package geth import ( "errors" "context" "math/big" "github.com/ethereum/go-ethereum" "github.com/ethereum/go-ethereum/common" ) var ( ErrInvalidStateAttribute = errors.New("invalid state attribute") ) func (blockChain *BlockChain) FetchContractData(abiJSON string, address string, method string, methodArgs []interface{}, result interface{}, blockNumber int64) error { parsed, err := ParseAbi(abiJSON) if err != nil { return err } var input []byte if methodArgs != nil { input, err = parsed.Pack(method, methodArgs...) } else { input, err = parsed.Pack(method) } if err != nil { return err } output, err := blockChain.callContract(address, input, big.NewInt(blockNumber)) if err != nil { return err } return parsed.Unpack(result, method, output) } func (blockChain *BlockChain) callContract(contractHash string, input []byte, blockNumber *big.Int) ([]byte, error) { to := common.HexToAddress(contractHash) msg := ethereum.CallMsg{To: &to, Data: input} return blockChain.client.CallContract(context.Background(), msg, blockNumber) }