Bridges subtree sync (#3022)

* Squashed 'bridges/' changes from edf33a2c85..277f0d5496

277f0d5496 Dynamic fees for bridges-v1 (#2294)
b1c51f7dd2 Finality loop refactoring (#2357)
620db2b10f Add equivocation detector crate and implement clients (#2348) (#2353)
3fe4b13eb4 Add basic equivocation detection pipeline schema (#2338) (#2341)

git-subtree-dir: bridges
git-subtree-split: 277f0d54961c800b231d8123c6445f378b1deb89

* [dynfees] Rococo/Wococo does not need congestion and dynamic fees (for now)

* Fix

* ".git/.scripts/commands/fmt/fmt.sh"

* Forgotten bridges/Cargo.lock

---------

Co-authored-by: command-bot <>

cumulus/bridges/primitives/messages/src/lib.rs

@@ -387,6 +387,14 @@ impl Default for OutboundLaneData {
 	}
 }
 
+impl OutboundLaneData {
+	/// Return nonces of all currently queued messages (i.e. messages that we believe
+	/// are not delivered yet).
+	pub fn queued_messages(&self) -> RangeInclusive<MessageNonce> {
+		(self.latest_received_nonce + 1)..=self.latest_generated_nonce
+	}
+}
+
 /// Calculate the number of messages that the relayers have delivered.
 pub fn calc_relayers_rewards<AccountId>(
 	messages_relayers: VecDeque<UnrewardedRelayer<AccountId>>,

cumulus/bridges/primitives/messages/src/source_chain.rs

@@ -115,11 +115,26 @@ impl<AccountId> DeliveryConfirmationPayments<AccountId> for () {
 	}
 }
 
+/// Callback that is called at the source chain (bridge hub) when we get delivery confirmation
+/// for new messages.
+pub trait OnMessagesDelivered {
+	/// New messages delivery has been confirmed.
+	///
+	/// The only argument of the function is the number of yet undelivered messages
+	fn on_messages_delivered(lane: LaneId, enqueued_messages: MessageNonce);
+}
+
+impl OnMessagesDelivered for () {
+	fn on_messages_delivered(_lane: LaneId, _enqueued_messages: MessageNonce) {}
+}
+
 /// Send message artifacts.
 #[derive(Eq, RuntimeDebug, PartialEq)]
 pub struct SendMessageArtifacts {
 	/// Nonce of the message.
 	pub nonce: MessageNonce,
+	/// Number of enqueued messages at the lane, after the message is sent.
+	pub enqueued_messages: MessageNonce,
 }
 
 /// Messages bridge API to be used from other pallets.
@@ -141,7 +156,7 @@ impl<Payload> MessagesBridge<Payload> for NoopMessagesBridge {
 	type Error = &'static str;
 
 	fn send_message(_lane: LaneId, _message: Payload) -> Result<SendMessageArtifacts, Self::Error> {
-		Ok(SendMessageArtifacts { nonce: 0 })
+		Ok(SendMessageArtifacts { nonce: 0, enqueued_messages: 0 })
 	}
 }
 

cumulus/bridges/primitives/messages/src/target_chain.rs

@@ -91,6 +91,15 @@ pub trait MessageDispatch {
 	/// Fine-grained result of single message dispatch (for better diagnostic purposes)
 	type DispatchLevelResult: Clone + sp_std::fmt::Debug + Eq;
 
+	/// Returns `true` if dispatcher is ready to accept additional messages. The `false` should
+	/// be treated as a hint by both dispatcher and its consumers - i.e. dispatcher shall not
+	/// simply drop messages if it returns `false`. The consumer may still call the `dispatch`
+	/// if dispatcher has returned `false`.
+	///
+	/// We check it in the messages delivery transaction prologue. So if it becomes `false`
+	/// after some portion of messages is already dispatched, it doesn't fail the whole transaction.
+	fn is_active() -> bool;
+
 	/// Estimate dispatch weight.
 	///
 	/// This function must return correct upper bound of dispatch weight. The return value
@@ -186,6 +195,10 @@ impl<MessagesProof, DispatchPayload: Decode> MessageDispatch
 	type DispatchPayload = DispatchPayload;
 	type DispatchLevelResult = ();
 
+	fn is_active() -> bool {
+		false
+	}
+
 	fn dispatch_weight(_message: &mut DispatchMessage<Self::DispatchPayload>) -> Weight {
 		Weight::MAX
 	}