Statemint runtimes to accept sufficient assets as xcm fee payment (#1278)

* point to my branch * girazoki-add-TakeFirstAssetTrader-to-utility * Commit lock * point at custom branch * add new trader to statemine runtimes * compiles * Back to master * Update last tomls * Imports up * remove non-needing imports * FMT * log messages properly * Use TakeRevenue instead of HandleCredit * Introduce xcm fee handler * check total supply in tests * FMT * fix test * Start decoupling balance calculation into different traits * Make traits a bit more generic * PR suggestions * add import * import well * Place xcmfeesassethandler into parachains common * fix tests * config parameters * Min amount to fee receiver * Make minimum amount for block author to be at least the ED * Doc in AssetFeeAsExistentialDepositMultiplier * saturating sub * make sure we dont enter twice * FMT * fmt again * adapt tests * Add doc and struct for weight refund * Doc * More doc * PR suggestions * store all info related to asset payment as multiasset * return AssetNotFound instead of TooExpensive * Use asset transactor to deposit fee * uninstall from statemint * R for RUntime and CON for BalanceConverter * Rework logic to avoid unnecesary match and error * Rework ED check, also in case of refund * rework typo * In case refund makes drop below ED, just refund the difference * fix test westmint * clone id * move test imports to preamble * move test imports to preamble * test-utils with builderS * lock file updated * remove unused imports Co-authored-by: Stephen Shelton <steve@brewcraft.org> Co-authored-by: joe petrowski <25483142+joepetrowski@users.noreply.github.com> Co-authored-by: joepetrowski <joe@parity.io>
2026-04-26 13:27:57 +00:00 · 2022-08-03 18:04:13 +02:00
parent acc409cd0a
commit 4d04eebb44
16 changed files with 1209 additions and 11 deletions
@@ -1,5 +1,10 @@
+use crate::impls::AccountIdOf;
 use core::marker::PhantomData;
-use frame_support::{log, weights::Weight};
+use frame_support::{
+	log,
+	traits::{fungibles::Inspect, tokens::BalanceConversion},
+	weights::{Weight, WeightToFee, WeightToFeePolynomial},
+};
 use xcm::latest::prelude::*;
 use xcm_executor::traits::ShouldExecute;

@@ -66,3 +71,39 @@ impl ShouldExecute for DenyReserveTransferToRelayChain {
 		Ok(())
 	}
 }
+
+/// A `ChargeFeeInFungibles` implementation that converts the output of
+/// a given WeightToFee implementation an amount charged in
+/// a particular assetId from pallet-assets
+pub struct AssetFeeAsExistentialDepositMultiplier<Runtime, WeightToFee, BalanceConverter>(
+	PhantomData<(Runtime, WeightToFee, BalanceConverter)>,
+);
+impl<CurrencyBalance, Runtime, WeightToFee, BalanceConverter>
+	cumulus_primitives_utility::ChargeWeightInFungibles<
+		AccountIdOf<Runtime>,
+		pallet_assets::Pallet<Runtime>,
+	> for AssetFeeAsExistentialDepositMultiplier<Runtime, WeightToFee, BalanceConverter>
+where
+	Runtime: pallet_assets::Config,
+	WeightToFee: WeightToFeePolynomial<Balance = CurrencyBalance>,
+	BalanceConverter: BalanceConversion<
+		CurrencyBalance,
+		<Runtime as pallet_assets::Config>::AssetId,
+		<Runtime as pallet_assets::Config>::Balance,
+	>,
+	AccountIdOf<Runtime>:
+		From<polkadot_primitives::v2::AccountId> + Into<polkadot_primitives::v2::AccountId>,
+{
+	fn charge_weight_in_fungibles(
+		asset_id: <pallet_assets::Pallet<Runtime> as Inspect<AccountIdOf<Runtime>>>::AssetId,
+		weight: Weight,
+	) -> Result<<pallet_assets::Pallet<Runtime> as Inspect<AccountIdOf<Runtime>>>::Balance, XcmError>
+	{
+		let amount = WeightToFee::weight_to_fee(&weight);
+		// If the amount gotten is not at least the ED, then make it be the ED of the asset
+		// This is to avoid burning assets and decreasing the supply
+		let asset_amount = BalanceConverter::to_asset_balance(amount, asset_id)
+			.map_err(|_| XcmError::TooExpensive)?;
+		Ok(asset_amount)
+	}
+}