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signed wrapper (#1283)

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* add signed wrapper, typedef SignedStatement

* typedef SignedAvailabilityBitfield

* implement Signed wrapper

This is strictly an addition as of this commit; nothing is yet
changed in existing behavior.

* inline getters, remove review comment

* move EncodeAs, Signed from node::primitives to primitives::parachain

* Refactor SignedAvailabilityBitfield to use Signed

* don't double-encode real payload

This isn't an ideal solution, because it depends on the
implementation details of how SCALE encodes tuples, but OTOH
that behavior seems unlikely to change anytime soon.

* fix build errors

* cause the runtime to build properly with the new changes

Not sure why cargo check didn't catch this earlier; oh well.

* fix runtime tests and separate SignedStatement from SignedFullStatement

* better explain why CompactStatement exists

Co-authored-by: Robert Habermeier <rphmeier@gmail.com>

Co-authored-by: Robert Habermeier <rphmeier@gmail.com>
This commit is contained in:
Peter Goodspeed-Niklaus
2020-06-20 20:56:33 +02:00
committed by GitHub
parent 90a1ba1e90
commit 14ce04c9cd
12 changed files with 236 additions and 194 deletions
Download Patch File Download Diff File Expand all files Collapse all files
polkadot/runtime/parachains/src/inclusion.rs
+27 -31
View File
@@ -184,7 +184,6 @@ impl<T: Trait> Module<T> {
.collect();
let mut last_index = None;
let mut payload_encode_buf = Vec::new();
let signing_context = SigningContext {
parent_hash: <system::Module<T>>::parent_hash(),
@@ -193,46 +192,37 @@ impl<T: Trait> Module<T> {
for signed_bitfield in &signed_bitfields.0 {
ensure!(
signed_bitfield.bitfield.0.len() == n_bits,
signed_bitfield.payload().0.len() == n_bits,
Error::<T>::WrongBitfieldSize,
);
ensure!(
last_index.map_or(true, |last| last < signed_bitfield.validator_index),
last_index.map_or(true, |last| last < signed_bitfield.validator_index()),
Error::<T>::BitfieldDuplicateOrUnordered,
);
ensure!(
signed_bitfield.validator_index < validators.len() as ValidatorIndex,
signed_bitfield.validator_index() < validators.len() as ValidatorIndex,
Error::<T>::ValidatorIndexOutOfBounds,
);
ensure!(
occupied_bitmask.clone() & signed_bitfield.bitfield.0.clone() == signed_bitfield.bitfield.0,
occupied_bitmask.clone() & signed_bitfield.payload().0.clone() == signed_bitfield.payload().0,
Error::<T>::UnoccupiedBitInBitfield,
);
let validator_public = &validators[signed_bitfield.validator_index as usize];
let validator_public = &validators[signed_bitfield.validator_index() as usize];
if let Err(()) = primitives::parachain::check_availability_bitfield_signature(
&signed_bitfield.bitfield,
validator_public,
&signed_bitfield.signature,
&signing_context,
Some(&mut payload_encode_buf),
) {
Err(Error::<T>::InvalidBitfieldSignature)?;
}
signed_bitfield.check_signature(&signing_context, validator_public).map_err(|_| Error::<T>::InvalidBitfieldSignature)?;
last_index = Some(signed_bitfield.validator_index);
payload_encode_buf.clear();
last_index = Some(signed_bitfield.validator_index());
}
}
let now = <system::Module<T>>::block_number();
for signed_bitfield in signed_bitfields.0 {
for (bit_idx, _)
in signed_bitfield.bitfield.0.iter().enumerate().filter(|(_, is_av)| **is_av)
in signed_bitfield.payload().0.iter().enumerate().filter(|(_, is_av)| **is_av)
{
let record = assigned_paras_record[bit_idx]
.as_mut()
@@ -240,7 +230,7 @@ impl<T: Trait> Module<T> {
// defensive check - this is constructed by loading the availability bitfield record,
// which is always `Some` if the core is occupied - that's why we're here.
let val_idx = signed_bitfield.validator_index as usize;
let val_idx = signed_bitfield.validator_index() as usize;
if let Some(mut bit) = record.1.as_mut()
.and_then(|r| r.availability_votes.get_mut(val_idx))
{
@@ -250,12 +240,13 @@ impl<T: Trait> Module<T> {
}
}
let validator_index = signed_bitfield.validator_index();
let record = AvailabilityBitfieldRecord {
bitfield: signed_bitfield.bitfield,
bitfield: signed_bitfield.into_payload(),
submitted_at: now,
};
<AvailabilityBitfields<T>>::insert(&signed_bitfield.validator_index, record);
<AvailabilityBitfields<T>>::insert(&validator_index, record);
}
let threshold = availability_threshold(validators.len());
@@ -506,8 +497,8 @@ mod tests {
use primitives::{BlockNumber, Hash};
use primitives::parachain::{
SignedAvailabilityBitfield, Statement, ValidityAttestation, CollatorId,
CandidateCommitments,
SignedAvailabilityBitfield, CompactStatement as Statement, ValidityAttestation, CollatorId,
CandidateCommitments, SignedStatement,
};
use frame_support::traits::{OnFinalize, OnInitialize};
use keyring::Sr25519Keyring;
@@ -587,13 +578,19 @@ mod tests {
let mut validity_votes = Vec::with_capacity(signing);
let candidate_hash = candidate.hash();
let payload = Statement::Valid(candidate_hash).signing_payload(signing_context);
for (idx_in_group, val_idx) in group.iter().enumerate().take(signing) {
let key: Sr25519Keyring = validators[*val_idx as usize];
*validator_indices.get_mut(idx_in_group).unwrap() = true;
validity_votes.push(ValidityAttestation::Explicit(key.sign(&payload[..]).into()));
let signature = SignedStatement::sign(
Statement::Valid(candidate_hash),
signing_context,
*val_idx,
&key.pair().into(),
).signature().clone();
validity_votes.push(ValidityAttestation::Explicit(signature).into());
}
let backed = BackedCandidate {
@@ -670,13 +667,12 @@ mod tests {
)
-> SignedAvailabilityBitfield
{
let payload = bitfield.encode_signing_payload(signing_context);
SignedAvailabilityBitfield {
SignedAvailabilityBitfield::sign(
bitfield,
&signing_context,
validator_index,
bitfield: bitfield,
signature: key.sign(&payload[..]).into(),
}
&key.pair().into(),
)
}
#[test]