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add helper in p2p document to executable spec

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Alex Stokes 2021-04-15 11:46:44 -07:00
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specs/altair/p2p-interface.md
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@ -86,11 +86,10 @@ This topic is used to propagate partially aggregated sync committee signatures t
The following validations MUST pass before forwarding the `signed_contribution_and_proof` on the network; define `contribution_and_proof = signed_contribution_and_proof.message`, `contribution = contribution_and_proof.contribution`, and the following function `get_sync_subcommittee_pubkeys` for convenience: The following validations MUST pass before forwarding the `signed_contribution_and_proof` on the network; define `contribution_and_proof = signed_contribution_and_proof.message`, `contribution = contribution_and_proof.contribution`, and the following function `get_sync_subcommittee_pubkeys` for convenience:
```python ```python
SYNC_SUBCOMMITTEE_SIZE = SYNC_COMMITTEE_SIZE // SYNC_COMMITTEE_SUBNET_COUNT
def get_sync_subcommittee_pubkeys(state: BeaconState, subcommittee_index: uint64) -> Sequence[BLSPubkey]: def get_sync_subcommittee_pubkeys(state: BeaconState, subcommittee_index: uint64) -> Sequence[BLSPubkey]:
i = subcommittee_index * SYNC_SUBCOMMITTEE_SIZE sync_subcommittee_size = SYNC_COMMITTEE_SIZE // SYNC_COMMITTEE_SUBNET_COUNT
return state.current_sync_committee.pubkeys[i:i+SYNC_SUBCOMMITTEE_SIZE] i = subcommittee_index * sync_subcommittee_size
return state.current_sync_committee.pubkeys[i:i + sync_subcommittee_size]
``` ```
- _[IGNORE]_ The contribution's slot is for the current slot, i.e. `contribution.slot == current_slot`. - _[IGNORE]_ The contribution's slot is for the current slot, i.e. `contribution.slot == current_slot`.