sendBEP20Token method

@override Future<String> sendBEP20Token({ required String toAddress, required String privateKey, required double amount, })

BEP-20 토큰 전송

Implementation

@override
Future<String> sendBEP20Token({
  required String toAddress,
  required String privateKey,
  required double amount,
}) async {
  try {
    var contract = DeployedContract(
        ContractAbi.fromJson(abiJson, 'blToken'),
        EthereumAddress.fromHex(blTokenContract)
    );

    // 금액을 토큰 단위로 변환
    final amountInTokenUnit = BigInt.from(amount * pow(10, 18));

    // 자격증명 생성
    final credentials = EthPrivateKey.fromHex(privateKey);
    final from = credentials.address;

    // 토큰 잔액 확인
    final balanceFunction = contract.function('balanceOf');
    final balanceResult = await _client.call(
        contract: contract,
        function: balanceFunction,
        params: [from]
    );
    final tokenBalance = balanceResult.first as BigInt;

    if (tokenBalance < amountInTokenUnit) {
      throw Exception('Insufficient token balance');
    }

    // 가스비 계산
    final gasFee = await estimateGasFee(
        from: from.hex,
        toAddress: toAddress,
        amount: amount,
        isBEP20: true
    );

    // BNB 잔액 확인 (가스비를 위한)
    final bnbBalance = await _client.getBalance(from);
    if (bnbBalance.getInWei < gasFee['totalGasFee']!) {
      throw Exception('Insufficient BNB balance for gas');
    }

    // transfer 함수 호출
    final transferFunction = contract.function('transfer');
    final transaction = await _client.sendTransaction(
      credentials,
      Transaction.callContract(
        contract: contract,
        function: transferFunction,
        parameters: [
          EthereumAddress.fromHex(toAddress),
          amountInTokenUnit
        ],
        gasPrice: EtherAmount.fromBigInt(EtherUnit.wei, gasFee['gasPrice']!),
        maxGas: gasFee['estimatedGas']!.toInt(),
        // gasPrice: await _client.getGasPrice(),
        // maxGas: 100000, // BEP-20 전송은 일반적으로 더 많은 가스가 필요
      ),
      chainId: chainId,
    );

    return transaction;
  } catch (e) {
    throw Exception('Failed to send token: ${e.toString()}');
  }
}