service

type ChainReader interface {
	// interface to read transactions
	LoadBlockInfoByTxHash(crypto.HashType) (*types.Block, *types.Transaction, error)
	ReadBlockFromDB(*crypto.HashType) (*types.Block, int, error)
	GetEvmByHeight(msg types.Message, height uint32) (*vm.EVM, func() error, error)
	GetLogs(from, to uint32, topicslist [][][]byte) ([]*types.Log, error)
	FilterLogs(logs []*types.Log, topicslist [][][]byte) ([]*types.Log, error)

	//
	GetDataFromDB([]byte) ([]byte, error)
	GetTxReceipt(*crypto.HashType) (*types.Receipt, error)

	//interface to reader block status
	GetBlockHeight() uint32
	GetBlockHash(uint32) (*crypto.HashType, error)
	EternalBlock() *types.Block
	TailBlock() *types.Block
	TailState() *state.StateDB
}

type Server interface {
	// Run a server
	Run() error
	// Stop the service. It is blocked unitl the server is down.
	Stop()

	// Proc returns the goprocess of server is running
	Proc() goprocess.Process
}

type TxHandler interface {
	ProcessTx(*types.Transaction, core.TransferMode) error
	GetTxByHash(hash *crypto.HashType) (*types.TxWrap, bool)
}

type WalletAgent interface {
	Balance(addr string, tid *types.TokenID) (uint64, error)
	Utxos(addr string, tid *types.TokenID, amount uint64) ([]*rpcpb.Utxo, error)
}