.gitignore

@@ -37,3 +37,6 @@ npm-debug.log
 
 # Ignore IDE files.
 .elixir_ls/
+
+# Ignore server lists.
+/priv/nts.txt

config/config.exs

@@ -30,6 +30,9 @@ config :chronoscope, ChronoscopeWeb.Endpoint,
 # at the `config/runtime.exs`.
 config :chronoscope, Chronoscope.Mailer, adapter: Swoosh.Adapters.Local
 
+config :chronoscope, :nts_topic, "nts-servers"
+config :chronoscope, :nts_file, "priv/nts.txt"
+
 # Configure esbuild (the version is required)
 config :esbuild,
   version: "0.17.11",

config/test.exs

@@ -10,6 +10,8 @@ config :chronoscope, ChronoscopeWeb.Endpoint,
 # In test we don't send emails.
 config :chronoscope, Chronoscope.Mailer, adapter: Swoosh.Adapters.Test
 
+config :chronoscope, :nts_file, "test/priv/nts.txt"
+
 # Disable swoosh api client as it is only required for production adapters.
 config :swoosh, :api_client, false
 

lib/chronoscope/application.ex

@@ -22,7 +22,8 @@ defmodule Chronoscope.Application do
       {Task.Supervisor, name: Chronoscope.Gemini.TaskSupervisor},
       {Registry, [keys: :unique, name: Chronoscope.Gemini.Registry]},
       # Start to serve requests, typically the last entry
-      ChronoscopeWeb.Endpoint
+      ChronoscopeWeb.Endpoint,
+      Chronoscope.Monitor
     ]
 
     # See https://hexdocs.pm/elixir/Supervisor.html

lib/chronoscope/gemini.ex

@@ -9,6 +9,8 @@ defmodule Chronoscope.Gemini do
 
   alias Chronoscope.Gemini
 
+  @timeout_in_milliseconds 10_000
+
   @registry Application.compile_env(:chronoscope, :registry, Registry)
   @genserver Application.compile_env(:chronoscope, :gen_server, GenServer)
   @dynamic_supervisor Application.compile_env(:chronoscope, :dynamic_supervisor, DynamicSupervisor)
@@ -20,14 +22,14 @@ defmodule Chronoscope.Gemini do
   def list() do
     Gemini.DynamicSupervisor
     |> @dynamic_supervisor.which_children()
-    |> Enum.map(fn {_, pid, _, _} -> @genserver.call(pid, :list) end)
+    |> Enum.map(fn {_, pid, _, _} -> @genserver.call(pid, :list, @timeout_in_milliseconds) end)
   end
 
   def remove(host, port, path) do
     name = client_name(%{host: host, port: port, path: path})
 
     case @registry.lookup(Gemini.Registry, name) do
-      [{pid, _}] -> {:ok, @genserver.call(pid, :terminate)}
+      [{pid, _}] -> {:ok, @genserver.call(pid, :terminate, @timeout_in_milliseconds)}
       [] -> {:error, :not_found}
     end
   end
@@ -36,7 +38,7 @@ defmodule Chronoscope.Gemini do
   def connect(host, port, path) do
     %{host: host, port: port, path: path}
     |> client_pid()
-    |> @genserver.call(:connect)
+    |> @genserver.call(:connect, @timeout_in_milliseconds)
   end
 
   defp client_pid(resource) do

lib/chronoscope/gemini/client.ex

@@ -5,6 +5,7 @@ defmodule Chronoscope.Gemini.Client do
   alias Chronoscope.Gemini.ConnectionClient
 
   @interval_in_seconds 30
+  @timeout_in_milliseconds 10_000
 
   @date_time Application.compile_env(:chronoscope, :date_time, DateTime)
 
@@ -61,7 +62,7 @@ defmodule Chronoscope.Gemini.Client do
   defp server_response(%{resource: resource}) do
     Gemini.TaskSupervisor
     |> Task.Supervisor.async(fn -> ConnectionClient.connect(resource) end)
-    |> Task.await()
+    |> Task.await(@timeout_in_milliseconds)
   end
 
   defp interval_surpassed?(now, last_request) do

lib/chronoscope/monitor.ex

@@ -0,0 +1,40 @@
+defmodule Chronoscope.Monitor do
+  use GenServer
+
+  require Logger
+
+  alias Chronoscope.NTS
+  alias Chronoscope.NTS.Parse
+
+  @nts_file Application.compile_env(:chronoscope, :nts_file)
+
+  def start_link(_) do
+    GenServer.start_link(__MODULE__, :ok, name: __MODULE__)
+  end
+
+  @impl true
+  def init(_) do
+    File.touch(@nts_file)
+    activate_nts_clients()
+    {:ok, %{nts_servers: activate_nts_clients()}}
+  end
+
+  @impl true
+  def handle_info(:activate_clients, _state) do
+    {:noreply, %{nts_servers: activate_nts_clients()}}
+  end
+
+  @impl true
+  def handle_call(:get_nts_servers, _from, state) do
+    {:reply, state.nts_servers, state}
+  end
+
+  defp activate_nts_clients() do
+    @nts_file
+    |> File.stream!()
+    |> Stream.map(&String.trim/1)
+    |> Stream.map(&Parse.parse_nts_server/1)
+    |> Enum.to_list()
+    |> tap(fn server -> Enum.each(server, &NTS.auto_refresh/1) end)
+  end
+end

lib/chronoscope/nts.ex

@@ -9,10 +9,11 @@ defmodule Chronoscope.NTS do
 
   alias Chronoscope.NTS
 
+  @timeout_in_milliseconds 10_000
+
   @registry Application.compile_env(:chronoscope, :registry, Registry)
   @genserver Application.compile_env(:chronoscope, :gen_server, GenServer)
   @dynamic_supervisor Application.compile_env(:chronoscope, :dynamic_supervisor, DynamicSupervisor)
-  @topic "nts-servers"
 
   def healthy?() do
     true
@@ -24,11 +25,29 @@ defmodule Chronoscope.NTS do
     |> Enum.map(fn {_, pid, _, _} -> @genserver.call(pid, :list) end)
   end
 
+  def list_clients(clients) do
+    clients
+    |> Enum.map(&client_pid/1)
+    |> Enum.map(fn pid -> @genserver.call(pid, :list, @timeout_in_milliseconds) end)
+  end
+
+  def auto_refresh(server) do
+    server
+    |> client_pid()
+    |> @genserver.call(:auto_refresh, @timeout_in_milliseconds)
+  end
+
+  def cancel_auto_refresh(server) do
+    server
+    |> client_pid()
+    |> @genserver.call(:cancel_auto_refresh, @timeout_in_milliseconds)
+  end
+
   def remove(host, port) do
     name = client_name(%{host: host, port: port})
 
     case @registry.lookup(NTS.Registry, name) do
-      [{pid, _}] -> {:ok, @genserver.call(pid, :terminate)}
+      [{pid, _}] -> {:ok, @genserver.call(pid, :terminate, @timeout_in_milliseconds)}
       [] -> {:error, :not_found}
     end
   end
@@ -37,8 +56,7 @@ defmodule Chronoscope.NTS do
   def key_establishment(host, port) do
     %{host: host, port: port}
     |> client_pid()
-    |> @genserver.call(:key_establishment)
+    |> @genserver.call(:key_establishment, @timeout_in_milliseconds)
-    |> tap(fn _ -> ChronoscopeWeb.Endpoint.broadcast(@topic, "", "") end)
   end
 
   defp client_pid(server) do

lib/chronoscope/nts/client.ex

@@ -5,7 +5,10 @@ defmodule Chronoscope.NTS.Client do
   alias Chronoscope.NTS.KeyEstablishmentClient
 
   @interval_in_seconds 30
+  @timeout_in_milliseconds 10_000
+  @refresh_interval_in_milliseconds :timer.minutes(1)
 
+  @topic Application.compile_env(:chronoscope, :nts_topic)
   @date_time Application.compile_env(:chronoscope, :date_time, DateTime)
 
   def start_link(server: server, name: name) do
@@ -34,6 +37,28 @@ defmodule Chronoscope.NTS.Client do
     {:reply, state, state}
   end
 
+  @impl true
+  def handle_call(:auto_refresh, _from, %{timer: _timer} = state) do
+    {:reply, :already_started, state}
+  end
+
+  @impl true
+  def handle_call(:auto_refresh, _from, state) do
+    {:ok, timer} = :timer.send_interval(@refresh_interval_in_milliseconds, :key_establishment)
+    {:reply, :ok, Map.put(state, :timer, timer)}
+  end
+
+  @impl true
+  def handle_call(:cancel_auto_refresh, _from, %{timer: timer} = state) do
+    :timer.cancel(timer)
+    {:reply, :ok, Map.delete(state, :timer)}
+  end
+
+  @impl true
+  def handle_call(:cancel_auto_refresh, _from, state) do
+    {:reply, :already_cancelled, state}
+  end
+
   @impl true
   def handle_call(:key_establishment, _from, state) do
     new_state = update_state(state)
@@ -41,11 +66,18 @@ defmodule Chronoscope.NTS.Client do
     {:reply, new_state.key_establishment_response, new_state}
   end
 
+  @impl true
+  def handle_info(:key_establishment, state) do
+    {:noreply, update_state(state)}
+  end
+
   defp update_state(state) do
     now = utc_now()
 
     if interval_surpassed?(now, state.last_key_establishment) do
-      Map.merge(state, current_data(state, now))
+      state
+      |> Map.merge(current_data(state, now))
+      |> tap(fn _ -> ChronoscopeWeb.Endpoint.broadcast(@topic, "", "") end)
     else
       state
     end
@@ -61,7 +93,7 @@ defmodule Chronoscope.NTS.Client do
   defp server_response(%{server: server}) do
     NTS.TaskSupervisor
     |> Task.Supervisor.async(fn -> KeyEstablishmentClient.key_establishment(server) end)
-    |> Task.await()
+    |> Task.await(@timeout_in_milliseconds)
   end
 
   defp interval_surpassed?(now, last_key_establishment) do

lib/chronoscope/nts/key_establishment_client.ex

@@ -5,7 +5,7 @@ defmodule Chronoscope.NTS.KeyEstablishmentClient do
   alias Chronoscope.NTS.KeyEstablishmentRequest
   alias Chronoscope.NTS.KeyEstablishmentResponse
 
-  @timeout_in_milliseconds 3000
+  @timeout_in_milliseconds 3500
 
   @ssl Application.compile_env(:chronoscope, :ssl, :ssl)
 

lib/chronoscope/nts/parse.ex

@@ -0,0 +1,10 @@
+defmodule Chronoscope.NTS.Parse do
+  @default_port 4460
+
+  def parse_nts_server(server) do
+    case String.split(server, ":") do
+      [host, port] -> %{host: host, port: String.to_integer(port)}
+      [host] -> %{host: host, port: @default_port}
+    end
+  end
+end

lib/chronoscope_web/components/layouts/app.html.heex

@@ -1,4 +1,4 @@
-<header class="px-4 sm:px-6 lg:px-8">
+<header class="px-4 sm:px-6 lg:px-8 sticky top-0 z-10 bg-white dark:bg-zinc-800">
   <div class="flex items-center justify-between border-b border-zinc-100 dark:border-zinc-700 py-3 text-sm">
     <div class="flex items-center gap-4 font-semibold leading-6 text-zinc-900 dark:text-zinc-300 pe-4">
       <a href="/" class="hover:text-zinc-700 dark:hover:text-zinc-400">

lib/chronoscope_web/live/index_live.ex

@@ -4,14 +4,20 @@ defmodule ChronoscopeWeb.IndexLive do
   alias Chronoscope.NTS
   alias Chronoscope.NTS.KeyEstablishmentResponse
 
-  @topic "nts-servers"
+  @topic Application.compile_env(:chronoscope, :nts_topic)
 
   def mount(_params, _session, socket) do
     ChronoscopeWeb.Endpoint.subscribe(@topic)
-    {:ok, assign(socket, %{servers: NTS.list()})}
+    {:ok, assign(socket, %{servers: server_list()})}
   end
 
   def handle_info(%{topic: @topic}, socket) do
-    {:noreply, assign(socket, %{servers: NTS.list()})}
+    {:noreply, assign(socket, %{servers: server_list()})}
+  end
+
+  defp server_list() do
+    Chronoscope.Monitor
+    |> GenServer.call(:get_nts_servers)
+    |> NTS.list_clients()
   end
 end

lib/chronoscope_web/live/index_live.html.heex

@@ -2,31 +2,31 @@
     <table class="mx-auto border-collapse table-auto min-w-full divide-y divide-zinc-200 dark:divide-zinc-700 text-left">
         <thead>
             <tr>
-                <th scope="col" class="py-3 px-6 whitespace-nowrap">
+                <th scope="col" class="py-2 px-6 whitespace-nowrap">
                     NTS-KE Server
                 </th>
-                <th scope="col" class="py-3 px-6 whitespace-nowrap">
+                <th scope="col" class="py-2 px-6 whitespace-nowrap">
                     Status
                 </th>
-                <th scope="col" class="py-3 px-6 whitespace-nowrap">
+                <th scope="col" class="py-2 px-6 whitespace-nowrap">
                     Algorithm
                 </th>
-                <th scope="col" class="py-3 px-6 whitespace-nowrap">
+                <th scope="col" class="py-2 px-6 whitespace-nowrap">
                     Cookies
                 </th>
-                <th scope="col" class="py-3 px-6 whitespace-nowrap">
+                <th scope="col" class="py-2 px-6 whitespace-nowrap">
                     Cookie Length
                 </th>
-                <th scope="col" class="py-3 px-6 whitespace-nowrap">
+                <th scope="col" class="py-2 px-6 whitespace-nowrap">
                     NTP Host
                 </th>
-                <th scope="col" class="py-3 px-6 whitespace-nowrap">
+                <th scope="col" class="py-2 px-6 whitespace-nowrap">
                     NTP Port
                 </th>
-                <th scope="col" class="py-3 px-6 whitespace-nowrap">
+                <th scope="col" class="py-2 px-6 whitespace-nowrap">
                     Certificate Expiration
                 </th>
-                <th scope="col" class="py-3 px-6 whitespace-nowrap">
+                <th scope="col" class="py-2 px-6 whitespace-nowrap">
                     Last Check
                 </th>
             </tr>
@@ -36,13 +36,13 @@
                 <% {status, response} = server.key_establishment_response %>
 
                 <%= if (status == :ok) do %>
-                <td class="py-4 px-6 whitespace-nowrap">
+                <td class="py-2 px-6 whitespace-nowrap">
-                    <%= server.server.host %>:<%= server.server.port %>
+                    <%= server.server.host %><span :if={server.server.port != 4460}>:<%= server.server.port %></span>
                 </td>
-                <td class="py-4 px-6 whitespace-nowrap">
+                <td class="py-2 px-6 whitespace-nowrap">
                     <%= status %>
                 </td>
-                <td class="py-4 px-6 whitespace-nowrap">
+                <td class="py-2 px-6 whitespace-nowrap">
                     <% aead_algorithm =  Enum.at(response.aead_algorithms, 0) %>
 
                     <span class="group relative">
@@ -52,30 +52,30 @@
                         </span>
                     </span>
                 </td>
-                <td class="py-4 px-6 whitespace-nowrap">
+                <td class="py-2 px-6 whitespace-nowrap">
                     <%= length(response.cookies) %>
                 </td>
-                <td class="py-4 px-6 whitespace-nowrap">
+                <td class="py-2 px-6 whitespace-nowrap">
                     <%= response.cookie_length %>
                 </td>
-                <td class="py-4 px-6 whitespace-nowrap">
+                <td class="py-2 px-6 whitespace-nowrap">
                     <%= Map.get(response, :server, "-") %>
                 </td>
-                <td class="py-4 px-6 whitespace-nowrap">
+                <td class="py-2 px-6 whitespace-nowrap">
                     <%= Map.get(response, :port, "-") %>
                 </td>
-                <td class="py-4 px-6 whitespace-nowrap">
+                <td class="py-2 px-6 whitespace-nowrap">
                     <%= response.cert_expiration |> DateTime.from_iso8601 |> then(fn {:ok, dt, _} -> Calendar.strftime(dt, "%Y-%m-%d %H:%M:%SZ") end)%>
                 </td>
-                <td class="py-4 px-6 whitespace-nowrap">
+                <td class="py-2 px-6 whitespace-nowrap">
                     <%= server.last_key_establishment  |> Calendar.strftime("%Y-%m-%d %H:%M:%SZ") %>
                 </td>
 
                 <% else %>
-                <td class="py-4 px-6 whitespace-nowrap">
+                <td class="py-2 px-6 whitespace-nowrap">
-                    <%= server.server.host %>:<%= server.server.port %>
+                    <%= server.server.host %><span :if={server.server.port != 4460}>:<%= server.server.port %></span>
                 </td>
-                <td class="py-4 px-6 whitespace-nowrap">
+                <td class="py-2 px-6 whitespace-nowrap">
                     <span class="group relative">
                         <%= status %>
                         <span class="pointer-events-none absolute -top-9 left-0 w-max p-1 rounded-lg bg-zinc-300 dark:bg-zinc-600 opacity-0 transition-opacity group-hover:opacity-100">
@@ -83,13 +83,13 @@
                         </span>
                     </span>
                 </td>
-                <td class="py-4 px-6 whitespace-nowrap"> - </td>
+                <td class="py-2 px-6 whitespace-nowrap"> - </td>
-                <td class="py-4 px-6 whitespace-nowrap"> - </td>
+                <td class="py-2 px-6 whitespace-nowrap"> - </td>
-                <td class="py-4 px-6 whitespace-nowrap"> - </td>
+                <td class="py-2 px-6 whitespace-nowrap"> - </td>
-                <td class="py-4 px-6 whitespace-nowrap"> - </td>
+                <td class="py-2 px-6 whitespace-nowrap"> - </td>
-                <td class="py-4 px-6 whitespace-nowrap"> - </td>
+                <td class="py-2 px-6 whitespace-nowrap"> - </td>
-                <td class="py-4 px-6 whitespace-nowrap"> - </td>
+                <td class="py-2 px-6 whitespace-nowrap"> - </td>
-                <td class="py-4 px-6 whitespace-nowrap">
+                <td class="py-2 px-6 whitespace-nowrap">
                     <%=
                     server.last_key_establishment |> Calendar.strftime("%Y-%m-%d %H:%M:%SZ")
                     %>

mix.exs

@@ -4,7 +4,7 @@ defmodule Chronoscope.MixProject do
   def project do
     [
       app: :chronoscope,
-      version: "0.1.0",
+      version: "1.0.0",
       elixir: "~> 1.16",
       elixirc_paths: elixirc_paths(Mix.env()),
       start_permanent: Mix.env() == :prod,

test/chronoscope/nts/parse_test.exs

@@ -0,0 +1,15 @@
+defmodule Chronoscope.NTS.ParseTest do
+  use Chronoscope.Case, async: true
+
+  import Chronoscope.NTS.Parse
+
+  describe "Chronoscope.NTS.Parse.parse_nts_server()" do
+    test "parses a server with a port" do
+      assert parse_nts_server("test.example.com:1234") == %{host: "test.example.com", port: 1234}
+    end
+
+    test "parses a server without a port" do
+      assert parse_nts_server("test.example.com") == %{host: "test.example.com", port: 4460}
+    end
+  end
+end

test/chronoscope/nts_test.exs

@@ -36,6 +36,37 @@ defmodule Chronoscope.NTSTest do
     end
   end
 
+  describe "Chronoscope.NTS.list_clients()" do
+    test "shows empty client list" do
+      assert NTS.list_clients([]) == []
+    end
+
+    test "lists the given clients and starts them if they don't exist" do
+      RegistryMock
+      |> expect(:lookup, fn _, "test:1" -> [{1, nil}] end)
+      |> expect(:lookup, fn _, "test2:2" -> [] end)
+
+      DynamicSupervisorMock
+      |> expect(
+        :start_child,
+        fn Chronoscope.NTS.DynamicSupervisor,
+           {Chronoscope.NTS.Client,
+            [
+              server: %{host: "test2", port: 2},
+              name: {:via, RegistryMock, {Chronoscope.NTS.Registry, "test2:2"}}
+            ]} ->
+          {:ok, 2}
+        end
+      )
+
+      GenServerMock
+      |> expect(:call, fn 1, :list -> :one end)
+      |> expect(:call, fn 2, :list -> :two end)
+
+      assert NTS.list_clients([%{host: "test", port: 1}, %{host: "test2", port: 2}]) == [:one, :two]
+    end
+  end
+
   describe "Chronoscope.NTS.remove()" do
     test "does nothing if the client doesn't exist" do
       RegistryMock
@@ -74,7 +105,7 @@ defmodule Chronoscope.NTSTest do
       )
 
       GenServerMock
-      |> expect(:call, fn 1, :key_establishment -> :result end)
+      |> expect(:call, fn 1, :key_establishment, 10_000 -> :result end)
 
       assert NTS.key_establishment("localhost", 1111) == :result
     end
@@ -84,7 +115,7 @@ defmodule Chronoscope.NTSTest do
       |> expect(:lookup, fn _, _ -> [{1, 2}] end)
 
       GenServerMock
-      |> expect(:call, fn 1, :key_establishment -> :result end)
+      |> expect(:call, fn 1, :key_establishment, 10_000 -> :result end)
 
       assert NTS.key_establishment("localhost", 1111) == :result
     end

test/chronoscope_web/controllers/page_controller_test.exs

@@ -1,16 +1,11 @@
 defmodule ChronoscopeWeb.PageControllerTest do
   use ChronoscopeWeb.ConnCase, async: true
 
-  alias Chronoscope.DynamicSupervisorMock
-
   import Mox
 
   setup :verify_on_exit!
 
   test "GET /", %{conn: conn} do
-    DynamicSupervisorMock
-    |> expect(:which_children, fn _ -> [] end)
-
     conn = get(conn, ~p"/")
     assert html_response(conn, 200) =~ "Chronoscope"
   end

test/support/behaviours.ex

@@ -19,5 +19,6 @@ defmodule Chronoscope.DynamicSupervisor.Behaviour do
 end
 
 defmodule Chronoscope.GenServer.Behaviour do
+  @callback call(pid(), any(), any()) :: any()
   @callback call(pid(), any()) :: any()
 end