/
fingerprint.go
92 lines (75 loc) · 2.03 KB
/
fingerprint.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
package recognizer
import (
"errors"
"io/ioutil"
"net/http"
"os"
"os/exec"
"strconv"
"strings"
"sync"
"github.com/mzinin/tagger/utils"
)
const (
fpUtilVersion = "1.3.1"
)
var (
once sync.Once
)
func getFingerPrint(path string) (string, int, error) {
once.Do(getFpUtil)
output, err := exec.Command(pathToFpUtil(), path).Output()
if err != nil {
return "", 0, err
}
fingerPrint, duration := parseFpcalcOutput(output)
if len(fingerPrint) == 0 {
return "", 0, errors.New("empty fingerprint")
}
if duration == 0 {
return "", 0, errors.New("zero duration")
}
return fingerPrint, duration, nil
}
func parseFpcalcOutput(data []byte) (string, int) {
var fingerPrint string
var duration int
values := strings.Split(string(data), "\n")
for _, value := range values {
tokens := strings.Split(strings.Trim(value, "\r\n"), "=")
if len(tokens) != 2 {
continue
}
switch tokens[0] {
case "DURATION":
duration, _ = strconv.Atoi(tokens[1])
case "FINGERPRINT":
fingerPrint = tokens[1]
}
}
return fingerPrint, duration
}
func getFpUtil() {
// fingerprint util is here, do nothing
if _, err := os.Stat(pathToFpUtil()); err == nil {
return
}
// download fingerprint util
url := urlToFpUtil()
response, err := http.Get(url)
if err != nil || response.StatusCode != 200 {
utils.Log(utils.ERROR, "recognizer.getFpUtil: failed to download fingerprint util from '%v': %v", url, err)
return
}
content, err := ioutil.ReadAll(response.Body)
response.Body.Close()
if err != nil {
utils.Log(utils.ERROR, "recognizer.getFpUtil: failed to read content of '%v': %v", url, err)
return
}
// extract fingerprint util
extractFpUtil(content)
}
func pathToFpUtil() string {
return "./" + fpUtil()
}