dmp-queue: Store messages if already processed more than the maximum

pallets/dmp-queue/src/lib.rs

@@ -189,6 +189,8 @@ pub mod pallet {
 		},
 		/// Downward message from the overweight queue was executed.
 		OverweightServiced { overweight_index: OverweightIndex, weight_used: Weight },
+		/// The maximum number of downward messages was.
+		MaxMessagesExhausted { message_id: MessageId },
 	}
 
 	impl<T: Config> Pallet<T> {
@@ -306,46 +308,53 @@ pub mod pallet {
 			};
 
 			for (i, (sent_at, data)) in iter.enumerate() {
-				if messages_processed >= MAX_MESSAGES_PER_BLOCK {
-					break
-				}
 				if maybe_enqueue_page.is_none() {
-					// We're not currently enqueuing - try to execute inline.
-					let remaining_weight = limit.saturating_sub(used);
-					messages_processed += 1;
-					match Self::try_service_message(remaining_weight, sent_at, &data[..]) {
-						Ok(consumed) => used += consumed,
-						Err((message_id, required_weight)) =>
-						// Too much weight required right now.
-						{
-							let is_under_limit = Overweight::<T>::count() < MAX_OVERWEIGHT_MESSAGES;
-							used.saturating_accrue(T::DbWeight::get().reads(1));
-							if required_weight.any_gt(config.max_individual) && is_under_limit {
-								// overweight - add to overweight queue and continue with
-								// message execution.
-								let overweight_index = page_index.overweight_count;
-								Overweight::<T>::insert(overweight_index, (sent_at, data));
-								Self::deposit_event(Event::OverweightEnqueued {
-									message_id,
-									overweight_index,
-									required_weight,
-								});
-								page_index.overweight_count += 1;
-								// Not needed for control flow, but only to ensure that the compiler
-								// understands that we won't attempt to re-use `data` later.
-								continue
-							} else {
-								// not overweight. stop executing inline and enqueue normally
-								// from here on.
-								let item_count_left = item_count.saturating_sub(i);
-								maybe_enqueue_page = Some(Vec::with_capacity(item_count_left));
-								Self::deposit_event(Event::WeightExhausted {
-									message_id,
-									remaining_weight,
-									required_weight,
-								});
-							}
-						},
+					if messages_processed >= MAX_MESSAGES_PER_BLOCK {
+						let item_count_left = item_count.saturating_sub(i);
+						maybe_enqueue_page = Some(Vec::with_capacity(item_count_left));
+
+						Self::deposit_event(Event::MaxMessagesExhausted {
+							message_id: sp_io::hashing::blake2_256(&data),
+						});
+					} else {
+						// We're not currently enqueuing - try to execute inline.
+						let remaining_weight = limit.saturating_sub(used);
+						messages_processed += 1;
+						match Self::try_service_message(remaining_weight, sent_at, &data[..]) {
+							Ok(consumed) => used += consumed,
+							Err((message_id, required_weight)) =>
+							// Too much weight required right now.
+							{
+								let is_under_limit =
+									Overweight::<T>::count() < MAX_OVERWEIGHT_MESSAGES;
+								used.saturating_accrue(T::DbWeight::get().reads(1));
+								if required_weight.any_gt(config.max_individual) && is_under_limit {
+									// overweight - add to overweight queue and continue with
+									// message execution.
+									let overweight_index = page_index.overweight_count;
+									Overweight::<T>::insert(overweight_index, (sent_at, data));
+									Self::deposit_event(Event::OverweightEnqueued {
+										message_id,
+										overweight_index,
+										required_weight,
+									});
+									page_index.overweight_count += 1;
+									// Not needed for control flow, but only to ensure that the compiler
+									// understands that we won't attempt to re-use `data` later.
+									continue
+								} else {
+									// not overweight. stop executing inline and enqueue normally
+									// from here on.
+									let item_count_left = item_count.saturating_sub(i);
+									maybe_enqueue_page = Some(Vec::with_capacity(item_count_left));
+									Self::deposit_event(Event::WeightExhausted {
+										message_id,
+										remaining_weight,
+										required_weight,
+									});
+								}
+							},
+						}
 					}
 				}
 				// Cannot be an `else` here since the `maybe_enqueue_page` may have changed.
@@ -888,4 +897,37 @@ mod tests {
 			assert_eq!(pages_queued(), 1);
 		});
 	}
+
+	#[test]
+	fn handle_max_messages_per_block() {
+		new_test_ext().execute_with(|| {
+			enqueue(&vec![msg(1000), msg(1001)]);
+			enqueue(&vec![msg(1002), msg(1003)]);
+			enqueue(&vec![msg(1004), msg(1005)]);
+
+			let incoming = (0..MAX_MESSAGES_PER_BLOCK)
+				.into_iter()
+				.map(|i| msg(1006 + i as u64))
+				.collect::<Vec<_>>();
+			handle_messages(&incoming, Weight::from_parts(25000, 25000));
+
+			assert_eq!(
+				take_trace(),
+				(0..MAX_MESSAGES_PER_BLOCK)
+					.into_iter()
+					.map(|i| msg_complete(1000 + i as u64))
+					.collect::<Vec<_>>(),
+			);
+			assert_eq!(pages_queued(), 1);
+
+			handle_messages(&[], Weight::from_parts(25000, 25000));
+			assert_eq!(
+				take_trace(),
+				(MAX_MESSAGES_PER_BLOCK..MAX_MESSAGES_PER_BLOCK + 6)
+					.into_iter()
+					.map(|i| msg_complete(1000 + i as u64))
+					.collect::<Vec<_>>(),
+			);
+		});
+	}
 }