update openapi scripts to fetch protobuffer schema

Author: natasha41575

kyaml/openapi/Makefile

@@ -5,7 +5,6 @@ MYGOBIN = $(shell go env GOBIN)
 ifeq ($(MYGOBIN),)
 MYGOBIN = $(shell go env GOPATH)/bin
 endif
-API_VERSION := "v1.21.2"
 KIND_VERSION := "v0.11.1"
 
 .PHONY: all
@@ -46,10 +45,6 @@ kustomizationapi/swagger.go: $(MYGOBIN)/go-bindata kustomizationapi/swagger.json
 		-o kustomizationapi/swagger.go \
 		kustomizationapi/swagger.json
 
-.PHONY: kubernetesapi/openapiinfo.go
-kubernetesapi/openapiinfo.go:
-	./scripts/makeOpenApiInfoDotGo.sh
-
 .PHONY: kubernetesapi/swagger.json
 kubernetesapi/swagger.json: $(MYGOBIN)/kind $(MYGOBIN)/kustomize
 	./scripts/fetchSchemaFromCluster.sh $(API_VERSION)

kyaml/openapi/README.md

@@ -67,11 +67,25 @@ make kubernetesapi/swagger.go API_VERSION=v1.21.2
 While the above commands generate the swagger.go files, they
 do not make them available for use nor do they update the
 info field reported by `kustomize openapi info`. To make the
-newly fetched schema and swagger.go available:
+newly fetched schema and swagger.go available, update the
+file [`kubernetesapi/openapiinfo.go`](https://github.com/kubernetes-sigs/kustomize/blob/master/kyaml/openapi/kubernetesapi/openapiinfo.go). 
+
+Here is an example of what it looks like with v1.21.2. The version number needs to be updated in all five places that it appears:
 
 ```
-rm kubernetesapi/openapiinfo.go
-make kubernetesapi/openapiinfo.go
+package kubernetesapi
+
+import (
+  "sigs.k8s.io/kustomize/kyaml/openapi/kubernetesapi/v1212"
+)
+
+const Info = "{title:Kubernetes,version:v1.21.2}"
+
+var OpenAPIMustAsset = map[string]func(string) []byte{
+"v1212": v1212.MustAsset,
+}
+
+const DefaultOpenAPI = "v1212"
 ```
 
 ## Partial regeneration

kyaml/openapi/openapi_benchmark_test.go

@@ -11,7 +11,6 @@ import (
 	"google.golang.org/protobuf/proto"
 	"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)
@@ -53,12 +52,15 @@ func BenchmarkOpenAPIV2ParseDocument(t *testing.B) {
 }
 
 func BenchmarkProtoUnmarshal(t *testing.B) {
+	version := kubernetesOpenAPIDefaultVersion
+
+	// parse the swagger, this should never fail
 	assetName := filepath.Join(
 		"kubernetesapi",
-		"v1218pb",
+		version,
 		"swagger.pb")
 
-	b := v1218pb.MustAsset(assetName)
+	b := kubernetesapi.OpenAPIMustAsset[version](assetName)
 
 	for i := 0; i < t.N; i++ {
 		// We parse protobuf and get an openapiv2.Document here.

kyaml/openapi/scripts/fetchSchemaFromCluster.sh

@@ -8,8 +8,12 @@ VERSION=$1
 
 cp $HOME/.kube/config /tmp/kubeconfig.txt | true
 $MYGOBIN/kind create cluster --image kindest/node:$VERSION --name=getopenapidata
-$MYGOBIN/kustomize openapi fetch > /tmp/new_swagger.json
+
+# TODO (natasha41575) Add a `kustomize openapi fetch --proto` option
+kubectl proxy &
+curl -k -H "Accept: application/com.github.proto-openapi.spec.v2@v1.0+protobuf" http://localhost:8001/openapi/v2 > /tmp/new_swagger.pb
+
 $MYGOBIN/kind delete cluster --name=getopenapidata
 cp /tmp/kubeconfig.txt $HOME/.kube/config | true
 mkdir -p kubernetesapi/"${VERSION//.}"
-cp /tmp/new_swagger.json kubernetesapi/"${VERSION//.}"/swagger.json
+cp /tmp/new_swagger.pb kubernetesapi/"${VERSION//.}"/swagger.pb

kyaml/openapi/scripts/generateSwaggerDotGo.sh

@@ -9,4 +9,4 @@ VERSION=$1
 $MYGOBIN/go-bindata \
   --pkg "${VERSION//.}" \
   -o kubernetesapi/"${VERSION//.}"/swagger.go \
-  kubernetesapi/"${VERSION//.}"/swagger.json
+  kubernetesapi/"${VERSION//.}"/swagger.pb