1667 lines
62 KiB
Nim
1667 lines
62 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/[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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../spec/datatypes/[phase0, altair, merge],
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".."/beacon_chain_db,
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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 updateStateData*(
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dag: ChainDAGRef, state: var StateData, bs: BlockSlot, save: bool,
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cache: var StateCache): bool {.gcsafe.}
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template withStateVars*(
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stateDataInternal: var StateData, 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 stateData(): StateData {.inject, used.} = stateDataInternal
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template stateRoot(): Eth2Digest {.inject, used.} =
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getStateRoot(stateDataInternal.data)
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template blck(): BlockRef {.inject, used.} = stateDataInternal.blck
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template root(): Eth2Digest {.inject, used.} = stateDataInternal.data.root
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body
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template withUpdatedState*(
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dag: ChainDAGRef, stateData: var StateData, blockSlot: BlockSlot,
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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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var cache {.inject.} = StateCache()
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if updateStateData(dag, stateData, blockSlot, false, cache):
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withStateVars(stateData):
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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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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: StateData,
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cache: var StateCache): T =
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let
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epoch = state.data.get_current_epoch()
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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: state.blck.epochAncestor(epoch),
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eth1_data: getStateField(state.data, eth1_data),
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eth1_deposit_index: getStateField(state.data, eth1_deposit_index),
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current_justified_checkpoint:
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getStateField(state.data, current_justified_checkpoint),
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finalized_checkpoint: getStateField(state.data, finalized_checkpoint),
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shuffled_active_validator_indices:
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cache.get_shuffled_active_validator_indices(state.data, epoch),
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merge_transition_complete:
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case state.data.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.data.mergeData.data.latest_execution_payload_header !=
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ExecutionPayloadHeader()
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)
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epochStart = epoch.compute_start_slot_at_epoch()
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doAssert epochRef.key.blck != nil, "epochAncestor should not fail for state block"
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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.data, 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](get_effective_balances(
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getStateField(state.data, validators).asSeq,
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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 getBlockBySlot*(dag: ChainDAGRef, slot: Slot): BlockSlot =
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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 - see
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## getBlockSlotIdBySlot for a version that covers backfill blocks as well
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## May return an empty BlockSlot (where blck is nil!)
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if slot == dag.genesis.slot:
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# There may be gaps in the
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return dag.genesis.atSlot(slot)
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if slot > dag.finalizedHead.slot:
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return dag.head.atSlot(slot) # Linear iteration is the fastest we have
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doAssert dag.finalizedHead.slot >= dag.tail.slot
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doAssert dag.tail.slot >= dag.backfill.slot
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doAssert dag.finalizedBlocks.len ==
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(dag.finalizedHead.slot - dag.tail.slot).int + 1, "see updateHead"
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if slot >= dag.tail.slot:
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var pos = int(slot - dag.tail.slot)
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while true:
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if dag.finalizedBlocks[pos] != nil:
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return dag.finalizedBlocks[pos].atSlot(slot)
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if pos == 0:
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break
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pos -= 1
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if dag.tail.slot == 0:
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raiseAssert "Genesis missing"
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BlockSlot() # nil blck!
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func getBlockSlotIdBySlot*(dag: ChainDAGRef, slot: Slot): 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
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if slot == dag.genesis.slot:
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return dag.genesis.bid.atSlot(slot)
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if slot >= dag.tail.slot:
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return dag.getBlockBySlot(slot).toBlockSlotId()
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var pos = slot.int
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while pos >= dag.backfill.slot.int:
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if dag.backfillBlocks[pos] != Eth2Digest():
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return BlockId(root: dag.backfillBlocks[pos], slot: Slot(pos)).atSlot(slot)
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pos -= 1
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BlockSlotId() # not backfilled yet, and not genesis
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func epochAncestor*(blck: BlockRef, 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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var blck = blck
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while blck.slot.epoch >= epoch and not blck.parent.isNil:
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blck = blck.parent
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if blck.slot.epoch > epoch:
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EpochKey() # The searched-for epoch predates our tail block
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else:
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EpochKey(epoch: epoch, blck: blck)
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func findEpochRef*(
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dag: ChainDAGRef, blck: BlockRef, epoch: Epoch): Opt[EpochRef] =
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# Look for an existing EpochRef in the cache
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let ancestor = epochAncestor(blck, epoch)
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if isNil(ancestor.blck):
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# We can't compute EpochRef instances for states before the tail because
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# we do not have them!
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return err()
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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, blck: BlockRef, 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(blck, 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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for i, idx in epochRef[].beacon_proposers:
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cache.beacon_proposer_indices[
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epoch.compute_start_slot_at_epoch + 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 contains*(dag: ChainDAGRef, root: Eth2Digest): bool =
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KeyedBlockRef.asLookupKey(root) in dag.blocks
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proc containsBlock(
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cfg: RuntimeConfig, db: BeaconChainDB, slot: Slot, root: Eth2Digest): bool =
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case cfg.blockForkAtEpoch(slot.epoch)
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of BeaconBlockFork.Phase0: db.containsBlockPhase0(root)
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of BeaconBlockFork.Altair: db.containsBlockAltair(root)
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of BeaconBlockFork.Bellatrix: db.containsBlockMerge(root)
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func isStateCheckpoint(bs: BlockSlot): 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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(bs.slot == bs.blck.slot and bs.blck.parent == nil) or
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(bs.slot.isEpoch and bs.slot.epoch == (bs.blck.slot.epoch + 1))
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proc getStateData(
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db: BeaconChainDB, cfg: RuntimeConfig, state: var StateData, bs: BlockSlot,
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rollback: RollbackProc): bool =
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if not bs.isStateCheckpoint():
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return false
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let root = db.getStateRoot(bs.blck.root, bs.slot)
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if not root.isSome():
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return false
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let expectedFork = cfg.stateForkAtEpoch(bs.slot.epoch)
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if state.data.kind != expectedFork:
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state.data = (ref ForkedHashedBeaconState)(kind: expectedFork)[]
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case expectedFork
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of BeaconStateFork.Bellatrix:
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if not db.getState(root.get(), state.data.mergeData.data, rollback):
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return false
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of BeaconStateFork.Altair:
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if not db.getState(root.get(), state.data.altairData.data, rollback):
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return false
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of BeaconStateFork.Phase0:
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if not db.getState(root.get(), state.data.phase0Data.data, rollback):
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return false
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state.blck = bs.blck
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setStateRoot(state.data, root.get())
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true
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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.getMergeBlock(root); blck.isSome()):
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ok(ForkedTrustedSignedBeaconBlock.init(blck.get()))
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elif (let blck = db.getAltairBlock(root); blck.isSome()):
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ok(ForkedTrustedSignedBeaconBlock.init(blck.get()))
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elif (let blck = db.getPhase0Block(root); blck.isSome()):
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ok(ForkedTrustedSignedBeaconBlock.init(blck.get()))
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else:
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err()
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proc init*(T: type ChainDAGRef, cfg: RuntimeConfig, db: BeaconChainDB,
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validatorMonitor: ref ValidatorMonitor, updateFlags: UpdateFlags,
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onBlockCb: OnBlockCallback = nil, onHeadCb: OnHeadCallback = nil,
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onReorgCb: OnReorgCallback = nil,
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onFinCb: OnFinalizedCallback = nil): ChainDAGRef =
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# TODO we require that the db contains both a head and a tail block -
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# asserting here doesn't seem like the right way to go about it however..
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let
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tailBlockRoot = db.getTailBlock()
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headBlockRoot = db.getHeadBlock()
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doAssert tailBlockRoot.isSome(), "Missing tail block, database corrupt?"
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doAssert headBlockRoot.isSome(), "Missing head block, database corrupt?"
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let
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tailRoot = tailBlockRoot.get()
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tailBlock = db.getForkedBlock(tailRoot).get()
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tailRef = withBlck(tailBlock): BlockRef.init(tailRoot, blck.message)
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headRoot = headBlockRoot.get()
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let genesisRef = if tailBlock.slot == GENESIS_SLOT:
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tailRef
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else:
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let
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genesisBlockRoot = db.getGenesisBlock().expect(
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"preInit should have initialized the database with a genesis block root")
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genesisBlock = db.getForkedBlock(genesisBlockRoot).expect(
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"preInit should have initialized the database with a genesis block")
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withBlck(genesisBlock): BlockRef.init(genesisBlockRoot, blck.message)
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var
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blocks: HashSet[KeyedBlockRef]
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headRef: BlockRef
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blocks.incl(KeyedBlockRef.init(tailRef))
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if genesisRef != tailRef:
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blocks.incl(KeyedBlockRef.init(genesisRef))
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var
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backfillBlocks = newSeq[Eth2Digest](tailRef.slot.int)
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curRef: BlockRef
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backfill = BeaconBlockSummary(slot: GENESIS_SLOT)
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for blck in db.getAncestorSummaries(headRoot):
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if blck.summary.slot < tailRef.slot:
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backfillBlocks[blck.summary.slot.int] = blck.root
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backfill = blck.summary
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elif blck.summary.slot == tailRef.slot:
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backfill = blck.summary
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if curRef == nil:
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curRef = tailRef
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headRef = tailRef
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else:
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link(tailRef, curRef)
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curRef = curRef.parent
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else:
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if curRef == nil:
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# When the database has been written with a pre-fork version of the
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# software, it may happen that blocks produced using an "unforked"
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# chain get written to the database - we need to skip such blocks
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# when loading the database with a fork-compatible version
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if not containsBlock(cfg, db, blck.summary.slot, blck.root):
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continue
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let newRef = BlockRef.init(blck.root, blck.summary.slot)
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if curRef == nil:
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curRef = newRef
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headRef = newRef
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else:
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link(newRef, curRef)
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curRef = curRef.parent
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blocks.incl(KeyedBlockRef.init(curRef))
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trace "Populating block dag", key = curRef.root, val = curRef
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if curRef != tailRef:
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fatal "Head block does not lead to tail - database corrupt?",
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genesisRef, tailRef, headRef, curRef, tailRoot, headRoot,
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blocks = blocks.len()
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quit 1
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|
|
# Because of incorrect hardfork check, there might be no head block, in which
|
|
# case it's equivalent to the tail block
|
|
if headRef == nil:
|
|
headRef = tailRef
|
|
|
|
var
|
|
cur = headRef.atSlot()
|
|
tmpState = (ref StateData)()
|
|
|
|
# Now that we have a head block, we need to find the most recent state that
|
|
# we have saved in the database
|
|
while cur.blck != nil and
|
|
not getStateData(db, cfg, tmpState[], cur, noRollback):
|
|
cur = cur.parentOrSlot()
|
|
|
|
if tmpState.blck == nil:
|
|
fatal "No state found in head history, database corrupt?",
|
|
genesisRef, tailRef, headRef, tailRoot, headRoot,
|
|
blocks = blocks.len()
|
|
# TODO Potentially we could recover from here instead of crashing - what
|
|
# would be a good recovery model?
|
|
quit 1
|
|
|
|
case tmpState.data.kind
|
|
of BeaconStateFork.Phase0:
|
|
if tmpState.data.phase0Data.data.fork != genesisFork(cfg):
|
|
error "State from database does not match network, check --network parameter",
|
|
genesisRef, tailRef, headRef, tailRoot, headRoot,
|
|
blocks = blocks.len(),
|
|
stateFork = tmpState.data.phase0Data.data.fork,
|
|
configFork = genesisFork(cfg)
|
|
quit 1
|
|
of BeaconStateFork.Altair:
|
|
if tmpState.data.altairData.data.fork != altairFork(cfg):
|
|
error "State from database does not match network, check --network parameter",
|
|
genesisRef, tailRef, headRef, tailRoot, headRoot,
|
|
blocks = blocks.len(),
|
|
stateFork = tmpState.data.altairData.data.fork,
|
|
configFork = altairFork(cfg)
|
|
quit 1
|
|
of BeaconStateFork.Bellatrix:
|
|
if tmpState.data.mergeData.data.fork != mergeFork(cfg):
|
|
error "State from database does not match network, check --network parameter",
|
|
genesisRef, tailRef, headRef, tailRoot, headRoot,
|
|
blocks = blocks.len(),
|
|
stateFork = tmpState.data.mergeData.data.fork,
|
|
configFork = mergeFork(cfg)
|
|
quit 1
|
|
|
|
let dag = ChainDAGRef(
|
|
db: db,
|
|
validatorMonitor: validatorMonitor,
|
|
blocks: blocks,
|
|
backfillBlocks: backfillBlocks,
|
|
genesis: genesisRef,
|
|
tail: tailRef,
|
|
backfill: backfill,
|
|
finalizedHead: tailRef.atSlot(),
|
|
lastPrunePoint: tailRef.atSlot(),
|
|
# Tail is implicitly finalized - we'll adjust it below when computing the
|
|
# head state
|
|
heads: @[headRef],
|
|
headState: tmpState[],
|
|
epochRefState: tmpState[],
|
|
clearanceState: tmpState[],
|
|
|
|
# The only allowed flag right now is verifyFinalization, as the others all
|
|
# allow skipping some validation.
|
|
updateFlags: {verifyFinalization} * updateFlags,
|
|
cfg: cfg,
|
|
|
|
forkDigests: newClone ForkDigests.init(
|
|
cfg,
|
|
getStateField(tmpState.data, genesis_validators_root)),
|
|
|
|
onBlockAdded: onBlockCb,
|
|
onHeadChanged: onHeadCb,
|
|
onReorgHappened: onReorgCb,
|
|
onFinHappened: onFinCb
|
|
)
|
|
|
|
let forkVersions =
|
|
[cfg.GENESIS_FORK_VERSION, cfg.ALTAIR_FORK_VERSION, cfg.MERGE_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.MERGE_FORK_EPOCH
|
|
doAssert cfg.MERGE_FORK_EPOCH <= cfg.SHARDING_FORK_EPOCH
|
|
doAssert dag.updateFlags in [{}, {verifyFinalization}]
|
|
|
|
var cache: StateCache
|
|
if not dag.updateStateData(dag.headState, headRef.atSlot(), false, cache):
|
|
fatal "Unable to load head state, database corrupt?",
|
|
head = shortLog(headRef)
|
|
|
|
quit 1
|
|
|
|
# The tail block is "implicitly" finalized as it was given either as a
|
|
# checkpoint block, or is the genesis, thus we use it as a lower bound when
|
|
# computing the finalized head
|
|
let
|
|
finalized_checkpoint =
|
|
getStateField(dag.headState.data, finalized_checkpoint)
|
|
finalizedSlot = max(
|
|
finalized_checkpoint.epoch.compute_start_slot_at_epoch(), tailRef.slot)
|
|
|
|
dag.finalizedHead = headRef.atSlot(finalizedSlot)
|
|
|
|
block:
|
|
dag.finalizedBlocks.setLen((dag.finalizedHead.slot - dag.tail.slot).int + 1)
|
|
|
|
var tmp = dag.finalizedHead.blck
|
|
while not isNil(tmp):
|
|
dag.finalizedBlocks[(tmp.slot - dag.tail.slot).int] = tmp
|
|
tmp = tmp.parent
|
|
|
|
dag.clearanceState = dag.headState
|
|
|
|
# Pruning metadata
|
|
dag.lastPrunePoint = dag.finalizedHead
|
|
|
|
# Fill validator key cache in case we're loading an old database that doesn't
|
|
# have a cache
|
|
dag.updateValidatorKeys(getStateField(dag.headState.data, validators).asSeq())
|
|
|
|
withState(dag.headState.data):
|
|
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),
|
|
totalBlocks = dag.blocks.len(),
|
|
backfill = (dag.backfill.slot, shortLog(dag.backfill.parent_root))
|
|
|
|
dag
|
|
|
|
template genesisValidatorsRoot*(dag: ChainDAGRef): Eth2Digest =
|
|
getStateField(dag.headState.data, genesis_validators_root)
|
|
|
|
func getEpochRef*(
|
|
dag: ChainDAGRef, state: StateData, cache: var StateCache): EpochRef =
|
|
## Get a cached `EpochRef` or construct one based on the given state - always
|
|
## returns an EpochRef instance
|
|
let
|
|
blck = state.blck
|
|
epoch = state.data.get_current_epoch()
|
|
|
|
var epochRef = dag.findEpochRef(blck, 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, blck: BlockRef, 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()
|
|
|
|
let epochRef = dag.findEpochRef(blck, epoch)
|
|
if epochRef.isOk():
|
|
beacon_state_data_cache_hits.inc
|
|
return epochRef
|
|
|
|
beacon_state_data_cache_misses.inc
|
|
|
|
let
|
|
ancestor = epochAncestor(blck, epoch)
|
|
if isNil(ancestor.blck): # past the tail
|
|
return err()
|
|
|
|
dag.withUpdatedState(
|
|
dag.epochRefState, ancestor.blck.atEpochStart(ancestor.epoch)) do:
|
|
ok(dag.getEpochRef(stateData, cache))
|
|
do:
|
|
err()
|
|
|
|
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*(bs: BlockSlot): BlockSlot =
|
|
## The first ancestor BlockSlot that is a state checkpoint
|
|
var bs = bs
|
|
while not isStateCheckPoint(bs):
|
|
bs = bs.parentOrSlot
|
|
bs
|
|
|
|
template forkAtEpoch*(dag: ChainDAGRef, epoch: Epoch): Fork =
|
|
forkAtEpoch(dag.cfg, epoch)
|
|
|
|
proc 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 getState(dag: ChainDAGRef, state: var StateData, bs: BlockSlot): bool =
|
|
## Load a state from the database given a block and a slot - this will first
|
|
## lookup the state root in the state root table then load the corresponding
|
|
## state, if it exists
|
|
if not bs.isStateCheckpoint():
|
|
return false # Only state checkpoints are stored - no need to hit DB
|
|
|
|
let stateRoot = dag.db.getStateRoot(bs.blck.root, bs.slot)
|
|
if stateRoot.isNone(): return false
|
|
|
|
let restoreAddr =
|
|
# Any restore point will do as long as it's not the object being updated
|
|
if unsafeAddr(state) == unsafeAddr(dag.headState):
|
|
unsafeAddr dag.clearanceState
|
|
else:
|
|
unsafeAddr dag.headState
|
|
|
|
let v = addr state.data
|
|
func restore() =
|
|
assign(v[], restoreAddr[].data)
|
|
|
|
getStateData(dag.db, dag.cfg, state, bs, restore)
|
|
|
|
proc putState(dag: ChainDAGRef, state: StateData) =
|
|
# Store a state and its root
|
|
logScope:
|
|
blck = shortLog(state.blck)
|
|
stateSlot = shortLog(getStateField(state.data, slot))
|
|
stateRoot = shortLog(getStateRoot(state.data))
|
|
|
|
if not isStateCheckpoint(state.blck.atSlot(getStateField(state.data, slot))):
|
|
return
|
|
|
|
# Don't consider legacy tables here, they are slow to read so we'll want to
|
|
# rewrite things in the new database anyway.
|
|
if dag.db.containsState(getStateRoot(state.data), 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.data):
|
|
dag.db.putStateRoot(state.latest_block_root(), state.data.slot, state.root)
|
|
dag.db.putState(state.root, state.data)
|
|
|
|
debug "Stored state", putStateDur = Moment.now() - startTick
|
|
|
|
func getRef*(dag: ChainDAGRef, root: Eth2Digest): BlockRef =
|
|
## Retrieve a resolved block reference, if available
|
|
let key = KeyedBlockRef.asLookupKey(root)
|
|
# HashSet lacks the api to do check-and-get in one lookup - `[]` will return
|
|
# the copy of the instance in the set which has more fields than `root` set!
|
|
if key in dag.blocks:
|
|
try: dag.blocks[key].blockRef()
|
|
except KeyError: raiseAssert "contains"
|
|
else:
|
|
nil
|
|
|
|
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.getBlockSlotIdBySlot(curSlot)
|
|
if bs.isProposed():
|
|
o -= 1
|
|
output[o] = bs.bid
|
|
curSlot -= skipStep
|
|
|
|
# Handle start slot separately (to avoid underflow when computing curSlot)
|
|
let bs = dag.getBlockSlotIdBySlot(startSlot)
|
|
if bs.isProposed():
|
|
o -= 1
|
|
output[o] = bs.bid
|
|
|
|
o # Return the index of the first non-nil item in the output
|
|
|
|
proc getForkedBlock*(dag: ChainDAGRef, id: BlockId): Opt[ForkedTrustedSignedBeaconBlock] =
|
|
case dag.cfg.blockForkAtEpoch(id.slot.epoch)
|
|
of BeaconBlockFork.Phase0:
|
|
let data = dag.db.getPhase0Block(id.root)
|
|
if data.isOk():
|
|
return ok ForkedTrustedSignedBeaconBlock.init(data.get)
|
|
of BeaconBlockFork.Altair:
|
|
let data = dag.db.getAltairBlock(id.root)
|
|
if data.isOk():
|
|
return ok ForkedTrustedSignedBeaconBlock.init(data.get)
|
|
of BeaconBlockFork.Bellatrix:
|
|
let data = dag.db.getMergeBlock(id.root)
|
|
if data.isOk():
|
|
return ok ForkedTrustedSignedBeaconBlock.init(data.get)
|
|
|
|
proc getForkedBlock*(dag: ChainDAGRef, blck: BlockRef): ForkedTrustedSignedBeaconBlock =
|
|
let blck = dag.getForkedBlock(blck.bid)
|
|
if blck.isSome():
|
|
return blck.get()
|
|
|
|
proc get*(dag: ChainDAGRef, blck: BlockRef): BlockData =
|
|
## Retrieve the associated block body of a block reference
|
|
doAssert (not blck.isNil), "Trying to get nil BlockRef"
|
|
|
|
BlockData(data: dag.getForkedBlock(blck), refs: blck)
|
|
|
|
proc get*(dag: ChainDAGRef, root: Eth2Digest): Option[BlockData] =
|
|
## Retrieve a resolved block reference and its associated body, if available
|
|
let refs = dag.getRef(root)
|
|
|
|
if not refs.isNil:
|
|
some(dag.get(refs))
|
|
else:
|
|
none(BlockData)
|
|
|
|
proc advanceSlots(
|
|
dag: ChainDAGRef, state: var StateData, 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 positions at a slot before or equal to the
|
|
# target
|
|
doAssert getStateField(state.data, slot) <= slot
|
|
|
|
while getStateField(state.data, slot) < slot:
|
|
let preEpoch = getStateField(state.data, slot).epoch
|
|
loadStateCache(dag, cache, state.blck, getStateField(state.data, slot).epoch)
|
|
|
|
doAssert process_slots(
|
|
dag.cfg, state.data, getStateField(state.data, slot) + 1, cache, info,
|
|
dag.updateFlags),
|
|
"process_slots shouldn't fail when state slot is correct"
|
|
if save:
|
|
dag.putState(state)
|
|
|
|
# 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.data):
|
|
let postEpoch = state.data.slot.epoch
|
|
if preEpoch != postEpoch:
|
|
dag.validatorMonitor[].registerEpochInfo(postEpoch, info, state.data)
|
|
|
|
proc applyBlock(
|
|
dag: ChainDAGRef,
|
|
state: var StateData, blck: BlockData, flags: UpdateFlags,
|
|
cache: var StateCache, info: var ForkedEpochInfo): bool =
|
|
# Apply a single block to the state - the state must be positioned at the
|
|
# parent of the block with a slot lower than the one of the block being
|
|
# applied
|
|
doAssert state.blck == blck.refs.parent
|
|
|
|
var statePtr = unsafeAddr state # safe because `restore` is locally scoped
|
|
func restore(v: var ForkedHashedBeaconState) =
|
|
doAssert (addr(statePtr.data) == addr v)
|
|
assign(statePtr[], dag.headState)
|
|
|
|
loadStateCache(dag, cache, state.blck, getStateField(state.data, slot).epoch)
|
|
|
|
let ok = withBlck(blck.data):
|
|
state_transition(
|
|
dag.cfg, state.data, blck, cache, info,
|
|
flags + dag.updateFlags + {slotProcessed}, restore)
|
|
if ok:
|
|
state.blck = blck.refs
|
|
|
|
ok
|
|
|
|
proc updateStateData*(
|
|
dag: ChainDAGRef, state: var StateData, bs: BlockSlot, 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`, `updateStateData` 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
|
|
|
|
if isNil(bs.blck):
|
|
info "Requesting state for unknown block, historical data not available?",
|
|
head = shortLog(dag.head), tail = shortLog(dag.tail)
|
|
|
|
return false
|
|
|
|
let
|
|
startTick = Moment.now()
|
|
current {.used.} = state.blck.atSlot(getStateField(state.data, slot))
|
|
|
|
var
|
|
ancestors: seq[BlockRef]
|
|
found = false
|
|
|
|
template exactMatch(state: StateData, bs: BlockSlot): 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.blck == bs.blck and getStateField(state.data, slot) == bs.slot
|
|
|
|
template canAdvance(state: StateData, bs: BlockSlot): 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.blck == bs.blck and getStateField(state.data, slot) <= bs.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, bs):
|
|
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, bs):
|
|
assign(state, dag.headState)
|
|
found = true
|
|
elif exactMatch(dag.clearanceState, bs):
|
|
assign(state, dag.clearanceState)
|
|
found = true
|
|
elif exactMatch(dag.epochRefState, bs):
|
|
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 = bs
|
|
while ancestors.len < RewindBlockThreshold:
|
|
if isNil(cur.blck): # 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.blck)
|
|
|
|
# Move slot by slot to capture epoch boundary states
|
|
cur = cur.parentOrSlot()
|
|
|
|
if not found:
|
|
debug "UpdateStateData cache miss",
|
|
current = shortLog(current), target = shortLog(bs)
|
|
|
|
# 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 = bs
|
|
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 = bs.slot.epoch
|
|
while not canAdvance(state, cur) and not dag.getState(state, cur):
|
|
# 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.blck)
|
|
|
|
if cur.slot == dag.tail.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(bs), tail = shortLog(dag.tail), cur = shortLog(cur)
|
|
return false
|
|
|
|
# Move slot by slot to capture epoch boundary states
|
|
cur = cur.parentOrSlot()
|
|
|
|
beacon_state_rewinds.inc()
|
|
|
|
# Starting state has been assigned, either from memory or database
|
|
let
|
|
assignTick = Moment.now()
|
|
ancestor {.used.} = state.blck.atSlot(getStateField(state.data, slot))
|
|
ancestorRoot {.used.} = getStateRoot(state.data)
|
|
|
|
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.
|
|
let ok =
|
|
dag.applyBlock(state, dag.get(ancestors[i]), {}, cache, info)
|
|
doAssert ok, "Blocks in database should never fail to apply.."
|
|
|
|
# ...and make sure to process empty slots as requested
|
|
dag.advanceSlots(state, bs.slot, save, cache, info)
|
|
|
|
# ...and make sure to load the state cache, if it exists
|
|
loadStateCache(dag, cache, state.blck, getStateField(state.data, 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.data, slot) - ancestor.slot,
|
|
current = shortLog(current),
|
|
ancestor = shortLog(ancestor),
|
|
target = shortLog(bs),
|
|
ancestorStateRoot = shortLog(ancestorRoot),
|
|
targetStateRoot = shortLog(getStateRoot(state.data)),
|
|
found,
|
|
assignDur,
|
|
replayDur
|
|
|
|
elif ancestors.len > 0:
|
|
debug "State replayed",
|
|
blocks = ancestors.len,
|
|
slots = getStateField(state.data, slot) - ancestor.slot,
|
|
current = shortLog(current),
|
|
ancestor = shortLog(ancestor),
|
|
target = shortLog(bs),
|
|
ancestorStateRoot = shortLog(ancestorRoot),
|
|
targetStateRoot = shortLog(getStateRoot(state.data)),
|
|
found,
|
|
assignDur,
|
|
replayDur
|
|
else: # Normal case!
|
|
trace "State advanced",
|
|
blocks = ancestors.len,
|
|
slots = getStateField(state.data, slot) - ancestor.slot,
|
|
current = shortLog(current),
|
|
ancestor = shortLog(ancestor),
|
|
target = shortLog(bs),
|
|
ancestorStateRoot = shortLog(ancestorRoot),
|
|
targetStateRoot = shortLog(getStateRoot(state.data)),
|
|
found,
|
|
assignDur,
|
|
replayDur
|
|
|
|
true
|
|
|
|
proc delState(dag: ChainDAGRef, bs: BlockSlot) =
|
|
# Delete state state and mapping for a particular block+slot
|
|
if not isStateCheckpoint(bs):
|
|
return # We only ever save epoch states
|
|
|
|
if (let root = dag.db.getStateRoot(bs.blck.root, bs.slot); root.isSome()):
|
|
dag.db.delState(root.get())
|
|
dag.db.delStateRoot(bs.blck.root, bs.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()
|
|
while not cur.blck.isAncestorOf(dag.finalizedHead.blck):
|
|
dag.delState(cur) # TODO: should we move that disk I/O to `onSlotEnd`
|
|
|
|
if cur.isProposed():
|
|
dag.blocks.excl(KeyedBlockRef.init(cur.blck))
|
|
dag.db.delBlock(cur.blck.root)
|
|
|
|
if cur.blck.parent.isNil:
|
|
break
|
|
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.data):
|
|
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.data):
|
|
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
|
|
|
|
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
|
|
cur = dag.finalizedHead.stateCheckpoint.parentOrSlot
|
|
prev = dag.lastPrunePoint.stateCheckpoint.parentOrSlot
|
|
while cur.blck != nil and cur != prev:
|
|
if cur.slot.epoch mod EPOCHS_PER_STATE_SNAPSHOT != 0 and
|
|
cur.slot != dag.tail.slot:
|
|
dag.delState(cur)
|
|
cur = cur.parentOrSlot
|
|
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
|
|
|
|
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()
|
|
doAssert not newHead.parent.isNil() or newHead.slot <= dag.tail.slot
|
|
logScope:
|
|
newHead = shortLog(newHead)
|
|
|
|
if dag.head == newHead:
|
|
trace "No head block update"
|
|
return
|
|
|
|
let
|
|
lastHead = dag.head
|
|
lastHeadStateRoot = getStateRoot(dag.headState.data)
|
|
|
|
# Start off by making sure we have the right state - updateStateData will try
|
|
# to use existing in-memory states to make this smooth
|
|
var cache: StateCache
|
|
if not updateStateData(
|
|
dag, dag.headState, newHead.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.db.putHeadBlock(newHead.root)
|
|
|
|
withState(dag.headState.data):
|
|
when stateFork >= BeaconStateFork.Altair:
|
|
dag.headSyncCommittees = state.data.get_sync_committee_cache(cache)
|
|
|
|
let
|
|
finalized_checkpoint =
|
|
getStateField(dag.headState.data, finalized_checkpoint)
|
|
finalizedSlot = max(
|
|
finalized_checkpoint.epoch.compute_start_slot_at_epoch(),
|
|
dag.tail.slot)
|
|
|
|
finalizedHead = newHead.atSlot(finalizedSlot)
|
|
|
|
doAssert (not finalizedHead.blck.isNil),
|
|
"Block graph should always lead to a finalized block"
|
|
|
|
let (isAncestor, ancestorDepth) = lastHead.getDepth(newHead)
|
|
if not(isAncestor):
|
|
notice "Updated head block with chain reorg",
|
|
lastHead = shortLog(lastHead),
|
|
headParent = shortLog(newHead.parent),
|
|
stateRoot = shortLog(getStateRoot(dag.headState.data)),
|
|
headBlock = shortLog(dag.headState.blck),
|
|
stateSlot = shortLog(getStateField(dag.headState.data, slot)),
|
|
justified = shortLog(getStateField(
|
|
dag.headState.data, current_justified_checkpoint)),
|
|
finalized = shortLog(getStateField(
|
|
dag.headState.data, finalized_checkpoint))
|
|
|
|
if not(isNil(dag.onReorgHappened)):
|
|
let data = ReorgInfoObject.init(dag.head.slot, uint64(ancestorDepth),
|
|
lastHead.root, newHead.root,
|
|
lastHeadStateRoot,
|
|
getStateRoot(dag.headState.data))
|
|
dag.onReorgHappened(data)
|
|
|
|
# A reasonable criterion for "reorganizations of the chain"
|
|
quarantine.clearQuarantine()
|
|
beacon_reorgs_total_total.inc()
|
|
beacon_reorgs_total.inc()
|
|
else:
|
|
debug "Updated head block",
|
|
head = shortLog(dag.headState.blck),
|
|
stateRoot = shortLog(getStateRoot(dag.headState.data)),
|
|
justified = shortLog(getStateField(
|
|
dag.headState.data, current_justified_checkpoint)),
|
|
finalized = shortLog(getStateField(
|
|
dag.headState.data, finalized_checkpoint))
|
|
|
|
if not(isNil(dag.onHeadChanged)):
|
|
let
|
|
currentEpoch = epoch(newHead.slot)
|
|
depBlock = dag.head.dependentBlock(dag.tail, currentEpoch)
|
|
prevDepBlock = dag.head.prevDependentBlock(dag.tail, currentEpoch)
|
|
epochTransition = (finalizedHead != dag.finalizedHead)
|
|
let data = HeadChangeInfoObject.init(dag.head.slot, dag.head.root,
|
|
getStateRoot(dag.headState.data),
|
|
epochTransition, depBlock.root,
|
|
prevDepBlock.root)
|
|
dag.onHeadChanged(data)
|
|
|
|
# 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_pending_deposits.set(
|
|
getStateField(dag.headState.data, eth1_data).deposit_count.toGaugeValue -
|
|
getStateField(dag.headState.data, eth1_deposit_index).toGaugeValue)
|
|
beacon_processed_deposits_total.set(
|
|
getStateField(dag.headState.data, eth1_deposit_index).toGaugeValue)
|
|
|
|
beacon_head_root.set newHead.root.toGaugeValue
|
|
beacon_head_slot.set newHead.slot.toGaugeValue
|
|
|
|
withState(dag.headState.data):
|
|
# 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 lastHead.slot.epoch != newHead.slot.epoch:
|
|
# Epoch updated - in theory, these could happen when the wall clock
|
|
# changes epoch, even if there is no new block / head, but we'll delay
|
|
# updating them until a block confirms the change
|
|
beacon_current_justified_epoch.set(
|
|
getStateField(
|
|
dag.headState.data, current_justified_checkpoint).epoch.toGaugeValue)
|
|
beacon_current_justified_root.set(
|
|
getStateField(
|
|
dag.headState.data, current_justified_checkpoint).root.toGaugeValue)
|
|
beacon_previous_justified_epoch.set(
|
|
getStateField(
|
|
dag.headState.data, previous_justified_checkpoint).epoch.toGaugeValue)
|
|
beacon_previous_justified_root.set(
|
|
getStateField(
|
|
dag.headState.data, previous_justified_checkpoint).root.toGaugeValue)
|
|
|
|
let
|
|
epochRef = getEpochRef(dag, dag.headState, cache)
|
|
number_of_active_validators =
|
|
epochRef.shuffled_active_validator_indices.lenu64().toGaugeValue
|
|
|
|
beacon_active_validators.set(number_of_active_validators)
|
|
beacon_current_active_validators.set(number_of_active_validators)
|
|
|
|
if finalizedHead != dag.finalizedHead:
|
|
debug "Reached new finalization checkpoint",
|
|
head = shortLog(dag.headState.blck),
|
|
stateRoot = shortLog(getStateRoot(dag.headState.data)),
|
|
justified = shortLog(getStateField(
|
|
dag.headState.data, current_justified_checkpoint)),
|
|
finalized = shortLog(getStateField(
|
|
dag.headState.data, finalized_checkpoint))
|
|
|
|
block:
|
|
# Update `dag.finalizedBlocks` with all newly finalized blocks (those
|
|
# newer than the previous finalized head), then update `dag.finalizedHead`
|
|
|
|
dag.finalizedBlocks.setLen(finalizedHead.slot - dag.tail.slot + 1)
|
|
var tmp = finalizedHead.blck
|
|
while not isNil(tmp) and tmp.slot >= dag.finalizedHead.slot:
|
|
dag.finalizedBlocks[(tmp.slot - dag.tail.slot).int] = tmp
|
|
tmp = tmp.parent
|
|
|
|
dag.finalizedHead = finalizedHead
|
|
|
|
beacon_finalized_epoch.set(getStateField(
|
|
dag.headState.data, finalized_checkpoint).epoch.toGaugeValue)
|
|
beacon_finalized_root.set(getStateField(
|
|
dag.headState.data, finalized_checkpoint).root.toGaugeValue)
|
|
|
|
# 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()
|
|
|
|
# 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.data)
|
|
elif dag.finalizedHead.slot + SLOTS_PER_HISTORICAL_ROOT > dag.head.slot:
|
|
getStateField(dag.headState.data, 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(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
|
|
# TODO probably should just init a block pool with the freshly written
|
|
# state - but there's more refactoring needed to make it nice - doing
|
|
# a minimal patch for now..
|
|
|
|
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.putGenesisBlock(blck.root)
|
|
db.putBlock(blck)
|
|
|
|
db.putStateRoot(state.latest_block_root(), state.data.slot, state.root)
|
|
db.putState(state.root, state.data)
|
|
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.putTailBlock(blck.root)
|
|
db.putHeadBlock(blck.root)
|
|
|
|
db.putStateRoot(state.latest_block_root(), state.data.slot, state.root)
|
|
db.putState(state.root, state.data)
|
|
|
|
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, slot.compute_epoch_at_slot(), false)
|
|
if tmp.isErr():
|
|
return none(ValidatorIndex)
|
|
tmp.get()
|
|
slotInEpoch = slot - slot.compute_epoch_at_slot().compute_start_slot_at_epoch()
|
|
|
|
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/v1.1.5/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))
|
|
|
|
proc getBlockSSZ*(dag: ChainDAGRef, id: 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
|
|
case dag.cfg.blockForkAtEpoch(id.slot.epoch)
|
|
of BeaconBlockFork.Phase0:
|
|
dag.db.getPhase0BlockSSZ(id.root, bytes)
|
|
of BeaconBlockFork.Altair:
|
|
dag.db.getAltairBlockSSZ(id.root, bytes)
|
|
of BeaconBlockFork.Bellatrix:
|
|
dag.db.getMergeBlockSSZ(id.root, bytes)
|