prometheus/retrieval/target_test.go

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// Copyright 2013 The Prometheus 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 retrieval
import (
"errors"
"fmt"
"net/http"
"net/http/httptest"
"net/url"
"reflect"
"regexp"
"strings"
"testing"
"time"
clientmodel "github.com/prometheus/client_golang/model"
"github.com/prometheus/prometheus/config"
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"github.com/prometheus/prometheus/util/httputil"
)
func TestBaseLabels(t *testing.T) {
target := newTestTarget("example.com:80", 0, clientmodel.LabelSet{"job": "some_job", "foo": "bar"})
want := clientmodel.LabelSet{
clientmodel.JobLabel: "some_job",
clientmodel.InstanceLabel: "example.com:80",
"foo": "bar",
}
got := target.BaseLabels()
if !reflect.DeepEqual(want, got) {
t.Errorf("want base labels %v, got %v", want, got)
}
}
func TestOverwriteLabels(t *testing.T) {
type test struct {
metric string
resultNormal clientmodel.Metric
resultHonor clientmodel.Metric
}
var tests []test
server := httptest.NewServer(
http.HandlerFunc(
func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", `text/plain; version=0.0.4`)
for _, test := range tests {
w.Write([]byte(test.metric))
w.Write([]byte(" 1\n"))
}
},
),
)
defer server.Close()
addr := clientmodel.LabelValue(strings.Split(server.URL, "://")[1])
tests = []test{
{
metric: `foo{}`,
resultNormal: clientmodel.Metric{
clientmodel.MetricNameLabel: "foo",
clientmodel.InstanceLabel: addr,
},
resultHonor: clientmodel.Metric{
clientmodel.MetricNameLabel: "foo",
clientmodel.InstanceLabel: addr,
},
},
{
metric: `foo{instance=""}`,
resultNormal: clientmodel.Metric{
clientmodel.MetricNameLabel: "foo",
clientmodel.InstanceLabel: addr,
},
resultHonor: clientmodel.Metric{
clientmodel.MetricNameLabel: "foo",
},
},
{
metric: `foo{instance="other_instance"}`,
resultNormal: clientmodel.Metric{
clientmodel.MetricNameLabel: "foo",
clientmodel.InstanceLabel: addr,
clientmodel.ExportedLabelPrefix + clientmodel.InstanceLabel: "other_instance",
},
resultHonor: clientmodel.Metric{
clientmodel.MetricNameLabel: "foo",
clientmodel.InstanceLabel: "other_instance",
},
},
}
target := newTestTarget(server.URL, 10*time.Millisecond, nil)
target.honorLabels = false
app := &collectResultAppender{}
if err := target.scrape(app); err != nil {
t.Fatal(err)
}
for i, test := range tests {
if !reflect.DeepEqual(app.result[i].Metric, test.resultNormal) {
t.Errorf("Error comparing %q:\nExpected:\n%s\nGot:\n%s\n", test.metric, test.resultNormal, app.result[i].Metric)
}
}
target.honorLabels = true
app = &collectResultAppender{}
if err := target.scrape(app); err != nil {
t.Fatal(err)
}
for i, test := range tests {
if !reflect.DeepEqual(app.result[i].Metric, test.resultHonor) {
t.Errorf("Error comparing %q:\nExpected:\n%s\nGot:\n%s\n", test.metric, test.resultHonor, app.result[i].Metric)
}
}
}
func TestTargetScrapeUpdatesState(t *testing.T) {
testTarget := newTestTarget("bad schema", 0, nil)
testTarget.scrape(nopAppender{})
if testTarget.status.Health() != HealthBad {
t.Errorf("Expected target state %v, actual: %v", HealthBad, testTarget.status.Health())
}
}
func TestTargetScrapeWithFullChannel(t *testing.T) {
server := httptest.NewServer(
http.HandlerFunc(
func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", `text/plain; version=0.0.4`)
for i := 0; i < 2*ingestedSamplesCap; i++ {
w.Write([]byte(
fmt.Sprintf("test_metric_%d{foo=\"bar\"} 123.456\n", i),
))
}
},
),
)
defer server.Close()
testTarget := newTestTarget(server.URL, 10*time.Millisecond, clientmodel.LabelSet{"dings": "bums"})
testTarget.scrape(slowAppender{})
if testTarget.status.Health() != HealthBad {
t.Errorf("Expected target state %v, actual: %v", HealthBad, testTarget.status.Health())
}
if testTarget.status.LastError() != errIngestChannelFull {
t.Errorf("Expected target error %q, actual: %q", errIngestChannelFull, testTarget.status.LastError())
}
}
func TestTargetScrapeMetricRelabelConfigs(t *testing.T) {
server := httptest.NewServer(
http.HandlerFunc(
func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", `text/plain; version=0.0.4`)
w.Write([]byte("test_metric_drop 0\n"))
w.Write([]byte("test_metric_relabel 1\n"))
},
),
)
defer server.Close()
testTarget := newTestTarget(server.URL, 10*time.Millisecond, clientmodel.LabelSet{})
testTarget.metricRelabelConfigs = []*config.RelabelConfig{
{
SourceLabels: clientmodel.LabelNames{"__name__"},
Regex: &config.Regexp{*regexp.MustCompile(".*drop.*")},
Action: config.RelabelDrop,
},
{
SourceLabels: clientmodel.LabelNames{"__name__"},
Regex: &config.Regexp{*regexp.MustCompile(".*(relabel|up).*")},
TargetLabel: "foo",
Replacement: "bar",
Action: config.RelabelReplace,
},
}
appender := &collectResultAppender{}
testTarget.scrape(appender)
// Remove variables part of result.
for _, sample := range appender.result {
sample.Timestamp = 0
sample.Value = 0
}
expected := []*clientmodel.Sample{
{
Metric: clientmodel.Metric{
clientmodel.MetricNameLabel: "test_metric_relabel",
"foo": "bar",
clientmodel.InstanceLabel: clientmodel.LabelValue(testTarget.url.Host),
},
Timestamp: 0,
Value: 0,
},
// The metrics about the scrape are not affected.
{
Metric: clientmodel.Metric{
clientmodel.MetricNameLabel: scrapeHealthMetricName,
clientmodel.InstanceLabel: clientmodel.LabelValue(testTarget.url.Host),
},
Timestamp: 0,
Value: 0,
},
{
Metric: clientmodel.Metric{
clientmodel.MetricNameLabel: scrapeDurationMetricName,
clientmodel.InstanceLabel: clientmodel.LabelValue(testTarget.url.Host),
},
Timestamp: 0,
Value: 0,
},
}
if !appender.result.Equal(expected) {
t.Fatalf("Expected and actual samples not equal. Expected: %s, actual: %s", expected, appender.result)
}
}
func TestTargetRecordScrapeHealth(t *testing.T) {
testTarget := newTestTarget("example.url:80", 0, clientmodel.LabelSet{clientmodel.JobLabel: "testjob"})
Use custom timestamp type for sample timestamps and related code. So far we've been using Go's native time.Time for anything related to sample timestamps. Since the range of time.Time is much bigger than what we need, this has created two problems: - there could be time.Time values which were out of the range/precision of the time type that we persist to disk, therefore causing incorrectly ordered keys. One bug caused by this was: https://github.com/prometheus/prometheus/issues/367 It would be good to use a timestamp type that's more closely aligned with what the underlying storage supports. - sizeof(time.Time) is 192, while Prometheus should be ok with a single 64-bit Unix timestamp (possibly even a 32-bit one). Since we store samples in large numbers, this seriously affects memory usage. Furthermore, copying/working with the data will be faster if it's smaller. *MEMORY USAGE RESULTS* Initial memory usage comparisons for a running Prometheus with 1 timeseries and 100,000 samples show roughly a 13% decrease in total (VIRT) memory usage. In my tests, this advantage for some reason decreased a bit the more samples the timeseries had (to 5-7% for millions of samples). This I can't fully explain, but perhaps garbage collection issues were involved. *WHEN TO USE THE NEW TIMESTAMP TYPE* The new clientmodel.Timestamp type should be used whenever time calculations are either directly or indirectly related to sample timestamps. For example: - the timestamp of a sample itself - all kinds of watermarks - anything that may become or is compared to a sample timestamp (like the timestamp passed into Target.Scrape()). When to still use time.Time: - for measuring durations/times not related to sample timestamps, like duration telemetry exporting, timers that indicate how frequently to execute some action, etc. *NOTE ON OPERATOR OPTIMIZATION TESTS* We don't use operator optimization code anymore, but it still lives in the code as dead code. It still has tests, but I couldn't get all of them to pass with the new timestamp format. I commented out the failing cases for now, but we should probably remove the dead code soon. I just didn't want to do that in the same change as this. Change-Id: I821787414b0debe85c9fffaeb57abd453727af0f
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now := clientmodel.Now()
appender := &collectResultAppender{}
testTarget.status.setLastError(nil)
recordScrapeHealth(appender, now, testTarget.BaseLabels(), testTarget.status.Health(), 2*time.Second)
result := appender.result
if len(result) != 2 {
t.Fatalf("Expected two samples, got %d", len(result))
}
actual := result[0]
expected := &clientmodel.Sample{
Metric: clientmodel.Metric{
clientmodel.MetricNameLabel: scrapeHealthMetricName,
clientmodel.InstanceLabel: "example.url:80",
clientmodel.JobLabel: "testjob",
},
Timestamp: now,
Value: 1,
}
if !actual.Equal(expected) {
t.Fatalf("Expected and actual samples not equal. Expected: %v, actual: %v", expected, actual)
}
actual = result[1]
expected = &clientmodel.Sample{
Metric: clientmodel.Metric{
clientmodel.MetricNameLabel: scrapeDurationMetricName,
clientmodel.InstanceLabel: "example.url:80",
clientmodel.JobLabel: "testjob",
},
Timestamp: now,
Value: 2.0,
}
if !actual.Equal(expected) {
t.Fatalf("Expected and actual samples not equal. Expected: %v, actual: %v", expected, actual)
}
}
func TestTargetScrapeTimeout(t *testing.T) {
signal := make(chan bool, 1)
server := httptest.NewServer(
http.HandlerFunc(
func(w http.ResponseWriter, r *http.Request) {
<-signal
w.Header().Set("Content-Type", `text/plain; version=0.0.4`)
w.Write([]byte{})
},
),
)
defer server.Close()
testTarget := newTestTarget(server.URL, 25*time.Millisecond, clientmodel.LabelSet{})
appender := nopAppender{}
// scrape once without timeout
signal <- true
if err := testTarget.scrape(appender); err != nil {
t.Fatal(err)
}
// let the deadline lapse
time.Sleep(30 * time.Millisecond)
// now scrape again
signal <- true
if err := testTarget.scrape(appender); err != nil {
t.Fatal(err)
}
// now timeout
if err := testTarget.scrape(appender); err == nil {
t.Fatal("expected scrape to timeout")
} else {
signal <- true // let handler continue
}
// now scrape again without timeout
signal <- true
if err := testTarget.scrape(appender); err != nil {
t.Fatal(err)
}
}
func TestTargetScrape404(t *testing.T) {
server := httptest.NewServer(
http.HandlerFunc(
func(w http.ResponseWriter, r *http.Request) {
w.WriteHeader(http.StatusNotFound)
},
),
)
defer server.Close()
testTarget := newTestTarget(server.URL, 10*time.Millisecond, clientmodel.LabelSet{})
appender := nopAppender{}
want := errors.New("server returned HTTP status 404 Not Found")
got := testTarget.scrape(appender)
if got == nil || want.Error() != got.Error() {
t.Fatalf("want err %q, got %q", want, got)
}
}
func TestTargetRunScraperScrapes(t *testing.T) {
testTarget := newTestTarget("bad schema", 0, nil)
go testTarget.RunScraper(nopAppender{})
// Enough time for a scrape to happen.
time.Sleep(10 * time.Millisecond)
if testTarget.status.LastScrape().IsZero() {
t.Errorf("Scrape hasn't occured.")
}
testTarget.StopScraper()
// Wait for it to take effect.
time.Sleep(5 * time.Millisecond)
last := testTarget.status.LastScrape()
// Enough time for a scrape to happen.
time.Sleep(10 * time.Millisecond)
if testTarget.status.LastScrape() != last {
t.Errorf("Scrape occured after it was stopped.")
}
}
func BenchmarkScrape(b *testing.B) {
server := httptest.NewServer(
http.HandlerFunc(
func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", `text/plain; version=0.0.4`)
w.Write([]byte("test_metric{foo=\"bar\"} 123.456\n"))
},
),
)
defer server.Close()
testTarget := newTestTarget(server.URL, 100*time.Millisecond, clientmodel.LabelSet{"dings": "bums"})
appender := nopAppender{}
b.ResetTimer()
for i := 0; i < b.N; i++ {
if err := testTarget.scrape(appender); err != nil {
b.Fatal(err)
}
}
}
func newTestTarget(targetURL string, deadline time.Duration, baseLabels clientmodel.LabelSet) *Target {
t := &Target{
url: &url.URL{
Scheme: "http",
Host: strings.TrimLeft(targetURL, "http://"),
Path: "/metrics",
},
deadline: deadline,
status: &TargetStatus{},
scrapeInterval: 1 * time.Millisecond,
httpClient: httputil.NewDeadlineClient(deadline),
scraperStopping: make(chan struct{}),
scraperStopped: make(chan struct{}),
}
t.baseLabels = clientmodel.LabelSet{
clientmodel.InstanceLabel: clientmodel.LabelValue(t.InstanceIdentifier()),
}
for baseLabel, baseValue := range baseLabels {
t.baseLabels[baseLabel] = baseValue
}
return t
}