99 lines
2.5 KiB
Go
99 lines
2.5 KiB
Go
// 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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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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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 kv
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import (
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"context"
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"strconv"
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"github.com/pingcap/errors"
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"github.com/pingcap/tidb/pkg/config/kerneltype"
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"github.com/pingcap/tidb/pkg/keyspace"
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)
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// IncInt64 increases the value for key k in kv store by step.
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func IncInt64(rm RetrieverMutator, k Key, step int64) (int64, error) {
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val, err := rm.Get(context.TODO(), k)
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if IsErrNotFound(err) {
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err = rm.Set(k, []byte(strconv.FormatInt(step, 10)))
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if err != nil {
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return 0, err
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}
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return step, nil
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}
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if err != nil {
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return 0, err
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}
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intVal, err := strconv.ParseInt(string(val.Value), 10, 64)
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if err != nil {
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return 0, errors.Trace(err)
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}
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intVal += step
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err = rm.Set(k, []byte(strconv.FormatInt(intVal, 10)))
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if err != nil {
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return 0, err
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}
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return intVal, nil
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}
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// GetInt64 get int64 value which created by IncInt64 method.
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func GetInt64(ctx context.Context, r Retriever, k Key) (int64, error) {
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val, err := r.Get(ctx, k)
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if IsErrNotFound(err) {
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return 0, nil
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}
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if err != nil {
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return 0, err
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}
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intVal, err := strconv.ParseInt(string(val.Value), 10, 64)
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if err != nil {
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return intVal, errors.Trace(err)
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}
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return intVal, nil
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}
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// WalkMemBuffer iterates all buffered kv pairs in memBuf
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func WalkMemBuffer(memBuf Retriever, f func(k Key, v []byte) error) error {
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iter, err := memBuf.Iter(nil, nil)
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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 iter.Valid() {
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if err = f(iter.Key(), iter.Value()); err != nil {
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return errors.Trace(err)
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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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}
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return nil
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}
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// IsUserKS checks if the store is running on a user keyspace.
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func IsUserKS(store Storage) bool {
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return kerneltype.IsNextGen() && store.GetKeyspace() != keyspace.System
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}
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// IsSystemKS checks if the store is running on the SYSTEM keyspace.
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func IsSystemKS(store Storage) bool {
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return kerneltype.IsNextGen() && store.GetKeyspace() == keyspace.System
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}
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