[pallet_xcm] adapt paritytech/polkadot-sdk#2388 (new transfer_assets)

Author: bkontur

relay/kusama/src/lib.rs

@@ -2364,6 +2364,20 @@ sp_api::impl_runtime_apis! {
 						crate::Junction::Parachain(43211234).into(),
 					))
 				}
+
+				fn set_up_complex_asset_transfer(
+				) -> Option<(MultiAssets, u32, MultiLocation, Box<dyn FnOnce()>)> {
+					// Relay supports only native token, either reserve transfer it to non-system parachains,
+					// or teleport it to system parachain. Use the teleport case for benchmarking as it's
+					// slightly heavier.
+					// Relay/native token can be teleported to/from AH.
+					let native_location = Here.into();
+					let dest = crate::xcm_config::AssetHubLocation::get();
+					pallet_xcm::benchmarking::helpers::native_teleport_as_asset_transfer::<Runtime>(
+						native_location,
+						dest
+					)
+				}
 			}
 
 			parameter_types! {

relay/kusama/src/weights/pallet_xcm.rs

@@ -2354,6 +2354,20 @@ sp_api::impl_runtime_apis! {
 						crate::Junction::Parachain(43211234).into(),
 					))
 				}
+
+				fn set_up_complex_asset_transfer(
+				) -> Option<(MultiAssets, u32, MultiLocation, Box<dyn FnOnce()>)> {
+					// Relay supports only native token, either reserve transfer it to non-system parachains,
+					// or teleport it to system parachain. Use the teleport case for benchmarking as it's
+					// slightly heavier.
+					// Relay/native token can be teleported to/from AH.
+					let native_location = Here.into();
+					let dest = crate::xcm_config::AssetHubLocation::get();
+					pallet_xcm::benchmarking::helpers::native_teleport_as_asset_transfer::<Runtime>(
+						native_location,
+						dest
+					)
+				}
 			}
 
 			parameter_types! {

relay/polkadot/src/lib.rs

@@ -1306,6 +1306,55 @@ impl_runtime_apis! {
 						ParentThen(Parachain(random_para_id).into()).into(),
 					))
 				}
+
+				fn set_up_complex_asset_transfer(
+				) -> Option<(MultiAssets, u32, MultiLocation, Box<dyn FnOnce()>)> {
+					// Transfer to Relay some local AH asset (local-reserve-transfer) while paying
+					// fees using teleported native token.
+					// (We don't care that Relay doesn't accept incoming unknown AH local asset)
+					let dest = Parent.into();
+
+					let fee_amount = EXISTENTIAL_DEPOSIT;
+					let fee_asset: MultiAsset = (MultiLocation::parent(), fee_amount).into();
+
+					let who = frame_benchmarking::whitelisted_caller();
+					// Give some multiple of the existential deposit
+					let balance = fee_amount + EXISTENTIAL_DEPOSIT * 1000;
+					let _ = <Balances as frame_support::traits::Currency<_>>::make_free_balance_be(
+						&who, balance,
+					);
+					// verify initial balance
+					assert_eq!(Balances::free_balance(&who), balance);
+
+					// set up local asset
+					let asset_amount = 10u128;
+					let initial_asset_amount = asset_amount * 10;
+					let (asset_id, _, _) = pallet_assets::benchmarking::create_default_minted_asset::<
+						Runtime,
+						pallet_assets::Instance1
+					>(true, initial_asset_amount);
+					let asset_location = MultiLocation::new(
+						0,
+						X2(PalletInstance(50), GeneralIndex(u32::from(asset_id).into()))
+					);
+					let transfer_asset: MultiAsset = (asset_location, asset_amount).into();
+
+					let assets: MultiAssets = vec![fee_asset.clone(), transfer_asset].into();
+					let fee_index = if assets.get(0).unwrap().eq(&fee_asset) { 0 } else { 1 };
+
+					// verify transferred successfully
+					let verify = Box::new(move || {
+						// verify native balance after transfer, decreased by transferred fee amount
+						// (plus transport fees)
+						assert!(Balances::free_balance(&who) <= balance - fee_amount);
+						// verify asset balance decreased by exactly transferred amount
+						assert_eq!(
+							Assets::balance(asset_id.into(), &who),
+							initial_asset_amount - asset_amount,
+						);
+					});
+					Some((assets, fee_index as u32, dest, verify))
+				}
 			}
 
 			parameter_types! {

relay/polkadot/src/weights/pallet_xcm.rs

@@ -1197,6 +1197,55 @@ impl_runtime_apis! {
 						ParentThen(Parachain(random_para_id).into()).into(),
 					))
 				}
+
+				fn set_up_complex_asset_transfer(
+				) -> Option<(MultiAssets, u32, MultiLocation, Box<dyn FnOnce()>)> {
+					// Transfer to Relay some local AH asset (local-reserve-transfer) while paying
+					// fees using teleported native token.
+					// (We don't care that Relay doesn't accept incoming unknown AH local asset)
+					let dest = Parent.into();
+
+					let fee_amount = EXISTENTIAL_DEPOSIT;
+					let fee_asset: MultiAsset = (MultiLocation::parent(), fee_amount).into();
+
+					let who = frame_benchmarking::whitelisted_caller();
+					// Give some multiple of the existential deposit
+					let balance = fee_amount + EXISTENTIAL_DEPOSIT * 1000;
+					let _ = <Balances as frame_support::traits::Currency<_>>::make_free_balance_be(
+						&who, balance,
+					);
+					// verify initial balance
+					assert_eq!(Balances::free_balance(&who), balance);
+
+					// set up local asset
+					let asset_amount = 10u128;
+					let initial_asset_amount = asset_amount * 10;
+					let (asset_id, _, _) = pallet_assets::benchmarking::create_default_minted_asset::<
+						Runtime,
+						pallet_assets::Instance1
+					>(true, initial_asset_amount);
+					let asset_location = MultiLocation::new(
+						0,
+						X2(PalletInstance(50), GeneralIndex(u32::from(asset_id).into()))
+					);
+					let transfer_asset: MultiAsset = (asset_location, asset_amount).into();
+
+					let assets: MultiAssets = vec![fee_asset.clone(), transfer_asset].into();
+					let fee_index = if assets.get(0).unwrap().eq(&fee_asset) { 0 } else { 1 };
+
+					// verify transferred successfully
+					let verify = Box::new(move || {
+						// verify native balance after transfer, decreased by transferred fee amount
+						// (plus transport fees)
+						assert!(Balances::free_balance(&who) <= balance - fee_amount);
+						// verify asset balance decreased by exactly transferred amount
+						assert_eq!(
+							Assets::balance(asset_id.into(), &who),
+							initial_asset_amount - asset_amount,
+						);
+					});
+					Some((assets, fee_index as u32, dest, verify))
+				}
 			}
 
 			parameter_types! {

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

@@ -795,6 +795,18 @@ impl_runtime_apis! {
 					// Reserve transfers are disabled on BH.
 					None
 				}
+
+				fn set_up_complex_asset_transfer(
+				) -> Option<(MultiAssets, u32, MultiLocation, Box<dyn FnOnce()>)> {
+					// BH only supports teleports to system parachain.
+					// Relay/native token can be teleported between BH and Relay.
+					let native_location = Parent.into();
+					let dest = Parent.into();
+					pallet_xcm::benchmarking::helpers::native_teleport_as_asset_transfer::<Runtime>(
+						native_location,
+						dest
+					)
+				}
 			}
 
 			parameter_types! {