/
reward.go
86 lines (72 loc) · 2.4 KB
/
reward.go
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package keeper
import (
"fmt"
sdk "github.com/cosmos/cosmos-sdk/types"
"github.com/umee-network/umee/v5/util/genmap"
"github.com/umee-network/umee/v5/x/oracle/types"
)
// prependUmeeIfUnique pushs `uumee` denom to the front of the list, if it is not yet included.
func prependUmeeIfUnique(voteTargets []string) []string {
if genmap.Contains(types.UmeeDenom, voteTargets) {
return voteTargets
}
rewardDenoms := make([]string, len(voteTargets)+1)
rewardDenoms[0] = types.UmeeDenom
copy(rewardDenoms[1:], voteTargets)
return rewardDenoms
}
// RewardBallotWinners is executed at the end of every voting period, where we
// give out a portion of seigniorage reward(reward-weight) to the oracle voters
// that voted correctly.
func (k Keeper) RewardBallotWinners(
ctx sdk.Context,
votePeriod int64,
rewardDistributionWindow int64,
voteTargets []string,
ballotWinners []types.Claim,
) {
// sum weight of the claims
var ballotPowerSum int64
for _, winner := range ballotWinners {
ballotPowerSum += winner.Weight
}
// early return - ballot was empty
if ballotPowerSum == 0 {
return
}
distributionRatio := sdk.NewDec(votePeriod).QuoInt64(rewardDistributionWindow)
var periodRewards sdk.DecCoins
rewardDenoms := prependUmeeIfUnique(voteTargets)
for _, denom := range rewardDenoms {
rewardPool := k.GetRewardPool(ctx, denom)
// return if there's no rewards to give out
if rewardPool.IsZero() {
continue
}
periodRewards = periodRewards.Add(sdk.NewDecCoinFromDec(
denom,
sdk.NewDecFromInt(rewardPool.Amount).Mul(distributionRatio),
))
}
// distribute rewards
var distributedReward sdk.Coins
for _, winner := range ballotWinners {
receiverVal := k.StakingKeeper.Validator(ctx, winner.Validator)
// in case absence of the validator, we just skip distribution
if receiverVal == nil {
continue
}
// reflects contribution
rewardCoins, _ := periodRewards.MulDec(sdk.NewDec(winner.Weight).QuoInt64(ballotPowerSum)).TruncateDecimal()
if rewardCoins.IsZero() {
continue
}
k.distrKeeper.AllocateTokensToValidator(ctx, receiverVal, sdk.NewDecCoinsFromCoins(rewardCoins...))
distributedReward = distributedReward.Add(rewardCoins...)
}
// move distributed reward to distribution module
err := k.bankKeeper.SendCoinsFromModuleToModule(ctx, types.ModuleName, k.distrName, distributedReward)
if err != nil {
panic(fmt.Errorf("failed to send coins to distribution module %w", err))
}
}