package chaincfg import ( "github.com/tendermint/tendermint/libs/log" sdk "github.com/cosmos/cosmos-sdk/types" minttypes "github.com/cosmos/cosmos-sdk/x/mint/types" ) func CustomInflationCalculateFn(ctx sdk.Context, minter minttypes.Minter, params minttypes.Params, bondedRatio sdk.Dec) sdk.Dec { logger := ctx.Logger() if logger == nil { panic("logger is nil") } return customInflationCalculateFn(logger, minter, params, bondedRatio) } func customInflationCalculateFn(logger log.Logger, minter minttypes.Minter, params minttypes.Params, bondedRatio sdk.Dec) sdk.Dec { // The target annual inflation rate is recalculated for each previsions cycle. The // inflation is also subject to a rate change (positive or negative) depending on // the distance from the desired ratio (67%). The maximum rate change possible is // defined to be 13% per year, however the annual inflation is capped as between // 7% and 20%. // (1 - bondedRatio/GoalBonded) * InflationRateChange inflationRateChangePerYear := sdk.OneDec(). Sub(bondedRatio.Quo(params.GoalBonded)). Mul(params.InflationRateChange) inflationRateChange := inflationRateChangePerYear.Quo(sdk.NewDec(int64(params.BlocksPerYear))) // adjust the new annual inflation for this next cycle inflation := minter.Inflation.Add(inflationRateChange) // note inflationRateChange may be negative if inflation.GT(params.InflationMax) { inflation = params.InflationMax } if inflation.LT(params.InflationMin) { inflation = params.InflationMin } logger.Info( "calculated new annual inflation", "bondedRatio", bondedRatio, "inflation", inflation, "params", params, "minter", minter, ) return inflation }