b6a95a8cb3
* Dropped unused codekit config * Integrated dynamic and static bindata for public * Ignore public bindata * Add a general generate make task * Integrated flexible public assets into web command * Updated vendoring, added all missiong govendor deps * Made the linter happy with the bindata and dynamic code * Moved public bindata definition to modules directory * Ignoring the new bindata path now * Updated to the new public modules import path * Updated public bindata command and drop the new prefix
98 lines
2.2 KiB
Go
98 lines
2.2 KiB
Go
// Copyright 2014 The ql Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSES/QL-LICENSE file.
|
|
|
|
// Copyright 2015 PingCAP, Inc.
|
|
//
|
|
// 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,
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
package util
|
|
|
|
import (
|
|
"bytes"
|
|
|
|
"github.com/juju/errors"
|
|
"github.com/pingcap/tidb/kv"
|
|
)
|
|
|
|
// ScanMetaWithPrefix scans metadata with the prefix.
|
|
func ScanMetaWithPrefix(retriever kv.Retriever, prefix kv.Key, filter func(kv.Key, []byte) bool) error {
|
|
iter, err := retriever.Seek(prefix)
|
|
if err != nil {
|
|
return errors.Trace(err)
|
|
}
|
|
defer iter.Close()
|
|
|
|
for {
|
|
if err != nil {
|
|
return errors.Trace(err)
|
|
}
|
|
|
|
if iter.Valid() && iter.Key().HasPrefix(prefix) {
|
|
if !filter(iter.Key(), iter.Value()) {
|
|
break
|
|
}
|
|
err = iter.Next()
|
|
if err != nil {
|
|
return errors.Trace(err)
|
|
}
|
|
} else {
|
|
break
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// DelKeyWithPrefix deletes keys with prefix.
|
|
func DelKeyWithPrefix(rm kv.RetrieverMutator, prefix kv.Key) error {
|
|
var keys []kv.Key
|
|
iter, err := rm.Seek(prefix)
|
|
if err != nil {
|
|
return errors.Trace(err)
|
|
}
|
|
|
|
defer iter.Close()
|
|
for {
|
|
if err != nil {
|
|
return errors.Trace(err)
|
|
}
|
|
|
|
if iter.Valid() && iter.Key().HasPrefix(prefix) {
|
|
keys = append(keys, iter.Key().Clone())
|
|
err = iter.Next()
|
|
if err != nil {
|
|
return errors.Trace(err)
|
|
}
|
|
} else {
|
|
break
|
|
}
|
|
}
|
|
|
|
for _, key := range keys {
|
|
err := rm.Delete(key)
|
|
if err != nil {
|
|
return errors.Trace(err)
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// RowKeyPrefixFilter returns a function which checks whether currentKey has decoded rowKeyPrefix as prefix.
|
|
func RowKeyPrefixFilter(rowKeyPrefix kv.Key) kv.FnKeyCmp {
|
|
return func(currentKey kv.Key) bool {
|
|
// Next until key without prefix of this record.
|
|
return !bytes.HasPrefix(currentKey, rowKeyPrefix)
|
|
}
|
|
}
|