monitoring dashboard dependency vendor

Signed-off-by: junotx <junotx@126.com>

vendor/kubesphere.io/client-go/client/clientCache.go

@@ -0,0 +1,158 @@
+/*
+Copyright 2020 KubeSphere 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 client
+
+import (
+	"strings"
+	"sync"
+
+	"k8s.io/apimachinery/pkg/api/meta"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/apimachinery/pkg/runtime/schema"
+	"k8s.io/apimachinery/pkg/runtime/serializer"
+	"k8s.io/client-go/rest"
+	"sigs.k8s.io/controller-runtime/pkg/client/apiutil"
+)
+
+type ClientCache interface {
+	GetObjMeta(obj runtime.Object) (*ObjMeta, error)
+	GetResource(obj runtime.Object) (*ResourceMeta, error)
+}
+
+func NewClientCache(config *rest.Config, options Options) ClientCache {
+
+	cc := &clientCache{
+		config:         config,
+		scheme:         options.Scheme,
+		mapper:         options.Mapper,
+		codecs:         serializer.NewCodecFactory(options.Scheme),
+		resourceByType: make(map[schema.GroupVersionKind]*ResourceMeta),
+	}
+
+	return cc
+}
+
+// clientCache creates and caches rest clients and metadata for Kubernetes types
+type clientCache struct {
+	// config is the rest.Config to talk to an apiserver
+	config *rest.Config
+
+	// scheme maps go structs to GroupVersionKinds
+	scheme *runtime.Scheme
+
+	// mapper maps GroupVersionKinds to Resources
+	mapper meta.RESTMapper
+
+	// codecs are used to create a REST client for a gvk
+	codecs serializer.CodecFactory
+
+	// resourceByType caches type metadata
+	resourceByType map[schema.GroupVersionKind]*ResourceMeta
+	mu             sync.RWMutex
+}
+
+// newResource maps obj to a Kubernetes Resource and constructs a client for that Resource.
+// If the object is a list, the resource represents the item's type instead.
+func (c *clientCache) newResource(gvk schema.GroupVersionKind, isList bool) (*ResourceMeta, error) {
+	if strings.HasSuffix(gvk.Kind, "List") && isList {
+		// if this was a list, treat it as a request for the item's resource
+		gvk.Kind = gvk.Kind[:len(gvk.Kind)-4]
+	}
+
+	client, err := apiutil.RESTClientForGVK(gvk, c.config, c.codecs)
+	if err != nil {
+		return nil, err
+	}
+	mapping, err := c.mapper.RESTMapping(gvk.GroupKind(), gvk.Version)
+	if err != nil {
+		return nil, err
+	}
+	return &ResourceMeta{Interface: client, mapping: mapping, gvk: gvk}, nil
+}
+
+// GetResource returns the resource meta information for the given type of object.
+// If the object is a list, the resource represents the item's type instead.
+func (c *clientCache) GetResource(obj runtime.Object) (*ResourceMeta, error) {
+	gvk, err := apiutil.GVKForObject(obj, c.scheme)
+	if err != nil {
+		return nil, err
+	}
+
+	// It's better to do creation work twice than to not let multiple
+	// people make requests at once
+	c.mu.RLock()
+	r, known := c.resourceByType[gvk]
+	c.mu.RUnlock()
+
+	if known {
+		return r, nil
+	}
+
+	// Initialize a new Client
+	c.mu.Lock()
+	defer c.mu.Unlock()
+	r, err = c.newResource(gvk, meta.IsListType(obj))
+	if err != nil {
+		return nil, err
+	}
+	c.resourceByType[gvk] = r
+	return r, err
+}
+
+// getObjMeta returns ObjMeta containing both type and object metadata and state
+func (c *clientCache) GetObjMeta(obj runtime.Object) (*ObjMeta, error) {
+	r, err := c.GetResource(obj)
+	if err != nil {
+		return nil, err
+	}
+	m, err := meta.Accessor(obj)
+	if err != nil {
+		return nil, err
+	}
+	return &ObjMeta{ResourceMeta: r, Object: m}, err
+}
+
+// ResourceMeta caches state for a Kubernetes type.
+type ResourceMeta struct {
+	// client is the rest client used to talk to the apiserver
+	rest.Interface
+	// gvk is the GroupVersionKind of the ResourceMeta
+	gvk schema.GroupVersionKind
+	// mapping is the rest mapping
+	mapping *meta.RESTMapping
+}
+
+// IsNamespaced returns true if the type is namespaced
+func (r *ResourceMeta) IsNamespaced() bool {
+	return r.mapping.Scope.Name() != meta.RESTScopeNameRoot
+
+}
+
+// resource returns the resource name of the type
+func (r *ResourceMeta) Resource() string {
+	return r.mapping.Resource.Resource
+}
+
+// ObjMeta stores type and object information about a Kubernetes type
+type ObjMeta struct {
+	// ResourceMeta contains type information for the object
+	*ResourceMeta
+
+	// Object contains meta data for the object instance
+	metav1.Object
+}