state

type Account interface {
	// account address
	Address() *common.Address

	// account transaction nonce start from 0
	Nonce() uint64
	SetNonce(uint64)
	AddNonce(uint64)

	// account balance in minimum unit
	Balance() *big.Int
	SetBalance(*big.Int)
	AddBalance(*big.Int)
	SubBalance(*big.Int)

	// binary representation for account used as trie value
	ToBytes() ([]byte, error)
}

type AccountTrie interface {

	// Get account from trie, create if requested
	GetAccount(address common.Address, createIfMissing bool) Account
	// contains filtered or unexported methods
}

type ConsensusTrie interface {

	// Get validator address list
	GetValidatorAddr() []common.Address

	// Get / Set validator address str list
	GetValidators() []string
	SetValidators([]string)
	// contains filtered or unexported methods
}

type Database interface {
	// open trie with root hash
	OpenTrie(root common.Hash) (Trie, error)

	// copy whatever inner implementation was used
	CopyTrie(trie Trie) Trie

	// retrieves the backing trie DB
	TrieDB() *trie.Database
}

type Trie interface {
	TryGet(key []byte) ([]byte, error)
	TryUpdate(key, value []byte) error
	TryDelete(key []byte) error
	Commit(onleaf trie.LeafCallback) (common.Hash, error)
	Hash() common.Hash
	NodeIterator(startKey []byte) trie.NodeIterator
}