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// Copyright (C) Parity Technologies (UK) Ltd.
// This file is part of Parity Bridges Common.
// Parity Bridges Common is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// Parity Bridges Common is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with Parity Bridges Common. If not, see <http://www.gnu.org/licenses/>.
//! Code that allows relayers pallet to be used as a payment mechanism for the messages pallet.
use crate::{Config, Pallet};
use bp_messages::{
source_chain::{DeliveryConfirmationPayments, RelayersRewards},
LaneId, MessageNonce,
};
use bp_relayers::{RewardsAccountOwner, RewardsAccountParams};
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use frame_support::{sp_runtime::SaturatedConversion, traits::Get};
use sp_arithmetic::traits::{Saturating, Zero};
use sp_std::{collections::vec_deque::VecDeque, marker::PhantomData, ops::RangeInclusive};
/// Adapter that allows relayers pallet to be used as a delivery+dispatch payment mechanism
/// for the messages pallet.
pub struct DeliveryConfirmationPaymentsAdapter<T, MI, DeliveryReward>(
PhantomData<(T, MI, DeliveryReward)>,
impl<T, MI, DeliveryReward> DeliveryConfirmationPayments<T::AccountId>
for DeliveryConfirmationPaymentsAdapter<T, MI, DeliveryReward>
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where
T: Config + pallet_bridge_messages::Config<MI>,
MI: 'static,
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DeliveryReward: Get<T::Reward>,
{
type Error = &'static str;
fn pay_reward(
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messages_relayers: VecDeque<bp_messages::UnrewardedRelayer<T::AccountId>>,
confirmation_relayer: &T::AccountId,
received_range: &RangeInclusive<bp_messages::MessageNonce>,
) -> MessageNonce {
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let relayers_rewards =
bp_messages::calc_relayers_rewards::<T::AccountId>(messages_relayers, received_range);
let rewarded_relayers = relayers_rewards.len();
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register_relayers_rewards::<T>(
confirmation_relayer,
relayers_rewards,
RewardsAccountParams::new(
lane_id,
T::BridgedChainId::get(),
RewardsAccountOwner::BridgedChain,
),
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DeliveryReward::get(),
);
rewarded_relayers as _
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}
}
// Update rewards to given relayers, optionally rewarding confirmation relayer.
fn register_relayers_rewards<T: Config>(
confirmation_relayer: &T::AccountId,
relayers_rewards: RelayersRewards<T::AccountId>,
lane_id: RewardsAccountParams,
delivery_fee: T::Reward,
) {
// reward every relayer except `confirmation_relayer`
let mut confirmation_relayer_reward = T::Reward::zero();
for (relayer, messages) in relayers_rewards {
// sane runtime configurations guarantee that the number of messages will be below
// `u32::MAX`
let relayer_reward = T::Reward::saturated_from(messages).saturating_mul(delivery_fee);
if relayer != *confirmation_relayer {
Pallet::<T>::register_relayer_reward(lane_id, &relayer, relayer_reward);
confirmation_relayer_reward =
confirmation_relayer_reward.saturating_add(relayer_reward);
}
}
// finally - pay reward to confirmation relayer
Pallet::<T>::register_relayer_reward(
lane_id,
confirmation_relayer,
confirmation_relayer_reward,
);
}
#[cfg(test)]
mod tests {
use super::*;
use crate::{mock::*, RelayerRewards};
const RELAYER_1: AccountId = 1;
const RELAYER_2: AccountId = 2;
const RELAYER_3: AccountId = 3;
fn relayers_rewards() -> RelayersRewards<AccountId> {
vec![(RELAYER_1, 2), (RELAYER_2, 3)].into_iter().collect()
}
#[test]
fn confirmation_relayer_is_rewarded_if_it_has_also_delivered_messages() {
run_test(|| {
register_relayers_rewards::<TestRuntime>(
&RELAYER_2,
relayers_rewards(),
TEST_REWARDS_ACCOUNT_PARAMS,
assert_eq!(
RelayerRewards::<TestRuntime>::get(RELAYER_1, TEST_REWARDS_ACCOUNT_PARAMS),
);
assert_eq!(
RelayerRewards::<TestRuntime>::get(RELAYER_2, TEST_REWARDS_ACCOUNT_PARAMS),
});
}
#[test]
fn confirmation_relayer_is_not_rewarded_if_it_has_not_delivered_any_messages() {
register_relayers_rewards::<TestRuntime>(
&RELAYER_3,
relayers_rewards(),
TEST_REWARDS_ACCOUNT_PARAMS,
assert_eq!(
RelayerRewards::<TestRuntime>::get(RELAYER_1, TEST_REWARDS_ACCOUNT_PARAMS),
);
assert_eq!(
RelayerRewards::<TestRuntime>::get(RELAYER_2, TEST_REWARDS_ACCOUNT_PARAMS),
);
assert_eq!(
RelayerRewards::<TestRuntime>::get(RELAYER_3, TEST_REWARDS_ACCOUNT_PARAMS),
None
);