209 lines
8.9 KiB
Nim
209 lines
8.9 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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when (NimMajor, NimMinor) < (1, 4):
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{.push raises: [Defect].}
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else:
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{.push raises: [].}
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import
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"."/[helpers, forks],
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"."/datatypes/base
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export base
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const
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# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/p2p-interface.md#topics-and-messages
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topicBeaconBlocksSuffix* = "beacon_block/ssz_snappy"
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topicVoluntaryExitsSuffix* = "voluntary_exit/ssz_snappy"
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topicProposerSlashingsSuffix* = "proposer_slashing/ssz_snappy"
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topicAttesterSlashingsSuffix* = "attester_slashing/ssz_snappy"
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topicAggregateAndProofsSuffix* = "beacon_aggregate_and_proof/ssz_snappy"
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# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.2/specs/phase0/p2p-interface.md#configuration
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MAX_CHUNK_SIZE* = 1 * 1024 * 1024 # bytes
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GOSSIP_MAX_SIZE* = 1 * 1024 * 1024 # bytes
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TTFB_TIMEOUT* = 5.seconds
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RESP_TIMEOUT* = 10.seconds
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# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/bellatrix/p2p-interface.md#configuration
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GOSSIP_MAX_SIZE_BELLATRIX* = 10 * 1024 * 1024 # bytes
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MAX_CHUNK_SIZE_BELLATRIX* = 10 * 1024 * 1024 # bytes
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defaultEth2TcpPort* = 9000
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defaultEth2TcpPortDesc* = $defaultEth2TcpPort
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# This is not part of the spec! But its port which uses Lighthouse
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defaultEth2RestPort* = 5052
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defaultEth2RestPortDesc* = $defaultEth2RestPort
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enrAttestationSubnetsField* = "attnets"
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enrSyncSubnetsField* = "syncnets"
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enrForkIdField* = "eth2"
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template eth2Prefix(forkDigest: ForkDigest): string =
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"/eth2/" & $forkDigest & "/"
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func getBeaconBlocksTopic*(forkDigest: ForkDigest): string =
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eth2Prefix(forkDigest) & topicBeaconBlocksSuffix
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func getVoluntaryExitsTopic*(forkDigest: ForkDigest): string =
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eth2Prefix(forkDigest) & topicVoluntaryExitsSuffix
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func getProposerSlashingsTopic*(forkDigest: ForkDigest): string =
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eth2Prefix(forkDigest) & topicProposerSlashingsSuffix
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func getAttesterSlashingsTopic*(forkDigest: ForkDigest): string =
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eth2Prefix(forkDigest) & topicAttesterSlashingsSuffix
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func getAggregateAndProofsTopic*(forkDigest: ForkDigest): string =
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eth2Prefix(forkDigest) & topicAggregateAndProofsSuffix
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# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/validator.md#broadcast-attestation
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func compute_subnet_for_attestation*(
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committees_per_slot: uint64, slot: Slot, committee_index: CommitteeIndex):
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SubnetId =
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## Compute the correct subnet for an attestation for Phase 0.
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# Note, this mimics expected future behavior where attestations will be
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# mapped to their shard subnet.
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let
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slots_since_epoch_start = slot.since_epoch_start()
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committees_since_epoch_start =
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committees_per_slot * slots_since_epoch_start
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SubnetId(
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(committees_since_epoch_start + committee_index.asUInt64) mod
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ATTESTATION_SUBNET_COUNT)
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# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/phase0/validator.md#broadcast-attestation
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func getAttestationTopic*(forkDigest: ForkDigest,
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subnetId: SubnetId): string =
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## For subscribing and unsubscribing to/from a subnet.
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eth2Prefix(forkDigest) & "beacon_attestation_" & $(subnetId) & "/ssz_snappy"
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# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/altair/p2p-interface.md#topics-and-messages
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func getSyncCommitteeTopic*(forkDigest: ForkDigest,
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subcommitteeIdx: SyncSubcommitteeIndex): string =
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## For subscribing and unsubscribing to/from a subnet.
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eth2Prefix(forkDigest) & "sync_committee_" & $subcommitteeIdx & "/ssz_snappy"
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# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/altair/p2p-interface.md#topics-and-messages
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func getSyncCommitteeContributionAndProofTopic*(forkDigest: ForkDigest): string =
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## For subscribing and unsubscribing to/from a subnet.
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eth2Prefix(forkDigest) & "sync_committee_contribution_and_proof/ssz_snappy"
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# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/altair/light-client/p2p-interface.md#light_client_finality_update
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func getLightClientFinalityUpdateTopic*(forkDigest: ForkDigest): string =
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## For broadcasting or obtaining the latest `LightClientFinalityUpdate`.
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eth2Prefix(forkDigest) & "light_client_finality_update/ssz_snappy"
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# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/altair/light-client/p2p-interface.md#light_client_optimistic_update
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func getLightClientOptimisticUpdateTopic*(forkDigest: ForkDigest): string =
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## For broadcasting or obtaining the latest `LightClientOptimisticUpdate`.
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eth2Prefix(forkDigest) & "light_client_optimistic_update/ssz_snappy"
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func getENRForkID*(cfg: RuntimeConfig,
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epoch: Epoch,
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genesis_validators_root: Eth2Digest): ENRForkID =
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let
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current_fork_version = cfg.forkVersionAtEpoch(epoch)
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next_fork_version = if cfg.nextForkEpochAtEpoch(epoch) == FAR_FUTURE_EPOCH:
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current_fork_version
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else:
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cfg.forkVersionAtEpoch(cfg.nextForkEpochAtEpoch(epoch))
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fork_digest = compute_fork_digest(current_fork_version,
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genesis_validators_root)
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ENRForkID(
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fork_digest: fork_digest,
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next_fork_version: next_fork_version,
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next_fork_epoch: cfg.nextForkEpochAtEpoch(epoch))
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func getDiscoveryForkID*(cfg: RuntimeConfig,
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epoch: Epoch,
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genesis_validators_root: Eth2Digest): ENRForkID =
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# Until 1 epoch from fork, return pre-fork value.
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if cfg.nextForkEpochAtEpoch(epoch) - epoch <= 1:
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getENRForkID(cfg, epoch, genesis_validators_root)
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else:
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let
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current_fork_version = cfg.forkVersionAtEpoch(epoch)
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fork_digest = compute_fork_digest(current_fork_version,
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genesis_validators_root)
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ENRForkID(
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fork_digest: fork_digest,
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next_fork_version: current_fork_version,
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next_fork_epoch: FAR_FUTURE_EPOCH)
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# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/altair/p2p-interface.md#transitioning-the-gossip
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type GossipState* = set[BeaconStateFork]
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func getTargetGossipState*(
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epoch, ALTAIR_FORK_EPOCH, BELLATRIX_FORK_EPOCH: Epoch, isBehind: bool):
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GossipState =
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if isBehind:
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{}
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# The order of these checks doesn't matter.
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elif epoch >= BELLATRIX_FORK_EPOCH:
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{BeaconStateFork.Bellatrix}
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elif epoch + 1 < ALTAIR_FORK_EPOCH:
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{BeaconStateFork.Phase0}
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# Order remaining checks so ALTAIR_FORK_EPOCH == BELLATRIX_FORK_EPOCH works
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# and when the transition zones align contiguously, or are separated by
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# intermediate pure-Altair epochs.
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#
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# In the first case, should never enable Altair, and there's also never
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# a Phase -> Altair, or Altair -> Bellatrix gossip transition epoch. In
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# contiguous Phase0 -> Altair and Altair -> Bellatrix transitions, that
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# pure Altair state gossip state never occurs, but it works without any
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# special cases so long as one checks for transition-to-fork+1 before a
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# pure fork gossip state.
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#
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# Therefore, check for transition-to-merge before pure-Altair.
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elif epoch + 1 >= BELLATRIX_FORK_EPOCH:
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# As there are only two fork epochs and there's no transition to phase0
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{if ALTAIR_FORK_EPOCH == BELLATRIX_FORK_EPOCH:
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BeaconStateFork.Phase0
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else:
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BeaconStateFork.Altair,
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BeaconStateFork.Bellatrix}
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elif epoch >= ALTAIR_FORK_EPOCH:
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{BeaconStateFork.Altair}
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# Must be after the case which catches phase0 => merge
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elif epoch + 1 >= ALTAIR_FORK_EPOCH:
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{BeaconStateFork.Phase0, BeaconStateFork.Altair}
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else:
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raiseAssert "Unknown target gossip state"
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func nearSyncCommitteePeriod*(epoch: Epoch): Option[uint64] =
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# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/altair/validator.md#sync-committee-subnet-stability
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if epoch.is_sync_committee_period():
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return some 0'u64
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let epochsBefore =
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EPOCHS_PER_SYNC_COMMITTEE_PERIOD - epoch.since_sync_committee_period_start()
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if epoch.is_sync_committee_period() or epochsBefore <= SYNC_COMMITTEE_SUBNET_COUNT:
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return some epochsBefore
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none(uint64)
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func getSyncSubnets*(
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nodeHasPubkey: proc(pubkey: ValidatorPubKey):
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bool {.noSideEffect, raises: [Defect].},
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syncCommittee: SyncCommittee): SyncnetBits =
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var res: SyncnetBits
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for i, pubkey in syncCommittee.pubkeys:
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if not nodeHasPubkey(pubkey):
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continue
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# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/altair/validator.md#broadcast-sync-committee-message
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# The first quarter of the pubkeys map to subnet 0, the second quarter to
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# subnet 1, the third quarter to subnet 2 and the final quarter to subnet
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# 3.
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res.setBit(i div (SYNC_COMMITTEE_SIZE div SYNC_COMMITTEE_SUBNET_COUNT))
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res
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