statsd_exporter/pkg/exporter/exporter_test.go
akartasov b60989291b
feat: enable more linters and fix warnings (#364)
Signed-off-by: akartasov <agneum@gmail.com>
2021-10-24 21:27:31 +07:00

1102 lines
29 KiB
Go

// 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 exporter
import (
"fmt"
"net"
"testing"
"time"
"github.com/go-kit/log"
"github.com/prometheus/client_golang/prometheus"
dto "github.com/prometheus/client_model/go"
"github.com/prometheus/statsd_exporter/pkg/clock"
"github.com/prometheus/statsd_exporter/pkg/event"
"github.com/prometheus/statsd_exporter/pkg/line"
"github.com/prometheus/statsd_exporter/pkg/listener"
"github.com/prometheus/statsd_exporter/pkg/mapper"
"github.com/prometheus/statsd_exporter/pkg/registry"
)
var (
eventStats = prometheus.NewCounterVec(
prometheus.CounterOpts{
Name: "statsd_exporter_events_total",
Help: "The total number of StatsD events seen.",
},
[]string{"type"},
)
eventsFlushed = prometheus.NewCounter(
prometheus.CounterOpts{
Name: "statsd_exporter_event_queue_flushed_total",
Help: "Number of times events were flushed to exporter",
},
)
eventsUnmapped = prometheus.NewCounter(
prometheus.CounterOpts{
Name: "statsd_exporter_events_unmapped_total",
Help: "The total number of StatsD events no mapping was found for.",
})
udpPackets = prometheus.NewCounter(
prometheus.CounterOpts{
Name: "statsd_exporter_udp_packets_total",
Help: "The total number of StatsD packets received over UDP.",
},
)
tcpConnections = prometheus.NewCounter(
prometheus.CounterOpts{
Name: "statsd_exporter_tcp_connections_total",
Help: "The total number of TCP connections handled.",
},
)
tcpErrors = prometheus.NewCounter(
prometheus.CounterOpts{
Name: "statsd_exporter_tcp_connection_errors_total",
Help: "The number of errors encountered reading from TCP.",
},
)
tcpLineTooLong = prometheus.NewCounter(
prometheus.CounterOpts{
Name: "statsd_exporter_tcp_too_long_lines_total",
Help: "The number of lines discarded due to being too long.",
},
)
linesReceived = prometheus.NewCounter(
prometheus.CounterOpts{
Name: "statsd_exporter_lines_total",
Help: "The total number of StatsD lines received.",
},
)
samplesReceived = prometheus.NewCounter(
prometheus.CounterOpts{
Name: "statsd_exporter_samples_total",
Help: "The total number of StatsD samples received.",
},
)
sampleErrors = prometheus.NewCounterVec(
prometheus.CounterOpts{
Name: "statsd_exporter_sample_errors_total",
Help: "The total number of errors parsing StatsD samples.",
},
[]string{"reason"},
)
tagsReceived = prometheus.NewCounter(
prometheus.CounterOpts{
Name: "statsd_exporter_tags_total",
Help: "The total number of DogStatsD tags processed.",
},
)
tagErrors = prometheus.NewCounter(
prometheus.CounterOpts{
Name: "statsd_exporter_tag_errors_total",
Help: "The number of errors parsing DogStatsD tags.",
},
)
conflictingEventStats = prometheus.NewCounterVec(
prometheus.CounterOpts{
Name: "statsd_exporter_events_conflict_total",
Help: "The total number of StatsD events with conflicting names.",
},
[]string{"type"},
)
errorEventStats = prometheus.NewCounterVec(
prometheus.CounterOpts{
Name: "statsd_exporter_events_error_total",
Help: "The total number of StatsD events discarded due to errors.",
},
[]string{"reason"},
)
eventsActions = prometheus.NewCounterVec(
prometheus.CounterOpts{
Name: "statsd_exporter_events_actions_total",
Help: "The total number of StatsD events by action.",
},
[]string{"action"},
)
metricsCount = prometheus.NewGaugeVec(
prometheus.GaugeOpts{
Name: "statsd_exporter_metrics_total",
Help: "The total number of metrics.",
},
[]string{"type"},
)
)
// TestNegativeCounter validates when we send a negative
// number to a counter that we no longer panic the Exporter Listener.
func TestNegativeCounter(t *testing.T) {
defer func() {
if e := recover(); e != nil {
err := e.(error)
if err.Error() == "counter cannot decrease in value" {
t.Fatalf("Counter was negative and causes a panic.")
} else {
t.Fatalf("Unknown panic and error: %q", err.Error())
}
}
}()
events := make(chan event.Events)
go func() {
c := event.Events{
&event.CounterEvent{
CMetricName: "foo",
CValue: -1,
},
}
events <- c
close(events)
}()
errorCounter := errorEventStats.WithLabelValues("illegal_negative_counter")
prev := getTelemetryCounterValue(errorCounter)
testMapper := mapper.MetricMapper{}
ex := NewExporter(prometheus.DefaultRegisterer, &testMapper, log.NewNopLogger(), eventsActions, eventsUnmapped, errorEventStats, eventStats, conflictingEventStats, metricsCount)
ex.Listen(events)
updated := getTelemetryCounterValue(errorCounter)
if updated-prev != 1 {
t.Fatal("Illegal negative counter error not counted")
}
}
// TestInconsistentLabelSets validates that the exporter will register
// and record metrics with the same metric name but inconsistent label
// sets e.g foo{a="1"} and foo{b="1"}
func TestInconsistentLabelSets(t *testing.T) {
firstLabelSet := make(map[string]string)
secondLabelSet := make(map[string]string)
metricNames := [4]string{"counter_test", "gauge_test", "histogram_test", "summary_test"}
firstLabelSet["foo"] = "1"
secondLabelSet["foo"] = "1"
secondLabelSet["bar"] = "2"
events := make(chan event.Events)
go func() {
c := event.Events{
&event.CounterEvent{
CMetricName: "counter_test",
CValue: 1,
CLabels: firstLabelSet,
},
&event.CounterEvent{
CMetricName: "counter_test",
CValue: 1,
CLabels: secondLabelSet,
},
&event.GaugeEvent{
GMetricName: "gauge_test",
GValue: 1,
GLabels: firstLabelSet,
},
&event.GaugeEvent{
GMetricName: "gauge_test",
GValue: 1,
GLabels: secondLabelSet,
},
&event.ObserverEvent{
OMetricName: "histogram.test",
OValue: 1,
OLabels: firstLabelSet,
},
&event.ObserverEvent{
OMetricName: "histogram.test",
OValue: 1,
OLabels: secondLabelSet,
},
&event.ObserverEvent{
OMetricName: "summary_test",
OValue: 1,
OLabels: firstLabelSet,
},
&event.ObserverEvent{
OMetricName: "summary_test",
OValue: 1,
OLabels: secondLabelSet,
},
}
events <- c
close(events)
}()
config := `
mappings:
- match: histogram.test
timer_type: histogram
name: "histogram_test"
`
testMapper := &mapper.MetricMapper{}
err := testMapper.InitFromYAMLString(config)
if err != nil {
t.Fatalf("Config load error: %s %s", config, err)
}
ex := NewExporter(prometheus.DefaultRegisterer, testMapper, log.NewNopLogger(), eventsActions, eventsUnmapped, errorEventStats, eventStats, conflictingEventStats, metricsCount)
ex.Listen(events)
metrics, err := prometheus.DefaultGatherer.Gather()
if err != nil {
t.Fatalf("Cannot gather from DefaultGatherer: %v", err)
}
for _, metricName := range metricNames {
firstMetric := getFloat64(metrics, metricName, firstLabelSet)
secondMetric := getFloat64(metrics, metricName, secondLabelSet)
if firstMetric == nil {
t.Fatalf("Could not find time series with first label set for metric: %s", metricName)
}
if secondMetric == nil {
t.Fatalf("Could not find time series with second label set for metric: %s", metricName)
}
}
}
// TestLabelParsing verifies that labels getting parsed out of metric
// names are being properly created.
func TestLabelParsing(t *testing.T) {
codes := [2]string{"200", "300"}
events := make(chan event.Events)
go func() {
c := event.Events{
&event.CounterEvent{
CMetricName: "counter.test.200",
CValue: 1,
CLabels: make(map[string]string),
},
&event.CounterEvent{
CMetricName: "counter.test.300",
CValue: 1,
CLabels: make(map[string]string),
},
}
events <- c
close(events)
}()
config := `
mappings:
- match: counter.test.*
name: "counter_test"
labels:
code: $1
`
testMapper := &mapper.MetricMapper{}
err := testMapper.InitFromYAMLString(config)
if err != nil {
t.Fatalf("Config load error: %s %s", config, err)
}
ex := NewExporter(prometheus.DefaultRegisterer, testMapper, log.NewNopLogger(), eventsActions, eventsUnmapped, errorEventStats, eventStats, conflictingEventStats, metricsCount)
ex.Listen(events)
metrics, err := prometheus.DefaultGatherer.Gather()
if err != nil {
t.Fatalf("Cannot gather from DefaultGatherer: %v", err)
}
labels := make(map[string]string)
for _, code := range codes {
labels["code"] = code
if getFloat64(metrics, "counter_test", labels) == nil {
t.Fatalf("Could not find metrics for counter_test code %s", code)
}
}
}
// TestConflictingMetrics validates that the exporter will not register metrics
// of different types that have overlapping names.
func TestConflictingMetrics(t *testing.T) {
scenarios := []struct {
name string
expected []float64
in event.Events
}{
{
name: "counter vs gauge",
expected: []float64{1},
in: event.Events{
&event.CounterEvent{
CMetricName: "cvg_test",
CValue: 1,
},
&event.GaugeEvent{
GMetricName: "cvg_test",
GValue: 2,
},
},
},
{
name: "counter vs gauge with different labels",
expected: []float64{1, 2},
in: event.Events{
&event.CounterEvent{
CMetricName: "cvgl_test",
CValue: 1,
CLabels: map[string]string{"tag": "1"},
},
&event.CounterEvent{
CMetricName: "cvgl_test",
CValue: 2,
CLabels: map[string]string{"tag": "2"},
},
&event.GaugeEvent{
GMetricName: "cvgl_test",
GValue: 3,
GLabels: map[string]string{"tag": "1"},
},
},
},
{
name: "counter vs gauge with same labels",
expected: []float64{3},
in: event.Events{
&event.CounterEvent{
CMetricName: "cvgsl_test",
CValue: 1,
CLabels: map[string]string{"tag": "1"},
},
&event.CounterEvent{
CMetricName: "cvgsl_test",
CValue: 2,
CLabels: map[string]string{"tag": "1"},
},
&event.GaugeEvent{
GMetricName: "cvgsl_test",
GValue: 3,
GLabels: map[string]string{"tag": "1"},
},
},
},
{
name: "gauge vs counter",
expected: []float64{2},
in: event.Events{
&event.GaugeEvent{
GMetricName: "gvc_test",
GValue: 2,
},
&event.CounterEvent{
CMetricName: "gvc_test",
CValue: 1,
},
},
},
{
name: "counter vs histogram",
expected: []float64{1},
in: event.Events{
&event.CounterEvent{
CMetricName: "histogram_test1",
CValue: 1,
},
&event.ObserverEvent{
OMetricName: "histogram.test1",
OValue: 2,
},
},
},
{
name: "counter vs histogram sum",
expected: []float64{1},
in: event.Events{
&event.CounterEvent{
CMetricName: "histogram_test1_sum",
CValue: 1,
},
&event.ObserverEvent{
OMetricName: "histogram.test1",
OValue: 2,
},
},
},
{
name: "counter vs histogram count",
expected: []float64{1},
in: event.Events{
&event.CounterEvent{
CMetricName: "histogram_test2_count",
CValue: 1,
},
&event.ObserverEvent{
OMetricName: "histogram.test2",
OValue: 2,
},
},
},
{
name: "counter vs histogram bucket",
expected: []float64{1},
in: event.Events{
&event.CounterEvent{
CMetricName: "histogram_test3_bucket",
CValue: 1,
},
&event.ObserverEvent{
OMetricName: "histogram.test3",
OValue: 2,
},
},
},
{
name: "counter vs summary quantile",
expected: []float64{1},
in: event.Events{
&event.CounterEvent{
CMetricName: "cvsq_test",
CValue: 1,
},
&event.ObserverEvent{
OMetricName: "cvsq_test",
OValue: 2,
},
},
},
{
name: "counter vs summary count",
expected: []float64{1},
in: event.Events{
&event.CounterEvent{
CMetricName: "cvsc_count",
CValue: 1,
},
&event.ObserverEvent{
OMetricName: "cvsc",
OValue: 2,
},
},
},
{
name: "counter vs summary sum",
expected: []float64{1},
in: event.Events{
&event.CounterEvent{
CMetricName: "cvss_sum",
CValue: 1,
},
&event.ObserverEvent{
OMetricName: "cvss",
OValue: 2,
},
},
},
}
config := `
mappings:
- match: histogram.*
timer_type: histogram
name: "histogram_${1}"
`
for _, s := range scenarios {
t.Run(s.name, func(t *testing.T) {
testMapper := &mapper.MetricMapper{}
err := testMapper.InitFromYAMLString(config)
if err != nil {
t.Fatalf("Config load error: %s %s", config, err)
}
events := make(chan event.Events)
go func() {
events <- s.in
close(events)
}()
ex := NewExporter(prometheus.DefaultRegisterer, testMapper, log.NewNopLogger(), eventsActions, eventsUnmapped, errorEventStats, eventStats, conflictingEventStats, metricsCount)
ex.Listen(events)
metrics, err := prometheus.DefaultGatherer.Gather()
if err != nil {
t.Fatalf("Cannot gather from DefaultGatherer: %v", err)
}
for i, e := range s.expected {
mn := s.in[i].MetricName()
m := getFloat64(metrics, mn, s.in[i].Labels())
if m == nil {
t.Fatalf("Could not find time series with metric name '%v'", mn)
}
if *m != e {
t.Fatalf("Expected to get %v, but got %v instead", e, *m)
}
}
})
}
}
// TestEmptyStringMetric validates when a metric name ends up
// being the empty string after applying the match replacements
// tha we don't panic the Exporter Listener.
func TestEmptyStringMetric(t *testing.T) {
events := make(chan event.Events)
go func() {
c := event.Events{
&event.CounterEvent{
CMetricName: "foo_bar",
CValue: 1,
},
}
events <- c
close(events)
}()
config := `
mappings:
- match: .*_bar
match_type: regex
name: "${1}"
`
testMapper := &mapper.MetricMapper{}
err := testMapper.InitFromYAMLString(config)
if err != nil {
t.Fatalf("Config load error: %s %s", config, err)
}
errorCounter := errorEventStats.WithLabelValues("empty_metric_name")
prev := getTelemetryCounterValue(errorCounter)
ex := NewExporter(prometheus.DefaultRegisterer, testMapper, log.NewNopLogger(), eventsActions, eventsUnmapped, errorEventStats, eventStats, conflictingEventStats, metricsCount)
ex.Listen(events)
updated := getTelemetryCounterValue(errorCounter)
if updated-prev != 1 {
t.Fatal("Empty metric name error event not counted")
}
}
// TestInvalidUtf8InDatadogTagValue validates robustness of exporter listener
// against datadog tags with invalid tag values.
// It sends the same tags first with a valid value, then with an invalid one.
// The exporter should not panic, but drop the invalid event
func TestInvalidUtf8InDatadogTagValue(t *testing.T) {
defer func() {
if e := recover(); e != nil {
err := e.(error)
t.Fatalf("Exporter listener should not panic on bad utf8: %q", err.Error())
}
}()
events := make(chan event.Events)
ueh := &event.UnbufferedEventHandler{C: events}
parser := line.NewParser()
parser.EnableDogstatsdParsing()
parser.EnableInfluxdbParsing()
parser.EnableLibratoParsing()
parser.EnableSignalFXParsing()
go func() {
for _, l := range []statsDPacketHandler{&listener.StatsDUDPListener{
Conn: nil,
EventHandler: nil,
Logger: log.NewNopLogger(),
LineParser: parser,
UDPPackets: udpPackets,
LinesReceived: linesReceived,
EventsFlushed: eventsFlushed,
SampleErrors: *sampleErrors,
SamplesReceived: samplesReceived,
TagErrors: tagErrors,
TagsReceived: tagsReceived,
}, &mockStatsDTCPListener{listener.StatsDTCPListener{
Conn: nil,
EventHandler: nil,
Logger: log.NewNopLogger(),
LineParser: parser,
LinesReceived: linesReceived,
EventsFlushed: eventsFlushed,
SampleErrors: *sampleErrors,
SamplesReceived: samplesReceived,
TagErrors: tagErrors,
TagsReceived: tagsReceived,
TCPConnections: tcpConnections,
TCPErrors: tcpErrors,
TCPLineTooLong: tcpLineTooLong,
}, log.NewNopLogger()}} {
l.SetEventHandler(ueh)
l.HandlePacket([]byte("bar:200|c|#tag:value\nbar:200|c|#tag:\xc3\x28invalid"))
}
close(events)
}()
testMapper := mapper.MetricMapper{}
ex := NewExporter(prometheus.DefaultRegisterer, &testMapper, log.NewNopLogger(), eventsActions, eventsUnmapped, errorEventStats, eventStats, conflictingEventStats, metricsCount)
ex.Listen(events)
}
// In the case of someone starting the statsd exporter with no mapping file specified
// which is valid, we want to make sure that the default quantile metrics are generated
// as well as the sum/count metrics
func TestSummaryWithQuantilesEmptyMapping(t *testing.T) {
// Start exporter with a synchronous channel
events := make(chan event.Events)
go func() {
testMapper := mapper.MetricMapper{}
ex := NewExporter(prometheus.DefaultRegisterer, &testMapper, log.NewNopLogger(), eventsActions, eventsUnmapped, errorEventStats, eventStats, conflictingEventStats, metricsCount)
ex.Listen(events)
}()
name := "default_foo"
c := event.Events{
&event.ObserverEvent{
OMetricName: name,
OValue: 300,
},
}
events <- c
events <- event.Events{}
close(events)
metrics, err := prometheus.DefaultGatherer.Gather()
if err != nil {
t.Fatal("Gather should not fail: ", err)
}
var metricFamily *dto.MetricFamily
for _, m := range metrics {
if *m.Name == name {
metricFamily = m
break
}
}
if metricFamily == nil {
t.Fatal("Metric could not be found")
}
quantiles := metricFamily.Metric[0].Summary.Quantile
if len(quantiles) == 0 {
t.Fatal("Summary has no quantiles available")
}
}
func TestHistogramUnits(t *testing.T) {
// Start exporter with a synchronous channel
events := make(chan event.Events)
go func() {
testMapper := mapper.MetricMapper{}
ex := NewExporter(prometheus.DefaultRegisterer, &testMapper, log.NewNopLogger(), eventsActions, eventsUnmapped, errorEventStats, eventStats, conflictingEventStats, metricsCount)
ex.Mapper.Defaults.ObserverType = mapper.ObserverTypeHistogram
ex.Listen(events)
}()
// Synchronously send a statsd event to wait for handleEvent execution.
// Then close events channel to stop a listener.
name := "foo"
c := event.Events{
&event.ObserverEvent{
OMetricName: name,
OValue: .300,
},
}
events <- c
events <- event.Events{}
close(events)
// Check histogram value
metrics, err := prometheus.DefaultGatherer.Gather()
if err != nil {
t.Fatalf("Cannot gather from DefaultGatherer: %v", err)
}
value := getFloat64(metrics, name, prometheus.Labels{})
if value == nil {
t.Fatal("Histogram value should not be nil")
}
if *value != .300 {
t.Fatalf("Received unexpected value for histogram observation %f != .300", *value)
}
}
func TestCounterIncrement(t *testing.T) {
// Start exporter with a synchronous channel
events := make(chan event.Events)
go func() {
testMapper := mapper.MetricMapper{}
ex := NewExporter(prometheus.DefaultRegisterer, &testMapper, log.NewNopLogger(), eventsActions, eventsUnmapped, errorEventStats, eventStats, conflictingEventStats, metricsCount)
ex.Listen(events)
}()
// Synchronously send a statsd event to wait for handleEvent execution.
// Then close events channel to stop a listener.
name := "foo_counter"
labels := map[string]string{
"foo": "bar",
}
c := event.Events{
&event.CounterEvent{
CMetricName: name,
CValue: 1,
CLabels: labels,
},
&event.CounterEvent{
CMetricName: name,
CValue: 1,
CLabels: labels,
},
}
events <- c
// Push empty event so that we block until the first event is consumed.
events <- event.Events{}
close(events)
// Check histogram value
metrics, err := prometheus.DefaultGatherer.Gather()
if err != nil {
t.Fatalf("Cannot gather from DefaultGatherer: %v", err)
}
value := getFloat64(metrics, name, labels)
if value == nil {
t.Fatal("Counter value should not be nil")
}
if *value != 2 {
t.Fatalf("Counter wasn't incremented properly")
}
}
type statsDPacketHandler interface {
HandlePacket(packet []byte)
SetEventHandler(eh event.EventHandler)
}
type mockStatsDTCPListener struct {
listener.StatsDTCPListener
log.Logger
}
func (ml *mockStatsDTCPListener) HandlePacket(packet []byte) {
// Forcing IPv4 because the TravisCI build environment does not have IPv6
// addresses.
lc, err := net.ListenTCP("tcp4", nil)
if err != nil {
panic(fmt.Sprintf("mockStatsDTCPListener: listen failed: %v", err))
}
defer lc.Close()
go func() {
cc, err := net.DialTCP("tcp", nil, lc.Addr().(*net.TCPAddr))
if err != nil {
panic(fmt.Sprintf("mockStatsDTCPListener: dial failed: %v", err))
}
defer cc.Close()
n, err := cc.Write(packet)
if err != nil || n != len(packet) {
panic(fmt.Sprintf("mockStatsDTCPListener: write failed: %v,%d", err, n))
}
}()
sc, err := lc.AcceptTCP()
if err != nil {
panic(fmt.Sprintf("mockStatsDTCPListener: accept failed: %v", err))
}
ml.HandleConn(sc)
}
// TestTtlExpiration validates expiration of time series.
// foobar metric without mapping should expire with default ttl of 1s
// bazqux metric should expire with ttl of 2s
func TestTtlExpiration(t *testing.T) {
// Mock a time.NewTicker
tickerCh := make(chan time.Time)
clock.ClockInstance = &clock.Clock{
TickerCh: tickerCh,
}
config := `
defaults:
ttl: 1s
mappings:
- match: bazqux.*
name: bazqux
ttl: 2s
`
// Create mapper from config and start an Exporter with a synchronous channel
testMapper := &mapper.MetricMapper{}
err := testMapper.InitFromYAMLString(config)
if err != nil {
t.Fatalf("Config load error: %s %s", config, err)
}
events := make(chan event.Events)
defer close(events)
go func() {
ex := NewExporter(prometheus.DefaultRegisterer, testMapper, log.NewNopLogger(), eventsActions, eventsUnmapped, errorEventStats, eventStats, conflictingEventStats, metricsCount)
ex.Listen(events)
}()
ev := event.Events{
// event with default ttl = 1s
&event.GaugeEvent{
GMetricName: "foobar",
GValue: 200,
},
// event with ttl = 2s from a mapping
&event.ObserverEvent{
OMetricName: "bazqux.main",
OValue: 42,
},
}
var metrics []*dto.MetricFamily
var foobarValue *float64
var bazquxValue *float64
// Step 1. Send events with statsd metrics.
// Send empty Events to wait for events are handled.
// saveLabelValues will use fake instant as a lastRegisteredAt time.
clock.ClockInstance.Instant = time.Unix(0, 0)
events <- ev
events <- event.Events{}
// Check values
metrics, err = prometheus.DefaultGatherer.Gather()
if err != nil {
t.Fatal("Gather should not fail")
}
foobarValue = getFloat64(metrics, "foobar", prometheus.Labels{})
bazquxValue = getFloat64(metrics, "bazqux", prometheus.Labels{})
if foobarValue == nil || bazquxValue == nil {
t.Fatalf("Gauge `foobar` and Summary `bazqux` should be gathered")
}
if *foobarValue != 200 {
t.Fatalf("Gauge `foobar` observation %f is not expected. Should be 200", *foobarValue)
}
if *bazquxValue != 42 {
t.Fatalf("Summary `bazqux` observation %f is not expected. Should be 42", *bazquxValue)
}
// Step 2. Increase Instant to emulate metrics expiration after 1s
clock.ClockInstance.Instant = time.Unix(1, 10)
clock.ClockInstance.TickerCh <- time.Unix(0, 0)
events <- event.Events{}
// Check values
metrics, err = prometheus.DefaultGatherer.Gather()
if err != nil {
t.Fatal("Gather should not fail")
}
foobarValue = getFloat64(metrics, "foobar", prometheus.Labels{})
bazquxValue = getFloat64(metrics, "bazqux", prometheus.Labels{})
if foobarValue != nil {
t.Fatalf("Gauge `foobar` should be expired")
}
if bazquxValue == nil {
t.Fatalf("Summary `bazqux` should be gathered")
}
if *bazquxValue != 42 {
t.Fatalf("Summary `bazqux` observation %f is not expected. Should be 42", *bazquxValue)
}
// Step 3. Increase Instant to emulate metrics expiration after 2s
clock.ClockInstance.Instant = time.Unix(2, 200)
clock.ClockInstance.TickerCh <- time.Unix(0, 0)
events <- event.Events{}
// Check values
metrics, err = prometheus.DefaultGatherer.Gather()
if err != nil {
t.Fatal("Gather should not fail")
}
foobarValue = getFloat64(metrics, "foobar", prometheus.Labels{})
bazquxValue = getFloat64(metrics, "bazqux", prometheus.Labels{})
if bazquxValue != nil {
t.Fatalf("Summary `bazqux` should be expired")
}
if foobarValue != nil {
t.Fatalf("Gauge `foobar` should not be gathered after expiration")
}
}
func TestHashLabelNames(t *testing.T) {
r := registry.NewRegistry(prometheus.DefaultRegisterer, nil)
// Validate value hash changes and name has doesn't when just the value changes.
hash1, _ := r.HashLabels(map[string]string{
"label": "value1",
})
hash2, _ := r.HashLabels(map[string]string{
"label": "value2",
})
if hash1.Names != hash2.Names {
t.Fatal("Hash of label names should match, but doesn't")
}
if hash1.Values == hash2.Values {
t.Fatal("Hash of label names shouldn't match, but do")
}
// Validate value and name hashes change when the name changes.
hash1, _ = r.HashLabels(map[string]string{
"label1": "value",
})
hash2, _ = r.HashLabels(map[string]string{
"label2": "value",
})
if hash1.Names == hash2.Names {
t.Fatal("Hash of label names shouldn't match, but do")
}
if hash1.Values == hash2.Values {
t.Fatal("Hash of label names shouldn't match, but do")
}
}
// getFloat64 search for metric by name in array of MetricFamily and then search a value by labels.
// Method returns a value or nil if metric is not found.
func getFloat64(metrics []*dto.MetricFamily, name string, labels prometheus.Labels) *float64 {
var metricFamily *dto.MetricFamily
for _, m := range metrics {
if *m.Name == name {
metricFamily = m
break
}
}
if metricFamily == nil {
return nil
}
var metric *dto.Metric
labelStr := fmt.Sprintf("%v", labels)
for _, m := range metricFamily.Metric {
l := labelPairsAsLabels(m.GetLabel())
ls := fmt.Sprintf("%v", l)
if labelStr == ls {
metric = m
break
}
}
if metric == nil {
return nil
}
var value float64
if metric.Gauge != nil {
value = metric.Gauge.GetValue()
return &value
}
if metric.Counter != nil {
value = metric.Counter.GetValue()
return &value
}
if metric.Histogram != nil {
value = metric.Histogram.GetSampleSum()
return &value
}
if metric.Summary != nil {
value = metric.Summary.GetSampleSum()
return &value
}
if metric.Untyped != nil {
value = metric.Untyped.GetValue()
return &value
}
panic(fmt.Errorf("collected a non-gauge/counter/histogram/summary/untyped metric: %s", metric))
}
func labelPairsAsLabels(pairs []*dto.LabelPair) (labels prometheus.Labels) {
labels = prometheus.Labels{}
for _, pair := range pairs {
if pair.Name == nil {
continue
}
value := ""
if pair.Value != nil {
value = *pair.Value
}
labels[*pair.Name] = value
}
return
}
func getTelemetryCounterValue(counter prometheus.Counter) float64 {
var metric dto.Metric
err := counter.Write(&metric)
if err != nil {
return 0.0
}
return metric.Counter.GetValue()
}
func BenchmarkParseDogStatsDTags(b *testing.B) {
scenarios := map[string]string{
"1 tag w/hash": "#test:tag",
"1 tag w/o hash": "test:tag",
"2 tags, mixed hashes": "tag1:test,#tag2:test",
"3 long tags": "tag1:reallylongtagthisisreallylong,tag2:anotherreallylongtag,tag3:thisisyetanotherextraordinarilylongtag",
"a-z tags": "a:0,b:1,c:2,d:3,e:4,f:5,g:6,h:7,i:8,j:9,k:0,l:1,m:2,n:3,o:4,p:5,q:6,r:7,s:8,t:9,u:0,v:1,w:2,x:3,y:4,z:5",
}
parser := line.NewParser()
parser.EnableDogstatsdParsing()
b.ResetTimer()
for name, tags := range scenarios {
b.Run(name, func(b *testing.B) {
for n := 0; n < b.N; n++ {
labels := map[string]string{}
parser.ParseDogStatsDTags(tags, labels, tagErrors, log.NewNopLogger())
}
})
}
}
func BenchmarkHashNameAndLabels(b *testing.B) {
scenarios := []struct {
name string
metric string
labels map[string]string
}{
{
name: "no labels",
labels: map[string]string{},
}, {
name: "one label",
labels: map[string]string{
"label": "value",
},
}, {
name: "many labels",
labels: map[string]string{
"label0": "value",
"label1": "value",
"label2": "value",
"label3": "value",
"label4": "value",
"label5": "value",
"label6": "value",
"label7": "value",
"label8": "value",
"label9": "value",
},
},
}
r := registry.NewRegistry(prometheus.DefaultRegisterer, nil)
for _, s := range scenarios {
b.Run(s.name, func(b *testing.B) {
for n := 0; n < b.N; n++ {
r.HashLabels(s.labels)
}
})
}
}