syncthing/scanner/blockqueue.go
2014-08-12 15:04:02 +02:00

74 lines
1.5 KiB
Go

// Copyright (C) 2014 Jakob Borg and Contributors (see the CONTRIBUTORS file).
// All rights reserved. Use of this source code is governed by an MIT-style
// license that can be found in the LICENSE file.
package scanner
import (
"os"
"path/filepath"
"sync"
"github.com/syncthing/syncthing/protocol"
)
// The parallell hasher reads FileInfo structures from the inbox, hashes the
// file to populate the Blocks element and sends it to the outbox. A number of
// workers are used in parallel. The outbox will become closed when the inbox
// is closed and all items handled.
func newParallelHasher(dir string, blockSize, workers int, outbox, inbox chan protocol.FileInfo) {
var wg sync.WaitGroup
wg.Add(workers)
for i := 0; i < workers; i++ {
go func() {
hashFile(dir, blockSize, outbox, inbox)
wg.Done()
}()
}
go func() {
wg.Wait()
close(outbox)
}()
}
func hashFile(dir string, blockSize int, outbox, inbox chan protocol.FileInfo) {
for f := range inbox {
if protocol.IsDirectory(f.Flags) || protocol.IsDeleted(f.Flags) {
outbox <- f
continue
}
fd, err := os.Open(filepath.Join(dir, f.Name))
if err != nil {
if debug {
l.Debugln("open:", err)
}
continue
}
fi, err := fd.Stat()
if err != nil {
fd.Close()
if debug {
l.Debugln("stat:", err)
}
continue
}
blocks, err := Blocks(fd, blockSize, fi.Size())
fd.Close()
if err != nil {
if debug {
l.Debugln("hash error:", f.Name, err)
}
continue
}
f.Blocks = blocks
outbox <- f
}
}