Treasury Pallet Account as destination for XCM fees on System Paracha…

…ins (polkadot-fellows#191)

Designates the Treasury Pallet Account as the destination for XCM fees
on System Parachains.

This ensures that assets accumulated in the pallet's account can be
spent by Treasury Origins from Relay Chains.

---------

Co-authored-by: Sergej Sakac <[email protected]>

CHANGELOG.md

@@ -23,6 +23,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 - Deprecate the `xcm::body::TREASURER_INDEX` constant and use the standard `Treasury` variant from the `xcm::BodyId` type instead ([polkadot-fellows/runtimes#149](https://github.com/polkadot-fellows/runtimes/pull/149))
 - Bump parachains runtime API to v9 in Kusama to enable the `node_features` function [polkadot-fellows/runtimes#194](https://github.com/polkadot-fellows/runtimes/pull/194)
 - Bump parachains runtime API to v10 in Kusama to enable the `approval-voting-params` function [polkadot-fellows/runtimes#204](https://github.com/polkadot-fellows/runtimes/pull/204)
+- Use Relay Chain's Treasury Pallet account as a destination for XCM fees on System Parachain ([polkadot-fellows/runtimes#191](https://github.com/polkadot-fellows/runtimes/pull/191))
 
 ### Removed
 

system-parachains/asset-hubs/asset-hub-kusama/src/xcm_config.rs

@@ -49,7 +49,10 @@ use xcm_builder::{
 	TakeWeightCredit, TrailingSetTopicAsId, UsingComponents, WeightInfoBounds, WithComputedOrigin,
 	WithUniqueTopic, XcmFeeManagerFromComponents, XcmFeeToAccount,
 };
-use xcm_executor::{traits::WithOriginFilter, XcmExecutor};
+use xcm_executor::{
+	traits::{ConvertLocation, WithOriginFilter},
+	XcmExecutor,
+};
 
 parameter_types! {
 	pub const KsmLocation: Location = Location::parent();
@@ -73,6 +76,11 @@ parameter_types! {
 	pub const FellowshipLocation: Location = Location::parent();
 	pub RelayTreasuryLocation: Location = (Parent, PalletInstance(kusama_runtime_constants::TREASURY_PALLET_ID)).into();
 	pub TreasuryAccount: AccountId = TREASURY_PALLET_ID.into_account_truncating();
+	// Test [`crate::tests::treasury_pallet_account_not_none`] ensures that the result of location
+	// conversion is not `None`.
+	pub RelayTreasuryPalletAccount: AccountId =
+		LocationToAccountId::convert_location(&RelayTreasuryLocation::get())
+			.unwrap_or(TreasuryAccount::get());
 }
 
 /// Type for specifying how a `Location` can be converted into an `AccountId`. This is used
@@ -562,7 +570,7 @@ impl xcm_executor::Config for XcmConfig {
 	type AssetExchanger = ();
 	type FeeManager = XcmFeeManagerFromComponents<
 		WaivedLocations,
-		XcmFeeToAccount<Self::AssetTransactor, AccountId, TreasuryAccount>,
+		XcmFeeToAccount<Self::AssetTransactor, AccountId, RelayTreasuryPalletAccount>,
 	>;
 	type MessageExporter = ();
 	type UniversalAliases = bridging::to_polkadot::UniversalAliases;

system-parachains/asset-hubs/asset-hub-kusama/tests/tests.rs

@@ -21,8 +21,8 @@ use asset_hub_kusama_runtime::{
 	xcm_config::{
 		bridging::{self, XcmBridgeHubRouterFeeAssetId},
 		AssetFeeAsExistentialDepositMultiplierFeeCharger, CheckingAccount,
-		ForeignCreatorsSovereignAccountOf, KsmLocation, LocationToAccountId, TreasuryAccount,
-		TrustBackedAssetsPalletLocation, XcmConfig,
+		ForeignCreatorsSovereignAccountOf, KsmLocation, LocationToAccountId, RelayTreasuryLocation,
+		RelayTreasuryPalletAccount, TrustBackedAssetsPalletLocation, XcmConfig,
 	},
 	AllPalletsWithoutSystem, AssetDeposit, Assets, Balances, ExistentialDeposit, ForeignAssets,
 	ForeignAssetsInstance, MetadataDepositBase, MetadataDepositPerByte, ParachainSystem,
@@ -717,7 +717,7 @@ fn limited_reserve_transfer_assets_for_native_asset_to_asset_hub_polkadot_works(
 		bridging_to_asset_hub_polkadot,
 		WeightLimit::Unlimited,
 		Some(XcmBridgeHubRouterFeeAssetId::get()),
-		Some(TreasuryAccount::get()),
+		Some(RelayTreasuryPalletAccount::get()),
 	)
 }
 
@@ -923,3 +923,11 @@ fn change_xcm_bridge_hub_router_byte_fee_by_governance_works() {
 		},
 	)
 }
+
+#[test]
+fn treasury_pallet_account_not_none() {
+	assert_eq!(
+		RelayTreasuryPalletAccount::get(),
+		LocationToAccountId::convert_location(&RelayTreasuryLocation::get()).unwrap()
+	)
+}

system-parachains/asset-hubs/asset-hub-polkadot/src/xcm_config.rs

@@ -50,7 +50,10 @@ use xcm_builder::{
 	TakeWeightCredit, TrailingSetTopicAsId, UsingComponents, WeightInfoBounds, WithComputedOrigin,
 	WithUniqueTopic, XcmFeeManagerFromComponents, XcmFeeToAccount,
 };
-use xcm_executor::{traits::WithOriginFilter, XcmExecutor};
+use xcm_executor::{
+	traits::{ConvertLocation, WithOriginFilter},
+	XcmExecutor,
+};
 
 parameter_types! {
 	pub const DotLocation: Location = Location::parent();
@@ -66,6 +69,11 @@ parameter_types! {
 	pub const GovernanceLocation: Location = Location::parent();
 	pub RelayTreasuryLocation: Location = (Parent, PalletInstance(polkadot_runtime_constants::TREASURY_PALLET_ID)).into();
 	pub TreasuryAccount: AccountId = TREASURY_PALLET_ID.into_account_truncating();
+	// Test [`crate::tests::treasury_pallet_account_not_none`] ensures that the result of location
+	// conversion is not `None`.
+	pub RelayTreasuryPalletAccount: AccountId =
+		LocationToAccountId::convert_location(&RelayTreasuryLocation::get())
+			.unwrap_or(TreasuryAccount::get());
 }
 
 /// Type for specifying how a `Location` can be converted into an `AccountId`. This is used
@@ -512,7 +520,7 @@ impl xcm_executor::Config for XcmConfig {
 	type AssetExchanger = ();
 	type FeeManager = XcmFeeManagerFromComponents<
 		WaivedLocations,
-		XcmFeeToAccount<Self::AssetTransactor, AccountId, TreasuryAccount>,
+		XcmFeeToAccount<Self::AssetTransactor, AccountId, RelayTreasuryPalletAccount>,
 	>;
 	type MessageExporter = ();
 	type UniversalAliases = bridging::to_kusama::UniversalAliases;

system-parachains/asset-hubs/asset-hub-polkadot/tests/tests.rs

@@ -21,8 +21,8 @@ use asset_hub_polkadot_runtime::{
 	xcm_config::{
 		bridging::{self, XcmBridgeHubRouterFeeAssetId},
 		AssetFeeAsExistentialDepositMultiplierFeeCharger, CheckingAccount, DotLocation,
-		ForeignCreatorsSovereignAccountOf, LocationToAccountId, TreasuryAccount,
-		TrustBackedAssetsPalletLocation, XcmConfig,
+		ForeignCreatorsSovereignAccountOf, LocationToAccountId, RelayTreasuryLocation,
+		RelayTreasuryPalletAccount, TrustBackedAssetsPalletLocation, XcmConfig,
 	},
 	AllPalletsWithoutSystem, AssetDeposit, Assets, Balances, ExistentialDeposit, ForeignAssets,
 	ForeignAssetsInstance, MetadataDepositBase, MetadataDepositPerByte, ParachainSystem,
@@ -731,7 +731,7 @@ fn limited_reserve_transfer_assets_for_native_asset_to_asset_hub_kusama_works()
 		bridging_to_asset_hub_kusama,
 		WeightLimit::Unlimited,
 		Some(XcmBridgeHubRouterFeeAssetId::get()),
-		Some(TreasuryAccount::get()),
+		Some(RelayTreasuryPalletAccount::get()),
 	)
 }
 
@@ -935,3 +935,11 @@ fn change_xcm_bridge_hub_router_byte_fee_by_governance_works() {
 		},
 	)
 }
+
+#[test]
+fn treasury_pallet_account_not_none() {
+	assert_eq!(
+		RelayTreasuryPalletAccount::get(),
+		LocationToAccountId::convert_location(&RelayTreasuryLocation::get()).unwrap()
+	)
+}

system-parachains/bridge-hubs/bridge-hub-kusama/src/xcm_config.rs

@@ -49,7 +49,10 @@ use xcm_builder::{
 	TrailingSetTopicAsId, UsingComponents, WeightInfoBounds, WithComputedOrigin, WithUniqueTopic,
 	XcmFeeManagerFromComponents, XcmFeeToAccount,
 };
-use xcm_executor::{traits::WithOriginFilter, XcmExecutor};
+use xcm_executor::{
+	traits::{ConvertLocation, WithOriginFilter},
+	XcmExecutor,
+};
 
 parameter_types! {
 	pub const KsmRelayLocation: Location = Location::parent();
@@ -63,6 +66,11 @@ parameter_types! {
 	pub const FellowshipLocation: Location = Location::parent();
 	pub RelayTreasuryLocation: Location = (Parent, PalletInstance(kusama_runtime_constants::TREASURY_PALLET_ID)).into();
 	pub TreasuryAccount: AccountId = TREASURY_PALLET_ID.into_account_truncating();
+	// Test [`crate::tests::treasury_pallet_account_not_none`] ensures that the result of location
+	// conversion is not `None`.
+	pub RelayTreasuryPalletAccount: AccountId =
+		LocationToAccountId::convert_location(&RelayTreasuryLocation::get())
+			.unwrap_or(TreasuryAccount::get());
 }
 
 /// Type for specifying how a `Location` can be converted into an `AccountId`. This is used
@@ -266,7 +274,7 @@ impl xcm_executor::Config for XcmConfig {
 	type AssetExchanger = ();
 	type FeeManager = XcmFeeManagerFromComponents<
 		WaivedLocations,
-		XcmFeeToAccount<Self::AssetTransactor, AccountId, TreasuryAccount>,
+		XcmFeeToAccount<Self::AssetTransactor, AccountId, RelayTreasuryPalletAccount>,
 	>;
 	type MessageExporter = ToBridgeHubPolkadotHaulBlobExporter;
 	type UniversalAliases = Nothing;
@@ -326,3 +334,11 @@ impl cumulus_pallet_xcm::Config for Runtime {
 	type RuntimeEvent = RuntimeEvent;
 	type XcmExecutor = XcmExecutor<XcmConfig>;
 }
+
+#[test]
+fn treasury_pallet_account_not_none() {
+	assert_eq!(
+		RelayTreasuryPalletAccount::get(),
+		LocationToAccountId::convert_location(&RelayTreasuryLocation::get()).unwrap()
+	)
+}

system-parachains/bridge-hubs/bridge-hub-kusama/tests/tests.rs

@@ -23,7 +23,10 @@ use bridge_hub_kusama_runtime::{
 		RequiredStakeForStakeAndSlash, WithBridgeHubPolkadotMessageBridge,
 		WithBridgeHubPolkadotMessagesInstance, XCM_LANE_FOR_ASSET_HUB_KUSAMA_TO_ASSET_HUB_POLKADOT,
 	},
-	xcm_config::{KsmRelayLocation, RelayNetwork, XcmConfig},
+	xcm_config::{
+		KsmRelayLocation, LocationToAccountId, RelayNetwork, RelayTreasuryLocation,
+		RelayTreasuryPalletAccount, XcmConfig,
+	},
 	AllPalletsWithoutSystem, BridgeRejectObsoleteHeadersAndMessages, Executive, ExistentialDeposit,
 	ParachainSystem, PolkadotXcm, Runtime, RuntimeCall, RuntimeEvent, RuntimeOrigin, SessionKeys,
 	SignedExtra, TransactionPayment, UncheckedExtrinsic, SLOT_DURATION,
@@ -42,6 +45,7 @@ use system_parachains_constants::kusama::{
 	consensus::RELAY_CHAIN_SLOT_DURATION_MILLIS, fee::WeightToFee,
 };
 use xcm::latest::prelude::*;
+use xcm_executor::traits::ConvertLocation;
 
 // Para id of sibling chain used in tests.
 pub const SIBLING_PARACHAIN_ID: u32 = 1000;
@@ -360,6 +364,14 @@ pub fn can_calculate_fee_for_complex_message_confirmation_transaction() {
 	)
 }
 
+#[test]
+fn treasury_pallet_account_not_none() {
+	assert_eq!(
+		RelayTreasuryPalletAccount::get(),
+		LocationToAccountId::convert_location(&RelayTreasuryLocation::get()).unwrap()
+	)
+}
+
 use sp_runtime::Perbill;
 
 // TODO:(PR#159): remove when `[email protected]` bump (https://github.com/polkadot-fellows/runtimes/issues/186)

system-parachains/bridge-hubs/bridge-hub-polkadot/src/xcm_config.rs

@@ -50,7 +50,10 @@ use xcm_builder::{
 	TrailingSetTopicAsId, UsingComponents, WeightInfoBounds, WithComputedOrigin, WithUniqueTopic,
 	XcmFeeManagerFromComponents, XcmFeeToAccount,
 };
-use xcm_executor::{traits::WithOriginFilter, XcmExecutor};
+use xcm_executor::{
+	traits::{ConvertLocation, WithOriginFilter},
+	XcmExecutor,
+};
 
 parameter_types! {
 	pub const DotRelayLocation: Location = Location::parent();
@@ -64,6 +67,11 @@ parameter_types! {
 	pub const GovernanceLocation: Location = Location::parent();
 	pub RelayTreasuryLocation: Location = (Parent, PalletInstance(polkadot_runtime_constants::TREASURY_PALLET_ID)).into();
 	pub TreasuryAccount: AccountId = TREASURY_PALLET_ID.into_account_truncating();
+	// Test [`crate::tests::treasury_pallet_account_not_none`] ensures that the result of location
+	// conversion is not `None`.
+	pub RelayTreasuryPalletAccount: AccountId =
+		LocationToAccountId::convert_location(&RelayTreasuryLocation::get())
+			.unwrap_or(TreasuryAccount::get());
 }
 
 /// Type for specifying how a `Location` can be converted into an `AccountId`. This is used
@@ -285,7 +293,7 @@ impl xcm_executor::Config for XcmConfig {
 	type AssetExchanger = ();
 	type FeeManager = XcmFeeManagerFromComponents<
 		WaivedLocations,
-		XcmFeeToAccount<Self::AssetTransactor, AccountId, TreasuryAccount>,
+		XcmFeeToAccount<Self::AssetTransactor, AccountId, RelayTreasuryPalletAccount>,
 	>;
 	type MessageExporter = ToBridgeHubKusamaHaulBlobExporter;
 	type UniversalAliases = Nothing;

system-parachains/bridge-hubs/bridge-hub-polkadot/tests/tests.rs

@@ -24,7 +24,10 @@ use bridge_hub_polkadot_runtime::{
 		WithBridgeHubKusamaMessageBridge, WithBridgeHubKusamaMessagesInstance,
 		XCM_LANE_FOR_ASSET_HUB_POLKADOT_TO_ASSET_HUB_KUSAMA,
 	},
-	xcm_config::{DotRelayLocation, RelayNetwork, XcmConfig},
+	xcm_config::{
+		DotRelayLocation, LocationToAccountId, RelayNetwork, RelayTreasuryLocation,
+		RelayTreasuryPalletAccount, XcmConfig,
+	},
 	AllPalletsWithoutSystem, BridgeRejectObsoleteHeadersAndMessages, Executive, ExistentialDeposit,
 	ParachainSystem, PolkadotXcm, Runtime, RuntimeCall, RuntimeEvent, RuntimeOrigin, SessionKeys,
 	SignedExtra, TransactionPayment, UncheckedExtrinsic, SLOT_DURATION,
@@ -43,6 +46,7 @@ use system_parachains_constants::polkadot::{
 	consensus::RELAY_CHAIN_SLOT_DURATION_MILLIS, fee::WeightToFee,
 };
 use xcm::latest::prelude::*;
+use xcm_executor::traits::ConvertLocation;
 
 // Para id of sibling chain used in tests.
 pub const SIBLING_PARACHAIN_ID: u32 = 1000;
@@ -361,6 +365,14 @@ pub fn can_calculate_fee_for_complex_message_confirmation_transaction() {
 	)
 }
 
+#[test]
+fn treasury_pallet_account_not_none() {
+	assert_eq!(
+		RelayTreasuryPalletAccount::get(),
+		LocationToAccountId::convert_location(&RelayTreasuryLocation::get()).unwrap()
+	)
+}
+
 // TODO:(PR#159): remove when `[email protected]` bump (https://github.com/polkadot-fellows/runtimes/issues/186)
 /// A helper function for comparing the actual value of a fee constant with its estimated value. The
 /// estimated value can be overestimated (`overestimate_in_percent`), and if the difference to the

system-parachains/collectives/collectives-polkadot/src/xcm_config.rs

@@ -47,7 +47,10 @@ use xcm_builder::{
 	UsingComponents, WithComputedOrigin, WithUniqueTopic, XcmFeeManagerFromComponents,
 	XcmFeeToAccount,
 };
-use xcm_executor::{traits::WithOriginFilter, XcmExecutor};
+use xcm_executor::{
+	traits::{ConvertLocation, WithOriginFilter},
+	XcmExecutor,
+};
 
 parameter_types! {
 	pub const RootLocation: Location = Location::here();
@@ -61,6 +64,11 @@ parameter_types! {
 	pub RelayTreasuryLocation: Location = (Parent, PalletInstance(polkadot_runtime_constants::TREASURY_PALLET_ID)).into();
 	pub TreasuryAccount: AccountId = TREASURY_PALLET_ID.into_account_truncating();
 	pub const TreasurerBodyId: BodyId = BodyId::Treasury;
+	// Test [`treasury_pallet_account_not_none`] ensures that the result of location conversion is
+	// not `None`.
+	pub RelayTreasuryPalletAccount: AccountId =
+		LocationToAccountId::convert_location(&RelayTreasuryLocation::get())
+			.unwrap_or(TreasuryAccount::get());
 }
 
 /// Type for specifying how a `Location` can be converted into an `AccountId`. This is used
@@ -294,7 +302,7 @@ impl xcm_executor::Config for XcmConfig {
 	type AssetExchanger = ();
 	type FeeManager = XcmFeeManagerFromComponents<
 		WaivedLocations,
-		XcmFeeToAccount<Self::AssetTransactor, AccountId, TreasuryAccount>,
+		XcmFeeToAccount<Self::AssetTransactor, AccountId, RelayTreasuryPalletAccount>,
 	>;
 	type MessageExporter = ();
 	type UniversalAliases = Nothing;
@@ -353,3 +361,11 @@ impl cumulus_pallet_xcm::Config for Runtime {
 	type RuntimeEvent = RuntimeEvent;
 	type XcmExecutor = XcmExecutor<XcmConfig>;
 }
+
+#[test]
+fn treasury_pallet_account_not_none() {
+	assert_eq!(
+		RelayTreasuryPalletAccount::get(),
+		LocationToAccountId::convert_location(&RelayTreasuryLocation::get()).unwrap()
+	)
+}