@lodestar/beacon-node/lib/network/discv5/utils.js

A Typescript implementation of the beacon chain

import { ENRKey } from "../metadata.js";
export { ENRRelevance };
var ENRRelevance;
(function (ENRRelevance) {
    ENRRelevance["no_transport"] = "no_transport";
    ENRRelevance["no_eth2"] = "no_eth2";
    // biome-ignore lint/style/useNamingConvention: Need to use the this name for network convention
    ENRRelevance["unknown_forkDigest"] = "unknown_forkDigest";
    ENRRelevance["current_fork_mismatch"] = "current_fork_mismatch";
    ENRRelevance["relevant"] = "relevant";
})(ENRRelevance || (ENRRelevance = {}));
export function enrRelevance(enr, config, clock) {
    // We are not interested in peers that don't advertise at least one transport (tcp or quic)
    const multiaddrTCP = enr.getLocationMultiaddr(ENRKey.tcp);
    const multiaddrQUIC = enr.getLocationMultiaddr(ENRKey.quic);
    if (!multiaddrTCP && !multiaddrQUIC) {
        return ENRRelevance.no_transport;
    }
    // Check if the ENR.eth2 field matches and is of interest
    const eth2 = enr.kvs.get(ENRKey.eth2);
    if (!eth2) {
        return ENRRelevance.no_eth2;
    }
    // Fast de-serialization without SSZ
    const forkDigest = eth2.slice(0, 4);
    // Check if forkDigest matches any of our known forks.
    const { fork: forkName } = config.forkDigest2ForkBoundaryOption(forkDigest) ?? {};
    if (forkName === undefined) {
        return ENRRelevance.unknown_forkDigest;
    }
    // Check if fork digest's fork matches ours
    const currentSlot = clock.slotWithFutureTolerance(config.MAXIMUM_GOSSIP_CLOCK_DISPARITY / 1000);
    const localForkInfo = config.getForkInfo(currentSlot);
    // We only connect if the ENR's fork matches our current fork.
    // We also allow it to be the previous fork due to delay and infrequent update of DHT.
    if (forkName !== localForkInfo.name && forkName !== localForkInfo.prevForkName) {
        return ENRRelevance.current_fork_mismatch;
    }
    // TODO: If we have next fork scheduled, check if next fork info matches ours
    // const enrForkId = ssz.phase0.ENRForkID.deserialize(eth2);
    return ENRRelevance.relevant;
}
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