Add the task to sync authors from the API.

lib/decentralised_book_index/sync/sync_tasks/sync_authors_task.ex

@@ -0,0 +1,25 @@
+defmodule DecentralisedBookIndex.SyncTasks.SyncAuthorsTask do
+  alias DecentralisedBookIndex.Sync.ApiClients.FetchJsons
+  alias DecentralisedBookIndex.Sync.DataTransformers.AuthorTransformer
+  alias DecentralisedBookIndex.Sync.AuthorSync
+
+  def sync(endpoint) do
+    url = "#{endpoint}/api/v1/json/author"
+    FetchJsons.get(url, &sync_author_chunk/1)
+    endpoint
+  end
+
+  def sync_author_chunk(json_chunk) do
+    for json <- json_chunk do
+      with {:ok, attrs} <- AuthorTransformer.from_json(json),
+           :ok <- AuthorSync.create_update(attrs) do
+        :ok
+      else
+        {:error, reason} ->
+          Logger.error("Pipeline error: #{inspect(reason)}")
+      end
+    end
+
+    []
+  end
+end