mirror of
https://github.com/etcd-io/etcd.git
synced 2024-09-27 06:25:44 +00:00
51 lines
1.3 KiB
Go
51 lines
1.3 KiB
Go
// Copyright 2021 The etcd Authors
|
|
//
|
|
// 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 schema
|
|
|
|
import "go.etcd.io/etcd/server/v3/storage/backend"
|
|
|
|
type schemaChange interface {
|
|
upgradeAction() action
|
|
downgradeAction() action
|
|
}
|
|
|
|
// addNewField represents adding new field when upgrading. Downgrade will remove the field.
|
|
func addNewField(bucket backend.Bucket, fieldName []byte, fieldValue []byte) schemaChange {
|
|
return simpleSchemaChange{
|
|
upgrade: setKeyAction{
|
|
Bucket: bucket,
|
|
FieldName: fieldName,
|
|
FieldValue: fieldValue,
|
|
},
|
|
downgrade: deleteKeyAction{
|
|
Bucket: bucket,
|
|
FieldName: fieldName,
|
|
},
|
|
}
|
|
}
|
|
|
|
type simpleSchemaChange struct {
|
|
upgrade action
|
|
downgrade action
|
|
}
|
|
|
|
func (c simpleSchemaChange) upgradeAction() action {
|
|
return c.upgrade
|
|
}
|
|
|
|
func (c simpleSchemaChange) downgradeAction() action {
|
|
return c.downgrade
|
|
}
|