ccip-read.js

const MAX_FAIL = parseInt(args[0], 16);

const chainMapping = {
    '11155111': [
        `https://sepolia.infura.io/v3/${secrets.INFURA_API_KEY}`,
        `https://rpc.sepolia.org`,

    ],
    '10': [
        `https://mainnet.optimism.io`,
        `https://optimism-mainnet.infura.io/v3/${secrets.INFURA_API_KEY}`,
    ],
    '80001': [
        `https://polygon-mumbai.infura.io/${secrets.INFURA_API_KEY}`
    ]
};

let responses = [];
for (let i = 1;i < args.length;i += 3) {
    const chainId = parseInt(args[i], 16);
    const callTo = args[i + 1]
    const callHex = args[i + 2];
    const urls = chainMapping[chainId];
    const params = { jsonrpc: '2.0', id: 1, method: 'eth_call', params: [{ to: callTo, data: callHex }, 'latest'] };
    const results = (await Promise.allSettled(
        urls.map(url => Functions.makeHttpRequest({ url, method: 'POST', data: params }))
    )).map(r => r.value);
    let ress = [];
    for (const [i, result] of results.entries()) {
        if (!result.data) {
            console.log(`error on ${chainId}, API endpoint idx ${i}`, result.toString());
        } else {
            ress.push(result.data.result);
        }
    }

    if (urls.length - ress.length > MAX_FAIL) {
        throw new Error('exceeded failure threshold');
    }

    ress.sort();
    responses.push(ress[Math.floor(ress.length / 2)].slice(2));
}

return Buffer.from(responses.join(''), 'hex');