nimbus-eth2/beacon_chain/spec/network.nim

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# 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.
{.push raises: [Defect].}
import
strformat,
datatypes, helpers
const
# https://github.com/ethereum/eth2.0-specs/blob/v0.12.1/specs/phase0/p2p-interface.md#topics-and-messages
topicBeaconBlocksSuffix* = "beacon_block/ssz"
topicVoluntaryExitsSuffix* = "voluntary_exit/ssz"
topicProposerSlashingsSuffix* = "proposer_slashing/ssz"
topicAttesterSlashingsSuffix* = "attester_slashing/ssz"
topicAggregateAndProofsSuffix* = "beacon_aggregate_and_proof/ssz"
# https://github.com/ethereum/eth2.0-specs/blob/v0.12.1/specs/phase0/validator.md#misc
ATTESTATION_SUBNET_COUNT* = 64
defaultEth2TcpPort* = 9000
# This is not part of the spec yet!
defaultEth2RpcPort* = 9090
func getBeaconBlocksTopic*(forkDigest: ForkDigest): string =
try:
&"/eth2/{$forkDigest}/{topicBeaconBlocksSuffix}"
except ValueError as e:
raiseAssert e.msg
2020-04-15 03:11:45 +00:00
func getVoluntaryExitsTopic*(forkDigest: ForkDigest): string =
try:
&"/eth2/{$forkDigest}/{topicVoluntaryExitsSuffix}"
except ValueError as e:
raiseAssert e.msg
func getProposerSlashingsTopic*(forkDigest: ForkDigest): string =
try:
&"/eth2/{$forkDigest}/{topicProposerSlashingsSuffix}"
except ValueError as e:
raiseAssert e.msg
func getAttesterSlashingsTopic*(forkDigest: ForkDigest): string =
try:
&"/eth2/{$forkDigest}/{topicAttesterSlashingsSuffix}"
except ValueError as e:
raiseAssert e.msg
func getAggregateAndProofsTopic*(forkDigest: ForkDigest): string =
try:
&"/eth2/{$forkDigest}/{topicAggregateAndProofsSuffix}"
except ValueError as e:
raiseAssert e.msg
# https://github.com/ethereum/eth2.0-specs/blob/v0.12.1/specs/phase0/validator.md#broadcast-attestation
func compute_subnet_for_attestation*(
num_active_validators: uint64, attestation: Attestation): uint64 =
# Compute the correct subnet for an attestation for Phase 0.
# Note, this mimics expected Phase 1 behavior where attestations will be
# mapped to their shard subnet.
#
# The spec version has params (state: BeaconState, attestation: Attestation),
# but it's only to call get_committee_count_at_slot(), which needs only epoch
# and the number of active validators.
let
slots_since_epoch_start = attestation.data.slot mod SLOTS_PER_EPOCH
committees_since_epoch_start =
get_committee_count_at_slot(num_active_validators) * slots_since_epoch_start
(committees_since_epoch_start + attestation.data.index) mod ATTESTATION_SUBNET_COUNT
# https://github.com/ethereum/eth2.0-specs/blob/v0.12.1/specs/phase0/validator.md#broadcast-attestation
func getAttestationTopic*(forkDigest: ForkDigest, subnetIndex: uint64):
string =
# This is for subscribing or broadcasting manually to a known index.
try:
&"/eth2/{$forkDigest}/beacon_attestation_{subnetIndex}/ssz"
except ValueError as e:
raiseAssert e.msg
func getAttestationTopic*(forkDigest: ForkDigest, attestation: Attestation, num_active_validators: uint64): string =
getAttestationTopic(
forkDigest,
compute_subnet_for_attestation(num_active_validators, attestation))