tidb utils 源码
tidb utils 代码
文件路径：/kv/utils.go
// 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,
// 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 kv
import (
"context"
"strconv"
"github.com/pingcap/errors"
)
// IncInt64 increases the value for key k in kv store by step.
func IncInt64(rm RetrieverMutator, k Key, step int64) (int64, error) {
val, err := rm.Get(context.TODO(), k)
if IsErrNotFound(err) {
err = rm.Set(k, []byte(strconv.FormatInt(step, 10)))
if err != nil {
return 0, err
}
return step, nil
}
if err != nil {
return 0, err
}
intVal, err := strconv.ParseInt(string(val), 10, 64)
if err != nil {
return 0, errors.Trace(err)
}
intVal += step
err = rm.Set(k, []byte(strconv.FormatInt(intVal, 10)))
if err != nil {
return 0, err
}
return intVal, nil
}
// GetInt64 get int64 value which created by IncInt64 method.
func GetInt64(ctx context.Context, r Retriever, k Key) (int64, error) {
val, err := r.Get(ctx, k)
if IsErrNotFound(err) {
return 0, nil
}
if err != nil {
return 0, err
}
intVal, err := strconv.ParseInt(string(val), 10, 64)
if err != nil {
return intVal, errors.Trace(err)
}
return intVal, nil
}
// WalkMemBuffer iterates all buffered kv pairs in memBuf
func WalkMemBuffer(memBuf Retriever, f func(k Key, v []byte) error) error {
iter, err := memBuf.Iter(nil, nil)
if err != nil {
return errors.Trace(err)
}
defer iter.Close()
for iter.Valid() {
if err = f(iter.Key(), iter.Value()); err != nil {
return errors.Trace(err)
}
err = iter.Next()
if err != nil {
return errors.Trace(err)
}
}
return nil
}
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