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mq_exporter_test.go
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mq_exporter_test.go
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// Copyright 2021-2022 Andreas Gebhardt
//
// 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
//
// https://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 (
"io"
"net/http"
"os"
"regexp"
"strings"
"testing"
)
var configArg = "--config=fixtures/config-no-queues.yaml"
type listenAddrListener struct {
c chan (string)
}
func (l listenAddrListener) Log(keyvals ...interface{}) error {
if len(keyvals) == 6 && keyvals[3].(string) == "Listening on" {
addr := keyvals[5].(string)
l.c <- addr
}
return nil
}
func (l listenAddrListener) addr() string {
return <-l.c
}
func (l listenAddrListener) close() {
close(l.c)
}
func newListenAddrListener() listenAddrListener {
return listenAddrListener{c: make(chan string, 1)}
}
func TestDefaultMetricsEndpoint(t *testing.T) {
l := newListenAddrListener()
defer l.close()
app := newAppCtx([]string{"--web.listen-address=127.0.0.1:0", configArg}, os.Stdout, os.Stderr, l)
go app.run()
resp, err := http.Get("http://" + l.addr() + "/metrics")
if err != nil {
t.Error(err)
}
defer resp.Body.Close()
statusCode := 200
if resp.StatusCode != statusCode {
t.Log("expected:", statusCode)
t.Log(" got:", resp.StatusCode)
t.Error("HTTP status code does not match.")
}
responseBody, err := io.ReadAll(resp.Body)
if err != nil {
t.Error(err)
}
body := string(responseBody)
if !strings.Contains(body, "# HELP promhttp_metric_handler_requests_total") {
t.Errorf("Want response body to contains '# HELP promhttp_metric_handler_requests_total'. But found none in:\n%s", body)
}
if !strings.Contains(body, "# HELP process_cpu_seconds_total") {
t.Errorf("Want response body to contains '# HELP process_cpu_seconds_total'. But found none in:\n%s", body)
}
if !strings.Contains(body, "# HELP go_gc_duration_seconds") {
t.Errorf("Want response body to contains '# HELP go_gc_duration_seconds'. But found none in:\n%s", body)
}
app.sigs <- os.Interrupt
}
func TestCustomMetricsEndpoint(t *testing.T) {
l := newListenAddrListener()
defer l.close()
app := newAppCtx([]string{"--web.listen-address=:0", "--web.telemetry-path=/telemetry", configArg}, os.Stdout, os.Stderr, l)
go app.run()
resp, err := http.Get("http://" + l.addr() + "/telemetry")
if err != nil {
t.Error(err)
}
defer resp.Body.Close()
statusCode := 200
if resp.StatusCode != statusCode {
t.Log("expected:", statusCode)
t.Log(" got:", resp.StatusCode)
t.Error("HTTP status code does not match.")
}
responseBody, err := io.ReadAll(resp.Body)
if err != nil {
t.Error(err)
}
if !strings.HasPrefix(string(responseBody), "# HELP") {
t.Errorf("Want response body to have prefix '# HELP'. But found none in:\n%s", string(responseBody))
}
app.sigs <- os.Interrupt
}
func TestLandingPageDefaultMetricsEndpoint(t *testing.T) {
l := newListenAddrListener()
defer l.close()
app := newAppCtx([]string{"--web.listen-address=:0", configArg}, os.Stdout, os.Stderr, l)
go app.run()
resp, err := http.Get("http://" + l.addr() + "/")
if err != nil {
t.Error(err)
}
defer resp.Body.Close()
statusCode := 200
if resp.StatusCode != statusCode {
t.Log("expected:", statusCode)
t.Log(" got:", resp.StatusCode)
t.Error("HTTP status code does not match.")
}
responseBody, err := io.ReadAll(resp.Body)
if err != nil {
t.Error(err)
}
if !strings.Contains(string(responseBody), "<a href='/metrics'>Metrics</a>") {
t.Errorf("Want link to default metrics endpoint. But found none in:\n%s", string(responseBody))
}
app.sigs <- os.Interrupt
}
func TestLandingPageCustomMetricsEndpoint(t *testing.T) {
l := newListenAddrListener()
defer l.close()
app := newAppCtx([]string{"--web.listen-address=:0", "--web.telemetry-path=/telemetry", configArg}, os.Stdout, os.Stderr, l)
go app.run()
resp, err := http.Get("http://" + l.addr() + "/")
if err != nil {
t.Error(err)
}
defer resp.Body.Close()
statusCode := 200
if resp.StatusCode != statusCode {
t.Log("expected:", statusCode)
t.Log(" got:", resp.StatusCode)
t.Error("HTTP status code does not match.")
}
responseBody, err := io.ReadAll(resp.Body)
if err != nil {
t.Error(err)
}
if !strings.Contains(string(responseBody), "<a href='/telemetry'>Metrics</a>") {
t.Errorf("Want link to custom metrics endpoint. But found none in:\n%s", string(responseBody))
}
app.sigs <- os.Interrupt
}
func TestBuildInfoMetric(t *testing.T) {
l := newListenAddrListener()
defer l.close()
app := newAppCtx([]string{"--web.listen-address=127.0.0.1:0", configArg}, os.Stdout, os.Stderr, l)
go app.run()
resp, err := http.Get("http://" + l.addr() + "/metrics")
if err != nil {
t.Error(err)
}
defer resp.Body.Close()
statusCode := 200
if resp.StatusCode != statusCode {
t.Log("expected:", statusCode)
t.Log(" got:", resp.StatusCode)
t.Error("HTTP status code does not match.")
}
responseBody, err := io.ReadAll(resp.Body)
if err != nil {
t.Error(err)
}
body := string(responseBody)
want := "HELP mq_exporter_build_info A metric with a constant '1' value labeled by version, revision, branch, goversion from which mq_exporter was built, and the goos and goarch for the build."
if !strings.Contains(body, want) {
t.Errorf("Want response body to contains '%s'. But found none in:\n%s", want, body)
}
var goBuildInfo = regexp.MustCompile(`mq_exporter_build_info{branch="[^"]*",goarch="[^"]*",goos="[^"]*",goversion="[^"]*",revision="[^"]*",tags="[^"]*",version="[^"]*"} 1`)
if !goBuildInfo.MatchString(body) {
t.Errorf("Want response body to contains RegEx '%s'. But found none in:\n%s", goBuildInfo.String(), body)
}
app.sigs <- os.Interrupt
}