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nimbus-eth2/beacon_chain/spec/network.nim

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# beacon_chain
# Copyright (c) 2018-2023 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: [].}
import
"."/[helpers, forks],
"."/datatypes/base
export base
const
# https://github.com/ethereum/consensus-specs/blob/v1.3.0-rc.3/specs/phase0/p2p-interface.md#topics-and-messages
# https://github.com/ethereum/consensus-specs/blob/v1.3.0-rc.3/specs/capella/p2p-interface.md#topics-and-messages
# https://github.com/ethereum/consensus-specs/blob/v1.3.0-rc.1/specs/eip4844/p2p-interface.md#topics-and-messages
topicBeaconBlocksSuffix* = "beacon_block/ssz_snappy"
topicVoluntaryExitsSuffix* = "voluntary_exit/ssz_snappy"
topicProposerSlashingsSuffix* = "proposer_slashing/ssz_snappy"
topicAttesterSlashingsSuffix* = "attester_slashing/ssz_snappy"
topicAggregateAndProofsSuffix* = "beacon_aggregate_and_proof/ssz_snappy"
topicBlsToExecutionChangeSuffix* = "bls_to_execution_change/ssz_snappy"
topicBeaconBlockAndBlobsSidecarTopicSuffix* = "beacon_block_and_blobs_sidecar/ssz_snappy"
# https://github.com/ethereum/consensus-specs/blob/v1.3.0-rc.3/specs/phase0/p2p-interface.md#configuration
RESP_TIMEOUT* = 10.seconds
# https://github.com/ethereum/consensus-specs/blob/v1.3.0-rc.3/specs/bellatrix/p2p-interface.md#configuration
GOSSIP_MAX_SIZE_BELLATRIX* = 10 * 1024 * 1024 # bytes
MAX_CHUNK_SIZE_BELLATRIX* = 10 * 1024 * 1024 # bytes
defaultEth2TcpPort* = 9000
defaultEth2TcpPortDesc* = $defaultEth2TcpPort
# This is not part of the spec! But it's port which Lighthouse uses
defaultEth2RestPort* = 5052
defaultEth2RestPortDesc* = $defaultEth2RestPort
enrAttestationSubnetsField* = "attnets"
enrSyncSubnetsField* = "syncnets"
enrForkIdField* = "eth2"
template eth2Prefix(forkDigest: ForkDigest): string =
"/eth2/" & $forkDigest & "/"
func getBeaconBlocksTopic*(forkDigest: ForkDigest): string =
eth2Prefix(forkDigest) & topicBeaconBlocksSuffix
func getVoluntaryExitsTopic*(forkDigest: ForkDigest): string =
eth2Prefix(forkDigest) & topicVoluntaryExitsSuffix
func getProposerSlashingsTopic*(forkDigest: ForkDigest): string =
eth2Prefix(forkDigest) & topicProposerSlashingsSuffix
func getAttesterSlashingsTopic*(forkDigest: ForkDigest): string =
eth2Prefix(forkDigest) & topicAttesterSlashingsSuffix
func getAggregateAndProofsTopic*(forkDigest: ForkDigest): string =
eth2Prefix(forkDigest) & topicAggregateAndProofsSuffix
# https://github.com/ethereum/consensus-specs/blob/v1.3.0-rc.3/specs/capella/p2p-interface.md#topics-and-messages
func getBlsToExecutionChangeTopic*(forkDigest: ForkDigest): string =
eth2Prefix(forkDigest) & topicBlsToExecutionChangeSuffix
# https://github.com/ethereum/consensus-specs/blob/v1.3.0-rc.2/specs/eip4844/p2p-interface.md#topics-and-messages
func getBeaconBlockAndBlobsSidecarTopic*(forkDigest: ForkDigest): string =
eth2Prefix(forkDigest) & topicBeaconBlockAndBlobsSidecarTopicSuffix
# https://github.com/ethereum/consensus-specs/blob/v1.3.0-rc.3/specs/phase0/validator.md#broadcast-attestation
func compute_subnet_for_attestation*(
committees_per_slot: uint64, slot: Slot, committee_index: CommitteeIndex):
SubnetId =
## Compute the correct subnet for an attestation for Phase 0.
# Note, this mimics expected future behavior where attestations will be
# mapped to their shard subnet.
let
slots_since_epoch_start = slot.since_epoch_start()
committees_since_epoch_start =
committees_per_slot * slots_since_epoch_start
SubnetId(
(committees_since_epoch_start + committee_index.asUInt64) mod
ATTESTATION_SUBNET_COUNT)
# https://github.com/ethereum/consensus-specs/blob/v1.3.0-rc.3/specs/phase0/validator.md#broadcast-attestation
func getAttestationTopic*(forkDigest: ForkDigest,
subnetId: SubnetId): string =
## For subscribing and unsubscribing to/from a subnet.
eth2Prefix(forkDigest) & "beacon_attestation_" & $(subnetId) & "/ssz_snappy"
# https://github.com/ethereum/consensus-specs/blob/v1.3.0-rc.3/specs/altair/p2p-interface.md#topics-and-messages
func getSyncCommitteeTopic*(forkDigest: ForkDigest,
subcommitteeIdx: SyncSubcommitteeIndex): string =
## For subscribing and unsubscribing to/from a subnet.
eth2Prefix(forkDigest) & "sync_committee_" & $subcommitteeIdx & "/ssz_snappy"
# https://github.com/ethereum/consensus-specs/blob/v1.3.0-rc.3/specs/altair/p2p-interface.md#topics-and-messages
func getSyncCommitteeContributionAndProofTopic*(forkDigest: ForkDigest): string =
## For subscribing and unsubscribing to/from a subnet.
eth2Prefix(forkDigest) & "sync_committee_contribution_and_proof/ssz_snappy"
# https://github.com/ethereum/consensus-specs/blob/v1.3.0-rc.3/specs/altair/light-client/p2p-interface.md#light_client_finality_update
func getLightClientFinalityUpdateTopic*(forkDigest: ForkDigest): string =
## For broadcasting or obtaining the latest `LightClientFinalityUpdate`.
eth2Prefix(forkDigest) & "light_client_finality_update/ssz_snappy"
# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.1/specs/altair/light-client/p2p-interface.md#light_client_optimistic_update
func getLightClientOptimisticUpdateTopic*(forkDigest: ForkDigest): string =
## For broadcasting or obtaining the latest `LightClientOptimisticUpdate`.
eth2Prefix(forkDigest) & "light_client_optimistic_update/ssz_snappy"
func getENRForkID*(cfg: RuntimeConfig,
epoch: Epoch,
genesis_validators_root: Eth2Digest): ENRForkID =
let
current_fork_version = cfg.forkVersionAtEpoch(epoch)
next_fork_version = if cfg.nextForkEpochAtEpoch(epoch) == FAR_FUTURE_EPOCH:
current_fork_version
else:
cfg.forkVersionAtEpoch(cfg.nextForkEpochAtEpoch(epoch))
fork_digest = compute_fork_digest(current_fork_version,
genesis_validators_root)
ENRForkID(
fork_digest: fork_digest,
next_fork_version: next_fork_version,
next_fork_epoch: cfg.nextForkEpochAtEpoch(epoch))
func getDiscoveryForkID*(cfg: RuntimeConfig,
epoch: Epoch,
genesis_validators_root: Eth2Digest): ENRForkID =
# Until 1 epoch from fork, return pre-fork value.
if cfg.nextForkEpochAtEpoch(epoch) - epoch <= 1:
getENRForkID(cfg, epoch, genesis_validators_root)
else:
let
current_fork_version = cfg.forkVersionAtEpoch(epoch)
fork_digest = compute_fork_digest(current_fork_version,
genesis_validators_root)
ENRForkID(
fork_digest: fork_digest,
next_fork_version: current_fork_version,
next_fork_epoch: FAR_FUTURE_EPOCH)
# https://github.com/ethereum/consensus-specs/blob/v1.3.0-rc.3/specs/altair/p2p-interface.md#transitioning-the-gossip
type GossipState* = set[ConsensusFork]
func getTargetGossipState*(
epoch, ALTAIR_FORK_EPOCH, BELLATRIX_FORK_EPOCH, CAPELLA_FORK_EPOCH,
DENEB_FORK_EPOCH: Epoch, isBehind: bool): GossipState =
if isBehind:
return {}
doAssert BELLATRIX_FORK_EPOCH >= ALTAIR_FORK_EPOCH
doAssert CAPELLA_FORK_EPOCH >= BELLATRIX_FORK_EPOCH
doAssert DENEB_FORK_EPOCH >= CAPELLA_FORK_EPOCH
# https://github.com/ethereum/consensus-specs/issues/2902
# Don't care whether ALTAIR_FORK_EPOCH == BELLATRIX_FORK_EPOCH or
# BELLATRIX_FORK_EPOCH == CAPELLA_FORK_EPOCH works, because those
# theoretically possible networks are ill-defined regardless, and
# consequently prohibited by checkForkConsistency(). Therefore, a
# transitional epoch always exists, for every fork.
var targetForks: GossipState
template maybeIncludeFork(
targetFork: ConsensusFork, targetForkEpoch: Epoch,
successiveForkEpoch: Epoch) =
# Subscribe one epoch ahead
if epoch + 1 >= targetForkEpoch and epoch < successiveForkEpoch:
targetForks.incl targetFork
maybeIncludeFork(
ConsensusFork.Phase0, GENESIS_EPOCH, ALTAIR_FORK_EPOCH)
maybeIncludeFork(
ConsensusFork.Altair, ALTAIR_FORK_EPOCH, BELLATRIX_FORK_EPOCH)
maybeIncludeFork(
ConsensusFork.Bellatrix, BELLATRIX_FORK_EPOCH, CAPELLA_FORK_EPOCH)
maybeIncludeFork(
ConsensusFork.Capella, CAPELLA_FORK_EPOCH, DENEB_FORK_EPOCH)
maybeIncludeFork(
ConsensusFork.EIP4844, DENEB_FORK_EPOCH, FAR_FUTURE_EPOCH)
doAssert len(targetForks) <= 2
targetForks
func nearSyncCommitteePeriod*(epoch: Epoch): Opt[uint64] =
# https://github.com/ethereum/consensus-specs/blob/v1.3.0-rc.3/specs/altair/validator.md#sync-committee-subnet-stability
if epoch.is_sync_committee_period():
return Opt.some 0'u64
let epochsBefore =
EPOCHS_PER_SYNC_COMMITTEE_PERIOD - epoch.since_sync_committee_period_start()
if epoch.is_sync_committee_period() or epochsBefore <= SYNC_COMMITTEE_SUBNET_COUNT:
return Opt.some epochsBefore
Opt.none(uint64)
func getSyncSubnets*(
nodeHasPubkey: proc(pubkey: ValidatorPubKey):
bool {.noSideEffect, raises: [Defect].},
syncCommittee: SyncCommittee): SyncnetBits =
var res: SyncnetBits
for i, pubkey in syncCommittee.pubkeys:
if not nodeHasPubkey(pubkey):
continue
# https://github.com/ethereum/consensus-specs/blob/v1.3.0-rc.3/specs/altair/validator.md#broadcast-sync-committee-message
# The first quarter of the pubkeys map to subnet 0, the second quarter to
# subnet 1, the third quarter to subnet 2 and the final quarter to subnet
# 3.
res.setBit(i div (SYNC_COMMITTEE_SIZE div SYNC_COMMITTEE_SUBNET_COUNT))
res
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