mirror of
https://github.com/prometheus/prometheus.git
synced 2025-11-04 10:21:02 +01:00
0dbae36d36
The main purpose of this is to allow for blacklisting of expensive metrics as a tactical option. It could also find uses for renaming and removing labels from federation.
330 lines
8.9 KiB
Go
330 lines
8.9 KiB
Go
// Copyright 2013 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package retrieval
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import (
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"errors"
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"fmt"
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"net/http"
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"net/http/httptest"
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"net/url"
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"reflect"
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"regexp"
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"strings"
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"testing"
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"time"
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clientmodel "github.com/prometheus/client_golang/model"
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"github.com/prometheus/prometheus/config"
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"github.com/prometheus/prometheus/util/httputil"
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)
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func TestBaseLabels(t *testing.T) {
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target := newTestTarget("example.com:80", 0, clientmodel.LabelSet{"job": "some_job", "foo": "bar"})
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want := clientmodel.LabelSet{
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clientmodel.JobLabel: "some_job",
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clientmodel.InstanceLabel: "example.com:80",
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"foo": "bar",
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}
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got := target.BaseLabels()
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if !reflect.DeepEqual(want, got) {
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t.Errorf("want base labels %v, got %v", want, got)
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}
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}
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func TestTargetScrapeUpdatesState(t *testing.T) {
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testTarget := newTestTarget("bad schema", 0, nil)
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testTarget.scrape(nopAppender{})
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if testTarget.status.Health() != HealthBad {
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t.Errorf("Expected target state %v, actual: %v", HealthBad, testTarget.status.Health())
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}
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}
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func TestTargetScrapeWithFullChannel(t *testing.T) {
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server := httptest.NewServer(
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http.HandlerFunc(
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func(w http.ResponseWriter, r *http.Request) {
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w.Header().Set("Content-Type", `text/plain; version=0.0.4`)
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for i := 0; i < 2*ingestedSamplesCap; i++ {
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w.Write([]byte(
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fmt.Sprintf("test_metric_%d{foo=\"bar\"} 123.456\n", i),
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))
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}
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},
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),
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)
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defer server.Close()
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testTarget := newTestTarget(server.URL, 10*time.Millisecond, clientmodel.LabelSet{"dings": "bums"})
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testTarget.scrape(slowAppender{})
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if testTarget.status.Health() != HealthBad {
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t.Errorf("Expected target state %v, actual: %v", HealthBad, testTarget.status.Health())
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}
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if testTarget.status.LastError() != errIngestChannelFull {
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t.Errorf("Expected target error %q, actual: %q", errIngestChannelFull, testTarget.status.LastError())
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}
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}
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func TestTargetScrapeMetricRelabelConfigs(t *testing.T) {
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server := httptest.NewServer(
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http.HandlerFunc(
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func(w http.ResponseWriter, r *http.Request) {
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w.Header().Set("Content-Type", `text/plain; version=0.0.4`)
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w.Write([]byte("test_metric_drop 0\n"))
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w.Write([]byte("test_metric_relabel 1\n"))
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},
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),
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)
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defer server.Close()
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testTarget := newTestTarget(server.URL, 10*time.Millisecond, clientmodel.LabelSet{})
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testTarget.metricRelabelConfigs = []*config.RelabelConfig{
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{
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SourceLabels: clientmodel.LabelNames{"__name__"},
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Regex: &config.Regexp{*regexp.MustCompile(".*drop.*")},
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Action: config.RelabelDrop,
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},
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{
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SourceLabels: clientmodel.LabelNames{"__name__"},
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Regex: &config.Regexp{*regexp.MustCompile(".*(relabel|up).*")},
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TargetLabel: "foo",
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Replacement: "bar",
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Action: config.RelabelReplace,
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},
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}
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appender := &collectResultAppender{}
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testTarget.scrape(appender)
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// Remove variables part of result.
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for _, sample := range appender.result {
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sample.Timestamp = 0
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sample.Value = 0
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}
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expected := []*clientmodel.Sample{
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{
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Metric: clientmodel.Metric{
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clientmodel.MetricNameLabel: "test_metric_relabel",
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"foo": "bar",
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clientmodel.InstanceLabel: clientmodel.LabelValue(testTarget.url.Host),
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},
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Timestamp: 0,
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Value: 0,
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},
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// The metrics about the scrape are not affected.
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{
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Metric: clientmodel.Metric{
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clientmodel.MetricNameLabel: scrapeHealthMetricName,
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clientmodel.InstanceLabel: clientmodel.LabelValue(testTarget.url.Host),
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},
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Timestamp: 0,
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Value: 0,
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},
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{
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Metric: clientmodel.Metric{
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clientmodel.MetricNameLabel: scrapeDurationMetricName,
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clientmodel.InstanceLabel: clientmodel.LabelValue(testTarget.url.Host),
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},
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Timestamp: 0,
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Value: 0,
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},
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}
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if !appender.result.Equal(expected) {
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t.Fatalf("Expected and actual samples not equal. Expected: %s, actual: %s", expected, appender.result)
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}
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}
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func TestTargetRecordScrapeHealth(t *testing.T) {
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testTarget := newTestTarget("example.url:80", 0, clientmodel.LabelSet{clientmodel.JobLabel: "testjob"})
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now := clientmodel.Now()
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appender := &collectResultAppender{}
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testTarget.status.setLastError(nil)
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recordScrapeHealth(appender, now, testTarget.BaseLabels(), testTarget.status.Health(), 2*time.Second)
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result := appender.result
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if len(result) != 2 {
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t.Fatalf("Expected two samples, got %d", len(result))
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}
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actual := result[0]
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expected := &clientmodel.Sample{
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Metric: clientmodel.Metric{
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clientmodel.MetricNameLabel: scrapeHealthMetricName,
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clientmodel.InstanceLabel: "example.url:80",
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clientmodel.JobLabel: "testjob",
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},
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Timestamp: now,
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Value: 1,
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}
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if !actual.Equal(expected) {
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t.Fatalf("Expected and actual samples not equal. Expected: %v, actual: %v", expected, actual)
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}
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actual = result[1]
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expected = &clientmodel.Sample{
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Metric: clientmodel.Metric{
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clientmodel.MetricNameLabel: scrapeDurationMetricName,
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clientmodel.InstanceLabel: "example.url:80",
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clientmodel.JobLabel: "testjob",
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},
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Timestamp: now,
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Value: 2.0,
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}
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if !actual.Equal(expected) {
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t.Fatalf("Expected and actual samples not equal. Expected: %v, actual: %v", expected, actual)
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}
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}
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func TestTargetScrapeTimeout(t *testing.T) {
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signal := make(chan bool, 1)
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server := httptest.NewServer(
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http.HandlerFunc(
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func(w http.ResponseWriter, r *http.Request) {
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<-signal
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w.Header().Set("Content-Type", `text/plain; version=0.0.4`)
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w.Write([]byte{})
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},
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),
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)
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defer server.Close()
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testTarget := newTestTarget(server.URL, 25*time.Millisecond, clientmodel.LabelSet{})
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appender := nopAppender{}
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// scrape once without timeout
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signal <- true
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if err := testTarget.scrape(appender); err != nil {
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t.Fatal(err)
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}
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// let the deadline lapse
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time.Sleep(30 * time.Millisecond)
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// now scrape again
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signal <- true
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if err := testTarget.scrape(appender); err != nil {
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t.Fatal(err)
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}
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// now timeout
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if err := testTarget.scrape(appender); err == nil {
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t.Fatal("expected scrape to timeout")
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} else {
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signal <- true // let handler continue
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}
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// now scrape again without timeout
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signal <- true
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if err := testTarget.scrape(appender); err != nil {
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t.Fatal(err)
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}
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}
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func TestTargetScrape404(t *testing.T) {
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server := httptest.NewServer(
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http.HandlerFunc(
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func(w http.ResponseWriter, r *http.Request) {
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w.WriteHeader(http.StatusNotFound)
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},
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),
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)
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defer server.Close()
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testTarget := newTestTarget(server.URL, 10*time.Millisecond, clientmodel.LabelSet{})
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appender := nopAppender{}
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want := errors.New("server returned HTTP status 404 Not Found")
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got := testTarget.scrape(appender)
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if got == nil || want.Error() != got.Error() {
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t.Fatalf("want err %q, got %q", want, got)
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}
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}
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func TestTargetRunScraperScrapes(t *testing.T) {
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testTarget := newTestTarget("bad schema", 0, nil)
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go testTarget.RunScraper(nopAppender{})
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// Enough time for a scrape to happen.
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time.Sleep(10 * time.Millisecond)
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if testTarget.status.LastScrape().IsZero() {
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t.Errorf("Scrape hasn't occured.")
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}
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testTarget.StopScraper()
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// Wait for it to take effect.
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time.Sleep(5 * time.Millisecond)
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last := testTarget.status.LastScrape()
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// Enough time for a scrape to happen.
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time.Sleep(10 * time.Millisecond)
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if testTarget.status.LastScrape() != last {
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t.Errorf("Scrape occured after it was stopped.")
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}
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}
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func BenchmarkScrape(b *testing.B) {
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server := httptest.NewServer(
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http.HandlerFunc(
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func(w http.ResponseWriter, r *http.Request) {
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w.Header().Set("Content-Type", `text/plain; version=0.0.4`)
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w.Write([]byte("test_metric{foo=\"bar\"} 123.456\n"))
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},
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),
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)
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defer server.Close()
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testTarget := newTestTarget(server.URL, 100*time.Millisecond, clientmodel.LabelSet{"dings": "bums"})
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appender := nopAppender{}
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b.ResetTimer()
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for i := 0; i < b.N; i++ {
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if err := testTarget.scrape(appender); err != nil {
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b.Fatal(err)
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}
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}
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}
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func newTestTarget(targetURL string, deadline time.Duration, baseLabels clientmodel.LabelSet) *Target {
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t := &Target{
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url: &url.URL{
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Scheme: "http",
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Host: strings.TrimLeft(targetURL, "http://"),
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Path: "/metrics",
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},
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deadline: deadline,
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status: &TargetStatus{},
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scrapeInterval: 1 * time.Millisecond,
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httpClient: httputil.NewDeadlineClient(deadline),
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scraperStopping: make(chan struct{}),
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scraperStopped: make(chan struct{}),
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}
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t.baseLabels = clientmodel.LabelSet{
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clientmodel.InstanceLabel: clientmodel.LabelValue(t.InstanceIdentifier()),
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}
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for baseLabel, baseValue := range baseLabels {
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t.baseLabels[baseLabel] = baseValue
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}
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return t
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}
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