syncthing/internal/scanner/blockqueue.go

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// Copyright (C) 2014 The Syncthing Authors.
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//
// This program 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 (at your option)
// any later version.
//
// This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
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package scanner
import (
"os"
"path/filepath"
"sync"
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"github.com/syncthing/syncthing/internal/protocol"
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)
// 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() {
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hashFiles(dir, blockSize, outbox, inbox)
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wg.Done()
}()
}
go func() {
wg.Wait()
close(outbox)
}()
}
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func HashFile(path string, blockSize int) ([]protocol.BlockInfo, error) {
fd, err := os.Open(path)
if err != nil {
if debug {
l.Debugln("open:", err)
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}
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return []protocol.BlockInfo{}, err
}
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fi, err := fd.Stat()
if err != nil {
fd.Close()
if debug {
l.Debugln("stat:", err)
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}
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return []protocol.BlockInfo{}, err
}
defer fd.Close()
return Blocks(fd, blockSize, fi.Size())
}
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func hashFiles(dir string, blockSize int, outbox, inbox chan protocol.FileInfo) {
for f := range inbox {
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if f.IsDirectory() || f.IsDeleted() || f.IsSymlink() {
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outbox <- f
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continue
}
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blocks, err := HashFile(filepath.Join(dir, f.Name), blockSize)
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if err != nil {
if debug {
l.Debugln("hash error:", f.Name, err)
}
continue
}
f.Blocks = blocks
outbox <- f
}
}