@savid/rlpx-pest/dist/eth66.js

Get the [status](https://github.com/ethereum/devp2p/blob/master/caps/eth.md#status-0x00) of a [RLPx](https://github.com/ethereum/devp2p/blob/master/rlpx.md) peer via the [eth/66](https://eips.ethereum.org/EIPS/eip-2481) protocol.

import { strict as assert } from 'node:assert';
import { arrToBufArr, bufferToBigInt } from '@ethereumjs/util';
import RLP from 'rlp';
export default (callback) => ({
    name: 'eth',
    version: 66,
    length: 17,
    constructor: class EthProtocol {
        handleMessage(code, message) {
            if (code !== 0x00) {
                callback(new Error(`invalid code: ${code}`));
                return;
            }
            try {
                const payload = arrToBufArr(RLP.decode(Uint8Array.from(message)));
                assert.equal(payload.length, 6);
                assert.equal(payload[5].length, 2);
                callback(undefined, {
                    networkId: bufferToBigInt(payload[1]),
                    td: bufferToBigInt(payload[2]),
                    bestHash: `0x${payload[3].toString('hex')}`,
                    genesisHash: `0x${payload[4].toString('hex')}`,
                    fork: {
                        hash: `0x${payload[5][0].toString('hex')}`,
                        next: `0x${payload[5][1].toString('hex') || '00'}`,
                    },
                });
            }
            catch (err) {
                callback(new Error(`failed to decode RLP: ${err}`));
            }
        }
    },
});
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