Add benchmark test for parsing openapi in protobuf format

kyaml/openapi/kubernetesapi/v1218pb/doc.go

@@ -0,0 +1,3 @@
+package v1218pb
+
+const OpenAPIProtobuf = "v1218pb"

kyaml/openapi/openapi_benchmark_test.go

@@ -7,8 +7,11 @@ import (
 	"path/filepath"
 	"testing"
 
+	"github.com/golang/protobuf/proto"
+	openapi_v2 "github.com/googleapis/gnostic/openapiv2"
 	"k8s.io/kube-openapi/pkg/validation/spec"
 	"sigs.k8s.io/kustomize/kyaml/openapi/kubernetesapi"
+	"sigs.k8s.io/kustomize/kyaml/openapi/kubernetesapi/v1218pb"
 )
 
 // Benchmark for swagger parsing (UnmarshalJSON)
@@ -31,6 +34,40 @@ func BenchmarkSwaggerUnmarshalJSON(t *testing.B) {
 	}
 }
 
+func BenchmarkOpenAPIV2ParseDocument(t *testing.B) {
+	version := kubernetesOpenAPIDefaultVersion
+
+	assetName := filepath.Join(
+		"kubernetesapi",
+		version,
+		"swagger.json")
+
+	b := kubernetesapi.OpenAPIMustAsset[version](assetName)
+
+	for i := 0; i < t.N; i++ {
+		// We parse JSON and get an openapiv2.Document here.
+		if _, err := openapi_v2.ParseDocument(b); err != nil {
+			t.Fatalf("openapi_v2.ParseDocument failed: %v", err)
+		}
+	}
+}
+
+func BenchmarkProtoUnmarshal(t *testing.B) {
+	assetName := filepath.Join(
+		"kubernetesapi",
+		"v1218pb",
+		"swagger.pb")
+
+	b := v1218pb.MustAsset(assetName)
+
+	for i := 0; i < t.N; i++ {
+		// We parse protobuf and get an openapiv2.Document here.
+		if err := proto.Unmarshal(b, &openapi_v2.Document{}); err != nil {
+			t.Fatalf("proto.Unmarshal failed: %v", err)
+		}
+	}
+}
+
 // Benchmark for loading assets packed into the binary
 func BenchmarkAssetRead(t *testing.B) {
 	for i := 0; i < t.N; i++ {