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filechunk_group.go
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/
filechunk_group.go
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package filer
import (
"github.com/seaweedfs/seaweedfs/weed/pb/filer_pb"
"github.com/seaweedfs/seaweedfs/weed/util/chunk_cache"
"github.com/seaweedfs/seaweedfs/weed/wdclient"
"sync"
)
type ChunkGroup struct {
lookupFn wdclient.LookupFileIdFunctionType
chunkCache chunk_cache.ChunkCache
sections map[SectionIndex]*FileChunkSection
sectionsLock sync.RWMutex
readerCache *ReaderCache
}
func NewChunkGroup(lookupFn wdclient.LookupFileIdFunctionType, chunkCache chunk_cache.ChunkCache, chunks []*filer_pb.FileChunk) (*ChunkGroup, error) {
group := &ChunkGroup{
lookupFn: lookupFn,
chunkCache: chunkCache,
sections: make(map[SectionIndex]*FileChunkSection),
readerCache: NewReaderCache(32, chunkCache, lookupFn),
}
err := group.SetChunks(chunks)
return group, err
}
func (group *ChunkGroup) AddChunk(chunk *filer_pb.FileChunk) error {
group.sectionsLock.Lock()
defer group.sectionsLock.Unlock()
sectionIndexStart, sectionIndexStop := SectionIndex(chunk.Offset/SectionSize), SectionIndex((chunk.Offset+int64(chunk.Size))/SectionSize)
for si := sectionIndexStart; si < sectionIndexStop+1; si++ {
section, found := group.sections[si]
if !found {
section = NewFileChunkSection(si)
group.sections[si] = section
}
section.addChunk(chunk)
}
return nil
}
func (group *ChunkGroup) ReadDataAt(fileSize int64, buff []byte, offset int64) (n int, tsNs int64, err error) {
group.sectionsLock.RLock()
defer group.sectionsLock.RUnlock()
sectionIndexStart, sectionIndexStop := SectionIndex(offset/SectionSize), SectionIndex((offset+int64(len(buff)))/SectionSize)
for si := sectionIndexStart; si < sectionIndexStop+1; si++ {
section, found := group.sections[si]
rangeStart, rangeStop := max(offset, int64(si*SectionSize)), min(offset+int64(len(buff)), int64((si+1)*SectionSize))
if !found {
for i := rangeStart; i < rangeStop; i++ {
buff[i-offset] = 0
}
continue
}
xn, xTsNs, xErr := section.readDataAt(group, fileSize, buff[rangeStart-offset:rangeStop-offset], rangeStart)
if xErr != nil {
err = xErr
}
n += xn
tsNs = max(tsNs, xTsNs)
}
return
}
func (group *ChunkGroup) SetChunks(chunks []*filer_pb.FileChunk) error {
group.sectionsLock.RLock()
defer group.sectionsLock.RUnlock()
var dataChunks []*filer_pb.FileChunk
for _, chunk := range chunks {
if !chunk.IsChunkManifest {
dataChunks = append(dataChunks, chunk)
continue
}
resolvedChunks, err := ResolveOneChunkManifest(group.lookupFn, chunk)
if err != nil {
return err
}
dataChunks = append(dataChunks, resolvedChunks...)
}
sections := make(map[SectionIndex]*FileChunkSection)
for _, chunk := range dataChunks {
sectionIndexStart, sectionIndexStop := SectionIndex(chunk.Offset/SectionSize), SectionIndex((chunk.Offset+int64(chunk.Size))/SectionSize)
for si := sectionIndexStart; si < sectionIndexStop+1; si++ {
section, found := sections[si]
if !found {
section = NewFileChunkSection(si)
sections[si] = section
}
section.chunks = append(section.chunks, chunk)
}
}
group.sections = sections
return nil
}
const (
// see weedfs_file_lseek.go
SEEK_DATA uint32 = 3 // seek to next data after the offset
// SEEK_HOLE uint32 = 4 // seek to next hole after the offset
)
// FIXME: needa tests
func (group *ChunkGroup) SearchChunks(offset, fileSize int64, whence uint32) (found bool, out int64) {
group.sectionsLock.RLock()
defer group.sectionsLock.RUnlock()
return group.doSearchChunks(offset, fileSize, whence)
}
func (group *ChunkGroup) doSearchChunks(offset, fileSize int64, whence uint32) (found bool, out int64) {
sectionIndex, maxSectionIndex := SectionIndex(offset/SectionSize), SectionIndex(fileSize/SectionSize)
if whence == SEEK_DATA {
for si := sectionIndex; si < maxSectionIndex+1; si++ {
section, foundSection := group.sections[si]
if !foundSection {
continue
}
sectionStart := section.DataStartOffset(group, offset, fileSize)
if sectionStart == -1 {
continue
}
return true, sectionStart
}
return false, 0
} else {
// whence == SEEK_HOLE
for si := sectionIndex; si < maxSectionIndex; si++ {
section, foundSection := group.sections[si]
if !foundSection {
return true, offset
}
holeStart := section.NextStopOffset(group, offset, fileSize)
if holeStart%SectionSize == 0 {
continue
}
return true, holeStart
}
return true, fileSize
}
}