Add support for FASP data sharing (#34415)

app/workers/fasp/backfill_worker.rb

@@ -0,0 +1,32 @@
+# frozen_string_literal: true
+
+class Fasp::BackfillWorker
+  include Sidekiq::Worker
+
+  sidekiq_options queue: 'fasp', retry: 5
+
+  def perform(backfill_request_id)
+    backfill_request = Fasp::BackfillRequest.find(backfill_request_id)
+
+    announce(backfill_request)
+
+    backfill_request.advance!
+  rescue ActiveRecord::RecordNotFound
+    # ignore missing backfill requests
+  end
+
+  private
+
+  def announce(backfill_request)
+    Fasp::Request.new(backfill_request.fasp_provider).post('/data_sharing/v0/announcements', body: {
+      source: {
+        backfillRequest: {
+          id: backfill_request.id.to_s,
+        },
+      },
+      category: backfill_request.category,
+      objectUris: backfill_request.next_uris,
+      moreObjectsAvailable: backfill_request.more_objects_available?,
+    })
+  end
+end