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index.js
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index.js
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// 引入依赖
const express = require('express');
const dotenv = require('dotenv').config();
const Web3 = require('web3');
const morgan = require('morgan');
const axios = require('axios');
// Web3配置和初始化
const web3 = new Web3(new Web3.providers.HttpProvider(process.env.INFURA_URL));
// Express应用初始化
const app = express();
// 使用Morgan进行请求日志记录
app.use(morgan('dev'));
// 解析JSON请求体
app.use(express.json());
// 简单的GET路由,返回欢迎信息
app.get('/', (req, res) => {
res.send('Welcome to the Blockchain Express Server!');
});
// GET路由,调用智能合约
app.get('/contract-data', async (req, res) => {
try {
const contractAddress = process.env.CONTRACT_ADDRESS;
const contractABI = JSON.parse(process.env.CONTRACT_ABI);
const contract = new web3.eth.Contract(contractABI, contractAddress);
const data = await contract.methods.someMethod().call(); // 假设合约中有一个someMethod方法
res.json({ success: true, data: data });
} catch (error) {
console.error('Error fetching contract data:', error);
res.status(500).json({ success: false, message: 'Error fetching contract data' });
}
});
// 错误处理中间件
app.use((err, req, res, next) => {
console.error(err.stack);
res.status(500).send('Something broke!');
});
// 服务器启动
const PORT = process.env.PORT || 3000;
app.listen(PORT, () => {
console.log(`Server is running on http://localhost:${PORT}`);
});