Publish SlashReport onto the Tributary

coordinator/tributary/src/db.rs

@@ -184,8 +184,8 @@ create_db!(
     // The last handled tributary block's (number, hash)
     LastHandledTributaryBlock: (set: ValidatorSet) -> (u64, [u8; 32]),
 
-    // The slash points a validator has accrued, with u64::MAX representing a fatal slash.
-    SlashPoints: (set: ValidatorSet, validator: SeraiAddress) -> u64,
+    // The slash points a validator has accrued, with u32::MAX representing a fatal slash.
+    SlashPoints: (set: ValidatorSet, validator: SeraiAddress) -> u32,
 
     // The latest Substrate block to cosign.
     LatestSubstrateBlockToCosign: (set: ValidatorSet) -> [u8; 32],
@@ -316,7 +316,7 @@ impl TributaryDb {
     reason: &str,
   ) {
     log::warn!("{validator} fatally slashed: {reason}");
-    SlashPoints::set(txn, set, validator, &u64::MAX);
+    SlashPoints::set(txn, set, validator, &u32::MAX);
   }
 
   pub(crate) fn is_fatally_slashed(
@@ -324,7 +324,7 @@ impl TributaryDb {
     set: ValidatorSet,
     validator: SeraiAddress,
   ) -> bool {
-    SlashPoints::get(getter, set, validator).unwrap_or(0) == u64::MAX
+    SlashPoints::get(getter, set, validator).unwrap_or(0) == u32::MAX
   }
 
   #[allow(clippy::too_many_arguments)]

coordinator/tributary/src/lib.rs

@@ -511,3 +511,13 @@ impl<CD: Db, TD: Db, P: P2p> ContinuallyRan for ScanTributaryTask<CD, TD, P> {
     }
   }
 }
+
+/// Create the Transaction::SlashReport to publish per the local view.
+pub fn slash_report_transaction(getter: &impl Get, set: &NewSetInformation) -> Transaction {
+  let mut slash_points = Vec::with_capacity(set.validators.len());
+  for (validator, _weight) in set.validators.iter().copied() {
+    let validator = SeraiAddress::from(validator);
+    slash_points.push(SlashPoints::get(getter, set.set, validator).unwrap_or(0));
+  }
+  Transaction::SlashReport { slash_points, signed: Signed::default() }
+}

coordinator/tributary/src/transaction.rs

@@ -6,7 +6,7 @@ use rand_core::{RngCore, CryptoRng};
 
 use blake2::{digest::typenum::U32, Digest, Blake2b};
 use ciphersuite::{
-  group::{ff::Field, GroupEncoding},
+  group::{ff::Field, Group, GroupEncoding},
   Ciphersuite, Ristretto,
 };
 use schnorr::SchnorrSignature;
@@ -80,6 +80,18 @@ impl Signed {
   }
 }
 
+impl Default for Signed {
+  fn default() -> Self {
+    Self {
+      signer: <Ristretto as Ciphersuite>::G::identity(),
+      signature: SchnorrSignature {
+        R: <Ristretto as Ciphersuite>::G::identity(),
+        s: <Ristretto as Ciphersuite>::F::ZERO,
+      },
+    }
+  }
+}
+
 /// The Tributary transaction definition used by Serai
 #[derive(Clone, PartialEq, Eq, Debug, BorshSerialize, BorshDeserialize)]
 pub enum Transaction {