package filer2 import ( "fmt" "hash/fnv" "math" "sort" "sync" "github.com/chrislusf/seaweedfs/weed/pb/filer_pb" ) func TotalSize(chunks []*filer_pb.FileChunk) (size uint64) { for _, c := range chunks { t := uint64(c.Offset + int64(c.Size)) if size < t { size = t } } return } func FileSize(entry *filer_pb.Entry) (size uint64) { return maxUint64(TotalSize(entry.Chunks), entry.Attributes.FileSize) } func ETag(entry *filer_pb.Entry) (etag string) { if entry.Attributes == nil || entry.Attributes.Md5 == nil { return ETagChunks(entry.Chunks) } return fmt.Sprintf("%x", entry.Attributes.Md5) } func ETagEntry(entry *Entry) (etag string) { if entry.Attr.Md5 == nil { return ETagChunks(entry.Chunks) } return fmt.Sprintf("%x", entry.Attr.Md5) } func ETagChunks(chunks []*filer_pb.FileChunk) (etag string) { if len(chunks) == 1 { return chunks[0].ETag } h := fnv.New32a() for _, c := range chunks { h.Write([]byte(c.ETag)) } return fmt.Sprintf("%x", h.Sum32()) } func CompactFileChunks(lookupFileIdFn LookupFileIdFunctionType, chunks []*filer_pb.FileChunk) (compacted, garbage []*filer_pb.FileChunk) { visibles, _ := NonOverlappingVisibleIntervals(lookupFileIdFn, chunks) fileIds := make(map[string]bool) for _, interval := range visibles { fileIds[interval.fileId] = true } for _, chunk := range chunks { if _, found := fileIds[chunk.GetFileIdString()]; found { compacted = append(compacted, chunk) } else { garbage = append(garbage, chunk) } } return } func MinusChunks(lookupFileIdFn LookupFileIdFunctionType, as, bs []*filer_pb.FileChunk) (delta []*filer_pb.FileChunk, err error) { aData, aMeta, aErr := ResolveChunkManifest(lookupFileIdFn, as) if aErr != nil { return nil, aErr } bData, bMeta, bErr := ResolveChunkManifest(lookupFileIdFn, bs) if bErr != nil { return nil, bErr } delta = append(delta, DoMinusChunks(aData, bData)...) delta = append(delta, DoMinusChunks(aMeta, bMeta)...) return } func DoMinusChunks(as, bs []*filer_pb.FileChunk) (delta []*filer_pb.FileChunk) { fileIds := make(map[string]bool) for _, interval := range bs { fileIds[interval.GetFileIdString()] = true } for _, chunk := range as { if _, found := fileIds[chunk.GetFileIdString()]; !found { delta = append(delta, chunk) } } return } type ChunkView struct { FileId string Offset int64 Size uint64 LogicOffset int64 // actual offset in the file, for the data specified via [offset, offset+size) in current chunk ChunkSize uint64 CipherKey []byte IsGzipped bool } func (cv *ChunkView) IsFullChunk() bool { return cv.Size == cv.ChunkSize } func ViewFromChunks(lookupFileIdFn LookupFileIdFunctionType, chunks []*filer_pb.FileChunk, offset int64, size int64) (views []*ChunkView) { visibles, _ := NonOverlappingVisibleIntervals(lookupFileIdFn, chunks) return ViewFromVisibleIntervals(visibles, offset, size) } func ViewFromVisibleIntervals(visibles []VisibleInterval, offset int64, size int64) (views []*ChunkView) { stop := offset + size if size == math.MaxInt64 { stop = math.MaxInt64 } if stop < offset { stop = math.MaxInt64 } for _, chunk := range visibles { chunkStart, chunkStop := max(offset, chunk.start), min(stop, chunk.stop) if chunkStart < chunkStop { views = append(views, &ChunkView{ FileId: chunk.fileId, Offset: chunkStart - chunk.start + chunk.chunkOffset, Size: uint64(chunkStop - chunkStart), LogicOffset: chunkStart, ChunkSize: chunk.chunkSize, CipherKey: chunk.cipherKey, IsGzipped: chunk.isGzipped, }) } } return views } func logPrintf(name string, visibles []VisibleInterval) { /* glog.V(0).Infof("%s len %d", name, len(visibles)) for _, v := range visibles { glog.V(0).Infof("%s: [%d,%d)", name, v.start, v.stop) } */ } var bufPool = sync.Pool{ New: func() interface{} { return new(VisibleInterval) }, } func MergeIntoVisibles(visibles, newVisibles []VisibleInterval, chunk *filer_pb.FileChunk) []VisibleInterval { newV := newVisibleInterval(chunk.Offset, chunk.Offset+int64(chunk.Size), chunk.GetFileIdString(), chunk.Mtime, 0, chunk.Size, chunk.CipherKey, chunk.IsCompressed) length := len(visibles) if length == 0 { return append(visibles, newV) } last := visibles[length-1] if last.stop <= chunk.Offset { return append(visibles, newV) } logPrintf(" before", visibles) chunkStop := chunk.Offset + int64(chunk.Size) for _, v := range visibles { if v.start < chunk.Offset && chunk.Offset < v.stop { newVisibles = append(newVisibles, newVisibleInterval(v.start, chunk.Offset, v.fileId, v.modifiedTime, v.chunkOffset, v.chunkSize, v.cipherKey, v.isGzipped)) } if v.start < chunkStop && chunkStop < v.stop { newVisibles = append(newVisibles, newVisibleInterval(chunkStop, v.stop, v.fileId, v.modifiedTime, v.chunkOffset+(chunkStop-v.start), v.chunkSize, v.cipherKey, v.isGzipped)) } if chunkStop <= v.start || v.stop <= chunk.Offset { newVisibles = append(newVisibles, v) } } newVisibles = append(newVisibles, newV) logPrintf(" append", newVisibles) for i := len(newVisibles) - 1; i >= 0; i-- { if i > 0 && newV.start < newVisibles[i-1].start { newVisibles[i] = newVisibles[i-1] } else { newVisibles[i] = newV break } } logPrintf(" sorted", newVisibles) return newVisibles } // NonOverlappingVisibleIntervals translates the file chunk into VisibleInterval in memory // If the file chunk content is a chunk manifest func NonOverlappingVisibleIntervals(lookupFileIdFn LookupFileIdFunctionType, chunks []*filer_pb.FileChunk) (visibles []VisibleInterval, err error) { chunks, _, err = ResolveChunkManifest(lookupFileIdFn, chunks) sort.Slice(chunks, func(i, j int) bool { return chunks[i].Mtime < chunks[j].Mtime }) var newVisibles []VisibleInterval for _, chunk := range chunks { // glog.V(0).Infof("merge [%d,%d)", chunk.Offset, chunk.Offset+int64(chunk.Size)) newVisibles = MergeIntoVisibles(visibles, newVisibles, chunk) t := visibles[:0] visibles = newVisibles newVisibles = t logPrintf("add", visibles) } return } // find non-overlapping visible intervals // visible interval map to one file chunk type VisibleInterval struct { start int64 stop int64 modifiedTime int64 fileId string chunkOffset int64 chunkSize uint64 cipherKey []byte isGzipped bool } func newVisibleInterval(start, stop int64, fileId string, modifiedTime int64, chunkOffset int64, chunkSize uint64, cipherKey []byte, isGzipped bool) VisibleInterval { return VisibleInterval{ start: start, stop: stop, fileId: fileId, modifiedTime: modifiedTime, chunkOffset: chunkOffset, // the starting position in the chunk chunkSize: chunkSize, cipherKey: cipherKey, isGzipped: isGzipped, } } func min(x, y int64) int64 { if x <= y { return x } return y } func max(x, y int64) int64 { if x <= y { return y } return x }