db

type Commit interface {
	Identifier() types.HashHeight
	Previous() types.HashHeight
	Serialize() ([]byte, error)
}

type DB interface {
	Get([]byte) ([]byte, error)
	Has([]byte) (bool, error)
	Put(key, value []byte) error
	Delete(key []byte) error

	NewIterator(prefix []byte) StorageIterator
	Subset(prefix []byte) DB

	Apply(Patch) error
	Changes() (Patch, error)
	Snapshot() DB
}

type LevelDBLike interface {
	LevelDBLikeRO
	Put(key []byte, value []byte, wo *opt.WriteOptions) error
}

type LevelDBLikeRO interface {
	Get(key []byte, ro *opt.ReadOptions) (value []byte, err error)
	Has(key []byte, ro *opt.ReadOptions) (ret bool, err error)
	NewIterator(slice *util.Range, ro *opt.ReadOptions) iterator.Iterator
}

type Manager interface {
	Frontier() DB
	Get(types.HashHeight) DB
	GetPatch(identifier types.HashHeight) Patch

	Add(Transaction) error
	Pop() error

	Stop() error
	Location() string
}

type Patch interface {
	Put(key []byte, value []byte)
	Delete(key []byte)

	Replay(PatchReplayer) error
	Dump() []byte
}

type PatchReplayer interface {
	Put(key []byte, value []byte)
	Delete(key []byte)
}

type StorageIterator interface {
	Next() bool

	Key() []byte
	Value() []byte
	Error() error
	Release()
}

type Transaction interface {
	GetCommits() []Commit
	StealChanges() Patch
}