web3dart估算煤气费例外情况

Question

我试图估计ERC20令牌交易的天然气费--在这种情况下，把DAI从一个地址转移到另一个地址(在孟买)。

估计煤气费的代码：

final contract = DeployedContract(ContractAbi.fromJson(abi, token.id),  // 'dai'
          EthereumAddress.fromHex(token.contractAddress)); // 0xcB1e72786A6eb3b44C2a2429e317c8a2462CFeb1

final transferFunction = contract.function('transferFrom');

final transaction = Transaction.callContract(
  contract: contract,
  function: transferFunction,
  parameters: [
    EthereumAddress.fromHex(address),  // 0x2970C7181450B6c13071131f0005ccA18436c12B
    EthereumAddress.fromHex(recipientAddress),  // 0xc7c6BAEA62Ff6BBAca799156CC4e9f50BC9e8060
    10000000000000,  // 0.001 Dai
  ],
);

final fee = await _client.estimateGas(
  to: transaction.to,
  value: transaction.value,
  data: transaction.data,
);

然而，我得到了RPCError: got code 3 with msg "execution reverted: Dai/insufficient-allowance"。发件人地址持有足够的令牌(大约。0.0038戴)。我首先尝试用相同的数量调用approve，但是我得到了一个不同的例外，RPCError: got code -32000 with msg "already known".，气体估计仍然失败。

关于如何用web3dart进行正确估计的一些想法

Answer 1

尝试将发件人添加到estimateGas函数中，

  final fee = await _client.estimateGas(
      sender: EthereumAddress.fromHex(fromAddress),
      to: transaction.to,
      value: transaction.value,
      data: transaction.data,
    );