forked from gitea/gitea
98 lines
2.2 KiB
Go
98 lines
2.2 KiB
Go
// Copyright 2014 The ql Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSES/QL-LICENSE file.
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// Copyright 2015 PingCAP, Inc.
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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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// See the License for the specific language governing permissions and
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// limitations under the License.
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package util
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import (
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"bytes"
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"github.com/juju/errors"
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"github.com/pingcap/tidb/kv"
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)
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// ScanMetaWithPrefix scans metadata with the prefix.
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func ScanMetaWithPrefix(retriever kv.Retriever, prefix kv.Key, filter func(kv.Key, []byte) bool) error {
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iter, err := retriever.Seek(prefix)
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if err != nil {
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return errors.Trace(err)
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}
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defer iter.Close()
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for {
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if err != nil {
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return errors.Trace(err)
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}
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if iter.Valid() && iter.Key().HasPrefix(prefix) {
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if !filter(iter.Key(), iter.Value()) {
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break
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}
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err = iter.Next()
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if err != nil {
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return errors.Trace(err)
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}
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} else {
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break
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}
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}
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return nil
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}
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// DelKeyWithPrefix deletes keys with prefix.
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func DelKeyWithPrefix(rm kv.RetrieverMutator, prefix kv.Key) error {
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var keys []kv.Key
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iter, err := rm.Seek(prefix)
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if err != nil {
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return errors.Trace(err)
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}
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defer iter.Close()
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for {
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if err != nil {
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return errors.Trace(err)
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}
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if iter.Valid() && iter.Key().HasPrefix(prefix) {
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keys = append(keys, iter.Key().Clone())
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err = iter.Next()
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if err != nil {
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return errors.Trace(err)
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}
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} else {
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break
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}
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}
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for _, key := range keys {
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err := rm.Delete(key)
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if err != nil {
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return errors.Trace(err)
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}
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}
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return nil
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}
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// RowKeyPrefixFilter returns a function which checks whether currentKey has decoded rowKeyPrefix as prefix.
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func RowKeyPrefixFilter(rowKeyPrefix kv.Key) kv.FnKeyCmp {
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return func(currentKey kv.Key) bool {
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// Next until key without prefix of this record.
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return !bytes.HasPrefix(currentKey, rowKeyPrefix)
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}
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}
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