Async barcode scan batch import for 2+ new records

When barcode scan results contain at least 2 new records,
enqueue individual Oban jobs instead of importing synchronously.
Wishlisted/collected/not_found results still process synchronously.

lib/music_library/barcode_scan.ex

@@ -5,6 +5,7 @@ defmodule MusicLibrary.BarcodeScan do
 
   alias MusicLibrary.BarcodeScan.Result
   alias MusicLibrary.Records
+  alias MusicLibrary.Worker.ImportFromMusicbrainzRelease
 
   @spec scan(String.t()) :: {:ok, Result.t()} | {:error, term()}
   def scan(number) do
@@ -31,6 +32,32 @@ defmodule MusicLibrary.BarcodeScan do
     end
   end
 
+  @spec should_import_async?([Result.t()]) :: boolean()
+  def should_import_async?(scan_results) do
+    Enum.count(scan_results, &(&1.status == :new)) >= 2
+  end
+
+  @spec import_results_async([Result.t()], DateTime.t()) ::
+          {:ok, sync_errors :: [{String.t(), term()}], async_count :: non_neg_integer()}
+  def import_results_async(scan_results, current_time) do
+    {new_results, other_results} = Enum.split_with(scan_results, &(&1.status == :new))
+
+    sync_errors = import_results(other_results, current_time)
+
+    Enum.each(new_results, fn scan_result ->
+      %{
+        "release_id" => scan_result.release.id,
+        "format" => MusicBrainz.ReleaseSearchResult.format(scan_result.release),
+        "purchased_at" => DateTime.to_iso8601(current_time),
+        "selected_release_id" => scan_result.release.id
+      }
+      |> ImportFromMusicbrainzRelease.new()
+      |> Oban.insert!()
+    end)
+
+    {:ok, sync_errors, length(new_results)}
+  end
+
   @spec import_results([Result.t()], DateTime.t()) :: [{String.t(), term()}]
   def import_results(scan_results, current_time) do
     Enum.reduce(scan_results, [], fn scan_result, errors ->

lib/music_library/worker/import_from_musicbrainz_release.ex

@@ -0,0 +1,30 @@
+defmodule MusicLibrary.Worker.ImportFromMusicbrainzRelease do
+  @moduledoc """
+  Imports a record from a MusicBrainz release in the background.
+
+  Used by barcode scan batch imports when there are multiple new records to import.
+  """
+
+  use Oban.Worker, queue: :music_brainz, max_attempts: 3
+
+  @impl Oban.Worker
+  def perform(%Oban.Job{args: %{"release_id" => release_id} = args}) do
+    opts = [
+      format: args["format"],
+      purchased_at: parse_datetime(args["purchased_at"]),
+      selected_release_id: args["selected_release_id"]
+    ]
+
+    case MusicLibrary.Records.import_from_musicbrainz_release(release_id, opts) do
+      {:ok, _record} -> :ok
+      {:error, reason} -> {:error, reason}
+    end
+  end
+
+  defp parse_datetime(nil), do: nil
+
+  defp parse_datetime(str) do
+    {:ok, datetime, _offset} = DateTime.from_iso8601(str)
+    datetime
+  end
+end

lib/music_library_web/components/barcode_scanner.ex

@@ -402,13 +402,45 @@ defmodule MusicLibraryWeb.Components.BarcodeScanner do
 
   def handle_event("import_releases", _params, socket) do
     current_time = DateTime.utc_now()
+    scan_results = socket.assigns.scan_results
 
     socket =
-      case BarcodeScan.import_results(socket.assigns.scan_results, current_time) do
+      if BarcodeScan.should_import_async?(scan_results) do
+        {:ok, sync_errors, async_count} =
+          BarcodeScan.import_results_async(scan_results, current_time)
+
+        socket
+        |> maybe_toast_errors(sync_errors)
+        |> put_toast(
+          :info,
+          ngettext(
+            "Importing %{count} record in the background...",
+            "Importing %{count} records in the background...",
+            async_count,
+            count: async_count
+          )
+        )
+      else
+        case BarcodeScan.import_results(scan_results, current_time) do
           [] ->
             put_toast(socket, :info, gettext("Records imported successfully"))
 
           errors ->
+            maybe_toast_errors(socket, errors)
+        end
+      end
+
+    qs = %{order: :purchase}
+
+    {:noreply,
+     socket
+     |> assign(:scan_results, [])
+     |> push_patch(to: ~p"/collection?#{qs}")}
+  end
+
+  defp maybe_toast_errors(socket, []), do: socket
+
+  defp maybe_toast_errors(socket, errors) do
     errors_summary =
       Enum.map_join(errors, "\n", fn {number, reason} ->
         "#{number}: #{ErrorMessages.friendly_message(reason)}"
@@ -421,14 +453,6 @@ defmodule MusicLibraryWeb.Components.BarcodeScanner do
     )
   end
 
-    qs = %{order: :purchase}
-
-    {:noreply,
-     socket
-     |> assign(:scan_results, [])
-     |> push_patch(to: ~p"/collection?#{qs}")}
-  end
-
   defp release_format_label(release) do
     release
     |> MusicBrainz.ReleaseSearchResult.format()

priv/gettext/default.pot

@@ -2395,3 +2395,10 @@ msgstr ""
 #, elixir-autogen, elixir-format
 msgid "Record has a selected release"
 msgstr ""
+
+#: lib/music_library_web/components/barcode_scanner.ex
+#, elixir-autogen, elixir-format
+msgid "Importing %{count} record in the background..."
+msgid_plural "Importing %{count} records in the background..."
+msgstr[0] ""
+msgstr[1] ""

priv/gettext/en/LC_MESSAGES/default.po

@@ -2395,3 +2395,10 @@ msgstr ""
 #, elixir-autogen, elixir-format
 msgid "Record has a selected release"
 msgstr ""
+
+#: lib/music_library_web/components/barcode_scanner.ex
+#, elixir-autogen, elixir-format
+msgid "Importing %{count} record in the background..."
+msgid_plural "Importing %{count} records in the background..."
+msgstr[0] ""
+msgstr[1] ""

test/music_library/barcode_scan_test.exs

@@ -254,4 +254,218 @@ defmodule MusicLibrary.BarcodeScanTest do
       assert {"2222222222", :not_found} in errors
     end
   end
+
+  describe "should_import_async?/1" do
+    test "returns false with zero new results" do
+      refute BarcodeScan.should_import_async?([])
+    end
+
+    test "returns false with one new result" do
+      results = [Result.new("111", %{})]
+      refute BarcodeScan.should_import_async?(results)
+    end
+
+    test "returns true with two new results" do
+      results = [Result.new("111", %{}), Result.new("222", %{})]
+      assert BarcodeScan.should_import_async?(results)
+    end
+
+    test "only counts :new results" do
+      results = [
+        Result.new("111", %{}),
+        Result.wishlisted("222", "some-id", %{}),
+        Result.collected("333", "some-id", %{}),
+        Result.not_found("444")
+      ]
+
+      refute BarcodeScan.should_import_async?(results)
+    end
+
+    test "returns true with mixed statuses including two new" do
+      results = [
+        Result.new("111", %{}),
+        Result.wishlisted("222", "some-id", %{}),
+        Result.new("333", %{})
+      ]
+
+      assert BarcodeScan.should_import_async?(results)
+    end
+  end
+
+  describe "import_results_async/2" do
+    test "enqueues new results as Oban jobs" do
+      current_time = DateTime.utc_now()
+
+      new_result_1 = %Result{
+        status: :new,
+        number: "111",
+        release: %MusicBrainz.ReleaseSearchResult{
+          id: "release-1",
+          title: "Album 1",
+          release_group: %{id: "rg-1", type: :album, title: "Album 1"},
+          artists: "Artist 1",
+          date: "2024",
+          barcode: "111",
+          media: [%{format: "CD", disc_count: 1, track_count: 10}]
+        }
+      }
+
+      new_result_2 = %Result{
+        status: :new,
+        number: "222",
+        release: %MusicBrainz.ReleaseSearchResult{
+          id: "release-2",
+          title: "Album 2",
+          release_group: %{id: "rg-2", type: :album, title: "Album 2"},
+          artists: "Artist 2",
+          date: "2024",
+          barcode: "222",
+          media: [%{format: "12\" Vinyl", disc_count: 1, track_count: 8}]
+        }
+      }
+
+      assert {:ok, [], 2} =
+               BarcodeScan.import_results_async([new_result_1, new_result_2], current_time)
+
+      assert_enqueued(
+        worker: MusicLibrary.Worker.ImportFromMusicbrainzRelease,
+        args: %{
+          "release_id" => "release-1",
+          "format" => "cd",
+          "purchased_at" => DateTime.to_iso8601(current_time),
+          "selected_release_id" => "release-1"
+        }
+      )
+
+      assert_enqueued(
+        worker: MusicLibrary.Worker.ImportFromMusicbrainzRelease,
+        args: %{
+          "release_id" => "release-2",
+          "format" => "vinyl",
+          "purchased_at" => DateTime.to_iso8601(current_time),
+          "selected_release_id" => "release-2"
+        }
+      )
+    end
+
+    test "processes wishlisted results synchronously" do
+      current_time = DateTime.utc_now()
+      wishlisted_record = record(%{purchased_at: nil})
+
+      wishlisted_result = %Result{
+        status: :wishlisted,
+        number: "333",
+        record_id: wishlisted_record.id,
+        release: %MusicBrainz.ReleaseSearchResult{
+          id: "some-release-id",
+          title: "Test",
+          release_group: nil,
+          artists: "Test Artist",
+          date: "2021",
+          barcode: "333",
+          media: [%{format: "CD", disc_count: 1, track_count: 10}]
+        }
+      }
+
+      new_result_1 = %Result{
+        status: :new,
+        number: "111",
+        release: %MusicBrainz.ReleaseSearchResult{
+          id: "release-1",
+          title: "Album 1",
+          release_group: %{id: "rg-1", type: :album, title: "Album 1"},
+          artists: "Artist 1",
+          date: "2024",
+          barcode: "111",
+          media: [%{format: "CD", disc_count: 1, track_count: 10}]
+        }
+      }
+
+      new_result_2 = %Result{
+        status: :new,
+        number: "222",
+        release: %MusicBrainz.ReleaseSearchResult{
+          id: "release-2",
+          title: "Album 2",
+          release_group: %{id: "rg-2", type: :album, title: "Album 2"},
+          artists: "Artist 2",
+          date: "2024",
+          barcode: "222",
+          media: [%{format: "CD", disc_count: 1, track_count: 10}]
+        }
+      }
+
+      assert {:ok, [], 2} =
+               BarcodeScan.import_results_async(
+                 [wishlisted_result, new_result_1, new_result_2],
+                 current_time
+               )
+
+      updated_record = Records.get_record!(wishlisted_record.id)
+      assert updated_record.purchased_at == DateTime.truncate(current_time, :second)
+
+      assert_enqueued(
+        worker: MusicLibrary.Worker.ImportFromMusicbrainzRelease,
+        args: %{"release_id" => "release-1"}
+      )
+
+      assert_enqueued(
+        worker: MusicLibrary.Worker.ImportFromMusicbrainzRelease,
+        args: %{"release_id" => "release-2"}
+      )
+    end
+
+    test "returns sync errors from non-new results" do
+      current_time = DateTime.utc_now()
+
+      collected_result = %Result{
+        status: :collected,
+        number: "333",
+        record_id: "some-id",
+        release: %MusicBrainz.ReleaseSearchResult{
+          id: "r1",
+          title: "T",
+          release_group: nil,
+          artists: "A",
+          date: "2021",
+          barcode: "333",
+          media: [%{format: "CD", disc_count: 1, track_count: 1}]
+        }
+      }
+
+      new_result_1 = %Result{
+        status: :new,
+        number: "111",
+        release: %MusicBrainz.ReleaseSearchResult{
+          id: "release-1",
+          title: "Album 1",
+          release_group: %{id: "rg-1", type: :album, title: "Album 1"},
+          artists: "Artist 1",
+          date: "2024",
+          barcode: "111",
+          media: [%{format: "CD", disc_count: 1, track_count: 10}]
+        }
+      }
+
+      new_result_2 = %Result{
+        status: :new,
+        number: "222",
+        release: %MusicBrainz.ReleaseSearchResult{
+          id: "release-2",
+          title: "Album 2",
+          release_group: %{id: "rg-2", type: :album, title: "Album 2"},
+          artists: "Artist 2",
+          date: "2024",
+          barcode: "222",
+          media: [%{format: "CD", disc_count: 1, track_count: 10}]
+        }
+      }
+
+      assert {:ok, [{"333", :already_collected}], 2} =
+               BarcodeScan.import_results_async(
+                 [collected_result, new_result_1, new_result_2],
+                 current_time
+               )
+    end
+  end
 end

test/music_library/worker/import_from_musicbrainz_release_test.exs

@@ -0,0 +1,67 @@
+defmodule MusicLibrary.Worker.ImportFromMusicbrainzReleaseTest do
+  use MusicLibrary.DataCase
+
+  import MusicBrainz.Fixtures.Release
+  import MusicBrainz.Fixtures.ReleaseGroup
+  import MusicLibrary.Fixtures.Records
+
+  alias MusicLibrary.Records.Record
+  alias MusicLibrary.Worker.ImportFromMusicbrainzRelease
+
+  describe "perform/1" do
+    test "imports a record from a MusicBrainz release" do
+      release_data = release(:marbles)
+      release_id = release_id(:marbles)
+
+      release_group_data = release_group(:marbles)
+      release_group_id = release_group_id(:marbles)
+      release_group_releases_data = release_group_releases(:marbles)
+
+      cover_data = marbles_cover_data()
+
+      Req.Test.stub(MusicBrainz.API, fn conn ->
+        case conn.path_info do
+          [_ws, _version, "release-group", ^release_group_id] ->
+            Req.Test.json(conn, release_group_data)
+
+          [_ws, _version, "release", ^release_id] ->
+            Req.Test.json(conn, release_data)
+
+          [_ws, _version, "release"] ->
+            Req.Test.json(conn, release_group_releases_data)
+
+          [_release_group, ^release_group_id, "front"] ->
+            Plug.Conn.send_resp(conn, 200, cover_data)
+        end
+      end)
+
+      purchased_at = DateTime.utc_now()
+
+      assert :ok =
+               perform_job(ImportFromMusicbrainzRelease, %{
+                 "release_id" => release_id,
+                 "format" => "cd",
+                 "purchased_at" => DateTime.to_iso8601(purchased_at),
+                 "selected_release_id" => release_id
+               })
+
+      imported_record = Repo.get_by!(Record, musicbrainz_id: release_group_id)
+      assert imported_record.title == "Marbles"
+      assert imported_record.purchased_at == DateTime.truncate(purchased_at, :second)
+    end
+
+    test "returns error on transport failure" do
+      Req.Test.stub(MusicBrainz.API, fn conn ->
+        Req.Test.transport_error(conn, :timeout)
+      end)
+
+      assert {:error, %Req.TransportError{reason: :timeout}} =
+               perform_job(ImportFromMusicbrainzRelease, %{
+                 "release_id" => "nonexistent-release-id",
+                 "format" => "cd",
+                 "purchased_at" => DateTime.to_iso8601(DateTime.utc_now()),
+                 "selected_release_id" => "nonexistent-release-id"
+               })
+    end
+  end
+end