You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
94 lines
2.5 KiB
94 lines
2.5 KiB
package filer
|
|
|
|
import (
|
|
"github.com/seaweedfs/seaweedfs/weed/pb/filer_pb"
|
|
"sync"
|
|
)
|
|
|
|
const SectionSize = 2 * 1024 * 1024 * 128 // 256MiB
|
|
type SectionIndex int64
|
|
type FileChunkSection struct {
|
|
sectionIndex SectionIndex
|
|
chunks []*filer_pb.FileChunk
|
|
entryViewCache []VisibleInterval
|
|
chunkViews []*ChunkView
|
|
reader *ChunkReadAt
|
|
lock sync.Mutex
|
|
}
|
|
|
|
func (section *FileChunkSection) addChunk(chunk *filer_pb.FileChunk) error {
|
|
section.lock.Lock()
|
|
defer section.lock.Unlock()
|
|
section.chunks = append(section.chunks, chunk)
|
|
// FIXME: this can be improved to an incremental change
|
|
section.entryViewCache = nil
|
|
return nil
|
|
}
|
|
|
|
func (section *FileChunkSection) readDataAt(group *ChunkGroup, fileSize int64, buff []byte, offset int64) (n int, tsNs int64, err error) {
|
|
section.lock.Lock()
|
|
defer section.lock.Unlock()
|
|
|
|
section.setupForRead(group, fileSize)
|
|
|
|
return section.reader.ReadAtWithTime(buff, offset)
|
|
}
|
|
|
|
func (section *FileChunkSection) setupForRead(group *ChunkGroup, fileSize int64) {
|
|
if section.entryViewCache == nil {
|
|
section.entryViewCache = readResolvedChunks(section.chunks)
|
|
section.chunks, _ = SeparateGarbageChunks(section.entryViewCache, section.chunks)
|
|
if section.reader != nil {
|
|
_ = section.reader.Close()
|
|
section.reader = nil
|
|
}
|
|
}
|
|
|
|
if section.reader == nil {
|
|
chunkViews := ViewFromVisibleIntervals(section.entryViewCache, int64(section.sectionIndex)*SectionSize, (int64(section.sectionIndex)+1)*SectionSize)
|
|
section.reader = NewChunkReaderAtFromClient(group.lookupFn, chunkViews, group.chunkCache, min(int64(section.sectionIndex+1)*SectionSize, fileSize))
|
|
}
|
|
}
|
|
|
|
func (section *FileChunkSection) DataStartOffset(group *ChunkGroup, offset int64, fileSize int64) int64 {
|
|
section.lock.Lock()
|
|
defer section.lock.Unlock()
|
|
|
|
section.setupForRead(group, fileSize)
|
|
|
|
for _, visible := range section.entryViewCache {
|
|
if visible.stop <= offset {
|
|
continue
|
|
}
|
|
if offset < visible.start {
|
|
return offset
|
|
}
|
|
return offset
|
|
}
|
|
return -1
|
|
}
|
|
|
|
func (section *FileChunkSection) NextStopOffset(group *ChunkGroup, offset int64, fileSize int64) int64 {
|
|
section.lock.Lock()
|
|
defer section.lock.Unlock()
|
|
|
|
section.setupForRead(group, fileSize)
|
|
|
|
isAfterOffset := false
|
|
for _, visible := range section.entryViewCache {
|
|
if !isAfterOffset {
|
|
if visible.stop <= offset {
|
|
continue
|
|
}
|
|
isAfterOffset = true
|
|
}
|
|
if offset < visible.start {
|
|
return offset
|
|
}
|
|
// now visible.start <= offset
|
|
if offset < visible.stop {
|
|
offset = visible.stop
|
|
}
|
|
}
|
|
return offset
|
|
}
|