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main.go
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main.go
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package main
import (
"bufio"
"bytes"
"context"
"flag"
"fmt"
"log"
"os"
"os/exec"
"path/filepath"
"strconv"
"strings"
"time"
)
// You wouldn't think our child could start before us, but I have observed it; maybe due to rounding?
var start = time.Now().Unix() - 1
func main() {
var (
flagProcessExporter = flag.String("process-exporter", "./process-exporter", "path to process-exporter")
flagLoadGenerator = flag.String("load-generator", "./load-generator", "path to load-generator")
flagAttempts = flag.Int("attempts", 3, "try this many times before returning failure")
flagWriteSizeBytes = flag.Int("write-size-bytes", 1024*1024, "how many bytes to write each cycle")
)
flag.Parse()
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
cmdlg := exec.CommandContext(ctx, *flagLoadGenerator, "-write-size-bytes", strconv.Itoa(*flagWriteSizeBytes))
var buf = &bytes.Buffer{}
cmdlg.Stdout = buf
err := cmdlg.Start()
if err != nil {
log.Fatalf("Error launching load generator %q: %v", *flagLoadGenerator, err)
}
for !strings.HasPrefix(buf.String(), "ready") {
time.Sleep(time.Second)
}
success := false
for i := 0; i < *flagAttempts; i++ {
comm := filepath.Base(*flagLoadGenerator)
cmdpe := exec.CommandContext(ctx, *flagProcessExporter, "-once-to-stdout-delay", "20s",
"-procnames", comm, "-threads=true")
out, err := cmdpe.Output()
if err != nil {
log.Fatalf("Error launching process-exporter %q: %v", *flagProcessExporter, err)
}
log.Println(string(out))
results := getResults(comm, string(out))
if verify(results) {
success = true
break
}
log.Printf("try %d/%d failed", i+1, *flagAttempts)
}
cancel()
cmdlg.Wait()
if !success {
os.Exit(1)
}
}
type result struct {
name string
labels map[string]string
value float64
}
func getResults(group string, out string) map[string][]result {
results := make(map[string][]result)
skiplabel := fmt.Sprintf(`groupname="%s"`, group)
lines := bufio.NewScanner(strings.NewReader(out))
lines.Split(bufio.ScanLines)
for lines.Scan() {
line := lines.Text()
metric, value := "", 0.0
_, err := fmt.Sscanf(line, "namedprocess_namegroup_%s %f", &metric, &value)
if err != nil {
continue
}
pos := strings.IndexByte(metric, '{')
if pos == -1 {
log.Fatalf("cannot parse metric %q, no open curly found", metric)
}
name, labelstr := metric[:pos], metric[pos+1:]
labelstr = labelstr[:len(labelstr)-1]
labels := make(map[string]string)
for _, kv := range strings.Split(labelstr, ",") {
if kv != skiplabel {
pieces := strings.SplitN(kv, "=", 2)
labelname, labelvalue := pieces[0], pieces[1][1:len(pieces[1])-1]
labels[labelname] = labelvalue
}
}
results[name] = append(results[name], result{name, labels, value})
}
return results
}
func verify(results map[string][]result) bool {
success := true
assertExact := func(name string, got, want float64) {
if got != want {
success = false
log.Printf("expected %s to be %f, got %f", name, want, got)
}
}
assertGreaterOrEqual := func(name string, got, want float64) {
if got < want {
success = false
log.Printf("expected %s to have at least %f, got %f", name, want, got)
}
}
assertExact("num_procs", results["num_procs"][0].value, 1)
// Four locked threads plus go runtime means more than 7, but we'll say 7 to play it safe.
assertGreaterOrEqual("num_threads", results["num_threads"][0].value, 7)
// Our child must have started later than us.
assertGreaterOrEqual("oldest_start_time_seconds",
results["oldest_start_time_seconds"][0].value, float64(start))
for _, result := range results["states"] {
switch state := result.labels["state"]; state {
case "Other", "Zombie":
assertExact("state "+state, result.value, 0)
case "Running":
assertGreaterOrEqual("state "+state, result.value, 2)
case "Waiting":
assertGreaterOrEqual("state "+state, result.value, 0)
case "Sleeping":
assertGreaterOrEqual("state "+state, result.value, 4)
}
}
for _, result := range results["thread_count"] {
switch tname := result.labels["threadname"]; tname {
case "blocking", "sysbusy", "userbusy", "waiting":
assertExact("thread_count "+tname, result.value, 1)
case "main":
assertGreaterOrEqual("thread_count "+tname, result.value, 3)
}
}
for _, result := range results["thread_cpu_seconds_total"] {
if result.labels["mode"] == "system" {
switch tname := result.labels["threadname"]; tname {
case "sysbusy", "blocking":
assertGreaterOrEqual("thread_cpu_seconds_total system "+tname, result.value, 0.00001)
default:
assertGreaterOrEqual("thread_cpu_seconds_total system "+tname, result.value, 0)
}
} else if result.labels["mode"] == "user" {
switch tname := result.labels["threadname"]; tname {
case "userbusy":
assertGreaterOrEqual("thread_cpu_seconds_total user "+tname, result.value, 0.00001)
default:
assertGreaterOrEqual("thread_cpu_seconds_total user "+tname, result.value, 0)
}
}
}
for _, result := range results["thread_io_bytes_total"] {
tname, iomode := result.labels["threadname"], result.labels["iomode"]
if iomode == "read" {
continue
}
rname := fmt.Sprintf("%s %s %s", "thread_io_bytes_total", iomode, tname)
switch tname {
case "blocking", "sysbusy":
assertGreaterOrEqual(rname, result.value, 0.00001)
default:
assertExact(rname, result.value, 0)
}
}
otherwchan := 0.0
for _, result := range results["threads_wchan"] {
switch wchan := result.labels["wchan"]; wchan {
case "poll_schedule_timeout":
assertGreaterOrEqual(wchan, result.value, 1)
case "futex_wait_queue_me":
assertGreaterOrEqual(wchan, result.value, 4)
default:
// The specific wchan involved for the blocking thread varies by filesystem.
otherwchan++
}
}
// assertGreaterOrEqual("other wchan", otherwchan, 1)
return success
}