前言继上一篇《ReactNativeDApp开发全栈实战·从0到1系列(流动性挖矿-合约部分)》,本文进入“前端交互”环节:把Hardhat测试脚本里那套「mint→approve→deposit→evm_increaseTime→harvest」的自动化流程,
继上一篇《React Native DApp 开发全栈实战·从 0 到 1 系列(流动性挖矿-合约部分)》,本文进入“前端交互”环节:把 Hardhat 测试脚本里那套「mint → approve → deposit → evm_increaseTime → harvest」的自动化流程,
原封不动地搬到浏览器/移动端,并通过 MetaMask 实现「真钱包、真签名、真 Gas」的交互体验。
同时,我们还会解决 Web3Provider 无法时间快进、授权额度不足、奖励误差等 3 个常见踩坑点,让你真正做到「开发时秒级验证,上线后零改动」。前置准备
- hardhat启动网络节点:npx hardhat node
- hardhat启动网络节点:npx hardhat node
- 合约编译:npx hardhat compile 生成对应的xxx.json用获取abi等相关信息
- 合约部署:npx hardhat deploy --tags token,token1,LiquidityMiningVault 获取合约地址(奖励代币、质押代币和流动性挖矿的合约地址)
- 节点的私钥导入钱包:用来与合约交互时支付对应的gas费
const url = 'http://localhost:8545'; // 以 Hardhat 启动日志为准
const raw = new ethers.providers.JsonRpcProvider(url);
const id = await raw.send('eth_chainId', []);
console.log('chainId', parseInt(id, 16));
await raw.send('evm_increaseTime', [10]);
await raw.send('evm_mine');
console.log('✅ 直连成功');
说明:把测试操作集中在一个函数中
详细步骤:
allowance
,杜绝「额度不足」导致的 deposit 失败。JsonRpcProvider
直连接口,调用 evm_increaseTime
+ evm_mine
;Web3Provider
无此 API。deposit(0)
)让合约重新计算 earned
。console.log
并 .wait()
回执,开发阶段一眼定位失败点;上线前把 try/catch
细化到业务层即可直接复用。
import { abi as LiquidityMiningVaultABI } from "@/abi/LiquidityMiningVault.json";
import { abi as StakeTokenABI } from "@/abi/MyToken.json";
import { abi as REWARDTokenABI } from "@/abi/MyToken1.json"; //代币
import * as ethers from 'ethers';
const withdrawToken = async () => {
try {
const provider = new ethers.providers.Web3Provider(window.ethereum);
/ 0. 连接 MetaMask 并确保 Alice 在账户列表里 / await provider.send('eth_requestAccounts', []); const ALICE_ADDR = '0x70997970C51812dc3A010C7d01b50e0d17dc79C8'; const VAULT_ADDR = '0x1613beB3B2C4f22Ee086B2b38C1476A3cE7f78E8'; const STAKE_ADDR = '0x5FbDB2315678afecb367f032d93F642f64180aa3'; const REWARD_ADDR = '0xa513E6E4b8f2a923D98304ec87F64353C4D5C853';//奖励币
let accounts = await provider.listAccounts(); if (!accounts.map(a => a.toLowerCase()).includes(ALICE_ADDR.toLowerCase())) { await window.ethereum.request({ method: 'wallet_requestPermissions', params: [{ eth_accounts: {} }] }); accounts = await provider.send('eth_requestAccounts', []); }
const aliceIndex = accounts.findIndex( a => a.toLowerCase() === ALICE_ADDR.toLowerCase() ); if (aliceIndex === -1) throw new Error('MetaMask 中未找到 Alice 地址'); const aliceSigner = provider.getSigner(aliceIndex); const ownerSigner = provider.getSigner(0);
const DEPOSIT = ethers.utils.parseEther('1000'); const SPEED = ethers.utils.parseEther('10');
const stakeToken = new ethers.Contract(STAKE_ADDR, StakeTokenABI, ownerSigner); const rewardToken = new ethers.Contract(REWARD_ADDR, REWARDTokenABI, ownerSigner); const vault = new ethers.Contract(VAULT_ADDR, LiquidityMiningVaultABI, ownerSigner);
/ 1. vault 预充奖励 / console.log('1. vault 预充奖励'); try{ await (await rewardToken.mint(VAULT_ADDR, ethers.utils.parseEther('2000'))).wait(); }catch(err){ console.error('❌ 预充奖励失败', err); }
/ 2. 给 alice 发币 / console.log('2. alice mint'); await (await stakeToken.mint(ALICE_ADDR, DEPOSIT)).wait();
/ 3. alice 授权 —— 用 alice 自己的签名器 / console.log('3. alice 授权'); const stakeForAlice = stakeToken.connect(aliceSigner); const approveTx = await stakeForAlice.approve(VAULT_ADDR, DEPOSIT); const approveRcpt = await approveTx.wait(); console.log('approve receipt status:', approveRcpt.status);
/ 4. 再读一次授权,确认额度足够 / const allowance = await stakeToken.allowance(ALICE_ADDR, VAULT_ADDR); console.log('allowance (枚)', ethers.utils.formatEther(allowance)); if (!allowance.gte(DEPOSIT)) throw new Error('授权额仍不足');
/ 5. alice 质押 / console.log('4. alice deposit'); try{ await (await vault.connect(aliceSigner).deposit(DEPOSIT, ALICE_ADDR)).wait(); }catch(err){ console.error('❌ 质押失败', err); } / 6. owner 设奖励速度 / console.log('5. 设奖励速度'); await (await vault.connect(ownerSigner).setRewardPerSecond(SPEED)).wait();
/ 7. 时间快进 / console.log('6. evm+100s'); try{ const url = 'http://localhost:8545'; // 以 Hardhat 启动日志为准 const raw = new ethers.providers.JsonRpcProvider(url); const id = await raw.send('eth_chainId', []); console.log('chainId', parseInt(id, 16));
await raw.send('evm_increaseTime', [10]);
await raw.send('evm_mine');
console.log('✅ 直连成功');
}catch(err){ console.error('❌ 时间快进失败', err); } / 8. 触发更新 / console.log('7. 再存 0 触发更新'); await (await vault.connect(aliceSigner).deposit(0, ALICE_ADDR)).wait();
/ 9. 查询收益 / const earned = await vault.earned(ALICE_ADDR); console.log('earned(枚)', ethers.utils.formatEther(earned)); // 10. 提取奖励 console.log('8. 提取奖励'); try{ await (await vault.connect(aliceSigner).harvest()).wait(); }catch(err){ console.error('❌ 提取奖励失败', err); } console.log('9. 提取奖励后查询余额'); const balance = await rewardToken.balanceOf(ALICE_ADDR); console.log('balance(枚)', ethers.utils.formatEther(balance)); } catch (err) { console.error('❌ 流程中断', err.message ?? err); } };
# 效果图
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npx hardhat node
本地链 + 合约地址 + 节点私钥导入钱包,即可完成「开发 ⇄ 钱包」的双向通信。time.increase()
,但可以通过直连 JsonRpcProvider
调用 evm_increaseTime
与 evm_mine
,在 UI 上实现「一键跳 100 秒」的测试快感。deposit(0)
触发 updateReward
,能把区块时间误差压到 1 s 以内,肉眼可见「earned ≈ 1000 枚」。window.ethereum
换成 @walletconnect/web3wallet
或 WalletConnectModal
,即可原地切换主网、测试网或移动端钱包,真正做到「开发即生产」。至此,「合约开发 → 单元测试 → 前端交互」完整链路已跑通。
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