Revert "Separate Build and Serving parts of OpenAPI spec handler"

staging/src/k8s.io/apiserver/pkg/server/openapi/openapi.go

@@ -17,17 +17,26 @@ limitations under the License.
 package openapi
 
 import (
+	"bytes"
+	"compress/gzip"
 	"crypto/sha512"
 	"encoding/json"
 	"fmt"
+	"gopkg.in/yaml.v2"
+	"mime"
 	"net/http"
 	"reflect"
 	"strings"
+	"time"
 
 	restful "github.com/emicklei/go-restful"
 	"github.com/go-openapi/spec"
+	"github.com/golang/protobuf/proto"
+	"github.com/googleapis/gnostic/OpenAPIv2"
+	"github.com/googleapis/gnostic/compiler"
 
 	"k8s.io/apimachinery/pkg/openapi"
+	genericmux "k8s.io/apiserver/pkg/server/mux"
 	"k8s.io/apiserver/pkg/util/trie"
 )
 
@@ -46,6 +55,10 @@ const (
 type openAPI struct {
 	config       *openapi.Config
 	swagger      *spec.Swagger
+	swaggerBytes []byte
+	swaggerPb    []byte
+	swaggerPbGz  []byte
+	lastModified time.Time
 	protocolList []string
 	definitions  map[string]openapi.OpenAPIDefinition
 }
@@ -54,9 +67,17 @@ func computeEtag(data []byte) string {
 	return fmt.Sprintf("\"%X\"", sha512.Sum512(data))
 }
 
-func BuildSwaggerSpec(webServices []*restful.WebService, config *openapi.Config) (*spec.Swagger, error) {
+// RegisterOpenAPIService registers a handler to provides standard OpenAPI specification.
+func RegisterOpenAPIService(servePath string, webServices []*restful.WebService, config *openapi.Config, mux *genericmux.PathRecorderMux) (err error) {
+
+	if !strings.HasSuffix(servePath, JSON_EXT) {
+		return fmt.Errorf("Serving path must ends with \"%s\".", JSON_EXT)
+	}
+
+	servePathBase := servePath[:len(servePath)-len(JSON_EXT)]
+
 	o := openAPI{
-		config: config,
+		config:    config,
 		swagger: &spec.Swagger{
 			SwaggerProps: spec.SwaggerProps{
 				Swagger:     OpenAPIVersion,
@@ -67,12 +88,44 @@ func BuildSwaggerSpec(webServices []*restful.WebService, config *openapi.Config)
 		},
 	}
 
-	err := o.init(webServices)
+	err = o.init(webServices)
 	if err != nil {
-		return nil, err
+		return err
+	}
+
+	mime.AddExtensionType(".json", MIME_JSON)
+	mime.AddExtensionType(".pb-v1", MIME_PB)
+	mime.AddExtensionType(".gz", MIME_PB_GZ)
+
+	type fileInfo struct {
+		ext  string
+		data []byte
+	}
+
+	files := []fileInfo{
+		{".json", o.swaggerBytes},
+		{"-2.0.0.json", o.swaggerBytes},
+		{"-2.0.0.pb-v1", o.swaggerPb},
+		{"-2.0.0.pb-v1.gz", o.swaggerPbGz},
+	}
+
+	for _, file := range files {
+		path := servePathBase + file.ext
+		data := file.data
+		etag := computeEtag(file.data)
+		mux.HandleFunc(path, func(w http.ResponseWriter, r *http.Request) {
+			if r.URL.Path != path {
+				w.WriteHeader(http.StatusNotFound)
+				w.Write([]byte("Path not found!"))
+				return
+			}
+			w.Header().Set("Etag", etag)
+			// ServeContent will take care of caching using eTag.
+			http.ServeContent(w, r, path, o.lastModified, bytes.NewReader(data))
+		})
 	}
 
-	return o.swagger, nil
+	return nil
 }
 
 func (o *openAPI) init(webServices []*restful.WebService) error {
@@ -88,7 +141,7 @@ func (o *openAPI) init(webServices []*restful.WebService) error {
 	}
 	o.definitions = o.config.GetDefinitions(func(name string) spec.Ref {
 		defName, _ := o.config.GetDefinitionName(name)
-		return spec.MustCreateRef(DEFINITION_PREFIX + openapi.EscapeJsonPointer(defName))
+		return spec.MustCreateRef("#/definitions/" + openapi.EscapeJsonPointer(defName))
 	})
 	if o.config.CommonResponses == nil {
 		o.config.CommonResponses = map[int]spec.Response{}
@@ -108,9 +161,41 @@ func (o *openAPI) init(webServices []*restful.WebService) error {
 		}
 	}
 
+	o.swaggerBytes, err = json.MarshalIndent(o.swagger, " ", " ")
+	if err != nil {
+		return err
+	}
+	o.swaggerPb, err = toProtoBinary(o.swaggerBytes)
+	if err != nil {
+		return err
+	}
+	o.swaggerPbGz = toGzip(o.swaggerPb)
+	o.lastModified = time.Now()
+
 	return nil
 }
 
+func toProtoBinary(spec []byte) ([]byte, error) {
+	var info yaml.MapSlice
+	err := yaml.Unmarshal(spec, &info)
+	if err != nil {
+		return nil, err
+	}
+	document, err := openapi_v2.NewDocument(info, compiler.NewContext("$root", nil))
+	if err != nil {
+		return nil, err
+	}
+	return proto.Marshal(document)
+}
+
+func toGzip(data []byte) []byte {
+	var buf bytes.Buffer
+	zw := gzip.NewWriter(&buf)
+	zw.Write(data)
+	zw.Close()
+	return buf.Bytes()
+}
+
 func getCanonicalizeTypeName(t reflect.Type) string {
 	if t.PkgPath() == "" {
 		return t.Name()
@@ -166,7 +251,7 @@ func (o *openAPI) buildDefinitionForType(sample interface{}) (string, error) {
 		return "", err
 	}
 	defName, _ := o.config.GetDefinitionName(name)
-	return DEFINITION_PREFIX + openapi.EscapeJsonPointer(defName), nil
+	return "#/definitions/" + openapi.EscapeJsonPointer(defName), nil
 }
 
 // buildPaths builds OpenAPI paths using go-restful's web services.

staging/src/k8s.io/apiserver/pkg/server/openapi/openapi_handler.go

-/*
-Copyright 2017 The Kubernetes Authors.
-
-Licensed under the Apache License, Version 2.0 (the "License");
-you may not use this file except in compliance with the License.
-You may obtain a copy of the License at
-
-    http://www.apache.org/licenses/LICENSE-2.0
-
-Unless required by applicable law or agreed to in writing, software
-distributed under the License is distributed on an "AS IS" BASIS,
-WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-See the License for the specific language governing permissions and
-limitations under the License.
-*/
-
-package openapi
-
-import (
-	"bytes"
-	"compress/gzip"
-	"encoding/json"
-	"fmt"
-	"mime"
-	"net/http"
-	"strings"
-	"time"
-
-	"github.com/NYTimes/gziphandler"
-	"github.com/go-openapi/spec"
-	"github.com/golang/protobuf/proto"
-	"github.com/googleapis/gnostic/OpenAPIv2"
-	"github.com/googleapis/gnostic/compiler"
-	"gopkg.in/yaml.v2"
-	genericmux "k8s.io/apiserver/pkg/server/mux"
-)
-
-type OpenAPIService struct {
-	orgSpec      *spec.Swagger
-	specBytes    []byte
-	specPb       []byte
-	specPbGz     []byte
-	lastModified time.Time
-	updateHooks  []func(*http.Request)
-}
-
-// RegisterOpenAPIService registers a handler to provides standard OpenAPI specification.
-func RegisterOpenAPIService(openapiSpec *spec.Swagger, servePath string, mux *genericmux.PathRecorderMux) (*OpenAPIService, error) {
-	if !strings.HasSuffix(servePath, JSON_EXT) {
-		return nil, fmt.Errorf("Serving path must ends with \"%s\".", JSON_EXT)
-	}
-
-	servePathBase := servePath[:len(servePath)-len(JSON_EXT)]
-
-	o := OpenAPIService{}
-	if err := o.UpdateSpec(openapiSpec); err != nil {
-		return nil, err
-	}
-
-	mime.AddExtensionType(".json", MIME_JSON)
-	mime.AddExtensionType(".pb-v1", MIME_PB)
-	mime.AddExtensionType(".gz", MIME_PB_GZ)
-
-	type fileInfo struct {
-		ext     string
-		getData func() []byte
-	}
-
-	files := []fileInfo{
-		{".json", o.getSwaggerBytes},
-		{"-2.0.0.json", o.getSwaggerBytes},
-		{"-2.0.0.pb-v1", o.getSwaggerPbBytes},
-		{"-2.0.0.pb-v1.gz", o.getSwaggerPbGzBytes},
-	}
-
-	for _, file := range files {
-		path := servePathBase + file.ext
-		getData := file.getData
-		mux.Handle(path, gziphandler.GzipHandler(http.HandlerFunc(
-			func(w http.ResponseWriter, r *http.Request) {
-				if r.URL.Path != path {
-					w.WriteHeader(http.StatusNotFound)
-					w.Write([]byte("Path not found!"))
-					return
-				}
-				o.update(r)
-				data := getData()
-				etag := computeEtag(data)
-				w.Header().Set("Etag", etag)
-
-				// ServeContent will take care of caching using eTag.
-				http.ServeContent(w, r, path, o.lastModified, bytes.NewReader(data))
-			}),
-		))
-	}
-
-	return &o, nil
-}
-
-func (o *OpenAPIService) getSwaggerBytes() []byte {
-	return o.specBytes
-}
-
-func (o *OpenAPIService) getSwaggerPbBytes() []byte {
-	return o.specPb
-}
-
-func (o *OpenAPIService) getSwaggerPbGzBytes() []byte {
-	return o.specPbGz
-}
-
-func (o *OpenAPIService) GetSpec() *spec.Swagger {
-	return o.orgSpec
-}
-
-func (o *OpenAPIService) UpdateSpec(openapiSpec *spec.Swagger) (err error) {
-	o.orgSpec = openapiSpec
-	o.specBytes, err = json.MarshalIndent(openapiSpec, " ", " ")
-	if err != nil {
-		return err
-	}
-	o.specPb, err = toProtoBinary(o.specBytes)
-	if err != nil {
-		return err
-	}
-	o.specPbGz = toGzip(o.specPb)
-	o.lastModified = time.Now()
-
-	return nil
-}
-
-func toProtoBinary(spec []byte) ([]byte, error) {
-	var info yaml.MapSlice
-	err := yaml.Unmarshal(spec, &info)
-	if err != nil {
-		return nil, err
-	}
-	document, err := openapi_v2.NewDocument(info, compiler.NewContext("$root", nil))
-	if err != nil {
-		return nil, err
-	}
-	return proto.Marshal(document)
-}
-
-func toGzip(data []byte) []byte {
-	var buf bytes.Buffer
-	zw := gzip.NewWriter(&buf)
-	zw.Write(data)
-	zw.Close()
-	return buf.Bytes()
-}
-
-// Adds an update hook to be called on each spec request. The hook is responsible
-// to call UpdateSpec method.
-func (o *OpenAPIService) AddUpdateHook(hook func(*http.Request)) {
-	o.updateHooks = append(o.updateHooks, hook)
-}
-
-func (o *OpenAPIService) update(r *http.Request) {
-	for _, h := range o.updateHooks {
-		h(r)
-	}
-}

staging/src/k8s.io/apiserver/pkg/server/routes/openapi.go

@@ -32,16 +32,9 @@ type OpenAPI struct {
 }
 
 // Install adds the SwaggerUI webservice to the given mux.
-func (oa OpenAPI) Install(c *restful.Container, mux *mux.PathRecorderMux) *apiserveropenapi.OpenAPIService {
-	openapiSpec, err := apiserveropenapi.BuildSwaggerSpec(c.RegisteredWebServices(), oa.Config)
+func (oa OpenAPI) Install(c *restful.Container, mux *mux.PathRecorderMux) {
+	err := apiserveropenapi.RegisterOpenAPIService("/swagger.json", c.RegisteredWebServices(), oa.Config, mux)
 	if err != nil {
 		glog.Fatalf("Failed to register open api spec for root: %v", err)
-		return nil
 	}
-	service, err := apiserveropenapi.RegisterOpenAPIService(openapiSpec, "/swagger.json", mux)
-	if err != nil {
-		glog.Fatalf("Failed to register open api spec for root: %v", err)
-		return nil
-	}
-	return service
 }