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index.js
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index.js
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#!/usr/bin/env node
const ethers = require('ethers');
const http = require('http');
require('dotenv').config();
const host = process.env.ETH_RPC_HOST || 'localhost';
const rpc_port=process.env.ETH_RPC_PORT || 8545;
const network = process.env.ETH_NETWORK || 'https://bsc-dataseed1.binance.org:443';
const local_port=process.env.ETH_MONITOR_PORT || 50000;
const max_difference=process.env.MAX_BLOCK_DIFFERENCE || 3;
const provider = new ethers.providers.JsonRpcProvider(network);
const localProvider = new ethers.providers.JsonRpcProvider(`http://${host}:`+rpc_port);
localProvider.connection.timeout = 5000;
const onHealthcheckRequest = async (req, res) => {
res.setHeader("Access-Control-Allow-Origin", "*");
res.setHeader("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");
console.log('>> checking '+host+':'+rpc_port+' ('+network+') ');
let localBlockNum;
let networkBlockNum;
try {
localBlockNum = await localProvider.getBlockNumber();
console.log('>> localBlock '+localBlockNum);
networkBlockNum = await provider.getBlockNumber();
console.log('>> networkBlock '+networkBlockNum);
} catch (e) {
console.error(e);
res.writeHead(500, { 'Content-Type': 'text/plain' });
res.end();
}
let responseStatus = networkBlockNum - localBlockNum > max_difference ? 500 : 200;
if (localBlockNum > 10000 && networkBlockNum <= 0) {
responseStatus = 200;
}
res.writeHead(responseStatus, { 'Content-Type': 'text/plain' });
res.end((localBlockNum - networkBlockNum).toString());
};
console.log('Starting eth monitoring service for '+host+':'+rpc_port+' on ' + local_port + '...');
http.createServer(onHealthcheckRequest).listen(local_port);