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

A Typescript implementation of the beacon chain

import { MapDef } from "@lodestar/utils";
/**
 * Tracks signed proposer preferences we've already seen per (dependent_root, proposal_slot, validator_index).
 */
export class SeenProposerPreferences {
    validatorByDependentRootBySlot = new MapDef(() => new Map());
    isKnown(dependentRoot, proposalSlot, validatorIndex) {
        return this.validatorByDependentRootBySlot.get(proposalSlot)?.get(dependentRoot) === validatorIndex;
    }
    add(dependentRoot, proposalSlot, validatorIndex) {
        this.validatorByDependentRootBySlot.getOrDefault(proposalSlot).set(dependentRoot, validatorIndex);
    }
    /**
     * Entries are only load-bearing while `proposal_slot > current_slot`. Once the slot has
     * passed the `[IGNORE] proposal_slot > current_slot` gossip rule takes over, so drop them
     * on each slot tick.
     */
    prune(currentSlot) {
        for (const slot of this.validatorByDependentRootBySlot.keys()) {
            if (slot < currentSlot) {
                this.validatorByDependentRootBySlot.delete(slot);
            }
        }
    }
}
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