Provisioner should ignore unconfirmed disputes (#6294)

* Fix typos

* Filter unconfirmed disputes in provisioner -  random_selection

* Rework dispute coordinator to return `DisputeStatus` with
`ActiveDisputes` message.
* Rework the random_selection implementation of `select_disptues` in
  `provisioner` to return only confirmed disputes.

* Filter unconfirmed disputes in provisioner - prioritized_selection

* Add test for unconfirmed disputes handling

* Fix `dispute-distribution` tests

polkadot/node/core/provisioner/src/disputes/prioritized_selection/mod.rs

@@ -139,6 +139,13 @@ where
 		onchain.len(),
 	);
 
+	// Filter out unconfirmed disputes. However if the dispute is already onchain - don't skip it.
+	// In this case we'd better push as much fresh votes as possible to bring it to conclusion faster.
+	let recent_disputes = recent_disputes
+		.into_iter()
+		.filter(|d| d.2.is_confirmed_concluded() || onchain.contains_key(&(d.0, d.1)))
+		.collect::<Vec<_>>();
+
 	let partitioned = partition_recent_disputes(recent_disputes, &onchain);
 	metrics.on_partition_recent_disputes(&partitioned);
 

polkadot/node/core/provisioner/src/disputes/prioritized_selection/tests.rs

@@ -426,7 +426,7 @@ impl TestDisputes {
 	pub fn add_unconfirmed_disputes_concluded_onchain(
 		&mut self,
 		dispute_count: usize,
-	) -> (u32, usize) {
+	) -> (SessionIndex, usize) {
 		let local_votes_count = self.validators_count * 90 / 100;
 		let onchain_votes_count = self.validators_count * 80 / 100;
 		let session_idx = 0;
@@ -444,7 +444,7 @@ impl TestDisputes {
 	pub fn add_unconfirmed_disputes_unconcluded_onchain(
 		&mut self,
 		dispute_count: usize,
-	) -> (u32, usize) {
+	) -> (SessionIndex, usize) {
 		let local_votes_count = self.validators_count * 90 / 100;
 		let onchain_votes_count = self.validators_count * 40 / 100;
 		let session_idx = 1;
@@ -459,22 +459,25 @@ impl TestDisputes {
 		(session_idx, (local_votes_count - onchain_votes_count) * dispute_count)
 	}
 
-	pub fn add_unconfirmed_disputes_unknown_onchain(
+	pub fn add_confirmed_disputes_unknown_onchain(
 		&mut self,
 		dispute_count: usize,
-	) -> (u32, usize) {
+	) -> (SessionIndex, usize) {
 		let local_votes_count = self.validators_count * 90 / 100;
 		let session_idx = 2;
 		let lf = leaf();
 		let dummy_receipt = test_helpers::dummy_candidate_receipt(lf.hash.clone());
 		for _ in 0..dispute_count {
-			let d = (session_idx, CandidateHash(Hash::random()), DisputeStatus::Active);
+			let d = (session_idx, CandidateHash(Hash::random()), DisputeStatus::Confirmed);
 			self.add_offchain_dispute(d.clone(), local_votes_count, dummy_receipt.clone());
 		}
 		(session_idx, local_votes_count * dispute_count)
 	}
 
-	pub fn add_concluded_disputes_known_onchain(&mut self, dispute_count: usize) -> (u32, usize) {
+	pub fn add_concluded_disputes_known_onchain(
+		&mut self,
+		dispute_count: usize,
+	) -> (SessionIndex, usize) {
 		let local_votes_count = self.validators_count * 90 / 100;
 		let onchain_votes_count = self.validators_count * 75 / 100;
 		let session_idx = 3;
@@ -488,7 +491,10 @@ impl TestDisputes {
 		(session_idx, (local_votes_count - onchain_votes_count) * dispute_count)
 	}
 
-	pub fn add_concluded_disputes_unknown_onchain(&mut self, dispute_count: usize) -> (u32, usize) {
+	pub fn add_concluded_disputes_unknown_onchain(
+		&mut self,
+		dispute_count: usize,
+	) -> (SessionIndex, usize) {
 		let local_votes_count = self.validators_count * 90 / 100;
 		let session_idx = 4;
 		let lf = leaf();
@@ -500,6 +506,40 @@ impl TestDisputes {
 		(session_idx, local_votes_count * dispute_count)
 	}
 
+	pub fn add_unconfirmed_disputes_known_onchain(
+		&mut self,
+		dispute_count: usize,
+	) -> (SessionIndex, usize) {
+		let local_votes_count = self.validators_count * 10 / 100;
+		let onchain_votes_count = self.validators_count * 10 / 100;
+		let session_idx = 5;
+		let lf = leaf();
+		let dummy_receipt = test_helpers::dummy_candidate_receipt(lf.hash.clone());
+		for _ in 0..dispute_count {
+			let d = (session_idx, CandidateHash(Hash::random()), DisputeStatus::Active);
+			self.add_offchain_dispute(d.clone(), local_votes_count, dummy_receipt.clone());
+			self.add_onchain_dispute(d, onchain_votes_count);
+		}
+
+		(session_idx, (local_votes_count - onchain_votes_count) * dispute_count)
+	}
+
+	pub fn add_unconfirmed_disputes_unknown_onchain(
+		&mut self,
+		dispute_count: usize,
+	) -> (SessionIndex, usize) {
+		let local_votes_count = self.validators_count * 10 / 100;
+		let session_idx = 6;
+		let lf = leaf();
+		let dummy_receipt = test_helpers::dummy_candidate_receipt(lf.hash.clone());
+		for _ in 0..dispute_count {
+			let d = (session_idx, CandidateHash(Hash::random()), DisputeStatus::Active);
+			self.add_offchain_dispute(d.clone(), local_votes_count, dummy_receipt.clone());
+		}
+
+		(session_idx, local_votes_count * dispute_count)
+	}
+
 	fn generate_local_votes<T: Clone>(
 		statement_kind: T,
 		start_idx: usize,
@@ -554,9 +594,9 @@ fn normal_flow() {
 	// concluded disputes known onchain - these should be ignored
 	let (_, _) = input.add_concluded_disputes_known_onchain(DISPUTES_PER_BATCH);
 
-	// active disputes unknown onchain
+	// confirmed disputes unknown onchain
 	let (second_idx, second_votes) =
-		input.add_unconfirmed_disputes_unknown_onchain(DISPUTES_PER_BATCH);
+		input.add_confirmed_disputes_unknown_onchain(DISPUTES_PER_BATCH);
 
 	let metrics = metrics::Metrics::new_dummy();
 	let mut vote_queries: usize = 0;
@@ -635,8 +675,8 @@ fn many_batches() {
 	// concluded disputes known onchain
 	input.add_concluded_disputes_known_onchain(DISPUTES_PER_PARTITION);
 
-	// active disputes unknown onchain
-	input.add_unconfirmed_disputes_unknown_onchain(DISPUTES_PER_PARTITION);
+	// confirmed disputes unknown onchain
+	input.add_confirmed_disputes_unknown_onchain(DISPUTES_PER_PARTITION);
 
 	let metrics = metrics::Metrics::new_dummy();
 	let mut vote_queries: usize = 0;
@@ -720,3 +760,30 @@ fn votes_above_limit() {
 		ACCEPTABLE_RUNTIME_VOTES_QUERIES_COUNT
 	);
 }
+
+#[test]
+fn unconfirmed_are_handled_correctly() {
+	const VALIDATOR_COUNT: usize = 10;
+	const DISPUTES_PER_PARTITION: usize = 50;
+
+	let mut input = TestDisputes::new(VALIDATOR_COUNT);
+
+	// Add unconfirmed known onchain -> this should be pushed
+	let (pushed_idx, _) = input.add_unconfirmed_disputes_known_onchain(DISPUTES_PER_PARTITION);
+
+	// Add unconfirmed unknown onchain -> this should be ignored
+	input.add_unconfirmed_disputes_unknown_onchain(DISPUTES_PER_PARTITION);
+
+	let metrics = metrics::Metrics::new_dummy();
+	let mut vote_queries: usize = 0;
+	test_harness(
+		|r| mock_overseer(r, &mut input, &mut vote_queries),
+		|mut tx: TestSubsystemSender| async move {
+			let lf = leaf();
+			let result = select_disputes(&mut tx, &metrics, &lf).await;
+
+			assert!(result.len() == DISPUTES_PER_PARTITION);
+			result.iter().for_each(|d| assert!(d.session == pushed_idx));
+		},
+	);
+}

polkadot/node/core/provisioner/src/disputes/random_selection/mod.rs

@@ -42,51 +42,35 @@ enum RequestType {
 }
 
 /// Request open disputes identified by `CandidateHash` and the `SessionIndex`.
-async fn request_disputes(
+/// Returns only confirmed/concluded disputes. The rest are filtered out.
+async fn request_confirmed_disputes(
 	sender: &mut impl overseer::ProvisionerSenderTrait,
 	active_or_recent: RequestType,
 ) -> Vec<(SessionIndex, CandidateHash)> {
-	let disputes = match active_or_recent {
-		RequestType::Recent => {
-			let (tx, rx) = oneshot::channel();
-			let msg = DisputeCoordinatorMessage::RecentDisputes(tx);
-			sender.send_unbounded_message(msg);
-			let recent_disputes = match rx.await {
-				Ok(r) => r,
-				Err(oneshot::Canceled) => {
-					gum::warn!(
-						target: LOG_TARGET,
-						"Channel closed: unable to gather {:?} disputes",
-						active_or_recent
-					);
-					Vec::new()
-				},
-			};
-			recent_disputes
-				.into_iter()
-				.map(|(sesion_idx, candodate_hash, _)| (sesion_idx, candodate_hash))
-				.collect::<Vec<_>>()
-		},
-		RequestType::Active => {
-			let (tx, rx) = oneshot::channel();
-			let msg = DisputeCoordinatorMessage::ActiveDisputes(tx);
-			sender.send_unbounded_message(msg);
-			let active_disputes = match rx.await {
-				Ok(r) => r,
-				Err(oneshot::Canceled) => {
-					gum::warn!(
-						target: LOG_TARGET,
-						"Unable to gather {:?} disputes",
-						active_or_recent
-					);
-					Vec::new()
-				},
-			};
-			active_disputes
+	let (tx, rx) = oneshot::channel();
+	let msg = match active_or_recent {
+		RequestType::Recent => DisputeCoordinatorMessage::RecentDisputes(tx),
+		RequestType::Active => DisputeCoordinatorMessage::ActiveDisputes(tx),
+	};
+
+	sender.send_unbounded_message(msg);
+	let disputes = match rx.await {
+		Ok(r) => r,
+		Err(oneshot::Canceled) => {
+			gum::warn!(
+				target: LOG_TARGET,
+				"Channel closed: unable to gather {:?} disputes",
+				active_or_recent
+			);
+			Vec::new()
 		},
 	};
 
 	disputes
+		.into_iter()
+		.filter(|d| d.2.is_confirmed_concluded())
+		.map(|d| (d.0, d.1))
+		.collect()
 }
 
 /// Extend `acc` by `n` random, picks of not-yet-present in `acc` items of `recent` without repetition and additions of recent.
@@ -132,7 +116,7 @@ where
 	// In case of an overload condition, we limit ourselves to active disputes, and fill up to the
 	// upper bound of disputes to pass to wasm `fn create_inherent_data`.
 	// If the active ones are already exceeding the bounds, randomly select a subset.
-	let recent = request_disputes(sender, RequestType::Recent).await;
+	let recent = request_confirmed_disputes(sender, RequestType::Recent).await;
 	let disputes = if recent.len() > MAX_DISPUTES_FORWARDED_TO_RUNTIME {
 		gum::warn!(
 			target: LOG_TARGET,
@@ -140,7 +124,7 @@ where
 			recent.len(),
 			MAX_DISPUTES_FORWARDED_TO_RUNTIME
 		);
-		let mut active = request_disputes(sender, RequestType::Active).await;
+		let mut active = request_confirmed_disputes(sender, RequestType::Active).await;
 		let n_active = active.len();
 		let active = if active.len() > MAX_DISPUTES_FORWARDED_TO_RUNTIME {
 			let mut picked = Vec::with_capacity(MAX_DISPUTES_FORWARDED_TO_RUNTIME);