Add the SyncWorkerManual to run sync manually and notify when done.

lib/decentralised_book_index/sync/sync_workers/sync_worker_manual.ex

@@ -0,0 +1,31 @@
+defmodule DecentralisedBookIndex.SyncWorkerManual do
+  use Oban.Worker,
+    queue: :default,
+    max_attempts: 2,
+    tags: ["sync", "manual"]
+
+  require Logger
+
+  alias DecentralisedBookIndex.SyncTasks.SyncServerTask
+
+  @topic "task:events"
+
+  @impl Oban.Worker
+  def perform(%Oban.Job{args: args} = job) do
+    Logger.info("The manual job (#{job.id}) run SyncServerTask at #{DateTime.utc_now()} with args: #{inspect(args)}")
+
+    result = SyncServerTask.sync_all()
+
+    Phoenix.PubSub.broadcast!(
+      DecentralisedBookIndex.PubSub,
+      @topic,
+      {:manual_sync_completed, result}
+    )
+
+    Logger.info("The manual job (#{job.id}) is done.")
+
+    result
+  end
+
+  def topic, do: @topic
+end

lib/decentralised_book_index_web/live/dbi_server_live/index.ex

@@ -89,6 +89,10 @@ defmodule DecentralisedBookIndexWeb.DbiServerLive.Index do
 
   @impl true
   def mount(_params, _session, socket) do
+    if connected?(socket) do
+      Phoenix.PubSub.subscribe(DecentralisedBookIndex.PubSub, DecentralisedBookIndex.SyncWorkerManual.topic())
+    end
+
     {:ok,
      socket
      |> assign_new(:current_user, fn -> nil end)}
@@ -198,23 +202,25 @@ defmodule DecentralisedBookIndexWeb.DbiServerLive.Index do
 
   @impl true
   def handle_event("sync", _params, socket) do
-    Task.async(fn ->
-      SyncServerTask.sync_all()
-      send(self(), :sync_completed)
-    end)
+    case DecentralisedBookIndex.SyncWorkerManual.new(%{}) |> Oban.insert() do
+      {:ok, _job} ->
+        {:noreply, put_flash(socket, :info, "Task started")}
 
-    socket =
-      socket
-      |> put_flash(:info, "The sync is started")
-
-    {:noreply, socket}
+      {:error, reason} ->
+        {:noreply, put_flash(socket, :error, "Failed to start task: #{inspect(reason)}")}
+    end
   end
 
   @impl true
-  def handle_info({_pid, :sync_completed}, socket) do
+  def handle_info({:manual_sync_completed, result}, socket) do
     socket =
-      socket
-      |> put_flash(:info, "The sync is done")
+      if result == :ok do
+        socket
+        |> put_flash(:info, "Task completed")
+      else
+        socket
+        |> put_flash(:error, "Task failed")
+      end
 
     {:noreply, socket}
   end