hash.go

func (f *F) GetImageHash(filepath string) (string, error) {
	start := time.Now()

	cmd := exec.Command(f.pdqPath, filepath)
	out, err := cmd.StdoutPipe()
	if err != nil {
		return "", err
	}

	if err := cmd.Start(); err != nil {
		return "", err
	}

	b, err := io.ReadAll(out)
	if err != nil {
		return "", err
	}

	if err := cmd.Wait(); err != nil {
		return "", err
	}

	respParts := strings.Split(string(b), ",")
	if len(respParts) != 3 {
		return "", fmt.Errorf("invalid response from pdq")
	}

	f.hashHist.WithLabelValues("hash").Observe(time.Since(start).Seconds())

	return respParts[0], nil
}