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