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packages/lodestar/src/chain/precomputeNextEpochTransition.ts
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,130 @@ | ||
| import {computeEpochAtSlot, isBellatrixStateType} from "@chainsafe/lodestar-beacon-state-transition"; | ||
| import {IChainForkConfig} from "@chainsafe/lodestar-config"; | ||
| import {ForkSeq, SLOTS_PER_EPOCH} from "@chainsafe/lodestar-params"; | ||
| import {Slot} from "@chainsafe/lodestar-types"; | ||
| import {ILogger, sleep} from "@chainsafe/lodestar-utils"; | ||
| import {GENESIS_EPOCH, ZERO_HASH_HEX} from "../constants/constants.js"; | ||
| import {IMetrics} from "../metrics/index.js"; | ||
| import {ChainEvent} from "./emitter.js"; | ||
| import {prepareExecutionPayload} from "./factory/block/body.js"; | ||
| import {IBeaconChain} from "./interface.js"; | ||
| import {RegenCaller} from "./regen/index.js"; | ||
|
|
||
| /* With 12s slot times, this scheduler will run 4s before the start of each slot (`12 / 3 = 4`). */ | ||
| const SCHEDULER_LOOKAHEAD_FACTOR = 3; | ||
|
|
||
| /* We don't want to do more epoch transition than this */ | ||
| const PREPARE_EPOCH_LIMIT = 1; | ||
|
|
||
| /** | ||
| * At Bellatrix, if we are responsible for proposing in next slot, we want to prepare payload | ||
| * 4s (1/3 slot) before the start of next slot | ||
| * | ||
| * For all forks, when clock is 1/3 slot before an epoch, we want to prepare for the next epoch | ||
| * transition from our head so that: | ||
| * + validators vote for block head on time through attestation | ||
| * + validators propose blocks on time | ||
| * + For Bellatrix, to compute proposers of next epoch so that we can prepare new payloads | ||
| * | ||
| */ | ||
| export class PrepareNextSlotScheduler { | ||
| constructor( | ||
| private readonly chain: IBeaconChain, | ||
| private readonly config: IChainForkConfig, | ||
| private readonly metrics: IMetrics | null, | ||
| private readonly logger: ILogger, | ||
| private readonly signal: AbortSignal | ||
| ) { | ||
| this.chain.emitter.on(ChainEvent.clockSlot, this.prepareForNextSlot); | ||
|
|
||
| this.signal.addEventListener( | ||
| "abort", | ||
| () => { | ||
| this.chain.emitter.off(ChainEvent.clockSlot, this.prepareForNextSlot); | ||
| }, | ||
| {once: true} | ||
| ); | ||
| } | ||
|
|
||
| /** | ||
| * Use clockSlot instead of clockEpoch to schedule the task at more exact time. | ||
| */ | ||
| prepareForNextSlot = async (clockSlot: Slot): Promise<void> => { | ||
| const prepareSlot = clockSlot + 1; | ||
| const prepareEpoch = computeEpochAtSlot(prepareSlot); | ||
| const isLastEpochSlot = (clockSlot + 1) % SLOTS_PER_EPOCH === 0; | ||
| if (this.config.getForkSeq(prepareEpoch) < ForkSeq.bellatrix && !isLastEpochSlot) { | ||
| return; | ||
| } | ||
|
|
||
| const slotMs = this.config.SECONDS_PER_SLOT * 1000; | ||
| // At 1/3 slot time before the next slot, we either prepare payload or precompute epoch transition | ||
| await sleep(slotMs - slotMs / SCHEDULER_LOOKAHEAD_FACTOR, this.signal); | ||
|
|
||
| // calling updateHead() here before we produce a block to reduce reorg possibility | ||
| const {slot: headSlot, blockRoot: headRoot} = this.chain.forkChoice.updateHead(); | ||
| const nextEpoch = computeEpochAtSlot(clockSlot) + 1; | ||
| // Do nothing at pre genesis | ||
| if (nextEpoch <= GENESIS_EPOCH) return; | ||
|
|
||
| const headEpoch = computeEpochAtSlot(headSlot); | ||
| if (prepareEpoch - headEpoch > PREPARE_EPOCH_LIMIT) { | ||
| this.metrics?.precomputeNextEpochTransition.count.inc({result: "skip"}, 1); | ||
| this.logger.debug("Skipping PrepareNextSlotScheduler - head slot is too behind current slot", { | ||
| nextEpoch, | ||
| headSlot, | ||
| clockSlot, | ||
| }); | ||
|
|
||
| return; | ||
| } | ||
|
|
||
| if (prepareEpoch > headEpoch) { | ||
| this.logger.verbose("Running PrepareNextSlotScheduler epoch transition", {nextEpoch, headSlot, prepareSlot}); | ||
| } | ||
|
|
||
| // No need to wait for this or the clock drift | ||
| // Pre Bellatrix: we only do precompute state transition for the last slot of epoch | ||
| // For Bellatrix, we always do the `processSlots()` to prepare payload for the next slot | ||
| this.chain.regen | ||
| .getBlockSlotState(headRoot, prepareSlot, RegenCaller.precomputeEpoch) | ||
| .then((prepareState) => { | ||
| // assuming there is no reorg, it caches the checkpoint state & helps avoid doing a full state transition in the next slot | ||
| // + when gossip block comes, we need to validate and run state transition | ||
| // + if next slot is a skipped slot, it'd help getting target checkpoint state faster to validate attestations | ||
| if (prepareEpoch > headEpoch) { | ||
| this.metrics?.precomputeNextEpochTransition.count.inc({result: "success"}, 1); | ||
| const previousHits = this.chain.checkpointStateCache.updatePreComputedCheckpoint(headRoot, nextEpoch); | ||
| if (previousHits === 0) { | ||
| this.metrics?.precomputeNextEpochTransition.waste.inc(); | ||
| } | ||
| this.metrics?.precomputeNextEpochTransition.hits.set(previousHits ?? 0); | ||
| this.logger.verbose("Completed PrepareNextSlotScheduler epoch transition", { | ||
| nextEpoch, | ||
| headSlot, | ||
| prepareSlot, | ||
| }); | ||
| } | ||
|
|
||
| if (isBellatrixStateType(prepareState)) { | ||
| const proposerIndex = prepareState.epochCtx.getBeaconProposer(prepareSlot); | ||
| const feeRecipient = this.chain.beaconProposerCache.get(proposerIndex); | ||
| if (feeRecipient) { | ||
| const safeBlockHash = this.chain.forkChoice.getJustifiedBlock().executionPayloadBlockHash ?? ZERO_HASH_HEX; | ||
| const finalizedBlockHash = | ||
| this.chain.forkChoice.getFinalizedBlock().executionPayloadBlockHash ?? ZERO_HASH_HEX; | ||
| void prepareExecutionPayload(this.chain, safeBlockHash, finalizedBlockHash, prepareState, feeRecipient); | ||
| this.logger.verbose("PrepareNextSlotScheduler prepared new payload", { | ||
| prepareSlot, | ||
| proposerIndex, | ||
| feeRecipient, | ||
| }); | ||
| } | ||
| } | ||
| }) | ||
| .catch((e) => { | ||
| this.metrics?.precomputeNextEpochTransition.count.inc({result: "error"}, 1); | ||
| this.logger.error("Failed to precompute epoch transition", nextEpoch, e); | ||
| }); | ||
| }; | ||
| } |
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