Add XcmPayment runtime API

Cargo.toml

@@ -311,6 +311,7 @@ polkadot-runtime-parachains = { git = "https://github.com/moonbeam-foundation/po
 xcm = { package = "staging-xcm", git = "https://github.com/moonbeam-foundation/polkadot-sdk", branch = "moonbeam-polkadot-v1.11.0", default-features = false }
 xcm-builder = { package = "staging-xcm-builder", git = "https://github.com/moonbeam-foundation/polkadot-sdk", branch = "moonbeam-polkadot-v1.11.0", default-features = false }
 xcm-executor = { package = "staging-xcm-executor", git = "https://github.com/moonbeam-foundation/polkadot-sdk", branch = "moonbeam-polkadot-v1.11.0", default-features = false }
+xcm-fee-payment-runtime-api = { git = "https://github.com/moonbeam-foundation/polkadot-sdk", branch = "moonbeam-polkadot-v1.11.0", default-features = false }
 
 # Polkadot / XCM (client)
 #kusama-runtime = { package = "staging-kusama-runtime", git = "https://github.com/moonbeam-foundation/polkadot-sdk", branch = "moonbeam-polkadot-v1.11.0" }

node/service/Cargo.toml

@@ -144,6 +144,7 @@ polkadot-parachain = { workspace = true }
 polkadot-primitives = { workspace = true }
 polkadot-service = { workspace = true }
 xcm = { workspace = true }
+xcm-fee-payment-runtime-api = { workspace = true }
 
 # Benchmarking
 frame-benchmarking = { workspace = true, features = ["std"] }

node/service/src/client.rs

@@ -47,6 +47,7 @@ pub trait RuntimeApiCollection:
 	+ cumulus_primitives_core::CollectCollationInfo<Block>
 	+ session_keys_primitives::VrfApi<Block>
 	+ async_backing_primitives::UnincludedSegmentApi<Block>
+	+ xcm_fee_payment_runtime_api::XcmPaymentApi<Block>
 {
 }
 
@@ -67,6 +68,7 @@ impl<Api> RuntimeApiCollection for Api where
 		+ cumulus_primitives_core::CollectCollationInfo<Block>
 		+ session_keys_primitives::VrfApi<Block>
 		+ async_backing_primitives::UnincludedSegmentApi<Block>
+		+ xcm_fee_payment_runtime_api::XcmPaymentApi<Block>
 {
 }
 

runtime/common/Cargo.toml

@@ -76,6 +76,7 @@ pallet-author-slot-filter = { workspace = true }
 xcm = { workspace = true }
 xcm-builder = { workspace = true }
 xcm-executor = { workspace = true }
+xcm-fee-payment-runtime-api = { workspace = true }
 
 # Parity
 parity-scale-codec = { workspace = true }
@@ -111,6 +112,7 @@ std = [
 	"sp-std/std",
 	"sp-genesis-builder/std",
 	"xcm-executor/std",
+	"xcm-fee-payment-runtime-api/std",
 	"xcm/std",
 	"account/std",
 ]

runtime/common/src/apis.rs

@@ -741,6 +741,86 @@ macro_rules! impl_runtime_apis_plus_common {
 				}
 			}
 
+			impl xcm_fee_payment_runtime_api::XcmPaymentApi<Block> for Runtime {
+				fn query_acceptable_payment_assets(
+					xcm_version: xcm::Version
+				) -> Result<Vec<VersionedAssetId>, XcmPaymentApiError> {
+					if !matches!(xcm_version, 3) {
+						return Err(XcmPaymentApiError::UnhandledXcmVersion);
+					}
+
+					let self_reserve_location: Location = Location::try_from(xcm_config::SelfReserve::get())
+						.map_err(|_| XcmPaymentApiError::VersionedConversionFailed)?;
+
+					Ok([VersionedAssetId::V3(XcmAssetId::from(self_reserve_location))]
+						.into_iter()
+						.chain(
+							pallet_asset_manager::AssetTypeId::<Runtime>::iter_keys().filter_map(|asset_location| {
+								if !AssetManager::payment_is_supported(asset_location.clone()) {
+									return None;
+								}
+
+								let location: Option<Location> = asset_location.into();
+								if let Some(loc) = location {
+									return Some(VersionedAssetId::V3(loc.into()))
+								}
+								None
+							})
+						)
+						.filter_map(|asset| asset.into_version(xcm_version).ok())
+						.collect())
+				}
+
+				fn query_weight_to_asset_fee(
+					weight: Weight, asset: VersionedAssetId
+				) -> Result<u128, XcmPaymentApiError> {
+					let self_reserve_location: Location = Location::try_from(xcm_config::SelfReserve::get())
+						.map_err(|_| XcmPaymentApiError::VersionedConversionFailed)?;
+
+					let local_asset = VersionedAssetId::V3(XcmAssetId::from(self_reserve_location));
+					let asset = asset
+						.into_version(3)
+						.map_err(|_| XcmPaymentApiError::VersionedConversionFailed)?;
+
+					if asset == local_asset {
+						Ok(TransactionPayment::weight_to_fee(weight))
+					}else {
+						let asset_v3: XcmAssetId = asset.try_into()
+							.map_err(|_| XcmPaymentApiError::VersionedConversionFailed)?;
+
+						if let XcmAssetId::Concrete(asset_location) = asset_v3 {
+							let asset_type: AssetType = AssetType::from(asset_location);
+							if !AssetManager::payment_is_supported(asset_type.clone()) {
+								return Err(XcmPaymentApiError::AssetNotFound);
+							}
+
+							let units_per_sec = AssetManager::get_units_per_second(asset_type);
+							if let None = units_per_sec {
+								return Err(XcmPaymentApiError::WeightNotComputable);
+							}
+
+							let final_asset_fee = units_per_sec
+								.unwrap_or_default()
+								.saturating_mul(weight.ref_time() as u128)
+									/ (WEIGHT_REF_TIME_PER_SECOND as u128);
+
+							return Ok(final_asset_fee)
+						}
+						Err(XcmPaymentApiError::AssetNotFound)
+					}
+				}
+
+				fn query_xcm_weight(message: VersionedXcm<()>) -> Result<Weight, XcmPaymentApiError> {
+					PolkadotXcm::query_xcm_weight(message)
+				}
+
+				fn query_delivery_fees(
+					destination: VersionedLocation, message: VersionedXcm<()>
+				) -> Result<VersionedAssets, XcmPaymentApiError> {
+					PolkadotXcm::query_delivery_fees(destination, message)
+				}
+			}
+
 			#[cfg(feature = "runtime-benchmarks")]
 			impl frame_benchmarking::Benchmark<Block> for Runtime {
 

runtime/moonbase/Cargo.toml

@@ -149,6 +149,7 @@ polkadot-runtime-common = { workspace = true }
 xcm = { workspace = true }
 xcm-builder = { workspace = true }
 xcm-executor = { workspace = true }
+xcm-fee-payment-runtime-api = { workspace = true }
 
 # Cumulus
 cumulus-pallet-dmp-queue = { workspace = true }
@@ -307,6 +308,7 @@ std = [
 	"strum/std",
 	"xcm-builder/std",
 	"xcm-executor/std",
+	"xcm-fee-payment-runtime-api/std",
 	"xcm-primitives/std",
 	"xcm/std",
 ]

runtime/moonbase/src/lib.rs

@@ -118,6 +118,13 @@ use sp_std::{
 #[cfg(feature = "std")]
 use sp_version::NativeVersion;
 use sp_version::RuntimeVersion;
+use xcm::{
+	v3::{AssetId as XcmAssetId, Location},
+	IntoVersion, VersionedAssetId, VersionedAssets, VersionedLocation, VersionedXcm,
+};
+use xcm_config::AssetType;
+use xcm_fee_payment_runtime_api::Error as XcmPaymentApiError;
+use xcm_primitives::UnitsToWeightRatio;
 
 use smallvec::smallvec;
 use sp_runtime::serde::{Deserialize, Serialize};

runtime/moonbeam/Cargo.toml

@@ -145,6 +145,7 @@ polkadot-parachain = { workspace = true }
 xcm = { workspace = true }
 xcm-builder = { workspace = true }
 xcm-executor = { workspace = true }
+xcm-fee-payment-runtime-api = { workspace = true }
 
 # Cumulus
 cumulus-pallet-dmp-queue = { workspace = true }
@@ -298,6 +299,7 @@ std = [
 	"strum/std",
 	"xcm-builder/std",
 	"xcm-executor/std",
+	"xcm-fee-payment-runtime-api/std",
 	"xcm-primitives/std",
 	"xcm/std",
 ]

runtime/moonbeam/src/lib.rs

@@ -99,6 +99,13 @@ use sp_runtime::{
 	Perquintill, SaturatedConversion,
 };
 use sp_std::{convert::TryFrom, prelude::*};
+use xcm::{
+	v3::{AssetId as XcmAssetId, Location},
+	IntoVersion, VersionedAssetId, VersionedAssets, VersionedLocation, VersionedXcm,
+};
+use xcm_config::AssetType;
+use xcm_fee_payment_runtime_api::Error as XcmPaymentApiError;
+use xcm_primitives::UnitsToWeightRatio;
 
 #[cfg(feature = "std")]
 use sp_version::NativeVersion;

runtime/moonriver/Cargo.toml

@@ -145,6 +145,7 @@ polkadot-runtime-common = { workspace = true }
 xcm = { workspace = true }
 xcm-builder = { workspace = true }
 xcm-executor = { workspace = true }
+xcm-fee-payment-runtime-api = { workspace = true }
 pallet-message-queue = { workspace = true }
 
 # Cumulus
@@ -298,6 +299,7 @@ std = [
 	"strum/std",
 	"xcm-builder/std",
 	"xcm-executor/std",
+	"xcm-fee-payment-runtime-api/std",
 	"xcm-primitives/std",
 	"xcm/std",
 ]

runtime/moonriver/src/lib.rs

@@ -99,6 +99,13 @@ use sp_runtime::{
 	Perquintill, SaturatedConversion,
 };
 use sp_std::{convert::TryFrom, prelude::*};
+use xcm::{
+	v3::{AssetId as XcmAssetId, Location},
+	IntoVersion, VersionedAssetId, VersionedAssets, VersionedLocation, VersionedXcm,
+};
+use xcm_config::AssetType;
+use xcm_fee_payment_runtime_api::Error as XcmPaymentApiError;
+use xcm_primitives::UnitsToWeightRatio;
 
 use smallvec::smallvec;
 #[cfg(feature = "std")]