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/* Copyright (C) 2021 Nicolas Peugnet <n.peugnet@free.fr>
This file is part of dna-backup.
dna-backup 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.
dna-backup 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 dna-backup. If not, see <https://www.gnu.org/licenses/>. */
package repo
import (
"bytes"
"compress/zlib"
"encoding/binary"
"io"
"github.com/n-peugnet/dna-backup/dna"
"github.com/n-peugnet/dna-backup/logger"
"github.com/n-peugnet/dna-backup/utils"
)
type Version struct {
Chunks uint64
Recipe uint64
Files uint64
}
func (r *Repo) ExportDir(dest string, trackSize int) {
r.Init()
versions := make([]Version, len(r.versions))
chunks := r.loadChunks(r.versions)
for i := range versions {
var count int64
var content bytes.Buffer // replace with a reader capable of switching files
var recipe, fileList []byte
var err error
tracker := dna.NewWriter(&content, trackSize)
counter := utils.NewWriteCounter(tracker)
compressor := zlib.NewWriter(counter)
for _, c := range chunks[i] {
n, err := io.Copy(compressor, c.Reader())
if err != nil {
logger.Error(err)
}
count += n
}
compressor.Close()
tracker.Close()
readDelta(r.versions[i], recipeName, utils.NopReadWrapper, func(rc io.ReadCloser) {
recipe, err = io.ReadAll(rc)
if err != nil {
logger.Error("load recipe ", err)
}
})
readDelta(r.versions[i], filesName, utils.NopReadWrapper, func(rc io.ReadCloser) {
fileList, err = io.ReadAll(rc)
if err != nil {
logger.Error("load files ", err)
}
})
versions[i] = Version{
uint64(counter.Count()),
uint64(len(recipe)),
uint64(len(fileList)),
}
header := versions[i].createHeader()
logger.Info(header)
}
}
func (v Version) createHeader() []byte {
buf := make([]byte, binary.MaxVarintLen64*3)
i := 0
for _, x := range []uint64{v.Chunks, v.Recipe, v.Files} {
n := binary.PutUvarint(buf[i:], x)
i += n
}
return buf[:i]
}
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