61 lines
1.5 KiB
Go
61 lines
1.5 KiB
Go
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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 kv
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import (
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"strconv"
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"github.com/juju/errors"
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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(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, errors.Trace(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, errors.Trace(err)
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}
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intVal, err := strconv.ParseInt(string(val), 10, 0)
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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, errors.Trace(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(r Retriever, k Key) (int64, error) {
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val, err := r.Get(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, errors.Trace(err)
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}
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intVal, err := strconv.ParseInt(string(val), 10, 0)
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return intVal, errors.Trace(err)
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}
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