forked from mirror/ledisdb
577 lines
11 KiB
Go
577 lines
11 KiB
Go
package rpl
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import (
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"bytes"
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"encoding/binary"
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"errors"
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"fmt"
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"github.com/edsrzf/mmap-go"
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"github.com/siddontang/go/log"
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"github.com/siddontang/go/num"
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"github.com/siddontang/go/sync2"
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"io"
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"os"
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"path"
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"reflect"
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"sync"
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"time"
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)
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var (
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magic = []byte("\x1c\x1d\xb8\x88\xff\x9e\x45\x55\x40\xf0\x4c\xda\xe0\xce\x47\xde\x65\x48\x71\x17")
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log0 = Log{0, 1, 1, []byte("ledisdb")}
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log0Data = []byte{}
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errTableNeedFlush = errors.New("write table need flush")
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errTableFrozen = errors.New("write table is frozen")
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pageSize = int64(4096)
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)
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func init() {
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log0Data, _ = log0.Marshal()
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pageSize = int64(os.Getpagesize())
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}
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const tableReaderKeepaliveInterval int64 = 30
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func fmtTableName(index int64) string {
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return fmt.Sprintf("%08d.ldb", index)
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}
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type tableReader struct {
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sync.Mutex
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name string
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index int64
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f *os.File
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m mmap.MMap
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pf *os.File
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first uint64
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last uint64
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lastTime uint32
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offsetStartPos int64
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offsetLen uint32
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lastReadTime sync2.AtomicInt64
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}
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func newTableReader(base string, index int64) (*tableReader, error) {
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t := new(tableReader)
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t.name = path.Join(base, fmtTableName(index))
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t.index = index
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var err error
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if err = t.check(); err != nil {
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log.Error("check %s error: %s, try to repair", t.name, err.Error())
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if err = t.repair(); err != nil {
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log.Error("repair %s error: %s", t.name, err.Error())
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return nil, err
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}
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}
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t.close()
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return t, nil
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}
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func (t *tableReader) Close() {
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t.Lock()
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defer t.Unlock()
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t.close()
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}
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func (t *tableReader) close() {
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if t.m != nil {
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t.m.Unmap()
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t.m = nil
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}
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if t.f != nil {
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t.f.Close()
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t.f = nil
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}
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}
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func (t *tableReader) Keepalived() bool {
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l := t.lastReadTime.Get()
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if l > 0 && time.Now().Unix()-l > tableReaderKeepaliveInterval {
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return false
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}
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return true
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}
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func (t *tableReader) getLogPos(index int) (uint32, error) {
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// if _, err := t.pf.Seek(t.offsetStartPos+int64(index*4), os.SEEK_SET); err != nil {
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// return 0, err
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// }
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// var pos uint32
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// if err := binary.Read(t.pf, binary.BigEndian, &pos); err != nil {
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// return 0, err
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// }
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// return pos, nil
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return binary.BigEndian.Uint32(t.m[index*4:]), nil
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}
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func (t *tableReader) check() error {
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var err error
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if t.f, err = os.Open(t.name); err != nil {
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return err
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}
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st, _ := t.f.Stat()
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if st.Size() < 32 {
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return fmt.Errorf("file size %d too short", st.Size())
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}
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var pos int64
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if pos, err = t.f.Seek(-32, os.SEEK_END); err != nil {
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return err
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}
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if err = binary.Read(t.f, binary.BigEndian, &t.offsetStartPos); err != nil {
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return err
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} else if t.offsetStartPos >= st.Size() {
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return fmt.Errorf("invalid offset start pos %d, file size %d", t.offsetStartPos, st.Size())
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} else if t.offsetStartPos%pageSize != 0 {
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return fmt.Errorf("invalid offset start pos %d, must page size %d multi", t.offsetStartPos, pageSize)
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}
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if err = binary.Read(t.f, binary.BigEndian, &t.offsetLen); err != nil {
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return err
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} else if int64(t.offsetLen) >= st.Size() || t.offsetLen == 0 {
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return fmt.Errorf("invalid offset len %d, file size %d", t.offsetLen, st.Size())
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} else if t.offsetLen%4 != 0 {
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return fmt.Errorf("invalid offset len %d, must 4 multiple", t.offsetLen)
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}
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if t.offsetStartPos+int64(t.offsetLen) != pos {
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return fmt.Errorf("invalid offset %d %d", t.offsetStartPos, t.offsetLen)
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}
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b := make([]byte, 20)
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if _, err = t.f.Read(b); err != nil {
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return err
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} else if !bytes.Equal(b, magic) {
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return fmt.Errorf("invalid magic data %q", b)
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}
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if t.m, err = mmap.MapRegion(t.f, int(t.offsetLen), mmap.RDONLY, 0, t.offsetStartPos); err != nil {
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return err
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}
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firstLogPos, _ := t.getLogPos(0)
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lastLogPos, _ := t.getLogPos(int(t.offsetLen/4 - 1))
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if firstLogPos != 0 {
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return fmt.Errorf("invalid first log pos %d, must 0", firstLogPos)
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} else if int64(lastLogPos) > t.offsetStartPos {
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return fmt.Errorf("invalid last log pos %d", lastLogPos)
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}
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var l Log
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if _, err = t.decodeLogHead(&l, int64(firstLogPos)); err != nil {
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return fmt.Errorf("decode first log err %s", err.Error())
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}
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t.first = l.ID
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var n int64
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if n, err = t.decodeLogHead(&l, int64(lastLogPos)); err != nil {
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return fmt.Errorf("decode last log err %s", err.Error())
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} else {
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var l0 Log
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if _, err := t.f.Seek(n, os.SEEK_SET); err != nil {
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return fmt.Errorf("seek logo err %s", err.Error())
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} else if err = l0.Decode(t.f); err != nil {
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println(lastLogPos, n, l0.ID, l0.CreateTime, l0.Compression)
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return fmt.Errorf("decode log0 err %s", err.Error())
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} else if !reflect.DeepEqual(l0, log0) {
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return fmt.Errorf("invalid log0 %#v != %#v", l0, log0)
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}
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}
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t.last = l.ID
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t.lastTime = l.CreateTime
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if t.first > t.last {
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return fmt.Errorf("invalid log table first %d > last %d", t.first, t.last)
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} else if (t.last - t.first + 1) != uint64(t.offsetLen/4) {
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return fmt.Errorf("invalid log table, first %d, last %d, and log num %d", t.first, t.last, t.offsetLen/4)
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}
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return nil
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}
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func (t *tableReader) repair() error {
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t.close()
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var err error
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if t.f, err = os.Open(t.name); err != nil {
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return err
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}
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defer t.close()
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tw := newTableWriter(path.Dir(t.name), t.index, maxLogFileSize)
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tmpName := tw.name + ".tmp"
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tw.name = tmpName
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os.Remove(tmpName)
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defer func() {
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tw.Close()
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os.Remove(tmpName)
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}()
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var l Log
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for {
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if err := l.Decode(t.f); err != nil {
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return err
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}
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if l.ID == 0 {
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break
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}
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t.lastTime = l.CreateTime
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if err := tw.StoreLog(&l); err != nil {
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return err
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}
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}
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t.close()
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var tr *tableReader
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if tr, err = tw.Flush(); err != nil {
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return err
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}
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t.first = tr.first
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t.last = tr.last
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t.offsetStartPos = tr.offsetStartPos
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t.offsetLen = tr.offsetLen
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defer tr.Close()
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os.Remove(t.name)
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if err := os.Rename(tmpName, t.name); err != nil {
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return err
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}
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return nil
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}
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func (t *tableReader) decodeLogHead(l *Log, pos int64) (int64, error) {
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_, err := t.f.Seek(int64(pos), os.SEEK_SET)
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if err != nil {
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return 0, err
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}
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dataLen, err := l.DecodeHead(t.f)
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if err != nil {
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return 0, err
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}
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return pos + int64(l.HeadSize()) + int64(dataLen), nil
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}
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func (t *tableReader) GetLog(id uint64, l *Log) error {
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if id < t.first || id > t.last {
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return fmt.Errorf("log %d not in [%d=%d]", id, t.first, t.last)
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}
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t.lastReadTime.Set(time.Now().Unix())
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t.Lock()
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defer t.Unlock()
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if err := t.openTable(); err != nil {
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t.close()
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return err
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}
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pos, err := t.getLogPos(int(id - t.first))
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if err != nil {
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return err
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}
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if _, err := t.f.Seek(int64(pos), os.SEEK_SET); err != nil {
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return err
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}
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if err := l.Decode(t.f); err != nil {
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return err
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} else if l.ID != id {
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return fmt.Errorf("invalid log id %d != %d", l.ID, id)
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}
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return nil
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}
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func (t *tableReader) openTable() error {
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var err error
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if t.f == nil {
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if t.f, err = os.Open(t.name); err != nil {
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return err
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}
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}
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if t.m == nil {
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if t.m, err = mmap.MapRegion(t.f, int(t.offsetLen), mmap.RDONLY, 0, t.offsetStartPos); err != nil {
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return err
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}
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}
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return nil
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}
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type tableWriter struct {
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sync.RWMutex
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wf *os.File
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rf *os.File
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rm sync.Mutex
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base string
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name string
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index int64
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first uint64
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last uint64
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offsetBuf []byte
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frozen bool
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maxLogSize int64
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}
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func newTableWriter(base string, index int64, maxLogSize int64) *tableWriter {
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t := new(tableWriter)
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t.base = base
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t.name = path.Join(base, fmtTableName(index))
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t.index = index
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t.maxLogSize = maxLogSize
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return t
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}
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func (t *tableWriter) close() {
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if t.rf != nil {
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t.rf.Close()
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t.rf = nil
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}
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if t.wf != nil {
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t.wf.Close()
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t.wf = nil
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}
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}
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func (t *tableWriter) Close() {
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t.Lock()
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defer t.Unlock()
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t.close()
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}
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func (t *tableWriter) reset() {
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t.close()
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t.first = 0
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t.last = 0
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t.index = t.index + 1
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t.name = path.Join(t.base, fmtTableName(t.index))
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t.offsetBuf = t.offsetBuf[0:0]
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}
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func (t *tableWriter) Flush() (*tableReader, error) {
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t.Lock()
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defer t.Unlock()
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t.frozen = true
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if t.wf == nil {
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return nil, fmt.Errorf("nil write handler")
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}
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defer t.reset()
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tr := new(tableReader)
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tr.name = t.name
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tr.index = t.index
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st, _ := t.wf.Stat()
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tr.first = t.first
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tr.last = t.last
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if n, err := t.wf.Write(log0Data); err != nil {
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return nil, fmt.Errorf("flush log0data error %s", err.Error())
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} else if n != len(log0Data) {
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return nil, fmt.Errorf("flush log0data only %d != %d", n, len(log0Data))
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}
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st, _ = t.wf.Stat()
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if m := st.Size() % pageSize; m != 0 {
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padding := pageSize - m
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if n, err := t.wf.Write(make([]byte, padding)); err != nil {
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return nil, fmt.Errorf("flush log padding error %s", err.Error())
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} else if n != int(padding) {
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return nil, fmt.Errorf("flush log padding error %d != %d", n, padding)
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}
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}
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st, _ = t.wf.Stat()
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if st.Size()%pageSize != 0 {
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return nil, fmt.Errorf("invalid offset start pos, %d", st.Size())
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}
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tr.offsetStartPos = st.Size()
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tr.offsetLen = uint32(len(t.offsetBuf))
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if n, err := t.wf.Write(t.offsetBuf); err != nil {
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log.Error("flush offset buffer error %s", err.Error())
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return nil, err
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} else if n != len(t.offsetBuf) {
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log.Error("flush offset buffer only %d != %d", n, len(t.offsetBuf))
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return nil, io.ErrShortWrite
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}
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if err := binary.Write(t.wf, binary.BigEndian, tr.offsetStartPos); err != nil {
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log.Error("flush offset start pos error %s", err.Error())
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return nil, err
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}
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if err := binary.Write(t.wf, binary.BigEndian, tr.offsetLen); err != nil {
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log.Error("flush offset len error %s", err.Error())
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return nil, err
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}
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if n, err := t.wf.Write(magic); err != nil {
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log.Error("flush magic data error %s", err.Error())
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return nil, err
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} else if n != len(magic) {
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log.Error("flush magic data only %d != %d", n, len(magic))
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return nil, io.ErrShortWrite
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}
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return tr, nil
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}
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func (t *tableWriter) StoreLog(l *Log) error {
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if l.ID == 0 {
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return ErrStoreLogID
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}
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t.Lock()
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defer t.Unlock()
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if t.last > 0 && l.ID != t.last+1 {
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return ErrStoreLogID
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}
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if t.last-t.first+1 > maxLogNumInFile {
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return errTableNeedFlush
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}
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var err error
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if t.wf == nil {
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if t.wf, err = os.OpenFile(t.name, os.O_CREATE|os.O_WRONLY, 0644); err != nil {
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return err
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}
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}
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if t.offsetBuf == nil {
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t.offsetBuf = make([]byte, 0, maxLogNumInFile*4)
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}
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st, _ := t.wf.Stat()
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if st.Size() >= t.maxLogSize {
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return errTableNeedFlush
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}
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offsetPos := uint32(st.Size())
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if err := l.Encode(t.wf); err != nil {
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return err
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}
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t.offsetBuf = append(t.offsetBuf, num.Uint32ToBytes(offsetPos)...)
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if t.first == 0 {
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t.first = l.ID
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}
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t.last = l.ID
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//todo add LRU cache
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return nil
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}
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func (t *tableWriter) GetLog(id uint64, l *Log) error {
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t.RLock()
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defer t.RUnlock()
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if t.frozen {
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return errTableFrozen
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}
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if id < t.first || id > t.last {
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return fmt.Errorf("log %d not in [%d=%d]", id, t.first, t.last)
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}
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//todo memory cache
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offset := binary.BigEndian.Uint32(t.offsetBuf[(id-t.first)*4:])
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if err := t.getLog(l, int64(offset)); err != nil {
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return err
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} else if l.ID != id {
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return fmt.Errorf("invalid log id %d != %d", id, l.ID)
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}
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return nil
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}
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func (t *tableWriter) getLog(l *Log, pos int64) error {
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t.rm.Lock()
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defer t.rm.Unlock()
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var err error
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if t.rf == nil {
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if t.rf, err = os.Open(t.name); err != nil {
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return err
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}
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}
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if _, err = t.rf.Seek(pos, os.SEEK_SET); err != nil {
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return err
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}
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if err = l.Decode(t.rf); err != nil {
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return err
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}
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return nil
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}
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