Add a search backend behaviour

lib/pleroma/search/database_search.ex

@@ -13,6 +13,8 @@ defmodule Pleroma.Search.DatabaseSearch do
 
   import Ecto.Query
 
+  @behaviour Pleroma.Search.SearchBackend
+
   def search(user, search_query, options \\ []) do
     index_type = if Pleroma.Config.get([:database, :rum_enabled]), do: :rum, else: :gin
     limit = Enum.min([Keyword.get(options, :limit), 40])
@@ -45,7 +47,10 @@ def search(user, search_query, options \\ []) do
     end
   end
 
+  @impl true
   def add_to_index(_activity), do: nil
+
+  @impl true
   def remove_from_index(_object), do: nil
 
   def maybe_restrict_author(query, %User{} = author) do

lib/pleroma/search/meilisearch.ex

@@ -7,6 +7,8 @@ defmodule Pleroma.Search.Meilisearch do
   import Pleroma.Search.DatabaseSearch
   import Ecto.Query
 
+  @behaviour Pleroma.Search.SearchBackend
+
   defp meili_headers do
     private_key = Pleroma.Config.get([Pleroma.Search.Meilisearch, :private_key])
 
@@ -139,6 +141,7 @@ def object_to_search_data(object) do
     end
   end
 
+  @impl true
   def add_to_index(activity) do
     maybe_search_data = object_to_search_data(activity.object)
 
@@ -159,6 +162,7 @@ def add_to_index(activity) do
     end
   end
 
+  @impl true
   def remove_from_index(object) do
     meili_delete!("/indexes/objects/documents/#{object.id}")
   end

lib/pleroma/search/search_backend.ex

@@ -0,0 +1,17 @@
+defmodule Pleroma.Search.SearchBackend do
+  @doc """
+  Add the object associated with the activity to the search index.
+
+  The whole activity is passed, to allow filtering on things such as scope.
+  """
+  @callback add_to_index(activity :: Pleroma.Activity.t()) :: nil
+
+  @doc """
+  Remove the object from the index.
+
+  Just the object, as opposed to the whole activity, is passed, since the object
+  is what contains the actual content and there is no need for fitlering when removing
+  from index.
+  """
+  @callback remove_from_index(object :: Pleroma.Object.t()) :: nil
+end