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migrate.go
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/
migrate.go
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// Copyright 2015 The Cayley Authors. All rights reserved.
//
// 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 leveldb
import (
"encoding/json"
"fmt"
"strconv"
"github.com/cayleygraph/cayley/clog"
"github.com/cayleygraph/cayley/graph"
"github.com/cayleygraph/cayley/graph/proto"
"github.com/cayleygraph/cayley/quad"
"github.com/cayleygraph/cayley/quad/pquads"
"github.com/syndtr/goleveldb/leveldb"
"github.com/syndtr/goleveldb/leveldb/opt"
"github.com/syndtr/goleveldb/leveldb/util"
)
const latestDataVersion = 2
const nilDataVersion = 1
type upgradeFunc func(*leveldb.DB) error
var migrateFunctions = []upgradeFunc{
nil,
upgrade1To2,
}
func upgradeLevelDB(path string, opts graph.Options) error {
db, err := leveldb.OpenFile(path, &opt.Options{})
defer db.Close()
if err != nil {
clog.Errorf("Error, couldn't open! %v", err)
return err
}
version, err := getVersion(db)
if err != nil {
clog.Errorf("error: %v", err)
return err
}
if version == latestDataVersion {
fmt.Printf("Already at latest version: %d\n", latestDataVersion)
return nil
}
if version > latestDataVersion {
err := fmt.Errorf("Unknown data version: %d -- upgrade this tool", version)
clog.Errorf("error: %v", err)
return err
}
for i := version; i < latestDataVersion; i++ {
err := migrateFunctions[i](db)
if err != nil {
return err
}
setVersion(db, i+1, nil)
}
return nil
}
func upgrade1To2(db *leveldb.DB) error {
fmt.Println("Upgrading v1 to v2...")
type v1IndexEntry struct {
Subject string `json:"subject"`
Predicate string `json:"predicate"`
Object string `json:"object"`
Label string `json:"label,omitempty"`
History []int64 `json:"History"`
}
type v1ValueData struct {
Name string `json:"Name"`
Size int64 `json:"Size"`
}
var (
spoPref = []byte{spo[0].Prefix(), spo[1].Prefix()}
ospPref = []byte{osp[0].Prefix(), osp[1].Prefix()}
posPref = []byte{pos[0].Prefix(), pos[1].Prefix()}
cpsPref = []byte{cps[0].Prefix(), cps[1].Prefix()}
)
{
fmt.Println("Upgrading bucket z")
it := db.NewIterator(&util.Range{Start: []byte{'z'}, Limit: []byte{'z' + 1}}, nil)
for it.Next() {
k, v := it.Key(), it.Value()
var val v1ValueData
if err := json.Unmarshal(v, &val); err != nil {
return err
}
node := proto.NodeData{
Size: val.Size,
Value: pquads.MakeValue(quad.Raw(val.Name)),
}
nv, err := node.Marshal()
if err != nil {
return err
}
if err = db.Put(k, nv, nil); err != nil {
return err
}
}
it.Release()
}
for _, pref := range [4][]byte{spoPref, ospPref, posPref, cpsPref} {
fmt.Println("Upgrading bucket", string(pref))
end := []byte{pref[0], pref[1] + 1}
it := db.NewIterator(&util.Range{Start: pref, Limit: end}, nil)
for it.Next() {
k, v := it.Key(), it.Value()
var entry v1IndexEntry
if err := json.Unmarshal(v, &entry); err != nil {
return err
}
var h proto.HistoryEntry
h.History = make([]uint64, len(entry.History))
for i, id := range entry.History {
h.History[i] = uint64(id)
}
nv, err := h.Marshal()
if err != nil {
return err
}
if err = db.Put(k, nv, nil); err != nil {
return err
}
}
it.Release()
}
{
fmt.Println("Upgrading bucket d")
it := db.NewIterator(&util.Range{Start: []byte{'d'}, Limit: []byte{'d' + 1}}, nil)
for it.Next() {
k, v := it.Key(), it.Value()
id, err := strconv.ParseInt(string(k[1:]), 16, 64)
if err != nil {
return err
}
nk := createDeltaKeyFor(id)
var val graph.Delta
if err := json.Unmarshal(v, &val); err != nil {
return err
}
p := deltaToProto(val)
nv, err := p.Marshal()
if err != nil {
return err
}
b := &leveldb.Batch{}
b.Put(nk, nv)
b.Delete(k)
if err = db.Write(b, nil); err != nil {
return err
}
}
it.Release()
}
return nil
}