Spawn PublishSlashReportTask

Updates it so that it'll try for every network instead of returning after any
network fails.

Uses the SlashReport type throughout the codebase.

coordinator/src/main.rs

@@ -14,7 +14,7 @@ use borsh::BorshDeserialize;
 use tokio::sync::mpsc;
 
 use serai_client::{
-  primitives::{NetworkId, PublicKey},
+  primitives::{NetworkId, PublicKey, Signature},
   validator_sets::primitives::ValidatorSet,
   Serai,
 };
@@ -25,6 +25,7 @@ use serai_task::{Task, TaskHandle, ContinuallyRan};
 use serai_cosign::{Faulted, SignedCosign, Cosigning};
 use serai_coordinator_substrate::{
   CanonicalEventStream, EphemeralEventStream, SignSlashReport, SignedBatches, PublishBatchTask,
+  SlashReports, PublishSlashReportTask,
 };
 use serai_coordinator_tributary::{SigningProtocolRound, Signed, Transaction, SubstrateBlockPlans};
 
@@ -161,6 +162,7 @@ async fn handle_network(
         .unwrap()
         .continually_run(publish_batch_task_def, vec![]),
     );
+    // Forget its handle so it always runs in the background
     core::mem::forget(publish_batch_task);
   }
 
@@ -274,8 +276,17 @@ async fn handle_network(
         messages::coordinator::ProcessorMessage::SignedBatch { batch } => {
           SignedBatches::send(&mut txn, &batch);
         }
-        messages::coordinator::ProcessorMessage::SignedSlashReport { session, signature } => {
-          todo!("TODO PublishSlashReportTask")
+        messages::coordinator::ProcessorMessage::SignedSlashReport {
+          session,
+          slash_report,
+          signature,
+        } => {
+          SlashReports::set(
+            &mut txn,
+            ValidatorSet { network, session },
+            slash_report,
+            Signature(signature),
+          );
         }
       },
       messages::ProcessorMessage::Substrate(msg) => match msg {
@@ -472,6 +483,16 @@ async fn main() {
     tokio::spawn(handle_network(db.clone(), message_queue.clone(), serai.clone(), network));
   }
 
+  // Spawn the task to publish slash reports
+  {
+    let (publish_slash_report_task_def, publish_slash_report_task) = Task::new();
+    tokio::spawn(
+      PublishSlashReportTask::new(db, serai).continually_run(publish_slash_report_task_def, vec![]),
+    );
+    // Always have this run in the background
+    core::mem::forget(publish_slash_report_task);
+  }
+
   // Run the spawned tasks ad-infinitum
   core::future::pending().await
 }

coordinator/substrate/src/lib.rs

@@ -6,8 +6,8 @@ use scale::{Encode, Decode};
 use borsh::{io, BorshSerialize, BorshDeserialize};
 
 use serai_client::{
-  primitives::{NetworkId, PublicKey, Signature, SeraiAddress},
-  validator_sets::primitives::{Session, ValidatorSet, KeyPair},
+  primitives::{NetworkId, PublicKey, Signature},
+  validator_sets::primitives::{Session, ValidatorSet, KeyPair, SlashReport},
   in_instructions::primitives::SignedBatch,
   Transaction,
 };
@@ -183,10 +183,6 @@ impl SignedBatches {
   }
 }
 
-/// The slash report was invalid.
-#[derive(Debug)]
-pub struct InvalidSlashReport;
-
 /// The slash reports to publish onto Serai.
 pub struct SlashReports;
 impl SlashReports {
@@ -194,30 +190,25 @@ impl SlashReports {
   ///
   /// This only saves the most recent slashes as only a single session is eligible to have its
   /// slashes reported at once.
-  ///
-  /// Returns Err if the slashes are invalid. Returns Ok if the slashes weren't detected as
-  /// invalid. Slashes may be considered invalid by the Serai blockchain later even if not detected
-  /// as invalid here.
   pub fn set(
     txn: &mut impl DbTxn,
     set: ValidatorSet,
-    slashes: Vec<(SeraiAddress, u32)>,
+    slash_report: SlashReport,
     signature: Signature,
-  ) -> Result<(), InvalidSlashReport> {
+  ) {
     // If we have a more recent slash report, don't write this historic one
     if let Some((existing_session, _)) = _public_db::SlashReports::get(txn, set.network) {
       if existing_session.0 >= set.session.0 {
-        return Ok(());
+        return;
       }
     }
 
     let tx = serai_client::validator_sets::SeraiValidatorSets::report_slashes(
       set.network,
-      slashes.try_into().map_err(|_| InvalidSlashReport)?,
+      slash_report,
       signature,
     );
     _public_db::SlashReports::set(txn, set.network, &(set.session, tx.encode()));
-    Ok(())
   }
   pub(crate) fn take(txn: &mut impl DbTxn, network: NetworkId) -> Option<(Session, Transaction)> {
     let (session, tx) = _public_db::SlashReports::take(txn, network)?;

coordinator/substrate/src/publish_slash_report.rs

@@ -22,66 +22,80 @@ impl<D: Db> PublishSlashReportTask<D> {
   }
 }
 
+impl<D: Db> PublishSlashReportTask<D> {
+  // Returns if a slash report was successfully published
+  async fn publish(&mut self, network: NetworkId) -> Result<bool, String> {
+    let mut txn = self.db.txn();
+    let Some((session, slash_report)) = SlashReports::take(&mut txn, network) else {
+      // No slash report to publish
+      return Ok(false);
+    };
+
+    let serai = self.serai.as_of_latest_finalized_block().await.map_err(|e| format!("{e:?}"))?;
+    let serai = serai.validator_sets();
+    let session_after_slash_report = Session(session.0 + 1);
+    let current_session = serai.session(network).await.map_err(|e| format!("{e:?}"))?;
+    let current_session = current_session.map(|session| session.0);
+    // Only attempt to publish the slash report for session #n while session #n+1 is still
+    // active
+    let session_after_slash_report_retired = current_session > Some(session_after_slash_report.0);
+    if session_after_slash_report_retired {
+      // Commit the txn to drain this slash report from the database and not try it again later
+      txn.commit();
+      return Ok(false);
+    }
+
+    if Some(session_after_slash_report.0) != current_session {
+      // We already checked the current session wasn't greater, and they're not equal
+      assert!(current_session < Some(session_after_slash_report.0));
+      // This would mean the Serai node is resyncing and is behind where it prior was
+      Err("have a slash report for a session Serai has yet to retire".to_string())?;
+    }
+
+    // If this session which should publish a slash report already has, move on
+    let key_pending_slash_report =
+      serai.key_pending_slash_report(network).await.map_err(|e| format!("{e:?}"))?;
+    if key_pending_slash_report.is_none() {
+      txn.commit();
+      return Ok(false);
+    };
+
+    match self.serai.publish(&slash_report).await {
+      Ok(()) => {
+        txn.commit();
+        Ok(true)
+      }
+      // This could be specific to this TX (such as an already in mempool error) and it may be
+      // worthwhile to continue iteration with the other pending slash reports. We assume this
+      // error ephemeral and that the latency incurred for this ephemeral error to resolve is
+      // miniscule compared to the window available to publish the slash report. That makes
+      // this a non-issue.
+      Err(e) => Err(format!("couldn't publish slash report transaction: {e:?}")),
+    }
+  }
+}
+
 impl<D: Db> ContinuallyRan for PublishSlashReportTask<D> {
   type Error = String;
 
   fn run_iteration(&mut self) -> impl Send + Future<Output = Result<bool, Self::Error>> {
     async move {
       let mut made_progress = false;
+      let mut error = None;
       for network in serai_client::primitives::NETWORKS {
         if network == NetworkId::Serai {
           continue;
         };
 
-        let mut txn = self.db.txn();
-        let Some((session, slash_report)) = SlashReports::take(&mut txn, network) else {
-          // No slash report to publish
-          continue;
-        };
-
-        let serai =
-          self.serai.as_of_latest_finalized_block().await.map_err(|e| format!("{e:?}"))?;
-        let serai = serai.validator_sets();
-        let session_after_slash_report = Session(session.0 + 1);
-        let current_session = serai.session(network).await.map_err(|e| format!("{e:?}"))?;
-        let current_session = current_session.map(|session| session.0);
-        // Only attempt to publish the slash report for session #n while session #n+1 is still
-        // active
-        let session_after_slash_report_retired =
-          current_session > Some(session_after_slash_report.0);
-        if session_after_slash_report_retired {
-          // Commit the txn to drain this slash report from the database and not try it again later
-          txn.commit();
-          continue;
-        }
-
-        if Some(session_after_slash_report.0) != current_session {
-          // We already checked the current session wasn't greater, and they're not equal
-          assert!(current_session < Some(session_after_slash_report.0));
-          // This would mean the Serai node is resyncing and is behind where it prior was
-          Err("have a slash report for a session Serai has yet to retire".to_string())?;
-        }
-
-        // If this session which should publish a slash report already has, move on
-        let key_pending_slash_report =
-          serai.key_pending_slash_report(network).await.map_err(|e| format!("{e:?}"))?;
-        if key_pending_slash_report.is_none() {
-          txn.commit();
-          continue;
-        };
-
-        match self.serai.publish(&slash_report).await {
-          Ok(()) => {
-            txn.commit();
-            made_progress = true;
-          }
-          // This could be specific to this TX (such as an already in mempool error) and it may be
-          // worthwhile to continue iteration with the other pending slash reports. We assume this
-          // error ephemeral and that the latency incurred for this ephemeral error to resolve is
-          // miniscule compared to the window available to publish the slash report. That makes
-          // this a non-issue.
-          Err(e) => Err(format!("couldn't publish slash report transaction: {e:?}"))?,
-        }
+        let network_res = self.publish(network).await;
+        // We made progress if any network successfully published their slash report
+        made_progress |= network_res == Ok(true);
+        // We want to yield the first error *after* attempting for every network
+        error = error.or(network_res.err());
+      }
+      // Yield the error
+      if let Some(error) = error {
+        Err(error)?
       }
       Ok(made_progress)
     }

coordinator/tributary/src/lib.rs

@@ -371,7 +371,7 @@ impl<'a, TD: Db, TDT: DbTxn, P: P2p> ScanBlock<'a, TD, TDT, P> {
 
             // Create the resulting slash report
             let mut slash_report = vec![];
-            for (_, points) in self.validators.iter().copied().zip(amortized_slash_report) {
+            for points in amortized_slash_report {
               // TODO: Natively store this as a `Slash`
               if points == u32::MAX {
                 slash_report.push(Slash::Fatal);
@@ -397,7 +397,7 @@ impl<'a, TD: Db, TDT: DbTxn, P: P2p> ScanBlock<'a, TD, TDT, P> {
               self.set,
               messages::coordinator::CoordinatorMessage::SignSlashReport {
                 session: self.set.session,
-                report: slash_report,
+                slash_report: slash_report.try_into().unwrap(),
               },
             );
           }

processor/messages/src/lib.rs

@@ -7,7 +7,7 @@ use borsh::{BorshSerialize, BorshDeserialize};
 use dkg::Participant;
 
 use serai_primitives::BlockHash;
-use validator_sets_primitives::{Session, KeyPair, Slash};
+use validator_sets_primitives::{Session, KeyPair, SlashReport};
 use coins_primitives::OutInstructionWithBalance;
 use in_instructions_primitives::SignedBatch;
 
@@ -100,7 +100,9 @@ pub mod sign {
         Self::Cosign(cosign) => {
           f.debug_struct("VariantSignId::Cosign").field("0", &cosign).finish()
         }
-        Self::Batch(batch) => f.debug_struct("VariantSignId::Batch").field("0", &batch).finish(),
+        Self::Batch(batch) => {
+          f.debug_struct("VariantSignId::Batch").field("0", &hex::encode(batch)).finish()
+        }
         Self::SlashReport => f.debug_struct("VariantSignId::SlashReport").finish(),
         Self::Transaction(tx) => {
           f.debug_struct("VariantSignId::Transaction").field("0", &hex::encode(tx)).finish()
@@ -168,7 +170,7 @@ pub mod coordinator {
     /// Sign the slash report for this session.
     ///
     /// This is sent by the Coordinator's Tributary scanner.
-    SignSlashReport { session: Session, report: Vec<Slash> },
+    SignSlashReport { session: Session, slash_report: SlashReport },
   }
 
   // This set of messages is sent entirely and solely by serai-processor-bin's implementation of
@@ -178,7 +180,7 @@ pub mod coordinator {
   pub enum ProcessorMessage {
     CosignedBlock { cosign: SignedCosign },
     SignedBatch { batch: SignedBatch },
-    SignedSlashReport { session: Session, signature: Vec<u8> },
+    SignedSlashReport { session: Session, slash_report: SlashReport, signature: [u8; 64] },
   }
 }
 

substrate/abi/src/validator_sets.rs

@@ -21,7 +21,7 @@ pub enum Call {
   },
   report_slashes {
     network: NetworkId,
-    slashes: BoundedVec<(SeraiAddress, u32), ConstU32<{ MAX_KEY_SHARES_PER_SET_U32 / 3 }>>,
+    slashes: SlashReport,
     signature: Signature,
   },
   allocate {

substrate/client/src/serai/validator_sets.rs

@@ -5,10 +5,10 @@ use sp_runtime::BoundedVec;
 
 use serai_abi::primitives::Amount;
 pub use serai_abi::validator_sets::primitives;
-use primitives::{MAX_KEY_LEN, Session, ValidatorSet, KeyPair};
+use primitives::{MAX_KEY_LEN, Session, ValidatorSet, KeyPair, SlashReport};
 
 use crate::{
-  primitives::{EmbeddedEllipticCurve, NetworkId, SeraiAddress},
+  primitives::{EmbeddedEllipticCurve, NetworkId},
   Transaction, Serai, TemporalSerai, SeraiError,
 };
 
@@ -238,12 +238,7 @@ impl<'a> SeraiValidatorSets<'a> {
 
   pub fn report_slashes(
     network: NetworkId,
-    // TODO: This bounds a maximum length but takes more space than just publishing all the u32s
-    // (50 * (32 + 4)) > (150 * 4)
-    slashes: sp_runtime::BoundedVec<
-      (SeraiAddress, u32),
-      sp_core::ConstU32<{ primitives::MAX_KEY_SHARES_PER_SET_U32 / 3 }>,
-    >,
+    slashes: SlashReport,
     signature: Signature,
   ) -> Transaction {
     Serai::unsigned(serai_abi::Call::ValidatorSets(

substrate/runtime/src/abi.rs

@@ -111,13 +111,7 @@ impl From<Call> for RuntimeCall {
         serai_abi::validator_sets::Call::report_slashes { network, slashes, signature } => {
           RuntimeCall::ValidatorSets(validator_sets::Call::report_slashes {
             network,
-            slashes: <_>::try_from(
-              slashes
-                .into_iter()
-                .map(|(addr, slash)| (PublicKey::from(addr), slash))
-                .collect::<Vec<_>>(),
-            )
-            .unwrap(),
+            slashes,
             signature,
           })
         }
@@ -301,17 +295,7 @@ impl TryInto<Call> for RuntimeCall {
           }
         }
         validator_sets::Call::report_slashes { network, slashes, signature } => {
-          serai_abi::validator_sets::Call::report_slashes {
-            network,
-            slashes: <_>::try_from(
-              slashes
-                .into_iter()
-                .map(|(addr, slash)| (SeraiAddress::from(addr), slash))
-                .collect::<Vec<_>>(),
-            )
-            .unwrap(),
-            signature,
-          }
+          serai_abi::validator_sets::Call::report_slashes { network, slashes, signature }
         }
         validator_sets::Call::allocate { network, amount } => {
           serai_abi::validator_sets::Call::allocate { network, amount }

substrate/validator-sets/pallet/src/lib.rs

@@ -1010,7 +1010,7 @@ pub mod pallet {
     pub fn report_slashes(
       origin: OriginFor<T>,
       network: NetworkId,
-      slashes: BoundedVec<(Public, u32), ConstU32<{ MAX_KEY_SHARES_PER_SET_U32 / 3 }>>,
+      slashes: SlashReport,
       signature: Signature,
     ) -> DispatchResult {
       ensure_none(origin)?;

substrate/validator-sets/primitives/src/slash_points.rs

@@ -210,6 +210,30 @@ impl Slash {
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
 pub struct SlashReport(pub BoundedVec<Slash, ConstU32<{ MAX_KEY_SHARES_PER_SET_U32 }>>);
 
+#[cfg(feature = "borsh")]
+impl BorshSerialize for SlashReport {
+  fn serialize<W: borsh::io::Write>(&self, writer: &mut W) -> borsh::io::Result<()> {
+    BorshSerialize::serialize(self.0.as_slice(), writer)
+  }
+}
+#[cfg(feature = "borsh")]
+impl BorshDeserialize for SlashReport {
+  fn deserialize_reader<R: borsh::io::Read>(reader: &mut R) -> borsh::io::Result<Self> {
+    let slashes = Vec::<Slash>::deserialize_reader(reader)?;
+    slashes
+      .try_into()
+      .map(Self)
+      .map_err(|_| borsh::io::Error::other("length of slash report exceeds max validators"))
+  }
+}
+
+impl TryFrom<Vec<Slash>> for SlashReport {
+  type Error = &'static str;
+  fn try_from(slashes: Vec<Slash>) -> Result<SlashReport, &'static str> {
+    slashes.try_into().map(Self).map_err(|_| "length of slash report exceeds max validators")
+  }
+}
+
 // This is assumed binding to the ValidatorSet via the key signed with
 pub fn report_slashes_message(slashes: &SlashReport) -> Vec<u8> {
   (b"ValidatorSets-report_slashes", slashes).encode()