nimbus-eth2/beacon_chain/beacon_node_common.nim

146 lines
5.0 KiB
Nim

# beacon_chain
# Copyright (c) 2018-2020 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.
# Common routines for a BeaconNode and a BeaconValidator node
import
# Standard library
os, tables,
# Nimble packages
chronos, json_rpc/rpcserver, metrics,
chronicles,
# Local modules
spec/[datatypes, crypto, digest, helpers],
conf, time, beacon_chain_db, sszdump,
attestation_pool, block_pool, eth2_network,
beacon_node_types, mainchain_monitor, request_manager
# This removes an invalid Nim warning that the digest module is unused here
# It's currently used for `shortLog(head.blck.root)`
type Eth2Digest = digest.Eth2Digest
type
RpcServer* = RpcHttpServer
BeaconNode* = ref object
nickname*: string
network*: Eth2Node
netKeys*: KeyPair
requestManager*: RequestManager
db*: BeaconChainDB
config*: BeaconNodeConf
attachedValidators*: ValidatorPool
blockPool*: BlockPool
attestationPool*: AttestationPool
mainchainMonitor*: MainchainMonitor
beaconClock*: BeaconClock
rpcServer*: RpcServer
forkDigest*: ForkDigest
topicBeaconBlocks*: string
topicAggregateAndProofs*: string
syncLoop*: Future[void]
const
MaxEmptySlotCount* = uint64(10*60) div SECONDS_PER_SLOT
# Metrics
declareGauge beacon_head_root,
"Root of the head block of the beacon chain"
# Metrics for tracking attestation and beacon block loss
declareCounter beacon_blocks_received,
"Number of beacon chain blocks received by this peer"
proc onAttestation*(node: BeaconNode, attestation: Attestation) =
# We received an attestation from the network but don't know much about it
# yet - in particular, we haven't verified that it belongs to particular chain
# we're on, or that it follows the rules of the protocol
logScope: pcs = "on_attestation"
let
wallSlot = node.beaconClock.now().toSlot()
head = node.blockPool.head
debug "Attestation received",
attestation = shortLog(attestation),
headRoot = shortLog(head.blck.root),
headSlot = shortLog(head.blck.slot),
wallSlot = shortLog(wallSlot.slot),
cat = "consensus" # Tag "consensus|attestation"?
if not wallSlot.afterGenesis or wallSlot.slot < head.blck.slot:
warn "Received attestation before genesis or head - clock is wrong?",
afterGenesis = wallSlot.afterGenesis,
wallSlot = shortLog(wallSlot.slot),
headSlot = shortLog(head.blck.slot),
cat = "clock_drift" # Tag "attestation|clock_drift"?
return
if attestation.data.slot > head.blck.slot and
(attestation.data.slot - head.blck.slot) > MaxEmptySlotCount:
warn "Ignoring attestation, head block too old (out of sync?)",
attestationSlot = attestation.data.slot, headSlot = head.blck.slot
return
node.attestationPool.add(attestation)
proc storeBlock*(
node: BeaconNode, signedBlock: SignedBeaconBlock): Result[void, BlockError] =
let blockRoot = hash_tree_root(signedBlock.message)
debug "Block received",
signedBlock = shortLog(signedBlock.message),
blockRoot = shortLog(blockRoot),
cat = "block_listener",
pcs = "receive_block"
if node.config.dumpEnabled:
dump(node.config.dumpDir / "incoming", signedBlock, blockRoot)
beacon_blocks_received.inc()
discard ? node.blockPool.add(blockRoot, signedBlock)
# The block we received contains attestations, and we might not yet know about
# all of them. Let's add them to the attestation pool - in case they block
# is not yet resolved, neither will the attestations be!
# But please note that we only care about recent attestations.
# TODO shouldn't add attestations if the block turns out to be invalid..
let currentSlot = node.beaconClock.now.toSlot
if currentSlot.afterGenesis and
signedBlock.message.slot.epoch + 1 >= currentSlot.slot.epoch:
for attestation in signedBlock.message.body.attestations:
node.onAttestation(attestation)
ok()
proc onBeaconBlock*(node: BeaconNode, signedBlock: SignedBeaconBlock) =
# We received a block but don't know much about it yet - in particular, we
# don't know if it's part of the chain we're currently building.
discard node.storeBlock(signedBlock)
proc updateHead*(node: BeaconNode): BlockRef =
# Check pending attestations - maybe we found some blocks for them
node.attestationPool.resolve()
# Grab the new head according to our latest attestation data
let newHead = node.attestationPool.selectHead()
# Store the new head in the block pool - this may cause epochs to be
# justified and finalized
node.blockPool.updateHead(newHead)
beacon_head_root.set newHead.root.toGaugeValue
newHead
template findIt*(s: openarray, predicate: untyped): int64 =
var res = -1
for i, it {.inject.} in s:
if predicate:
res = i
break
res