1/*
2Copyright 2015 The Kubernetes Authors.
3
4Licensed under the Apache License, Version 2.0 (the "License");
5you may not use this file except in compliance with the License.
6You may obtain a copy of the License at
7
8    http://www.apache.org/licenses/LICENSE-2.0
9
10Unless required by applicable law or agreed to in writing, software
11distributed under the License is distributed on an "AS IS" BASIS,
12WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13See the License for the specific language governing permissions and
14limitations under the License.
15*/
16
17package discovery_test
18
19import (
20	"bytes"
21	"encoding/json"
22	"errors"
23	"io"
24	"io/ioutil"
25	"net/http"
26	"strings"
27	"testing"
28
29	"k8s.io/api/core/v1"
30	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
31	"k8s.io/apimachinery/pkg/runtime"
32	"k8s.io/apimachinery/pkg/runtime/schema"
33	"k8s.io/apimachinery/pkg/util/sets"
34	"k8s.io/client-go/discovery"
35	"k8s.io/client-go/kubernetes/scheme"
36	restclient "k8s.io/client-go/rest"
37	"k8s.io/client-go/rest/fake"
38)
39
40func objBody(object interface{}) io.ReadCloser {
41	output, err := json.MarshalIndent(object, "", "")
42	if err != nil {
43		panic(err)
44	}
45	return ioutil.NopCloser(bytes.NewReader([]byte(output)))
46}
47
48func TestServerSupportsVersion(t *testing.T) {
49	tests := []struct {
50		name            string
51		requiredVersion schema.GroupVersion
52		serverVersions  []string
53		expectErr       func(err error) bool
54		sendErr         error
55		statusCode      int
56	}{
57		{
58			name:            "explicit version supported",
59			requiredVersion: schema.GroupVersion{Version: "v1"},
60			serverVersions:  []string{"/version1", v1.SchemeGroupVersion.String()},
61			statusCode:      http.StatusOK,
62		},
63		{
64			name:            "explicit version not supported on server",
65			requiredVersion: schema.GroupVersion{Version: "v1"},
66			serverVersions:  []string{"version1"},
67			expectErr:       func(err error) bool { return strings.Contains(err.Error(), `server does not support API version "v1"`) },
68			statusCode:      http.StatusOK,
69		},
70		{
71			name:           "connection refused error",
72			serverVersions: []string{"version1"},
73			sendErr:        errors.New("connection refused"),
74			expectErr:      func(err error) bool { return strings.Contains(err.Error(), "connection refused") },
75			statusCode:     http.StatusOK,
76		},
77		{
78			name:            "discovery fails due to 404 Not Found errors and thus serverVersions is empty, use requested GroupVersion",
79			requiredVersion: schema.GroupVersion{Version: "version1"},
80			statusCode:      http.StatusNotFound,
81		},
82	}
83
84	for _, test := range tests {
85		fakeClient := &fake.RESTClient{
86			NegotiatedSerializer: scheme.Codecs,
87			Resp: &http.Response{
88				StatusCode: test.statusCode,
89				Body:       objBody(&metav1.APIVersions{Versions: test.serverVersions}),
90			},
91			Client: fake.CreateHTTPClient(func(req *http.Request) (*http.Response, error) {
92				if test.sendErr != nil {
93					return nil, test.sendErr
94				}
95				header := http.Header{}
96				header.Set("Content-Type", runtime.ContentTypeJSON)
97				return &http.Response{StatusCode: test.statusCode, Header: header, Body: objBody(&metav1.APIVersions{Versions: test.serverVersions})}, nil
98			}),
99		}
100		c := discovery.NewDiscoveryClientForConfigOrDie(&restclient.Config{})
101		c.RESTClient().(*restclient.RESTClient).Client = fakeClient.Client
102		err := discovery.ServerSupportsVersion(c, test.requiredVersion)
103		if err == nil && test.expectErr != nil {
104			t.Errorf("expected error, got nil for [%s].", test.name)
105		}
106		if err != nil {
107			if test.expectErr == nil || !test.expectErr(err) {
108				t.Errorf("unexpected error for [%s]: %v.", test.name, err)
109			}
110			continue
111		}
112	}
113}
114
115func TestFilteredBy(t *testing.T) {
116	all := discovery.ResourcePredicateFunc(func(gv string, r *metav1.APIResource) bool {
117		return true
118	})
119	none := discovery.ResourcePredicateFunc(func(gv string, r *metav1.APIResource) bool {
120		return false
121	})
122	onlyV2 := discovery.ResourcePredicateFunc(func(gv string, r *metav1.APIResource) bool {
123		return strings.HasSuffix(gv, "/v2") || gv == "v2"
124	})
125	onlyBar := discovery.ResourcePredicateFunc(func(gv string, r *metav1.APIResource) bool {
126		return r.Kind == "Bar"
127	})
128
129	foo := []*metav1.APIResourceList{
130		{
131			GroupVersion: "foo/v1",
132			APIResources: []metav1.APIResource{
133				{Name: "bar", Kind: "Bar"},
134				{Name: "test", Kind: "Test"},
135			},
136		},
137		{
138			GroupVersion: "foo/v2",
139			APIResources: []metav1.APIResource{
140				{Name: "bar", Kind: "Bar"},
141				{Name: "test", Kind: "Test"},
142			},
143		},
144		{
145			GroupVersion: "foo/v3",
146			APIResources: []metav1.APIResource{},
147		},
148	}
149
150	tests := []struct {
151		input             []*metav1.APIResourceList
152		pred              discovery.ResourcePredicate
153		expectedResources []string
154	}{
155		{nil, all, []string{}},
156		{[]*metav1.APIResourceList{
157			{GroupVersion: "foo/v1"},
158		}, all, []string{}},
159		{foo, all, []string{"foo/v1.bar", "foo/v1.test", "foo/v2.bar", "foo/v2.test"}},
160		{foo, onlyV2, []string{"foo/v2.bar", "foo/v2.test"}},
161		{foo, onlyBar, []string{"foo/v1.bar", "foo/v2.bar"}},
162		{foo, none, []string{}},
163	}
164	for i, test := range tests {
165		filtered := discovery.FilteredBy(test.pred, test.input)
166
167		if expected, got := sets.NewString(test.expectedResources...), sets.NewString(stringify(filtered)...); !expected.Equal(got) {
168			t.Errorf("[%d] unexpected group versions: expected=%v, got=%v", i, test.expectedResources, stringify(filtered))
169		}
170	}
171}
172
173func stringify(rls []*metav1.APIResourceList) []string {
174	result := []string{}
175	for _, rl := range rls {
176		for _, r := range rl.APIResources {
177			result = append(result, rl.GroupVersion+"."+r.Name)
178		}
179		if len(rl.APIResources) == 0 {
180			result = append(result, rl.GroupVersion)
181		}
182	}
183	return result
184}
185