/
mysqld_exporter_test.go
383 lines (349 loc) · 8.42 KB
/
mysqld_exporter_test.go
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// Copyright 2018 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 (
"context"
"fmt"
"io"
"net"
"net/http"
"net/url"
"os"
"os/exec"
"reflect"
"runtime"
"strings"
"syscall"
"testing"
"time"
"github.com/google/go-cmp/cmp"
"github.com/prometheus/mysqld_exporter/collector"
)
// bin stores information about path of executable and attached port
type bin struct {
path string
port int
}
// TestBin builds, runs and tests binary.
func TestBin(t *testing.T) {
var err error
binName := "mysqld_exporter"
binDir, err := os.MkdirTemp("/tmp", binName+"-test-bindir-")
if err != nil {
t.Fatal(err)
}
defer func() {
err := os.RemoveAll(binDir)
if err != nil {
t.Fatal(err)
}
}()
importpath := "github.com/prometheus/common"
path := binDir + "/" + binName
xVariables := map[string]string{
importpath + "/version.Version": "gotest-version",
importpath + "/version.Branch": "gotest-branch",
importpath + "/version.Revision": "gotest-revision",
}
var ldflags []string
for x, value := range xVariables {
ldflags = append(ldflags, fmt.Sprintf("-X %s=%s", x, value))
}
cmd := exec.Command(
"go",
"build",
"-o",
path,
"-ldflags",
strings.Join(ldflags, " "),
)
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
err = cmd.Run()
if err != nil {
t.Fatalf("Failed to build: %s", err)
}
tests := []func(*testing.T, bin){
testLanding,
testProbe,
}
portStart := 56000
t.Run(binName, func(t *testing.T) {
for _, f := range tests {
f := f // capture range variable
fName := runtime.FuncForPC(reflect.ValueOf(f).Pointer()).Name()
portStart++
data := bin{
path: path,
port: portStart,
}
t.Run(fName, func(t *testing.T) {
t.Parallel()
f(t, data)
})
}
})
}
func testLanding(t *testing.T, data bin) {
ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
defer cancel()
// Run exporter.
cmd := exec.CommandContext(
ctx,
data.path,
"--web.listen-address", fmt.Sprintf(":%d", data.port),
"--config.my-cnf=test_exporter.cnf",
)
if err := cmd.Start(); err != nil {
t.Fatal(err)
}
defer cmd.Wait()
defer cmd.Process.Kill()
// Get the main page.
urlToGet := fmt.Sprintf("http://127.0.0.1:%d", data.port)
body, err := waitForBody(urlToGet)
if err != nil {
t.Fatal(err)
}
got := string(body)
expected := `<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>MySQLd Exporter</title>
<style>body {
font-family: -apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,Noto Sans,Liberation Sans,sans-serif,Apple Color Emoji,Segoe UI Emoji,Segoe UI Symbol,Noto Color Emoji;
margin: 0;
}
header {
background-color: #e6522c;
color: #fff;
font-size: 1rem;
padding: 1rem;
}
main {
padding: 1rem;
}
label {
display: inline-block;
width: 0.5em;
}
</style>
</head>
<body>
<header>
<h1>MySQLd Exporter</h1>
</header>
<main>
<h2>Prometheus Exporter for MySQL servers</h2>
<div>Version: (version=gotest-version, branch=gotest-branch, revision=gotest-revision)</div>
<div>
<ul>
<li><a href="/metrics">Metrics</a></li>
</ul>
</div>
</main>
</body>
</html>
`
if diff := cmp.Diff(expected, got); diff != "" {
t.Fatalf("expected != got \n%v\n", diff)
}
}
func testProbe(t *testing.T, data bin) {
ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
defer cancel()
// Run exporter.
cmd := exec.CommandContext(
ctx,
data.path,
"--web.listen-address", fmt.Sprintf(":%d", data.port),
"--config.my-cnf=test_exporter.cnf",
)
if err := cmd.Start(); err != nil {
t.Fatal(err)
}
defer cmd.Wait()
defer cmd.Process.Kill()
// Get the main page.
urlToGet := fmt.Sprintf("http://127.0.0.1:%d/probe", data.port)
body, err := waitForBody(urlToGet)
if err != nil {
t.Fatal(err)
}
got := strings.TrimSpace(string(body))
expected := `target is required`
if got != expected {
t.Fatalf("got '%s' but expected '%s'", got, expected)
}
}
// waitForBody is a helper function which makes http calls until http server is up
// and then returns body of the successful call.
func waitForBody(urlToGet string) (body []byte, err error) {
tries := 60
// Get data, but we need to wait a bit for http server.
for i := 0; i <= tries; i++ {
// Try to get web page.
body, err = getBody(urlToGet)
if err == nil {
return body, err
}
// If there is a syscall.ECONNREFUSED error (web server not available) then retry.
if urlError, ok := err.(*url.Error); ok {
if opError, ok := urlError.Err.(*net.OpError); ok {
if osSyscallError, ok := opError.Err.(*os.SyscallError); ok {
if osSyscallError.Err == syscall.ECONNREFUSED {
time.Sleep(1 * time.Second)
continue
}
}
}
}
// There was an error, and it wasn't syscall.ECONNREFUSED.
return nil, err
}
return nil, fmt.Errorf("failed to GET %s after %d tries: %s", urlToGet, tries, err)
}
// getBody is a helper function which retrieves http body from given address.
func getBody(urlToGet string) ([]byte, error) {
resp, err := http.Get(urlToGet)
if err != nil {
return nil, err
}
defer resp.Body.Close()
body, err := io.ReadAll(resp.Body)
if err != nil {
return nil, err
}
return body, nil
}
func Test_filterScrapers(t *testing.T) {
type args struct {
scrapers []collector.Scraper
collectParams []string
}
tests := []struct {
name string
args args
want []collector.Scraper
}{
{"args_appears_in_collector",
args{
[]collector.Scraper{collector.ScrapeGlobalStatus{}},
[]string{collector.ScrapeGlobalStatus{}.Name()},
},
[]collector.Scraper{
collector.ScrapeGlobalStatus{},
}},
{"args_absent_in_collector",
args{
[]collector.Scraper{collector.ScrapeGlobalStatus{}},
[]string{collector.ScrapeGlobalVariables{}.Name()},
},
[]collector.Scraper{collector.ScrapeGlobalStatus{}}},
{"respect_params",
args{
[]collector.Scraper{
collector.ScrapeGlobalStatus{},
collector.ScrapeGlobalVariables{},
},
[]string{collector.ScrapeGlobalStatus{}.Name()},
},
[]collector.Scraper{
collector.ScrapeGlobalStatus{},
},
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
if got := filterScrapers(tt.args.scrapers, tt.args.collectParams); !reflect.DeepEqual(got, tt.want) {
t.Errorf("filterScrapers() = %v, want %v", got, tt.want)
}
})
}
}
func Test_getScrapeTimeoutSeconds(t *testing.T) {
type args struct {
timeoutHeader string
offset float64
}
tests := []struct {
name string
args args
wantTimeout float64
wantErr bool
}{
{"no_timeout_header",
args{},
0, false,
},
{"zero_timeout_header",
args{
timeoutHeader: "0",
},
0, false,
},
{"negative_timeout_header",
args{
timeoutHeader: "-5",
},
0, true,
},
{"offset_greater_than_timeout",
args{
timeoutHeader: "5",
offset: 6,
},
0, true,
},
{"offset_equal_timeout",
args{
timeoutHeader: "5",
offset: 5,
},
0, true,
},
{"offset_less_than_timeout",
args{
timeoutHeader: "5",
offset: 1,
},
4, false,
},
{"no_offset",
args{
timeoutHeader: "5",
},
5, false,
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
request, err := http.NewRequest(http.MethodGet, "", nil)
if err != nil {
t.Fatalf("unexpected error creating http request: %v", err)
}
request.Header.Set("X-Prometheus-Scrape-Timeout-Seconds", tt.args.timeoutHeader)
timeout, err := getScrapeTimeoutSeconds(request, tt.args.offset)
if err != nil && !tt.wantErr {
t.Fatalf("unexpected error: %v", err)
}
if err == nil && tt.wantErr {
t.Fatal("expecting an error, got nil")
}
if timeout != tt.wantTimeout {
t.Fatalf("unexpected timeout, got '%f' but expected '%f'", timeout, tt.wantTimeout)
}
})
}
}