@lodestar/beacon-node/lib/db/repositories/lightclientBestUpdate.js

A Typescript implementation of the beacon chain

import { Repository } from "@lodestar/db";
import { ssz } from "@lodestar/types";
import { Bucket, getBucketNameByValue } from "../buckets.js";
const SLOT_BYTE_COUNT = 8;
/**
 * Best PartialLightClientUpdate in each SyncPeriod
 *
 * Used to prepare light client updates
 */
export class BestLightClientUpdateRepository extends Repository {
    constructor(config, db) {
        // Pick some type but won't be used
        const bucket = Bucket.lightClient_bestLightClientUpdate;
        super(config, db, bucket, ssz.altair.LightClientUpdate, getBucketNameByValue(bucket));
    }
    // Overrides for multi-fork
    encodeValue(value) {
        // Not easy to have a fixed slot position for all forks in attested header, so lets
        // prefix by attestedHeader's slot bytes
        const slotBytes = ssz.Slot.serialize(value.attestedHeader.beacon.slot);
        const valueBytes = this.config
            .getPostAltairForkTypes(value.attestedHeader.beacon.slot)
            .LightClientUpdate.serialize(value);
        const prefixedData = new Uint8Array(SLOT_BYTE_COUNT + valueBytes.length);
        prefixedData.set(slotBytes, 0);
        prefixedData.set(valueBytes, SLOT_BYTE_COUNT);
        return prefixedData;
    }
    decodeValue(data) {
        // First slot is written
        const slot = ssz.Slot.deserialize(data.subarray(0, SLOT_BYTE_COUNT));
        return this.config.getPostAltairForkTypes(slot).LightClientUpdate.deserialize(data.subarray(SLOT_BYTE_COUNT));
    }
}
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