Use separate workers to process imports, retry failures (#5207)

app/workers/import/relationship_worker.rb

@@ -0,0 +1,25 @@
+# frozen_string_literal: true
+
+class Import::RelationshipWorker
+  include Sidekiq::Worker
+
+  sidekiq_options queue: 'pull', retry: 8, dead: false
+
+  def perform(account_id, target_account_uri, relationship)
+    from_account   = Account.find(account_id)
+    target_account = ResolveRemoteAccountService.new.call(target_account_uri)
+
+    return if target_account.nil?
+
+    case relationship
+    when 'follow'
+      FollowService.new.call(from_account, target_account.acct)
+    when 'block'
+      BlockService.new.call(from_account, target_account)
+    when 'mute'
+      MuteService.new.call(from_account, target_account)
+    end
+  rescue ActiveRecord::RecordNotFound
+    true
+  end
+end