package keeper import ( "fmt" sdk "github.com/cosmos/cosmos-sdk/types" "github.com/kava-labs/kava/x/incentive/types" ) // AccumulateSwapRewards calculates new rewards to distribute this block and updates the global indexes to reflect this. // The provided rewardPeriod must be valid to avoid panics in calculating time durations. func (k Keeper) AccumulateSwapRewards(ctx sdk.Context, rewardPeriod types.MultiRewardPeriod) { previousAccrualTime, found := k.GetSwapRewardAccrualTime(ctx, rewardPeriod.CollateralType) if !found { previousAccrualTime = ctx.BlockTime() } indexes, found := k.GetSwapRewardIndexes(ctx, rewardPeriod.CollateralType) if !found { indexes = types.RewardIndexes{} } acc := types.NewAccumulator(previousAccrualTime, indexes) totalSource := k.getSwapTotalSourceShares(ctx, rewardPeriod.CollateralType) acc.Accumulate(rewardPeriod, totalSource, ctx.BlockTime()) k.SetSwapRewardAccrualTime(ctx, rewardPeriod.CollateralType, acc.PreviousAccumulationTime) if len(acc.Indexes) > 0 { // the store panics when setting empty or nil indexes k.SetSwapRewardIndexes(ctx, rewardPeriod.CollateralType, acc.Indexes) } } // getSwapTotalSourceShares fetches the sum of all source shares for a swap reward. // In the case of swap, these are the total (swap module) shares in a particular pool. func (k Keeper) getSwapTotalSourceShares(ctx sdk.Context, poolID string) sdk.Dec { totalShares, found := k.swapKeeper.GetPoolShares(ctx, poolID) if !found { totalShares = sdk.ZeroInt() } return sdk.NewDecFromInt(totalShares) } // InitializeSwapReward creates a new claim with zero rewards and indexes matching the global indexes. // If the claim already exists it just updates the indexes. func (k Keeper) InitializeSwapReward(ctx sdk.Context, poolID string, owner sdk.AccAddress) { claim, found := k.GetSwapClaim(ctx, owner) if !found { claim = types.NewSwapClaim(owner, sdk.Coins{}, nil) } globalRewardIndexes, found := k.GetSwapRewardIndexes(ctx, poolID) if !found { globalRewardIndexes = types.RewardIndexes{} } claim.RewardIndexes = claim.RewardIndexes.With(poolID, globalRewardIndexes) k.SetSwapClaim(ctx, claim) } // SynchronizeSwapReward updates the claim object by adding any accumulated rewards // and updating the reward index value. func (k Keeper) SynchronizeSwapReward(ctx sdk.Context, poolID string, owner sdk.AccAddress, shares sdk.Int) { claim, found := k.GetSwapClaim(ctx, owner) if !found { return } claim = k.synchronizeSwapReward(ctx, claim, poolID, owner, shares) k.SetSwapClaim(ctx, claim) } // synchronizeSwapReward updates the reward and indexes in a swap claim for one pool. func (k *Keeper) synchronizeSwapReward(ctx sdk.Context, claim types.SwapClaim, poolID string, owner sdk.AccAddress, shares sdk.Int) types.SwapClaim { globalRewardIndexes, found := k.GetSwapRewardIndexes(ctx, poolID) if !found { // The global factor is only not found if // - the pool has not started accumulating rewards yet (either there is no reward specified in params, or the reward start time hasn't been hit) // - OR it was wrongly deleted from state (factors should never be removed while unsynced claims exist) // If not found we could either skip this sync, or assume the global factor is zero. // Skipping will avoid storing unnecessary factors in the claim for non rewarded pools. // And in the event a global factor is wrongly deleted, it will avoid this function panicking when calculating rewards. return claim } userRewardIndexes, found := claim.RewardIndexes.Get(poolID) if !found { // Normally the reward indexes should always be found. // But if a pool was not rewarded then becomes rewarded (ie a reward period is added to params), then the indexes will be missing from claims for that pool. // So given the reward period was just added, assume the starting value for any global reward indexes, which is an empty slice. userRewardIndexes = types.RewardIndexes{} } newRewards, err := k.CalculateRewards(userRewardIndexes, globalRewardIndexes, sdk.NewDecFromInt(shares)) if err != nil { // Global reward factors should never decrease, as it would lead to a negative update to claim.Rewards. // This panics if a global reward factor decreases or disappears between the old and new indexes. panic(fmt.Sprintf("corrupted global reward indexes found: %v", err)) } claim.Reward = claim.Reward.Add(newRewards...) claim.RewardIndexes = claim.RewardIndexes.With(poolID, globalRewardIndexes) return claim } // GetSynchronizedSwapClaim fetches a swap claim from the store and syncs rewards for all rewarded pools. func (k Keeper) GetSynchronizedSwapClaim(ctx sdk.Context, owner sdk.AccAddress) (types.SwapClaim, bool) { claim, found := k.GetSwapClaim(ctx, owner) if !found { return types.SwapClaim{}, false } k.IterateSwapRewardIndexes(ctx, func(poolID string, _ types.RewardIndexes) bool { shares, found := k.swapKeeper.GetDepositorSharesAmount(ctx, owner, poolID) if !found { shares = sdk.ZeroInt() } claim = k.synchronizeSwapReward(ctx, claim, poolID, owner, shares) return false }) return claim, true }