Change account deletion requests to spread out over time (#20222)

1 files changed, 38 insertions, 0 deletions

diff --git a/app/workers/scheduler/suspended_user_cleanup_scheduler.rb b/app/workers/scheduler/suspended_user_cleanup_scheduler.rb
new file mode 100644
index 000000000..50768f83c
--- /dev/null
+++ b/app/workers/scheduler/suspended_user_cleanup_scheduler.rb
@@ -0,0 +1,38 @@
+# frozen_string_literal: true
+
+class Scheduler::SuspendedUserCleanupScheduler
+  include Sidekiq::Worker
+
+  # Each processed deletion request may enqueue an enormous
+  # amount of jobs in the `pull` queue, so only enqueue when
+  # the queue is empty or close to being so.
+  MAX_PULL_SIZE = 50
+
+  # Since account deletion is very expensive, we want to avoid
+  # overloading the server by queing too much at once.
+  # This job runs approximately once per 2 minutes, so with a
+  # value of `MAX_DELETIONS_PER_JOB` of 10, a server can
+  # handle the deletion of 7200 accounts per day, provided it
+  # has the capacity for it.
+  MAX_DELETIONS_PER_JOB = 10
+
+  sidekiq_options retry: 0
+
+  def perform
+    return if Sidekiq::Queue.new('pull').size > MAX_PULL_SIZE
+
+    clean_suspended_accounts!
+  end
+
+  private
+
+  def clean_suspended_accounts!
+    # This should be fine because we only process a small amount of deletion requests at once and
+    # `id` and `created_at` should follow the same order.
+    AccountDeletionRequest.reorder(id: :asc).take(MAX_DELETIONS_PER_JOB).each do |deletion_request|
+      next unless deletion_request.created_at < AccountDeletionRequest::DELAY_TO_DELETION.ago
+
+      Admin::AccountDeletionWorker.perform_async(deletion_request.account_id)
+    end
+  end
+end