138 lines
4.9 KiB
Nim
138 lines
4.9 KiB
Nim
# beacon_chain
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# Copyright (c) 2018-2020 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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# Common routines for a BeaconNode and a BeaconValidator node
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import
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# Standard library
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os, tables,
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# Nimble packages
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chronos, json_rpc/rpcserver, metrics,
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chronicles,
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# Local modules
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spec/[datatypes, crypto, helpers],
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conf, time, beacon_chain_db, sszdump,
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attestation_pool, block_pool, eth2_network,
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beacon_node_types, mainchain_monitor, request_manager
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# TODO figure out how to silence the `unused pragma` warning for specific builds of this
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# https://discordapp.com/channels/613988663034118151/614014714590134292/713053239297179668
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import spec/digest
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type
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RpcServer* = RpcHttpServer
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BeaconNode* = ref object
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nickname*: string
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network*: Eth2Node
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netKeys*: KeyPair
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requestManager*: RequestManager
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db*: BeaconChainDB
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config*: BeaconNodeConf
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attachedValidators*: ValidatorPool
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blockPool*: BlockPool
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attestationPool*: AttestationPool
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mainchainMonitor*: MainchainMonitor
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beaconClock*: BeaconClock
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rpcServer*: RpcServer
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forkDigest*: ForkDigest
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topicBeaconBlocks*: string
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topicAggregateAndProofs*: string
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syncLoop*: Future[void]
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const
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MaxEmptySlotCount* = uint64(10*60) div SECONDS_PER_SLOT
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# Metrics
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declareGauge beacon_head_root,
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"Root of the head block of the beacon chain"
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# Metrics for tracking attestation and beacon block loss
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declareCounter beacon_blocks_received,
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"Number of beacon chain blocks received by this peer"
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proc onAttestation*(node: BeaconNode, attestation: Attestation) =
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# We received an attestation from the network but don't know much about it
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# yet - in particular, we haven't verified that it belongs to particular chain
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# we're on, or that it follows the rules of the protocol
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logScope: pcs = "on_attestation"
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let
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wallSlot = node.beaconClock.now().toSlot()
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head = node.blockPool.head
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debug "Attestation received",
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attestation = shortLog(attestation),
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headRoot = shortLog(head.blck.root),
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headSlot = shortLog(head.blck.slot),
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wallSlot = shortLog(wallSlot.slot),
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cat = "consensus" # Tag "consensus|attestation"?
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if not wallSlot.afterGenesis or wallSlot.slot < head.blck.slot:
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warn "Received attestation before genesis or head - clock is wrong?",
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afterGenesis = wallSlot.afterGenesis,
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wallSlot = shortLog(wallSlot.slot),
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headSlot = shortLog(head.blck.slot),
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cat = "clock_drift" # Tag "attestation|clock_drift"?
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return
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if attestation.data.slot > head.blck.slot and
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(attestation.data.slot - head.blck.slot) > MaxEmptySlotCount:
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warn "Ignoring attestation, head block too old (out of sync?)",
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attestationSlot = attestation.data.slot, headSlot = head.blck.slot
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return
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node.attestationPool.add(attestation)
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proc storeBlock*(
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node: BeaconNode, signedBlock: SignedBeaconBlock): Result[void, BlockError] =
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let blockRoot = hash_tree_root(signedBlock.message)
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debug "Block received",
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signedBlock = shortLog(signedBlock.message),
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blockRoot = shortLog(blockRoot),
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cat = "block_listener",
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pcs = "receive_block"
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if node.config.dumpEnabled:
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dump(node.config.dumpDir / "incoming", signedBlock, blockRoot)
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beacon_blocks_received.inc()
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discard ? node.blockPool.add(blockRoot, signedBlock)
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# The block we received contains attestations, and we might not yet know about
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# all of them. Let's add them to the attestation pool - in case they block
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# is not yet resolved, neither will the attestations be!
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# But please note that we only care about recent attestations.
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# TODO shouldn't add attestations if the block turns out to be invalid..
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let currentSlot = node.beaconClock.now.toSlot
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if currentSlot.afterGenesis and
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signedBlock.message.slot.epoch + 1 >= currentSlot.slot.epoch:
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for attestation in signedBlock.message.body.attestations:
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node.onAttestation(attestation)
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ok()
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proc onBeaconBlock*(node: BeaconNode, signedBlock: SignedBeaconBlock) =
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# We received a block but don't know much about it yet - in particular, we
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# don't know if it's part of the chain we're currently building.
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discard node.storeBlock(signedBlock)
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proc updateHead*(node: BeaconNode): BlockRef =
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# Check pending attestations - maybe we found some blocks for them
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node.attestationPool.resolve()
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# Grab the new head according to our latest attestation data
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let newHead = node.attestationPool.selectHead()
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# Store the new head in the block pool - this may cause epochs to be
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# justified and finalized
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node.blockPool.updateHead(newHead)
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beacon_head_root.set newHead.root.toGaugeValue
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newHead
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