/
segment_range.go
147 lines (127 loc) · 3.32 KB
/
segment_range.go
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// Copyright 2018 vip.com.
//
// 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,
// See the License for the specific language governing permissions and
// limitations under the License.
package logstore
import (
"encoding/json"
"io/ioutil"
"sync"
"path"
"github.com/coreos/etcd/pkg/fileutil"
"github.com/vipshop/vdl/pkg/glog"
)
var (
segmentRangeFile = "segment_range_meta.json"
)
type RangeFile struct {
// the dir of range metadata file
rangeFilePath string
l sync.Mutex
}
type RangeInfo struct {
//key is segment name, value is index range
NameToRange map[string]*LogRange `json:"range"`
}
type LogRange struct {
FirstVindex int64 `json:"first_vindex"`
FirstRindex uint64 `json:"first_rindex"`
LastVindex int64 `json:"last_vindex"`
LastRindex uint64 `json:"last_rindex"`
}
func NewRangeFile(dir string) *RangeFile {
if len(dir) == 0 {
glog.Fatal("[segment_range.go-NewRangeFile]:dir is nil")
}
r := &RangeFile{
rangeFilePath: path.Join(dir, segmentRangeFile),
}
return r
}
func (m *RangeFile) GetRangeInfo() (*RangeInfo, error) {
m.l.Lock()
defer m.l.Unlock()
var rangeInfo RangeInfo
rangeInfo.NameToRange = make(map[string]*LogRange)
if IsFileExist(m.rangeFilePath) {
data, err := ioutil.ReadFile(m.rangeFilePath)
if err != nil {
return nil, err
}
if err := json.Unmarshal(data, &rangeInfo); err != nil {
return nil, err
}
}
return &rangeInfo, nil
}
func (m *RangeFile) AppendLogRange(segmentName string, l *LogRange) error {
m.l.Lock()
defer m.l.Unlock()
if len(segmentName) == 0 {
glog.Warningf("[segment_range.go-AppendLogRange]:segmentName is nil")
return nil
}
var rangeInfo RangeInfo
rangeInfo.NameToRange = make(map[string]*LogRange)
if IsFileExist(m.rangeFilePath) {
data, err := ioutil.ReadFile(m.rangeFilePath)
if err != nil {
return err
}
if err := json.Unmarshal(data, &rangeInfo); err != nil {
return err
}
}
//追加新的segment range meta
rangeInfo.NameToRange[segmentName] = l
//写文件
resultBuf, err := json.Marshal(rangeInfo)
if err != nil {
return err
}
err = ioutil.WriteFile(m.rangeFilePath, resultBuf, fileutil.PrivateFileMode)
if err != nil {
return err
}
return nil
}
func (m *RangeFile) DeleteLogRanges(deleteSegments []string) error {
m.l.Lock()
defer m.l.Unlock()
var rangeInfo RangeInfo
rangeInfo.NameToRange = make(map[string]*LogRange)
if IsFileExist(m.rangeFilePath) == false {
glog.Warningf("[segment_range.go-AppendLogRange]: segment range metadata file not exist,path=%s", m.rangeFilePath)
return nil
} else {
data, err := ioutil.ReadFile(m.rangeFilePath)
if err != nil {
return err
}
if err := json.Unmarshal(data, &rangeInfo); err != nil {
return err
}
}
//删除segment metadata
for _, name := range deleteSegments {
delete(rangeInfo.NameToRange, name)
}
//写文件
resultBuf, err := json.Marshal(rangeInfo)
if err != nil {
return err
}
err = ioutil.WriteFile(m.rangeFilePath, resultBuf, fileutil.PrivateFileMode)
if err != nil {
return err
}
return nil
}