如何从草帽的主干网分叉中获取Uniswap数据？

Question

我正在使用Uniswap从Uniswap池中获取ETH的价格，使用的是Hardhat的主网分叉，但查询返回的是ETH的当前价格，而不是几个月前的挂起块。

如何从阿拉伯茶的主网叉中获取Uniswap池信息？如果不可能使用Uniswap，有什么解决办法吗？

提前感谢！

Answer 1

经过一些搜索后，我不认为Uniswap可以连接到本地的mainnet分叉。然而，一个很好的解决办法是直接从Uniswap合同调用方法。

例如，这将从一个固定的块中获取ETH的正确价格：

const UNISWAPV2_ROUTER02_ADDRESS = "0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D";
const UNISWAPV2_ROUTER02_ABI = [{ "inputs": [{ "internalType": "uint256", "name": "amountIn", "type": "uint256" }, { "internalType": "address[]", "name": "path", "type": "address[]" }], "name": "getAmountsOut", "outputs": [{ "internalType": "uint256[]", "name": "amounts", "type": "uint256[]" }], "stateMutability": "view", "type": "function" }]

const DAI_ADDRESS = "0x6b175474e89094c44da98b954eedeac495271d0f";
const WETH_ADDRESS = "0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2";

const uniswap = new ethers.Contract(
    UNISWAPV2_ROUTER02_ADDRESS,
    UNISWAPV2_ROUTER02_ABI,
    ethers.provider,
);

let amountEthFromContract = await uniswap.getAmountsOut(
    1, // 1 ETH
    [WETH_ADDRESS, DAI_ADDRESS]
)

console.log(`1 Eth = ${amountEthFromContract[1].toString()} USD`)

Answer 2

https://github.com/defi-wonderland/solidity-boilerplate/blob/main/test/utils/uniswap.ts

代码在这里

import UniswapV2FactoryContract from '@uniswap/v2-core/build/UniswapV2Factory.json';
import UniswapV2Router02Contract from '@uniswap/v2-periphery/build/UniswapV2Router02.json';
import IUniswapV2Pair from '@uniswap/v2-core/build/IUniswapV2Pair.json';
import WETHContract from '@uniswap/v2-periphery/build/WETH9.json';
import { deployContract } from 'ethereum-waffle';

uniswapV2Factory = await deployContract(owner, UniswapV2FactoryContract, [await owner.getAddress()]);
uniswapV2Router02 = await deployContract(owner, UniswapV2Router02Contract, [uniswapV2Factory.address, WETH.address], { gasLimit: 9500000 });