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Add postconditions in consensus using nagini #20

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Add postconditions in consensus using nagini #20

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e1b3f1d
Remove asserts from consensus validity checks
saltiniroberto Dec 21, 2021
9939900
Add postconditions to consensus.py using nagini
saltiniroberto Dec 23, 2021
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1 change: 1 addition & 0 deletions requirements.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -4,6 +4,7 @@ eth2spec==1.1.2
# dev requirements
mypy
flake8
nagini

# test requirements
pytest
21 changes: 13 additions & 8 deletions src/dvspec/consensus.py
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Expand Up @@ -15,6 +15,8 @@
is_slashable_block,
)

from nagini_contracts.contracts import *


"""
Consensus Specification
Expand All @@ -25,10 +27,11 @@ def consensus_is_valid_attestation_data(slashing_db: SlashingDB,
attestation_data: AttestationData, attestation_duty: AttestationDuty) -> bool:
"""Determines if the given attestation is valid for the attestation duty.
"""
assert attestation_data.slot == attestation_duty.slot
assert attestation_data.index == attestation_duty.committee_index
assert not is_slashable_attestation_data(slashing_db, attestation_data, attestation_duty.pubkey)
return True
return \
attestation_data.slot == attestation_duty.slot and \
attestation_data.index == attestation_duty.committee_index and \
not is_slashable_attestation_data(slashing_db, attestation_data, attestation_duty.pubkey)



def consensus_on_attestation(slashing_db: SlashingDB, attestation_duty: AttestationDuty) -> AttestationData:
Expand All @@ -38,16 +41,16 @@ def consensus_on_attestation(slashing_db: SlashingDB, attestation_duty: Attestat
The consensus protocol must use `consensus_is_valid_attestation_data` to determine
validity of the proposed attestation value.
"""
Ensures(consensus_is_valid_attestation_data(slashing_db, Result(), attestation_duty));
pass


def consensus_is_valid_block(slashing_db: SlashingDB, block: BeaconBlock, proposer_duty: ProposerDuty) -> bool:
"""Determines if the given block is valid for the proposer duty.
"""
assert block.slot == proposer_duty.slot
# TODO: Assert correct block.proposer_index
assert not is_slashable_block(slashing_db, block, proposer_duty.pubkey)
return True
# TODO: Add correct block.proposer_index check \
return block.slot == proposer_duty.slot and \
not is_slashable_block(slashing_db, block, proposer_duty.pubkey)


def consensus_on_block(slashing_db: SlashingDB, proposer_duty: ProposerDuty) -> AttestationData:
Expand All @@ -57,6 +60,7 @@ def consensus_on_block(slashing_db: SlashingDB, proposer_duty: ProposerDuty) ->
The consensus protocol must use `consensus_is_valid_block` to determine
validity of the proposed block value.
"""
Ensures(consensus_is_valid_block(slashing_db, Result(), proposer_duty));
pass


Expand All @@ -75,4 +79,5 @@ def consensus_on_sync_committee_contribution(sync_committee_duty: SyncCommitteeD
The consensus protocol must use `consensus_is_valid_sync_committee_contribution` to determine
validity of the proposed block value.
"""
Ensures(consensus_is_valid_sync_committee_contribution(sync_committee_duty, Result()));
pass