764 lines
18 KiB
Go
764 lines
18 KiB
Go
package txlog
|
||
|
||
import (
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"bufio"
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"bytes"
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"errors"
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"fmt"
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"io"
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"log"
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||
"math"
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||
"os"
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||
"path/filepath"
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"sync"
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||
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bin "gordenko.dev/dima/bin/little"
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"gordenko.dev/dima/qb"
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"gordenko.dev/dima/qb/atree"
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"gordenko.dev/dima/qb/freelist"
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"gordenko.dev/dima/qb/util"
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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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writeBufferSize = 4 * 1024 * 1024
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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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CodeAppendedPages byte = 6
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CodeDeletedMeasures byte = 7
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)
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type FreeList interface {
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// використовується в allocPage
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GetPageNumber() (uint32, error)
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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 MetricsState struct {
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Metrics []Metric
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WaitCh chan struct{}
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}
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type Changes struct {
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Records []any
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MetricsCh chan MetricsState
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}
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type Writer struct {
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mutex sync.Mutex
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dataPagesCount uint32
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indexPagesCount uint32
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dataFreeList *freelist.FreeList
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indexFreeList *freelist.FreeList
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atree *atree.Atree
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logNumber int
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dir string
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||
w *bytes.Buffer // wal буфер для упаковки даних перед записом на диск
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wal *os.File
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dataFile *os.File
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indexFile *os.File
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// буфер для складання payload на сторінку, розрахунку CRC32 та інше
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pageBuffer []byte
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||
input []any
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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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||
DataFreeList *freelist.FreeList
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IndexFreeList *freelist.FreeList
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Atree *atree.Atree
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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.DataFreeList == nil {
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||
return nil, errors.New("DataFreeList option is required")
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||
}
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||
if opt.IndexFreeList == nil {
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||
return nil, errors.New("IndexFreeList option is required")
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||
}
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||
if opt.Atree == nil {
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||
return nil, errors.New("Atree 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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||
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||
s := &Writer{
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||
dir: opt.Dir,
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||
appendToWorkerQueue: opt.AppendToWorkerQueue,
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||
dataFreeList: opt.DataFreeList,
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||
indexFreeList: opt.IndexFreeList,
|
||
atree: opt.Atree,
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||
logNumber: opt.LogNumber,
|
||
exitCh: opt.ExitCh,
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||
waitGroup: opt.WaitGroup,
|
||
signalCh: make(chan struct{}, 1),
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||
}
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||
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var err error
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||
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||
if opt.LogNumber > 0 {
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||
s.wal, err = os.OpenFile(
|
||
JoinChangesFileName(opt.Dir, s.logNumber),
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||
os.O_APPEND|os.O_WRONLY,
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||
filePerm,
|
||
)
|
||
if err != nil {
|
||
return nil, err
|
||
}
|
||
} else {
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||
s.logNumber = 1
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s.wal, 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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||
)
|
||
if err != nil {
|
||
return nil, err
|
||
}
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||
}
|
||
return s, nil
|
||
}
|
||
|
||
func (s *Writer) Run() {
|
||
for {
|
||
select {
|
||
case <-s.signalCh:
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||
if err := s.packAndWrite(); err != nil {
|
||
qb.Abort(qb.FailedWriteToTxLog, err)
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||
}
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||
|
||
case <-s.exitCh:
|
||
s.exit()
|
||
return
|
||
}
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||
}
|
||
}
|
||
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||
func (s *Writer) getDataPageNumber() (uint32, bool, error) {
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pageNo, err := s.dataFreeList.GetPageNumber()
|
||
if err != nil {
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||
return 0, false, err
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||
}
|
||
if pageNo > 0 {
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||
return pageNo, true, nil
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||
}
|
||
if s.dataPagesCount < math.MaxUint32 {
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||
s.dataPagesCount++
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||
return s.dataPagesCount, false, nil
|
||
}
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||
return 0, false, errors.New("no space")
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||
}
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||
|
||
func (s *Writer) getIndexPageNumber() (uint32, bool, error) {
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||
pageNo, err := s.indexFreeList.GetPageNumber()
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||
if err != nil {
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||
return 0, false, err
|
||
}
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||
if pageNo > 0 {
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||
return pageNo, true, nil
|
||
}
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||
if s.indexPagesCount < math.MaxUint32 {
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||
s.indexPagesCount++
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||
return s.indexPagesCount, false, nil
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}
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||
return 0, false, errors.New("no space")
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||
}
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func (s *Writer) packAndWrite() (err error) {
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||
s.mutex.Lock()
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//isExited := s.isExited
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||
input := s.input
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||
s.input = nil
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||
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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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||
s.mutex.Unlock()
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||
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prepared := prepareData(input)
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// 3. Пишу на диск WAL (append)
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||
n, err := s.wal.Write(prepared.Packet)
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||
if err != nil {
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||
return
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||
}
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||
if n != len(prepared.Packet) {
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return fmt.Errorf("written %d != total size %d", n, len(prepared.Packet))
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||
}
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if err = s.wal.Sync(); err != nil {
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||
return
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}
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// 4. Пишу в atree сторінки
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||
err = s.writePagesToAtree(prepared.WriteToIndex, prepared.WriteToData)
|
||
if err != nil {
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||
return
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||
}
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||
|
||
// 6. відправляю input - worker-у
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||
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var (
|
||
forceSnapshot bool
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||
)
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||
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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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||
metricsStateCh := make(chan MetricsState)
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||
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||
s.appendToWorkerQueue(Changes{
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||
Records: prepared.ToWorker,
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||
MetricsCh: metricsStateCh,
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||
})
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||
if err := s.wal.Close(); err != nil {
|
||
return fmt.Errorf("close changes file: %s", err)
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||
}
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state := <-metricsStateCh
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||
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s.logNumber++
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|
||
// write snapshot FIX
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||
err = writeSnapshot(Snapshot{
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||
LogNumber: s.logNumber,
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||
Dir: s.dir,
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||
WriteBufferSize: writeBufferSize,
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||
Metrics: state.Metrics,
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||
DataFreeList: s.dataFreeList,
|
||
IndexFreeList: s.indexFreeList,
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||
})
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||
if err != nil {
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||
return fmt.Errorf("write snapshot file: %s", err)
|
||
}
|
||
|
||
var err error
|
||
s.wal, err = os.OpenFile(
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||
JoinChangesFileName(s.dir, s.logNumber),
|
||
os.O_CREATE|os.O_WRONLY,
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||
filePerm,
|
||
)
|
||
if err != nil {
|
||
return fmt.Errorf("create new changes file: %s", err)
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||
}
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||
|
||
s.written = 0
|
||
// release Worker
|
||
close(state.WaitCh)
|
||
} else {
|
||
s.appendToWorkerQueue(Changes{
|
||
Records: prepared.ToWorker,
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||
})
|
||
}
|
||
|
||
// Якщо потрібен снапшот - відправляю канал із буфером розміру 1,
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||
// в який воркер має покласти снапшот отриманий після застосування змін (records).
|
||
// Після чого Writer створює нові файли snapshot і changes і працює далі.
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||
|
||
// flush
|
||
// err = s.flush(w)
|
||
// if err != nil {
|
||
// return err
|
||
// }
|
||
|
||
// FIX send to worker workerReqs
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||
return nil
|
||
}
|
||
|
||
func (s *Writer) Append(req any) {
|
||
s.mutex.Lock()
|
||
s.input = append(s.input, req)
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||
s.mutex.Unlock()
|
||
|
||
select {
|
||
case s.signalCh <- struct{}{}:
|
||
default:
|
||
}
|
||
}
|
||
|
||
// func (s *Writer) reset() {
|
||
// s.buf.Reset()
|
||
// s.buf.Write([]byte{
|
||
// 0, 0, 0, 0, // packet length
|
||
// 0, 0, 0, 0, // crc32
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||
// 0, 0, 0, 0, // lsn
|
||
|
||
// })
|
||
// s.pagesToWrite = nil
|
||
// s.workerReqs = nil
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||
// s.waitCh = make(chan struct{})
|
||
// }
|
||
|
||
// func (s *Writer) flush(w *bytes.Buffer) error {
|
||
|
||
// return nil
|
||
// }
|
||
|
||
func (s *Writer) exit() {
|
||
s.mutex.Lock()
|
||
s.isExited = true
|
||
s.mutex.Unlock()
|
||
|
||
if err := s.packAndWrite(); err != nil {
|
||
qb.Abort(qb.FailedWriteToTxLog, err)
|
||
}
|
||
}
|
||
|
||
type IndexPayloadToWrite struct {
|
||
PageNo uint32
|
||
Payload []byte
|
||
ZeroLevel bool
|
||
}
|
||
|
||
type DataPayloadToWrite struct {
|
||
PrevPageNo uint32
|
||
Timestamps [][]byte // chunks
|
||
TimestampsSize int
|
||
Values [][]byte // chunks
|
||
ValuesSize int
|
||
PageNo uint32
|
||
}
|
||
|
||
// writePagesToAtree - записує сторінки в .data та .index файли
|
||
func (s *Writer) writePagesToAtree(indexItems []IndexPayloadToWrite, dataItems []DataPayloadToWrite) (err error) {
|
||
for _, p := range dataItems {
|
||
atree.ChunksToDataPage(s.pageBuffer, atree.ChunksToDataPageReq{
|
||
PrevPageNo: p.PrevPageNo,
|
||
Timestamps: p.Timestamps,
|
||
TimestampsSize: p.TimestampsSize,
|
||
Values: p.Values,
|
||
ValuesSize: p.ValuesSize,
|
||
})
|
||
var (
|
||
off = (p.PageNo - 1) * atree.DataPageSize
|
||
n int
|
||
)
|
||
n, err = s.dataFile.WriteAt(s.pageBuffer, int64(off))
|
||
if err != nil {
|
||
return
|
||
}
|
||
if n != atree.DataPageSize {
|
||
return fmt.Errorf("write %d instead of %d", n, atree.DataPageSize)
|
||
}
|
||
}
|
||
for _, p := range indexItems {
|
||
// if len(p.Payload) > atree.MaxIndexPayload {
|
||
// return fmt.Errorf("wrong index payload size: %d", len(p.Payload))
|
||
// }
|
||
indexPageBuffer := s.pageBuffer[:atree.IndexPageSize]
|
||
atree.DataToIndexPage(indexPageBuffer, p.Payload, p.ZeroLevel)
|
||
var (
|
||
off = (p.PageNo - 1) * atree.IndexPageSize
|
||
n int
|
||
)
|
||
n, err = s.indexFile.WriteAt(indexPageBuffer, int64(off))
|
||
if err != nil {
|
||
return
|
||
}
|
||
if n != atree.IndexPageSize {
|
||
return fmt.Errorf("write %d instead of %d", n, atree.IndexPageSize)
|
||
}
|
||
}
|
||
return nil
|
||
}
|
||
|
||
type AppendMeasuresSummary struct {
|
||
MetricID uint32
|
||
//TimestampsOffset int // (заповнені одразу)
|
||
//ValuesOffset int // (заповнені одразу)
|
||
// Timestamps [][]byte
|
||
// TimestampsSize int
|
||
// Values [][]byte
|
||
// ValuesSize int
|
||
LastPageNo uint32
|
||
Index [][]byte
|
||
ResultCode int
|
||
WrittenCount int
|
||
ResultCh chan struct{}
|
||
}
|
||
|
||
type AppendedMeasures struct {
|
||
MetricID uint32
|
||
TimestampsOffset int // (заповнені одразу)
|
||
ValuesOffset int // (заповнені одразу)
|
||
Timestamps [][]byte
|
||
TimestampsSize int
|
||
Values [][]byte
|
||
ValuesSize int
|
||
IndexLevels []*atree.IndexLevel
|
||
DataPages []*atree.DataPage // fix - prevPageNo for the 1st data page
|
||
ResultCode int
|
||
WrittenCount int
|
||
ResultCh chan struct{}
|
||
}
|
||
|
||
func (s *Writer) packMeasuresIntoWALBuffer(req AppendedMeasures) (err error) {
|
||
// fix write code
|
||
bin.WriteUint32(s.w, req.MetricID)
|
||
bin.WriteVarSize(s.w, len(req.DataPages))
|
||
for idx, p := range req.DataPages {
|
||
bin.WriteUint32(s.w, p.PageNo)
|
||
var reused byte
|
||
if p.IsReused {
|
||
reused = 1
|
||
}
|
||
s.w.WriteByte(reused)
|
||
bin.WriteUint32(s.w, p.PrevPageNo)
|
||
//bin.WriteUint32(s.w, p.Checksum)
|
||
var (
|
||
timestampsOffset int
|
||
valuesOffset int
|
||
)
|
||
if idx == 0 {
|
||
timestampsOffset = req.TimestampsOffset
|
||
valuesOffset = req.ValuesOffset
|
||
}
|
||
copyPayloadFromChunks(s.w, p.Timestamps, p.TimestampsSize, timestampsOffset)
|
||
copyPayloadFromChunks(s.w, p.Values, p.ValuesSize, valuesOffset)
|
||
}
|
||
bin.WriteUint16(s.w, uint16(req.TimestampsOffset))
|
||
bin.WriteUint16(s.w, uint16(req.ValuesOffset))
|
||
var (
|
||
timestampsOffset int
|
||
valuesOffset int
|
||
)
|
||
if len(req.DataPages) == 0 {
|
||
timestampsOffset = req.TimestampsOffset
|
||
valuesOffset = req.ValuesOffset
|
||
}
|
||
copyPayloadFromChunks(s.w, req.Timestamps, req.TimestampsSize, timestampsOffset)
|
||
copyPayloadFromChunks(s.w, req.Values, req.ValuesSize, valuesOffset)
|
||
if len(req.DataPages) == 0 {
|
||
return
|
||
}
|
||
// fix - levels reduced
|
||
bin.WriteVarSize(s.w, len(req.IndexLevels))
|
||
for _, level := range req.IndexLevels {
|
||
bin.WriteVarSize(s.w, len(level.Filled))
|
||
for idx, p := range level.Filled {
|
||
bin.WriteUint32(s.w, p.PageNo)
|
||
var reused byte
|
||
if p.IsReused {
|
||
reused = 1
|
||
}
|
||
s.w.WriteByte(reused)
|
||
//bin.WriteUint32(s.w, p.Checksum)
|
||
records := p.Data
|
||
if idx == 0 {
|
||
records = p.Data[level.Offset:]
|
||
}
|
||
if (len(records) % recordSize) != 0 {
|
||
log.Fatalf("wrong records length: %d", len(records))
|
||
}
|
||
bin.WriteVarSize(s.w, len(records)/recordSize)
|
||
s.w.Write(records)
|
||
}
|
||
records := level.Data
|
||
if len(level.Filled) == 0 {
|
||
records = level.Data[level.Offset:]
|
||
}
|
||
if (len(records) % recordSize) != 0 {
|
||
log.Fatalf("wrong unfilled records length: %d", len(records))
|
||
}
|
||
bin.WriteVarSize(s.w, len(records)/recordSize)
|
||
s.w.Write(records)
|
||
}
|
||
return
|
||
}
|
||
|
||
// API
|
||
|
||
// FIX - add
|
||
// type DeletedMeasuresSince struct {
|
||
// MetricID uint32
|
||
// LastPageNo uint32
|
||
// IsRootChanged bool
|
||
// RootPageNo uint32
|
||
// FreeDataPages []uint32
|
||
// FreeIndexPages []uint32
|
||
// TimestampsBuf []byte
|
||
// ValuesBuf []byte
|
||
// }
|
||
|
||
func (s *Writer) sendSignal() {
|
||
select {
|
||
case s.signalCh <- struct{}{}:
|
||
default:
|
||
}
|
||
}
|
||
|
||
// Якщо (Pages) > 0 - незаповнену сторінку кодую в стисненому вигляді.
|
||
// Якщо (Pages) = 0 - кодую просто пари timestamp / value
|
||
// func (s *Writer) packWriteAppended(w *bytes.Buffer, req AppendedPagesReq) {
|
||
// // завантажений path. Отже просто додаємо в дерево data сторінки, створюємо нові індексні
|
||
// // без звернення до диску.
|
||
// report := s.atree.AppendDataPages(atree.AppendDataPagesReq{
|
||
// LastPageNo: req.LastPageNo,
|
||
// Legs: req.Legs,
|
||
// DataPages: req.Pages,
|
||
// })
|
||
|
||
// m := AppendedPages{
|
||
// MetricID: req.MetricID,
|
||
// Timestamp: req.Timestamp,
|
||
// Value: req.Value,
|
||
// NewRootPageNo: report.NewRootPageNo,
|
||
// LastPageNo: report.LastPageNo,
|
||
// Pages: report.Pages,
|
||
// TimestampsChunks: req.TimestampsChunks,
|
||
// TimestampsSize: int(req.TimestampsSize),
|
||
// ValuesChunks: req.ValuesChunks,
|
||
// ValuesSize: int(req.ValuesSize),
|
||
// }
|
||
// m.Pack(w)
|
||
// }
|
||
|
||
// helpers
|
||
|
||
/*
|
||
Формат:
|
||
metricsQty - varuint
|
||
[metric]*
|
||
де metric - це:
|
||
metricID - 4b
|
||
metricType - 1b
|
||
fracDigits - 1b
|
||
lastPageNo - 4b
|
||
since - 4b
|
||
sinceValue - 8b
|
||
until - 4b
|
||
untilValue - 8b
|
||
timestamps size - 2b
|
||
values size - 2b
|
||
timestams payload - Nb
|
||
values payload - Nb
|
||
data free list frozen pages - varsize
|
||
dataFreeList size - varsize
|
||
dataFreeList - Nb
|
||
index free list frozen pages - varsize
|
||
indexFreeList size - varsize
|
||
indexFreeList - Nb
|
||
CRC32 - 4b
|
||
*/
|
||
|
||
const metricHeaderSize = 38
|
||
|
||
type Metric struct {
|
||
MetricID uint32
|
||
MetricType qb.MetricType
|
||
FracDigits byte
|
||
LastPageNo uint32
|
||
Since uint32
|
||
SinceValue float64
|
||
Until uint32
|
||
UntilValue float64
|
||
Timestamps [][]byte
|
||
TimestampsSize int
|
||
Values [][]byte
|
||
ValuesSize int
|
||
}
|
||
|
||
type Snapshot struct {
|
||
LogNumber int
|
||
Dir string
|
||
WriteBufferSize int
|
||
Metrics []Metric
|
||
IndexFreeList *freelist.FreeList
|
||
DataFreeList *freelist.FreeList
|
||
}
|
||
|
||
func writeSnapshot(snapshot Snapshot) (err error) {
|
||
var (
|
||
fileName = filepath.Join(snapshot.Dir, fmt.Sprintf("%d.snapshot", snapshot.LogNumber))
|
||
hasher = util.NewHasher()
|
||
prefix = make([]byte, metricHeaderSize)
|
||
)
|
||
|
||
file, err := os.OpenFile(fileName, os.O_CREATE|os.O_WRONLY, 0770)
|
||
if err != nil {
|
||
return
|
||
}
|
||
|
||
dst := io.MultiWriter(bufio.NewWriterSize(file, snapshot.WriteBufferSize), hasher)
|
||
|
||
_, err = bin.WriteVarSize(dst, len(snapshot.Metrics))
|
||
if err != nil {
|
||
return
|
||
}
|
||
|
||
for _, metric := range snapshot.Metrics {
|
||
tSize := metric.TimestampsSize
|
||
vSize := metric.ValuesSize
|
||
|
||
bin.PutUint32(prefix[0:], metric.MetricID)
|
||
prefix[4] = byte(metric.MetricType)
|
||
prefix[5] = metric.FracDigits
|
||
bin.PutUint32(prefix[6:], metric.LastPageNo)
|
||
bin.PutUint32(prefix[10:], metric.Since)
|
||
bin.PutFloat64(prefix[14:], metric.SinceValue)
|
||
bin.PutUint32(prefix[22:], metric.Until)
|
||
bin.PutFloat64(prefix[26:], metric.UntilValue)
|
||
bin.PutUint16(prefix[34:], uint16(tSize))
|
||
bin.PutUint16(prefix[36:], uint16(vSize))
|
||
|
||
_, err = dst.Write(prefix)
|
||
if err != nil {
|
||
return
|
||
}
|
||
// copy timestamps
|
||
writeChunks(dst, metric.Timestamps, tSize)
|
||
// copy values
|
||
writeChunks(dst, metric.Values, vSize)
|
||
}
|
||
// free data pages
|
||
_, err = bin.WriteVarSize(dst, snapshot.DataFreeList.Pages())
|
||
if err != nil {
|
||
return
|
||
}
|
||
err = freeListWriteTo(snapshot.DataFreeList, dst)
|
||
if err != nil {
|
||
return
|
||
}
|
||
// free index pages
|
||
_, err = bin.WriteVarSize(dst, snapshot.IndexFreeList.Pages())
|
||
if err != nil {
|
||
return
|
||
}
|
||
err = freeListWriteTo(snapshot.IndexFreeList, dst)
|
||
if err != nil {
|
||
return
|
||
}
|
||
|
||
bin.WriteUint32(file, hasher.Sum32())
|
||
|
||
err = file.Sync()
|
||
if err != nil {
|
||
return
|
||
}
|
||
|
||
err = file.Close()
|
||
if err != nil {
|
||
return
|
||
}
|
||
// копіюю сторінки із delta файла в base файл і потім роблю Truncate
|
||
err = snapshot.DataFreeList.Merge() // fix - get frozen pages count + unfilled
|
||
if err != nil {
|
||
return
|
||
}
|
||
err = snapshot.IndexFreeList.Merge()
|
||
if err != nil {
|
||
return
|
||
}
|
||
|
||
// prevLogNumber := logNumber - 1
|
||
// prevChanges := filepath.Join(s.dir, fmt.Sprintf("%d.changes", prevLogNumber))
|
||
// prevSnapshot := filepath.Join(s.dir, fmt.Sprintf("%d.snapshot", prevLogNumber))
|
||
|
||
// isExist, err := isFileExist(prevChanges)
|
||
// if err != nil {
|
||
// return
|
||
// }
|
||
|
||
// if isExist {
|
||
// err = os.Remove(prevChanges)
|
||
// if err != nil {
|
||
// qb.Abort(qb.DeletePrevChangesFileFailed, err)
|
||
// }
|
||
// }
|
||
|
||
// isExist, err = isFileExist(prevSnapshot)
|
||
// if err != nil {
|
||
// return
|
||
// }
|
||
|
||
// if isExist {
|
||
// err = os.Remove(prevSnapshot)
|
||
// if err != nil {
|
||
// qb.Abort(qb.DeletePrevSnapshotFileFailed, err)
|
||
// }
|
||
// }
|
||
return
|
||
}
|
||
|
||
// HELPERS
|
||
|
||
func freeListWriteTo(freeList *freelist.FreeList, dst io.Writer) error {
|
||
serialized, err := freeList.Serialize()
|
||
if err != nil {
|
||
qb.Abort(qb.FailedFreeListSerialize, err)
|
||
}
|
||
_, err = bin.WriteVarSize(dst, len(serialized))
|
||
if err != nil {
|
||
return err
|
||
}
|
||
_, err = dst.Write(serialized)
|
||
if err != nil {
|
||
return err
|
||
}
|
||
return nil
|
||
}
|
||
|
||
func writeChunks(dst io.Writer, chunks [][]byte, size int) (err error) {
|
||
remaining := size
|
||
for _, buf := range chunks {
|
||
if remaining < len(buf) {
|
||
buf = buf[:remaining]
|
||
}
|
||
_, err = dst.Write(buf)
|
||
if err != nil {
|
||
return
|
||
}
|
||
remaining -= len(buf)
|
||
if remaining == 0 {
|
||
break
|
||
}
|
||
}
|
||
return
|
||
}
|