95 lines
3.4 KiB
Nim
95 lines
3.4 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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{.push raises: [Defect].}
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import
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strformat,
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datatypes, helpers
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const
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# https://github.com/ethereum/eth2.0-specs/blob/v0.12.1/specs/phase0/p2p-interface.md#topics-and-messages
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topicBeaconBlocksSuffix* = "beacon_block/ssz"
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topicVoluntaryExitsSuffix* = "voluntary_exit/ssz"
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topicProposerSlashingsSuffix* = "proposer_slashing/ssz"
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topicAttesterSlashingsSuffix* = "attester_slashing/ssz"
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topicAggregateAndProofsSuffix* = "beacon_aggregate_and_proof/ssz"
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# https://github.com/ethereum/eth2.0-specs/blob/v0.12.1/specs/phase0/validator.md#misc
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ATTESTATION_SUBNET_COUNT* = 64
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defaultEth2TcpPort* = 9000
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# This is not part of the spec yet!
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defaultEth2RpcPort* = 9090
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func getBeaconBlocksTopic*(forkDigest: ForkDigest): string =
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try:
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&"/eth2/{$forkDigest}/{topicBeaconBlocksSuffix}"
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except ValueError as e:
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raiseAssert e.msg
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func getVoluntaryExitsTopic*(forkDigest: ForkDigest): string =
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try:
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&"/eth2/{$forkDigest}/{topicVoluntaryExitsSuffix}"
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except ValueError as e:
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raiseAssert e.msg
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func getProposerSlashingsTopic*(forkDigest: ForkDigest): string =
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try:
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&"/eth2/{$forkDigest}/{topicProposerSlashingsSuffix}"
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except ValueError as e:
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raiseAssert e.msg
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func getAttesterSlashingsTopic*(forkDigest: ForkDigest): string =
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try:
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&"/eth2/{$forkDigest}/{topicAttesterSlashingsSuffix}"
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except ValueError as e:
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raiseAssert e.msg
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func getAggregateAndProofsTopic*(forkDigest: ForkDigest): string =
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try:
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&"/eth2/{$forkDigest}/{topicAggregateAndProofsSuffix}"
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except ValueError as e:
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raiseAssert e.msg
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# https://github.com/ethereum/eth2.0-specs/blob/v0.12.1/specs/phase0/validator.md#broadcast-attestation
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# https://github.com/ethereum/eth2.0-specs/pull/1876
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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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uint64 =
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# Compute the correct subnet for an attestation for Phase 0.
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# Note, this mimics expected Phase 1 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 mod SLOTS_PER_EPOCH
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committees_since_epoch_start =
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committees_per_slot * slots_since_epoch_start
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(committees_since_epoch_start + committee_index.uint64) mod
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ATTESTATION_SUBNET_COUNT
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# https://github.com/ethereum/eth2.0-specs/blob/v0.12.1/specs/phase0/validator.md#broadcast-attestation
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func getAttestationTopic*(forkDigest: ForkDigest, subnetIndex: uint64):
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string =
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# This is for subscribing or broadcasting manually to a known index.
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doAssert subnetIndex < ATTESTATION_SUBNET_COUNT
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try:
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&"/eth2/{$forkDigest}/beacon_attestation_{subnetIndex}/ssz"
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except ValueError as e:
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raiseAssert e.msg
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func getAttestationTopic*(forkDigest: ForkDigest,
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attestation: Attestation,
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num_active_validators: uint64): string =
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getAttestationTopic(
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forkDigest,
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compute_subnet_for_attestation(
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get_committee_count_per_slot(num_active_validators),
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attestation.data.slot, attestation.data.index.CommitteeIndex))
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