Moved memory-cached and disk-cached discovery to their own packages

Kubernetes-commit: 6666049898f93932655fef24f807bc4d6e439fc6

discovery/cached/disk/cached_discovery_test.go

@@ -0,0 +1,188 @@
+/*
+Copyright 2016 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 disk
+
+import (
+	"io/ioutil"
+	"os"
+	"testing"
+	"time"
+
+	"github.com/googleapis/gnostic/OpenAPIv2"
+	"github.com/stretchr/testify/assert"
+
+	"k8s.io/apimachinery/pkg/api/errors"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/runtime/schema"
+	"k8s.io/apimachinery/pkg/version"
+	"k8s.io/client-go/discovery"
+	restclient "k8s.io/client-go/rest"
+	"k8s.io/client-go/rest/fake"
+)
+
+func TestCachedDiscoveryClient_Fresh(t *testing.T) {
+	assert := assert.New(t)
+
+	d, err := ioutil.TempDir("", "")
+	assert.NoError(err)
+	defer os.RemoveAll(d)
+
+	c := fakeDiscoveryClient{}
+	cdc := newCachedDiscoveryClient(&c, d, 60*time.Second)
+	assert.True(cdc.Fresh(), "should be fresh after creation")
+
+	cdc.ServerGroups()
+	assert.True(cdc.Fresh(), "should be fresh after groups call without cache")
+	assert.Equal(c.groupCalls, 1)
+
+	cdc.ServerGroups()
+	assert.True(cdc.Fresh(), "should be fresh after another groups call")
+	assert.Equal(c.groupCalls, 1)
+
+	cdc.ServerResources()
+	assert.True(cdc.Fresh(), "should be fresh after resources call")
+	assert.Equal(c.resourceCalls, 1)
+
+	cdc.ServerResources()
+	assert.True(cdc.Fresh(), "should be fresh after another resources call")
+	assert.Equal(c.resourceCalls, 1)
+
+	cdc = newCachedDiscoveryClient(&c, d, 60*time.Second)
+	cdc.ServerGroups()
+	assert.False(cdc.Fresh(), "should NOT be fresh after recreation with existing groups cache")
+	assert.Equal(c.groupCalls, 1)
+
+	cdc.ServerResources()
+	assert.False(cdc.Fresh(), "should NOT be fresh after recreation with existing resources cache")
+	assert.Equal(c.resourceCalls, 1)
+
+	cdc.Invalidate()
+	assert.True(cdc.Fresh(), "should be fresh after cache invalidation")
+
+	cdc.ServerResources()
+	assert.True(cdc.Fresh(), "should ignore existing resources cache after invalidation")
+	assert.Equal(c.resourceCalls, 2)
+}
+
+func TestNewCachedDiscoveryClient_TTL(t *testing.T) {
+	assert := assert.New(t)
+
+	d, err := ioutil.TempDir("", "")
+	assert.NoError(err)
+	defer os.RemoveAll(d)
+
+	c := fakeDiscoveryClient{}
+	cdc := newCachedDiscoveryClient(&c, d, 1*time.Nanosecond)
+	cdc.ServerGroups()
+	assert.Equal(c.groupCalls, 1)
+
+	time.Sleep(1 * time.Second)
+
+	cdc.ServerGroups()
+	assert.Equal(c.groupCalls, 2)
+}
+
+type fakeDiscoveryClient struct {
+	groupCalls    int
+	resourceCalls int
+	versionCalls  int
+	openAPICalls  int
+
+	serverResourcesHandler func() ([]*metav1.APIResourceList, error)
+}
+
+var _ discovery.DiscoveryInterface = &fakeDiscoveryClient{}
+
+func (c *fakeDiscoveryClient) RESTClient() restclient.Interface {
+	return &fake.RESTClient{}
+}
+
+func (c *fakeDiscoveryClient) ServerGroups() (*metav1.APIGroupList, error) {
+	c.groupCalls = c.groupCalls + 1
+	return c.serverGroups()
+}
+
+func (c *fakeDiscoveryClient) serverGroups() (*metav1.APIGroupList, error) {
+	return &metav1.APIGroupList{
+		Groups: []metav1.APIGroup{
+			{
+				Name: "a",
+				Versions: []metav1.GroupVersionForDiscovery{
+					{
+						GroupVersion: "a/v1",
+						Version:      "v1",
+					},
+				},
+				PreferredVersion: metav1.GroupVersionForDiscovery{
+					GroupVersion: "a/v1",
+					Version:      "v1",
+				},
+			},
+		},
+	}, nil
+}
+
+func (c *fakeDiscoveryClient) ServerResourcesForGroupVersion(groupVersion string) (*metav1.APIResourceList, error) {
+	c.resourceCalls = c.resourceCalls + 1
+	if groupVersion == "a/v1" {
+		return &metav1.APIResourceList{APIResources: []metav1.APIResource{{Name: "widgets", Kind: "Widget"}}}, nil
+	}
+
+	return nil, errors.NewNotFound(schema.GroupResource{}, "")
+}
+
+// Deprecated: use ServerGroupsAndResources instead.
+func (c *fakeDiscoveryClient) ServerResources() ([]*metav1.APIResourceList, error) {
+	_, rs, err := c.ServerGroupsAndResources()
+	return rs, err
+}
+
+func (c *fakeDiscoveryClient) ServerGroupsAndResources() ([]*metav1.APIGroup, []*metav1.APIResourceList, error) {
+	c.resourceCalls = c.resourceCalls + 1
+
+	gs, _ := c.serverGroups()
+	resultGroups := []*metav1.APIGroup{}
+	for i := range gs.Groups {
+		resultGroups = append(resultGroups, &gs.Groups[i])
+	}
+
+	if c.serverResourcesHandler != nil {
+		rs, err := c.serverResourcesHandler()
+		return resultGroups, rs, err
+	}
+	return resultGroups, []*metav1.APIResourceList{}, nil
+}
+
+func (c *fakeDiscoveryClient) ServerPreferredResources() ([]*metav1.APIResourceList, error) {
+	c.resourceCalls = c.resourceCalls + 1
+	return nil, nil
+}
+
+func (c *fakeDiscoveryClient) ServerPreferredNamespacedResources() ([]*metav1.APIResourceList, error) {
+	c.resourceCalls = c.resourceCalls + 1
+	return nil, nil
+}
+
+func (c *fakeDiscoveryClient) ServerVersion() (*version.Info, error) {
+	c.versionCalls = c.versionCalls + 1
+	return &version.Info{}, nil
+}
+
+func (c *fakeDiscoveryClient) OpenAPISchema() (*openapi_v2.Document, error) {
+	c.openAPICalls = c.openAPICalls + 1
+	return &openapi_v2.Document{}, nil
+}