@lodestar/beacon-node
Version:
A Typescript implementation of the beacon chain
58 lines • 3.35 kB
JavaScript
import { routes } from "@lodestar/api";
import { ATTESTATION_SUBNET_COUNT } from "@lodestar/params";
import { computeSlotsSinceEpochStart } from "@lodestar/state-transition";
import { ProducedBlockSource } from "@lodestar/types";
import { MAX_BUILDER_BOOST_FACTOR } from "@lodestar/validator";
import { BuilderBlockSelectionReason, EngineBlockSelectionReason } from "./index.js";
export function computeSubnetForCommitteesAtSlot(slot, committeesAtSlot, committeeIndex) {
const slotsSinceEpochStart = computeSlotsSinceEpochStart(slot);
const committeesSinceEpochStart = committeesAtSlot * slotsSinceEpochStart;
return (committeesSinceEpochStart + committeeIndex) % ATTESTATION_SUBNET_COUNT;
}
/**
* Precompute all pubkeys for given `validatorIndices`. Ensures that all `validatorIndices` are known
* before doing other expensive logic.
*
* Uses special BranchNodeStruct state.validators data structure to optimize getting pubkeys.
* Type-unsafe: assumes state.validators[i] is of BranchNodeStruct type.
* Note: This is the fastest way of getting compressed pubkeys.
* See benchmark -> packages/beacon-node/test/perf/api/impl/validator/attester.test.ts
*/
export function getPubkeysForIndices(state, indexes) {
const validatorsLen = state.validatorCount; // Get once, it's expensive
const pubkeys = [];
for (let i = 0, len = indexes.length; i < len; i++) {
const index = indexes[i];
if (index >= validatorsLen) {
throw Error(`validatorIndex ${index} too high. Current validator count ${validatorsLen}`);
}
// NOTE: This could be optimized further by traversing the tree optimally with .getNodes()
const validator = state.getValidator(index);
pubkeys.push(validator.pubkey);
}
return pubkeys;
}
export function selectBlockProductionSource({ builderSelection, engineExecutionPayloadValue, builderExecutionPayloadValue, builderBoostFactor, }) {
switch (builderSelection) {
case routes.validator.BuilderSelection.ExecutionAlways:
case routes.validator.BuilderSelection.ExecutionOnly:
return { source: ProducedBlockSource.engine, reason: EngineBlockSelectionReason.EnginePreferred };
case routes.validator.BuilderSelection.Default:
case routes.validator.BuilderSelection.MaxProfit: {
if (builderBoostFactor === BigInt(0)) {
return { source: ProducedBlockSource.engine, reason: EngineBlockSelectionReason.EnginePreferred };
}
if (builderBoostFactor === MAX_BUILDER_BOOST_FACTOR) {
return { source: ProducedBlockSource.builder, reason: BuilderBlockSelectionReason.BuilderPreferred };
}
if (engineExecutionPayloadValue >= (builderExecutionPayloadValue * builderBoostFactor) / BigInt(100)) {
return { source: ProducedBlockSource.engine, reason: EngineBlockSelectionReason.BlockValue };
}
return { source: ProducedBlockSource.builder, reason: BuilderBlockSelectionReason.BlockValue };
}
case routes.validator.BuilderSelection.BuilderAlways:
case routes.validator.BuilderSelection.BuilderOnly:
return { source: ProducedBlockSource.builder, reason: BuilderBlockSelectionReason.BuilderPreferred };
}
}
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