使用Hardhat 2.22.2主网分叉测试时遇429错误的求助

开发者阿泽

2026-6-25

Hardhat主网分叉测试429请求超限错误解决方案

遇到的错误信息：

[Error: The response reported error `429`: `Your app has exceeded its compute units per second capacity. If you have retries enabled, you can safely ignore this message. If not, check out https://docs.alchemy.com/reference/throughput`. (optional data: None). Request: [{"id":8,"jsonrpc":"2.0","method":"eth_getBalance","params":["0x90f79bf6eb2c4f870365e785982e1f101e93b906","0x12bb9c5"]},{"id":9,"jsonrpc":"2.0","method":"eth_getTransactionCount","params":["0x90f79bf6eb2c4f870365e785982e1f101e93b906","0x12bb9c5"]},{"id":10,"jsonrpc":"2.0","method":"eth_getCode","params":["0x90f79bf6eb2c4f870365e785982e1f101e93b906","0x12bb9c5"]}]] {
  code: 'GenericFailure'
}

这个错误是因为Alchemy的API请求超出了每秒计算单元（CU）的限流阈值，重试后恢复是因为限流会在短时间内自动解除。以下是几种解决办法：

开启Hardhat自动重试
在hardhat.config.js的forking配置中添加重试参数，让Hardhat自动处理超限请求：

module.exports = {
  networks: {
    hardhat: {
      forking: {
        url: "你的Alchemy RPC地址",
        timeout: 10000,
        retries: 3, // 重试次数
        retryInterval: 1000 // 每次重试间隔（毫秒）
      }
    }
  }
};

优化请求频率
减少批量请求的数量，或者在测试代码中添加延迟，避免短时间内发送大量请求。比如在测试步骤之间插入：
```
await new Promise(resolve => setTimeout(resolve, 500));
```

缓存重复请求数据
对于测试中重复查询的地址余额、合约代码等数据，在本地缓存结果，避免重复调用RPC接口。比如用对象存储缓存：

const balanceCache = {};
async function getCachedBalance(address, blockNumber) {
  const key = `${address}-${blockNumber}`;
  if (!balanceCache[key]) {
    balanceCache[key] = await ethers.provider.getBalance(address, blockNumber);
  }
  return balanceCache[key];
}