109 lines
2.3 KiB
Go
109 lines
2.3 KiB
Go
// Copyright (c) 2015 Couchbase, Inc.
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// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
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// except in compliance with the License. You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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// Unless required by applicable law or agreed to in writing, software distributed under the
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// License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
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// either express or implied. See the License for the specific language governing permissions
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// and limitations under the License.
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package firestorm
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import (
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"fmt"
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"github.com/golang/protobuf/proto"
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"github.com/blevesearch/bleve/index/store"
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)
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const Version uint64 = 1
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var IncompatibleVersion = fmt.Errorf("incompatible version, %d is supported", Version)
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var VersionKey = []byte{'v'}
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type VersionRow struct {
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value VersionValue
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}
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func NewVersionRow(version uint64) *VersionRow {
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rv := VersionRow{}
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rv.value.Version = proto.Uint64(version)
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return &rv
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}
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func NewVersionRowV(val []byte) (*VersionRow, error) {
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rv := VersionRow{}
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err := rv.value.Unmarshal(val)
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if err != nil {
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return nil, err
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}
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return &rv, nil
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}
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func (vr *VersionRow) KeySize() int {
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return 1
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}
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func (vr *VersionRow) KeyTo(buf []byte) (int, error) {
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buf[0] = VersionKey[0]
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return 1, nil
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}
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func (vr *VersionRow) Key() []byte {
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return VersionKey
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}
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func (vr *VersionRow) ValueSize() int {
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return vr.value.Size()
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}
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func (vr *VersionRow) ValueTo(buf []byte) (int, error) {
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return vr.value.MarshalTo(buf)
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}
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func (vr *VersionRow) Value() []byte {
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buf := make([]byte, vr.ValueSize())
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n, _ := vr.value.MarshalTo(buf)
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return buf[:n]
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}
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func (vr *VersionRow) Version() uint64 {
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return vr.value.GetVersion()
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}
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func (f *Firestorm) checkVersion(reader store.KVReader) (newIndex bool, err error) {
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value, err := reader.Get(VersionKey)
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if err != nil {
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return
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}
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if value == nil {
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newIndex = true
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return
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}
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var vr *VersionRow
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vr, err = NewVersionRowV(value)
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if err != nil {
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return
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}
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// assert correct version
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if vr.Version() != Version {
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err = IncompatibleVersion
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return
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}
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return
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}
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func (f *Firestorm) storeVersion(writer store.KVWriter) error {
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vr := NewVersionRow(Version)
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wb := writer.NewBatch()
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wb.Set(vr.Key(), vr.Value())
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err := writer.ExecuteBatch(wb)
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return err
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}
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