config versioningfeature/config-versioning

- added DynamicSupervisor, which starts Pleroma deps and restarts config dependent deps
- added versioning for in database config. New version is created from
changes which are passed to config update/delete endpoint. Every version
contains backup with all changes added through update. Versioning
supports rollbacks with N steps. With a rollback, all versions that
come after the version on which the rollback was made are deleted.

1 files changed, 25 insertions, 0 deletions

diff --git a/lib/pleroma/config/version.ex b/lib/pleroma/config/version.ex
new file mode 100644
index 000000000..2f66cc039
--- /dev/null
+++ b/lib/pleroma/config/version.ex
@@ -0,0 +1,25 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Config.Version do
+  @moduledoc """
+  IMPORTANT!!!
+  Before modifying records in the database directly, please read "Config versioning" in `docs/development/config_versioning.md`.
+  """
+
+  use Ecto.Schema
+
+  import Ecto.Query, only: [from: 2]
+
+  schema "config_versions" do
+    field(:backup, Pleroma.EctoType.Config.BinaryValue)
+    field(:current, :boolean, default: true)
+
+    timestamps()
+  end
+
+  def all do
+    from(v in __MODULE__, order_by: [desc: v.id]) |> Pleroma.Repo.all()
+  end
+end