62 lines
1.8 KiB
Go
62 lines
1.8 KiB
Go
// VulcanizeDB
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// Copyright © 2019 Vulcanize
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package geth
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import (
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"context"
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"errors"
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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, methodArgs []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 methodArgs != nil {
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input, err = parsed.Pack(method, methodArgs...)
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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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var bn *big.Int
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if blockNumber > 0 {
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bn = big.NewInt(blockNumber)
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}
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output, err := blockChain.callContract(address, input, bn)
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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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