisor},
-      {Registry, keys: :unique, name: Registry.Allocations},
-      {ExTURN.Listener, [listen_ip, listen_port]},
       {Bandit,
        [plug: ExTURN.AuthProvider, ip: auth_provider_ip, port: auth_provider_port] ++ scheme_opts}
     ]