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* Happy New Year! * Remove year entierly Co-authored-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io> * Remove years from copyright notice in the entire repo --------- Co-authored-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>
93 lines
3.5 KiB
Rust
93 lines
3.5 KiB
Rust
// Copyright (C) Parity Technologies (UK) Ltd.
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// This file is part of Polkadot.
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// Polkadot 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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// Polkadot 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 Polkadot. If not, see <http://www.gnu.org/licenses/>.
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//! An implementation of the `RewardValidators` trait used by `inclusion` that employs
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//! `pallet-staking` to compute the rewards.
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//!
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//! Based on <https://research.web3.foundation/en/latest/polkadot/overview/2-token-economics.html>
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//! which doesn't currently mention availability bitfields. As such, we don't reward them
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//! for the time being, although we will build schemes to do so in the future.
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use crate::{session_info, shared};
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use frame_support::traits::{Defensive, ValidatorSet};
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use primitives::{SessionIndex, ValidatorIndex};
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use sp_std::collections::btree_set::BTreeSet;
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/// The amount of era points given by backing a candidate that is included.
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pub const BACKING_POINTS: u32 = 20;
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/// The amount of era points given by dispute voting on a candidate.
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pub const DISPUTE_STATEMENT_POINTS: u32 = 20;
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/// Rewards validators for participating in parachains with era points in pallet-staking.
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pub struct RewardValidatorsWithEraPoints<C>(sp_std::marker::PhantomData<C>);
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impl<C> RewardValidatorsWithEraPoints<C>
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where
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C: pallet_staking::Config + session_info::Config,
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C::ValidatorSet: ValidatorSet<C::AccountId, ValidatorId = C::AccountId>,
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{
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/// Reward validators in session with points, but only if they are in the active set.
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fn reward_only_active(
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session_index: SessionIndex,
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indices: impl IntoIterator<Item = ValidatorIndex>,
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points: u32,
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) {
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let validators = session_info::Pallet::<C>::account_keys(&session_index);
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let validators = match validators
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.defensive_proof("account_keys are present for dispute_period sessions")
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{
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Some(validators) => validators,
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None => return,
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};
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// limit rewards to the active validator set
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let active_set: BTreeSet<_> = C::ValidatorSet::validators().into_iter().collect();
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let rewards = indices
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.into_iter()
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.filter_map(|i| validators.get(i.0 as usize).cloned())
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.filter(|v| active_set.contains(v))
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.map(|v| (v, points));
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<pallet_staking::Pallet<C>>::reward_by_ids(rewards);
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}
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}
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impl<C> crate::inclusion::RewardValidators for RewardValidatorsWithEraPoints<C>
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where
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C: pallet_staking::Config + shared::Config + session_info::Config,
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C::ValidatorSet: ValidatorSet<C::AccountId, ValidatorId = C::AccountId>,
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{
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fn reward_backing(indices: impl IntoIterator<Item = ValidatorIndex>) {
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let session_index = shared::Pallet::<C>::session_index();
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Self::reward_only_active(session_index, indices, BACKING_POINTS);
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}
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fn reward_bitfields(_validators: impl IntoIterator<Item = ValidatorIndex>) {}
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}
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impl<C> crate::disputes::RewardValidators for RewardValidatorsWithEraPoints<C>
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where
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C: pallet_staking::Config + session_info::Config,
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C::ValidatorSet: ValidatorSet<C::AccountId, ValidatorId = C::AccountId>,
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{
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fn reward_dispute_statement(
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session: SessionIndex,
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validators: impl IntoIterator<Item = ValidatorIndex>,
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) {
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Self::reward_only_active(session, validators, DISPUTE_STATEMENT_POINTS);
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}
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}
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