syncthing/lib/scanner/blockqueue.go
2015-08-09 09:35:26 +02:00

79 lines
1.7 KiB
Go

// Copyright (C) 2014 The Syncthing Authors.
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this file,
// You can obtain one at http://mozilla.org/MPL/2.0/.
package scanner
import (
"os"
"path/filepath"
"github.com/syncthing/protocol"
"github.com/syncthing/syncthing/lib/sync"
)
// 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) {
wg := sync.NewWaitGroup()
wg.Add(workers)
for i := 0; i < workers; i++ {
go func() {
hashFiles(dir, blockSize, outbox, inbox)
wg.Done()
}()
}
go func() {
wg.Wait()
close(outbox)
}()
}
func HashFile(path string, blockSize int) ([]protocol.BlockInfo, error) {
fd, err := os.Open(path)
if err != nil {
if debug {
l.Debugln("open:", err)
}
return []protocol.BlockInfo{}, err
}
fi, err := fd.Stat()
if err != nil {
fd.Close()
if debug {
l.Debugln("stat:", err)
}
return []protocol.BlockInfo{}, err
}
defer fd.Close()
return Blocks(fd, blockSize, fi.Size())
}
func hashFiles(dir string, blockSize int, outbox, inbox chan protocol.FileInfo) {
for f := range inbox {
if f.IsDirectory() || f.IsDeleted() || f.IsSymlink() {
outbox <- f
continue
}
blocks, err := HashFile(filepath.Join(dir, f.Name), blockSize)
if err != nil {
if debug {
l.Debugln("hash error:", f.Name, err)
}
continue
}
f.Blocks = blocks
outbox <- f
}
}