git.delta.rocks / unique-network / refs/commits / 5509757640ce

1// Copyright 2019-2022 Unique Network (Gibraltar) Ltd.2// This file is part of Unique Network.34// Unique Network is free software: you can redistribute it and/or modify5// it under the terms of the GNU General Public License as published by6// the Free Software Foundation, either version 3 of the License, or7// (at your option) any later version.89// Unique Network is distributed in the hope that it will be useful,10// but WITHOUT ANY WARRANTY; without even the implied warranty of11// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the12// GNU General Public License for more details.1314// You should have received a copy of the GNU General Public License15// along with Unique Network. If not, see <http://www.gnu.org/licenses/>.1617//! # App Promotion pallet18//!19//! The pallet implements the mechanics of staking and sponsoring collections/contracts.20//!21//! - [`Config`]22//! - [`Pallet`]23//! - [`Error`]24//! - [`Event`]25//!26//! ## Overview27//! The App Promotion pallet allows fund holders to stake at a certain daily rate of return.28//! The mechanics implemented in the pallet allow it to act as a sponsor for collections / contracts,29//! the list of which is set by the pallet administrator.30//!31//!32//! ## Interface33//!	The pallet provides interfaces for funds, collection/contract operations (see [types] module).3435//!36//! ### Dispatchable Functions37//!	- [`set_admin_address`][`Pallet::set_admin_address`] - sets an address as the the admin.38//! - [`stake`][`Pallet::stake`] - stakes the amount of native tokens.39//! - [`unstake`][`Pallet::unstake`] - unstakes all stakes.40//! - [`sponsor_collection`][`Pallet::sponsor_collection`] - sets the pallet to be the sponsor for the collection.41//! - [`stop_sponsoring_collection`][`Pallet::stop_sponsoring_collection`] - removes the pallet as the sponsor for the collection.42//! - [`sponsor_contract`][`Pallet::sponsor_contract`] - sets the pallet to be the sponsor for the contract.43//! - [`stop_sponsoring_contract`][`Pallet::stop_sponsoring_contract`] - removes the pallet as the sponsor for the contract.44//! - [`payout_stakers`][`Pallet::payout_stakers`] - recalculates interest for the specified number of stakers.45//!4647// #![recursion_limit = "1024"]48#![cfg_attr(not(feature = "std"), no_std)]4950#[cfg(feature = "runtime-benchmarks")]51mod benchmarking;5253pub mod types;54pub mod weights;5556use sp_std::{57	vec::{Vec},58	vec,59	iter::Sum,60	borrow::ToOwned,61	cell::RefCell,62};63use sp_core::H160;64use codec::EncodeLike;65use pallet_balances::BalanceLock;66pub use types::*;6768use up_data_structs::CollectionId;6970use frame_support::{71	dispatch::{DispatchResult},72	traits::{73		Currency, Get, LockableCurrency, WithdrawReasons, tokens::Balance, ExistenceRequirement,74	},75	ensure,76};7778use weights::WeightInfo;7980pub use pallet::*;81use pallet_evm::account::CrossAccountId;82use sp_runtime::{83	Perbill,84	traits::{BlockNumberProvider, CheckedAdd, CheckedSub, AccountIdConversion, Zero},85	ArithmeticError,86};8788pub const LOCK_IDENTIFIER: [u8; 8] = *b"appstake";8990const PENDING_LIMIT_PER_BLOCK: u32 = 3;9192type BalanceOf<T> =93	<<T as Config>::Currency as Currency<<T as frame_system::Config>::AccountId>>::Balance;9495#[frame_support::pallet]96pub mod pallet {97	use super::*;98	use frame_support::{99		Blake2_128Concat, Twox64Concat, pallet_prelude::*, storage::Key, PalletId,100		traits::ReservableCurrency,101	};102	use frame_system::pallet_prelude::*;103104	#[pallet::config]105	pub trait Config:106		frame_system::Config + pallet_evm::Config + pallet_configuration::Config107	{108		/// Type to interact with the native token109		type Currency: ExtendedLockableCurrency<Self::AccountId>110			+ ReservableCurrency<Self::AccountId>;111112		/// Type for interacting with collections113		type CollectionHandler: CollectionHandler<114			AccountId = Self::AccountId,115			CollectionId = CollectionId,116		>;117118		/// Type for interacting with conrtacts119		type ContractHandler: ContractHandler<AccountId = Self::CrossAccountId, ContractId = H160>;120121		/// `AccountId` for treasury122		type TreasuryAccountId: Get<Self::AccountId>;123124		/// The app's pallet id, used for deriving its sovereign account address.125		#[pallet::constant]126		type PalletId: Get<PalletId>;127128		/// In relay blocks.129		#[pallet::constant]130		type RecalculationInterval: Get<Self::BlockNumber>;131132		/// In parachain blocks.133		#[pallet::constant]134		type PendingInterval: Get<Self::BlockNumber>;135136		/// Rate of return for interval in blocks defined in `RecalculationInterval`.137		#[pallet::constant]138		type IntervalIncome: Get<Perbill>;139140		/// Decimals for the `Currency`.141		#[pallet::constant]142		type Nominal: Get<BalanceOf<Self>>;143144		/// Weight information for extrinsics in this pallet.145		type WeightInfo: WeightInfo;146147		// The relay block number provider148		type RelayBlockNumberProvider: BlockNumberProvider<BlockNumber = Self::BlockNumber>;149150		/// Events compatible with [`frame_system::Config::Event`].151		type RuntimeEvent: IsType<<Self as frame_system::Config>::RuntimeEvent> + From<Event<Self>>;152	}153154	#[pallet::pallet]155	#[pallet::generate_store(pub(super) trait Store)]156	pub struct Pallet<T>(_);157158	#[pallet::event]159	#[pallet::generate_deposit(fn deposit_event)]160	pub enum Event<T: Config> {161		/// Staking recalculation was performed162		///163		/// # Arguments164		/// * AccountId: account of the staker.165		/// * Balance : recalculation base166		/// * Balance : total income167		StakingRecalculation(168			/// An recalculated staker169			T::AccountId,170			/// Base on which interest is calculated171			BalanceOf<T>,172			/// Amount of accrued interest173			BalanceOf<T>,174		),175176		/// Staking was performed177		///178		/// # Arguments179		/// * AccountId: account of the staker180		/// * Balance : staking amount181		Stake(T::AccountId, BalanceOf<T>),182183		/// Unstaking was performed184		///185		/// # Arguments186		/// * AccountId: account of the staker187		/// * Balance : unstaking amount188		Unstake(T::AccountId, BalanceOf<T>),189190		/// The admin was set191		///192		/// # Arguments193		/// * AccountId: account address of the admin194		SetAdmin(T::AccountId),195	}196197	#[pallet::error]198	pub enum Error<T> {199		/// Error due to action requiring admin to be set.200		AdminNotSet,201		/// No permission to perform an action.202		NoPermission,203		/// Insufficient funds to perform an action.204		NotSufficientFunds,205		/// Occurs when a pending unstake cannot be added in this block. PENDING_LIMIT_PER_BLOCK` limits exceeded.206		PendingForBlockOverflow,207		/// The error is due to the fact that the collection/contract must already be sponsored in order to perform the action.208		SponsorNotSet,209		/// Errors caused by incorrect actions with a locked balance.210		IncorrectLockedBalanceOperation,211	}212213	/// Stores the total staked amount.214	#[pallet::storage]215	pub type TotalStaked<T: Config> = StorageValue<Value = BalanceOf<T>, QueryKind = ValueQuery>;216217	/// Stores the `admin` account. Some extrinsics can only be executed if they were signed by `admin`.218	#[pallet::storage]219	pub type Admin<T: Config> = StorageValue<Value = T::AccountId, QueryKind = OptionQuery>;220221	/// Stores the amount of tokens staked by account in the blocknumber.222	///223	/// * **Key1** - Staker account.224	/// * **Key2** - Relay block number when the stake was made.225	/// * **(Balance, BlockNumber)** - Balance of the stake.226	/// The number of the relay block in which we must perform the interest recalculation227	#[pallet::storage]228	pub type Staked<T: Config> = StorageNMap<229		Key = (230			Key<Blake2_128Concat, T::AccountId>,231			Key<Twox64Concat, T::BlockNumber>,232		),233		Value = (BalanceOf<T>, T::BlockNumber),234		QueryKind = ValueQuery,235	>;236237	/// Stores amount of stakes for an `Account`.238	///239	/// * **Key** - Staker account.240	/// * **Value** - Amount of stakes.241	#[pallet::storage]242	pub type StakesPerAccount<T: Config> =243		StorageMap<_, Blake2_128Concat, T::AccountId, u8, ValueQuery>;244245	/// Stores amount of stakes for an `Account`.246	///247	/// * **Key** - Staker account.248	/// * **Value** - Amount of stakes.249	#[pallet::storage]250	pub type PendingUnstake<T: Config> = StorageMap<251		_,252		Twox64Concat,253		T::BlockNumber,254		BoundedVec<(T::AccountId, BalanceOf<T>), ConstU32<PENDING_LIMIT_PER_BLOCK>>,255		ValueQuery,256	>;257258	/// Stores a key for record for which the revenue recalculation was performed.259	/// If `None`, then recalculation has not yet been performed or calculations have been completed for all stakers.260	#[pallet::storage]261	#[pallet::getter(fn get_next_calculated_record)]262	pub type PreviousCalculatedRecord<T: Config> =263		StorageValue<Value = (T::AccountId, T::BlockNumber), QueryKind = OptionQuery>;264265	#[pallet::hooks]266	impl<T: Config> Hooks<BlockNumberFor<T>> for Pallet<T> {267		/// Block overflow is impossible due to the fact that the unstake algorithm in on_initialize268		/// implies the execution of a strictly limited number of relatively lightweight operations.269		/// A separate benchmark has been implemented to scale the weight depending on the number of pendings.270		fn on_initialize(current_block_number: T::BlockNumber) -> Weight271		where272			<T as frame_system::Config>::BlockNumber: From<u32>,273		{274			let block_pending = PendingUnstake::<T>::take(current_block_number);275			let counter = block_pending.len() as u32;276277			if !block_pending.is_empty() {278				block_pending.into_iter().for_each(|(staker, amount)| {279					<<T as Config>::Currency as ReservableCurrency<T::AccountId>>::unreserve(280						&staker, amount,281					);282				});283			}284285			<T as Config>::WeightInfo::on_initialize(counter)286		}287	}288289	#[pallet::call]290	impl<T: Config> Pallet<T>291	where292		T::BlockNumber: From<u32> + Into<u32>,293		<<T as Config>::Currency as Currency<T::AccountId>>::Balance: Sum + From<u128>,294	{295		/// Sets an address as the the admin.296		///297		/// # Permissions298		///299		/// * Sudo300		///301		/// # Arguments302		///303		/// * `admin`: account of the new admin.304		#[pallet::call_index(0)]305		#[pallet::weight(<T as Config>::WeightInfo::set_admin_address())]306		pub fn set_admin_address(origin: OriginFor<T>, admin: T::CrossAccountId) -> DispatchResult {307			ensure_root(origin)?;308309			<Admin<T>>::set(Some(admin.as_sub().to_owned()));310311			Self::deposit_event(Event::SetAdmin(admin.as_sub().to_owned()));312313			Ok(())314		}315316		/// Stakes the amount of native tokens.317		/// Sets `amount` to the locked state.318		/// The maximum number of stakes for a staker is 10.319		///320		/// # Arguments321		///322		/// * `amount`: in native tokens.323		#[pallet::call_index(1)]324		#[pallet::weight(<T as Config>::WeightInfo::stake())]325		pub fn stake(staker: OriginFor<T>, amount: BalanceOf<T>) -> DispatchResult {326			let staker_id = ensure_signed(staker)?;327328			ensure!(329				StakesPerAccount::<T>::get(&staker_id) < 10,330				Error::<T>::NoPermission331			);332333			ensure!(334				amount >= <BalanceOf<T>>::from(100u128) * T::Nominal::get(),335				ArithmeticError::Underflow336			);337			let config = <PalletConfiguration<T>>::get();338339			let balance =340				<<T as Config>::Currency as Currency<T::AccountId>>::free_balance(&staker_id);341342			// checks that we can lock `amount` on the `staker` account.343			<<T as Config>::Currency as Currency<T::AccountId>>::ensure_can_withdraw(344				&staker_id,345				amount,346				WithdrawReasons::all(),347				balance348					.checked_sub(&amount)349					.ok_or(ArithmeticError::Underflow)?,350			)?;351352			Self::add_lock_balance(&staker_id, amount)?;353354			let block_number = T::RelayBlockNumberProvider::current_block_number();355356			// Calculation of the number of recalculation periods,357			// after how much the first interest calculation should be performed for the stake358			let recalculate_after_interval: T::BlockNumber =359				if block_number % config.recalculation_interval == 0u32.into() {360					1u32.into()361				} else {362					2u32.into()363				};364365			// Сalculation of the number of the relay block366			// in which it is necessary to accrue remuneration for the stake.367			let recalc_block = (block_number / config.recalculation_interval368				+ recalculate_after_interval)369				* config.recalculation_interval;370371			<Staked<T>>::insert((&staker_id, block_number), {372				let mut balance_and_recalc_block = <Staked<T>>::get((&staker_id, block_number));373				balance_and_recalc_block.0 = balance_and_recalc_block374					.0375					.checked_add(&amount)376					.ok_or(ArithmeticError::Overflow)?;377				balance_and_recalc_block.1 = recalc_block;378				balance_and_recalc_block379			});380381			<TotalStaked<T>>::set(382				<TotalStaked<T>>::get()383					.checked_add(&amount)384					.ok_or(ArithmeticError::Overflow)?,385			);386387			StakesPerAccount::<T>::mutate(&staker_id, |stakes| *stakes += 1);388389			Self::deposit_event(Event::Stake(staker_id, amount));390391			Ok(())392		}393394		/// Unstakes all stakes.395		/// Moves the sum of all stakes to the `reserved` state.396		/// After the end of `PendingInterval` this sum becomes completely397		/// free for further use.398		#[pallet::call_index(2)]399		#[pallet::weight(<T as Config>::WeightInfo::unstake())]400		pub fn unstake(staker: OriginFor<T>) -> DispatchResultWithPostInfo {401			let staker_id = ensure_signed(staker)?;402			let config = <PalletConfiguration<T>>::get();403404			// calculate block number where the sum would be free405			let block = <frame_system::Pallet<T>>::block_number() + config.pending_interval;406407			let mut pendings = <PendingUnstake<T>>::get(block);408409			// checks that we can do unreserve stakes in the block410			ensure!(!pendings.is_full(), Error::<T>::PendingForBlockOverflow);411412			let mut total_stakes = 0u64;413414			let total_staked: BalanceOf<T> = Staked::<T>::drain_prefix((&staker_id,))415				.map(|(_, (amount, _))| {416					total_stakes += 1;417					amount418				})419				.sum();420421			if total_staked.is_zero() {422				return Ok(None::<Weight>.into()); // TO-DO423			}424425			pendings426				.try_push((staker_id.clone(), total_staked))427				.map_err(|_| Error::<T>::PendingForBlockOverflow)?;428429			<PendingUnstake<T>>::insert(block, pendings);430431			Self::unlock_balance(&staker_id, total_staked)?;432433			<<T as Config>::Currency as ReservableCurrency<T::AccountId>>::reserve(434				&staker_id,435				total_staked,436			)?;437438			TotalStaked::<T>::set(439				TotalStaked::<T>::get()440					.checked_sub(&total_staked)441					.ok_or(ArithmeticError::Underflow)?,442			);443444			StakesPerAccount::<T>::remove(&staker_id);445446			Self::deposit_event(Event::Unstake(staker_id, total_staked));447448			Ok(None::<Weight>.into())449		}450451		/// Sets the pallet to be the sponsor for the collection.452		///453		/// # Permissions454		///455		/// * Pallet admin456		///457		/// # Arguments458		///459		/// * `collection_id`: ID of the collection that will be sponsored by `pallet_id`460		#[pallet::call_index(3)]461		#[pallet::weight(<T as Config>::WeightInfo::sponsor_collection())]462		pub fn sponsor_collection(463			admin: OriginFor<T>,464			collection_id: CollectionId,465		) -> DispatchResult {466			let admin_id = ensure_signed(admin)?;467			ensure!(468				admin_id == Admin::<T>::get().ok_or(Error::<T>::AdminNotSet)?,469				Error::<T>::NoPermission470			);471472			T::CollectionHandler::set_sponsor(Self::account_id(), collection_id)473		}474475		/// Removes the pallet as the sponsor for the collection.476		/// Returns [`NoPermission`][`Error::NoPermission`]477		/// if the pallet wasn't the sponsor.478		///479		/// # Permissions480		///481		/// * Pallet admin482		///483		/// # Arguments484		///485		/// * `collection_id`: ID of the collection that is sponsored by `pallet_id`486		#[pallet::call_index(4)]487		#[pallet::weight(<T as Config>::WeightInfo::stop_sponsoring_collection())]488		pub fn stop_sponsoring_collection(489			admin: OriginFor<T>,490			collection_id: CollectionId,491		) -> DispatchResult {492			let admin_id = ensure_signed(admin)?;493494			ensure!(495				admin_id == Admin::<T>::get().ok_or(Error::<T>::AdminNotSet)?,496				Error::<T>::NoPermission497			);498499			ensure!(500				T::CollectionHandler::sponsor(collection_id)?.ok_or(<Error<T>>::SponsorNotSet)?501					== Self::account_id(),502				<Error<T>>::NoPermission503			);504			T::CollectionHandler::remove_collection_sponsor(collection_id)505		}506507		/// Sets the pallet to be the sponsor for the contract.508		///509		/// # Permissions510		///511		/// * Pallet admin512		///513		/// # Arguments514		///515		/// * `contract_id`: the contract address that will be sponsored by `pallet_id`516		#[pallet::call_index(5)]517		#[pallet::weight(<T as Config>::WeightInfo::sponsor_contract())]518		pub fn sponsor_contract(admin: OriginFor<T>, contract_id: H160) -> DispatchResult {519			let admin_id = ensure_signed(admin)?;520521			ensure!(522				admin_id == Admin::<T>::get().ok_or(Error::<T>::AdminNotSet)?,523				Error::<T>::NoPermission524			);525526			T::ContractHandler::set_sponsor(527				T::CrossAccountId::from_sub(Self::account_id()),528				contract_id,529			)530		}531532		/// Removes the pallet as the sponsor for the contract.533		/// Returns [`NoPermission`][`Error::NoPermission`]534		/// if the pallet wasn't the sponsor.535		///536		/// # Permissions537		///538		/// * Pallet admin539		///540		/// # Arguments541		///542		/// * `contract_id`: the contract address that is sponsored by `pallet_id`543		#[pallet::call_index(6)]544		#[pallet::weight(<T as Config>::WeightInfo::stop_sponsoring_contract())]545		pub fn stop_sponsoring_contract(admin: OriginFor<T>, contract_id: H160) -> DispatchResult {546			let admin_id = ensure_signed(admin)?;547548			ensure!(549				admin_id == Admin::<T>::get().ok_or(Error::<T>::AdminNotSet)?,550				Error::<T>::NoPermission551			);552553			ensure!(554				T::ContractHandler::sponsor(contract_id)?555					.ok_or(<Error<T>>::SponsorNotSet)?556					.as_sub() == &Self::account_id(),557				<Error<T>>::NoPermission558			);559			T::ContractHandler::remove_contract_sponsor(contract_id)560		}561562		/// Recalculates interest for the specified number of stakers.563		/// If all stakers are not recalculated, the next call of the extrinsic564		/// will continue the recalculation, from those stakers for whom this565		/// was not perform in last call.566		///567		/// # Permissions568		///569		/// * Pallet admin570		///571		/// # Arguments572		///573		/// * `stakers_number`: the number of stakers for which recalculation will be performed574		#[pallet::call_index(7)]575		#[pallet::weight(<T as Config>::WeightInfo::payout_stakers(stakers_number.unwrap_or(DEFAULT_NUMBER_PAYOUTS) as u32))]576		pub fn payout_stakers(admin: OriginFor<T>, stakers_number: Option<u8>) -> DispatchResult {577			let admin_id = ensure_signed(admin)?;578579			ensure!(580				admin_id == Admin::<T>::get().ok_or(Error::<T>::AdminNotSet)?,581				Error::<T>::NoPermission582			);583			let config = <PalletConfiguration<T>>::get();584585			let mut stakers_number = stakers_number.unwrap_or(DEFAULT_NUMBER_PAYOUTS);586587			ensure!(588				stakers_number <= config.max_stakers_per_calculation && stakers_number != 0,589				Error::<T>::NoPermission590			);591592			// calculate the number of the current recalculation block,593			// this is necessary in order to understand which stakers we should calculate interest594			let current_recalc_block = Self::get_current_recalc_block(595				T::RelayBlockNumberProvider::current_block_number(),596				&config,597			);598599			// calculate the number of the next recalculation block,600			// this value is set for the stakers to whom the recalculation will be performed601			let next_recalc_block = current_recalc_block + config.recalculation_interval;602603			let mut storage_iterator = Self::get_next_calculated_key()604				.map_or(Staked::<T>::iter(), |key| Staked::<T>::iter_from(key));605606			PreviousCalculatedRecord::<T>::set(None);607608			{609				// Address handled in the last payout loop iteration (below)610				let last_id = RefCell::new(None);611				// Block number (as a part of the key) for which calculation was performed in the last payout loop iteration612				let mut last_staked_calculated_block = Default::default();613				// Reward balance for the address in the iteration614				let income_acc = RefCell::new(BalanceOf::<T>::default());615				// Staked balance for the address in the iteration (before stake is recalculated)616				let amount_acc = RefCell::new(BalanceOf::<T>::default());617618				// This closure is used to finalize handling single staker address in each of the two conditions: (1) when we break out of the payout619				// loop because we reached the number of stakes for rewarding, (2) When all stakes by the single address are handled and the payout620				// loop switches to handling the next staker address:621				//   1. Transfer full reward amount to the payee622				//   2. Lock the reward in staking lock623				//   3. Update TotalStaked amount624				//   4. Issue StakingRecalculation event625				let flush_stake = || -> DispatchResult {626					if let Some(last_id) = &*last_id.borrow() {627						if !income_acc.borrow().is_zero() {628							<<T as Config>::Currency as Currency<T::AccountId>>::transfer(629								&T::TreasuryAccountId::get(),630								last_id,631								*income_acc.borrow(),632								ExistenceRequirement::KeepAlive,633							)?;634635							Self::add_lock_balance(last_id, *income_acc.borrow())?;636							<TotalStaked<T>>::try_mutate(|staked| -> DispatchResult {637								*staked = staked638									.checked_add(&*income_acc.borrow())639									.ok_or(ArithmeticError::Overflow)?;640								Ok(())641							})?;642643							Self::deposit_event(Event::StakingRecalculation(644								last_id.clone(),645								*amount_acc.borrow(),646								*income_acc.borrow(),647							));648						}649650						*income_acc.borrow_mut() = BalanceOf::<T>::default();651						*amount_acc.borrow_mut() = BalanceOf::<T>::default();652					}653					Ok(())654				};655656				// Reward payment loop. Should loop for no more than config.max_stakers_per_calculation657				// iterations in one extrinsic call658				//659				// stakers_number - keeps the remaining number of iterations (staker addresses to handle)660				// next_recalc_block_for_stake - is taken from the state and stores the starting relay block from which reward should be paid out661				// income_acc - stores the reward amount to pay to the staker address (accumulates over all address stake records)662				while let Some((663					(current_id, staked_block),664					(amount, next_recalc_block_for_stake),665				)) = storage_iterator.next()666				{667					// last_id is not equal current_id when we switch to handling a new staker address668					// or just start handling the very first address. In the latter case last_id will be None and669					// flush_stake will do nothing670					if last_id.borrow().as_ref() != Some(&current_id) {671						if stakers_number > 0 {672							flush_stake()?;673							*last_id.borrow_mut() = Some(current_id.clone());674							stakers_number -= 1;675						}676						// Break out if we reached the address limit677						else {678							if let Some(staker) = &*last_id.borrow() {679								// Save the last calculated record to pick up in the next extrinsic call680								PreviousCalculatedRecord::<T>::set(Some((681									staker.clone(),682									last_staked_calculated_block,683								)));684							}685							break;686						};687					};688689					// Increase accumulated reward for current address and update current staking record, i.e. (address, staked_block) -> amount690					if current_recalc_block >= next_recalc_block_for_stake {691						*amount_acc.borrow_mut() += amount;692						Self::recalculate_and_insert_stake(693							&current_id,694							staked_block,695							next_recalc_block,696							amount,697							((current_recalc_block - next_recalc_block_for_stake)698								/ config.recalculation_interval)699								.into() + 1,700							&mut *income_acc.borrow_mut(),701						);702					}703					last_staked_calculated_block = staked_block;704				}705				flush_stake()?;706			}707708			Ok(())709		}710	}711}712713impl<T: Config> Pallet<T> {714	/// The account address of the app promotion pot.715	///716	/// This actually does computation. If you need to keep using it, then make sure you cache the717	/// value and only call this once.718	pub fn account_id() -> T::AccountId {719		T::PalletId::get().into_account_truncating()720	}721722	/// Unlocks the balance that was locked by the pallet.723	///724	/// - `staker`: staker account.725	/// - `amount`: amount of unlocked funds.726	fn unlock_balance(staker: &T::AccountId, amount: BalanceOf<T>) -> DispatchResult {727		let locked_balance = Self::get_locked_balance(staker)728			.map(|l| l.amount)729			.ok_or(<Error<T>>::IncorrectLockedBalanceOperation)?;730731		// It is understood that we cannot unlock more funds than were locked by staking.732		// Therefore, if implemented correctly, this error should not occur.733		Self::set_lock_unchecked(734			staker,735			locked_balance736				.checked_sub(&amount)737				.ok_or(ArithmeticError::Underflow)?,738		);739		Ok(())740	}741742	/// Adds the balance to locked by the pallet.743	///744	/// - `staker`: staker account.745	/// - `amount`: amount of added locked funds.746	fn add_lock_balance(staker: &T::AccountId, amount: BalanceOf<T>) -> DispatchResult {747		Self::get_locked_balance(staker)748			.map_or(<BalanceOf<T>>::default(), |l| l.amount)749			.checked_add(&amount)750			.map(|new_lock| Self::set_lock_unchecked(staker, new_lock))751			.ok_or(ArithmeticError::Overflow.into())752	}753754	/// Sets the new state of a balance locked by the pallet.755	///756	/// - `staker`: staker account.757	/// - `amount`: amount of locked funds.758	fn set_lock_unchecked(staker: &T::AccountId, amount: BalanceOf<T>) {759		if amount.is_zero() {760			<<T as Config>::Currency as LockableCurrency<T::AccountId>>::remove_lock(761				LOCK_IDENTIFIER,762				&staker,763			);764		} else {765			<<T as Config>::Currency as LockableCurrency<T::AccountId>>::set_lock(766				LOCK_IDENTIFIER,767				staker,768				amount,769				WithdrawReasons::all(),770			)771		}772	}773774	/// Returns the balance locked by the pallet for the staker.775	///776	/// - `staker`: staker account.777	pub fn get_locked_balance(778		staker: impl EncodeLike<T::AccountId>,779	) -> Option<BalanceLock<BalanceOf<T>>> {780		<<T as Config>::Currency as ExtendedLockableCurrency<T::AccountId>>::locks(staker)781			.into_iter()782			.find(|l| l.id == LOCK_IDENTIFIER)783	}784785	/// Returns the total staked balance for the staker.786	///787	/// - `staker`: staker account.788	pub fn total_staked_by_id(staker: impl EncodeLike<T::AccountId>) -> Option<BalanceOf<T>> {789		let staked = Staked::<T>::iter_prefix((staker,))790			.into_iter()791			.fold(<BalanceOf<T>>::default(), |acc, (_, (amount, _))| {792				acc + amount793			});794		if staked != <BalanceOf<T>>::default() {795			Some(staked)796		} else {797			None798		}799	}800801	/// Returns all relay block numbers when stake was made,802	/// the amount of the stake.803	///804	/// - `staker`: staker account.805	pub fn total_staked_by_id_per_block(806		staker: impl EncodeLike<T::AccountId>,807	) -> Option<Vec<(T::BlockNumber, BalanceOf<T>)>> {808		let mut staked = Staked::<T>::iter_prefix((staker,))809			.into_iter()810			.map(|(block, (amount, _))| (block, amount))811			.collect::<Vec<_>>();812		staked.sort_by_key(|(block, _)| *block);813		if !staked.is_empty() {814			Some(staked)815		} else {816			None817		}818	}819820	/// Returns the total staked balance for the staker.821	/// If `staker` is `None`, returns the total amount staked.822	/// - `staker`: staker account.823	pub fn cross_id_total_staked(staker: Option<T::CrossAccountId>) -> Option<BalanceOf<T>> {824		staker.map_or(Some(<TotalStaked<T>>::get()), |s| {825			Self::total_staked_by_id(s.as_sub())826		})827	}828829	// pub fn cross_id_locked_balance(staker: T::CrossAccountId) -> BalanceOf<T> {830	// 	Self::get_locked_balance(staker.as_sub())831	// 		.map(|l| l.amount)832	// 		.unwrap_or_default()833	// }834835	/// Returns all relay block numbers when stake was made,836	/// the amount of the stake.837	///838	/// - `staker`: staker account.839	pub fn cross_id_total_staked_per_block(840		staker: T::CrossAccountId,841	) -> Vec<(T::BlockNumber, BalanceOf<T>)> {842		Self::total_staked_by_id_per_block(staker.as_sub()).unwrap_or_default()843	}844845	fn recalculate_and_insert_stake(846		staker: &T::AccountId,847		staked_block: T::BlockNumber,848		next_recalc_block: T::BlockNumber,849		base: BalanceOf<T>,850		iters: u32,851		income_acc: &mut BalanceOf<T>,852	) {853		let income = Self::calculate_income(base, iters);854855		base.checked_add(&income).map(|res| {856			<Staked<T>>::insert((staker, staked_block), (res, next_recalc_block));857			*income_acc += income;858		});859	}860861	fn calculate_income<I>(base: I, iters: u32) -> I862	where863		I: EncodeLike<BalanceOf<T>> + Balance,864	{865		let config = <PalletConfiguration<T>>::get();866		let mut income = base;867868		(0..iters).for_each(|_| income += config.interval_income * income);869870		income - base871	}872873	/// Get relay block number rounded down to multiples of config.recalculation_interval.874	/// We need it to reward stakers in integer parts of recalculation_interval875	fn get_current_recalc_block(876		current_relay_block: T::BlockNumber,877		config: &PalletConfiguration<T>,878	) -> T::BlockNumber {879		(current_relay_block / config.recalculation_interval) * config.recalculation_interval880	}881882	fn get_next_calculated_key() -> Option<Vec<u8>> {883		Self::get_next_calculated_record().map(|key| Staked::<T>::hashed_key_for(key))884	}885}886887impl<T: Config> Pallet<T>888where889	<<T as Config>::Currency as Currency<T::AccountId>>::Balance: Sum,890{891	/// Returns the amount reserved by the pending.892	/// If `staker` is `None`, returns the total pending.893	///894	/// -`staker`: staker account.895	///896	/// Since user funds are not transferred anywhere by staking, overflow protection is provided897	/// at the level of the associated type `Balance` of `Currency` trait. In order to overflow,898	/// the staker must have more funds on his account than the maximum set for `Balance` type.899	pub fn cross_id_pending_unstake(staker: Option<T::CrossAccountId>) -> BalanceOf<T> {900		staker.map_or(901			PendingUnstake::<T>::iter_values()902				.flat_map(|pendings| pendings.into_iter().map(|(_, amount)| amount))903				.sum(),904			|s| {905				PendingUnstake::<T>::iter_values()906					.flatten()907					.filter_map(|(id, amount)| {908						if id == *s.as_sub() {909							Some(amount)910						} else {911							None912						}913					})914					.sum()915			},916		)917	}918919	/// Returns all parachain block numbers when unreserve is expected,920	/// the amount of the unreserved funds.921	///922	/// - `staker`: staker account.923	pub fn cross_id_pending_unstake_per_block(924		staker: T::CrossAccountId,925	) -> Vec<(T::BlockNumber, BalanceOf<T>)> {926		let mut unsorted_res = vec![];927		PendingUnstake::<T>::iter().for_each(|(block, pendings)| {928			pendings.into_iter().for_each(|(id, amount)| {929				if id == *staker.as_sub() {930					unsorted_res.push((block, amount));931				};932			})933		});934935		unsorted_res.sort_by_key(|(block, _)| *block);936		unsorted_res937	}938}