tidb checksum 源码
tidb checksum 代码
文件路径：/br/pkg/lightning/verification/checksum.go
// Copyright 2019 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 verification
import (
"fmt"
"hash/crc64"
"github.com/pingcap/tidb/br/pkg/lightning/common"
"go.uber.org/zap/zapcore"
)
var ecmaTable = crc64.MakeTable(crc64.ECMA)
type KVChecksum struct {
bytes uint64
kvs uint64
checksum uint64
}
func NewKVChecksum(checksum uint64) *KVChecksum {
return &KVChecksum{
checksum: checksum,
}
}
func MakeKVChecksum(bytes uint64, kvs uint64, checksum uint64) KVChecksum {
return KVChecksum{
bytes: bytes,
kvs: kvs,
checksum: checksum,
}
}
func (c *KVChecksum) UpdateOne(kv common.KvPair) {
sum := crc64.Update(0, ecmaTable, kv.Key)
sum = crc64.Update(sum, ecmaTable, kv.Val)
c.bytes += uint64(len(kv.Key) + len(kv.Val))
c.kvs++
c.checksum ^= sum
}
func (c *KVChecksum) Update(kvs []common.KvPair) {
var (
checksum uint64
sum uint64
kvNum int
bytes int
)
for _, pair := range kvs {
sum = crc64.Update(0, ecmaTable, pair.Key)
sum = crc64.Update(sum, ecmaTable, pair.Val)
checksum ^= sum
kvNum++
bytes += (len(pair.Key) + len(pair.Val))
}
c.bytes += uint64(bytes)
c.kvs += uint64(kvNum)
c.checksum ^= checksum
}
func (c *KVChecksum) Add(other *KVChecksum) {
c.bytes += other.bytes
c.kvs += other.kvs
c.checksum ^= other.checksum
}
func (c *KVChecksum) Sum() uint64 {
return c.checksum
}
func (c *KVChecksum) SumSize() uint64 {
return c.bytes
}
func (c *KVChecksum) SumKVS() uint64 {
return c.kvs
}
// MarshalLogObject implements the zapcore.ObjectMarshaler interface.
func (c *KVChecksum) MarshalLogObject(encoder zapcore.ObjectEncoder) error {
encoder.AddUint64("cksum", c.checksum)
encoder.AddUint64("size", c.bytes)
encoder.AddUint64("kvs", c.kvs)
return nil
}
// MarshalJSON implements the json.Marshaler interface.
func (c KVChecksum) MarshalJSON() ([]byte, error) {
result := fmt.Sprintf(`{"checksum":%d,"size":%d,"kvs":%d}`, c.checksum, c.bytes, c.kvs)
return []byte(result), nil
}
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