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"
)
// 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, 1)
c := Events{
&CounterEvent{
metricName: "foo",
value: -1,
},
}
events <- c
ex := NewExporter(&metricMapper{})
// Close channel to signify we are done with the listener after a short period.
go func() {
time.Sleep(time.Millisecond * 100)
close(events)
}()
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) {
ex := NewExporter(&metricMapper{})
for _, l := range []statsDPacketHandler{&StatsDUDPListener{}, &mockStatsDTCPListener{}} {
events := make(chan Events, 2)
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l.handlePacket([]byte("bar:200|c|#tag:value\nbar:200|c|#tag:\xc3\x28invalid"), events)
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// Close channel to signify we are done with the listener after a short period.
go func() {
time.Sleep(time.Millisecond * 100)
close(events)
}()
ex.Listen(events)
}
}
type MockHistogram struct {
prometheus.Metric
prometheus.Collector
value float64
}
func (h *MockHistogram) Observe(n float64) {
h.value = n
}
func TestHistogramUnits(t *testing.T) {
events := make(chan Events, 1)
name := "foo"
c := Events{
&TimerEvent{
metricName: name,
value: 300,
},
}
events <- c
ex := NewExporter(&metricMapper{})
ex.mapper.Defaults.TimerType = timerTypeHistogram
// Close channel to signify we are done with the listener after a short period.
go func() {
time.Sleep(time.Millisecond * 100)
close(events)
}()
mock := &MockHistogram{}
key := hashNameAndLabels(name, nil)
ex.Histograms.Elements[key] = mock
ex.Listen(events)
if mock.value == 300 {
t.Fatalf("Histogram observations not scaled into Seconds")
} else if mock.value != .300 {
t.Fatalf("Received unexpected value for histogram observation %f != .300", mock.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)
}
}
}