+ needupdate = {}
+ nullify_attrs(attrs).each do |k,v|
+ if !v.nil? && u.send(k) != v
+ needupdate[k] = v
+ end
+ end
+ if needupdate.length > 0
+ begin
+ u.update!(needupdate)
+ rescue ActiveRecord::RecordInvalid
+ loginCluster = Rails.configuration.Login.LoginCluster
+ if u.uuid[0..4] == loginCluster && !needupdate[:username].nil?
+ local_user = User.find_by_username(needupdate[:username])
+ # The username of this record conflicts with an existing,
+ # different user record. This can happen because the
+ # username changed upstream on the login cluster, or
+ # because we're federated with another cluster with a user
+ # by the same username. The login cluster is the source
+ # of truth, so change the username on the conflicting
+ # record and retry the update operation.
+ if local_user.uuid != u.uuid
+ new_username = "#{needupdate[:username]}#{rand(99999999)}"
+ Rails.logger.warn("cached username '#{needupdate[:username]}' collision with user '#{local_user.uuid}' - renaming to '#{new_username}' before retrying")
+ local_user.update!({username: new_username})
+ retry
+ end
+ end
+ raise # Not the issue we're handling above
+ end
+ end