func()

in swim/memberlist.go [345:378]

• 21 lines of code
• 6 McCabe index (conditional complexity)

func (m *memberlist) SetLocalLabels(labels map[string]string) error {
	if err := m.node.labelLimits.validateLabels(m.local.Labels, labels); err != nil {
		// the labels operation violates the label limits that has been configured
		return err
	}

	m.updateLocalMember(func(member *Member) bool {
		// ensure that there is a new copy of the labels to work with.
		labelsCopy := member.Labels.copy()

		// keep track if we made changes to the labels
		changes := false

		// copy the key-value pairs to our internal labels. By not setting the map
		// of labels to the Labels value of the local member we prevent removing labels
		// that the user did not specify in the new map.
		for key, value := range labels {
			old, had := labelsCopy[key]
			labelsCopy[key] = value

			if !had || old != value {
				changes = true
			}
		}

		if changes {
			// only if there are changes we put the copied labels on the member.
			member.Labels = labelsCopy
		}
		return changes
	})

	return nil
}