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|
package clusterinfo
import (
"context"
"fmt"
"net/http"
"net/http/httptest"
"net/url"
"os"
"reflect"
"testing"
"time"
"github.com/go-kit/kit/log"
"github.com/blang/semver"
)
const (
nodeName = "test-node-"
clusterName = "test-cluster-1"
clusterUUID = "r1bT9sBrR7S9-CamE41Qqg"
versionNumber = "5.6.9"
buildHash = "877a590"
buildDate = "2018-04-12T16:25:14.838Z"
buildSnapshot = false
luceneVersion = "6.6.1"
tagline = "You Know, for Search"
)
type mockES struct{}
func (mockES) ServeHTTP(w http.ResponseWriter, r *http.Request) {
fmt.Fprintf(w, `{
"name" : "%s",
"cluster_name" : "%s",
"cluster_uuid" : "%s",
"version" : {
"number" : "%s",
"build_hash" : "%s",
"build_date" : "%s",
"build_snapshot" : %t,
"lucene_version" : "%s"
},
"tagline" : "%s"
}`,
nodeName,
clusterName,
clusterUUID,
versionNumber,
buildHash,
buildDate,
buildSnapshot,
luceneVersion,
tagline,
)
}
type mockConsumer struct {
name string
data *Response
ch chan *Response
}
func newMockConsumer(ctx context.Context, name string, t *testing.T) *mockConsumer {
mc := &mockConsumer{
name: name,
ch: make(chan *Response),
}
go func() {
for {
select {
case d := <-mc.ch:
mc.data = d
t.Logf("consumer %s received data from channel: %+v\n", mc, mc.data)
case <-ctx.Done():
return
}
}
}()
return mc
}
func (mc *mockConsumer) String() string {
return mc.name
}
func (mc *mockConsumer) ClusterLabelUpdates() *chan *Response {
return &mc.ch
}
func TestNew(t *testing.T) {
u, err := url.Parse("http://localhost:9200")
if err != nil {
t.Skipf("internal test error: %s", err)
}
r := New(log.NewNopLogger(), http.DefaultClient, u, 0)
if r.url != u {
t.Errorf("new Retriever mal-constructed")
}
}
func TestRetriever_RegisterConsumer(t *testing.T) {
mockES := httptest.NewServer(mockES{})
u, err := url.Parse(mockES.URL)
if err != nil {
t.Fatalf("internal test error: %s", err)
}
retriever := New(log.NewNopLogger(), mockES.Client(), u, 0)
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
consumerNames := []string{"consumer-1", "consumer-2"}
for _, n := range consumerNames {
c := newMockConsumer(ctx, n, t)
if err := retriever.RegisterConsumer(c); err != nil {
t.Errorf("failed to register consumer: %s", err)
}
}
if len(retriever.consumerChannels) != len(consumerNames) {
t.Error("number of registered consumerChannels doesn't match the number of calls to the register func")
}
}
func TestRetriever_fetchAndDecodeClusterInfo(t *testing.T) {
// these override test package globals
versionNumber, _ := semver.Make(versionNumber)
luceneVersion, _ := semver.Make(luceneVersion)
var expected = &Response{
Name: nodeName,
ClusterName: clusterName,
ClusterUUID: clusterUUID,
Version: VersionInfo{
Number: versionNumber,
BuildHash: buildHash,
BuildDate: buildDate,
BuildSnapshot: buildSnapshot,
LuceneVersion: luceneVersion,
},
Tagline: tagline,
}
mockES := httptest.NewServer(mockES{})
u, err := url.Parse(mockES.URL)
if err != nil {
t.Skipf("internal test error: %s", err)
}
retriever := New(log.NewNopLogger(), mockES.Client(), u, 0)
ci, err := retriever.fetchAndDecodeClusterInfo()
if err != nil {
t.Fatalf("failed to retrieve cluster info: %s", err)
}
if !reflect.DeepEqual(ci, expected) {
t.Errorf("unexpected response, want %v, got %v", expected, ci)
}
}
func TestRetriever_Run(t *testing.T) {
// setup mock ES
mockES := httptest.NewServer(mockES{})
u, err := url.Parse(mockES.URL)
if err != nil {
t.Fatalf("internal test error: %s", err)
}
// setup cluster info retriever
retriever := New(log.NewLogfmtLogger(os.Stdout), mockES.Client(), u, 0)
// setup mock consumer
ctx, cancel := context.WithTimeout(context.Background(), 2*time.Second)
defer cancel()
mc := newMockConsumer(ctx, "test-consumer", t)
if err := retriever.RegisterConsumer(mc); err != nil {
t.Fatalf("failed to register consumer: %s", err)
}
// start retriever
retriever.Run(ctx)
// trigger update
retriever.Update()
time.Sleep(20 * time.Millisecond)
// ToDo: check mockConsumers received data
t.Logf("%+v\n", mc.data)
// check for deadlocks
select {
case <-ctx.Done():
if err := ctx.Err(); err == context.DeadlineExceeded {
t.Fatal("context timeout exceeded, caught deadlock")
}
default:
}
}
|
