core

type Directory interface {
	Get(id uint64) (n *Needle, err error)
	New(n *Needle) (err error)
	Has(id uint64) (has bool)
	Del(id uint64) (err error)
	Set(id uint64, n *Needle) (err error)
	Iter() (iter Iterator)
}

type Iterator interface {
	Next() (key []byte, exists bool)
	Release()
}

type LeveldbDirectory struct {
	// contains filtered or unexported fields
}

type LeveldbIterator struct {
	// contains filtered or unexported fields
}

type Needle struct {
	ID       uint64 // 唯一ID， 64
	Size     uint64 // size of BODY
	Offset   uint64 // points to start of header
	File     *os.File
	FileExt  string // 文件扩展名, 下载时用来判断 content-type
	Checksum uint32

	CreatedAt time.Time
	UpdatedAt time.Time
	// contains filtered or unexported fields
}

type Volume struct {
	ID            uint64
	File          *os.File
	Directory     Directory
	Size          uint64
	Path          string
	CurrentOffset uint64 // 从文件中恢复的时候， 第一个byte就是currentoffset. 每次写入文件也要更新此offset。
	// contains filtered or unexported fields
}