/
backup.go
81 lines (68 loc) · 1.95 KB
/
backup.go
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/*
* Copyright 2017 Dgraph Labs, Inc. and Contributors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package cmd
import (
"bufio"
"os"
"github.com/dgraph-io/badger/v2"
"github.com/spf13/cobra"
)
var backupFile string
var truncate bool
// backupCmd represents the backup command
var backupCmd = &cobra.Command{
Use: "backup",
Short: "Backup Badger database.",
Long: `Backup Badger database to a file in a version-agnostic manner.
Iterates over each key-value pair, encodes it along with its metadata and
version in protocol buffers and writes them to a file. This file can later be
used by the restore command to create an identical copy of the
database.`,
RunE: doBackup,
}
func init() {
RootCmd.AddCommand(backupCmd)
backupCmd.Flags().StringVarP(&backupFile, "backup-file", "f",
"badger.bak", "File to backup to")
backupCmd.Flags().BoolVarP(&truncate, "truncate", "t",
false, "Allow value log truncation if required.")
}
func doBackup(cmd *cobra.Command, args []string) error {
// Open DB
db, err := badger.Open(badger.DefaultOptions(sstDir).
WithValueDir(vlogDir).
WithTruncate(truncate))
if err != nil {
return err
}
defer db.Close()
// Create File
f, err := os.Create(backupFile)
if err != nil {
return err
}
bw := bufio.NewWriterSize(f, 64<<20)
if _, err = db.Backup(bw, 0); err != nil {
return err
}
if err = bw.Flush(); err != nil {
return err
}
if err = f.Sync(); err != nil {
return err
}
return f.Close()
}