mirror of https://github.com/ledisdb/ledisdb.git
571 lines
10 KiB
Go
571 lines
10 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/siddontang/go/log"
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"github.com/siddontang/go/sync2"
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"io"
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"path"
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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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errTableNeedFlush = errors.New("write table need flush")
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errNilHandler = errors.New("nil write handler")
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)
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const tableReaderKeepaliveInterval int64 = 30
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func fmtTableDataName(base string, index int64) string {
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return path.Join(base, fmt.Sprintf("%08d.data", index))
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}
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func fmtTableMetaName(base string, index int64) string {
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return path.Join(base, fmt.Sprintf("%08d.meta", index))
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}
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type tableReader struct {
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sync.Mutex
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base string
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index int64
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data readFile
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meta readFile
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first uint64
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last uint64
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lastTime uint32
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lastReadTime sync2.AtomicInt64
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useMmap bool
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}
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func newTableReader(base string, index int64, useMmap bool) (*tableReader, error) {
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if index <= 0 {
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return nil, fmt.Errorf("invalid index %d", index)
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}
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t := new(tableReader)
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t.base = base
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t.index = index
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t.useMmap = useMmap
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var err error
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if err = t.check(); err != nil {
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log.Error("check %d error: %s, try to repair", t.index, err.Error())
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if err = t.repair(); err != nil {
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log.Error("repair %d error: %s", t.index, 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) String() string {
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return fmt.Sprintf("%d", t.index)
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}
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func (t *tableReader) Close() {
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t.Lock()
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t.close()
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t.Unlock()
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}
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func (t *tableReader) close() {
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if t.data != nil {
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t.data.Close()
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t.data = nil
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}
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if t.meta != nil {
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t.meta.Close()
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t.meta = 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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var buf [4]byte
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if _, err := t.meta.ReadAt(buf[0:4], int64(index)*4); err != nil {
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return 0, err
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}
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return binary.BigEndian.Uint32(buf[0:4]), nil
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}
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func (t *tableReader) checkData() error {
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var err error
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//check will use raw file mode
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if t.data, err = newReadFile(false, fmtTableDataName(t.base, t.index)); err != nil {
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return err
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}
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if t.data.Size() < len(magic) {
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return fmt.Errorf("data file %s size %d too short", t.data.Name(), t.data.Size())
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}
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buf := make([]byte, len(magic))
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if _, err := t.data.ReadAt(buf, int64(t.data.Size()-len(magic))); err != nil {
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return err
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}
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if !bytes.Equal(magic, buf) {
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return fmt.Errorf("data file %s invalid magic data %q", t.data.Name(), buf)
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}
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return nil
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}
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func (t *tableReader) checkMeta() error {
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var err error
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//check will use raw file mode
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if t.meta, err = newReadFile(false, fmtTableMetaName(t.base, t.index)); err != nil {
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return err
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}
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if t.meta.Size()%4 != 0 || t.meta.Size() == 0 {
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return fmt.Errorf("meta file %s invalid offset len %d, must 4 multiple and not 0", t.meta.Name(), t.meta.Size())
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}
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return 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 err := t.checkMeta(); err != nil {
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return err
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}
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if err := t.checkData(); 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(t.meta.Size()/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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}
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var l Log
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if _, err = t.decodeLogHead(&l, t.data, 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, t.data, int64(lastLogPos)); err != nil {
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return fmt.Errorf("decode last log err %s", err.Error())
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} else if n+int64(len(magic)) != int64(t.data.Size()) {
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return fmt.Errorf("extra log data at offset %d", n)
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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.meta.Size()/4) {
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return fmt.Errorf("invalid log table, first %d, last %d, and log num %d", t.first, t.last, t.meta.Size()/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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var data writeFile
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var meta writeFile
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//repair will use raw file mode
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data, err = newWriteFile(false, fmtTableDataName(t.base, t.index), 0)
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data.SetOffset(int64(data.Size()))
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meta, err = newWriteFile(false, fmtTableMetaName(t.base, t.index), int64(defaultLogNumInFile*4))
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var l Log
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var pos int64 = 0
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var nextPos int64 = 0
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b := make([]byte, 4)
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t.first = 0
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t.last = 0
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for {
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nextPos, err = t.decodeLogHead(&l, data, pos)
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if err != nil {
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//if error, we may lost all logs from pos
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log.Error("%s may lost logs from %d", data.Name(), pos)
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break
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}
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if l.ID == 0 {
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log.Error("%s may lost logs from %d, invalid log 0", data.Name(), pos)
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break
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}
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if t.first == 0 {
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t.first = l.ID
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}
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if t.last == 0 {
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t.last = l.ID
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} else if l.ID <= t.last {
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log.Error("%s may lost logs from %d, invalid logid %d", t.data.Name(), pos, l.ID)
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break
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}
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t.last = l.ID
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t.lastTime = l.CreateTime
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binary.BigEndian.PutUint32(b, uint32(pos))
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meta.Write(b)
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pos = nextPos
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t.lastTime = l.CreateTime
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}
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var e error
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if err := meta.Close(); err != nil {
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e = err
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}
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data.SetOffset(pos)
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if _, err = data.Write(magic); err != nil {
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log.Error("write magic error %s", err.Error())
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}
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if err = data.Close(); err != nil {
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return err
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}
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return e
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}
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func (t *tableReader) decodeLogHead(l *Log, r io.ReaderAt, pos int64) (int64, error) {
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dataLen, err := l.DecodeHeadAt(r, pos)
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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 ErrLogNotFound
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}
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t.lastReadTime.Set(time.Now().Unix())
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t.Lock()
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if err := t.openTable(); err != nil {
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t.close()
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t.Unlock()
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return err
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}
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t.Unlock()
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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 := l.DecodeAt(t.data, int64(pos)); 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.data == nil {
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if t.data, err = newReadFile(t.useMmap, fmtTableDataName(t.base, t.index)); err != nil {
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return err
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}
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}
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if t.meta == nil {
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if t.meta, err = newReadFile(t.useMmap, fmtTableMetaName(t.base, t.index)); 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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data writeFile
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meta writeFile
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base string
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index int64
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first uint64
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last uint64
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lastTime uint32
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maxLogSize int64
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closed bool
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syncType int
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posBuf []byte
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useMmap bool
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}
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func newTableWriter(base string, index int64, maxLogSize int64, useMmap bool) *tableWriter {
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if index <= 0 {
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panic(fmt.Errorf("invalid index %d", index))
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}
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t := new(tableWriter)
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t.base = base
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t.index = index
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t.maxLogSize = maxLogSize
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t.closed = false
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t.posBuf = make([]byte, 4)
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t.useMmap = useMmap
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return t
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}
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func (t *tableWriter) String() string {
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return fmt.Sprintf("%d", t.index)
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}
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func (t *tableWriter) SetMaxLogSize(s int64) {
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t.maxLogSize = s
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}
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func (t *tableWriter) SetSyncType(tp int) {
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t.syncType = tp
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}
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func (t *tableWriter) close() {
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if t.meta != nil {
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if err := t.meta.Close(); err != nil {
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log.Fatal("close log meta error %s", err.Error())
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}
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t.meta = nil
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}
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if t.data != nil {
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if _, err := t.data.Write(magic); err != nil {
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log.Fatal("write magic error %s", err.Error())
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}
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if err := t.data.Close(); err != nil {
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log.Fatal("close log data error %s", err.Error())
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}
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t.data = 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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t.closed = true
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t.close()
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t.Unlock()
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}
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func (t *tableWriter) First() uint64 {
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t.Lock()
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id := t.first
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t.Unlock()
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return id
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}
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func (t *tableWriter) Last() uint64 {
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t.Lock()
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id := t.last
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t.Unlock()
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return id
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}
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func (t *tableWriter) Flush() (*tableReader, error) {
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t.Lock()
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if t.data == nil || t.meta == nil {
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t.Unlock()
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return nil, errNilHandler
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}
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tr := new(tableReader)
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tr.base = t.base
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tr.index = t.index
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tr.first = t.first
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tr.last = t.last
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tr.lastTime = t.lastTime
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tr.useMmap = t.useMmap
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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.Unlock()
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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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t.Lock()
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err := t.storeLog(l)
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t.Unlock()
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return err
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}
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func (t *tableWriter) openFile() error {
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var err error
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if t.data == nil {
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if t.data, err = newWriteFile(t.useMmap, fmtTableDataName(t.base, t.index), t.maxLogSize+t.maxLogSize/10+int64(len(magic))); err != nil {
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return err
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}
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}
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if t.meta == nil {
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if t.meta, err = newWriteFile(t.useMmap, fmtTableMetaName(t.base, t.index), int64(defaultLogNumInFile*4)); err != nil {
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return err
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}
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}
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return err
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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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if t.closed {
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return fmt.Errorf("table writer is closed")
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}
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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.data != nil && t.data.Offset() > t.maxLogSize {
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return errTableNeedFlush
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}
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var err error
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if err = t.openFile(); err != nil {
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return err
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}
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offsetPos := t.data.Offset()
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if err = l.Encode(t.data); err != nil {
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return err
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}
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binary.BigEndian.PutUint32(t.posBuf, uint32(offsetPos))
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if _, err = t.meta.Write(t.posBuf); err != nil {
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return err
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}
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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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t.lastTime = l.CreateTime
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if t.syncType == 2 {
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if err := t.data.Sync(); err != nil {
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log.Error("sync table error %s", err.Error())
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}
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}
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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 id < t.first || id > t.last {
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return ErrLogNotFound
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}
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var buf [4]byte
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if _, err := t.meta.ReadAt(buf[0:4], int64((id-t.first)*4)); err != nil {
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return err
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}
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offset := binary.BigEndian.Uint32(buf[0:4])
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if err := l.DecodeAt(t.data, 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) Sync() error {
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t.Lock()
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var err error
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if t.data != nil {
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err = t.data.Sync()
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t.Unlock()
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return err
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}
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if t.meta != nil {
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err = t.meta.Sync()
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}
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t.Unlock()
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return err
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}
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