127 lines
4.9 KiB
Markdown
127 lines
4.9 KiB
Markdown
# Whisk -- Fork Logic
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**Notice**: This document is a work-in-progress for researchers and implementers.
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## Table of contents
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<!-- TOC -->
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<!-- START doctoc generated TOC please keep comment here to allow auto update -->
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<!-- DON'T EDIT THIS SECTION, INSTEAD RE-RUN doctoc TO UPDATE -->
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- [Introduction](#introduction)
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- [Configuration](#configuration)
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- [Fork to Whisk](#fork-to-whisk)
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<!-- END doctoc generated TOC please keep comment here to allow auto update -->
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<!-- /TOC -->
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## Introduction
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This document describes the process of Whisk upgrade.
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```
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"""
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WHISK_FORK_EPOCH
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| cooldown
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v vsvv
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--+~~~~~~~~~~~~~~~~~~~~~----+-
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shuffling ^
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proposer selection
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candidate selection
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"""
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```
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## Configuration
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Warning: this configuration is not definitive.
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| Name | Value |
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| -------------------- | ----------------------- |
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| `WHISK_FORK_VERSION` | `Version('0x08000000')` |
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| `WHISK_FORK_EPOCH` | `Epoch(18446744073709551615)` **TBD** |
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## Fork to Whisk
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If `state.slot % SLOTS_PER_EPOCH == 0` and `compute_epoch_at_slot(state.slot) == WHISK_FORK_EPOCH`, an irregular state change is made to upgrade to Whisk. `WHISK_FORK_EPOCH` must be a multiple of `WHISK_RUN_DURATION_IN_EPOCHS`.
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The upgrade occurs after the completion of the inner loop of `process_slots` that sets `state.slot` equal to `WHISK_FORK_EPOCH * SLOTS_PER_EPOCH`.
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This ensures that we drop right into the beginning of the shuffling phase but without `process_whisk_epoch()` triggering for this Whisk run. Hence we handle all the setup ourselves in `upgrade_to_whisk()` below.
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```python
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def upgrade_to_whisk(pre: capella.BeaconState) -> BeaconState:
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# Compute initial unsafe trackers for all validators
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ks = [get_initial_whisk_k(ValidatorIndex(validator_index), 0) for validator_index in range(len(pre.validators))]
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whisk_k_commitments = [get_k_commitment(k) for k in ks]
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whisk_trackers = [get_initial_tracker(k) for k in ks]
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epoch = get_current_epoch(pre)
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post = BeaconState(
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# Versioning
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genesis_time=pre.genesis_time,
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genesis_validators_root=pre.genesis_validators_root,
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slot=pre.slot,
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fork=Fork(
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previous_version=pre.fork.current_version,
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current_version=WHISK_FORK_VERSION,
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epoch=epoch,
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),
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# History
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latest_block_header=pre.latest_block_header,
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block_roots=pre.block_roots,
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state_roots=pre.state_roots,
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historical_roots=pre.historical_roots,
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# Eth1
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eth1_data=pre.eth1_data,
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eth1_data_votes=pre.eth1_data_votes,
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eth1_deposit_index=pre.eth1_deposit_index,
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# Registry
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validators=[],
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balances=pre.balances,
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# Randomness
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randao_mixes=pre.randao_mixes,
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# Slashings
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slashings=pre.slashings,
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# Participation
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previous_epoch_participation=pre.previous_epoch_participation,
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current_epoch_participation=pre.current_epoch_participation,
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# Finality
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justification_bits=pre.justification_bits,
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previous_justified_checkpoint=pre.previous_justified_checkpoint,
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current_justified_checkpoint=pre.current_justified_checkpoint,
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finalized_checkpoint=pre.finalized_checkpoint,
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# Inactivity
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inactivity_scores=pre.inactivity_scores,
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# Sync
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current_sync_committee=pre.current_sync_committee,
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next_sync_committee=pre.next_sync_committee,
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# Execution-layer
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latest_execution_payload_header=pre.latest_execution_payload_header,
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# Withdrawals
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next_withdrawal_index=pre.next_withdrawal_index,
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next_withdrawal_validator_index=pre.next_withdrawal_validator_index,
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# Deep history valid from Capella onwards
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historical_summaries=pre.historical_summaries,
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# Whisk
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whisk_proposer_trackers=[WhiskTracker() for _ in range(WHISK_PROPOSER_TRACKERS_COUNT)], # [New in Whisk]
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whisk_candidate_trackers=[WhiskTracker() for _ in range(WHISK_CANDIDATE_TRACKERS_COUNT)], # [New in Whisk]
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whisk_trackers=whisk_trackers, # [New in Whisk]
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whisk_k_commitments=whisk_k_commitments, # [New in Whisk]
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)
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# Do a candidate selection followed by a proposer selection so that we have proposers for the upcoming day
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# Use an old epoch when selecting candidates so that we don't get the same seed as in the next candidate selection
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select_whisk_candidate_trackers(post, Epoch(saturating_sub(epoch, WHISK_PROPOSER_SELECTION_GAP + 1)))
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select_whisk_proposer_trackers(post, epoch)
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# Do a final round of candidate selection.
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# We need it so that we have something to shuffle over the upcoming shuffling phase.
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select_whisk_candidate_trackers(post, epoch)
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return post
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```
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