func invokeVisualizer(interactive **bool, format PostProcessor, suffix string, visualizers []string) PostProcessor {
return func(input *bytes.Buffer, output io.Writer, ui plugin.UI) error {
if err := makeVizTmpDir(); err != nil {
return err
}
tempFile, err := tempfile.New(vizTmpDir, "pprof", "."+suffix)
if err != nil {
return err
}
tempfile.DeferDelete(tempFile.Name())
if err = format(input, tempFile, ui); err != nil {
return err
}
tempFile.Close() // on windows, if the file is Open, start cannot access it.
// Try visualizers until one is successful
for _, v := range visualizers {
// Separate command and arguments for exec.Command.
args := strings.Split(v, " ")
if len(args) == 0 {
continue
}
viewer := exec.Command(args[0], append(args[1:], tempFile.Name())...)
viewer.Stderr = os.Stderr
if err = viewer.Start(); err == nil {
if !**interactive {
// In command-line mode, wait for the viewer to be closed
// before proceeding
return viewer.Wait()
}
return nil
}
}
return err
}
}
func makeVizTmpDir() error {
if vizTmpDir != "" {
return nil
}
name, err := ioutil.TempDir("", "pprof-")
if err != nil {
return err
}
tempfile.DeferDelete(name)
vizTmpDir = name
return nil
}