package keeper import ( "time" sdk "github.com/cosmos/cosmos-sdk/types" sdkerrors "github.com/cosmos/cosmos-sdk/types/errors" "github.com/kava-labs/kava/x/issuance/types" ) // CreateNewAssetSupply creates a new AssetSupply in the store for the input denom func (k Keeper) CreateNewAssetSupply(ctx sdk.Context, denom string) types.AssetSupply { supply := types.NewAssetSupply( sdk.NewCoin(denom, sdk.ZeroInt()), time.Duration(0)) k.SetAssetSupply(ctx, supply, denom) return supply } // IncrementCurrentAssetSupply increments an asset's supply by the coin func (k Keeper) IncrementCurrentAssetSupply(ctx sdk.Context, coin sdk.Coin) error { supply, found := k.GetAssetSupply(ctx, coin.Denom) if !found { return sdkerrors.Wrap(types.ErrAssetNotFound, coin.Denom) } limit, err := k.GetRateLimit(ctx, coin.Denom) if err != nil { return err } if limit.Active { supplyLimit := sdk.NewCoin(coin.Denom, limit.Limit) // Resulting current supply must be under asset's limit if supplyLimit.IsLT(supply.CurrentSupply.Add(coin)) { return sdkerrors.Wrapf(types.ErrExceedsSupplyLimit, "increase %s, asset supply %s, limit %s", coin, supply.CurrentSupply, supplyLimit) } supply.CurrentSupply = supply.CurrentSupply.Add(coin) k.SetAssetSupply(ctx, supply, coin.Denom) } return nil } // UpdateTimeBasedSupplyLimits updates the time based supply for each asset, resetting it if the current time window has elapsed. func (k Keeper) UpdateTimeBasedSupplyLimits(ctx sdk.Context) { params := k.GetParams(ctx) previousBlockTime, found := k.GetPreviousBlockTime(ctx) if !found { previousBlockTime = ctx.BlockTime() k.SetPreviousBlockTime(ctx, previousBlockTime) } timeElapsed := ctx.BlockTime().Sub(previousBlockTime) for _, asset := range params.Assets { supply, found := k.GetAssetSupply(ctx, asset.Denom) // if a new asset has been added by governance, create a new asset supply for it in the store if !found { supply = k.CreateNewAssetSupply(ctx, asset.Denom) } if !asset.RateLimit.Active { // rate limiting is not active, reset supply supply.CurrentSupply = sdk.NewCoin(asset.Denom, sdk.ZeroInt()) supply.TimeElapsed = time.Duration(0) k.SetAssetSupply(ctx, supply, asset.Denom) continue } if asset.RateLimit.TimePeriod > supply.TimeElapsed+timeElapsed { // rate limiting is active, the rate-limiting period has not expired supply.TimeElapsed = supply.TimeElapsed + timeElapsed k.SetAssetSupply(ctx, supply, asset.Denom) continue } // rate limiting is active, the rate-limiting period has expired, and is now reset supply.TimeElapsed = time.Duration(0) supply.CurrentSupply = sdk.NewCoin(asset.Denom, sdk.ZeroInt()) k.SetAssetSupply(ctx, supply, asset.Denom) } k.SetPreviousBlockTime(ctx, ctx.BlockTime()) }