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babe: make secondary slot randomness available on-chain (#7053)

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* babe: make secondary slot randomness available on-chain

* babe: extract out vrf_output function

* babe: add missing comment

* babe: fix incorrectly storing primary randomness

* babe: add test for onchain author vrf

* babe: fix reviewer nits

* runtime: bump spec_version

* babe: remove outer Option for AuthorVrfRandomness

* babe: fix reviewer nits on doc strings

* babe: move make_vrf_output to mock.rs

* babe: cleanup docs

* babe: kill ephemeral entry instead of take

* babe: use type alias for maybe randomness

Co-authored-by: André Silva <andrerfosilva@gmail.com>
This commit is contained in:
Jon Häggblad
2020-10-15 10:32:12 +02:00
committed by GitHub
parent 1164ced041
commit a297e447f2
5 changed files with 173 additions and 47 deletions
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substrate/frame/babe/src/mock.rs
+34 -1
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@@ -32,7 +32,7 @@ use frame_support::{
weights::Weight,
};
use sp_io;
use sp_core::{H256, U256, crypto::{KeyTypeId, Pair}};
use sp_core::{H256, U256, crypto::{IsWrappedBy, KeyTypeId, Pair}};
use sp_consensus_babe::{AuthorityId, AuthorityPair, SlotNumber};
use sp_consensus_vrf::schnorrkel::{VRFOutput, VRFProof};
use sp_staking::SessionIndex;
@@ -330,6 +330,39 @@ pub fn make_secondary_plain_pre_digest(
Digest { logs: vec![log] }
}
pub fn make_secondary_vrf_pre_digest(
authority_index: sp_consensus_babe::AuthorityIndex,
slot_number: sp_consensus_babe::SlotNumber,
vrf_output: VRFOutput,
vrf_proof: VRFProof,
) -> Digest {
let digest_data = sp_consensus_babe::digests::PreDigest::SecondaryVRF(
sp_consensus_babe::digests::SecondaryVRFPreDigest {
authority_index,
slot_number,
vrf_output,
vrf_proof,
}
);
let log = DigestItem::PreRuntime(sp_consensus_babe::BABE_ENGINE_ID, digest_data.encode());
Digest { logs: vec![log] }
}
pub fn make_vrf_output(
slot_number: u64,
pair: &sp_consensus_babe::AuthorityPair
) -> (VRFOutput, VRFProof, [u8; 32]) {
let pair = sp_core::sr25519::Pair::from_ref(pair).as_ref();
let transcript = sp_consensus_babe::make_transcript(&Babe::randomness(), slot_number, 0);
let vrf_inout = pair.vrf_sign(transcript);
let vrf_randomness: sp_consensus_vrf::schnorrkel::Randomness = vrf_inout.0
.make_bytes::<[u8; 32]>(&sp_consensus_babe::BABE_VRF_INOUT_CONTEXT);
let vrf_output = VRFOutput(vrf_inout.0.to_output());
let vrf_proof = VRFProof(vrf_inout.1);
(vrf_output, vrf_proof, vrf_randomness)
}
pub fn new_test_ext(authorities_len: usize) -> sp_io::TestExternalities {
new_test_ext_with_pairs(authorities_len).1
}