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package filer
import (
"bytes"
"encoding/hex"
"fmt"
"math"
"sort"
"sync"
"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
"github.com/chrislusf/seaweedfs/weed/util"
)
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
}
md5_digests := [][]byte{}
for _, c := range chunks {
md5_decoded, _ := hex.DecodeString(c.ETag)
md5_digests = append(md5_digests, md5_decoded)
}
return fmt.Sprintf("%x-%d", util.Md5(bytes.Join(md5_digests, nil)), len(chunks))
}
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) %s %d", name, v.start, v.stop, v.fileId, v.chunkOffset)
}
*/
}
var bufPool = sync.Pool{
New: func() interface{} {
return new(VisibleInterval)
},
}
func MergeIntoVisibles(visibles []VisibleInterval, chunk *filer_pb.FileChunk) (newVisibles []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)
// glog.V(0).Infof("newVisibles %d adding chunk [%d,%d) %s size:%d", len(newVisibles), chunk.Offset, chunk.Offset+int64(chunk.Size), chunk.GetFileIdString(), chunk.Size)
chunkStop := chunk.Offset + int64(chunk.Size)
for _, v := range visibles {
if v.start < chunk.Offset && chunk.Offset < v.stop {
t := newVisibleInterval(v.start, chunk.Offset, v.fileId, v.modifiedTime, v.chunkOffset, v.chunkSize, v.cipherKey, v.isGzipped)
newVisibles = append(newVisibles, t)
// glog.V(0).Infof("visible %d [%d,%d) =1> [%d,%d)", i, v.start, v.stop, t.start, t.stop)
}
if v.start < chunkStop && chunkStop < v.stop {
t := newVisibleInterval(chunkStop, v.stop, v.fileId, v.modifiedTime, v.chunkOffset+(chunkStop-v.start), v.chunkSize, v.cipherKey, v.isGzipped)
newVisibles = append(newVisibles, t)
// glog.V(0).Infof("visible %d [%d,%d) =2> [%d,%d)", i, v.start, v.stop, t.start, t.stop)
}
if chunkStop <= v.start || v.stop <= chunk.Offset {
newVisibles = append(newVisibles, v)
// glog.V(0).Infof("visible %d [%d,%d) =3> [%d,%d)", i, v.start, v.stop, v.start, v.stop)
}
}
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 {
if chunks[i].Mtime == chunks[j].Mtime {
filer_pb.EnsureFid(chunks[i])
filer_pb.EnsureFid(chunks[j])
if chunks[i].Fid == nil || chunks[j].Fid == nil {
return true
}
return chunks[i].Fid.FileKey < chunks[j].Fid.FileKey
}
return chunks[i].Mtime < chunks[j].Mtime // keep this to make tests run
})
for _, chunk := range chunks {
// glog.V(0).Infof("merge [%d,%d)", chunk.Offset, chunk.Offset+int64(chunk.Size))
visibles = MergeIntoVisibles(visibles, chunk)
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
}
|
