package erasure_coding import ( "fmt" "os" "path" "strconv" "github.com/chrislusf/seaweedfs/weed/storage/needle" ) type ShardId uint8 type EcVolumeShard struct { VolumeId needle.VolumeId ShardId ShardId Collection string dir string ecdFile *os.File ecdFileSize int64 } func NewEcVolumeShard(dirname string, collection string, id needle.VolumeId, shardId ShardId) (v *EcVolumeShard, e error) { v = &EcVolumeShard{dir: dirname, Collection: collection, VolumeId: id, ShardId: shardId} baseFileName := v.FileName() // open ecd file if v.ecdFile, e = os.OpenFile(baseFileName+ToExt(int(shardId)), os.O_RDONLY, 0644); e != nil { return nil, fmt.Errorf("cannot read ec volume shard %s.%s: %v", baseFileName, ToExt(int(shardId)), e) } ecdFi, statErr := v.ecdFile.Stat() if statErr != nil { return nil, fmt.Errorf("can not stat ec volume shard %s.%s: %v", baseFileName, ToExt(int(shardId)), statErr) } v.ecdFileSize = ecdFi.Size() return } func (shard *EcVolumeShard) Size() int64 { return shard.ecdFileSize } func (shard *EcVolumeShard) String() string { return fmt.Sprintf("ec shard %v:%v, dir:%s, Collection:%s", shard.VolumeId, shard.ShardId, shard.dir, shard.Collection) } func (shard *EcVolumeShard) FileName() (fileName string) { return EcShardFileName(shard.Collection, shard.dir, int(shard.VolumeId)) } func EcShardFileName(collection string, dir string, id int) (fileName string) { idString := strconv.Itoa(id) if collection == "" { fileName = path.Join(dir, idString) } else { fileName = path.Join(dir, collection+"_"+idString) } return } func EcShardBaseFileName(collection string, id int) (baseFileName string) { baseFileName = strconv.Itoa(id) if collection != "" { baseFileName = collection+"_"+baseFileName } return } func (shard *EcVolumeShard) Close() { if shard.ecdFile != nil { _ = shard.ecdFile.Close() shard.ecdFile = nil } } func (shard *EcVolumeShard) Destroy() { os.Remove(shard.FileName() + ToExt(int(shard.ShardId))) } func (shard *EcVolumeShard) ReadAt(buf []byte, offset int64) (int, error) { return shard.ecdFile.ReadAt(buf, offset) }