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Adjust fees to network load. #8

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May 30, 2024
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Adjust fees to network load. #8

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23 changes: 18 additions & 5 deletions runtime/src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -16,8 +16,8 @@ use sp_api::impl_runtime_apis;
use sp_core::{crypto::KeyTypeId, H160, H256, OpaqueMetadata};
use sp_runtime::{create_runtime_str, generic, impl_opaque_keys, traits::{
AccountIdConversion, BlakeTwo256, Block as BlockT, ConvertInto, IdentifyAccount,
IdentityLookup, One, Verify
}, transaction_validity::{TransactionSource, TransactionValidity}, ApplyExtrinsicResult, MultiSignature};
IdentityLookup, One, Verify, Bounded,
}, transaction_validity::{TransactionSource, TransactionValidity}, ApplyExtrinsicResult, MultiSignature, Perquintill, FixedPointNumber};

use sp_std::prelude::*;
#[cfg(feature = "std")]
Expand Down Expand Up @@ -46,7 +46,7 @@ use frame_system::{
limits::{BlockLength, BlockWeights},
EnsureRoot,
};
use pallet_transaction_payment::{ConstFeeMultiplier, CurrencyAdapter, Multiplier};
use pallet_transaction_payment::{CurrencyAdapter, Multiplier, TargetedFeeAdjustment};
use pallet_xcm::{EnsureXcm, IsVoiceOfBody};
use parachains_common::message_queue::{NarrowOriginToSibling, ParaIdToSibling};
pub use sp_consensus_aura::sr25519::AuthorityId as AuraId;
Expand Down Expand Up @@ -444,7 +444,10 @@ impl OnUnbalanced<NegativeImbalance> for DealWithInclusionFees {
pub type WeightToFee = ConstantMultiplier<Balance, WeightToFeeMultiplier>;

parameter_types! {
pub FeeMultiplier: Multiplier = Multiplier::one();
pub const TargetBlockFullness: Perquintill = Perquintill::from_percent(25);
pub AdjustmentVariable: Multiplier = Multiplier::saturating_from_rational(75, 1000_000);
pub MinimumMultiplier: Multiplier = Multiplier::one();
pub MaximumMultiplier: Multiplier = Bounded::max_value();

// The multiplier is set such as inclusion fees are ~2 LGNT on average.
// Spreadsheet in /docs/inclusion_fees.ods contains the model that lead
Expand All @@ -455,13 +458,23 @@ parameter_types! {
pub const WeightToFeeMultiplier: Balance = 5_089_484_898;
}

/// This instance of TargetedFeeAdjustment is basically the same as
/// `polkadot_runtime_common::SlowAdjustingFeeUpdate`, with MinimumMultiplier = 1.
pub type SlowAdjustingFeeUpdate<R> = TargetedFeeAdjustment<
R,
TargetBlockFullness,
AdjustmentVariable,
MinimumMultiplier,
MaximumMultiplier,
>;

impl pallet_transaction_payment::Config for Runtime {
type RuntimeEvent = RuntimeEvent;
type OnChargeTransaction = CurrencyAdapter<Balances, DealWithInclusionFees>;
type OperationalFeeMultiplier = ConstU8<5>;
type WeightToFee = ConstantMultiplier<Balance, WeightToFeeMultiplier>;
type LengthToFee = ConstantMultiplier<Balance, WeightToFeeMultiplier>;
type FeeMultiplierUpdate = ConstFeeMultiplier<FeeMultiplier>;
type FeeMultiplierUpdate = SlowAdjustingFeeUpdate<Self>;
}

parameter_types! {
Expand Down
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