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|
package files
import (
"context"
"crypto/sha256"
"encoding/json"
"fmt"
"io"
"io/fs"
"os"
"os/exec"
"path/filepath"
"regexp"
"strings"
"github.com/tidwall/buntdb"
)
func evaluateFile(database *buntdb.DB, hashsum string, filedata FileInfo) error {
return database.View(func(tx *buntdb.Tx) error {
data, err := tx.Get(hashsum)
if err != nil {
return err
}
var info FileInfo
if err := json.Unmarshal([]byte(data), &info); err != nil {
return err
}
if info == filedata {
return UpToDate
}
switch info.Modtime == filedata.Modtime {
case true:
if info.AbsPath == filedata.AbsPath {
if info.Process {
return NeedsReencode
}
return UpToDate
}
if info.Process {
return NeedsReencode
}
return MovedFile
default:
return nil
}
})
}
func getEncoderVer(path string) (string, error) {
out, err := exec.Command("metaflac", "--show-vendor-tag", path).Output()
if err != nil {
return "", err
}
r := regexp.MustCompile("libFLAC \\d\\.\\d\\.\\d")
encoder := r.FindString(string(out))
switch encoder {
case "":
return "", nil
default:
return strings.Split(encoder, " ")[1], nil
}
}
func updateFile(database *buntdb.DB, hashsum string, filedata FileInfo) error {
return database.Update(func(tx *buntdb.Tx) error {
data, err := json.Marshal(filedata)
if err != nil {
return err
}
if _, _, err := tx.Set(hashsum, string(data), nil); err != nil {
return err
}
return nil
})
}
func ProcessFile(ctx context.Context, path string, info fs.DirEntry) error {
tmp, err := info.Info()
if err != nil {
return err
}
modtime := tmp.ModTime()
database := ctx.Value("database").(*buntdb.DB)
file, err := os.Open(path)
if err != nil {
return err
}
defer file.Close()
hash := sha256.New()
if _, err := io.Copy(hash, file); err != nil {
return err
}
hashsum := fmt.Sprintf("%x", hash.Sum(nil))
abspath, err := filepath.Abs(path)
if err != nil {
return err
}
encoder, err := getEncoderVer(path)
filedata := FileInfo{AbsPath: abspath, Modtime: modtime, Encoder: encoder, Process: true}
err = evaluateFile(database, hashsum, filedata)
switch err {
case MovedFile, UpToDate:
if filedata.Encoder == ctx.Value("encoder").(string) {
return nil
}
case buntdb.ErrNotFound, NeedsReencode:
default:
return err
}
if err := updateFile(database, hashsum, filedata); err != nil {
return err
}
return nil
}
|
