@lodestar/beacon-node/lib/chain/seenCache/seenCommittee.js

A Typescript implementation of the beacon chain

import { MapDef } from "@lodestar/utils";
/**
 * SyncCommittee signatures are only useful during a single slot according to our peer's clocks
 */
const MAX_SLOTS_IN_CACHE = 3;
/**
 * Cache seen SyncCommitteeMessage by slot + validator index.
 */
export class SeenSyncCommitteeMessages {
    constructor() {
        this.seenCacheBySlot = new MapDef(() => new Map());
    }
    /**
     * based on slot + validator index
     */
    get(slot, subnet, validatorIndex) {
        const root = this.seenCacheBySlot.getOrDefault(slot).get(seenCacheKey(subnet, validatorIndex));
        return root ?? null;
    }
    /** Register item as seen in the cache */
    add(slot, subnet, validatorIndex, root) {
        this.seenCacheBySlot.getOrDefault(slot).set(seenCacheKey(subnet, validatorIndex), root);
    }
    /** Prune per clock slot */
    prune(clockSlot) {
        for (const slot of this.seenCacheBySlot.keys()) {
            if (slot < clockSlot - MAX_SLOTS_IN_CACHE) {
                this.seenCacheBySlot.delete(slot);
            }
        }
    }
}
function seenCacheKey(subnet, validatorIndex) {
    return `${subnet}-${validatorIndex}`;
}
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