87 lines
2.8 KiB
Go
87 lines
2.8 KiB
Go
package types
|
|
|
|
import (
|
|
"fmt"
|
|
|
|
sdk "github.com/cosmos/cosmos-sdk/types"
|
|
)
|
|
|
|
// Minter represents the minting state.
|
|
type Minter struct {
|
|
Inflation sdk.Dec `json:"inflation"` // current annual inflation rate
|
|
AnnualProvisions sdk.Dec `json:"annual_provisions"` // current annual expected provisions
|
|
}
|
|
|
|
// NewMinter returns a new Minter object with the given inflation and annual
|
|
// provisions values.
|
|
func NewMinter(inflation, annualProvisions sdk.Dec) Minter {
|
|
return Minter{
|
|
Inflation: inflation,
|
|
AnnualProvisions: annualProvisions,
|
|
}
|
|
}
|
|
|
|
// InitialMinter returns an initial Minter object with a given inflation value.
|
|
func InitialMinter(inflation sdk.Dec) Minter {
|
|
return NewMinter(
|
|
inflation,
|
|
sdk.NewDec(0),
|
|
)
|
|
}
|
|
|
|
// DefaultInitialMinter returns a default initial Minter object for a new chain
|
|
// which uses an inflation rate of 13%.
|
|
func DefaultInitialMinter() Minter {
|
|
return InitialMinter(
|
|
sdk.NewDecWithPrec(13, 2),
|
|
)
|
|
}
|
|
|
|
// validate minter
|
|
func ValidateMinter(minter Minter) error {
|
|
if minter.Inflation.LT(sdk.ZeroDec()) {
|
|
return fmt.Errorf("mint parameter Inflation should be positive, is %s",
|
|
minter.Inflation.String())
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// NextInflationRate returns the new inflation rate for the next hour.
|
|
func (m Minter) NextInflationRate(params 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 := m.Inflation.Add(inflationRateChange) // note inflationRateChange may be negative
|
|
if inflation.GT(params.InflationMax) {
|
|
inflation = params.InflationMax
|
|
}
|
|
if inflation.LT(params.InflationMin) {
|
|
inflation = params.InflationMin
|
|
}
|
|
|
|
return inflation
|
|
}
|
|
|
|
// NextAnnualProvisions returns the annual provisions based on current total
|
|
// supply and inflation rate.
|
|
func (m Minter) NextAnnualProvisions(_ Params, totalSupply sdk.Int) sdk.Dec {
|
|
return m.Inflation.MulInt(totalSupply)
|
|
}
|
|
|
|
// BlockProvision returns the provisions for a block based on the annual
|
|
// provisions rate.
|
|
func (m Minter) BlockProvision(params Params) sdk.Coin {
|
|
provisionAmt := m.AnnualProvisions.QuoInt(sdk.NewInt(int64(params.BlocksPerYear)))
|
|
return sdk.NewCoin(params.MintDenom, provisionAmt.TruncateInt())
|
|
}
|