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walker.go
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walker.go
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package main
import (
"encoding/hex"
"github.com/shawnsmithdev/tag"
"golang.org/x/sync/errgroup"
"log"
"os"
"path/filepath"
"time"
)
type walkResult struct {
path string
size int64
modTime time.Time
}
func walker(out chan *walkResult) filepath.WalkFunc {
return func(path string, info os.FileInfo, err error) error {
if err == nil && !info.IsDir() {
out <- &walkResult{
path: path,
size: info.Size(),
modTime: info.ModTime().UTC(),
}
}
return err
}
}
func runWalker(root string, paths chan *walkResult) {
defer close(paths)
// TODO: Check that this is a folder first
forbidErr(filepath.Walk(root, walker(paths)))
}
func readMeta(path string) (tag.Metadata, songHash, error) {
var (
songFile *os.File
meta tag.Metadata
tagHash string
hash songHash
foundHash = false
err error
)
if songFile, err = os.Open(path); err != nil {
return nil, hash, err
}
if meta, err = tag.ReadFrom(songFile); err != nil {
return nil, hash, nil // not an audio file, or otherwise unreadable
}
if _, err = songFile.Seek(0, 0); err != nil {
return nil, hash, err
}
if meta.FileType() == tag.FLAC {
if hash, err = flacMd5(songFile); err == nil {
foundHash = true
}
}
if !foundHash {
if tagHash, err = tag.Sum(songFile); err != nil {
return nil, hash, err
} else if decoded, err := hex.DecodeString(tagHash); err != nil {
return nil, hash, err
} else {
copy(hash[:], decoded)
}
}
return meta, hash, songFile.Close()
}
type songAndArt struct {
song *Song
art *Art
}
func handleSongWalk(wr *walkResult, out chan songAndArt) error {
meta, hash, err := readMeta(wr.path)
if err == nil {
if meta == nil { // probably not a song
return nil
}
hash64 := hash.String()
file := hash64
ext := filepath.Ext(wr.path)
if len(ext) > 0 {
file += ext
}
// song
song := &Song{
File: file,
MetaFile: hash64 + ".json",
Size: wr.size,
ModTime: wr.modTime,
Path: wr.path,
Hash: hash,
}
song.copyMetadata(meta)
// art
pic := meta.Picture()
var songArt *Art
if pic != nil {
songArt = &Art{
Data: pic.Data,
Ext: pic.Ext,
MimeType: pic.MIMEType,
}
}
out <- songAndArt{
song: song,
art: songArt,
}
} else {
log.Println("meta error", err)
}
return err
}
func runSongWalkers(root string, parallel int) chan songAndArt {
paths := make(chan *walkResult, parallel*16)
go runWalker(root, paths)
out := make(chan songAndArt, parallel*2)
go func() {
defer close(out)
var eg errgroup.Group
for i := 0; i < parallel; i++ {
eg.Go(func() error {
for result := range paths {
if err := handleSongWalk(result, out); err != nil {
return err
}
}
return nil
})
}
forbidErr(eg.Wait())
}()
return out
}
func runPathWalkers(mobile string) map[string]struct{} {
paths := make(chan *walkResult, 256)
go runWalker(mobile, paths)
result := make(map[string]struct{})
var nothing struct{}
for wr := range paths {
result[wr.path] = nothing
}
return result
}