database

type Database interface {
	PreimageStore

	// Reader returns a node reader associated with the specific state.
	// An error will be returned if the specified state is not available.
	Reader(stateRoot common.Hash) (Reader, error)
}

type PreimageStore interface {
	// Preimage retrieves the preimage of the specified hash.
	Preimage(hash common.Hash) []byte

	// InsertPreimage commits a set of preimages along with their hashes.
	InsertPreimage(preimages map[common.Hash][]byte)
}

type Reader interface {
	// Node retrieves the trie node blob with the provided trie identifier,
	// node path and the corresponding node hash. No error will be returned
	// if the node is not found.
	Node(owner common.Hash, path []byte, hash common.Hash) ([]byte, error)
}