feat(*): add trafficsplit v1alpha4 api

Signed-off-by: Michelle Noorali <[email protected]>

hack/update-codegen.sh

@@ -60,7 +60,7 @@ generate_client "specs" "v1alpha1,v1alpha2,v1alpha3,v1alpha4"
 
 echo ""
 echo "###### Generating split client ######"
-generate_client "split" "v1alpha1,v1alpha2,v1alpha3"
+generate_client "split" "v1alpha1,v1alpha2,v1alpha3,v1alpha4"
 
 echo ""
 echo "##### Generating access client ######"

pkg/apis/split/v1alpha4/doc.go

@@ -0,0 +1,4 @@
+// +k8s:deepcopy-gen=package
+// +groupName=split.smi-spec.io
+
+package v1alpha4

pkg/apis/split/v1alpha4/register.go

@@ -0,0 +1,48 @@
+package v1alpha4
+
+import (
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/apimachinery/pkg/runtime/schema"
+
+	ts "github.com/servicemeshinterface/smi-sdk-go/pkg/apis/split"
+)
+
+// SchemeGroupVersion is the identifier for the API which includes
+// the name of the group and the version of the API
+var SchemeGroupVersion = schema.GroupVersion{
+	Group:   ts.GroupName,
+	Version: "v1alpha4",
+}
+
+// Kind takes an unqualified kind and returns back a Group qualified GroupKind
+func Kind(kind string) schema.GroupKind {
+	return SchemeGroupVersion.WithKind(kind).GroupKind()
+}
+
+// Resource takes an unqualified resource and returns a Group qualified GroupResource
+func Resource(resource string) schema.GroupResource {
+	return SchemeGroupVersion.WithResource(resource).GroupResource()
+}
+
+var (
+	// SchemeBuilder collects functions that add things to a scheme. It's to allow
+	// code to compile without explicitly referencing generated types. You should
+	// declare one in each package that will have generated deep copy or conversion
+	// functions.
+	SchemeBuilder = runtime.NewSchemeBuilder(addKnownTypes)
+
+	// AddToScheme applies all the stored functions to the scheme. A non-nil error
+	// indicates that one function failed and the attempt was abandoned.
+	AddToScheme = SchemeBuilder.AddToScheme
+)
+
+// Adds the list of known types to Scheme.
+func addKnownTypes(scheme *runtime.Scheme) error {
+	scheme.AddKnownTypes(SchemeGroupVersion,
+		&TrafficSplit{},
+		&TrafficSplitList{},
+	)
+	metav1.AddToGroupVersion(scheme, SchemeGroupVersion)
+	return nil
+}

pkg/apis/split/v1alpha4/traffic_split.go

@@ -0,0 +1,60 @@
+package v1alpha4
+
+import (
+	corev1 "k8s.io/api/core/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+)
+
+// +genclient
+// +genclient:noStatus
+// +k8s:deepcopy-gen:interfaces=k8s.io/apimachinery/pkg/runtime.Object
+
+// TrafficSplit allows users to incrementally direct percentages of traffic
+// between various services. It will be used by clients such as ingress
+// controllers or service mesh sidecars to split the outgoing traffic to
+// different destinations.
+type TrafficSplit struct {
+	metav1.TypeMeta `json:",inline"`
+	// Standard object's metadata.
+	// More info: https://git.k8s.io/community/contributors/devel/api-conventions.md#metadata
+	// +optional
+	metav1.ObjectMeta `json:"metadata,omitempty"`
+
+	// Specification of the desired behavior of the traffic split.
+	// More info: https://git.k8s.io/community/contributors/devel/api-conventions.md#spec-and-status
+	// +optional
+	Spec TrafficSplitSpec `json:"spec,omitempty"`
+}
+
+// TrafficSplitSpec is the specification for a TrafficSplit
+type TrafficSplitSpec struct {
+	// Service represents the apex service
+	Service string `json:"service"`
+
+	// Backends defines a list of Kubernetes services
+	// used as the traffic split destination
+	Backends []TrafficSplitBackend `json:"backends"`
+
+	// Matches allows defining a list of HTTP route groups
+	// that this traffic split object should match
+	// +optional
+	Matches []corev1.TypedLocalObjectReference `json:"matches,omitempty"`
+}
+
+// TrafficSplitBackend defines a backend
+type TrafficSplitBackend struct {
+	// Service is the name of a Kubernetes service
+	Service string `json:"service"`
+
+	// Weight defines the traffic split percentage
+	Weight int `json:"weight"`
+}
+
+// +k8s:deepcopy-gen:interfaces=k8s.io/apimachinery/pkg/runtime.Object
+
+type TrafficSplitList struct {
+	metav1.TypeMeta `json:",inline"`
+	metav1.ListMeta `json:"metadata"`
+
+	Items []TrafficSplit `json:"items"`
+}