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package page_writer
import (
"github.com/chrislusf/seaweedfs/weed/glog"
"github.com/chrislusf/seaweedfs/weed/util"
"github.com/chrislusf/seaweedfs/weed/util/mem"
"sync"
"sync/atomic"
)
type UploadPipeline struct {
writableChunks map[LogicChunkIndex]*MemChunk
writableChunksLock sync.Mutex
sealedChunks map[LogicChunkIndex]*SealedChunk
sealedChunksLock sync.Mutex
ChunkSize int64
writers *util.LimitedConcurrentExecutor
activeWriterCond *sync.Cond
activeWriterCount int32
saveToStorageFn SaveToStorageFunc
}
type SealedChunk struct {
chunk *MemChunk
referenceCounter int // track uploading or reading processes
}
func (sc *SealedChunk) FreeReference() {
sc.referenceCounter--
if sc.referenceCounter == 0 {
mem.Free(sc.chunk.buf)
}
}
func NewUploadPipeline(writers *util.LimitedConcurrentExecutor, chunkSize int64, saveToStorageFn SaveToStorageFunc) *UploadPipeline {
return &UploadPipeline{
ChunkSize: chunkSize,
writableChunks: make(map[LogicChunkIndex]*MemChunk),
sealedChunks: make(map[LogicChunkIndex]*SealedChunk),
writers: writers,
activeWriterCond: sync.NewCond(&sync.Mutex{}),
saveToStorageFn: saveToStorageFn,
}
}
func (cw *UploadPipeline) SaveDataAt(p []byte, off int64) (n int) {
cw.writableChunksLock.Lock()
defer cw.writableChunksLock.Unlock()
logicChunkIndex := LogicChunkIndex(off / cw.ChunkSize)
offsetRemainder := off % cw.ChunkSize
memChunk, found := cw.writableChunks[logicChunkIndex]
if !found {
memChunk = &MemChunk{
buf: mem.Allocate(int(cw.ChunkSize)),
usage: newChunkWrittenIntervalList(),
}
cw.writableChunks[logicChunkIndex] = memChunk
}
n = copy(memChunk.buf[offsetRemainder:], p)
memChunk.usage.MarkWritten(offsetRemainder, offsetRemainder+int64(n))
cw.maybeMoveToSealed(memChunk, logicChunkIndex)
return
}
func (cw *UploadPipeline) MaybeReadDataAt(p []byte, off int64) (maxStop int64) {
logicChunkIndex := LogicChunkIndex(off / cw.ChunkSize)
// read from sealed chunks first
cw.sealedChunksLock.Lock()
sealedChunk, found := cw.sealedChunks[logicChunkIndex]
if found {
sealedChunk.referenceCounter++
}
cw.sealedChunksLock.Unlock()
if found {
maxStop = readMemChunk(sealedChunk.chunk, p, off, logicChunkIndex, cw.ChunkSize)
sealedChunk.FreeReference()
}
// read from writable chunks last
cw.writableChunksLock.Lock()
defer cw.writableChunksLock.Unlock()
writableChunk, found := cw.writableChunks[logicChunkIndex]
if !found {
return
}
maxStop = max(maxStop, readMemChunk(writableChunk, p, off, logicChunkIndex, cw.ChunkSize))
return
}
func (cw *UploadPipeline) FlushAll() {
cw.writableChunksLock.Lock()
defer cw.writableChunksLock.Unlock()
for logicChunkIndex, memChunk := range cw.writableChunks {
cw.moveToSealed(memChunk, logicChunkIndex)
}
cw.waitForCurrentWritersToComplete()
}
func (cw *UploadPipeline) waitForCurrentWritersToComplete() {
cw.activeWriterCond.L.Lock()
t := int32(100)
for {
t = atomic.LoadInt32(&cw.activeWriterCount)
if t <= 0 {
break
}
glog.V(4).Infof("activeWriterCond is %d", t)
cw.activeWriterCond.Wait()
}
cw.activeWriterCond.L.Unlock()
}
func (cw *UploadPipeline) maybeMoveToSealed(memChunk *MemChunk, logicChunkIndex LogicChunkIndex) {
if memChunk.usage.IsComplete(cw.ChunkSize) {
cw.moveToSealed(memChunk, logicChunkIndex)
}
}
func (cw *UploadPipeline) moveToSealed(memChunk *MemChunk, logicChunkIndex LogicChunkIndex) {
atomic.AddInt32(&cw.activeWriterCount, 1)
glog.V(4).Infof("activeWriterCount %d ++> %d", cw.activeWriterCount-1, cw.activeWriterCount)
cw.sealedChunksLock.Lock()
if oldMemChunk, found := cw.sealedChunks[logicChunkIndex]; found {
oldMemChunk.FreeReference()
}
sealedChunk := &SealedChunk{
chunk: memChunk,
referenceCounter: 1, // default 1 is for uploading process
}
cw.sealedChunks[logicChunkIndex] = sealedChunk
delete(cw.writableChunks, logicChunkIndex)
cw.sealedChunksLock.Unlock()
cw.writers.Execute(func() {
// first add to the file chunks
cw.saveOneChunk(sealedChunk.chunk, logicChunkIndex)
// then remove from sealed chunks
cw.sealedChunksLock.Lock()
defer cw.sealedChunksLock.Unlock()
delete(cw.sealedChunks, logicChunkIndex)
sealedChunk.FreeReference()
atomic.AddInt32(&cw.activeWriterCount, -1)
glog.V(4).Infof("activeWriterCount %d --> %d", cw.activeWriterCount+1, cw.activeWriterCount)
// Lock and Unlock are not required,
// but it may signal multiple times during one wakeup,
// and the waiting goroutine may miss some of them!
cw.activeWriterCond.L.Lock()
cw.activeWriterCond.Broadcast()
cw.activeWriterCond.L.Unlock()
})
}
func (cw *UploadPipeline) saveOneChunk(memChunk *MemChunk, logicChunkIndex LogicChunkIndex) {
if cw.saveToStorageFn == nil {
return
}
for t := memChunk.usage.head.next; t != memChunk.usage.tail; t = t.next {
reader := util.NewBytesReader(memChunk.buf[t.StartOffset:t.stopOffset])
cw.saveToStorageFn(reader, int64(logicChunkIndex)*cw.ChunkSize+t.StartOffset, t.Size(), func() {
})
}
}
func readMemChunk(memChunk *MemChunk, p []byte, off int64, logicChunkIndex LogicChunkIndex, chunkSize int64) (maxStop int64) {
memChunkBaseOffset := int64(logicChunkIndex) * chunkSize
for t := memChunk.usage.head.next; t != memChunk.usage.tail; t = t.next {
logicStart := max(off, int64(logicChunkIndex)*chunkSize+t.StartOffset)
logicStop := min(off+int64(len(p)), memChunkBaseOffset+t.stopOffset)
if logicStart < logicStop {
copy(p[logicStart-off:logicStop-off], memChunk.buf[logicStart-memChunkBaseOffset:logicStop-memChunkBaseOffset])
maxStop = max(maxStop, logicStop)
}
}
return
}
func (p2 *UploadPipeline) Shutdown() {
}
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