mirror of
https://github.com/luxfi/zapdb.git
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Joshua GoldsteinandGitHub
16029189f0
Changelog should reflect that we are switching to SemVer. This requires moving to a new major version. We also update all import paths in Badger.
88 lines
2.4 KiB
Go
88 lines
2.4 KiB
Go
/*
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* Copyright 2017 Dgraph Labs, Inc. and Contributors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package cmd
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import (
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"errors"
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"math"
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"os"
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"path/filepath"
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"github.com/spf13/cobra"
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"github.com/dgraph-io/badger/v4"
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)
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var restoreFile string
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var maxPendingWrites int
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// restoreCmd represents the restore command
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var restoreCmd = &cobra.Command{
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Use: "restore",
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Short: "Restore Badger database.",
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Long: `Restore Badger database from a file.
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It reads a file generated using the backup command (or by calling the
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DB.Backup() API method) and writes each key-value pair found in the file to
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the Badger database.
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Restore creates a new database, and currently does not work on an already
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existing database.`,
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RunE: doRestore,
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}
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func init() {
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RootCmd.AddCommand(restoreCmd)
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restoreCmd.Flags().StringVarP(&restoreFile, "backup-file", "f",
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"badger.bak", "File to restore from")
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// Default value for maxPendingWrites is 256, to minimise memory usage
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// and overall finish time.
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restoreCmd.Flags().IntVarP(&maxPendingWrites, "max-pending-writes", "w",
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256, "Max number of pending writes at any time while restore")
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}
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func doRestore(cmd *cobra.Command, args []string) error {
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// Check if the DB already exists
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manifestFile := filepath.Join(sstDir, badger.ManifestFilename)
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if _, err := os.Stat(manifestFile); err == nil { // No error. File already exists.
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return errors.New("Cannot restore to an already existing database")
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} else if os.IsNotExist(err) {
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// pass
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} else { // Return an error if anything other than the error above
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return err
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}
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// Open DB
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db, err := badger.Open(badger.DefaultOptions(sstDir).
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WithValueDir(vlogDir).
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WithNumVersionsToKeep(math.MaxInt32))
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if err != nil {
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return err
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}
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defer db.Close()
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// Open File
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f, err := os.Open(restoreFile)
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if err != nil {
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return err
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}
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defer f.Close()
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// Run restore
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return db.Load(f, maxPendingWrites)
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}
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