Add "componentstatus" to API for easier cluster health check.

pkg/registry/componentstatus/rest_test.go

@@ -0,0 +1,143 @@
+/*
+Copyright 2015 Google Inc. All rights reserved.
+
+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 componentstatus
+
+import (
+	"bytes"
+	"fmt"
+	"io/ioutil"
+	"net/http"
+	"reflect"
+	"strings"
+	"testing"
+
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/apiserver"
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/fields"
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/labels"
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/util"
+)
+
+type fakeRoundTripper struct {
+	err  error
+	resp *http.Response
+	url  string
+}
+
+func (f *fakeRoundTripper) RoundTrip(req *http.Request) (*http.Response, error) {
+	f.url = req.URL.String()
+	return f.resp, f.err
+}
+
+type testResponse struct {
+	code int
+	data string
+	err  error
+}
+
+func NewTestREST(resp testResponse) *REST {
+	return &REST{
+		GetServersToValidate: func() map[string]apiserver.Server {
+			return map[string]apiserver.Server{
+				"test1": {Addr: "testserver1", Port: 8000, Path: "/healthz"},
+			}
+		},
+		rt: &fakeRoundTripper{
+			err: resp.err,
+			resp: &http.Response{
+				Body:       ioutil.NopCloser(bytes.NewBufferString(resp.data)),
+				StatusCode: resp.code,
+			},
+		},
+	}
+}
+
+func createTestStatus(name string, status api.ConditionStatus, msg string, err string) *api.ComponentStatus {
+	return &api.ComponentStatus{
+		Name: name,
+		Conditions: []api.ComponentCondition{
+			{Type: api.ComponentHealthy, Status: status, Message: msg, Error: err},
+		},
+	}
+}
+
+func TestList_NoError(t *testing.T) {
+	r := NewTestREST(testResponse{code: 200, data: "ok"})
+	got, err := r.List(api.NewContext(), labels.Everything(), fields.Everything())
+	if err != nil {
+		t.Fatalf("Unexpected error: %v", err)
+	}
+	expect := &api.ComponentStatusList{
+		Items: []api.ComponentStatus{*(createTestStatus("test1", api.ConditionTrue, "ok", "nil"))},
+	}
+	if e, a := expect, got; !reflect.DeepEqual(e, a) {
+		t.Errorf("Got unexpected object. Diff: %s", util.ObjectDiff(e, a))
+	}
+}
+
+func TestList_FailedCheck(t *testing.T) {
+	r := NewTestREST(testResponse{code: 500, data: ""})
+	got, err := r.List(api.NewContext(), labels.Everything(), fields.Everything())
+	if err != nil {
+		t.Fatalf("Unexpected error: %v", err)
+	}
+	expect := &api.ComponentStatusList{
+		Items: []api.ComponentStatus{
+			*(createTestStatus("test1", api.ConditionFalse, "", "unhealthy http status code: 500 ()"))},
+	}
+	if e, a := expect, got; !reflect.DeepEqual(e, a) {
+		t.Errorf("Got unexpected object. Diff: %s", util.ObjectDiff(e, a))
+	}
+}
+
+func TestList_UnknownError(t *testing.T) {
+	r := NewTestREST(testResponse{code: 500, data: "", err: fmt.Errorf("fizzbuzz error")})
+	got, err := r.List(api.NewContext(), labels.Everything(), fields.Everything())
+	if err != nil {
+		t.Fatalf("Unexpected error: %v", err)
+	}
+	expect := &api.ComponentStatusList{
+		Items: []api.ComponentStatus{
+			*(createTestStatus("test1", api.ConditionUnknown, "", "Get http://testserver1:8000/healthz: fizzbuzz error"))},
+	}
+	if e, a := expect, got; !reflect.DeepEqual(e, a) {
+		t.Errorf("Got unexpected object. Diff: %s", util.ObjectDiff(e, a))
+	}
+}
+
+func TestGet_NoError(t *testing.T) {
+	r := NewTestREST(testResponse{code: 200, data: "ok"})
+	got, err := r.Get(api.NewContext(), "test1")
+	if err != nil {
+		t.Fatalf("Unexpected error: %v", err)
+	}
+	expect := createTestStatus("test1", api.ConditionTrue, "ok", "nil")
+	if e, a := expect, got; !reflect.DeepEqual(e, a) {
+		t.Errorf("Got unexpected object. Diff: %s", util.ObjectDiff(e, a))
+	}
+}
+
+func TestGet_BadName(t *testing.T) {
+	r := NewTestREST(testResponse{code: 200, data: "ok"})
+	_, err := r.Get(api.NewContext(), "invalidname")
+	if err == nil {
+		t.Fatalf("Expected error, but did not get one")
+	}
+	if !strings.Contains(err.Error(), "Component not found: invalidname") {
+		t.Fatalf("Got unexpected error: %v", err)
+	}
+}