Merge pull request #22420 from AdoHe/kubectl_swagger_cache

Auto commit by PR queue bot

pkg/api/validation/schema.go

@@ -44,6 +44,14 @@ func NewInvalidTypeError(expected reflect.Kind, observed reflect.Kind, fieldName
 	return &InvalidTypeError{expected, observed, fieldName}
 }
 
+// TypeNotFoundError is returned when specified type
+// can not found in schema
+type TypeNotFoundError string
+
+func (tnfe TypeNotFoundError) Error() string {
+	return fmt.Sprintf("couldn't find type: %s", string(tnfe))
+}
+
 // Schema is an interface that knows how to validate an API object serialized to a byte array.
 type Schema interface {
 	ValidateBytes(data []byte) error
@@ -164,7 +172,7 @@ func (s *SwaggerSchema) ValidateObject(obj interface{}, fieldName, typeName stri
 	models := s.api.Models
 	model, ok := models.At(typeName)
 	if !ok {
-		return append(allErrs, fmt.Errorf("couldn't find type: %s", typeName))
+		return append(allErrs, TypeNotFoundError(typeName))
 	}
 	properties := model.Properties
 	if len(properties.List) == 0 {

pkg/kubectl/cmd/util/factory.go

@@ -729,6 +729,7 @@ func writeSchemaFile(schemaData []byte, cacheDir, cacheFile, prefix, groupVersio
 
 func getSchemaAndValidate(c schemaClient, data []byte, prefix, groupVersion, cacheDir string) (err error) {
 	var schemaData []byte
+	var firstSeen bool
 	fullDir, err := substituteUserHome(cacheDir)
 	if err != nil {
 		return err
@@ -741,24 +742,50 @@ func getSchemaAndValidate(c schemaClient, data []byte, prefix, groupVersion, cac
 		}
 	}
 	if schemaData == nil {
-		schemaData, err = c.Get().
-			AbsPath("/swaggerapi", prefix, groupVersion).
-			Do().
-			Raw()
+		firstSeen = true
+		schemaData, err = downloadSchemaAndStore(c, cacheDir, fullDir, cacheFile, prefix, groupVersion)
 		if err != nil {
 			return err
 		}
-		if len(cacheDir) != 0 {
-			if err := writeSchemaFile(schemaData, fullDir, cacheFile, prefix, groupVersion); err != nil {
-				return err
-			}
-		}
 	}
 	schema, err := validation.NewSwaggerSchemaFromBytes(schemaData)
 	if err != nil {
 		return err
 	}
-	return schema.ValidateBytes(data)
+	err = schema.ValidateBytes(data)
+	if _, ok := err.(validation.TypeNotFoundError); ok && !firstSeen {
+		// As a temporay hack, kubectl would re-get the schema if validation
+		// fails for type not found reason.
+		// TODO: runtime-config settings needs to make into the file's name
+		schemaData, err = downloadSchemaAndStore(c, cacheDir, fullDir, cacheFile, prefix, groupVersion)
+		if err != nil {
+			return err
+		}
+		schema, err := validation.NewSwaggerSchemaFromBytes(schemaData)
+		if err != nil {
+			return err
+		}
+		return schema.ValidateBytes(data)
+	}
+
+	return err
+}
+
+// Download swagger schema from apiserver and store it to file.
+func downloadSchemaAndStore(c schemaClient, cacheDir, fullDir, cacheFile, prefix, groupVersion string) (schemaData []byte, err error) {
+	schemaData, err = c.Get().
+		AbsPath("/swaggerapi", prefix, groupVersion).
+		Do().
+		Raw()
+	if err != nil {
+		return
+	}
+	if len(cacheDir) != 0 {
+		if err = writeSchemaFile(schemaData, fullDir, cacheFile, prefix, groupVersion); err != nil {
+			return
+		}
+	}
+	return
 }
 
 func (c *clientSwaggerSchema) ValidateBytes(data []byte) error {

pkg/kubectl/cmd/util/factory_test.go

@@ -32,6 +32,7 @@ import (
 	"k8s.io/kubernetes/pkg/api/testapi"
 	"k8s.io/kubernetes/pkg/api/unversioned"
 	"k8s.io/kubernetes/pkg/api/validation"
+	"k8s.io/kubernetes/pkg/apis/extensions"
 	"k8s.io/kubernetes/pkg/client/unversioned/clientcmd"
 	clientcmdapi "k8s.io/kubernetes/pkg/client/unversioned/clientcmd/api"
 	"k8s.io/kubernetes/pkg/client/unversioned/fake"
@@ -215,6 +216,63 @@ func loadSchemaForTest() (validation.Schema, error) {
 	return validation.NewSwaggerSchemaFromBytes(data)
 }
 
+func TestRefetchSchemaWhenValidationFails(t *testing.T) {
+	schema, err := loadSchemaForTest()
+	if err != nil {
+		t.Errorf("Error loading schema: %v", err)
+		t.FailNow()
+	}
+	output, err := json.Marshal(schema)
+	if err != nil {
+		t.Errorf("Error serializing schema: %v", err)
+		t.FailNow()
+	}
+	requests := map[string]int{}
+
+	c := &fake.RESTClient{
+		Codec: testapi.Default.Codec(),
+		Client: fake.CreateHTTPClient(func(req *http.Request) (*http.Response, error) {
+			switch p, m := req.URL.Path, req.Method; {
+			case strings.HasPrefix(p, "/swaggerapi") && m == "GET":
+				requests[p] = requests[p] + 1
+				return &http.Response{StatusCode: 200, Body: ioutil.NopCloser(bytes.NewBuffer(output))}, nil
+			default:
+				t.Fatalf("unexpected request: %#v\n%#v", req.URL, req)
+				return nil, nil
+			}
+		}),
+	}
+	dir := os.TempDir() + "/schemaCache"
+	os.RemoveAll(dir)
+
+	fullDir, err := substituteUserHome(dir)
+	if err != nil {
+		t.Errorf("Error getting fullDir: %v", err)
+		t.FailNow()
+	}
+	cacheFile := path.Join(fullDir, "foo", "bar", schemaFileName)
+	err = writeSchemaFile(output, fullDir, cacheFile, "foo", "bar")
+	if err != nil {
+		t.Errorf("Error building old cache schema: %v", err)
+		t.FailNow()
+	}
+
+	obj := &extensions.Deployment{}
+	data, err := runtime.Encode(testapi.Extensions.Codec(), obj)
+	if err != nil {
+		t.Errorf("unexpected error: %v", err)
+		t.FailNow()
+	}
+
+	// Re-get request, should use HTTP and write
+	if getSchemaAndValidate(c, data, "foo", "bar", dir); err != nil {
+		t.Errorf("unexpected error validating: %v", err)
+	}
+	if requests["/swaggerapi/foo/bar"] != 1 {
+		t.Errorf("expected 1 schema request, saw: %d", requests["/swaggerapi/foo/bar"])
+	}
+}
+
 func TestValidateCachesSchema(t *testing.T) {
 	schema, err := loadSchemaForTest()
 	if err != nil {
@@ -266,7 +324,7 @@ func TestValidateCachesSchema(t *testing.T) {
 	if getSchemaAndValidate(c, data, "foo", "bar", dir); err != nil {
 		t.Errorf("unexpected error validating: %v", err)
 	}
-	if requests["/swaggerapi/foo/bar"] != 1 {
+	if requests["/swaggerapi/foo/bar"] != 2 {
 		t.Errorf("expected 1 schema request, saw: %d", requests["/swaggerapi/foo/bar"])
 	}