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

paritytech · acatangiu · Dec 23, 2021 · Nov 11, 2021 · Nov 15, 2021 · Nov 15, 2021
commit 50ffb5dd08d662d811e42f6a7cfd9cfb1a7f7de7
diff --git a/Cargo.lock b/Cargo.lock
diff --git a/bin/millau/runtime/src/lib.rs b/bin/millau/runtime/src/lib.rs
@@ -52,7 +52,7 @@ use sp_runtime::{
 	create_runtime_str, generic, impl_opaque_keys,
 	traits::{Block as BlockT, IdentityLookup, Keccak256, NumberFor, OpaqueKeys},
 	transaction_validity::{TransactionSource, TransactionValidity},
-	ApplyExtrinsicResult, FixedPointNumber, MultiSignature, MultiSigner, Perquintill,
+	ApplyExtrinsicResult, FixedPointNumber, FixedU128, MultiSignature, MultiSigner, Perquintill,
 };
 use sp_std::prelude::*;
 #[cfg(feature = "std")]
@@ -744,10 +744,12 @@ impl_runtime_apis! {
 		fn estimate_message_delivery_and_dispatch_fee(
 			_lane_id: bp_messages::LaneId,
 			payload: ToRialtoMessagePayload,
+			rialto_to_this_conversion_rate: Option<FixedU128>,
 		) -> Option<Balance> {
 			estimate_message_dispatch_and_delivery_fee::<WithRialtoMessageBridge>(
 				&payload,
 				WithRialtoMessageBridge::RELAYER_FEE_PERCENT,
+				rialto_to_this_conversion_rate,
 			).ok()
 		}
 

diff --git a/bin/millau/runtime/src/rialto_messages.rs b/bin/millau/runtime/src/rialto_messages.rs
@@ -91,11 +91,14 @@ impl MessageBridge for WithRialtoMessageBridge {
 	type ThisChain = Millau;
 	type BridgedChain = Rialto;
 
-	fn bridged_balance_to_this_balance(bridged_balance: bp_rialto::Balance) -> bp_millau::Balance {
-		bp_millau::Balance::try_from(
-			RialtoToMillauConversionRate::get().saturating_mul_int(bridged_balance),
-		)
-		.unwrap_or(bp_millau::Balance::MAX)
+	fn bridged_balance_to_this_balance(
+		bridged_balance: bp_rialto::Balance,
+		bridged_to_this_conversion_rate_override: Option<FixedU128>,
+	) -> bp_millau::Balance {
+		let conversion_rate = bridged_to_this_conversion_rate_override
+			.unwrap_or_else(|| RialtoToMillauConversionRate::get());
+		bp_millau::Balance::try_from(conversion_rate.saturating_mul_int(bridged_balance))
+			.unwrap_or(bp_millau::Balance::MAX)
 	}
 }
 

diff --git a/bin/rialto/runtime/src/lib.rs b/bin/rialto/runtime/src/lib.rs
@@ -53,7 +53,7 @@ use sp_runtime::{
 	create_runtime_str, generic, impl_opaque_keys,
 	traits::{AccountIdLookup, Block as BlockT, Keccak256, NumberFor, OpaqueKeys},
 	transaction_validity::{TransactionSource, TransactionValidity},
-	ApplyExtrinsicResult, FixedPointNumber, MultiSignature, MultiSigner, Perquintill,
+	ApplyExtrinsicResult, FixedPointNumber, FixedU128, MultiSignature, MultiSigner, Perquintill,
 };
 use sp_std::{collections::btree_map::BTreeMap, prelude::*};
 #[cfg(feature = "std")]
@@ -892,10 +892,12 @@ impl_runtime_apis! {
 		fn estimate_message_delivery_and_dispatch_fee(
 			_lane_id: bp_messages::LaneId,
 			payload: ToMillauMessagePayload,
+			millau_to_this_conversion_rate: Option<FixedU128>,
 		) -> Option<Balance> {
 			estimate_message_dispatch_and_delivery_fee::<WithMillauMessageBridge>(
 				&payload,
 				WithMillauMessageBridge::RELAYER_FEE_PERCENT,
+				millau_to_this_conversion_rate,
 			).ok()
 		}
 

diff --git a/bin/rialto/runtime/src/millau_messages.rs b/bin/rialto/runtime/src/millau_messages.rs
@@ -91,11 +91,14 @@ impl MessageBridge for WithMillauMessageBridge {
 	type ThisChain = Rialto;
 	type BridgedChain = Millau;
 
-	fn bridged_balance_to_this_balance(bridged_balance: bp_millau::Balance) -> bp_rialto::Balance {
-		bp_rialto::Balance::try_from(
-			MillauToRialtoConversionRate::get().saturating_mul_int(bridged_balance),
-		)
-		.unwrap_or(bp_rialto::Balance::MAX)
+	fn bridged_balance_to_this_balance(
+		bridged_balance: bp_millau::Balance,
+		bridged_to_this_conversion_rate_override: Option<FixedU128>,
+	) -> bp_rialto::Balance {
+		let conversion_rate = bridged_to_this_conversion_rate_override
+			.unwrap_or_else(|| MillauToRialtoConversionRate::get());
+		bp_rialto::Balance::try_from(conversion_rate.saturating_mul_int(bridged_balance))
+			.unwrap_or(bp_rialto::Balance::MAX)
 	}
 }
 

diff --git a/bin/runtime-common/src/messages.rs b/bin/runtime-common/src/messages.rs
@@ -70,6 +70,7 @@ pub trait MessageBridge {
 	/// Convert Bridged chain balance into This chain balance.
 	fn bridged_balance_to_this_balance(
 		bridged_balance: BalanceOf<BridgedChain<Self>>,
+		bridged_to_this_conversion_rate_override: Option<FixedU128>,
 	) -> BalanceOf<ThisChain<Self>>;
 }
 
@@ -316,8 +317,11 @@ pub mod source {
 			pallet_bridge_dispatch::verify_message_origin(submitter, payload)
 				.map_err(|_| BAD_ORIGIN)?;
 
-			let minimal_fee_in_this_tokens =
-				estimate_message_dispatch_and_delivery_fee::<B>(payload, B::RELAYER_FEE_PERCENT)?;
+			let minimal_fee_in_this_tokens = estimate_message_dispatch_and_delivery_fee::<B>(
+				payload,
+				B::RELAYER_FEE_PERCENT,
+				None,
+			)?;
 
 			// compare with actual fee paid
 			if *delivery_and_dispatch_fee < minimal_fee_in_this_tokens {
@@ -371,6 +375,7 @@ pub mod source {
 	pub fn estimate_message_dispatch_and_delivery_fee<B: MessageBridge>(
 		payload: &FromThisChainMessagePayload<B>,
 		relayer_fee_percent: u32,
+		bridged_to_this_conversion_rate: Option<FixedU128>,
 	) -> Result<BalanceOf<ThisChain<B>>, &'static str> {
 		// the fee (in Bridged tokens) of all transactions that are made on the Bridged chain
 		//
@@ -391,8 +396,11 @@ pub mod source {
 			ThisChain::<B>::transaction_payment(confirmation_transaction);
 
 		// minimal fee (in This tokens) is a sum of all required fees
-		let minimal_fee = B::bridged_balance_to_this_balance(delivery_transaction_fee)
-			.checked_add(&confirmation_transaction_fee);
+		let minimal_fee = B::bridged_balance_to_this_balance(
+			delivery_transaction_fee,
+			bridged_to_this_conversion_rate,
+		)
+		.checked_add(&confirmation_transaction_fee);
 
 		// before returning, add extra fee that is paid to the relayer (relayer interest)
 		minimal_fee
@@ -798,8 +806,12 @@ mod tests {
 
 		fn bridged_balance_to_this_balance(
 			bridged_balance: BridgedChainBalance,
+			bridged_to_this_conversion_rate_override: Option<FixedU128>,
 		) -> ThisChainBalance {
-			ThisChainBalance(bridged_balance.0 * BRIDGED_CHAIN_TO_THIS_CHAIN_BALANCE_RATE as u32)
+			let conversion_rate = bridged_to_this_conversion_rate_override
+				.map(|r| r.to_float() as u32)
+				.unwrap_or(BRIDGED_CHAIN_TO_THIS_CHAIN_BALANCE_RATE);
+			ThisChainBalance(bridged_balance.0 * conversion_rate)
 		}
 	}
 
@@ -817,7 +829,10 @@ mod tests {
 		type ThisChain = BridgedChain;
 		type BridgedChain = ThisChain;
 
-		fn bridged_balance_to_this_balance(_this_balance: ThisChainBalance) -> BridgedChainBalance {
+		fn bridged_balance_to_this_balance(
+			_this_balance: ThisChainBalance,
+			_bridged_to_this_conversion_rate_override: Option<FixedU128>,
+		) -> BridgedChainBalance {
 			unreachable!()
 		}
 	}
@@ -1095,6 +1110,7 @@ mod tests {
 			source::estimate_message_dispatch_and_delivery_fee::<OnThisChainBridge>(
 				&payload,
 				OnThisChainBridge::RELAYER_FEE_PERCENT,
+				None,
 			),
 			Ok(ThisChainBalance(EXPECTED_MINIMAL_FEE)),
 		);
@@ -1106,6 +1122,7 @@ mod tests {
 			source::estimate_message_dispatch_and_delivery_fee::<OnThisChainBridge>(
 				&payload_with_pay_on_target,
 				OnThisChainBridge::RELAYER_FEE_PERCENT,
+				None,
 			)
 			.expect(
 				"estimate_message_dispatch_and_delivery_fee failed for pay-at-target-chain message",
@@ -1572,4 +1589,21 @@ mod tests {
 			100 + 50 * 10 + 777,
 		);
 	}
+
+	#[test]
+	fn conversion_rate_override_works() {
+		let payload = regular_outbound_message_payload();
+		let regular_fee = source::estimate_message_dispatch_and_delivery_fee::<OnThisChainBridge>(
+			&payload,
+			OnThisChainBridge::RELAYER_FEE_PERCENT,
+			None,
+		);
+		let overrided_fee = source::estimate_message_dispatch_and_delivery_fee::<OnThisChainBridge>(
+			&payload,
+			OnThisChainBridge::RELAYER_FEE_PERCENT,
+			Some(FixedU128::from_float((BRIDGED_CHAIN_TO_THIS_CHAIN_BALANCE_RATE * 2) as f64)),
+		);
+
+		assert!(regular_fee < overrided_fee);
+	}
 }
diff --git a/primitives/chain-kusama/Cargo.toml b/primitives/chain-kusama/Cargo.toml
@@ -19,6 +19,7 @@ bp-runtime = { path = "../runtime", default-features = false }
 
 frame-support = { git = "https://github.com/paritytech/substrate", branch = "master", default-features = false }
 sp-api = { git = "https://github.com/paritytech/substrate", branch = "master", default-features = false }
+sp-runtime = { git = "https://github.com/paritytech/substrate", branch = "master", default-features = false }
 sp-std = { git = "https://github.com/paritytech/substrate", branch = "master", default-features = false }
 sp-version = { git = "https://github.com/paritytech/substrate", branch = "master", default-features = false }
 
@@ -30,6 +31,7 @@ std = [
 	"bp-runtime/std",
 	"frame-support/std",
 	"sp-api/std",
+	"sp-runtime/std",
 	"sp-std/std",
 	"sp-version/std",
 ]
diff --git a/primitives/chain-kusama/src/lib.rs b/primitives/chain-kusama/src/lib.rs
@@ -24,6 +24,7 @@ use bp_messages::{LaneId, MessageDetails, MessageNonce, UnrewardedRelayersState}
 use frame_support::weights::{
 	WeightToFeeCoefficient, WeightToFeeCoefficients, WeightToFeePolynomial,
 };
+use sp_runtime::FixedU128;
 use sp_std::prelude::*;
 use sp_version::RuntimeVersion;
 
@@ -141,6 +142,7 @@ sp_api::decl_runtime_apis! {
 		fn estimate_message_delivery_and_dispatch_fee(
 			lane_id: LaneId,
 			payload: OutboundPayload,
+			kusama_to_this_conversion_rate: Option<FixedU128>,
 		) -> Option<OutboundMessageFee>;
 		/// Returns dispatch weight, encoded payload size and delivery+dispatch fee of all
 		/// messages in given inclusive range.

diff --git a/primitives/chain-millau/src/lib.rs b/primitives/chain-millau/src/lib.rs
@@ -33,7 +33,7 @@ use scale_info::TypeInfo;
 use sp_core::Hasher as HasherT;
 use sp_runtime::{
 	traits::{Convert, IdentifyAccount, Verify},
-	MultiSignature, MultiSigner, Perbill,
+	FixedU128, MultiSignature, MultiSigner, Perbill,
 };
 use sp_std::prelude::*;
 use sp_trie::{trie_types::Layout, TrieConfiguration};
@@ -319,6 +319,7 @@ sp_api::decl_runtime_apis! {
 		fn estimate_message_delivery_and_dispatch_fee(
 			lane_id: LaneId,
 			payload: OutboundPayload,
+			millau_to_this_conversion_rate: Option<FixedU128>,
 		) -> Option<OutboundMessageFee>;
 		/// Returns dispatch weight, encoded payload size and delivery+dispatch fee of all
 		/// messages in given inclusive range.

diff --git a/primitives/chain-polkadot/Cargo.toml b/primitives/chain-polkadot/Cargo.toml
@@ -19,6 +19,7 @@ bp-runtime = { path = "../runtime", default-features = false }
 
 frame-support = { git = "https://github.com/paritytech/substrate", branch = "master", default-features = false }
 sp-api = { git = "https://github.com/paritytech/substrate", branch = "master", default-features = false }
+sp-runtime = { git = "https://github.com/paritytech/substrate", branch = "master", default-features = false }
 sp-std = { git = "https://github.com/paritytech/substrate", branch = "master", default-features = false }
 sp-version = { git = "https://github.com/paritytech/substrate", branch = "master", default-features = false }
 
@@ -30,6 +31,7 @@ std = [
 	"bp-runtime/std",
 	"frame-support/std",
 	"sp-api/std",
+	"sp-runtime/std",
 	"sp-std/std",
 	"sp-version/std",
 ]
diff --git a/primitives/chain-polkadot/src/lib.rs b/primitives/chain-polkadot/src/lib.rs
@@ -24,6 +24,7 @@ use bp_messages::{LaneId, MessageDetails, MessageNonce, UnrewardedRelayersState}
 use frame_support::weights::{
 	WeightToFeeCoefficient, WeightToFeeCoefficients, WeightToFeePolynomial,
 };
+use sp_runtime::FixedU128;
 use sp_std::prelude::*;
 use sp_version::RuntimeVersion;
 
@@ -141,6 +142,7 @@ sp_api::decl_runtime_apis! {
 		fn estimate_message_delivery_and_dispatch_fee(
 			lane_id: LaneId,
 			payload: OutboundPayload,
+			polkadot_to_this_conversion_rate: Option<FixedU128>,
 		) -> Option<OutboundMessageFee>;
 		/// Returns dispatch weight, encoded payload size and delivery+dispatch fee of all
 		/// messages in given inclusive range.

diff --git a/primitives/chain-rialto/src/lib.rs b/primitives/chain-rialto/src/lib.rs
@@ -30,7 +30,7 @@ use frame_system::limits;
 use sp_core::Hasher as HasherT;
 use sp_runtime::{
 	traits::{BlakeTwo256, Convert, IdentifyAccount, Verify},
-	MultiSignature, MultiSigner, Perbill,
+	FixedU128, MultiSignature, MultiSigner, Perbill,
 };
 use sp_std::prelude::*;
 
@@ -291,6 +291,7 @@ sp_api::decl_runtime_apis! {
 		fn estimate_message_delivery_and_dispatch_fee(
 			lane_id: LaneId,
 			payload: OutboundPayload,
+			rialto_to_this_conversion_rate: Option<FixedU128>,
 		) -> Option<OutboundMessageFee>;
 		/// Returns dispatch weight, encoded payload size and delivery+dispatch fee of all
 		/// messages in given inclusive range.

diff --git a/primitives/chain-rococo/src/lib.rs b/primitives/chain-rococo/src/lib.rs
@@ -24,6 +24,7 @@ use bp_messages::{LaneId, MessageDetails, MessageNonce, UnrewardedRelayersState}
 use frame_support::weights::{
 	Weight, WeightToFeeCoefficient, WeightToFeeCoefficients, WeightToFeePolynomial,
 };
+use sp_runtime::FixedU128;
 use sp_std::prelude::*;
 use sp_version::RuntimeVersion;
 
@@ -142,6 +143,7 @@ sp_api::decl_runtime_apis! {
 		fn estimate_message_delivery_and_dispatch_fee(
 			lane_id: LaneId,
 			payload: OutboundPayload,
+			rococo_to_this_conversion_rate: Option<FixedU128>,
 		) -> Option<OutboundMessageFee>;
 		/// Returns dispatch weight, encoded payload size and delivery+dispatch fee of all
 		/// messages in given inclusive range.

diff --git a/primitives/chain-westend/Cargo.toml b/primitives/chain-westend/Cargo.toml
@@ -14,7 +14,6 @@ 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 }
 
@@ -30,7 +29,6 @@ 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",