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我试图通过调用Kyber 交换合约.estimateGas()的功能来估算 gas。trade

    async getGas(inputToken: TokenInfo, outputToken: TokenInfo, walletAddress: string, amountInWei = Utils.toWei(1), minRate: BN) {
        if (amountInWei.lt(toBN(1000))) throw `{${this.name}}.getGas(): The amount ${amountInWei} must be >= 1000.`;

        var contract = this.getContract();
        let ethValue = inputToken.isETH ? amountInWei: Utils.ZERO_BN;
        var tx: ContractSendMethod = contract.methods.trade(inputToken.contractAddress, amountInWei, outputToken.contractAddress, walletAddress, MAX_ALLOWANCE, minRate, Utils.ZERO_ADDRESS); //Utils.getWalletAddress()
        
        debugger;
        var gas = await tx.estimateGas({ from: walletAddress, gas: 10000000000, value: ethValue }); // FAILS HERE
        debugger;
        return toBN(gas);
    }

我试过estimateGas()不带参数和带（如上所示）。然后我在文档中发现您可能必须先调用approveERC20 合约，所以我也这样做了（取自文档并修改为适合）：

async checkAndApproveTokenForTrade(srcToken: TokenInfo, userAddress: string, srcQty: BN) {
        if (!srcToken.abi || srcToken.contractAddress == Tokens.ETH.contractAddress)
            return;
        
        // check existing allowance given to proxy contract
        var srcTokenContract = srcToken.contract;
        let existingAllowance = toBN(await srcTokenContract.methods.allowance(userAddress, KyberExchange.KYBER_RATE_ADDRESS/*IKyberNetworkProxy_ADDRESS*/).call());

        // if zero allowance, just set to MAX_UINT256
        if (existingAllowance.eq(Utils.ZERO_BN)) {
            console.log("Approving KNP contract to max allowance.");
            var result = await srcTokenContract.methods.approve(KyberExchange.KYBER_RATE_ADDRESS, srcQty).call();
        } else if (existingAllowance.lt(srcQty)) {
            // if existing allowance is insufficient, reset to zero, then set to MAX_UINT256
            console.log("Approving KNP contract to zero, then max allowance.");
            result = await srcTokenContract.methods.approve(KyberExchange.KYBER_RATE_ADDRESS, Utils.ZERO_BN).call();
            result = await srcTokenContract.methods.approve(KyberExchange.KYBER_RATE_ADDRESS, srcQty).call();
        }
    }

    async getGas(inputToken: TokenInfo, outputToken: TokenInfo, walletAddress: string, amountInWei = Utils.toWei(1), minRate: BN) {
        if (amountInWei.lt(toBN(1000))) throw `{${this.name}}.getGas(): The amount ${amountInWei} must be >= 1000.`;

        await this.checkAndApproveTokenForTrade(inputToken, walletAddress, amountInWei);

        var contract = this.getContract();
        let ethValue = inputToken.isETH ? amountInWei: Utils.ZERO_BN;
        var tx: ContractSendMethod = contract.methods.trade(inputToken.contractAddress, amountInWei, outputToken.contractAddress, walletAddress, MAX_ALLOWANCE, minRate, Utils.ZERO_ADDRESS); //Utils.getWalletAddress()
        var gas = await tx.estimateGas({ from: walletAddress, gas: 10000000000, value: ethValue }); // STILL FAILS
        return toBN(gas);
    }

这些是执行时的事务参数： 在此处输入图像描述

  • 1 - BN = "34950159783737063"
  • 5 - BN = "2762660877769768"

我不断收到“返回错误：所需气体超过限额 (123965250) 或交易总是失败。”。我已经没有办法解决这个问题了。我希望该错误能够更准确地描述问题所在。我认为函数本身很可能会引发错误，但不知道是什么或为什么。我可以调用交换合约来获取汇率，所以系统的其余部分都在工作，而不是估计气体的部分。

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