add FeeMultiplierUpdate (#249)

runtime/asgard/src/lib.rs

@@ -72,9 +72,12 @@ use xcm_support::Get;
 /// Constant values used within the runtime.
 pub mod constants;
 use bifrost_flexible_fee::fee_dealer::{FeeDealer, FixedCurrencyFeeRate};
-use bifrost_runtime_common::xcm_impl::{
-	BifrostAccountIdToMultiLocation, BifrostAssetMatcher, BifrostCurrencyIdConvert,
-	BifrostFilteredAssets, BifrostXcmTransactFilter,
+use bifrost_runtime_common::{
+	xcm_impl::{
+		BifrostAccountIdToMultiLocation, BifrostAssetMatcher, BifrostCurrencyIdConvert,
+		BifrostFilteredAssets, BifrostXcmTransactFilter,
+	},
+	SlowAdjustingFeeUpdate,
 };
 use codec::{Decode, Encode};
 use constants::{currency::*, time::*};
@@ -638,7 +641,7 @@ impl pallet_tips::Config for Runtime {
 }
 
 impl pallet_transaction_payment::Config for Runtime {
-	type FeeMultiplierUpdate = ();
+	type FeeMultiplierUpdate = SlowAdjustingFeeUpdate<Self>;
 	type OnChargeTransaction = FlexibleFee;
 	type TransactionByteFee = TransactionByteFee;
 	type WeightToFee = IdentityFee<Balance>;

runtime/bifrost/src/lib.rs

@@ -63,8 +63,12 @@ use static_assertions::const_assert;
 /// Constant values used within the runtime.
 pub mod constants;
 use bifrost_flexible_fee::fee_dealer::{FeeDealer, FixedCurrencyFeeRate};
-use bifrost_runtime_common::xcm_impl::{
-	BifrostAssetMatcher, BifrostCurrencyIdConvert, BifrostFilteredAssets, BifrostXcmTransactFilter,
+use bifrost_runtime_common::{
+	xcm_impl::{
+		BifrostAccountIdToMultiLocation, BifrostAssetMatcher, BifrostCurrencyIdConvert,
+		BifrostFilteredAssets, BifrostXcmTransactFilter,
+	},
+	SlowAdjustingFeeUpdate,
 };
 use constants::{currency::*, time::*};
 use cumulus_primitives_core::ParaId as CumulusParaId;
@@ -522,7 +526,7 @@ impl pallet_tips::Config for Runtime {
 }
 
 impl pallet_transaction_payment::Config for Runtime {
-	type FeeMultiplierUpdate = ();
+	type FeeMultiplierUpdate = SlowAdjustingFeeUpdate<Self>;
 	type OnChargeTransaction = FlexibleFee;
 	type TransactionByteFee = TransactionByteFee;
 	type WeightToFee = IdentityFee<Balance>;

runtime/common/Cargo.toml

@@ -33,6 +33,7 @@ frame-support = { version = "3.0.0", default-features = false }
 frame-system = { version = "3.0.0", default-features = false }
 frame-system-rpc-runtime-api = { version = "3.0.0", default-features = false }
 max-encoded-len = { version = "3.0.0", default-features = false }
+pallet-transaction-payment = { version = "3.0.0", default-features = false }
 
 # Cumulus dependencies
 cumulus-pallet-parachain-system = { git = "https://github.com/paritytech/cumulus", default-features = false, branch = "polkadot-v0.9.8" }
@@ -100,4 +101,5 @@ std = [
 	"xcm-support/std",
 	"zenlink-protocol/std",
 	"zenlink-protocol-runtime-api/std",
+	"pallet-transaction-payment/std"
 ]

runtime/common/src/lib.rs

@@ -17,8 +17,10 @@
 // along with this program. If not, see <https://www.gnu.org/licenses/>.
 
 #![cfg_attr(not(feature = "std"), no_std)]
-use frame_support::sp_runtime::offchain::storage_lock::BlockNumberProvider;
+use frame_support::{parameter_types, sp_runtime::offchain::storage_lock::BlockNumberProvider};
 use node_primitives::BlockNumber;
+use pallet_transaction_payment::{Multiplier, TargetedFeeAdjustment};
+use sp_runtime::{FixedPointNumber, Perquintill};
 
 pub mod xcm_impl;
 
@@ -35,3 +37,19 @@ impl<T: cumulus_pallet_parachain_system::Config> BlockNumberProvider
 			.unwrap_or_default()
 	}
 }
+
+parameter_types! {
+	/// The portion of the `NORMAL_DISPATCH_RATIO` that we adjust the fees with. Blocks filled less
+	/// than this will decrease the weight and more will increase.
+	pub const TargetBlockFullness: Perquintill = Perquintill::from_percent(25);
+	/// The adjustment variable of the runtime. Higher values will cause `TargetBlockFullness` to
+	/// change the fees more rapidly.
+	pub AdjustmentVariable: Multiplier = Multiplier::saturating_from_rational(3, 100_000);
+	/// Minimum amount of the multiplier. This value cannot be too low. A test case should ensure
+	/// that combined with `AdjustmentVariable`, we can recover from the minimum.
+	/// See `multiplier_can_grow_from_zero`.
+	pub MinimumMultiplier: Multiplier = Multiplier::saturating_from_rational(1, 1_000_000u128);
+}
+
+pub type SlowAdjustingFeeUpdate<R> =
+	TargetedFeeAdjustment<R, TargetBlockFullness, AdjustmentVariable, MinimumMultiplier>;

runtime/dev/src/lib.rs

@@ -77,9 +77,12 @@ use xcm_support::Get;
 /// Constant values used within the runtime.
 pub mod constants;
 use bifrost_flexible_fee::fee_dealer::{FeeDealer, FixedCurrencyFeeRate};
-use bifrost_runtime_common::xcm_impl::{
-	BifrostAccountIdToMultiLocation, BifrostAssetMatcher, BifrostCurrencyIdConvert,
-	BifrostFilteredAssets, BifrostXcmTransactFilter,
+use bifrost_runtime_common::{
+	xcm_impl::{
+		BifrostAccountIdToMultiLocation, BifrostAssetMatcher, BifrostCurrencyIdConvert,
+		BifrostFilteredAssets, BifrostXcmTransactFilter,
+	},
+	SlowAdjustingFeeUpdate,
 };
 use codec::{Decode, Encode};
 use constants::{currency::*, time::*};
@@ -640,7 +643,7 @@ impl pallet_tips::Config for Runtime {
 }
 
 impl pallet_transaction_payment::Config for Runtime {
-	type FeeMultiplierUpdate = ();
+	type FeeMultiplierUpdate = SlowAdjustingFeeUpdate<Self>;
 	type OnChargeTransaction = FlexibleFee;
 	type TransactionByteFee = TransactionByteFee;
 	type WeightToFee = IdentityFee<Balance>;