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//
// pool-import
//
// Copyright (C) 2016 Christian Pointner <equinox@helsinki.at>
//
// This file is part of pool-import.
//
// pool-import is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// any later version.
//
// pool-import is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with pool-import. If not, see <http://www.gnu.org/licenses/>.
//
package main
import (
"encoding/base64"
"io"
"log"
"os"
"path/filepath"
"strings"
"sync"
"golang.org/x/crypto/blake2b"
)
type FileMap map[string]string
func (m FileMap) Merge(m2 FileMap) {
for key, value := range m2 {
m[key] = value
}
}
type MusicDir struct {
root string
stdlog *log.Logger
filesMtx sync.Mutex
Files FileMap
}
func handleEntry(C chan<- string, path string, info os.FileInfo, err error, stdlog *log.Logger) error {
if err != nil {
return err
}
if info.IsDir() {
stdlog.Printf("entering directory: %s", path)
return nil
}
if !info.Mode().IsRegular() {
stdlog.Printf(" - skipping (special file): %s", info.Name())
return nil
}
switch strings.ToLower(filepath.Ext(path)) {
case ".flac":
fallthrough
case ".ogg":
fallthrough
case ".wav":
fallthrough
case ".mp3":
fallthrough
case ".aac":
fallthrough
case ".mp4":
fallthrough
case ".m4a":
C <- path
default:
stdlog.Printf(" - skipping (unknown extension): %s", info.Name())
}
return nil
}
func computeHash(path string) (string, error) {
hash, err := blake2b.New256(nil)
if err != nil {
return "", err
}
file, err := os.Open(path)
if err != nil {
return "", err
}
defer file.Close()
if _, err := io.Copy(hash, file); err != nil {
return "", err
}
return base64.URLEncoding.EncodeToString(hash.Sum(nil)), nil
}
func (d *MusicDir) collectHashes(C <-chan string, numThreads int) (wg *sync.WaitGroup) {
wg = &sync.WaitGroup{}
for i := 0; i < numThreads; i++ {
wg.Add(1)
go func(num int) {
defer wg.Done()
for {
file, ok := <-C
if !ok {
return
}
if hash, err := computeHash(file); err != nil {
d.stdlog.Printf(" - skipping (%v): %s", err, filepath.Base(file))
} else {
d.stdlog.Printf(" - hashed: %s", filepath.Base(file))
d.filesMtx.Lock()
d.Files[hash] = file
d.filesMtx.Unlock()
}
}
}(i)
}
return
}
func (d *MusicDir) ComputeHashes() (err error) {
C := make(chan string, 10)
wg := d.collectHashes(C, 4) // TODO: make number of hashing threads configurable
err = filepath.Walk(d.root, func(path string, info os.FileInfo, err error) error {
return handleEntry(C, path, info, err, d.stdlog)
})
close(C)
if err != nil {
return
}
wg.Wait()
return
}
func NewMusicDir(root string, stdlog *log.Logger) (dir *MusicDir) {
dir = &MusicDir{root: root, stdlog: stdlog}
dir.Files = make(map[string]string)
return
}
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