`94b124f78550`

source

pallets/inflation/src/lib.rs4.0 KiBsource history
1//2// This file is subject to the terms and conditions defined in3// file 'LICENSE', which is part of this source code package.4//56#![recursion_limit = "1024"]7#![cfg_attr(not(feature = "std"), no_std)]89#[cfg(feature = "std")]10pub use std::*;1112pub use serde::{Serialize, Deserialize};1314#[cfg(feature = "runtime-benchmarks")]15mod benchmarking;1617#[cfg(test)]18mod tests;1920pub use frame_support::{21	construct_runtime, decl_module, decl_storage, ensure,22	traits::{23		Currency, ExistenceRequirement, Get, Imbalance, KeyOwnerProofSystem, OnUnbalanced,24		Randomness, IsSubType, WithdrawReasons,25	},26	weights::{27		constants::{BlockExecutionWeight, ExtrinsicBaseWeight, RocksDbWeight, WEIGHT_PER_SECOND},28		DispatchInfo, GetDispatchInfo, IdentityFee, Pays, PostDispatchInfo, Weight,29		WeightToFeePolynomial, DispatchClass,30	},31	StorageValue, transactional,32};3334// #[cfg(feature = "runtime-benchmarks")]35pub use frame_support::dispatch::DispatchResult;3637use sp_runtime::{38	Perbill,39	traits::{BlockNumberProvider, Zero},40};41use sp_std::convert::TryInto;4243use frame_system::{self as system};4445/// The balance type of this module.46pub type BalanceOf<T> =47	<<T as Config>::Currency as Currency<<T as frame_system::Config>::AccountId>>::Balance;4849// pub const YEAR: u32 = 5_259_600; // 6-second block50pub const YEAR: u32 = 2_629_800; // 12-second block51pub const TOTAL_YEARS_UNTIL_FLAT: u32 = 9;52pub const START_INFLATION_PERCENT: u32 = 10;53pub const END_INFLATION_PERCENT: u32 = 4;5455pub trait Config: system::Config {56	type Currency: Currency<Self::AccountId>;57	type TreasuryAccountId: Get<Self::AccountId>;58	type InflationBlockInterval: Get<Self::BlockNumber>;5960	// The block number provider61	type BlockNumberProvider: BlockNumberProvider<BlockNumber = Self::BlockNumber>;62}6364decl_storage! {65	trait Store for Module<T: Config> as Inflation {66		/// starting year total issuance67		pub StartingYearTotalIssuance get(fn starting_year_total_issuance): BalanceOf<T>;6869		/// Current block inflation70		pub BlockInflation get(fn block_inflation): BalanceOf<T>;71	}72}7374decl_module! {75	pub struct Module<T: Config> for enum Call76	where77		origin: T::Origin,78	{79		const InflationBlockInterval: T::BlockNumber = T::InflationBlockInterval::get();8081		fn on_initialize() -> Weight82		{83			let mut consumed_weight = 0;84			let mut add_weight = |reads, writes, weight| {85				consumed_weight += T::DbWeight::get().reads_writes(reads, writes);86				consumed_weight += weight;87			};8889			let block_interval: u32 = T::InflationBlockInterval::get().try_into().unwrap_or(0);90			let _now = T::BlockNumberProvider::current_block_number();9192			// Recalculate inflation on the first block of the year (or if it is not initialized yet)93			if (_now % T::BlockNumber::from(YEAR)).is_zero() || <BlockInflation<T>>::get().is_zero() {94				let current_year: u32 = (_now / T::BlockNumber::from(YEAR)).try_into().unwrap_or(0);9596				let one_percent = Perbill::from_percent(1);9798				if current_year <= TOTAL_YEARS_UNTIL_FLAT {99					let amount: BalanceOf<T> = Perbill::from_rational(100						block_interval * (START_INFLATION_PERCENT * TOTAL_YEARS_UNTIL_FLAT - current_year * (START_INFLATION_PERCENT - END_INFLATION_PERCENT)),101						YEAR * TOTAL_YEARS_UNTIL_FLAT102					) * ( one_percent * T::Currency::total_issuance() );103					<BlockInflation<T>>::put(amount);104				}105				else {106					let amount: BalanceOf<T> = Perbill::from_rational(107						block_interval * END_INFLATION_PERCENT,108						YEAR109					) * (one_percent * T::Currency::total_issuance());110					<BlockInflation<T>>::put(amount);111				}112				<StartingYearTotalIssuance<T>>::set(T::Currency::total_issuance());113114				// First time deposit115				T::Currency::deposit_creating(&T::TreasuryAccountId::get(), <BlockInflation<T>>::get());116117				add_weight(7, 6, 28_300_000);118			}119120			// Apply inflation every InflationBlockInterval blocks and in the 1st block to initialize Treasury account121			else if (_now % T::BlockNumber::from(block_interval)).is_zero() {122				T::Currency::deposit_into_existing(&T::TreasuryAccountId::get(), <BlockInflation<T>>::get()).ok();123124				add_weight(3, 2, 12_900_000);125			}126127			consumed_weight128		}129130	}131}