1 files changed, 65 insertions, 0 deletions
diff --git a/db/post_migrate/20181014121030_enqueue_redact_links.rb b/db/post_migrate/20181014121030_enqueue_redact_links.rb
new file mode 100644
index 00000000000..1ee4703c88a
--- /dev/null
+++ b/db/post_migrate/20181014121030_enqueue_redact_links.rb
@@ -0,0 +1,65 @@
+# frozen_string_literal: true
+
+class EnqueueRedactLinks < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+  BATCH_SIZE = 1000
+  DELAY_INTERVAL = 5.minutes.to_i
+  MIGRATION = 'RedactLinks'
+
+  disable_ddl_transaction!
+
+  class Note < ActiveRecord::Base
+    include EachBatch
+
+    self.table_name = 'notes'
+    self.inheritance_column = :_type_disabled
+  end
+
+  class Issue < ActiveRecord::Base
+    include EachBatch
+
+    self.table_name = 'issues'
+    self.inheritance_column = :_type_disabled
+  end
+
+  class MergeRequest < ActiveRecord::Base
+    include EachBatch
+
+    self.table_name = 'merge_requests'
+    self.inheritance_column = :_type_disabled
+  end
+
+  class Snippet < ActiveRecord::Base
+    include EachBatch
+
+    self.table_name = 'snippets'
+    self.inheritance_column = :_type_disabled
+  end
+
+  def up
+    disable_statement_timeout do
+      schedule_migration(Note, 'note')
+      schedule_migration(Issue, 'description')
+      schedule_migration(MergeRequest, 'description')
+      schedule_migration(Snippet, 'description')
+    end
+  end
+
+  def down
+    # nothing to do
+  end
+
+  private
+
+  def schedule_migration(model, field)
+    link_pattern = "%/sent_notifications/" + ("_" * 32) + "/unsubscribe%"
+
+    model.where("#{field} like ?", link_pattern).each_batch(of: BATCH_SIZE) do |batch, index|
+      start_id, stop_id = batch.pluck('MIN(id)', 'MAX(id)').first
+
+      BackgroundMigrationWorker.perform_in(index * DELAY_INTERVAL, MIGRATION, [model.name.demodulize, field, start_id, stop_id])
+    end
+  end
+end