restarting pleroma from outside application

lib/pleroma/config/transfer_task.ex

@@ -10,6 +10,30 @@ defmodule Pleroma.Config.TransferTask do
 
   require Logger
 
+  @type env() :: :test | :benchmark | :dev | :prod
+
+  @reboot_time_keys [
+    {:pleroma, :hackney_pools},
+    {:pleroma, :chat},
+    {:pleroma, Oban},
+    {:pleroma, :rate_limit},
+    {:pleroma, :markup},
+    {:plerome, :streamer}
+  ]
+
+  @reboot_time_subkeys [
+    {:pleroma, Pleroma.Captcha, [:seconds_valid]},
+    {:pleroma, Pleroma.Upload, [:proxy_remote]},
+    {:pleroma, :instance, [:upload_limit]},
+    {:pleroma, :email_notifications, [:digest]},
+    {:pleroma, :oauth2, [:clean_expired_tokens]},
+    {:pleroma, Pleroma.ActivityExpiration, [:enabled]},
+    {:pleroma, Pleroma.ScheduledActivity, [:enabled]},
+    {:pleroma, :gopher, [:enabled]}
+  ]
+
+  @reject [nil, :prometheus]
+
   def start_link(_) do
     load_and_update_env()
     if Pleroma.Config.get(:env) == :test, do: Ecto.Adapters.SQL.Sandbox.checkin(Repo)
@@ -17,21 +41,34 @@ defmodule Pleroma.Config.TransferTask do
   end
 
   @spec load_and_update_env([ConfigDB.t()]) :: :ok | false
-  def load_and_update_env(deleted \\ []) do
+  def load_and_update_env(deleted \\ [], restart_pleroma? \\ true) do
     with true <- Pleroma.Config.get(:configurable_from_database),
          true <- Ecto.Adapters.SQL.table_exists?(Repo, "config"),
          started_applications <- Application.started_applications() do
       # We need to restart applications for loaded settings take effect
+
       in_db = Repo.all(ConfigDB)
 
       with_deleted = in_db ++ deleted
 
-      with_deleted
-      |> Enum.map(&merge_and_update(&1))
-      |> Enum.uniq()
-      # TODO: some problem with prometheus after restart!
-      |> Enum.reject(&(&1 in [:pleroma, nil, :prometheus]))
-      |> Enum.each(&restart(started_applications, &1))
+      reject_for_restart = if restart_pleroma?, do: @reject, else: [:pleroma | @reject]
+
+      applications =
+        with_deleted
+        |> Enum.map(&merge_and_update(&1))
+        |> Enum.uniq()
+        # TODO: some problem with prometheus after restart!
+        |> Enum.reject(&(&1 in reject_for_restart))
+
+      # to be ensured that pleroma will be restarted last
+      applications =
+        if :pleroma in applications do
+          List.delete(applications, :pleroma) ++ [:pleroma]
+        else
+          applications
+        end
+
+      Enum.each(applications, &restart(started_applications, &1, Pleroma.Config.get(:env)))
 
       :ok
     end
@@ -43,12 +80,25 @@ defmodule Pleroma.Config.TransferTask do
       group = ConfigDB.from_string(setting.group)
 
       default = Pleroma.Config.Holder.config(group, key)
-      merged_value = merge_value(setting, default, group, key)
+      value = ConfigDB.from_binary(setting.value)
+
+      merged_value =
+        if Ecto.get_meta(setting, :state) == :deleted do
+          default
+        else
+          if can_be_merged?(default, value) do
+            ConfigDB.merge_group(group, key, default, value)
+          else
+            value
+          end
+        end
 
       :ok = update_env(group, key, merged_value)
 
       if group != :logger do
-        group
+        if group != :pleroma or pleroma_need_restart?(group, key, value) do
+          group
+        end
       else
         # change logger configuration in runtime, without restart
         if Keyword.keyword?(merged_value) and
@@ -76,22 +126,31 @@ defmodule Pleroma.Config.TransferTask do
     end
   end
 
-  defp merge_value(%{__meta__: %{state: :deleted}}, default, _group, _key), do: default
+  @spec pleroma_need_restart?(atom(), atom(), any()) :: boolean()
+  def pleroma_need_restart?(group, key, value) do
+    group_and_key_need_reboot?(group, key) or group_and_subkey_need_reboot?(group, key, value)
+  end
 
-  defp merge_value(setting, default, group, key) do
-    value = ConfigDB.from_binary(setting.value)
+  defp group_and_key_need_reboot?(group, key) do
+    Enum.any?(@reboot_time_keys, fn {g, k} -> g == group and k == key end)
+  end
 
-    if can_be_merged?(default, value) do
-      ConfigDB.merge_group(group, key, default, value)
-    else
-      value
-    end
+  defp group_and_subkey_need_reboot?(group, key, value) do
+    Keyword.keyword?(value) and
+      Enum.any?(@reboot_time_subkeys, fn {g, k, subkeys} ->
+        g == group and k == key and
+          Enum.any?(Keyword.keys(value), &(&1 in subkeys))
+      end)
   end
 
   defp update_env(group, key, nil), do: Application.delete_env(group, key)
   defp update_env(group, key, value), do: Application.put_env(group, key, value)
 
-  defp restart(started_applications, app) do
+  defp restart(_, :pleroma, :test), do: Logger.warn("pleroma restarted")
+
+  defp restart(_, :pleroma, _), do: send(Restarter.Pleroma, :after_boot)
+
+  defp restart(started_applications, app, _) do
     with {^app, _, _} <- List.keyfind(started_applications, app, 0),
          :ok <- Application.stop(app) do
       :ok = Application.start(app)