1883 lines
70 KiB
Nim
1883 lines
70 KiB
Nim
# beacon_chain
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# Copyright (c) 2018-2022 Status Research & Development GmbH
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# Licensed and distributed under either of
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# * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
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# * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
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# at your option. This file may not be copied, modified, or distributed except according to those terms.
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{.push raises: [Defect].}
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import
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std/[algorithm, options, sequtils, tables, sets],
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stew/[assign2, byteutils, results],
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metrics, snappy, chronicles,
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../spec/[beaconstate, eth2_merkleization, eth2_ssz_serialization, helpers,
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state_transition, validator],
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".."/beacon_chain_db,
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../spec/datatypes/[phase0, altair, bellatrix],
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"."/[block_pools_types, block_quarantine]
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export
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eth2_merkleization, eth2_ssz_serialization,
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block_pools_types, results, beacon_chain_db
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# https://github.com/ethereum/eth2.0-metrics/blob/master/metrics.md#interop-metrics
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declareGauge beacon_head_root, "Root of the head block of the beacon chain"
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declareGauge beacon_head_slot, "Slot of the head block of the beacon chain"
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# https://github.com/ethereum/eth2.0-metrics/blob/master/metrics.md#interop-metrics
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declareGauge beacon_finalized_epoch, "Current finalized epoch" # On epoch transition
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declareGauge beacon_finalized_root, "Current finalized root" # On epoch transition
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declareGauge beacon_current_justified_epoch, "Current justified epoch" # On epoch transition
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declareGauge beacon_current_justified_root, "Current justified root" # On epoch transition
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declareGauge beacon_previous_justified_epoch, "Current previously justified epoch" # On epoch transition
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declareGauge beacon_previous_justified_root, "Current previously justified root" # On epoch transition
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declareGauge beacon_reorgs_total_total, "Total occurrences of reorganizations of the chain" # On fork choice; backwards-compat name (used to be a counter)
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declareGauge beacon_reorgs_total, "Total occurrences of reorganizations of the chain" # Interop copy
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declareCounter beacon_state_data_cache_hits, "EpochRef hits"
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declareCounter beacon_state_data_cache_misses, "EpochRef misses"
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declareCounter beacon_state_rewinds, "State database rewinds"
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declareGauge beacon_active_validators, "Number of validators in the active validator set"
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declareGauge beacon_current_active_validators, "Number of validators in the active validator set" # Interop copy
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declareGauge beacon_pending_deposits, "Number of pending deposits (state.eth1_data.deposit_count - state.eth1_deposit_index)" # On block
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declareGauge beacon_processed_deposits_total, "Number of total deposits included on chain" # On block
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logScope: topics = "chaindag"
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const
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# When finality happens, we prune historical states from the database except
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# for a snapshort every 32 epochs from which replays can happen - there's a
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# balance here between making long replays and saving on disk space
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EPOCHS_PER_STATE_SNAPSHOT = 32
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proc putBlock*(
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dag: ChainDAGRef, signedBlock: ForkyTrustedSignedBeaconBlock) =
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dag.db.putBlock(signedBlock)
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proc updateState*(
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dag: ChainDAGRef, state: var ForkedHashedBeaconState, bsi: BlockSlotId, save: bool,
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cache: var StateCache): bool {.gcsafe.}
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template withStateVars*(
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stateInternal: var ForkedHashedBeaconState, body: untyped): untyped =
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## Inject a few more descriptive names for the members of `stateData` -
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## the stateData instance may get mutated through these names as well
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template state(): ForkedHashedBeaconState {.inject, used.} = stateInternal
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template stateRoot(): Eth2Digest {.inject, used.} =
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getStateRoot(stateInternal)
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body
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template withUpdatedState*(
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dag: ChainDAGRef, state: var ForkedHashedBeaconState,
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bsiParam: BlockSlotId, okBody: untyped, failureBody: untyped): untyped =
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## Helper template that updates stateData to a particular BlockSlot - usage of
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## stateData is unsafe outside of block, or across `await` boundaries
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block:
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let bsi {.inject.} = bsiParam
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var cache {.inject.} = StateCache()
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if updateState(dag, state, bsi, false, cache):
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template bid(): BlockId {.inject, used.} = bsi.bid
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withStateVars(state):
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okBody
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else:
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failureBody
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func get_effective_balances(validators: openArray[Validator], epoch: Epoch):
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seq[Gwei] =
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## Get the balances from a state as counted for fork choice
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result.newSeq(validators.len) # zero-init
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for i in 0 ..< result.len:
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# All non-active validators have a 0 balance
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let validator = unsafeAddr validators[i]
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if validator[].is_active_validator(epoch):
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result[i] = validator[].effective_balance
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proc updateValidatorKeys*(dag: ChainDAGRef, validators: openArray[Validator]) =
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# Update validator key cache - must be called every time a valid block is
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# applied to the state - this is important to ensure that when we sync blocks
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# without storing a state (non-epoch blocks essentially), the deposits from
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# those blocks are persisted to the in-database cache of immutable validator
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# data (but no earlier than that the whole block as been validated)
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dag.db.updateImmutableValidators(validators)
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proc updateFinalizedBlocks*(db: BeaconChainDB, newFinalized: openArray[BlockId]) =
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if db.db.readOnly: return # TODO abstraction leak - where to put this?
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db.withManyWrites:
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for bid in newFinalized:
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db.finalizedBlocks.insert(bid.slot, bid.root)
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func validatorKey*(
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dag: ChainDAGRef, index: ValidatorIndex or uint64): Option[CookedPubKey] =
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## Returns the validator pubkey for the index, assuming it's been observed
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## at any point in time - this function may return pubkeys for indicies that
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## are not (yet) part of the head state (if the key has been observed on a
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## non-head branch)!
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dag.db.immutableValidators.load(index)
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func validatorKey*(
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epochRef: EpochRef, index: ValidatorIndex or uint64): Option[CookedPubKey] =
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## Returns the validator pubkey for the index, assuming it's been observed
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## at any point in time - this function may return pubkeys for indicies that
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## are not (yet) part of the head state (if the key has been observed on a
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## non-head branch)!
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validatorKey(epochRef.dag, index)
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func init*(
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T: type EpochRef, dag: ChainDAGRef, state: ForkedHashedBeaconState,
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cache: var StateCache): T =
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let
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epoch = state.get_current_epoch()
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proposer_dependent_root = withState(state): state.proposer_dependent_root
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attester_dependent_root = withState(state): state.attester_dependent_root
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epochRef = EpochRef(
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dag: dag, # This gives access to the validator pubkeys through an EpochRef
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key: dag.epochAncestor(state.latest_block_id, epoch),
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eth1_data: getStateField(state, eth1_data),
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eth1_deposit_index: getStateField(state, eth1_deposit_index),
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current_justified_checkpoint:
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getStateField(state, current_justified_checkpoint),
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finalized_checkpoint: getStateField(state, finalized_checkpoint),
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proposer_dependent_root: proposer_dependent_root,
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shuffled_active_validator_indices:
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cache.get_shuffled_active_validator_indices(state, epoch),
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attester_dependent_root: attester_dependent_root,
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merge_transition_complete:
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case state.kind:
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of BeaconStateFork.Phase0: false
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of BeaconStateFork.Altair: false
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of BeaconStateFork.Bellatrix:
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# https://github.com/ethereum/consensus-specs/blob/v1.1.7/specs/merge/beacon-chain.md#is_merge_transition_complete
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state.bellatrixData.data.latest_execution_payload_header !=
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ExecutionPayloadHeader()
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)
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epochStart = epoch.start_slot()
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for i in 0'u64..<SLOTS_PER_EPOCH:
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epochRef.beacon_proposers[i] = get_beacon_proposer_index(
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state, cache, epochStart + i)
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# When fork choice runs, it will need the effective balance of the justified
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# checkpoint - we pre-load the balances here to avoid rewinding the justified
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# state later and compress them because not all checkpoints end up being used
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# for fork choice - specially during long periods of non-finalization
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proc snappyEncode(inp: openArray[byte]): seq[byte] =
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try:
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snappy.encode(inp)
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except CatchableError as err:
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raiseAssert err.msg
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epochRef.effective_balances_bytes =
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snappyEncode(SSZ.encode(
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List[Gwei, Limit VALIDATOR_REGISTRY_LIMIT](
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get_effective_balances(getStateField(state, validators).asSeq, epoch))))
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epochRef
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func effective_balances*(epochRef: EpochRef): seq[Gwei] =
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try:
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SSZ.decode(snappy.decode(epochRef.effective_balances_bytes, uint32.high),
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List[Gwei, Limit VALIDATOR_REGISTRY_LIMIT]).toSeq()
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except CatchableError as exc:
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raiseAssert exc.msg
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func getBlockRef*(dag: ChainDAGRef, root: Eth2Digest): Opt[BlockRef] =
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## Retrieve a resolved block reference, if available - this function does
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## not return historical finalized blocks, see `getBlockIdAtSlot` for a
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## function that covers the entire known history
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let key = KeyedBlockRef.asLookupKey(root)
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# HashSet lacks the api to do check-and-get in one lookup - `[]` will return
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# the copy of the instance in the set which has more fields than `root` set!
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if key in dag.forkBlocks:
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try: ok(dag.forkBlocks[key].blockRef())
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except KeyError: raiseAssert "contains"
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else:
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err()
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func getBlockIdAtSlot*(dag: ChainDAGRef, slot: Slot): Opt[BlockSlotId] =
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## Retrieve the canonical block at the given slot, or the last block that
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## comes before - similar to atSlot, but without the linear scan - may hit
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## the database to look up early indices.
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if slot == dag.genesis.slot:
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return ok BlockSlotId.init(dag.genesis, slot)
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if slot > dag.finalizedHead.slot:
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return dag.head.atSlot(slot).toBlockSlotId() # iterate to the given slot
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if slot >= dag.finalizedHead.blck.slot:
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# finalized head is still in memory
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return dag.finalizedHead.blck.atSlot(slot).toBlockSlotId()
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let finlow = dag.db.finalizedBlocks.low.expect("at least tailRef written")
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if slot >= finlow:
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var pos = slot
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while true:
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let root = dag.db.finalizedBlocks.get(pos)
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if root.isSome():
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return ok BlockSlotId.init(
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BlockId(root: root.get(), slot: pos), slot)
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doAssert pos > finlow, "We should have returned the finlow"
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pos = pos - 1
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err() # not backfilled yet, and not genesis
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proc getBlockId*(dag: ChainDAGRef, root: Eth2Digest): Opt[BlockId] =
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## Look up block id by root in history - useful for turning a root into a
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## slot - may hit the database, may return blocks that have since become
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## unviable - use `getBlockIdAtSlot` to check that the block is still viable
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## if used in a sensitive context
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block: # If we have a BlockRef, this is the fastest way to get a block id
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let blck = dag.getBlockRef(root)
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if blck.isOk():
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return ok(blck.get().bid)
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block: # We might have a summary in the database
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let summary = dag.db.getBeaconBlockSummary(root)
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if summary.isOk():
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return ok(BlockId(root: root, slot: summary.get().slot))
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err()
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func isCanonical*(dag: ChainDAGRef, bid: BlockId): bool =
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## Return true iff the given `bid` is part of the history selected by `dag.head`
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let current = dag.getBlockIdAtSlot(bid.slot).valueOr:
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return false # We don't know, so ..
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return current.bid == bid
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func parent*(dag: ChainDAGRef, bid: BlockId): Opt[BlockId] =
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if bid.slot == 0:
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return err()
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if bid.slot > dag.finalizedHead.slot:
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# Make sure we follow the correct history as there may be forks
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let blck = ? dag.getBlockRef(bid.root)
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doAssert not isNil(blck.parent), "should reach finalized head"
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return ok blck.parent.bid
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let bids = ? dag.getBlockIdAtSlot(bid.slot - 1)
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ok(bids.bid)
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func parentOrSlot*(dag: ChainDAGRef, bsi: BlockSlotId): Opt[BlockSlotId] =
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if bsi.slot == 0:
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return err()
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if bsi.isProposed:
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let parent = ? dag.parent(bsi.bid)
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ok BlockSlotId.init(parent, bsi.slot)
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else:
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ok BlockSlotId.init(bsi.bid, bsi.slot - 1)
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func atSlot*(dag: ChainDAGRef, bid: BlockId, slot: Slot): Opt[BlockSlotId] =
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if bid.slot > dag.finalizedHead.slot:
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let blck = ? dag.getBlockRef(bid.root)
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if slot > dag.finalizedHead.slot:
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return blck.atSlot(slot).toBlockSlotId()
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else:
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# Check if the given `bid` is still part of history - it might hail from an
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# orphaned fork
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let existing = ? dag.getBlockIdAtSlot(bid.slot)
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if existing.bid != bid:
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return err() # Not part of known / relevant history
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if existing.slot == slot: # and bid.slot == slot
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return ok existing
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if bid.slot <= slot:
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ok BlockSlotId.init(bid, slot)
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else:
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dag.getBlockIdAtSlot(slot)
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func epochAncestor*(dag: ChainDAGRef, bid: BlockId, epoch: Epoch): EpochKey =
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## The state transition works by storing information from blocks in a
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## "working" area until the epoch transition, then batching work collected
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## during the epoch. Thus, last block in the ancestor epochs is the block
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## that has an impact on epoch currently considered.
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##
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## This function returns an epoch key pointing to that epoch boundary, i.e. the
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## boundary where the last block has been applied to the state and epoch
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## processing has been done.
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if epoch < dag.tail.slot.epoch or bid.slot < dag.tail.slot:
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return EpochKey() # We can't load these states
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if epoch == dag.tail.slot.epoch:
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return EpochKey(bid: dag.tail, epoch: epoch)
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let bsi = dag.atSlot(bid, epoch.start_slot - 1).valueOr:
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# If we lack history for the given slot, we can use the given bid as epoch
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# ancestor
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return EpochKey(epoch: epoch, bid: bid)
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EpochKey(epoch: epoch, bid: bsi.bid)
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func findEpochRef*(
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dag: ChainDAGRef, bid: BlockId, epoch: Epoch): Opt[EpochRef] =
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## Look for an existing cached EpochRef, but unlike `getEpochRef`, don't
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## try to create one by recreating the epoch state
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let ancestor = dag.epochAncestor(bid, epoch)
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for i in 0..<dag.epochRefs.len:
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if dag.epochRefs[i] != nil and dag.epochRefs[i].key == ancestor:
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return ok(dag.epochRefs[i])
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err()
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func loadStateCache(
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dag: ChainDAGRef, cache: var StateCache, bid: BlockId, epoch: Epoch) =
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# When creating a state cache, we want the current and the previous epoch
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# information to be preloaded as both of these are used in state transition
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# functions
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template load(e: Epoch) =
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block:
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let epoch = e
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if epoch notin cache.shuffled_active_validator_indices:
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let epochRef = dag.findEpochRef(bid, epoch)
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if epochRef.isSome():
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cache.shuffled_active_validator_indices[epoch] =
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epochRef[].shuffled_active_validator_indices
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let start_slot = epoch.start_slot()
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for i, idx in epochRef[].beacon_proposers:
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cache.beacon_proposer_indices[start_slot + i] = idx
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load(epoch)
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if epoch > 0:
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load(epoch - 1)
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func containsForkBlock*(dag: ChainDAGRef, root: Eth2Digest): bool =
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## Checks for blocks at the finalized checkpoint or newer
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KeyedBlockRef.asLookupKey(root) in dag.forkBlocks
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proc containsBlock(
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cfg: RuntimeConfig, db: BeaconChainDB, slot: Slot, root: Eth2Digest): bool =
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db.containsBlock(root, cfg.blockForkAtEpoch(slot.epoch))
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func isFinalizedStateSnapshot(slot: Slot): bool =
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slot.is_epoch and slot.epoch mod EPOCHS_PER_STATE_SNAPSHOT == 0
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func isStateCheckpoint(dag: ChainDAGRef, bsi: BlockSlotId): bool =
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## State checkpoints are the points in time for which we store full state
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## snapshots, which later serve as rewind starting points when replaying state
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## transitions from database, for example during reorgs.
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##
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# As a policy, we only store epoch boundary states without the epoch block
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# (if it exists) applied - the rest can be reconstructed by loading an epoch
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# boundary state and applying the missing blocks.
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# We also avoid states that were produced with empty slots only - as such,
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# there is only a checkpoint for the first epoch after a block.
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# The tail block also counts as a state checkpoint!
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(bsi.isProposed and bsi.bid == dag.tail) or
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(bsi.slot.is_epoch and bsi.slot.epoch == (bsi.bid.slot.epoch + 1))
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proc getState(
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db: BeaconChainDB, fork: BeaconStateFork, state_root: Eth2Digest,
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state: var ForkedHashedBeaconState, rollback: RollbackProc): bool =
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if state.kind != fork:
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# Avoid temporary (!)
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state = (ref ForkedHashedBeaconState)(kind: fork)[]
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withState(state):
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if not db.getState(state_root, state.data, rollback):
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return false
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state.root = state_root
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true
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proc getState(
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db: BeaconChainDB, cfg: RuntimeConfig, block_root: Eth2Digest, slot: Slot,
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state: var ForkedHashedBeaconState, rollback: RollbackProc): bool =
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let state_root = db.getStateRoot(block_root, slot).valueOr:
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return false
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db.getState(cfg.stateForkAtEpoch(slot.epoch), state_root, state, rollback)
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proc getState(
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dag: ChainDAGRef, bsi: BlockSlotId, state: var ForkedHashedBeaconState): bool =
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## Load a state from the database given a block and a slot - this will first
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## lookup the state root in the state root table then load the corresponding
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## state, if it exists
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if not dag.isStateCheckpoint(bsi):
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return false
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let rollbackAddr =
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# Any restore point will do as long as it's not the object being updated
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if unsafeAddr(state) == unsafeAddr(dag.headState):
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unsafeAddr dag.clearanceState
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else:
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unsafeAddr dag.headState
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let v = addr state
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func rollback() =
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assign(v[], rollbackAddr[])
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dag.db.getState(dag.cfg, bsi.bid.root, bsi.slot, state, rollback)
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proc getForkedBlock*(db: BeaconChainDB, root: Eth2Digest):
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Opt[ForkedTrustedSignedBeaconBlock] =
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# When we only have a digest, we don't know which fork it's from so we try
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# them one by one - this should be used sparingly
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if (let blck = db.getBlock(root, bellatrix.TrustedSignedBeaconBlock);
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blck.isSome()):
|
|
ok(ForkedTrustedSignedBeaconBlock.init(blck.get()))
|
|
elif (let blck = db.getBlock(root, altair.TrustedSignedBeaconBlock);
|
|
blck.isSome()):
|
|
ok(ForkedTrustedSignedBeaconBlock.init(blck.get()))
|
|
elif (let blck = db.getBlock(root, phase0.TrustedSignedBeaconBlock);
|
|
blck.isSome()):
|
|
ok(ForkedTrustedSignedBeaconBlock.init(blck.get()))
|
|
else:
|
|
err()
|
|
|
|
proc getBlock*(
|
|
dag: ChainDAGRef, bid: BlockId,
|
|
T: type ForkyTrustedSignedBeaconBlock): Opt[T] =
|
|
dag.db.getBlock(bid.root, T)
|
|
|
|
proc getBlockSSZ*(dag: ChainDAGRef, bid: BlockId, bytes: var seq[byte]): bool =
|
|
# Load the SSZ-encoded data of a block into `bytes`, overwriting the existing
|
|
# content
|
|
# careful: there are two snappy encodings in use, with and without framing!
|
|
# Returns true if the block is found, false if not
|
|
let fork = dag.cfg.blockForkAtEpoch(bid.slot.epoch)
|
|
dag.db.getBlockSSZ(bid.root, bytes, fork)
|
|
|
|
proc getForkedBlock*(
|
|
dag: ChainDAGRef, bid: BlockId): Opt[ForkedTrustedSignedBeaconBlock] =
|
|
|
|
let fork = dag.cfg.blockForkAtEpoch(bid.slot.epoch)
|
|
result.ok(ForkedTrustedSignedBeaconBlock(kind: fork))
|
|
withBlck(result.get()):
|
|
type T = type(blck)
|
|
blck = getBlock(dag, bid, T).valueOr:
|
|
result.err()
|
|
return
|
|
|
|
proc getForkedBlock*(
|
|
dag: ChainDAGRef, root: Eth2Digest): Opt[ForkedTrustedSignedBeaconBlock] =
|
|
let bid = dag.getBlockId(root)
|
|
if bid.isSome():
|
|
dag.getForkedBlock(bid.get())
|
|
else:
|
|
# In case we didn't have a summary - should be rare, but ..
|
|
dag.db.getForkedBlock(root)
|
|
|
|
proc updateBeaconMetrics(
|
|
state: ForkedHashedBeaconState, bid: BlockId, cache: var StateCache) =
|
|
# https://github.com/ethereum/eth2.0-metrics/blob/master/metrics.md#additional-metrics
|
|
# both non-negative, so difference can't overflow or underflow int64
|
|
|
|
beacon_head_root.set(bid.root.toGaugeValue)
|
|
beacon_head_slot.set(bid.slot.toGaugeValue)
|
|
|
|
withState(state):
|
|
beacon_pending_deposits.set(
|
|
(state.data.eth1_data.deposit_count -
|
|
state.data.eth1_deposit_index).toGaugeValue)
|
|
beacon_processed_deposits_total.set(
|
|
state.data.eth1_deposit_index.toGaugeValue)
|
|
|
|
beacon_current_justified_epoch.set(
|
|
state.data.current_justified_checkpoint.epoch.toGaugeValue)
|
|
beacon_current_justified_root.set(
|
|
state.data.current_justified_checkpoint.root.toGaugeValue)
|
|
beacon_previous_justified_epoch.set(
|
|
state.data.previous_justified_checkpoint.epoch.toGaugeValue)
|
|
beacon_previous_justified_root.set(
|
|
state.data.previous_justified_checkpoint.root.toGaugeValue)
|
|
beacon_finalized_epoch.set(
|
|
state.data.finalized_checkpoint.epoch.toGaugeValue)
|
|
beacon_finalized_root.set(
|
|
state.data.finalized_checkpoint.root.toGaugeValue)
|
|
|
|
let active_validators = count_active_validators(
|
|
state.data, state.data.slot.epoch, cache).toGaugeValue
|
|
beacon_active_validators.set(active_validators)
|
|
beacon_current_active_validators.set(active_validators)
|
|
|
|
import blockchain_dag_light_client
|
|
|
|
export
|
|
blockchain_dag_light_client.getBestLightClientUpdateForPeriod,
|
|
blockchain_dag_light_client.getLatestLightClientUpdate,
|
|
blockchain_dag_light_client.getOptimisticLightClientUpdate,
|
|
blockchain_dag_light_client.getLightClientBootstrap
|
|
|
|
proc getViableHead(cfg: RuntimeConfig, db: BeaconChainDB): Opt[BlockId] =
|
|
# When the database has been written with a pre-fork version of the
|
|
# software, it may happen that blocks produced using an "unforked"
|
|
# chain get written to the database - we need to skip such blocks
|
|
# when loading the database with a fork-compatible version
|
|
let
|
|
headRoot = ? db.getHeadBlock()
|
|
|
|
for blck in db.getAncestorSummaries(headRoot):
|
|
if containsBlock(cfg, db, blck.summary.slot, blck.root):
|
|
return ok(BlockId(slot: blck.summary.slot, root: blck.root))
|
|
|
|
err()
|
|
|
|
proc putState(dag: ChainDAGRef, state: ForkedHashedBeaconState, bid: BlockId) =
|
|
# Store a state and its root
|
|
logScope:
|
|
blck = shortLog(bid)
|
|
stateSlot = shortLog(getStateField(state, slot))
|
|
stateRoot = shortLog(getStateRoot(state))
|
|
|
|
if not dag.isStateCheckpoint(BlockSlotId.init(bid, getStateField(state, slot))):
|
|
return
|
|
|
|
# Don't consider legacy tables here, they are slow to read so we'll want to
|
|
# rewrite things in the new table anyway.
|
|
if dag.db.containsState(getStateRoot(state), legacy = false):
|
|
return
|
|
|
|
let startTick = Moment.now()
|
|
# Ideally we would save the state and the root lookup cache in a single
|
|
# transaction to prevent database inconsistencies, but the state loading code
|
|
# is resilient against one or the other going missing
|
|
withState(state):
|
|
dag.db.putState(state)
|
|
|
|
debug "Stored state", putStateDur = Moment.now() - startTick
|
|
|
|
proc advanceSlots*(
|
|
dag: ChainDAGRef, state: var ForkedHashedBeaconState, slot: Slot, save: bool,
|
|
cache: var StateCache, info: var ForkedEpochInfo) =
|
|
# Given a state, advance it zero or more slots by applying empty slot
|
|
# processing - the state must be positioned at or before `slot`
|
|
doAssert getStateField(state, slot) <= slot
|
|
|
|
let stateBid = state.latest_block_id
|
|
while getStateField(state, slot) < slot:
|
|
let
|
|
preEpoch = getStateField(state, slot).epoch
|
|
|
|
loadStateCache(dag, cache, stateBid, getStateField(state, slot).epoch)
|
|
|
|
process_slots(
|
|
dag.cfg, state, getStateField(state, slot) + 1, cache, info,
|
|
dag.updateFlags).expect("process_slots shouldn't fail when state slot is correct")
|
|
if save:
|
|
dag.putState(state, stateBid)
|
|
|
|
# The reward information in the state transition is computed for epoch
|
|
# transitions - when transitioning into epoch N, the activities in epoch
|
|
# N-2 are translated into balance updates, and this is what we capture
|
|
# in the monitor. This may be inaccurate during a deep reorg (>1 epoch)
|
|
# which is an acceptable tradeoff for monitoring.
|
|
withState(state):
|
|
let postEpoch = state.data.slot.epoch
|
|
if preEpoch != postEpoch:
|
|
dag.validatorMonitor[].registerEpochInfo(postEpoch, info, state.data)
|
|
|
|
proc applyBlock(
|
|
dag: ChainDAGRef, state: var ForkedHashedBeaconState, bid: BlockId,
|
|
cache: var StateCache, info: var ForkedEpochInfo): Result[void, cstring] =
|
|
|
|
loadStateCache(dag, cache, bid, getStateField(state, slot).epoch)
|
|
|
|
case dag.cfg.blockForkAtEpoch(bid.slot.epoch)
|
|
of BeaconBlockFork.Phase0:
|
|
let data = getBlock(dag, bid, phase0.TrustedSignedBeaconBlock).valueOr:
|
|
return err("Block load failed")
|
|
state_transition(
|
|
dag.cfg, state, data, cache, info,
|
|
dag.updateFlags + {slotProcessed}, noRollback)
|
|
of BeaconBlockFork.Altair:
|
|
let data = getBlock(dag, bid, altair.TrustedSignedBeaconBlock).valueOr:
|
|
return err("Block load failed")
|
|
state_transition(
|
|
dag.cfg, state, data, cache, info,
|
|
dag.updateFlags + {slotProcessed}, noRollback)
|
|
of BeaconBlockFork.Bellatrix:
|
|
let data = getBlock(dag, bid, bellatrix.TrustedSignedBeaconBlock).valueOr:
|
|
return err("Block load failed")
|
|
state_transition(
|
|
dag.cfg, state, data, cache, info,
|
|
dag.updateFlags + {slotProcessed}, noRollback)
|
|
|
|
proc init*(T: type ChainDAGRef, cfg: RuntimeConfig, db: BeaconChainDB,
|
|
validatorMonitor: ref ValidatorMonitor, updateFlags: UpdateFlags,
|
|
onBlockCb: OnBlockCallback = nil, onHeadCb: OnHeadCallback = nil,
|
|
onReorgCb: OnReorgCallback = nil,
|
|
onFinCb: OnFinalizedCallback = nil,
|
|
onOptimisticLCUpdateCb: OnOptimisticLightClientUpdateCallback = nil,
|
|
serveLightClientData = false,
|
|
importLightClientData = ImportLightClientData.None): ChainDAGRef =
|
|
# TODO move fork version sanity checking elsewhere?
|
|
let forkVersions =
|
|
[cfg.GENESIS_FORK_VERSION, cfg.ALTAIR_FORK_VERSION,
|
|
cfg.BELLATRIX_FORK_VERSION, cfg.SHARDING_FORK_VERSION]
|
|
for i in 0 ..< forkVersions.len:
|
|
for j in i+1 ..< forkVersions.len:
|
|
doAssert forkVersions[i] != forkVersions[j]
|
|
|
|
doAssert cfg.ALTAIR_FORK_EPOCH <= cfg.BELLATRIX_FORK_EPOCH
|
|
doAssert cfg.BELLATRIX_FORK_EPOCH <= cfg.SHARDING_FORK_EPOCH
|
|
doAssert updateFlags in [{}, {verifyFinalization}],
|
|
"Other flags not supported in ChainDAG"
|
|
|
|
# TODO we require that the db contains both a head and a tail block -
|
|
# asserting here doesn't seem like the right way to go about it however..
|
|
|
|
# Tail is the first block for which we can construct a state - either
|
|
# genesis or a checkpoint
|
|
let
|
|
startTick = Moment.now()
|
|
genesisRoot = db.getGenesisBlock().expect(
|
|
"preInit should have initialized the database with a genesis block root")
|
|
tailRoot = db.getTailBlock().expect(
|
|
"preInit should have initialized the database with a tail block root")
|
|
tailBlock = db.getForkedBlock(tailRoot).expect(
|
|
"Tail block in database, corrupt?")
|
|
head = getViableHead(cfg, db).expect("Head root in database, corrupt?")
|
|
|
|
# Have to be careful with this instance, it is not yet fully initialized so
|
|
# as to avoid having to allocate a separate "init" state
|
|
dag = ChainDAGRef(
|
|
db: db,
|
|
validatorMonitor: validatorMonitor,
|
|
genesis: BlockId(root: genesisRoot, slot: GENESIS_SLOT),
|
|
tail: tailBlock.toBlockId(),
|
|
|
|
# The only allowed flag right now is verifyFinalization, as the others all
|
|
# allow skipping some validation.
|
|
updateFlags: {verifyFinalization} * updateFlags,
|
|
cfg: cfg,
|
|
|
|
serveLightClientData: serveLightClientData,
|
|
importLightClientData: importLightClientData,
|
|
|
|
onBlockAdded: onBlockCb,
|
|
onHeadChanged: onHeadCb,
|
|
onReorgHappened: onReorgCb,
|
|
onFinHappened: onFinCb,
|
|
onOptimisticLightClientUpdate: onOptimisticLCUpdateCb
|
|
)
|
|
loadTick = Moment.now()
|
|
|
|
var
|
|
headRef, curRef: BlockRef
|
|
slot = head.slot
|
|
# To know the finalized checkpoint of the head, we need to recreate its
|
|
# state - the tail is implicitly finalized, and if we have a finalized block
|
|
# table, that provides another hint
|
|
finalizedSlot = db.finalizedBlocks.high.get(dag.tail.slot)
|
|
newFinalized: seq[BlockId]
|
|
cache: StateCache
|
|
foundHeadState = false
|
|
headBlocks: seq[BlockRef]
|
|
|
|
# Load head -> finalized, or all summaries in case the finalized block table
|
|
# hasn't been written yet
|
|
for blck in db.getAncestorSummaries(head.root):
|
|
let newRef = BlockRef.init(blck.root, blck.summary.slot)
|
|
if headRef == nil:
|
|
doAssert blck.root == head.root
|
|
headRef = newRef
|
|
|
|
if curRef != nil:
|
|
link(newRef, curRef)
|
|
|
|
curRef = newRef
|
|
|
|
dag.forkBlocks.incl(KeyedBlockRef.init(curRef))
|
|
|
|
if not foundHeadState:
|
|
while slot >= blck.summary.slot:
|
|
# Try loading state from database - we need the head state early on to
|
|
# establish the (real) finalized checkpoint
|
|
if db.getState(cfg, blck.root, slot, dag.headState, noRollback):
|
|
# EpochRef needs an epoch boundary state
|
|
assign(dag.epochRefState, dag.headState)
|
|
|
|
var info: ForkedEpochInfo
|
|
|
|
while headBlocks.len > 0:
|
|
dag.applyBlock(
|
|
dag.headState, headBlocks.pop().bid, cache,
|
|
info).expect("head blocks should apply")
|
|
|
|
dag.head = headRef
|
|
|
|
assign(dag.clearanceState, dag.headState)
|
|
|
|
finalizedSlot =
|
|
max(finalizedSlot,
|
|
getStateField(dag.headState, finalized_checkpoint).epoch.start_slot)
|
|
foundHeadState = true
|
|
break
|
|
slot -= 1
|
|
|
|
slot += 1
|
|
|
|
if not foundHeadState:
|
|
headBlocks.add curRef
|
|
|
|
if curRef.slot <= finalizedSlot:
|
|
# Only non-finalized slots get a `BlockRef`
|
|
break
|
|
|
|
let summariesTick = Moment.now()
|
|
|
|
if not foundHeadState:
|
|
fatal "Could not load head state, database corrupt?",
|
|
head = shortLog(head), tail = shortLog(dag.tail),
|
|
genesis = shortLog(dag.genesis)
|
|
quit 1
|
|
|
|
let
|
|
configFork = case dag.headState.kind
|
|
of BeaconStateFork.Phase0: genesisFork(cfg)
|
|
of BeaconStateFork.Altair: altairFork(cfg)
|
|
of BeaconStateFork.Bellatrix: bellatrixFork(cfg)
|
|
statefork = getStateField(dag.headState, fork)
|
|
|
|
if stateFork != configFork:
|
|
error "State from database does not match network, check --network parameter",
|
|
genesis = dag.genesis, tail = dag.tail, headRef, stateFork, configFork
|
|
quit 1
|
|
|
|
# We used an interim finalizedHead while loading the head state above - now
|
|
# that we have loaded the dag up to the finalized slot, we can also set
|
|
# finalizedHead to its real value
|
|
dag.finalizedHead = headRef.atSlot(finalizedSlot)
|
|
dag.lastPrunePoint = dag.finalizedHead.toBlockSlotId().expect("not nil")
|
|
|
|
dag.heads = @[headRef]
|
|
|
|
doAssert dag.finalizedHead.blck != nil,
|
|
"The finalized head should exist at the slot"
|
|
doAssert dag.finalizedHead.blck.parent == nil,
|
|
"...but that's the last BlockRef with a parent"
|
|
|
|
block: # Top up finalized blocks
|
|
if db.finalizedBlocks.high.isNone or
|
|
db.finalizedBlocks.high.get() < dag.finalizedHead.blck.slot:
|
|
info "Loading finalized blocks",
|
|
finHigh = db.finalizedBlocks.high,
|
|
finalizedHead = shortLog(dag.finalizedHead)
|
|
|
|
for blck in db.getAncestorSummaries(dag.finalizedHead.blck.root):
|
|
if db.finalizedBlocks.high.isSome and
|
|
blck.summary.slot <= db.finalizedBlocks.high.get:
|
|
break
|
|
|
|
# Versions prior to 1.7.0 did not store finalized blocks in the
|
|
# database, and / or the application might have crashed between the head
|
|
# and finalized blocks updates.
|
|
newFinalized.add(BlockId(slot: blck.summary.slot, root: blck.root))
|
|
|
|
let finalizedBlocksTick = Moment.now()
|
|
db.updateFinalizedBlocks(newFinalized)
|
|
|
|
block:
|
|
let finalized = db.finalizedBlocks.get(db.finalizedBlocks.high.get()).expect(
|
|
"tail at least")
|
|
if finalized != dag.finalizedHead.blck.root:
|
|
error "Head does not lead to finalized block, database corrupt?",
|
|
head = shortLog(head), finalizedHead = shortLog(dag.finalizedHead),
|
|
tail = shortLog(dag.tail), finalized = shortLog(finalized)
|
|
quit 1
|
|
|
|
dag.backfill = block:
|
|
let backfillSlot = db.finalizedBlocks.low.expect("tail at least")
|
|
if backfillSlot < dag.tail.slot:
|
|
let backfillRoot = db.finalizedBlocks.get(backfillSlot).expect(
|
|
"low to be loadable")
|
|
|
|
db.getBeaconBlockSummary(backfillRoot).expect(
|
|
"Backfill block must have a summary")
|
|
else:
|
|
withBlck(tailBlock): blck.message.toBeaconBlockSummary()
|
|
|
|
dag.forkDigests = newClone ForkDigests.init(
|
|
cfg, getStateField(dag.headState, genesis_validators_root))
|
|
|
|
withState(dag.headState):
|
|
dag.validatorMonitor[].registerState(state.data)
|
|
|
|
updateBeaconMetrics(dag.headState, dag.head.bid, cache)
|
|
|
|
let finalizedTick = Moment.now()
|
|
# Fill validator key cache in case we're loading an old database that doesn't
|
|
# have a cache
|
|
dag.updateValidatorKeys(getStateField(dag.headState, validators).asSeq())
|
|
|
|
withState(dag.headState):
|
|
when stateFork >= BeaconStateFork.Altair:
|
|
dag.headSyncCommittees = state.data.get_sync_committee_cache(cache)
|
|
|
|
info "Block DAG initialized",
|
|
head = shortLog(dag.head),
|
|
finalizedHead = shortLog(dag.finalizedHead),
|
|
tail = shortLog(dag.tail),
|
|
backfill = (dag.backfill.slot, shortLog(dag.backfill.parent_root)),
|
|
loadDur = loadTick - startTick,
|
|
summariesDur = summariesTick - loadTick,
|
|
finalizedDur = finalizedTick - summariesTick,
|
|
keysDur = Moment.now() - finalizedTick
|
|
|
|
dag.initLightClientCache()
|
|
|
|
dag
|
|
|
|
template genesisValidatorsRoot*(dag: ChainDAGRef): Eth2Digest =
|
|
getStateField(dag.headState, genesis_validators_root)
|
|
|
|
func getEpochRef*(
|
|
dag: ChainDAGRef, state: ForkedHashedBeaconState, cache: var StateCache): EpochRef =
|
|
## Get a cached `EpochRef` or construct one based on the given state - always
|
|
## returns an EpochRef instance
|
|
let
|
|
bid = state.latest_block_id
|
|
epoch = state.get_current_epoch()
|
|
|
|
var epochRef = dag.findEpochRef(bid, epoch)
|
|
if epochRef.isErr:
|
|
let res = EpochRef.init(dag, state, cache)
|
|
if epoch >= dag.finalizedHead.slot.epoch():
|
|
# Only cache epoch information for unfinalized blocks - earlier states
|
|
# are seldomly used (ie RPC), so no need to cache
|
|
|
|
# Because we put a cap on the number of epochRefs we store, we want to
|
|
# prune the least useful state - for now, we'll assume that to be the
|
|
# oldest epochRef we know about.
|
|
|
|
var
|
|
oldest = 0
|
|
for x in 0..<dag.epochRefs.len:
|
|
let candidate = dag.epochRefs[x]
|
|
if candidate == nil:
|
|
oldest = x
|
|
break
|
|
if candidate.key.epoch < dag.epochRefs[oldest].epoch:
|
|
oldest = x
|
|
|
|
dag.epochRefs[oldest] = res
|
|
res
|
|
else:
|
|
epochRef.get()
|
|
|
|
proc getEpochRef*(
|
|
dag: ChainDAGRef, bid: BlockId, epoch: Epoch,
|
|
preFinalized: bool): Opt[EpochRef] =
|
|
## Return a cached EpochRef or construct one from the database, if possible -
|
|
## returns `none` on failure.
|
|
##
|
|
## When `preFinalized` is true, include epochs from before the finalized
|
|
## checkpoint in the search - this potentially can result in long processing
|
|
## times due to state replays.
|
|
##
|
|
## Requests for epochs >= dag.finalizedHead.slot.epoch always return an
|
|
## instance. One must be careful to avoid race conditions in `async` code
|
|
## where the finalized head might change during an `await`.
|
|
##
|
|
## Requests for epochs < dag.finalizedHead.slot.epoch may fail, either because
|
|
## the search was limited by the `preFinalized` flag or because state history
|
|
## has been pruned - none will be returned in this case.
|
|
if not preFinalized and epoch < dag.finalizedHead.slot.epoch:
|
|
return err()
|
|
|
|
if bid.slot < dag.tail.slot or epoch < dag.tail.slot.epoch:
|
|
return err()
|
|
|
|
let epochRef = dag.findEpochRef(bid, epoch)
|
|
if epochRef.isOk():
|
|
beacon_state_data_cache_hits.inc
|
|
return epochRef
|
|
|
|
beacon_state_data_cache_misses.inc
|
|
|
|
# TODO instead of using the epoch ancestor, we should really be looking
|
|
# for _any_ state in the desired epoch in the history of bid since the
|
|
# epoch values remain unchanged: currently `epochAncestor` itself
|
|
# contains a work-around for the tail state, but it would be better to
|
|
# turn that work-around into a more efficient loading solution here
|
|
let
|
|
ancestor = dag.epochAncestor(bid, epoch)
|
|
|
|
var cache: StateCache
|
|
if not updateState(
|
|
dag, dag.epochRefState, ? dag.atSlot(ancestor.bid, epoch.start_slot),
|
|
false, cache):
|
|
return err()
|
|
|
|
ok(dag.getEpochRef(dag.epochRefState, cache))
|
|
|
|
proc getEpochRef*(
|
|
dag: ChainDAGRef, blck: BlockRef, epoch: Epoch,
|
|
preFinalized: bool): Opt[EpochRef] =
|
|
dag.getEpochRef(blck.bid, epoch, preFinalized)
|
|
|
|
proc getFinalizedEpochRef*(dag: ChainDAGRef): EpochRef =
|
|
dag.getEpochRef(
|
|
dag.finalizedHead.blck, dag.finalizedHead.slot.epoch, false).expect(
|
|
"getEpochRef for finalized head should always succeed")
|
|
|
|
func stateCheckpoint*(dag: ChainDAGRef, bsi: BlockSlotId): BlockSlotId =
|
|
## The first ancestor BlockSlot that is a state checkpoint
|
|
var bsi = bsi
|
|
while not dag.isStateCheckPoint(bsi):
|
|
if bsi.isProposed:
|
|
bsi.bid = dag.parent(bsi.bid).valueOr:
|
|
break
|
|
else:
|
|
bsi.slot = bsi.slot - 1
|
|
bsi
|
|
|
|
template forkAtEpoch*(dag: ChainDAGRef, epoch: Epoch): Fork =
|
|
forkAtEpoch(dag.cfg, epoch)
|
|
|
|
func forkDigestAtEpoch*(dag: ChainDAGRef, epoch: Epoch): ForkDigest =
|
|
case dag.cfg.stateForkAtEpoch(epoch)
|
|
of BeaconStateFork.Bellatrix: dag.forkDigests.bellatrix
|
|
of BeaconStateFork.Altair: dag.forkDigests.altair
|
|
of BeaconStateFork.Phase0: dag.forkDigests.phase0
|
|
|
|
proc getBlockRange*(
|
|
dag: ChainDAGRef, startSlot: Slot, skipStep: uint64,
|
|
output: var openArray[BlockId]): Natural =
|
|
## This function populates an `output` buffer of blocks
|
|
## with a slots ranging from `startSlot` up to, but not including,
|
|
## `startSlot + skipStep * output.len`, skipping any slots that don't have
|
|
## a block.
|
|
##
|
|
## Blocks will be written to `output` from the end without gaps, even if
|
|
## a block is missing in a particular slot. The return value shows how
|
|
## many slots were missing blocks - to iterate over the result, start
|
|
## at this index.
|
|
##
|
|
## If there were no blocks in the range, `output.len` will be returned.
|
|
let
|
|
requestedCount = output.lenu64
|
|
headSlot = dag.head.slot
|
|
|
|
trace "getBlockRange entered",
|
|
head = shortLog(dag.head.root), requestedCount, startSlot, skipStep, headSlot
|
|
|
|
if startSlot < dag.backfill.slot:
|
|
notice "Got request for pre-backfill slot",
|
|
startSlot, backfillSlot = dag.backfill.slot
|
|
return output.len
|
|
|
|
if headSlot <= startSlot or requestedCount == 0:
|
|
return output.len # Identical to returning an empty set of block as indicated above
|
|
|
|
let
|
|
runway = uint64(headSlot - startSlot)
|
|
|
|
# This is the number of blocks that will follow the start block
|
|
extraSlots = min(runway div skipStep, requestedCount - 1)
|
|
|
|
# If `skipStep` is very large, `extraSlots` should be 0 from
|
|
# the previous line, so `endSlot` will be equal to `startSlot`:
|
|
endSlot = startSlot + extraSlots * skipStep
|
|
|
|
var
|
|
curSlot = endSlot
|
|
o = output.len
|
|
|
|
# Process all blocks that follow the start block (may be zero blocks)
|
|
while curSlot > startSlot:
|
|
let bs = dag.getBlockIdAtSlot(curSlot)
|
|
if bs.isSome and bs.get().isProposed():
|
|
o -= 1
|
|
output[o] = bs.get().bid
|
|
curSlot -= skipStep
|
|
|
|
# Handle start slot separately (to avoid underflow when computing curSlot)
|
|
let bs = dag.getBlockIdAtSlot(startSlot)
|
|
if bs.isSome and bs.get().isProposed():
|
|
o -= 1
|
|
output[o] = bs.get().bid
|
|
|
|
o # Return the index of the first non-nil item in the output
|
|
|
|
proc updateState*(
|
|
dag: ChainDAGRef, state: var ForkedHashedBeaconState, bsi: BlockSlotId,
|
|
save: bool, cache: var StateCache): bool =
|
|
## Rewind or advance state such that it matches the given block and slot -
|
|
## this may include replaying from an earlier snapshot if blck is on a
|
|
## different branch or has advanced to a higher slot number than slot
|
|
## If `bs.slot` is higher than `bs.blck.slot`, `updateState` will fill in
|
|
## with empty/non-block slots
|
|
|
|
# First, see if we're already at the requested block. If we are, also check
|
|
# that the state has not been advanced past the desired block - if it has,
|
|
# an earlier state must be loaded since there's no way to undo the slot
|
|
# transitions
|
|
|
|
let
|
|
startTick = Moment.now()
|
|
current {.used.} = withState(state):
|
|
BlockSlotId.init(state.latest_block_id, state.data.slot)
|
|
|
|
var
|
|
ancestors: seq[BlockId]
|
|
found = false
|
|
|
|
template exactMatch(state: ForkedHashedBeaconState, bsi: BlockSlotId): bool =
|
|
# The block is the same and we're at an early enough slot - the state can
|
|
# be used to arrive at the desired blockslot
|
|
state.matches_block_slot(bsi.bid.root, bsi.slot)
|
|
|
|
template canAdvance(state: ForkedHashedBeaconState, bsi: BlockSlotId): bool =
|
|
# The block is the same and we're at an early enough slot - the state can
|
|
# be used to arrive at the desired blockslot
|
|
state.can_advance_slots(bsi.bid.root, bsi.slot)
|
|
|
|
# Fast path: check all caches for an exact match - this is faster than
|
|
# advancing a state where there's epoch processing to do, by a wide margin -
|
|
# it also avoids `hash_tree_root` for slot processing
|
|
if exactMatch(state, bsi):
|
|
found = true
|
|
elif not save:
|
|
# When required to save states, we cannot rely on the caches because that
|
|
# would skip the extra processing that save does - not all information that
|
|
# goes into the database is cached
|
|
if exactMatch(dag.headState, bsi):
|
|
assign(state, dag.headState)
|
|
found = true
|
|
elif exactMatch(dag.clearanceState, bsi):
|
|
assign(state, dag.clearanceState)
|
|
found = true
|
|
elif exactMatch(dag.epochRefState, bsi):
|
|
assign(state, dag.epochRefState)
|
|
found = true
|
|
|
|
const RewindBlockThreshold = 64
|
|
|
|
if not found:
|
|
# No exact match found - see if any in-memory state can be used as a base
|
|
# onto which we can apply a few blocks - there's a tradeoff here between
|
|
# loading the state from disk and performing the block applications
|
|
var cur = bsi
|
|
while ancestors.len < RewindBlockThreshold:
|
|
if isZero(cur.bid.root): # tail reached
|
|
break
|
|
|
|
if canAdvance(state, cur): # Typical case / fast path when there's no reorg
|
|
found = true
|
|
break
|
|
|
|
if not save: # see above
|
|
if canAdvance(dag.headState, cur):
|
|
assign(state, dag.headState)
|
|
found = true
|
|
break
|
|
|
|
if canAdvance(dag.clearanceState, cur):
|
|
assign(state, dag.clearanceState)
|
|
found = true
|
|
break
|
|
|
|
if canAdvance(dag.epochRefState, cur):
|
|
assign(state, dag.epochRefState)
|
|
found = true
|
|
break
|
|
|
|
if cur.isProposed():
|
|
# This is not an empty slot, so the block will need to be applied to
|
|
# eventually reach bs
|
|
ancestors.add(cur.bid)
|
|
|
|
# Move slot by slot to capture epoch boundary states
|
|
# TODO https://github.com/nim-lang/Nim/issues/19613
|
|
cur = dag.parentOrSlot(cur).valueOr:
|
|
break
|
|
|
|
if not found:
|
|
debug "UpdateStateData cache miss",
|
|
current = shortLog(current), target = shortLog(bsi)
|
|
|
|
# Either the state is too new or was created by applying a different block.
|
|
# We'll now resort to loading the state from the database then reapplying
|
|
# blocks until we reach the desired point in time.
|
|
|
|
var cur = bsi
|
|
ancestors.setLen(0)
|
|
|
|
# Look for a state in the database and load it - as long as it cannot be
|
|
# found, keep track of the blocks that are needed to reach it from the
|
|
# state that eventually will be found.
|
|
# If we hit the tail, it means that we've reached a point for which we can
|
|
# no longer recreate history - this happens for example when starting from
|
|
# a checkpoint block
|
|
let startEpoch = bsi.slot.epoch
|
|
while not canAdvance(state, cur) and not dag.db.getState(dag.cfg, cur.bid.root, cur.slot, state, noRollback):
|
|
# There's no state saved for this particular BlockSlot combination, and
|
|
# the state we have can't trivially be advanced (in case it was older than
|
|
# RewindBlockThreshold), keep looking..
|
|
if cur.isProposed():
|
|
# This is not an empty slot, so the block will need to be applied to
|
|
# eventually reach bs
|
|
ancestors.add(cur.bid)
|
|
|
|
if cur.slot == GENESIS_SLOT or
|
|
(cur.slot.epoch + EPOCHS_PER_STATE_SNAPSHOT * 2 < startEpoch):
|
|
# We've either walked two full state snapshot lengths or hit the tail
|
|
# and still can't find a matching state: this can happen when
|
|
# starting the node from an arbitrary finalized checkpoint and not
|
|
# backfilling the states
|
|
notice "Request for pruned historical state",
|
|
request = shortLog(bsi), tail = shortLog(dag.tail),
|
|
cur = shortLog(cur)
|
|
return false
|
|
|
|
# Move slot by slot to capture epoch boundary states
|
|
# TODO https://github.com/nim-lang/Nim/issues/19613
|
|
cur = dag.parentOrSlot(cur).valueOr:
|
|
notice "Request for pruned historical state",
|
|
request = shortLog(bsi), tail = shortLog(dag.tail),
|
|
cur = shortLog(cur)
|
|
return false
|
|
|
|
beacon_state_rewinds.inc()
|
|
|
|
# Starting state has been assigned, either from memory or database
|
|
let
|
|
assignTick = Moment.now()
|
|
ancestor {.used.} = withState(state):
|
|
BlockSlotId.init(state.latest_block_id, state.data.slot)
|
|
ancestorRoot {.used.} = getStateRoot(state)
|
|
|
|
var info: ForkedEpochInfo
|
|
# Time to replay all the blocks between then and now
|
|
for i in countdown(ancestors.len - 1, 0):
|
|
# Because the ancestors are in the database, there's no need to persist them
|
|
# again. Also, because we're applying blocks that were loaded from the
|
|
# database, we can skip certain checks that have already been performed
|
|
# before adding the block to the database.
|
|
if dag.applyBlock(state, ancestors[i], cache, info).isErr:
|
|
return false
|
|
|
|
# ...and make sure to process empty slots as requested
|
|
dag.advanceSlots(state, bsi.slot, save, cache, info)
|
|
|
|
# ...and make sure to load the state cache, if it exists
|
|
loadStateCache(dag, cache, bsi.bid, getStateField(state, slot).epoch)
|
|
|
|
let
|
|
assignDur = assignTick - startTick
|
|
replayDur = Moment.now() - assignTick
|
|
|
|
# TODO https://github.com/status-im/nim-chronicles/issues/108
|
|
if (assignDur + replayDur) >= 250.millis:
|
|
# This might indicate there's a cache that's not in order or a disk that is
|
|
# too slow - for now, it's here for investigative purposes and the cutoff
|
|
# time might need tuning
|
|
info "State replayed",
|
|
blocks = ancestors.len,
|
|
slots = getStateField(state, slot) - ancestor.slot,
|
|
current = shortLog(current),
|
|
ancestor = shortLog(ancestor),
|
|
target = shortLog(bsi),
|
|
ancestorStateRoot = shortLog(ancestorRoot),
|
|
targetStateRoot = shortLog(getStateRoot(state)),
|
|
found,
|
|
assignDur,
|
|
replayDur
|
|
elif ancestors.len > 0:
|
|
debug "State replayed",
|
|
blocks = ancestors.len,
|
|
slots = getStateField(state, slot) - ancestor.slot,
|
|
current = shortLog(current),
|
|
ancestor = shortLog(ancestor),
|
|
target = shortLog(bsi),
|
|
ancestorStateRoot = shortLog(ancestorRoot),
|
|
targetStateRoot = shortLog(getStateRoot(state)),
|
|
found,
|
|
assignDur,
|
|
replayDur
|
|
else: # Normal case!
|
|
trace "State advanced",
|
|
blocks = ancestors.len,
|
|
slots = getStateField(state, slot) - ancestor.slot,
|
|
current = shortLog(current),
|
|
ancestor = shortLog(ancestor),
|
|
target = shortLog(bsi),
|
|
ancestorStateRoot = shortLog(ancestorRoot),
|
|
targetStateRoot = shortLog(getStateRoot(state)),
|
|
found,
|
|
assignDur,
|
|
replayDur
|
|
|
|
true
|
|
|
|
proc delState(dag: ChainDAGRef, bsi: BlockSlotId) =
|
|
# Delete state state and mapping for a particular block+slot
|
|
if not dag.isStateCheckpoint(bsi):
|
|
return # We only ever save epoch states
|
|
|
|
if (let root = dag.db.getStateRoot(bsi.bid.root, bsi.slot); root.isSome()):
|
|
dag.db.delState(root.get())
|
|
dag.db.delStateRoot(bsi.bid.root, bsi.slot)
|
|
|
|
proc pruneBlocksDAG(dag: ChainDAGRef) =
|
|
## This prunes the block DAG
|
|
## This does NOT prune the cached state checkpoints and EpochRef
|
|
## This must be done after a new finalization point is reached
|
|
## to invalidate pending blocks or attestations referring
|
|
## to a now invalid fork.
|
|
##
|
|
## This does NOT update the `dag.lastPrunePoint` field.
|
|
## as the caches and fork choice can be pruned at a later time.
|
|
|
|
# Clean up block refs, walking block by block
|
|
let startTick = Moment.now()
|
|
|
|
# Finalization means that we choose a single chain as the canonical one -
|
|
# it also means we're no longer interested in any branches from that chain
|
|
# up to the finalization point
|
|
let hlen = dag.heads.len
|
|
for i in 0..<hlen:
|
|
let n = hlen - i - 1
|
|
let head = dag.heads[n]
|
|
if dag.finalizedHead.blck.isAncestorOf(head):
|
|
continue
|
|
|
|
var cur = head.atSlot()
|
|
# The block whose parent is nil is the `BlockRef` that's part of the
|
|
# canonical chain but has now been finalized - in theory there could be
|
|
# states at empty slot iff the fork had epoch-long gaps where the epoch
|
|
# transition was not on the canonical chain - these will not properly get
|
|
# cleaned up by the current logic - but they should also be rare
|
|
# TODO clean up the above as well
|
|
doAssert dag.finalizedHead.blck.parent == nil,
|
|
"finalizedHead parent should have been pruned from memory already"
|
|
|
|
while cur.blck.parent != nil:
|
|
# TODO: should we move that disk I/O to `onSlotEnd`
|
|
dag.delState(cur.toBlockSlotId().expect("not nil"))
|
|
|
|
if cur.isProposed():
|
|
# Update light client data
|
|
dag.deleteLightClientData(cur.blck.bid)
|
|
|
|
dag.forkBlocks.excl(KeyedBlockRef.init(cur.blck))
|
|
dag.db.delBlock(cur.blck.root)
|
|
|
|
cur = cur.parentOrSlot
|
|
|
|
dag.heads.del(n)
|
|
|
|
debug "Pruned the blockchain DAG",
|
|
currentCandidateHeads = dag.heads.len,
|
|
prunedHeads = hlen - dag.heads.len,
|
|
dagPruneDur = Moment.now() - startTick
|
|
|
|
iterator syncSubcommittee*(
|
|
syncCommittee: openArray[ValidatorIndex],
|
|
subcommitteeIdx: SyncSubcommitteeIndex): ValidatorIndex =
|
|
var i = subcommitteeIdx.asInt * SYNC_SUBCOMMITTEE_SIZE
|
|
let onePastEndIdx = min(syncCommittee.len, i + SYNC_SUBCOMMITTEE_SIZE)
|
|
|
|
while i < onePastEndIdx:
|
|
yield syncCommittee[i]
|
|
inc i
|
|
|
|
iterator syncSubcommitteePairs*(
|
|
syncCommittee: openArray[ValidatorIndex],
|
|
subcommitteeIdx: SyncSubcommitteeIndex): tuple[validatorIdx: ValidatorIndex,
|
|
subcommitteeIdx: int] =
|
|
var i = subcommitteeIdx.asInt * SYNC_SUBCOMMITTEE_SIZE
|
|
let onePastEndIdx = min(syncCommittee.len, i + SYNC_SUBCOMMITTEE_SIZE)
|
|
|
|
while i < onePastEndIdx:
|
|
yield (syncCommittee[i], i)
|
|
inc i
|
|
|
|
func syncCommitteeParticipants*(dag: ChainDAGRef,
|
|
slot: Slot): seq[ValidatorIndex] =
|
|
withState(dag.headState):
|
|
when stateFork >= BeaconStateFork.Altair:
|
|
let
|
|
period = sync_committee_period(slot)
|
|
curPeriod = sync_committee_period(state.data.slot)
|
|
|
|
if period == curPeriod:
|
|
@(dag.headSyncCommittees.current_sync_committee)
|
|
elif period == curPeriod + 1:
|
|
@(dag.headSyncCommittees.next_sync_committee)
|
|
else: @[]
|
|
else:
|
|
@[]
|
|
|
|
func getSubcommitteePositionsAux(
|
|
dag: ChainDAGRef,
|
|
syncCommittee: openArray[ValidatorIndex],
|
|
subcommitteeIdx: SyncSubcommitteeIndex,
|
|
validatorIdx: uint64): seq[uint64] =
|
|
var pos = 0'u64
|
|
for valIdx in syncCommittee.syncSubcommittee(subcommitteeIdx):
|
|
if validatorIdx == uint64(valIdx):
|
|
result.add pos
|
|
inc pos
|
|
|
|
func getSubcommitteePositions*(
|
|
dag: ChainDAGRef,
|
|
slot: Slot,
|
|
subcommitteeIdx: SyncSubcommitteeIndex,
|
|
validatorIdx: uint64): seq[uint64] =
|
|
withState(dag.headState):
|
|
when stateFork >= BeaconStateFork.Altair:
|
|
let
|
|
period = sync_committee_period(slot)
|
|
curPeriod = sync_committee_period(state.data.slot)
|
|
|
|
template search(syncCommittee: openArray[ValidatorIndex]): seq[uint64] =
|
|
dag.getSubcommitteePositionsAux(
|
|
syncCommittee, subcommitteeIdx, validatorIdx)
|
|
|
|
if period == curPeriod:
|
|
search(dag.headSyncCommittees.current_sync_committee)
|
|
elif period == curPeriod + 1:
|
|
search(dag.headSyncCommittees.next_sync_committee)
|
|
else: @[]
|
|
else:
|
|
@[]
|
|
|
|
template syncCommitteeParticipants*(
|
|
dag: ChainDAGRef,
|
|
slot: Slot,
|
|
subcommitteeIdx: SyncSubcommitteeIndex): seq[ValidatorIndex] =
|
|
toSeq(syncSubcommittee(dag.syncCommitteeParticipants(slot), subcommitteeIdx))
|
|
|
|
iterator syncCommitteeParticipants*(
|
|
dag: ChainDAGRef,
|
|
slot: Slot,
|
|
subcommitteeIdx: SyncSubcommitteeIndex,
|
|
aggregationBits: SyncCommitteeAggregationBits): ValidatorIndex =
|
|
for pos, valIdx in dag.syncCommitteeParticipants(slot, subcommitteeIdx):
|
|
if pos < aggregationBits.bits and aggregationBits[pos]:
|
|
yield valIdx
|
|
|
|
func needStateCachesAndForkChoicePruning*(dag: ChainDAGRef): bool =
|
|
dag.lastPrunePoint != dag.finalizedHead.toBlockSlotId().expect("not nil")
|
|
|
|
proc pruneStateCachesDAG*(dag: ChainDAGRef) =
|
|
## This prunes the cached state checkpoints and EpochRef
|
|
## This does NOT prune the state associated with invalidated blocks on a fork
|
|
## They are pruned via `pruneBlocksDAG`
|
|
##
|
|
## This updates the `dag.lastPrunePoint` variable
|
|
doAssert dag.needStateCachesAndForkChoicePruning()
|
|
let startTick = Moment.now()
|
|
block: # Remove states, walking slot by slot
|
|
# We remove all state checkpoints that come _before_ the current finalized
|
|
# head, as we might frequently be asked to replay states from the
|
|
# finalized checkpoint and onwards (for example when validating blocks and
|
|
# attestations)
|
|
var
|
|
finPoint = dag.finalizedHead.toBlockSlotId().expect("not nil")
|
|
cur = dag.parentOrSlot(dag.stateCheckpoint(finPoint))
|
|
prev = dag.parentOrSlot(dag.stateCheckpoint(dag.lastPrunePoint))
|
|
|
|
while cur.isSome and prev.isSome and cur.get() != prev.get():
|
|
if not isFinalizedStateSnapshot(cur.get().slot) and
|
|
cur.get().slot != dag.tail.slot:
|
|
dag.delState(cur.get())
|
|
cur = dag.parentOrSlot(cur.get())
|
|
|
|
let statePruneTick = Moment.now()
|
|
|
|
block: # Clean up old EpochRef instances
|
|
# After finalization, we can clear up the epoch cache and save memory -
|
|
# it will be recomputed if needed
|
|
for i in 0..<dag.epochRefs.len:
|
|
if dag.epochRefs[i] != nil and
|
|
dag.epochRefs[i].epoch < dag.finalizedHead.slot.epoch:
|
|
dag.epochRefs[i] = nil
|
|
let epochRefPruneTick = Moment.now()
|
|
|
|
dag.lastPrunePoint = dag.finalizedHead.toBlockSlotId().expect("not nil")
|
|
|
|
debug "Pruned the state checkpoints and DAG caches.",
|
|
statePruneDur = statePruneTick - startTick,
|
|
epochRefPruneDur = epochRefPruneTick - statePruneTick
|
|
|
|
proc updateHead*(
|
|
dag: ChainDAGRef,
|
|
newHead: BlockRef,
|
|
quarantine: var Quarantine) =
|
|
## Update what we consider to be the current head, as given by the fork
|
|
## choice.
|
|
##
|
|
## The choice of head affects the choice of finalization point - the order
|
|
## of operations naturally becomes important here - after updating the head,
|
|
## blocks that were once considered potential candidates for a tree will
|
|
## now fall from grace, or no longer be considered resolved.
|
|
doAssert not newHead.isNil()
|
|
|
|
let
|
|
lastHead = dag.head
|
|
|
|
logScope:
|
|
newHead = shortLog(newHead)
|
|
lastHead = shortLog(lastHead)
|
|
|
|
if lastHead == newHead:
|
|
trace "No head block update"
|
|
return
|
|
|
|
if newHead.parent.isNil:
|
|
# The new head should always have the finalizedHead as ancestor - thus,
|
|
# this should not happen except in a race condition where the selected
|
|
# `BlockRef` had its parent set to nil as happens during finalization -
|
|
# notably, resetting the head to be the finalizedHead is not allowed
|
|
error "Cannot update head to block without parent"
|
|
return
|
|
|
|
let
|
|
lastHeadStateRoot = getStateRoot(dag.headState)
|
|
|
|
# Start off by making sure we have the right state - updateState will try
|
|
# to use existing in-memory states to make this smooth
|
|
var cache: StateCache
|
|
if not updateState(
|
|
dag, dag.headState, newHead.bid.atSlot(), false, cache):
|
|
# Advancing the head state should never fail, given that the tail is
|
|
# implicitly finalised, the head is an ancestor of the tail and we always
|
|
# store the tail state in the database, as well as every epoch slot state in
|
|
# between
|
|
fatal "Unable to load head state during head update, database corrupt?",
|
|
lastHead = shortLog(lastHead)
|
|
quit 1
|
|
dag.head = newHead
|
|
|
|
dag.db.putHeadBlock(newHead.root)
|
|
|
|
updateBeaconMetrics(dag.headState, dag.head.bid, cache)
|
|
|
|
withState(dag.headState):
|
|
when stateFork >= BeaconStateFork.Altair:
|
|
dag.headSyncCommittees = state.data.get_sync_committee_cache(cache)
|
|
|
|
let
|
|
finalized_checkpoint =
|
|
getStateField(dag.headState, finalized_checkpoint)
|
|
finalizedSlot = max(finalized_checkpoint.epoch.start_slot(), dag.tail.slot)
|
|
finalizedHead = newHead.atSlot(finalizedSlot)
|
|
|
|
doAssert (not finalizedHead.blck.isNil),
|
|
"Block graph should always lead to a finalized block"
|
|
|
|
# Update light client data
|
|
dag.processHeadChangeForLightClient()
|
|
|
|
let (isAncestor, ancestorDepth) = lastHead.getDepth(newHead)
|
|
if not(isAncestor):
|
|
notice "Updated head block with chain reorg",
|
|
headParent = shortLog(newHead.parent),
|
|
stateRoot = shortLog(getStateRoot(dag.headState)),
|
|
justified = shortLog(getStateField(
|
|
dag.headState, current_justified_checkpoint)),
|
|
finalized = shortLog(getStateField(dag.headState, finalized_checkpoint))
|
|
|
|
if not(isNil(dag.onReorgHappened)):
|
|
let data = ReorgInfoObject.init(dag.head.slot, uint64(ancestorDepth),
|
|
lastHead.root, newHead.root,
|
|
lastHeadStateRoot,
|
|
getStateRoot(dag.headState))
|
|
dag.onReorgHappened(data)
|
|
|
|
# A reasonable criterion for "reorganizations of the chain"
|
|
quarantine.clearAfterReorg()
|
|
|
|
beacon_reorgs_total_total.inc()
|
|
beacon_reorgs_total.inc()
|
|
else:
|
|
debug "Updated head block",
|
|
stateRoot = shortLog(getStateRoot(dag.headState)),
|
|
justified = shortLog(getStateField(
|
|
dag.headState, current_justified_checkpoint)),
|
|
finalized = shortLog(getStateField(dag.headState, finalized_checkpoint))
|
|
|
|
if not(isNil(dag.onHeadChanged)):
|
|
let
|
|
currentEpoch = epoch(newHead.slot)
|
|
depRoot = withState(dag.headState): state.proposer_dependent_root
|
|
prevDepRoot = withState(dag.headState): state.attester_dependent_root
|
|
epochTransition = (finalizedHead != dag.finalizedHead)
|
|
let data = HeadChangeInfoObject.init(dag.head.slot, dag.head.root,
|
|
getStateRoot(dag.headState),
|
|
epochTransition, depRoot,
|
|
prevDepRoot)
|
|
dag.onHeadChanged(data)
|
|
|
|
withState(dag.headState):
|
|
# Every time the head changes, the "canonical" view of balances and other
|
|
# state-related metrics change - notify the validator monitor.
|
|
# Doing this update during head update ensures there's a reasonable number
|
|
# of such updates happening - at most once per valid block.
|
|
dag.validatorMonitor[].registerState(state.data)
|
|
|
|
if finalizedHead != dag.finalizedHead:
|
|
debug "Reached new finalization checkpoint",
|
|
stateRoot = shortLog(getStateRoot(dag.headState)),
|
|
justified = shortLog(getStateField(
|
|
dag.headState, current_justified_checkpoint)),
|
|
finalized = shortLog(getStateField(dag.headState, finalized_checkpoint))
|
|
|
|
block:
|
|
# Update `dag.finalizedBlocks` with all newly finalized blocks (those
|
|
# newer than the previous finalized head), then update `dag.finalizedHead`
|
|
var newFinalized: seq[BlockId]
|
|
var tmp = finalizedHead.blck
|
|
while not isNil(tmp) and tmp.slot >= dag.finalizedHead.slot:
|
|
newFinalized.add(tmp.bid)
|
|
if tmp != finalizedHead.blck:
|
|
# The newly finalized block itself should remain in here so that fork
|
|
# choice still can find it via root
|
|
dag.forkBlocks.excl(KeyedBlockRef.init(tmp))
|
|
|
|
let p = tmp.parent
|
|
tmp.parent = nil # Reset all parent links to release memory
|
|
tmp = p
|
|
|
|
dag.finalizedHead = finalizedHead
|
|
|
|
dag.db.updateFinalizedBlocks(newFinalized)
|
|
|
|
# Pruning the block dag is required every time the finalized head changes
|
|
# in order to clear out blocks that are no longer viable and should
|
|
# therefore no longer be considered as part of the chain we're following
|
|
dag.pruneBlocksDAG()
|
|
|
|
# Update light client data
|
|
dag.processFinalizationForLightClient()
|
|
|
|
# Send notification about new finalization point via callback.
|
|
if not(isNil(dag.onFinHappened)):
|
|
let stateRoot =
|
|
if dag.finalizedHead.slot == dag.head.slot: getStateRoot(dag.headState)
|
|
elif dag.finalizedHead.slot + SLOTS_PER_HISTORICAL_ROOT > dag.head.slot:
|
|
getStateField(dag.headState, state_roots).data[
|
|
int(dag.finalizedHead.slot mod SLOTS_PER_HISTORICAL_ROOT)]
|
|
else:
|
|
Eth2Digest() # The thing that finalized was >8192 blocks old?
|
|
|
|
let data = FinalizationInfoObject.init(
|
|
dag.finalizedHead.blck.root,
|
|
stateRoot,
|
|
dag.finalizedHead.slot.epoch)
|
|
dag.onFinHappened(dag, data)
|
|
|
|
proc isInitialized*(T: type ChainDAGRef, db: BeaconChainDB): Result[void, cstring] =
|
|
# Lightweight check to see if we have the minimal information needed to
|
|
# load up a database - we don't check head here - if something is wrong with
|
|
# head, it's likely an initialized, but corrupt database - init will detect
|
|
# that
|
|
let
|
|
genesisBlockRoot = db.getGenesisBlock()
|
|
|
|
if not genesisBlockRoot.isSome():
|
|
return err("Genesis block root missing")
|
|
|
|
let
|
|
genesisBlock = db.getForkedBlock(genesisBlockRoot.get())
|
|
if not genesisBlock.isSome():
|
|
return err("Genesis block missing")
|
|
|
|
let
|
|
genesisStateRoot = withBlck(genesisBlock.get()): blck.message.state_root
|
|
|
|
if not db.containsState(genesisStateRoot):
|
|
return err("Genesis state missing")
|
|
|
|
let
|
|
tailBlockRoot = db.getTailBlock()
|
|
if not tailBlockRoot.isSome():
|
|
return err("Tail block root missing")
|
|
|
|
let
|
|
tailBlock = db.getForkedBlock(tailBlockRoot.get())
|
|
if not tailBlock.isSome():
|
|
return err("Tail block missing")
|
|
|
|
let
|
|
tailStateRoot = withBlck(tailBlock.get()): blck.message.state_root
|
|
|
|
if not db.containsState(tailStateRoot):
|
|
return err("Tail state missing")
|
|
|
|
ok()
|
|
|
|
proc preInit*(
|
|
T: type ChainDAGRef, db: BeaconChainDB,
|
|
genesisState, tailState: ForkedHashedBeaconState,
|
|
tailBlock: ForkedTrustedSignedBeaconBlock) =
|
|
# write a genesis state, the way the ChainDAGRef expects it to be stored in
|
|
# database
|
|
|
|
logScope:
|
|
genesisStateRoot = getStateRoot(genesisState)
|
|
genesisStateSlot = getStateField(genesisState, slot)
|
|
tailStateRoot = getStateRoot(tailState)
|
|
tailStateSlot = getStateField(tailState, slot)
|
|
|
|
let genesisBlockRoot = withState(genesisState):
|
|
if state.root != getStateRoot(tailState):
|
|
# Different tail and genesis
|
|
if state.data.slot >= getStateField(tailState, slot):
|
|
fatal "Tail state must be newer or the same as genesis state"
|
|
quit 1
|
|
|
|
let tail_genesis_validators_root =
|
|
getStateField(tailState, genesis_validators_root)
|
|
if state.data.genesis_validators_root != tail_genesis_validators_root:
|
|
fatal "Tail state doesn't match genesis validators root, it is likely from a different network!",
|
|
genesis_validators_root = shortLog(state.data.genesis_validators_root),
|
|
tail_genesis_validators_root = shortLog(tail_genesis_validators_root)
|
|
quit 1
|
|
|
|
let blck = get_initial_beacon_block(state)
|
|
db.putBlock(blck)
|
|
db.putState(state)
|
|
|
|
db.putGenesisBlock(blck.root)
|
|
|
|
blck.root
|
|
else: # tail and genesis are the same
|
|
withBlck(tailBlock):
|
|
db.putGenesisBlock(blck.root)
|
|
blck.root
|
|
|
|
withState(tailState):
|
|
withBlck(tailBlock):
|
|
# When looking up the state root of the tail block, we don't use the
|
|
# BlockSlot->state_root map, so the only way the init code can find the
|
|
# state is through the state root in the block - this could be relaxed
|
|
# down the line
|
|
if blck.message.state_root != state.root:
|
|
fatal "State must match the given block",
|
|
tailBlck = shortLog(blck)
|
|
|
|
quit 1
|
|
|
|
db.putBlock(blck)
|
|
db.putState(state)
|
|
|
|
db.putTailBlock(blck.root)
|
|
db.putHeadBlock(blck.root)
|
|
|
|
notice "New database from snapshot",
|
|
genesisBlockRoot = shortLog(genesisBlockRoot),
|
|
genesisStateRoot = shortLog(getStateRoot(genesisState)),
|
|
tailBlockRoot = shortLog(blck.root),
|
|
tailStateRoot = shortLog(state.root),
|
|
fork = state.data.fork,
|
|
validators = state.data.validators.len()
|
|
|
|
proc getProposer*(
|
|
dag: ChainDAGRef, head: BlockRef, slot: Slot): Option[ValidatorIndex] =
|
|
let
|
|
epochRef = block:
|
|
let tmp = dag.getEpochRef(head.bid, slot.epoch(), false)
|
|
if tmp.isErr():
|
|
return none(ValidatorIndex)
|
|
tmp.get()
|
|
slotInEpoch = slot.since_epoch_start()
|
|
|
|
let proposer = epochRef.beacon_proposers[slotInEpoch]
|
|
if proposer.isSome():
|
|
if proposer.get().uint64 >= dag.db.immutableValidators.lenu64():
|
|
# Sanity check - it should never happen that the key cache doesn't contain
|
|
# a key for the selected proposer - that would mean that we somehow
|
|
# created validators in the state without updating the cache!
|
|
warn "Proposer key not found",
|
|
keys = dag.db.immutableValidators.lenu64(), proposer = proposer.get()
|
|
return none(ValidatorIndex)
|
|
|
|
proposer
|
|
|
|
proc aggregateAll*(
|
|
dag: ChainDAGRef,
|
|
validator_indices: openArray[ValidatorIndex]): Result[CookedPubKey, cstring] =
|
|
if validator_indices.len == 0:
|
|
# Aggregation spec requires non-empty collection
|
|
# - https://tools.ietf.org/html/draft-irtf-cfrg-bls-signature-04
|
|
# Eth2 spec requires at least one attesting index in attestation
|
|
# - https://github.com/ethereum/consensus-specs/blob/v1.1.10/specs/phase0/beacon-chain.md#is_valid_indexed_attestation
|
|
return err("aggregate: no attesting keys")
|
|
|
|
let
|
|
firstKey = dag.validatorKey(validator_indices[0])
|
|
|
|
if not firstKey.isSome():
|
|
return err("aggregate: invalid validator index")
|
|
|
|
var aggregateKey{.noinit.}: AggregatePublicKey
|
|
|
|
aggregateKey.init(firstKey.get())
|
|
|
|
for i in 1 ..< validator_indices.len:
|
|
let key = dag.validatorKey(validator_indices[i])
|
|
if not key.isSome():
|
|
return err("aggregate: invalid validator index")
|
|
aggregateKey.aggregate(key.get())
|
|
|
|
ok(finish(aggregateKey))
|
|
|
|
proc aggregateAll*(
|
|
dag: ChainDAGRef,
|
|
validator_indices: openArray[ValidatorIndex|uint64],
|
|
bits: BitSeq | BitArray): Result[CookedPubKey, cstring] =
|
|
if validator_indices.len() != bits.len():
|
|
return err("aggregateAll: mismatch in bits length")
|
|
|
|
var
|
|
aggregateKey{.noinit.}: AggregatePublicKey
|
|
inited = false
|
|
|
|
for i in 0..<bits.len():
|
|
if bits[i]:
|
|
let key = dag.validatorKey(validator_indices[i])
|
|
if not key.isSome():
|
|
return err("aggregate: invalid validator index")
|
|
|
|
if inited:
|
|
aggregateKey.aggregate(key.get)
|
|
else:
|
|
aggregateKey = AggregatePublicKey.init(key.get)
|
|
inited = true
|
|
|
|
if not inited:
|
|
err("aggregate: no attesting keys")
|
|
else:
|
|
ok(finish(aggregateKey))
|
|
|
|
func needsBackfill*(dag: ChainDAGRef): bool =
|
|
dag.backfill.slot > dag.genesis.slot
|
|
|
|
proc rebuildIndex*(dag: ChainDAGRef) =
|
|
## After a checkpoint sync, we lack intermediate states to replay from - this
|
|
## function rebuilds them so that historical replay can take place again
|
|
if dag.backfill.slot > 0:
|
|
debug "Backfill not complete, cannot rebuild archive"
|
|
return
|
|
|
|
if dag.tail.slot == dag.genesis.slot:
|
|
# The tail is the earliest slot for which we're supposed to have states -
|
|
# if it's sufficiently recent, don't do anything
|
|
debug "Archive does not need rebuilding"
|
|
return
|
|
|
|
# First, we check what states we already have in the database - that allows
|
|
# resuming the operation at any time
|
|
let
|
|
roots = dag.db.loadStateRoots()
|
|
|
|
var
|
|
canonical = newSeq[Eth2Digest](
|
|
(dag.finalizedHead.slot.epoch + EPOCHS_PER_STATE_SNAPSHOT - 1) div
|
|
EPOCHS_PER_STATE_SNAPSHOT)
|
|
# `junk` puts in place some infrastructure to prune unnecessary states - it
|
|
# will be more useful in the future as a base for pruning
|
|
junk: seq[((Slot, Eth2Digest), Eth2Digest)]
|
|
|
|
for k, v in roots:
|
|
if k[0] >= dag.finalizedHead.slot:
|
|
continue # skip newer stuff
|
|
|
|
if not isFinalizedStateSnapshot(k[0]):
|
|
# `tail` will move at the end of the process, so we won't need any
|
|
# intermediate states
|
|
junk.add((k, v))
|
|
|
|
continue # skip non-snapshot slots
|
|
|
|
if k[0] > 0:
|
|
let bs = dag.getBlockIdAtSlot(k[0] - 1)
|
|
if bs.isNone or bs.get().bid.root != k[1]:
|
|
# remove things that are no longer a canonical part of the chain or
|
|
# cannot be reached via a block
|
|
junk.add((k, v))
|
|
continue
|
|
|
|
if not dag.db.containsState(v):
|
|
continue # If it's not in the database..
|
|
|
|
canonical[k[0].epoch div EPOCHS_PER_STATE_SNAPSHOT] = v
|
|
|
|
let
|
|
state = (ref ForkedHashedBeaconState)()
|
|
|
|
var
|
|
cache: StateCache
|
|
info: ForkedEpochInfo
|
|
|
|
# `canonical` holds all slots at which a state is expected to appear, using a
|
|
# zero root whenever a particular state is missing - this way, if there's
|
|
# partial progress or gaps, they will be dealt with correctly
|
|
for i, state_root in canonical.mpairs():
|
|
if not state_root.isZero:
|
|
continue
|
|
|
|
doAssert i > 0, "Genesis should always be available"
|
|
|
|
let
|
|
startSlot = Epoch((i - 1) * EPOCHS_PER_STATE_SNAPSHOT).start_slot
|
|
slot = Epoch(i * EPOCHS_PER_STATE_SNAPSHOT).start_slot
|
|
|
|
info "Recreating state snapshot",
|
|
slot, startStateRoot = canonical[i - 1], startSlot
|
|
|
|
if getStateRoot(state[]) != canonical[i - 1]:
|
|
if not dag.db.getState(dag.cfg.stateForkAtEpoch(startSlot.epoch), canonical[i - 1], state[], noRollback):
|
|
error "Can't load start state, database corrupt?",
|
|
startStateRoot = shortLog(canonical[i - 1]), slot = startSlot
|
|
return
|
|
|
|
for slot in startSlot..<startSlot + (EPOCHS_PER_STATE_SNAPSHOT * SLOTS_PER_EPOCH):
|
|
let bids = dag.getBlockIdAtSlot(slot).valueOr:
|
|
warn "Block id missing, cannot continue - database corrupt?", slot
|
|
return
|
|
|
|
# The slot check is needed to avoid re-applying a block
|
|
if bids.isProposed and getStateField(state[], latest_block_header).slot < bids.bid.slot:
|
|
let res = dag.applyBlock(state[], bids.bid, cache, info)
|
|
if res.isErr:
|
|
error "Failed to apply block while ", bids, slot
|
|
return
|
|
|
|
if slot.is_epoch:
|
|
cache.prune(slot.epoch)
|
|
|
|
process_slots(
|
|
dag.cfg, state[], slot, cache, info,
|
|
dag.updateFlags).expect("process_slots shouldn't fail when state slot is correct")
|
|
|
|
withState(state[]):
|
|
dag.db.putState(state)
|
|
dag.db.checkpoint()
|
|
|
|
state_root = state.root
|
|
|
|
# Now that we have states all the way to genesis, we can adjust the tail
|
|
# and readjust the in-memory indices to what they would look like if we had
|
|
# started with an earlier tail
|
|
dag.db.putTailBlock(dag.genesis.root)
|
|
|
|
dag.tail = dag.genesis
|
|
|
|
if junk.len > 0:
|
|
info "Dropping redundant states", states = junk.len
|
|
|
|
for i in junk:
|
|
dag.db.delState(i[1])
|