Expose additional fields for port Service spec to support features such as topology based routing (#769)

Author: thegridman

api/v1/coherence_types.go

@@ -2184,6 +2184,35 @@ type ServiceSpec struct {
 	// This field is alpha-level and is only honored by servers that enable the ServiceLBNodePortControl feature.
 	// +optional
 	AllocateLoadBalancerNodePorts *bool `json:"allocateLoadBalancerNodePorts,omitempty"`
+	// loadBalancerClass is the class of the load balancer implementation this Service belongs to.
+	// If specified, the value of this field must be a label-style identifier, with an optional prefix,
+	// e.g. "internal-vip" or "example.com/internal-vip". Unprefixed names are reserved for end-users.
+	// This field can only be set when the Service type is 'LoadBalancer'. If not set, the default load
+	// balancer implementation is used, today this is typically done through the cloud provider integration,
+	// but should apply for any default implementation. If set, it is assumed that a load balancer
+	// implementation is watching for Services with a matching class. Any default load balancer
+	// implementation (e.g. cloud providers) should ignore Services that set this field.
+	// This field can only be set when creating or updating a Service to type 'LoadBalancer'.
+	// Once set, it can not be changed. This field will be wiped when a service is updated to a non 'LoadBalancer' type.
+	// +optional
+	LoadBalancerClass *string `json:"loadBalancerClass,omitempty"`
+	// InternalTrafficPolicy describes how nodes distribute service traffic they
+	// receive on the ClusterIP. If set to "Local", the proxy will assume that pods
+	// only want to talk to endpoints of the service on the same node as the pod,
+	// dropping the traffic if there are no local endpoints. The default value,
+	// "Cluster", uses the standard behavior of routing to all endpoints evenly
+	// (possibly modified by topology and other features).
+	// +optional
+	InternalTrafficPolicy *corev1.ServiceInternalTrafficPolicy `json:"internalTrafficPolicy,omitempty"`
+	// TrafficDistribution offers a way to express preferences for how traffic
+	// is distributed to Service endpoints. Implementations can use this field
+	// as a hint, but are not required to guarantee strict adherence. If the
+	// field is not set, the implementation will apply its default routing
+	// strategy. If set to "PreferClose", implementations should prioritize
+	// endpoints that are in the same zone.
+	// +featureGate=ServiceTrafficDistribution
+	// +optional
+	TrafficDistribution *string `json:"trafficDistribution,omitempty"`
 }
 
 // GetName returns the name of the service.
@@ -2246,6 +2275,9 @@ func (in *ServiceSpec) createServiceSpec() corev1.ServiceSpec {
 		spec.IPFamilyPolicy = in.IPFamilyPolicy
 		spec.IPFamilies = in.IPFamilies
 		spec.SessionAffinityConfig = in.SessionAffinityConfig
+		spec.LoadBalancerClass = in.LoadBalancerClass
+		spec.InternalTrafficPolicy = in.InternalTrafficPolicy
+		spec.TrafficDistribution = in.TrafficDistribution
 	}
 	return spec
 }