package filer import ( "github.com/chrislusf/seaweedfs/weed/pb/filer_pb" "golang.org/x/exp/slices" ) func readResolvedChunks(chunks []*filer_pb.FileChunk) (visibles []VisibleInterval) { var points []*Point for _, chunk := range chunks { points = append(points, &Point{ x: chunk.Offset, ts: chunk.Mtime, chunk: chunk, isStart: true, }) points = append(points, &Point{ x: chunk.Offset + int64(chunk.Size), ts: chunk.Mtime, chunk: chunk, isStart: false, }) } slices.SortFunc(points, func(a, b *Point) bool { if a.x != b.x { return a.x < b.x } if a.ts != b.ts { return a.ts < b.ts } return !a.isStart }) var prevX int64 var queue []*Point for _, point := range points { if point.isStart { if len(queue) > 0 { lastIndex := len(queue) - 1 lastPoint := queue[lastIndex] if point.x != prevX && lastPoint.ts < point.ts { visibles = addToVisibles(visibles, prevX, lastPoint, point) prevX = point.x } } // insert into queue for i := len(queue); i >= 0; i-- { if i == 0 || queue[i-1].ts <= point.ts { if i == len(queue) { prevX = point.x } queue = addToQueue(queue, i, point) break } } } else { lastIndex := len(queue) - 1 index := lastIndex var startPoint *Point for ; index >= 0; index-- { startPoint = queue[index] if startPoint.ts == point.ts { queue = removeFromQueue(queue, index) break } } if index == lastIndex && startPoint != nil { visibles = addToVisibles(visibles, prevX, startPoint, point) prevX = point.x } } } return } func removeFromQueue(queue []*Point, index int) []*Point { for i := index; i < len(queue)-1; i++ { queue[i] = queue[i+1] } queue = queue[:len(queue)-1] return queue } func addToQueue(queue []*Point, index int, point *Point) []*Point { queue = append(queue, point) for i := len(queue) - 1; i > index; i-- { queue[i], queue[i-1] = queue[i-1], queue[i] } return queue } func addToVisibles(visibles []VisibleInterval, prevX int64, startPoint *Point, point *Point) []VisibleInterval { if prevX < point.x { chunk := startPoint.chunk visibles = append(visibles, VisibleInterval{ start: prevX, stop: point.x, fileId: chunk.GetFileIdString(), modifiedTime: chunk.Mtime, chunkOffset: prevX - chunk.Offset, chunkSize: chunk.Size, cipherKey: chunk.CipherKey, isGzipped: chunk.IsCompressed, }) } return visibles } type Point struct { x int64 ts int64 chunk *filer_pb.FileChunk isStart bool }