tidb util 源码
tidb util 代码
文件路径：/store/mockstore/unistore/tikv/util.go
// Copyright 2019-present 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,
// 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 tikv
import (
"bytes"
"github.com/dgryski/go-farm"
"github.com/pingcap/badger/y"
"github.com/pingcap/kvproto/pkg/kvrpcpb"
"golang.org/x/exp/slices"
)
func exceedEndKey(current, endKey []byte) bool {
if len(endKey) == 0 {
return false
}
return bytes.Compare(current, endKey) >= 0
}
// SortAndDedupHashVals will change hashVals into sort ascending order and remove duplicates
func sortAndDedupHashVals(hashVals []uint64) []uint64 {
if len(hashVals) > 1 {
slices.Sort(hashVals)
idx := 0
for i, v := range hashVals {
if i > 0 && hashVals[i] == hashVals[i-1] {
continue
}
hashVals[idx] = v
idx++
}
hashVals = hashVals[0:idx]
}
return hashVals
}
func mutationsToHashVals(mutations []*kvrpcpb.Mutation) []uint64 {
hashVals := make([]uint64, len(mutations))
for i, mut := range mutations {
hashVals[i] = farm.Fingerprint64(mut.Key)
}
hashVals = sortAndDedupHashVals(hashVals)
return hashVals
}
func keysToHashVals(keys ...[]byte) []uint64 {
hashVals := make([]uint64, len(keys))
for i, key := range keys {
hashVals[i] = farm.Fingerprint64(key)
}
hashVals = sortAndDedupHashVals(hashVals)
return hashVals
}
func userKeysToHashVals(keys ...y.Key) []uint64 {
hashVals := make([]uint64, len(keys))
for i, key := range keys {
hashVals[i] = farm.Fingerprint64(key.UserKey)
}
hashVals = sortAndDedupHashVals(hashVals)
return hashVals
}
func safeCopy(b []byte) []byte {
return append([]byte{}, b...)
}
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