/
mmap_file.go
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/
mmap_file.go
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// Copyright 2018 The kingbus Authors
//
// 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 storage
import (
"encoding/binary"
"hash/crc32"
"os"
"path"
"syscall"
"github.com/coreos/etcd/pkg/fileutil"
"github.com/flike/kingbus/log"
"github.com/flike/kingbus/storage/storagepb"
"github.com/flike/kingbus/utils"
"github.com/coreos/etcd/raft/raftpb"
)
//MmapFile is the file mmaped in os
type MmapFile struct {
file *os.File
filePath string
mappedData []byte
writePosition int
syncPosition int
maxBytes int
}
func newMmapFile(dir string, name string, fileSize int64) *MmapFile {
var err error
f := new(MmapFile)
f.filePath = path.Join(dir, name)
f.file, err = os.OpenFile(f.filePath, os.O_RDWR|os.O_CREATE|os.O_EXCL, FileMode)
if err != nil {
log.Log.Fatalf("OpenFile error,err:%s,filePath:%s", err, f.filePath)
}
err = fileutil.Preallocate(f.file, fileSize, true)
if err != nil {
log.Log.Fatalf("Preallocate error,err:%s,filePath:%s,fileSize:%d", err, f.filePath, fileSize)
}
f.mappedData, err = syscall.Mmap(int(f.file.Fd()), 0, int(fileSize),
syscall.PROT_READ|syscall.PROT_WRITE, syscall.MAP_SHARED|syscall.MAP_NORESERVE)
if err != nil {
log.Log.Fatalf("Mmap error,err:%s,filePath:%s,fileSize:%d", err, f.filePath, fileSize)
}
f.writePosition = 0
f.syncPosition = 0
f.maxBytes = int(fileSize)
return f
}
func openMmapFile(dir string, name string) *MmapFile {
var err error
f := new(MmapFile)
f.filePath = path.Join(dir, name)
f.file, err = os.OpenFile(f.filePath, os.O_RDWR, FileMode)
if err != nil {
log.Log.Fatalf("OpenFile error,err:%s,filePath:%s", err, f.filePath)
}
fileInfo, err := f.file.Stat()
if err != nil {
log.Log.Fatalf("Stat error,err:%s,filePath:%s", err, f.filePath)
}
fileSize := fileInfo.Size()
err = fileutil.Preallocate(f.file, fileSize, true)
if err != nil {
log.Log.Fatalf("Preallocate error,err:%s,filePath:%s,fileSize:%d", err, f.filePath, fileSize)
}
f.mappedData, err = syscall.Mmap(int(f.file.Fd()), 0, int(fileSize),
syscall.PROT_READ|syscall.PROT_WRITE, syscall.MAP_SHARED|syscall.MAP_NORESERVE)
if err != nil {
log.Log.Fatalf("Mmap error,err:%s,filePath:%s,fileSize:%d", err, f.filePath, fileSize)
}
f.writePosition = 0
f.syncPosition = 0
f.maxBytes = int(fileInfo.Size())
return f
}
func (f *MmapFile) append(data []byte) (int, error) {
var startPos int
startPos = f.writePosition
copy(f.mappedData[startPos:startPos+int(len(data))], data)
f.writePosition += len(data)
return startPos, nil
}
func (f *MmapFile) sync() error {
err := utils.Syncfilerange(
f.file.Fd(),
int64(f.syncPosition),
int64(f.writePosition-f.syncPosition),
utils.SYNC_FILE_RANGE_WAIT_BEFORE|utils.SYNC_FILE_RANGE_WRITE|utils.SYNC_FILE_RANGE_WAIT_AFTER,
)
if err != nil {
log.Log.Errorf("Syncfilerange error,err:%s,file:%s",
err, f.file.Name())
return err
}
f.syncPosition = f.writePosition
return nil
}
func (f *MmapFile) setPosition(position int) {
if position < 0 {
log.Log.Fatalf("setPosition error,position is %d", position)
}
f.writePosition = position
f.syncPosition = position
}
func (f *MmapFile) readRaftEntry(position int) (raftpb.Entry, int) {
var record storagepb.Record
var entry raftpb.Entry
recordLen := binary.LittleEndian.Uint32(f.mappedData[position : position+RecordLengthSize])
position += RecordLengthSize
endPosition := position + int(recordLen)
recordBuf := f.mappedData[position:endPosition]
err := record.Unmarshal(recordBuf)
if err != nil {
log.Log.Fatalf("record Unmarshal error,err:%s,buf:%v", err, recordBuf)
}
crc := crc32.ChecksumIEEE(record.Data)
if crc != record.Crc {
log.Log.Fatalf("crc not equal,record.crc:%d,calculatedCrc:%d,buf:%v", record.Crc, crc, recordBuf)
}
err = entry.Unmarshal(record.Data)
if err != nil {
log.Log.Fatalf("entry Unmarshal error,err:%s,buf:%v", err, record.Data)
}
return entry, endPosition
}
func (f *MmapFile) readIndexEntry(position int) *IndexEntry {
var entry IndexEntry
indexEntryBuf := f.mappedData[position : position+IndexEntrySize]
err := entry.Unmarshal(indexEntryBuf)
if err != nil {
log.Log.Fatalf("index entry Unmarshal error,err:%s,buf:%v", err, indexEntryBuf)
}
return &entry
}
func (f *MmapFile) close() error {
err := syscall.Munmap(f.mappedData)
if err != nil {
log.Log.Errorf("Munmap error,err:%s,file:%s", err, f.file.Name())
return err
}
err = f.file.Close()
if err != nil {
log.Log.Errorf("Close error,err:%s,file:%s", err, f.file.Name())
return err
}
return nil
}
func (f *MmapFile) remove() error {
err := f.close()
if err != nil {
log.Log.Errorf("close error,err:%s,file:%s", err, f.file.Name())
return err
}
err = os.Remove(f.filePath)
if err != nil {
return err
}
return nil
}
func (f *MmapFile) truncateSuffix(position int) error {
if f.writePosition < position {
return ErrOutOfBound
}
zeroDataLen := f.writePosition - position
zeroBuf := make([]byte, zeroDataLen)
copy(f.mappedData[position:position+zeroDataLen], zeroBuf)
err := utils.Syncfilerange(
f.file.Fd(),
int64(position),
int64(zeroDataLen),
utils.SYNC_FILE_RANGE_WAIT_BEFORE|utils.SYNC_FILE_RANGE_WRITE|utils.SYNC_FILE_RANGE_WAIT_AFTER,
)
if err != nil {
log.Log.Errorf("Syncfilerange error,err=%s,position=%d,length=%d",
err, position, zeroDataLen)
return err
}
f.writePosition = position
f.syncPosition = position
return nil
}
func (f *MmapFile) rename(name string) error {
dir := path.Dir(f.filePath)
newPath := path.Join(dir, name)
err := os.Rename(f.filePath, newPath)
if err != nil {
return err
}
f.filePath = newPath
return nil
}