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package page_writer
import (
"github.com/seaweedfs/seaweedfs/weed/util/log"
"github.com/seaweedfs/seaweedfs/weed/util"
"github.com/seaweedfs/seaweedfs/weed/util/mem"
"io"
"os"
"sync"
)
var (
_ = PageChunk(&SwapFileChunk{})
)
type ActualChunkIndex int
type SwapFile struct {
dir string
file *os.File
chunkSize int64
chunkTrackingLock sync.Mutex
activeChunkCount int
freeActualChunkList []ActualChunkIndex
}
type SwapFileChunk struct {
sync.RWMutex
swapfile *SwapFile
usage *ChunkWrittenIntervalList
logicChunkIndex LogicChunkIndex
actualChunkIndex ActualChunkIndex
activityScore *ActivityScore
//memChunk *MemChunk
}
func NewSwapFile(dir string, chunkSize int64) *SwapFile {
return &SwapFile{
dir: dir,
file: nil,
chunkSize: chunkSize,
}
}
func (sf *SwapFile) FreeResource() {
if sf.file != nil {
sf.file.Close()
os.Remove(sf.file.Name())
}
}
func (sf *SwapFile) NewSwapFileChunk(logicChunkIndex LogicChunkIndex) (tc *SwapFileChunk) {
if sf.file == nil {
var err error
sf.file, err = os.CreateTemp(sf.dir, "")
if err != nil {
log.Errorf("create swap file: %v", err)
return nil
}
}
sf.chunkTrackingLock.Lock()
defer sf.chunkTrackingLock.Unlock()
sf.activeChunkCount++
// assign a new physical chunk
var actualChunkIndex ActualChunkIndex
if len(sf.freeActualChunkList) > 0 {
actualChunkIndex = sf.freeActualChunkList[0]
sf.freeActualChunkList = sf.freeActualChunkList[1:]
} else {
actualChunkIndex = ActualChunkIndex(sf.activeChunkCount)
}
swapFileChunk := &SwapFileChunk{
swapfile: sf,
usage: newChunkWrittenIntervalList(),
logicChunkIndex: logicChunkIndex,
actualChunkIndex: actualChunkIndex,
activityScore: NewActivityScore(),
// memChunk: NewMemChunk(logicChunkIndex, sf.chunkSize),
}
// println(logicChunkIndex, "|", "++++", swapFileChunk.actualChunkIndex, swapFileChunk, sf)
return swapFileChunk
}
func (sc *SwapFileChunk) FreeResource() {
sc.Lock()
defer sc.Unlock()
sc.swapfile.chunkTrackingLock.Lock()
defer sc.swapfile.chunkTrackingLock.Unlock()
sc.swapfile.freeActualChunkList = append(sc.swapfile.freeActualChunkList, sc.actualChunkIndex)
sc.swapfile.activeChunkCount--
// println(sc.logicChunkIndex, "|", "----", sc.actualChunkIndex, sc, sc.swapfile)
}
func (sc *SwapFileChunk) WriteDataAt(src []byte, offset int64, tsNs int64) (n int) {
sc.Lock()
defer sc.Unlock()
// println(sc.logicChunkIndex, "|", tsNs, "write at", offset, len(src), sc.actualChunkIndex)
innerOffset := offset % sc.swapfile.chunkSize
var err error
n, err = sc.swapfile.file.WriteAt(src, int64(sc.actualChunkIndex)*sc.swapfile.chunkSize+innerOffset)
sc.usage.MarkWritten(innerOffset, innerOffset+int64(n), tsNs)
if err != nil {
log.Errorf("failed to write swap file %s: %v", sc.swapfile.file.Name(), err)
}
//sc.memChunk.WriteDataAt(src, offset, tsNs)
sc.activityScore.MarkWrite()
return
}
func (sc *SwapFileChunk) ReadDataAt(p []byte, off int64, tsNs int64) (maxStop int64) {
sc.RLock()
defer sc.RUnlock()
// println(sc.logicChunkIndex, "|", tsNs, "read at", off, len(p), sc.actualChunkIndex)
//memCopy := make([]byte, len(p))
//copy(memCopy, p)
chunkStartOffset := int64(sc.logicChunkIndex) * sc.swapfile.chunkSize
for t := sc.usage.head.next; t != sc.usage.tail; t = t.next {
logicStart := max(off, chunkStartOffset+t.StartOffset)
logicStop := min(off+int64(len(p)), chunkStartOffset+t.stopOffset)
if logicStart < logicStop {
actualStart := logicStart - chunkStartOffset + int64(sc.actualChunkIndex)*sc.swapfile.chunkSize
if n, err := sc.swapfile.file.ReadAt(p[logicStart-off:logicStop-off], actualStart); err != nil {
if err == io.EOF && n == int(logicStop-logicStart) {
err = nil
}
log.Errorf("failed to reading swap file %s: %v", sc.swapfile.file.Name(), err)
break
}
maxStop = max(maxStop, logicStop)
if t.TsNs > tsNs {
println("read new data2", t.TsNs-tsNs, "ns")
}
}
}
//sc.memChunk.ReadDataAt(memCopy, off, tsNs)
//if bytes.Compare(memCopy, p) != 0 {
// println("read wrong data from swap file", off, sc.logicChunkIndex)
//}
sc.activityScore.MarkRead()
return
}
func (sc *SwapFileChunk) IsComplete() bool {
sc.RLock()
defer sc.RUnlock()
return sc.usage.IsComplete(sc.swapfile.chunkSize)
}
func (sc *SwapFileChunk) ActivityScore() int64 {
return sc.activityScore.ActivityScore()
}
func (sc *SwapFileChunk) WrittenSize() int64 {
sc.RLock()
defer sc.RUnlock()
return sc.usage.WrittenSize()
}
func (sc *SwapFileChunk) SaveContent(saveFn SaveToStorageFunc) {
sc.RLock()
defer sc.RUnlock()
if saveFn == nil {
return
}
// println(sc.logicChunkIndex, "|", "save")
for t := sc.usage.head.next; t != sc.usage.tail; t = t.next {
startOffset := t.StartOffset
stopOffset := t.stopOffset
tsNs := t.TsNs
for t != sc.usage.tail && t.next.StartOffset == stopOffset {
stopOffset = t.next.stopOffset
t = t.next
tsNs = max(tsNs, t.TsNs)
}
data := mem.Allocate(int(stopOffset - startOffset))
n, _ := sc.swapfile.file.ReadAt(data, startOffset+int64(sc.actualChunkIndex)*sc.swapfile.chunkSize)
if n > 0 {
reader := util.NewBytesReader(data[:n])
saveFn(reader, int64(sc.logicChunkIndex)*sc.swapfile.chunkSize+startOffset, int64(n), tsNs, func() {
})
}
mem.Free(data)
}
}
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