137 lines
3.0 KiB
Go
137 lines
3.0 KiB
Go
package main
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import (
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"fmt"
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"io/ioutil"
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"net/http"
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"os"
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"os/exec"
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"path/filepath"
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"testing"
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"time"
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"github.com/prometheus/procfs"
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)
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const (
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binary = "./node_exporter"
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address = "localhost:19100"
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)
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func TestFileDescriptorLeak(t *testing.T) {
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if _, err := os.Stat(binary); err != nil {
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t.Skipf("node_exporter binary not available, try to run `make build` first: %s", err)
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}
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if _, err := procfs.NewStat(); err != nil {
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t.Skipf("proc filesystem is not available, but currently required to read number of open file descriptors: %s", err)
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}
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exporter := exec.Command(binary, "-web.listen-address", address)
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test := func(pid int) error {
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if err := queryExporter(address); err != nil {
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return err
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}
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proc, err := procfs.NewProc(pid)
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if err != nil {
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return err
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}
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fdsBefore, err := proc.FileDescriptors()
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if err != nil {
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return err
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}
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for i := 0; i < 5; i++ {
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if err := queryExporter(address); err != nil {
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return err
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}
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}
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fdsAfter, err := proc.FileDescriptors()
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if err != nil {
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return err
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}
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if want, have := len(fdsBefore), len(fdsAfter); want != have {
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return fmt.Errorf("want %d open file descriptors after metrics scrape, have %d", want, have)
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}
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return nil
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}
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if err := runCommandAndTests(exporter, test); err != nil {
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t.Error(err)
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}
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}
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func TestHandlingOfDuplicatedMetrics(t *testing.T) {
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if _, err := os.Stat(binary); err != nil {
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t.Skipf("node_exporter binary not available, try to run `make build` first: %s", err)
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}
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dir, err := ioutil.TempDir("", "node-exporter")
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if err != nil {
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t.Fatal(err)
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}
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defer os.RemoveAll(dir)
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content := []byte("dummy_metric 1\n")
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if err := ioutil.WriteFile(filepath.Join(dir, "a.prom"), content, 0600); err != nil {
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t.Fatal(err)
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}
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if err := ioutil.WriteFile(filepath.Join(dir, "b.prom"), content, 0600); err != nil {
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t.Fatal(err)
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}
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exporter := exec.Command(binary, "-web.listen-address", address, "-collector.textfile.directory", dir)
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test := func(_ int) error {
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return queryExporter(address)
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}
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if err := runCommandAndTests(exporter, test); err != nil {
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t.Error(err)
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}
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}
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func queryExporter(address string) error {
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resp, err := http.Get(fmt.Sprintf("http://%s/metrics", address))
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if err != nil {
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return err
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}
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if err := resp.Body.Close(); err != nil {
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return err
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}
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if want, have := http.StatusOK, resp.StatusCode; want != have {
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return fmt.Errorf("want /metrics status code %d, have %d", want, have)
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}
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return nil
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}
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func runCommandAndTests(cmd *exec.Cmd, fn func(pid int) error) error {
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errc := make(chan error)
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go func() {
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if err := cmd.Run(); err != nil {
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errc <- fmt.Errorf("execution of command failed: %s", err)
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} else {
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errc <- nil
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}
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}()
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// Allow the process to start before running any tests.
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select {
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case err := <-errc:
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return err
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case <-time.After(100 * time.Millisecond):
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}
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go func(pid int) {
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errc <- fn(pid)
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}(cmd.Process.Pid)
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select {
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case err := <-errc:
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if cmd.Process != nil {
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cmd.Process.Kill()
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}
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if err != nil {
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return err
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}
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}
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return nil
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}
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