Change local media attachments to perform heavy processing asynchronously (#13210)

Fix #9106

lib/paperclip/attachment_extensions.rb

@@ -0,0 +1,30 @@
+# frozen_string_literal: true
+
+module Paperclip
+  module AttachmentExtensions
+    # We overwrite this method to support delayed processing in
+    # Sidekiq. Since we process the original file to reduce disk
+    # usage, and we still want to generate thumbnails straight
+    # away, it's the only style we need to exclude
+    def process_style?(style_name, style_args)
+      if style_name == :original && instance.respond_to?(:delay_processing?) && instance.delay_processing?
+        false
+      else
+        style_args.empty? || style_args.include?(style_name)
+      end
+    end
+
+    def reprocess_original!
+      old_original_path = path(:original)
+      reprocess!(:original)
+      new_original_path = path(:original)
+
+      if new_original_path != old_original_path
+        @queued_for_delete << old_original_path
+        flush_deletes
+      end
+    end
+  end
+end
+
+Paperclip::Attachment.prepend(Paperclip::AttachmentExtensions)