statsd_exporter/exporter_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 main
import (
"fmt"
"net"
"testing"
"time"
"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/mapper"
)
// 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 Events)
go func() {
c := Events{
&CounterEvent{
metricName: "foo",
value: -1,
},
}
events <- c
close(events)
}()
ex := NewExporter(&mapper.MetricMapper{})
ex.Listen(events)
}
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// 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())
}
}()
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events := make(chan Events)
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go func() {
for _, l := range []statsDPacketHandler{&StatsDUDPListener{}, &mockStatsDTCPListener{}} {
l.handlePacket([]byte("bar:200|c|#tag:value\nbar:200|c|#tag:\xc3\x28invalid"), events)
}
close(events)
}()
ex := NewExporter(&mapper.MetricMapper{})
ex.Listen(events)
}
func TestHistogramUnits(t *testing.T) {
// Start exporter with a synchronous channel
events := make(chan Events)
go func() {
ex := NewExporter(&mapper.MetricMapper{})
ex.mapper.Defaults.TimerType = mapper.TimerTypeHistogram
ex.Listen(events)
}()
// Synchronously send a statsd event to wait for handleEvent execution.
// Then close events channel to stop a listener.
name := "foo"
c := Events{
&TimerEvent{
metricName: name,
value: 300,
},
}
events <- c
events <- 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("Histogram observations not scaled into Seconds")
} else if *value != .300 {
t.Fatalf("Received unexpected value for histogram observation %f != .300", *value)
}
}
type statsDPacketHandler interface {
handlePacket(packet []byte, e chan<- Events)
}
type mockStatsDTCPListener struct {
StatsDTCPListener
}
func (ml *mockStatsDTCPListener) handlePacket(packet []byte, e chan<- Events) {
// 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()
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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))
}
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}()
sc, err := lc.AcceptTCP()
if err != nil {
panic(fmt.Sprintf("mockStatsDTCPListener: accept failed: %v", err))
}
ml.handleConn(sc, e)
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}
func TestEscapeMetricName(t *testing.T) {
scenarios := map[string]string{
"clean": "clean",
"0starts_with_digit": "_0starts_with_digit",
"with_underscore": "with_underscore",
"with.dot": "with_dot",
"with😱emoji": "with_emoji",
"with.*.multiple": "with___multiple",
"test.web-server.foo.bar": "test_web_server_foo_bar",
}
for in, want := range scenarios {
if got := escapeMetricName(in); want != got {
t.Errorf("expected `%s` to be escaped to `%s`, got `%s`", in, want, got)
}
}
}
// 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 Events)
defer close(events)
go func() {
ex := NewExporter(testMapper)
ex.Listen(events)
}()
ev := Events{
// event with default ttl = 1s
&GaugeEvent{
metricName: "foobar",
value: 200,
},
// event with ttl = 2s from a mapping
&TimerEvent{
metricName: "bazqux.main",
value: 42000,
},
}
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 <- 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 <- 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 <- 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")
}
}
// 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
labelsHash := hashNameAndLabels(name, labels)
for _, m := range metricFamily.Metric {
h := hashNameAndLabels(name, labelPairsAsLabels(m.GetLabel()))
if h == labelsHash {
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
}