feat(gatewayapi): check for listener detached

Signed-off-by: Mike Beaumont <mjboamail@gmail.com>

pkg/plugins/runtime/k8s/controllers/gatewayapi/gateway_conversion.go

@@ -27,6 +27,36 @@ func (r *GatewayReconciler) gapiToKumaGateway(
 	portHostnames := map[gatewayapi.PortNumber]gatewayapi.Hostname{}
 	portProtocols := map[gatewayapi.PortNumber]gatewayapi.ProtocolType{}
 	for _, l := range gateway.Spec.Listeners {
+		setDetached := func(reason gatewayapi.ListenerConditionReason, message string) {
+			listenerConditions[l.Name] = append(listenerConditions[l.Name],
+				kube_meta.Condition{
+					Type:    string(gatewayapi.ListenerConditionDetached),
+					Status:  kube_meta.ConditionTrue,
+					Reason:  string(reason),
+					Message: message,
+				},
+				kube_meta.Condition{
+					Type:    string(gatewayapi.ListenerConditionReady),
+					Status:  kube_meta.ConditionFalse,
+					Reason:  string(gatewayapi.ListenerReasonInvalid),
+					Message: "detached",
+				},
+			)
+		}
+
+		switch l.Protocol {
+		case gatewayapi.HTTPProtocolType:
+		case gatewayapi.HTTPSProtocolType:
+			// TODO HTTPS https://github.com/kumahq/kuma/issues/3679
+			fallthrough
+		default:
+			setDetached(gatewayapi.ListenerReasonUnsupportedProtocol, fmt.Sprintf("unsupported protocol %s", l.Protocol))
+			continue
+		}
+
+		// TODO ListenerReasonUnsupportedAddress and ListenerReasonPortUnavailable
+		// need more information from Envoy Gateway
+
 		setConflicted := func(reason gatewayapi.ListenerConditionReason, message string) {
 			listenerConditions[l.Name] = append(listenerConditions[l.Name],
 				kube_meta.Condition{
@@ -139,9 +169,14 @@ func (r *GatewayReconciler) gapiToKumaGateway(
 			}
 		}
 
-		// We've already cleared this listener of conflicts
+		// We've already cleared this listener of conflicts and being detached
 		listenerConditions[l.Name] = append(
 			listenerConditions[l.Name],
+			kube_meta.Condition{
+				Type:   string(gatewayapi.ListenerConditionDetached),
+				Status: kube_meta.ConditionFalse,
+				Reason: string(gatewayapi.ListenerReasonAttached),
+			},
 			kube_meta.Condition{
 				Type:   string(gatewayapi.ListenerConditionConflicted),
 				Status: kube_meta.ConditionFalse,