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507 lines
10 KiB
507 lines
10 KiB
package txlog
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import (
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"bytes"
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"errors"
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"fmt"
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"hash/crc32"
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"os"
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"path/filepath"
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"sync"
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octopus "gordenko.dev/dima/diploma"
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"gordenko.dev/dima/diploma/bin"
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"gordenko.dev/dima/diploma/proto"
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)
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const (
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lsnSize = 4
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packetPrefixSize = 12 // 4 lsn + 4 packet length + 4 crc32
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lengthIdx = 0
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checksumIdx = 4
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lsnIdx = 8
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filePerm = 0770
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dumpSnapshotAfterNBytes = 1024 * 1024 * 1024 // 1 GB
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)
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const (
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CodeAddedMetric byte = 1
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CodeDeletedMetric byte = 2
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CodeAppendedMeasure byte = 4
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CodeAppendedMeasures byte = 5
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CodeAppendedMeasureWithOverflow byte = 6
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CodeDeletedMeasures byte = 7
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)
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func JoinChangesFileName(dir string, logNumber int) string {
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return filepath.Join(dir, fmt.Sprintf("%d.changes", logNumber))
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}
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type Changes struct {
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Records []any
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LogNumber int
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ForceSnapshot bool
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ExitWaitGroup *sync.WaitGroup
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WaitCh chan struct{}
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}
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type Writer struct {
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mutex sync.Mutex
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logNumber int
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dir string
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file *os.File
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buf *bytes.Buffer
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redoFilesToDelete []string
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workerReqs []any
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waitCh chan struct{}
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appendToWorkerQueue func(any)
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lsn uint32
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written int64
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isExited bool
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exitCh chan struct{}
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waitGroup *sync.WaitGroup
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signalCh chan struct{}
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}
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type WriterOptions struct {
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Dir string
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LogNumber int // номер журнала
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AppendToWorkerQueue func(any)
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ExitCh chan struct{}
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WaitGroup *sync.WaitGroup
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}
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func NewWriter(opt WriterOptions) (*Writer, error) {
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if opt.Dir == "" {
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return nil, errors.New("Dir option is required")
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}
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if opt.AppendToWorkerQueue == nil {
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return nil, errors.New("AppendToWorkerQueue option is required")
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}
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if opt.ExitCh == nil {
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return nil, errors.New("ExitCh option is required")
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}
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if opt.WaitGroup == nil {
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return nil, errors.New("WaitGroup option is required")
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}
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s := &Writer{
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dir: opt.Dir,
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buf: bytes.NewBuffer(nil),
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appendToWorkerQueue: opt.AppendToWorkerQueue,
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logNumber: opt.LogNumber,
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exitCh: opt.ExitCh,
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waitGroup: opt.WaitGroup,
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signalCh: make(chan struct{}, 1),
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}
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var err error
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if opt.LogNumber > 0 {
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s.file, err = os.OpenFile(
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JoinChangesFileName(opt.Dir, s.logNumber),
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os.O_APPEND|os.O_WRONLY,
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filePerm,
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)
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if err != nil {
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return nil, err
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}
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} else {
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s.logNumber = 1
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s.file, err = os.OpenFile(
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JoinChangesFileName(opt.Dir, s.logNumber),
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os.O_CREATE|os.O_WRONLY,
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filePerm,
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)
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if err != nil {
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return nil, err
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}
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}
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s.reset()
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return s, nil
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}
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func (s *Writer) Run() {
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for {
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select {
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case <-s.signalCh:
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if err := s.flush(); err != nil {
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octopus.Abort(octopus.FailedWriteToTxLog, err)
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}
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case <-s.exitCh:
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s.exit()
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return
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}
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}
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}
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func (s *Writer) reset() {
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s.buf.Reset()
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s.buf.Write([]byte{
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0, 0, 0, 0, // packet length
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0, 0, 0, 0, // crc32
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0, 0, 0, 0, // lsn
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})
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s.redoFilesToDelete = nil
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s.workerReqs = nil
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s.waitCh = make(chan struct{})
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}
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func (s *Writer) flush() error {
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s.mutex.Lock()
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workerReqs := s.workerReqs
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waitCh := s.waitCh
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isExited := s.isExited
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var exitWaitGroup *sync.WaitGroup
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if s.isExited {
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exitWaitGroup = s.waitGroup
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}
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if s.buf.Len() > packetPrefixSize {
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redoFilesToDelete := s.redoFilesToDelete
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s.lsn++
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lsn := s.lsn
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packet := make([]byte, s.buf.Len())
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copy(packet, s.buf.Bytes())
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s.reset()
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s.written += int64(len(packet)) + 12
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s.mutex.Unlock()
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bin.PutUint32(packet[lengthIdx:], uint32(len(packet)-packetPrefixSize))
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bin.PutUint32(packet[lsnIdx:], lsn)
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bin.PutUint32(packet[checksumIdx:], crc32.ChecksumIEEE(packet[8:]))
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n, err := s.file.Write(packet)
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if err != nil {
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return fmt.Errorf("TxLog write: %s", err)
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}
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if n != len(packet) {
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return fmt.Errorf("TxLog written %d != packet size %d", n, len(packet))
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}
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if err := s.file.Sync(); err != nil {
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return fmt.Errorf("TxLog sync: %s", err)
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}
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for _, fileName := range redoFilesToDelete {
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err = os.Remove(fileName)
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if err != nil {
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octopus.Abort(octopus.RemoveREDOFileFailed, err)
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}
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}
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} else {
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s.waitCh = make(chan struct{})
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s.mutex.Unlock()
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}
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var forceSnapshot bool
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if s.written > dumpSnapshotAfterNBytes {
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forceSnapshot = true
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}
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if isExited && s.written > 0 {
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forceSnapshot = true
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}
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if forceSnapshot {
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if err := s.file.Close(); err != nil {
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return fmt.Errorf("close changes file: %s", err)
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}
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s.logNumber++
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var err error
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s.file, err = os.OpenFile(
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JoinChangesFileName(s.dir, s.logNumber),
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os.O_CREATE|os.O_WRONLY,
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filePerm,
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)
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if err != nil {
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return fmt.Errorf("create new changes file: %s", err)
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}
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s.written = 0
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}
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s.appendToWorkerQueue(Changes{
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Records: workerReqs,
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ForceSnapshot: forceSnapshot,
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LogNumber: s.logNumber,
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WaitCh: waitCh,
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ExitWaitGroup: exitWaitGroup,
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})
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return nil
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}
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func (s *Writer) exit() {
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s.mutex.Lock()
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s.isExited = true
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s.mutex.Unlock()
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if err := s.flush(); err != nil {
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octopus.Abort(octopus.FailedWriteToTxLog, err)
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}
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}
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// API
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type AddedMetric struct {
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MetricID uint32
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MetricType octopus.MetricType
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FracDigits int
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}
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func (s *Writer) WriteAddedMetric(req AddedMetric) chan struct{} {
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arr := []byte{
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CodeAddedMetric,
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0, 0, 0, 0, //
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byte(req.MetricType),
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byte(req.FracDigits),
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}
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bin.PutUint32(arr[1:], req.MetricID)
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// пишу в буфер
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s.mutex.Lock()
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s.buf.Write(arr)
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s.workerReqs = append(s.workerReqs, req)
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s.mutex.Unlock()
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s.sendSignal()
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return s.waitCh
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}
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type DeletedMetric struct {
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MetricID uint32
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FreeDataPages []uint32
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FreeIndexPages []uint32
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}
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func (s *Writer) WriteDeletedMetric(req DeletedMetric) chan struct{} {
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arr := []byte{
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CodeDeletedMetric,
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0, 0, 0, 0, // metricID
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}
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bin.PutUint32(arr[1:], req.MetricID)
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// пишу в буфер
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s.mutex.Lock()
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defer s.mutex.Unlock()
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s.buf.Write(arr)
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s.packFreeDataAndIndexPages(req.FreeDataPages, req.FreeIndexPages)
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s.workerReqs = append(s.workerReqs, req)
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s.sendSignal()
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return s.waitCh
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}
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type AppendedMeasure struct {
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MetricID uint32
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Timestamp uint32
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Value float64
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}
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func (s *Writer) WriteAppendMeasure(req AppendedMeasure) chan struct{} {
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arr := []byte{
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CodeAppendedMeasure,
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0, 0, 0, 0, // metricID
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0, 0, 0, 0, // timestamp
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0, 0, 0, 0, 0, 0, 0, 0, // value
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}
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bin.PutUint32(arr[1:], req.MetricID)
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bin.PutUint32(arr[5:], req.Timestamp)
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bin.PutFloat64(arr[9:], req.Value)
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//
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s.mutex.Lock()
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s.buf.Write(arr)
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s.workerReqs = append(s.workerReqs, req)
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s.mutex.Unlock()
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s.sendSignal()
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return s.waitCh
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}
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type AppendedMeasures struct {
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MetricID uint32
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Measures []proto.Measure
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}
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type AppendedMeasuresExtended struct {
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Record AppendedMeasures
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HoldLock bool
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}
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func (s *Writer) WriteAppendMeasures(req AppendedMeasures, holdLock bool) chan struct{} {
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arr := []byte{
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CodeAppendedMeasures,
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0, 0, 0, 0, // metricID
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0, 0, // qty
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}
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bin.PutUint32(arr[1:], req.MetricID)
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bin.PutUint16(arr[5:], uint16(len(req.Measures)))
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//
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s.mutex.Lock()
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s.buf.Write(arr)
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for _, measure := range req.Measures {
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bin.WriteUint32(s.buf, measure.Timestamp)
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bin.WriteFloat64(s.buf, measure.Value)
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}
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s.workerReqs = append(s.workerReqs, AppendedMeasuresExtended{
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Record: req,
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HoldLock: holdLock,
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})
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s.mutex.Unlock()
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s.sendSignal()
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return s.waitCh
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}
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type AppendedMeasureWithOverflow struct {
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MetricID uint32
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Timestamp uint32
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Value float64
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IsDataPageReused bool
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DataPageNo uint32
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IsRootChanged bool
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RootPageNo uint32
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ReusedIndexPages []uint32
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}
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type AppendedMeasureWithOverflowExtended struct {
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Record AppendedMeasureWithOverflow
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HoldLock bool
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}
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/*
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Формат:
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1b code
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4b metricID
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4b timestamp
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8b value
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1b isReusedDataPage
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4b dataPageNo
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1b isRootChanged
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[4b] newRootPageNo
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1b reusedIndexPages length
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[N * 4b] reusedIndexPages
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*/
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func (s *Writer) WriteAppendedMeasureWithOverflow(req AppendedMeasureWithOverflow, redoFileName string, holdLock bool) chan struct{} {
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size := 24 + len(req.ReusedIndexPages)*4
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if req.IsRootChanged {
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size += 4
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}
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tmp := make([]byte, size)
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tmp[0] = CodeAppendedMeasureWithOverflow
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bin.PutUint32(tmp[1:], req.MetricID)
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bin.PutUint32(tmp[5:], req.Timestamp)
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bin.PutFloat64(tmp[9:], req.Value)
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if req.IsDataPageReused {
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tmp[17] = 1
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}
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bin.PutUint32(tmp[18:], req.DataPageNo)
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pos := 22
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if req.IsRootChanged {
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tmp[pos] = 1
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bin.PutUint32(tmp[pos+1:], req.RootPageNo)
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pos += 5
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} else {
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tmp[pos] = 0
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pos += 1
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}
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tmp[pos] = byte(len(req.ReusedIndexPages))
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pos += 1
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for _, indexPageNo := range req.ReusedIndexPages {
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bin.PutUint32(tmp[pos:], indexPageNo)
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pos += 4
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}
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s.mutex.Lock()
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s.buf.Write(tmp)
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s.workerReqs = append(s.workerReqs, AppendedMeasureWithOverflowExtended{
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Record: req,
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HoldLock: holdLock,
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})
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s.redoFilesToDelete = append(s.redoFilesToDelete, redoFileName)
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s.mutex.Unlock()
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s.sendSignal()
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return s.waitCh
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}
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type DeletedMeasures struct {
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MetricID uint32
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FreeDataPages []uint32
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FreeIndexPages []uint32
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}
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/*
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Формат:
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1b code
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4b metricID
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1b freeDataPages length
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[N * 4b] freeDataPages
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1b freeIndexPages length
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[N * 4b] freeIndexPages
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*/
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func (s *Writer) WriteDeletedMeasures(op DeletedMeasures) chan struct{} {
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tmp := []byte{
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CodeDeletedMeasures,
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0, 0, 0, 0,
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}
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bin.PutUint32(tmp[1:], op.MetricID)
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// записываю часть фиксированного размера
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s.mutex.Lock()
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s.buf.Write(tmp)
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s.packFreeDataAndIndexPages(op.FreeDataPages, op.FreeIndexPages)
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s.workerReqs = append(s.workerReqs, op)
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s.mutex.Unlock()
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s.sendSignal()
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return s.waitCh
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}
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type DeletedMeasuresSince struct {
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MetricID uint32
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LastPageNo uint32
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IsRootChanged bool
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RootPageNo uint32
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FreeDataPages []uint32
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FreeIndexPages []uint32
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TimestampsBuf []byte
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ValuesBuf []byte
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}
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func (s *Writer) sendSignal() {
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select {
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case s.signalCh <- struct{}{}:
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default:
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}
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}
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// helper
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func (s *Writer) packFreeDataAndIndexPages(freeDataPages, freeIndexPages []uint32) {
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// записываю data pages
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bin.WriteVarUint64(s.buf, uint64(len(freeDataPages)))
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for _, dataPageNo := range freeDataPages {
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bin.WriteUint32(s.buf, dataPageNo)
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}
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// записываю index pages
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bin.WriteVarUint64(s.buf, uint64(len(freeIndexPages)))
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for _, indexPageNo := range freeIndexPages {
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bin.WriteUint32(s.buf, indexPageNo)
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}
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}
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