0g-chain/chaincfg/mint.go
2024-06-09 15:40:37 +08:00

49 lines
1.6 KiB
Go

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
}