`f8774b896e5b`

source

pallets/inflation/src/lib.rs3.8 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::{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;4849pub const YEAR: u32 = 5_259_600;50pub const TOTAL_YEARS_UNTIL_FLAT: u32 = 9;51pub const START_INFLATION_PERCENT: u32 = 10;52pub const END_INFLATION_PERCENT: u32 = 4;5354pub trait Config: system::Config {55	type Currency: Currency<Self::AccountId>;56	type TreasuryAccountId: Get<Self::AccountId>;57	type InflationBlockInterval: Get<Self::BlockNumber>;58}5960decl_storage! {61	trait Store for Module<T: Config> as Inflation {62		/// starting year total issuance63		pub StartingYearTotalIssuance get(fn starting_year_total_issuance): BalanceOf<T>;6465		/// Current block inflation66		pub BlockInflation get(fn block_inflation): BalanceOf<T>;67	}68}6970decl_module! {71	pub struct Module<T: Config> for enum Call72	where73		origin: T::Origin,74	{75		const InflationBlockInterval: T::BlockNumber = T::InflationBlockInterval::get();7677		fn on_initialize(now: T::BlockNumber) -> Weight78		{79			let mut consumed_weight = 0;80			let mut add_weight = |reads, writes, weight| {81				consumed_weight += T::DbWeight::get().reads_writes(reads, writes);82				consumed_weight += weight;83			};8485			let block_interval: u32 = T::InflationBlockInterval::get().try_into().unwrap_or(0);8687			// Recalculate inflation on the first block of the year (or if it is not initialized yet)88			if (now % T::BlockNumber::from(YEAR)).is_zero() || <BlockInflation<T>>::get().is_zero() {89				let current_year: u32 = (now / T::BlockNumber::from(YEAR)).try_into().unwrap_or(0);9091				let one_percent = Perbill::from_percent(1);9293				if current_year <= TOTAL_YEARS_UNTIL_FLAT {94					let amount: BalanceOf<T> = Perbill::from_rational(95						block_interval * (START_INFLATION_PERCENT * TOTAL_YEARS_UNTIL_FLAT - current_year * (START_INFLATION_PERCENT - END_INFLATION_PERCENT)),96						YEAR * TOTAL_YEARS_UNTIL_FLAT97					) * ( one_percent * T::Currency::total_issuance() );98					<BlockInflation<T>>::put(amount);99				}100				else {101					let amount: BalanceOf<T> = Perbill::from_rational(102						block_interval * END_INFLATION_PERCENT,103						YEAR104					) * (one_percent * T::Currency::total_issuance());105					<BlockInflation<T>>::put(amount);106				}107				<StartingYearTotalIssuance<T>>::set(T::Currency::total_issuance());108109				// First time deposit110				T::Currency::deposit_creating(&T::TreasuryAccountId::get(), <BlockInflation<T>>::get());111112				add_weight(7, 6, 28_300_000);113			}114115			// Apply inflation every InflationBlockInterval blocks and in the 1st block to initialize Treasury account116			else if (now % T::BlockNumber::from(block_interval)).is_zero() {117				T::Currency::deposit_into_existing(&T::TreasuryAccountId::get(), <BlockInflation<T>>::get()).ok();118119				add_weight(3, 2, 12_900_000);120			}121122			consumed_weight123		}124125	}126}