zones: introduce Machine.getRingInfo()

and refactor Machine.applyRingInfo()

Signed-off-by: Alejandro Mery <amery@jpi.io>

pkg/zones/machine_rings.go

@@ -60,17 +60,19 @@ func (m *Machine) applyWireguardConfig(ring int, wg *wireguard.Config) error {
 	return nil
 }
 
-func (m *Machine) applyRingInfo(ring int, new *RingInfo) error {
-	var cur *RingInfo
-
+func (m *Machine) getRingInfo(ring int) (*RingInfo, bool) {
 	for _, ri := range m.RingAddresses {
 		if ri.Ring == ring {
-			cur = ri
-			break
+			return ri, true
 		}
 	}
 
-	if cur == nil {
+	return nil, false
+}
+
+func (m *Machine) applyRingInfo(ring int, new *RingInfo) error {
+	cur, found := m.getRingInfo(ring)
+	if !found {
 		// first, append
 		m.RingAddresses = append(m.RingAddresses, new)
 		return nil