@lodestar/beacon-node/lib/network/processor/aggregatorTracker.js

A Typescript implementation of the beacon chain

import { SLOTS_PER_EPOCH } from "@lodestar/params";
import { MapDef, pruneSetToMax } from "@lodestar/utils";
// Subscriptions are submitted max two epochs in advance
const MAX_SLOTS_CACHED = SLOTS_PER_EPOCH * 2;
/**
 * Track if there's at least one aggregator on tuple (subnet, slot),
 * to only then insert attestations into the op pool
 */
export class AggregatorTracker {
    constructor() {
        this.subnetAggregatorsBySlot = new MapDef(() => new Set());
    }
    get maxSlotsCached() {
        return MAX_SLOTS_CACHED;
    }
    addAggregator(subnet, slot) {
        this.subnetAggregatorsBySlot.getOrDefault(slot).add(subnet);
    }
    shouldAggregate(subnet, slot) {
        return this.subnetAggregatorsBySlot.get(slot)?.has(subnet) === true;
    }
    prune() {
        // We could also `pruneBySlot` as items before current slot are no longer
        // relevant but due to small cache size (64), the best approach is to
        // just prune the cache after a batch of subnet subscriptions is processed.
        pruneSetToMax(this.subnetAggregatorsBySlot, MAX_SLOTS_CACHED, 
        // Prune the oldest slots first
        (a, b) => a - b);
    }
}
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