Grcov report - pools.rs

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// Copyright (C) Moondance Labs Ltd.

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// This file is part of Tanssi.

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// Tanssi is free software: you can redistribute it and/or modify

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// it under the terms of the GNU General Public License as published by

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// the Free Software Foundation, either version 3 of the License, or

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// (at your option) any later version.

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// Tanssi is distributed in the hope that it will be useful,

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// but WITHOUT ANY WARRANTY; without even the implied warranty of

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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

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// GNU General Public License for more details.

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// You should have received a copy of the GNU General Public License

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// along with Tanssi.  If not, see <http://www.gnu.org/licenses/>

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use {

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    crate::{

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        candidate::Candidates, weights::WeightInfo, Candidate, CandidateSummaries, Config,

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        CreditOf, Delegator, DelegatorCandidateSummaries, Error, Event, Pallet, Pools, PoolsKey,

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        Shares, Stake,

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},

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    core::marker::PhantomData,

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    frame_support::{

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        ensure,

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        pallet_prelude::*,

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        traits::{fungible::Balanced, Imbalance},

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},

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    serde::{Deserialize, Serialize},

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    sp_core::Get,

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    sp_runtime::traits::{CheckedAdd, CheckedDiv, Zero},

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    tp_maths::{ErrAdd, ErrMul, ErrSub, MulDiv},

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};

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#[allow(dead_code)]

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pub trait Pool<T: Config> {

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    /// Get the amount of shares a delegator have for given candidate.

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    fn shares(candidate: &Candidate<T>, delegator: &Delegator<T>) -> Shares<T::Balance>;

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    /// Get the total amount of shares all delegators have for given candidate.

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    fn shares_supply(candidate: &Candidate<T>) -> Shares<T::Balance>;

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    /// Get the total amount of currency staked for given candidate / the value of all shares.

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    fn total_staked(candidate: &Candidate<T>) -> Stake<T::Balance>;

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    /// Get the amount of currency held for that pool in the delegator account.

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    fn hold(candidate: &Candidate<T>, delegator: &Delegator<T>) -> Stake<T::Balance>;

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    /// Set the amount of shares a delegator have for given candidate.

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    fn set_shares(candidate: &Candidate<T>, delegator: &Delegator<T>, value: Shares<T::Balance>);

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    /// Set the total amount of shares all delegators have for given candidate.

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    fn set_shares_supply(candidate: &Candidate<T>, value: Shares<T::Balance>);

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    /// Set the total amount of currency staked for given candidate / the value of all shares.

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    fn set_total_staked(candidate: &Candidate<T>, value: Stake<T::Balance>);

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    /// Set the amount of currency held for that pool in the delegator account.

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    fn set_hold(candidate: &Candidate<T>, delegator: &Delegator<T>, value: Stake<T::Balance>);

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    /// Get the initial value of a share in case none exist yet.

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    fn initial_share_value() -> Stake<T::Balance>;

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    /// Pool variant in PoolKind

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    fn pool_kind() -> PoolKind;

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    /// Convert an amount of shares to an amount of staked currency for given candidate.

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    /// Returns an error if there are no shares for that candidate.

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1108

    fn shares_to_stake(

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1108

        candidate: &Candidate<T>,

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1108

        shares: Shares<T::Balance>,

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1108

    ) -> Result<Stake<T::Balance>, Error<T>> {

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1108

        let total_staked = Self::total_staked(candidate).0;

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1108

        let supply = Self::shares_supply(candidate).0;

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1108

        ensure!(!supply.is_zero(), Error::NoOneIsStaking);

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1107

        Ok(Stake(shares.0.mul_div(total_staked, supply)?))

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1108

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    /// Convert an amount of shares to an amount of staked currency for given candidate.

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    /// If this candidate have no shares then it uses `initial_share_value` to compute the value.

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497

    fn shares_to_stake_or_init(

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        candidate: &Candidate<T>,

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497

        shares: Shares<T::Balance>,

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497

    ) -> Result<Stake<T::Balance>, Error<T>> {

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497

        if Self::total_staked(candidate).0.is_zero() {

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418

            Ok(Stake(shares.0.err_mul(&Self::initial_share_value().0)?))

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        } else {

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            Self::shares_to_stake(candidate, shares)

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497

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    /// Convert an amount of staked currency to an amount of shares for given candidate.

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    /// Returns an error if there are no shares for that candidate.

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146

    fn stake_to_shares(

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        candidate: &Candidate<T>,

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        stake: Stake<T::Balance>,

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146

    ) -> Result<Shares<T::Balance>, Error<T>> {

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        let total_staked = Self::total_staked(candidate).0;

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        let supply = Self::shares_supply(candidate).0;

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        ensure!(!supply.is_zero(), Error::NoOneIsStaking);

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        Ok(Shares(stake.0.mul_div(supply, total_staked)?))

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146

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491

    fn computed_stake(

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        candidate: &Candidate<T>,

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        delegator: &Delegator<T>,

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491

    ) -> Result<Stake<T::Balance>, Error<T>> {

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        let shares = Self::shares(candidate, delegator);

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491

        if shares.0.is_zero() {

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223

            return Ok(Stake(Zero::zero()));

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        Self::shares_to_stake(candidate, shares)

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491

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    /// Convert an amount of staked currency to an amount of shares for given candidate.

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    /// If this candidate have no shares then it uses `initial_share_value` to compute the value.

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476

    fn stake_to_shares_or_init(

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        candidate: &Candidate<T>,

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        stake: Stake<T::Balance>,

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476

    ) -> Result<Shares<T::Balance>, Error<T>> {

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476

        if Self::total_staked(candidate).0.is_zero() {

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            Ok(Shares(

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                stake

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.0

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                    .checked_div(&Self::initial_share_value().0)

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                    .ok_or(Error::<T>::InvalidPalletSetting)?,

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))

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        } else {

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            Self::stake_to_shares(candidate, stake)

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476

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    /// Increase the total stake of a pool without creating new shares, which basically increase

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    /// the value of each share.

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    fn share_stake_among_holders(

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        candidate: &Candidate<T>,

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        stake: Stake<T::Balance>,

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    ) -> Result<(), Error<T>> {

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        let total_staked = Self::total_staked(candidate).0;

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        let total_staked = total_staked.err_add(&stake.0)?;

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        Self::set_total_staked(candidate, Stake(total_staked));

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        Ok(())

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    /// Decrease the total stake of a pool without creating new shares, which basically decrease

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    /// the value of each share.

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2

    fn slash_stake_among_holders(

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        candidate: &Candidate<T>,

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        stake: Stake<T::Balance>,

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    ) -> Result<(), Error<T>> {

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        let total_staked = Self::total_staked(candidate).0;

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        let total_staked = total_staked.err_sub(&stake.0)?;

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        Self::set_total_staked(candidate, Stake(total_staked));

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        Ok(())

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2

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    /// Add new shares for that delegator towards the given candidate.

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    /// Function returns the value of those new shares.

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    /// Returns an error if underflow/overflows occurs.

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    fn add_shares(

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        candidate: &Candidate<T>,

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        delegator: &Delegator<T>,

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        shares: Shares<T::Balance>,

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    ) -> Result<Stake<T::Balance>, Error<T>> {

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        ensure!(!shares.0.is_zero(), Error::StakeMustBeNonZero);

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        let stake = Self::shares_to_stake_or_init(candidate, shares)?;

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        let old_shares = Self::shares(candidate, delegator);

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        let new_shares_supply = Self::shares_supply(candidate).0.err_add(&shares.0)?;

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        let new_shares = old_shares.0.err_add(&shares.0)?;

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        let new_total_stake = Self::total_staked(candidate).0.err_add(&stake.0)?;

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        let new_pool_member = old_shares.0.is_zero();

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        let mut new_delegator = false;

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493

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        DelegatorCandidateSummaries::<T>::mutate(&delegator, &candidate, |summary| {

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            if summary.is_empty() {

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                new_delegator = true;

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424

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            summary.set_pool(Self::pool_kind(), true);

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});

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493

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        CandidateSummaries::<T>::mutate(&candidate, |summary| {

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            if new_pool_member {

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                let count = summary.pool_delegators_mut(Self::pool_kind());

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                *count = count.saturating_add(1);

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453

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            if new_delegator {

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                summary.delegators = summary.delegators.saturating_add(1);

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424

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});

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493

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        Self::set_shares_supply(candidate, Shares(new_shares_supply));

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        Self::set_shares(candidate, delegator, Shares(new_shares));

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        Self::set_total_staked(candidate, Stake(new_total_stake));

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493

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        Ok(stake)

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    /// Remove shares for that delegator towards the given candidate.

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    /// Function returns the value of those removed shares.

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    /// Returns an error if that delegator don't have enough shares or if underflow/overflows occurs.

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    fn sub_shares(

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        candidate: &Candidate<T>,

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        delegator: &Delegator<T>,

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        shares: Shares<T::Balance>,

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    ) -> Result<Stake<T::Balance>, Error<T>> {

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        ensure!(!shares.0.is_zero(), Error::StakeMustBeNonZero);

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        let stake = Self::shares_to_stake(candidate, shares)?;

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        let new_shares_supply = Self::shares_supply(candidate).0.err_sub(&shares.0)?;

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        let new_shares = Self::shares(candidate, delegator).0.err_sub(&shares.0)?;

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        let new_total_stake = Self::total_staked(candidate).0.err_sub(&stake.0)?;

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        let rem_pool_member = new_shares.is_zero();

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        let mut rem_delegator = false;

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        DelegatorCandidateSummaries::<T>::mutate_exists(&delegator, &candidate, |summary| {

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            let mut s = summary.unwrap_or_default();

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            if rem_pool_member {

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                s.set_pool(Self::pool_kind(), false);

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            // storage entry will be deleted if empty

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            if s.is_empty() {

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200

                rem_delegator = true;

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                *summary = None;

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200

            } else {

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                *summary = Some(s)

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};

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});

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        CandidateSummaries::<T>::mutate_exists(&candidate, |summary| {

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            let mut s = summary.unwrap_or_default();

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233

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            if rem_pool_member {

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                let count = s.pool_delegators_mut(Self::pool_kind());

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                *count = count.saturating_sub(1);

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216

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            if rem_delegator {

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                s.delegators = s.delegators.saturating_sub(1);

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200

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            // storage entry will be deleted if empty

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233

            if s.delegators == 0 {

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                *summary = None;

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            } else {

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74

                *summary = Some(s)

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});

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254

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        Self::set_shares_supply(candidate, Shares(new_shares_supply));

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        Self::set_shares(candidate, delegator, Shares(new_shares));

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        Self::set_total_staked(candidate, Stake(new_total_stake));

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        Ok(stake)

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474

    fn increase_hold(

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        candidate: &Candidate<T>,

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        delegator: &Delegator<T>,

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        stake: &Stake<T::Balance>,

265

474

    ) -> Result<(), Error<T>> {

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        let hold = Self::hold(candidate, delegator);

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        let hold = hold.0.err_add(&stake.0)?;

268

474

        Self::set_hold(candidate, delegator, Stake(hold));

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        Ok(())

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474

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233

    fn decrease_hold(

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        candidate: &Candidate<T>,

274

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        delegator: &Delegator<T>,

275

233

        stake: &Stake<T::Balance>,

276

233

    ) -> Result<(), Error<T>> {

277

233

        let hold = Self::hold(candidate, delegator);

278

233

        let hold = hold.0.err_sub(&stake.0)?;

279

233

        Self::set_hold(candidate, delegator, Stake(hold));

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        Ok(())

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233

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283

284

470

pub fn check_candidate_consistency<T: Config>(candidate: &Candidate<T>) -> Result<(), Error<T>> {

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    let total0 = Pools::<T>::get(candidate, &PoolsKey::CandidateTotalStake);

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470

287

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    let joining = Joining::<T>::total_staked(candidate).0;

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470

    let auto = AutoCompounding::<T>::total_staked(candidate).0;

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    let manual = ManualRewards::<T>::total_staked(candidate).0;

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291

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    let total1 = joining

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        .checked_add(&auto)

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        .ok_or(Error::InconsistentState)?

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        .checked_add(&manual)

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        .ok_or(Error::InconsistentState)?;

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297

470

    ensure!(total0 == total1, Error::InconsistentState);

298

299

470

    Ok(())

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470

301

302

macro_rules! impl_pool {

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    ($name:ident, $shares:ident, $supply:ident, $total:ident, $hold: ident, $init:expr $(,)?) => {

304

        pub struct $name<T>(PhantomData<T>);

305

        impl<T: Config> Pool<T> for $name<T> {

306

1710

            fn shares(candidate: &Candidate<T>, delegator: &Delegator<T>) -> Shares<T::Balance> {

307

1710

                Shares(Pools::<T>::get(

308

1710

                    candidate,

309

1710

                    &PoolsKey::$shares {

310

1710

                        delegator: delegator.clone(),

311

1710

},

312

1710

))

313

1710

314

315

3049

            fn shares_supply(candidate: &Candidate<T>) -> Shares<T::Balance> {

316

3049

                Shares(Pools::<T>::get(candidate, &PoolsKey::$supply))

317

3049

318

319

6498

            fn total_staked(candidate: &Candidate<T>) -> Stake<T::Balance> {

320

6498

                Stake(Pools::<T>::get(candidate, &PoolsKey::$total))

321

6498

322

323

1196

            fn hold(candidate: &Candidate<T>, delegator: &Delegator<T>) -> Stake<T::Balance> {

324

1196

                Stake(Pools::<T>::get(

325

1196

                    candidate,

326

1196

                    &PoolsKey::$hold {

327

1196

                        delegator: delegator.clone(),

328

1196

},

329

1196

))

330

1196

331

332

726

            fn set_shares(

333

726

                candidate: &Candidate<T>,

334

726

                delegator: &Delegator<T>,

335

726

                value: Shares<T::Balance>,

336

726

) {

337

726

                Pools::<T>::set(

338

726

                    candidate,

339

726

                    &PoolsKey::$shares {

340

726

                        delegator: delegator.clone(),

341

726

},

342

726

                    value.0,

343

726

344

726

345

346

726

            fn set_shares_supply(candidate: &Candidate<T>, value: Shares<T::Balance>) {

347

726

                Pools::<T>::set(candidate, &PoolsKey::$supply, value.0)

348

726

349

350

760

            fn set_total_staked(candidate: &Candidate<T>, value: Stake<T::Balance>) {

351

760

                Pools::<T>::set(candidate, &PoolsKey::$total, value.0)

352

760

353

354

722

            fn set_hold(

355

722

                candidate: &Candidate<T>,

356

722

                delegator: &Delegator<T>,

357

722

                value: Stake<T::Balance>,

358

722

) {

359

722

                Pools::<T>::set(

360

722

                    candidate,

361

722

                    &PoolsKey::$hold {

362

722

                        delegator: delegator.clone(),

363

722

},

364

722

                    value.0,

365

722

366

722

367

368

496

            fn initial_share_value() -> Stake<T::Balance> {

369

496

                Stake($init)

370

496

371

372

1418

            fn pool_kind() -> PoolKind {

373

1418

                PoolKind::$name

374

1418

375

376

};

377

378

379

impl_pool!(

380

    Joining,

381

    JoiningShares,

382

    JoiningSharesSupply,

383

    JoiningSharesTotalStaked,

384

    JoiningSharesHeldStake,

385

    if cfg!(test) { 2u32 } else { 1 }.into(),

386

);

387

388

impl_pool!(

389

    AutoCompounding,

390

    AutoCompoundingShares,

391

    AutoCompoundingSharesSupply,

392

    AutoCompoundingSharesTotalStaked,

393

    AutoCompoundingSharesHeldStake,

394

    T::InitialAutoCompoundingShareValue::get(),

395

);

396

397

impl_pool!(

398

    ManualRewards,

399

    ManualRewardsShares,

400

    ManualRewardsSharesSupply,

401

    ManualRewardsSharesTotalStaked,

402

    ManualRewardsSharesHeldStake,

403

    T::InitialManualClaimShareValue::get(),

404

);

405

406

impl_pool!(

407

    Leaving,

408

    LeavingShares,

409

    LeavingSharesSupply,

410

    LeavingSharesTotalStaked,

411

    LeavingSharesHeldStake,

412

    if cfg!(test) { 3u32 } else { 1u32 }.into(),

413

);

414

415

impl<T: Config> ManualRewards<T> {

416

    #[allow(dead_code)]

417

16

    pub fn pending_rewards(

418

16

        candidate: &Candidate<T>,

419

16

        delegator: &Delegator<T>,

420

16

    ) -> Result<Stake<T::Balance>, Error<T>> {

421

16

        let shares = Self::shares(candidate, delegator);

422

16

423

16

        if shares.0.is_zero() {

424

5

            return Ok(Stake(0u32.into()));

425

11

426

11

427

11

        let counter = Pools::<T>::get(candidate, &PoolsKey::ManualRewardsCounter);

428

11

        let checkpoint = Pools::<T>::get(

429

11

            candidate,

430

11

            &PoolsKey::ManualRewardsCheckpoint {

431

11

                delegator: delegator.clone(),

432

11

},

433

11

);

434

435

        // TODO: Should be safe to wrap around.

436

11

        let diff = counter.err_sub(&checkpoint)?;

437

11

        Ok(Stake(diff.err_mul(&shares.0)?))

438

16

439

440

    /// Increase the rewards of the ManualRewards pool with best effort.

441

    /// Returns the actual amount distributed (after rounding).

442

29

    pub fn increase_rewards(

443

29

        candidate: &Candidate<T>,

444

29

        rewards: Stake<T::Balance>,

445

29

    ) -> Result<Stake<T::Balance>, Error<T>> {

446

29

        let Shares(supply) = Self::shares_supply(candidate);

447

29

        if supply.is_zero() {

448

            return Ok(Stake(Zero::zero()));

449

29

450

451

29

        let rewards_per_share = rewards

452

29

.0

453

29

            .checked_div(&supply)

454

29

            .ok_or(Error::<T>::InconsistentState)?;

455

29

        if rewards_per_share.is_zero() {

456

            return Ok(Stake(Zero::zero()));

457

29

458

459

29

        let rewards = rewards_per_share.err_mul(&supply)?;

460

461

29

        let counter = Pools::<T>::get(candidate, &PoolsKey::ManualRewardsCounter);

462

29

        let counter = counter.err_add(&rewards_per_share)?;

463

29

        Pools::<T>::set(candidate, &PoolsKey::ManualRewardsCounter, counter);

464

29

465

29

        Ok(Stake(rewards))

466

29

467

468

89

    pub fn claim_rewards(

469

89

        candidate: &Candidate<T>,

470

89

        delegator: &Delegator<T>,

471

89

    ) -> Result<Stake<T::Balance>, Error<T>> {

472

89

        let shares = Self::shares(candidate, delegator);

473

89

474

89

        let counter = Pools::<T>::get(candidate, &PoolsKey::ManualRewardsCounter);

475

89

        let checkpoint = Pools::<T>::get(

476

89

            candidate,

477

89

            &PoolsKey::ManualRewardsCheckpoint {

478

89

                delegator: delegator.clone(),

479

89

},

480

89

);

481

482

        // TODO: Should be safe to wrap around.

483

89

        let diff = counter.err_sub(&checkpoint)?;

484

485

89

        if diff.is_zero() {

486

80

            return Ok(Stake(0u32.into()));

487

9

488

489

9

        let rewards = diff.err_mul(&shares.0)?;

490

491

        // Update checkpoint

492

9

        Pools::<T>::set(

493

9

            candidate,

494

9

            &PoolsKey::ManualRewardsCheckpoint {

495

9

                delegator: delegator.clone(),

496

9

},

497

9

            counter,

498

9

);

499

9

500

9

        Ok(Stake(rewards))

501

89

502

503

504

/// Perform rewards distribution for the provided candidate.

505

///

506

/// The pallet considered that it already posses the rewards in its account,

507

/// and it is the responsibility of the caller to transfer or mint the currency

508

/// to the staking pallet account.

509

///

510

/// Rewards are split using `RewardsCollatorCommission` between the candidate

511

/// and all the delegators (including the candidate self-delegation). For each,

512

/// the rewards are then split according to the value of all the ManualRewards

513

/// and AutoCompounding shares.

514

///

515

/// As candidate rewards will give increase the candidate auto compounding

516

/// self-delegation, the delegator rewards are distributed first. ManualRewards

517

/// pool rewards are first distributed by increasing the pool counter, which may

518

/// result in some rounding. As distributing the AutoCompounding pool rewards

519

/// consists of simply increasing `AutoCompoundingSharesTotalStaked`, it is not

520

/// subject to rounding and it can absorb the rounding dust from ManualRewards

521

/// reward distribution.

522

///

523

/// Then it is time to distribute the candidate dedicated rewards. For

524

/// AutoCompounding, it is as if the candidate received the rewards then

525

/// self-delegated (instantly). It is thus implemented by creating new

526

/// AutoCompounding shares. This can lead to some rounding, which will be

527

/// absorbed in the ManualRewards distribution, which simply consist of

528

/// transfering the funds to the candidate account.

529

3135

#[frame_support::transactional]

530

pub fn distribute_rewards<T: Config>(

531

    candidate: &Candidate<T>,

532

    rewards: CreditOf<T>,

533

) -> DispatchResultWithPostInfo {

534

    let candidate_manual_rewards = distribute_rewards_inner::<T>(candidate, rewards.peek())?;

535

536

    let (candidate_manual_rewards, other_rewards) = rewards.split(candidate_manual_rewards);

537

538

    if !candidate_manual_rewards.peek().is_zero() {

539

        T::Currency::resolve(candidate, candidate_manual_rewards)

540

1

            .map_err(|_| DispatchError::NoProviders)?;

541

542

543

    T::Currency::resolve(&T::StakingAccount::get(), other_rewards)

544

33

        .map_err(|_| DispatchError::NoProviders)?;

545

546

    Ok(Some(T::WeightInfo::distribute_rewards()).into())

547

548

549

1045

fn distribute_rewards_inner<T: Config>(

550

1045

    candidate: &Candidate<T>,

551

1045

    rewards: T::Balance,

552

1045

) -> Result<T::Balance, Error<T>> {

553

1045

    // `RewardsCollatorCommission` is a `Perbill` so we're not worried about overflow.

554

1045

    let candidate_rewards = T::RewardsCollatorCommission::get() * rewards;

555

1045

    let delegators_rewards = rewards.err_sub(&candidate_rewards)?;

556

557

1045

    let Stake(auto_total_stake) = AutoCompounding::<T>::total_staked(candidate);

558

1045

    let Stake(manual_total_stake) = ManualRewards::<T>::total_staked(candidate);

559

1045

    let combined_total_stake = auto_total_stake.err_add(&manual_total_stake)?;

560

561

1045

    let candidate_manual_stake = if manual_total_stake.is_zero() {

562

1016

        Zero::zero()

563

    } else {

564

29

        ManualRewards::<T>::computed_stake(candidate, candidate)?.0

565

};

566

567

    // Distribute delegators ManualRewards rewards, it implies some rounding.

568

1045

    let delegators_manual_rewards = if manual_total_stake.is_zero() {

569

1016

        Zero::zero()

570

    } else {

571

29

        let rewards = delegators_rewards.mul_div(manual_total_stake, combined_total_stake)?;

572

29

        ManualRewards::<T>::increase_rewards(candidate, Stake(rewards))?.0

573

};

574

575

    // Distribute delegators AutoCompounding rewards with dust from ManualRewards.

576

    // If there is no auto compounding stake but auto compounding rewards it

577

    // means it comes from manual rewards rounding. Having non-zero total stake

578

    // with 0 share supply will cause issues, so in this case we distribute this

579

    // dust as candidate manual rewards.

580

1045

    let delegators_auto_rewards = delegators_rewards.err_sub(&delegators_manual_rewards)?;

581

1045

    let (delegators_auto_rewards, delegators_auto_dust) = if !auto_total_stake.is_zero() {

582

24

        AutoCompounding::<T>::share_stake_among_holders(candidate, Stake(delegators_auto_rewards))?;

583

24

        (delegators_auto_rewards, Zero::zero())

584

    } else {

585

1021

        (Zero::zero(), delegators_auto_rewards)

586

};

587

588

    // Distribute candidate AutoCompounding rewards, it implies some rounding.

589

1045

    let candidate_auto_rewards = if auto_total_stake.is_zero() {

590

1021

        Zero::zero()

591

    } else {

592

        'a: {

593

24

            let candidate_auto_stake =

594

24

                AutoCompounding::<T>::computed_stake(candidate, candidate)?.0;

595

24

            let candidate_combined_stake = candidate_manual_stake.err_add(&candidate_auto_stake)?;

596

597

24

            if candidate_combined_stake.is_zero() {

598

1

                break 'a Zero::zero();

599

23

600

601

23

            let rewards =

602

23

                candidate_rewards.mul_div(candidate_auto_stake, candidate_combined_stake)?;

603

23

            let new_shares = AutoCompounding::<T>::stake_to_shares(candidate, Stake(rewards))?;

604

605

23

            if new_shares.0.is_zero() {

606

6

                break 'a Zero::zero();

607

17

608

17

609

17

            AutoCompounding::<T>::add_shares(candidate, candidate, new_shares)?.0

610

611

};

612

613

    // Distribute candidate ManualRewards rewards with dust from AutoCompounding.

614

    // The amount is returned by the function and will be transfered to the candidate account.

615

1045

    let candidate_manual_rewards = candidate_rewards

616

1045

        .err_sub(&candidate_auto_rewards)?

617

1045

        .err_add(&delegators_auto_dust)?;

618

619

1045

    let additional_stake = delegators_auto_rewards.err_add(&candidate_auto_rewards)?;

620

1045

    Candidates::<T>::add_total_stake(candidate, &Stake(additional_stake))?;

621

622

1045

    Pallet::<T>::deposit_event(Event::<T>::RewardedCollator {

623

1045

        collator: candidate.clone(),

624

1045

        auto_compounding_rewards: candidate_auto_rewards,

625

1045

        manual_claim_rewards: candidate_manual_rewards,

626

1045

});

627

1045

    Pallet::<T>::deposit_event(Event::<T>::RewardedDelegators {

628

1045

        collator: candidate.clone(),

629

1045

        auto_compounding_rewards: delegators_auto_rewards,

630

1045

        manual_claim_rewards: delegators_manual_rewards,

631

1045

});

632

1045

633

1045

    Ok(candidate_manual_rewards)

634

1045

635

636

const MASK_JOINING: u8 = 1u8;

637

const MASK_AUTO: u8 = 1u8 << 1;

638

const MASK_MANUAL: u8 = 1u8 << 2;

639

const MASK_LEAVING: u8 = 1u8 << 3;

640

641

/// Enum of all available pools.

642

/// Must match with the names of the pool structs generated with `impl_pool!`.

643

#[derive(

644

4944

    RuntimeDebug, PartialEq, Eq, Encode, Decode, Copy, Clone, TypeInfo, Serialize, Deserialize,

645

)]

646

pub enum PoolKind {

647

    Joining,

648

    AutoCompounding,

649

    ManualRewards,

650

    Leaving,

651

652

653

/// Restricted list of pools that represent active delegation. Those can be targetted by joining

654

/// requests.

655

#[derive(

656

2472

    RuntimeDebug, PartialEq, Eq, Encode, Decode, Copy, Clone, TypeInfo, Serialize, Deserialize,

657

)]

658

pub enum ActivePoolKind {

659

412

    AutoCompounding,

660

415

    ManualRewards,

661

662

663

impl From<ActivePoolKind> for PoolKind {

664

6

    fn from(value: ActivePoolKind) -> Self {

665

6

        match value {

666

3

            ActivePoolKind::AutoCompounding => PoolKind::AutoCompounding,

667

3

            ActivePoolKind::ManualRewards => PoolKind::ManualRewards,

668

669

6

670

671

672

impl PoolKind {

673

6190

    fn to_bitmask(&self) -> u8 {

674

6190

        match self {

675

3445

            Self::Joining => MASK_JOINING,

676

1735

            Self::AutoCompounding => MASK_AUTO,

677

315

            Self::ManualRewards => MASK_MANUAL,

678

695

            Self::Leaving => MASK_LEAVING,

679

680

6190

681

682

683

/// Keeps track of which pools of some candidate a delegator is into.

684

/// This is used in storage to have a quick way to fetch all the delegations of

685

/// a delegator, and then know exactly which storage entries to look at to get

686

/// more detailed info.

687

#[derive(

688

    RuntimeDebug,

689

    Default,

690

    PartialEq,

691

Eq,

692

    Encode,

693

    Decode,

694

    Copy,

695

    Clone,

696

1236

    TypeInfo,

697

    Serialize,

698

    Deserialize,

699

    MaxEncodedLen,

700

)]

701

pub struct DelegatorCandidateSummary(pub(crate) u8);

702

703

impl DelegatorCandidateSummary {

704

18

    pub fn new() -> Self {

705

18

        Self(0)

706

18

707

708

    fn bit(&self, mask: u8) -> bool {

709

        self.0 & mask != 0

710

711

712

6266

    fn set_bit(&mut self, mask: u8, value: bool) {

713

6266

        if value {

714

4391

            self.0 = self.0 | mask

715

        } else {

716

1737

            self.0 = self.0 & !mask

717

718

6266

719

720

6323

    pub fn is_empty(&self) -> bool {

721

6323

        self.0 == 0

722

6323

723

724

    pub fn joining(&self) -> bool {

725

        self.bit(MASK_JOINING)

726

727

728

    pub fn auto(&self) -> bool {

729

        self.bit(MASK_AUTO)

730

731

732

    pub fn manual(&self) -> bool {

733

        self.bit(MASK_MANUAL)

734

735

736

    pub fn leaving(&self) -> bool {

737

        self.bit(MASK_LEAVING)

738

739

740

    pub fn pool(&self, pool: PoolKind) -> bool {

741

        self.bit(pool.to_bitmask())

742

743

744

6168

    pub fn set_pool(&mut self, pool: PoolKind, value: bool) {

745

6168

        self.set_bit(pool.to_bitmask(), value)

746

6168

747

748

29

    pub fn with_bit(mut self, mask: u8, value: bool) -> Self {

749

29

        self.set_bit(mask, value);

750

29

        self

751

29

752

753

3

    pub fn with_joining(self, value: bool) -> Self {

754

3

        self.with_bit(MASK_JOINING, value)

755

3

756

757

1

    pub fn with_auto(self, value: bool) -> Self {

758

1

        self.with_bit(MASK_AUTO, value)

759

1

760

761

1

    pub fn with_manual(self, value: bool) -> Self {

762

1

        self.with_bit(MASK_MANUAL, value)

763

1

764

765

2

    pub fn with_leaving(self, value: bool) -> Self {

766

2

        self.with_bit(MASK_LEAVING, value)

767

2

768

769

22

    pub fn with_pool(self, pool: PoolKind, value: bool) -> Self {

770

22

        self.with_bit(pool.to_bitmask(), value)

771

22

772

773

774

/// Keeps track of stats that are useful for dApps and block explorers which can

775

/// be tricky or expensive to gather otherwise.

776

#[derive(

777

    RuntimeDebug,

778

    Default,

779

    PartialEq,

780

Eq,

781

    Encode,

782

    Decode,

783

    Copy,

784

    Clone,

785

6180

    TypeInfo,

786

    Serialize,

787

    Deserialize,

788

    MaxEncodedLen,

789

)]

790

pub struct CandidateSummary {

791

    /// Amount of delegators in any pool without duplicates.

792

    pub delegators: u32,

793

    /// Amount of joining delegators. A single delegator joining multiple times

794

    /// only count once.

795

    pub joining_delegators: u32,

796

    /// Amount of delegators in the auto compounding pool.

797

    pub auto_compounding_delegators: u32,

798

    /// Amount of delegators in the manual rewards pool.

799

    pub manual_rewards_delegators: u32,

800

    /// Amount of leaving delegators. A single delegator leaving multiple times

801

    //// only count once.

802

    pub leaving_delegators: u32,

803

804

805

impl CandidateSummary {

806

5789

    pub fn pool_delegators_mut(&mut self, pool: PoolKind) -> &mut u32 {

807

5789

        match pool {

808

3226

            PoolKind::Joining => &mut self.joining_delegators,

809

1702

            PoolKind::AutoCompounding => &mut self.auto_compounding_delegators,

810

310

            PoolKind::ManualRewards => &mut self.manual_rewards_delegators,

811

551

            PoolKind::Leaving => &mut self.leaving_delegators,

812

813

5789

814

815

18

    pub fn with_pool(mut self, pool: PoolKind, count: u32) -> Self {

816

18

        let pool = self.pool_delegators_mut(pool);

817

18

        *pool = count;

818

18

        self

819

18

820