Introduce a Req.RateLimiter module to fix API rate limit issues

lib/music_library/application.ex

@@ -10,6 +10,7 @@ defmodule MusicLibrary.Application do
   @impl true
   def start(_type, _args) do
     _ = Assets.Cache.new()
+    _ = Req.RateLimiter.new()
 
     children = [
       MusicLibrary.Vault,

lib/music_library/worker/artist_refresh_discogs_data.ex

@@ -3,10 +3,6 @@ defmodule MusicLibrary.Worker.ArtistRefreshDiscogsData do
 
   @impl Oban.Worker
   def perform(%Oban.Job{args: %{"id" => artist_info_id}}) do
-    result = MusicLibrary.Artists.refresh_discogs_data(artist_info_id)
-
-    Process.sleep(Discogs.api_cooldown())
-
-    result
+    MusicLibrary.Artists.refresh_discogs_data(artist_info_id)
   end
 end

lib/music_library/worker/artist_refresh_music_brainz_data.ex

@@ -3,10 +3,6 @@ defmodule MusicLibrary.Worker.ArtistRefreshMusicBrainzData do
 
   @impl Oban.Worker
   def perform(%Oban.Job{args: %{"id" => artist_info_id}}) do
-    result = MusicLibrary.Artists.refresh_musicbrainz_data(artist_info_id)
-
-    Process.sleep(MusicBrainz.api_cooldown())
-
-    result
+    MusicLibrary.Artists.refresh_musicbrainz_data(artist_info_id)
   end
 end

lib/music_library/worker/fetch_artist_last_fm_data.ex

@@ -3,14 +3,9 @@ defmodule MusicLibrary.Worker.FetchArtistLastFmData do
 
   @impl Oban.Worker
   def perform(%Oban.Job{args: %{"id" => artist_id}}) do
-    result =
-      case MusicLibrary.Artists.fetch_lastfm_data(artist_id) do
-        {:ok, _artist_info} -> :ok
-        error -> error
-      end
-
-    Process.sleep(LastFm.api_cooldown())
-
-    result
+    case MusicLibrary.Artists.fetch_lastfm_data(artist_id) do
+      {:ok, _artist_info} -> :ok
+      error -> error
+    end
   end
 end

lib/music_library/worker/record_refresh_music_brainz_data.ex

@@ -5,13 +5,8 @@ defmodule MusicLibrary.Worker.RecordRefreshMusicBrainzData do
   def perform(%Oban.Job{args: %{"id" => record_id}}) do
     record = MusicLibrary.Records.get_record!(record_id)
 
-    result =
-      with {:ok, updated_record} <- MusicLibrary.Records.refresh_musicbrainz_data(record) do
-        MusicLibrary.Records.notify_update(updated_record)
-      end
-
-    Process.sleep(MusicBrainz.api_cooldown())
-
-    result
+    with {:ok, updated_record} <- MusicLibrary.Records.refresh_musicbrainz_data(record) do
+      MusicLibrary.Records.notify_update(updated_record)
+    end
   end
 end