1package leveldb 2 3import ( 4 "github.com/syndtr/goleveldb/leveldb/storage" 5 "sync/atomic" 6) 7 8type iStorage struct { 9 storage.Storage 10 read uint64 11 write uint64 12} 13 14func (c *iStorage) Open(fd storage.FileDesc) (storage.Reader, error) { 15 r, err := c.Storage.Open(fd) 16 return &iStorageReader{r, c}, err 17} 18 19func (c *iStorage) Create(fd storage.FileDesc) (storage.Writer, error) { 20 w, err := c.Storage.Create(fd) 21 return &iStorageWriter{w, c}, err 22} 23 24func (c *iStorage) reads() uint64 { 25 return atomic.LoadUint64(&c.read) 26} 27 28func (c *iStorage) writes() uint64 { 29 return atomic.LoadUint64(&c.write) 30} 31 32// newIStorage returns the given storage wrapped by iStorage. 33func newIStorage(s storage.Storage) *iStorage { 34 return &iStorage{s, 0, 0} 35} 36 37type iStorageReader struct { 38 storage.Reader 39 c *iStorage 40} 41 42func (r *iStorageReader) Read(p []byte) (n int, err error) { 43 n, err = r.Reader.Read(p) 44 atomic.AddUint64(&r.c.read, uint64(n)) 45 return n, err 46} 47 48func (r *iStorageReader) ReadAt(p []byte, off int64) (n int, err error) { 49 n, err = r.Reader.ReadAt(p, off) 50 atomic.AddUint64(&r.c.read, uint64(n)) 51 return n, err 52} 53 54type iStorageWriter struct { 55 storage.Writer 56 c *iStorage 57} 58 59func (w *iStorageWriter) Write(p []byte) (n int, err error) { 60 n, err = w.Writer.Write(p) 61 atomic.AddUint64(&w.c.write, uint64(n)) 62 return n, err 63} 64