package storage import ( "github.com/chrislusf/weed-fs/go/glog" "github.com/chrislusf/weed-fs/go/util" "fmt" "io" "os" ) type NeedleMapper interface { Put(key uint64, offset uint32, size uint32) (int, error) Get(key uint64) (element *NeedleValue, ok bool) Delete(key uint64) error Close() Destroy() error ContentSize() uint64 DeletedSize() uint64 FileCount() int DeletedCount() int Visit(visit func(NeedleValue) error) (err error) MaxFileKey() uint64 } type mapMetric struct { DeletionCounter int `json:"DeletionCounter"` FileCounter int `json:"FileCounter"` DeletionByteCounter uint64 `json:"DeletionByteCounter"` FileByteCounter uint64 `json:"FileByteCounter"` MaximumFileKey uint64 `json:"MaxFileKey"` } type NeedleMap struct { indexFile *os.File m CompactMap mapMetric } func NewNeedleMap(file *os.File) *NeedleMap { nm := &NeedleMap{ m: NewCompactMap(), indexFile: file, } return nm } const ( RowsToRead = 1024 ) func LoadNeedleMap(file *os.File) (*NeedleMap, error) { nm := NewNeedleMap(file) e := WalkIndexFile(file, func(key uint64, offset, size uint32) error { if key > nm.MaximumFileKey { nm.MaximumFileKey = key } nm.FileCounter++ nm.FileByteCounter = nm.FileByteCounter + uint64(size) if offset > 0 { oldSize := nm.m.Set(Key(key), offset, size) glog.V(3).Infoln("reading key", key, "offset", offset, "size", size, "oldSize", oldSize) if oldSize > 0 { nm.DeletionCounter++ nm.DeletionByteCounter = nm.DeletionByteCounter + uint64(oldSize) } } else { oldSize := nm.m.Delete(Key(key)) glog.V(3).Infoln("removing key", key, "offset", offset, "size", size, "oldSize", oldSize) nm.DeletionCounter++ nm.DeletionByteCounter = nm.DeletionByteCounter + uint64(oldSize) } return nil }) glog.V(1).Infoln("max file key:", nm.MaximumFileKey) return nm, e } // walks through the index file, calls fn function with each key, offset, size // stops with the error returned by the fn function func WalkIndexFile(r *os.File, fn func(key uint64, offset, size uint32) error) error { var readerOffset int64 bytes := make([]byte, 16*RowsToRead) count, e := r.ReadAt(bytes, readerOffset) glog.V(3).Infoln("file", r.Name(), "readerOffset", readerOffset, "count", count, "e", e) readerOffset += int64(count) var ( key uint64 offset, size uint32 i int ) for count > 0 && e == nil || e == io.EOF { for i = 0; i+16 <= count; i += 16 { key = util.BytesToUint64(bytes[i : i+8]) offset = util.BytesToUint32(bytes[i+8 : i+12]) size = util.BytesToUint32(bytes[i+12 : i+16]) if e = fn(key, offset, size); e != nil { return e } } if e == io.EOF { return nil } count, e = r.ReadAt(bytes, readerOffset) glog.V(3).Infoln("file", r.Name(), "readerOffset", readerOffset, "count", count, "e", e) readerOffset += int64(count) } return e } func (nm *NeedleMap) Put(key uint64, offset uint32, size uint32) (int, error) { if key > nm.MaximumFileKey { nm.MaximumFileKey = key } oldSize := nm.m.Set(Key(key), offset, size) bytes := make([]byte, 16) util.Uint64toBytes(bytes[0:8], key) util.Uint32toBytes(bytes[8:12], offset) util.Uint32toBytes(bytes[12:16], size) nm.FileCounter++ nm.FileByteCounter = nm.FileByteCounter + uint64(size) if oldSize > 0 { nm.DeletionCounter++ nm.DeletionByteCounter = nm.DeletionByteCounter + uint64(oldSize) } if _, err := nm.indexFile.Seek(0, 2); err != nil { return 0, fmt.Errorf("cannot go to the end of indexfile %s: %s", nm.indexFile.Name(), err.Error()) } return nm.indexFile.Write(bytes) } func (nm *NeedleMap) Get(key uint64) (element *NeedleValue, ok bool) { element, ok = nm.m.Get(Key(key)) return } func (nm *NeedleMap) Delete(key uint64) error { nm.DeletionByteCounter = nm.DeletionByteCounter + uint64(nm.m.Delete(Key(key))) bytes := make([]byte, 16) util.Uint64toBytes(bytes[0:8], key) util.Uint32toBytes(bytes[8:12], 0) util.Uint32toBytes(bytes[12:16], 0) if _, err := nm.indexFile.Seek(0, 2); err != nil { return fmt.Errorf("cannot go to the end of indexfile %s: %s", nm.indexFile.Name(), err.Error()) } if _, err := nm.indexFile.Write(bytes); err != nil { return fmt.Errorf("error writing to indexfile %s: %s", nm.indexFile.Name(), err.Error()) } nm.DeletionCounter++ return nil } func (nm *NeedleMap) Close() { _ = nm.indexFile.Close() } func (nm *NeedleMap) Destroy() error { nm.Close() return os.Remove(nm.indexFile.Name()) } func (nm NeedleMap) ContentSize() uint64 { return nm.FileByteCounter } func (nm NeedleMap) DeletedSize() uint64 { return nm.DeletionByteCounter } func (nm NeedleMap) FileCount() int { return nm.FileCounter } func (nm NeedleMap) DeletedCount() int { return nm.DeletionCounter } func (nm *NeedleMap) Visit(visit func(NeedleValue) error) (err error) { return nm.m.Visit(visit) } func (nm NeedleMap) MaxFileKey() uint64 { return nm.MaximumFileKey }