mirror of
https://github.com/syncthing/syncthing.git
synced 2024-11-17 02:48:57 -07:00
92 lines
2.1 KiB
Go
92 lines
2.1 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/syncthing/lib/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, counter Counter, done, cancel chan struct{}) {
|
|
wg := sync.NewWaitGroup()
|
|
wg.Add(workers)
|
|
|
|
for i := 0; i < workers; i++ {
|
|
go func() {
|
|
hashFiles(dir, blockSize, outbox, inbox, counter, cancel)
|
|
wg.Done()
|
|
}()
|
|
}
|
|
|
|
go func() {
|
|
wg.Wait()
|
|
if done != nil {
|
|
close(done)
|
|
}
|
|
close(outbox)
|
|
}()
|
|
}
|
|
|
|
func HashFile(path string, blockSize int, sizeHint int64, counter Counter) ([]protocol.BlockInfo, error) {
|
|
fd, err := os.Open(path)
|
|
if err != nil {
|
|
l.Debugln("open:", err)
|
|
return []protocol.BlockInfo{}, err
|
|
}
|
|
defer fd.Close()
|
|
|
|
if sizeHint == 0 {
|
|
fi, err := fd.Stat()
|
|
if err != nil {
|
|
l.Debugln("stat:", err)
|
|
return []protocol.BlockInfo{}, err
|
|
}
|
|
sizeHint = fi.Size()
|
|
}
|
|
|
|
return Blocks(fd, blockSize, sizeHint, counter)
|
|
}
|
|
|
|
func hashFiles(dir string, blockSize int, outbox, inbox chan protocol.FileInfo, counter Counter, cancel chan struct{}) {
|
|
for {
|
|
select {
|
|
case f, ok := <-inbox:
|
|
if !ok {
|
|
return
|
|
}
|
|
|
|
if f.IsDirectory() || f.IsDeleted() {
|
|
panic("Bug. Asked to hash a directory or a deleted file.")
|
|
}
|
|
|
|
blocks, err := HashFile(filepath.Join(dir, f.Name), blockSize, f.CachedSize, counter)
|
|
if err != nil {
|
|
l.Debugln("hash error:", f.Name, err)
|
|
continue
|
|
}
|
|
|
|
f.Blocks = blocks
|
|
select {
|
|
case outbox <- f:
|
|
case <-cancel:
|
|
return
|
|
}
|
|
|
|
case <-cancel:
|
|
return
|
|
}
|
|
}
|
|
}
|