84 lines
1.9 KiB
Go
84 lines
1.9 KiB
Go
// Copyright 2015 The Cayley Authors. All rights reserved.
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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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package bolt
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import (
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"fmt"
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"github.com/barakmich/glog"
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"github.com/boltdb/bolt"
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"github.com/google/cayley/graph"
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)
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const latestDataVersion = 1
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const nilDataVersion = 1
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type upgradeFunc func(*bolt.DB) error
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var migrateFunctions = []upgradeFunc{
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nil,
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upgrade1To2,
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}
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func upgradeBolt(path string, opts graph.Options) error {
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db, err := bolt.Open(path, 0600, nil)
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defer db.Close()
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if err != nil {
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glog.Errorln("Error, couldn't open! ", err)
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return err
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}
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var version int64
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err = db.View(func(tx *bolt.Tx) error {
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version, err = getInt64ForMetaKey(tx, "version", nilDataVersion)
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return err
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})
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if err != nil {
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glog.Errorln("error:", err)
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return err
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}
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if version == latestDataVersion {
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fmt.Printf("Already at latest version: %d\n", latestDataVersion)
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return nil
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}
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if version > latestDataVersion {
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err := fmt.Errorf("Unknown data version: %d -- upgrade this tool", version)
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glog.Errorln("error:", err)
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return err
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}
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for i := version; i < latestDataVersion; i++ {
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err := migrateFunctions[i](db)
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if err != nil {
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return err
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}
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}
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return nil
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}
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func upgrade1To2(db *bolt.DB) error {
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fmt.Println("Upgrading v1 to v2...")
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tx, err := db.Begin(true)
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if err != nil {
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return err
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}
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defer tx.Rollback()
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if err := tx.Commit(); err != nil {
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return err
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}
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return nil
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}
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