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|
package main
import (
"bufio"
"bytes"
"encoding/json"
"errors"
"flag"
"fmt"
"io"
"io/fs"
"log"
"os"
"path/filepath"
"strings"
"sync"
"github.com/Voodfy/go-mediainfo/mediainfo"
"github.com/pkg/profile"
)
func main() {
d := "chemin d'accès"
directory := flag.String("directory", d, "directory to scan")
concurency := flag.Int("concurrency", 1, "set the concurrency level")
profil := flag.String("pprof", "", "a profile kind to record (cpu, mem, allocs)")
flag.Parse()
{
profiles := map[string]func(p *profile.Profile){
"cpu": profile.CPUProfile,
"mem": profile.MemProfile,
"allocs": profile.MemProfileAllocs,
}
if *profil != "" {
p, ok := profiles[*profil]
if ok {
defer profile.Start(
profile.Quiet,
profile.ProfilePath("."),
p,
).Stop()
}
}
}
_ = directory
_ = concurency
if *concurency < 1 {
log.Println("invalid concurrency level, it must be greater than 0")
os.Exit(1)
}
if *directory == "" {
log.Println("invalid directory, the value is required")
os.Exit(1)
}
dst := io.Writer(os.Stdout)
// dst = io.Discard
var err error
if *concurency < 2 {
err = procedural(*directory, dst)
} else {
err = concurrent(*directory, *concurency, dst)
}
if err != nil {
log.Println("an error occured:", err)
os.Exit(1)
}
}
func procedural(directory string, dst io.Writer) error {
enc := json.NewEncoder(dst)
mi := mediainfo.New()
defer mi.Close()
filesystem := os.DirFS(directory)
err := fs.WalkDir(filesystem, ".", func(path string, d fs.DirEntry, err error) error {
if err != nil {
return err
}
if d.IsDir() {
return nil
}
path = filepath.Join(directory, path)
res := parseMediaInfo(mi, path)
err = enc.Encode(res)
return err
})
return err
}
func concurrent(directory string, cnt int, dst io.Writer) error {
in := make(chan string, 100)
out := make(chan parsedMediaInfo, 100)
generalError := make(chan error, 2)
var wg sync.WaitGroup
for i := 0; i < cnt; i++ {
wg.Add(1)
go func() {
defer wg.Done()
mi := mediainfo.New()
defer mi.Close()
for file := range in {
out <- parseMediaInfo(mi, file)
}
}()
}
go func() {
wg.Wait()
close(out)
}()
var wgErr sync.WaitGroup
wgErr.Add(1)
go func() {
defer wgErr.Done()
filesystem := os.DirFS(directory)
err := fs.WalkDir(filesystem, ".", func(path string, d fs.DirEntry, err error) error {
if err != nil {
return err
}
if d.IsDir() {
return nil
}
path = filepath.Join(directory, path)
in <- path
return nil
})
if err != nil {
generalError <- err
}
close(in)
}()
wgErr.Add(1)
go func() {
defer wgErr.Done()
enc := json.NewEncoder(dst)
_ = enc
i := 0
defer func() {
fmt.Println(i)
}()
for res := range out {
i++
err := enc.Encode(res)
if err != nil {
generalError <- err
break
}
}
for range out {
}
}()
go func() {
wgErr.Wait()
close(generalError)
}()
var err error
for e := range generalError {
err = errors.Join(err, e)
}
return err
}
type parsedMediaInfo struct {
Err string `json:",omitempty"`
Info map[string]map[string]string
}
func parseMediaInfo(mi *mediainfo.MediaInfo, file string) (res parsedMediaInfo) {
if err := mi.Open(file); err != nil {
res.Err = fmt.Sprintf("%v: %v", err.Error(), file)
return
}
info := mi.Inform()
res.Info = map[string]map[string]string{}
sc := bufio.NewScanner(bytes.NewBufferString(info))
var currentKind string
lineIndex := -1
for sc.Scan() {
l := sc.Text()
l = strings.TrimSpace(l)
lineIndex++
if len(l) < 1 {
continue
}
semiColonPos := strings.Index(l, ":")
if semiColonPos < 0 {
currentKind = l
res.Info[currentKind] = map[string]string{}
continue
}
if currentKind == "" {
res.Err = fmt.Sprintf(
"unable to parse the content at line %v in file %v",
lineIndex, file,
)
return
}
col := l[:semiColonPos]
value := l[semiColonPos:]
col = strings.TrimSpace(col)
value = strings.TrimSpace(value)
res.Info[currentKind][col] = value
}
if err := sc.Err(); err != nil {
res.Err = fmt.Sprintf(
"unable to parse the content at line %v in file %v",
lineIndex, file,
)
}
return
} |
GO 1.21 - Accès aux métadonnées d'un fichier multimédia
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