nimbus-eth2/beacon_chain/gossip_processing/consensus_manager.nim

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# beacon_chain
# Copyright (c) 2018-2021 Status Research & Development GmbH
# Licensed and distributed under either of
# * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
# * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
# at your option. This file may not be copied, modified, or distributed except according to those terms.
{.push raises: [Defect].}
import
chronicles, chronos,
../spec/[crypto, datatypes],
../consensus_object_pools/[blockchain_dag, attestation_pool]
# TODO: Move to "consensus_object_pools" folder
type
ConsensusManager* = object
expectedSlot: Slot
expectedBlockReceived: Future[bool]
# Validated & Verified
# ----------------------------------------------------------------
dag*: ChainDAGRef
attestationPool*: ref AttestationPool
# Missing info
# ----------------------------------------------------------------
quarantine*: QuarantineRef
# Initialization
# ------------------------------------------------------------------------------
proc new*(T: type ConsensusManager,
dag: ChainDAGRef,
attestationPool: ref AttestationPool,
quarantine: QuarantineRef
): ref ConsensusManager =
(ref ConsensusManager)(
dag: dag,
attestationPool: attestationPool,
quarantine: quarantine
)
# Consensus Management
# -----------------------------------------------------------------------------------
proc checkExpectedBlock(self: var ConsensusManager) =
if self.expectedBlockReceived == nil:
return
if self.dag.head.slot < self.expectedSlot:
return
self.expectedBlockReceived.complete(true)
self.expectedBlockReceived = nil # Don't keep completed futures around!
proc expectBlock*(self: var ConsensusManager, expectedSlot: Slot): Future[bool] =
## Return a future that will complete when a head is selected whose slot is
## equal or greater than the given slot, or a new expectation is created
if self.expectedBlockReceived != nil:
# Reset the old future to not leave it hanging.. an alternative would be to
# cancel it, but it doesn't make any practical difference for now
self.expectedBlockReceived.complete(false)
let fut = newFuture[bool]("ConsensusManager.expectBlock")
self.expectedSlot = expectedSlot
self.expectedBlockReceived = fut
# It might happen that by the time we're expecting a block, it might have
# already been processed!
self.checkExpectedBlock()
return fut
proc updateHead*(self: var ConsensusManager, wallSlot: Slot) =
## Trigger fork choice and update the DAG with the new head block
## This does not automatically prune the DAG after finalization
## `pruneFinalized` must be called for pruning.
# Grab the new head according to our latest attestation data
let newHead = self.attestationPool[].selectHead(wallSlot)
if newHead.isNil():
warn "Head selection failed, using previous head",
head = shortLog(self.dag.head), wallSlot
return
# Store the new head in the chain DAG - this may cause epochs to be
# justified and finalized
self.dag.updateHead(newHead, self.quarantine)
self.checkExpectedBlock()
proc pruneStateCachesAndForkChoice*(self: var ConsensusManager) =
## Prune unneeded and invalidated data after finalization
## - the DAG state checkpoints
## - the DAG EpochRef
## - the attestation pool/fork choice
# Cleanup DAG & fork choice if we have a finalized head
if self.dag.needStateCachesAndForkChoicePruning():
self.dag.pruneStateCachesDAG()
self.attestationPool[].prune()