Revert "override conversion rate in estimate-message-fee RPC (#1189)" (#1275)

This reverts commit ad4299f6c91ce4c50cb6fbc739a0c788e2920956.

bridges/primitives/chain-westend/Cargo.toml

@@ -14,6 +14,7 @@ smallvec = "1.7"
 # Bridge Dependencies
 
 bp-header-chain = { path = "../header-chain", default-features = false }
+bp-messages = { path = "../messages", default-features = false }
 bp-polkadot-core = { path = "../polkadot-core", default-features = false }
 bp-runtime = { path = "../runtime", default-features = false }
 
@@ -29,6 +30,7 @@ sp-version = { git = "https://github.com/paritytech/substrate", branch = "master
 default = ["std"]
 std = [
 	"bp-header-chain/std",
+	"bp-messages/std",
 	"bp-polkadot-core/std",
 	"bp-runtime/std",
 	"frame-support/std",

bridges/primitives/chain-westend/src/lib.rs

@@ -20,6 +20,7 @@
 // Runtime-generated DecodeLimit::decode_all_with_depth_limit
 #![allow(clippy::unnecessary_mut_passed)]
 
+use bp_messages::{LaneId, MessageDetails, MessageNonce, UnrewardedRelayersState};
 use frame_support::weights::{
 	WeightToFeeCoefficient, WeightToFeeCoefficients, WeightToFeePolynomial,
 };
@@ -109,4 +110,51 @@ sp_api::decl_runtime_apis! {
 		/// Returns number and hash of the best finalized header known to the bridge module.
 		fn best_finalized() -> (BlockNumber, Hash);
 	}
+
+	/// Outbound message lane API for messages that are sent to Westend chain.
+	///
+	/// This API is implemented by runtimes that are sending messages to Westend chain, not the
+	/// Westend runtime itself.
+	pub trait ToWestendOutboundLaneApi<OutboundMessageFee: Parameter, OutboundPayload: Parameter> {
+		/// Estimate message delivery and dispatch fee that needs to be paid by the sender on
+		/// this chain.
+		///
+		/// Returns `None` if message is too expensive to be sent to Westend from this chain.
+		///
+		/// Please keep in mind that this method returns the lowest message fee required for message
+		/// to be accepted to the lane. It may be good idea to pay a bit over this price to account
+		/// future exchange rate changes and guarantee that relayer would deliver your message
+		/// to the target chain.
+		fn estimate_message_delivery_and_dispatch_fee(
+			lane_id: LaneId,
+			payload: OutboundPayload,
+		) -> Option<OutboundMessageFee>;
+		/// Returns dispatch weight, encoded payload size and delivery+dispatch fee of all
+		/// messages in given inclusive range.
+		///
+		/// If some (or all) messages are missing from the storage, they'll also will
+		/// be missing from the resulting vector. The vector is ordered by the nonce.
+		fn message_details(
+			lane: LaneId,
+			begin: MessageNonce,
+			end: MessageNonce,
+		) -> Vec<MessageDetails<OutboundMessageFee>>;
+		/// Returns nonce of the latest message, received by bridged chain.
+		fn latest_received_nonce(lane: LaneId) -> MessageNonce;
+		/// Returns nonce of the latest message, generated by given lane.
+		fn latest_generated_nonce(lane: LaneId) -> MessageNonce;
+	}
+
+	/// Inbound message lane API for messages sent by Westend chain.
+	///
+	/// This API is implemented by runtimes that are receiving messages from Westend chain, not the
+	/// Westend runtime itself.
+	pub trait FromWestendInboundLaneApi {
+		/// Returns nonce of the latest message, received by given lane.
+		fn latest_received_nonce(lane: LaneId) -> MessageNonce;
+		/// Nonce of the latest message that has been confirmed to the bridged chain.
+		fn latest_confirmed_nonce(lane: LaneId) -> MessageNonce;
+		/// State of the unrewarded relayers set at given lane.
+		fn unrewarded_relayers_state(lane: LaneId) -> UnrewardedRelayersState;
+	}
 }