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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,101 @@ | ||
| package app | ||
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|
||
| import ( | ||
| "context" | ||
| "time" | ||
|
|
||
| sdkmath "cosmossdk.io/math" | ||
| sdk "github.com/cosmos/cosmos-sdk/types" | ||
| minttypes "github.com/cosmos/cosmos-sdk/x/mint/types" | ||
| ) | ||
|
|
||
| var _ minttypes.InflationCalculationFn = InflationCalculationFn | ||
|
|
||
| const ( | ||
| nanosecondsPerSecond = 1_000_000_000 | ||
| secondsPerMinute = 60 | ||
| minutesPerHour = 60 | ||
| hoursPerDay = 24 | ||
| // daysPerYear is the mean length of the Gregorian calendar year. Note this | ||
| // value isn't 365 because 97 out of 400 years are leap years. See | ||
| // https://en.wikipedia.org/wiki/Year | ||
| daysPerYear = 365.2425 | ||
| secondsPerYear = int64(secondsPerMinute * minutesPerHour * hoursPerDay * daysPerYear) // 31,556,952 | ||
| nanosecondsPerYear = nanosecondsPerSecond * secondsPerYear // 31,556,952,000,000,000 | ||
|
|
||
| // genesis time - Tuesday, May 7, 2024 2:42:49 AM UTC | ||
| genesisTime = int64(1715049769) | ||
| ) | ||
|
|
||
| var ( | ||
| // initialInflationRate is the inflation rate that the network starts at. | ||
| initialInflationRate = sdkmath.LegacyMustNewDecFromStr("0.08") | ||
| // initialInflationRate is the max inflation rate at the first year based on bondedRatio | ||
| initialInflationRateMax = sdkmath.LegacyMustNewDecFromStr("0.10") | ||
| // initialInflationRate is the min inflation rate at the first year based on bondedRatio | ||
| initialInflationRateMin = sdkmath.LegacyMustNewDecFromStr("0.06") | ||
|
|
||
| // disinflationRate is the rate at which the inflation rate decreases each year. | ||
| disinflationRate = sdkmath.LegacyMustNewDecFromStr("0.08") | ||
| // targetInflationRate is the inflation rate that the network aims to | ||
| // stabilize at. In practice, targetInflationRate acts as a minimum so that | ||
| // the inflation rate doesn't decrease after reaching it. | ||
| targetInflationRate = sdkmath.LegacyMustNewDecFromStr("0.02") | ||
| ) | ||
|
|
||
| func InitialInflationRate() sdkmath.LegacyDec { | ||
| return initialInflationRate | ||
| } | ||
|
|
||
| func InitialInflationRateMax() sdkmath.LegacyDec { | ||
| return initialInflationRateMax | ||
| } | ||
|
|
||
| func InitialInflationRateMin() sdkmath.LegacyDec { | ||
| return initialInflationRateMin | ||
| } | ||
|
|
||
| func DisinflationRate() sdkmath.LegacyDec { | ||
| return disinflationRate | ||
| } | ||
|
|
||
| func TargetInflationRate() sdkmath.LegacyDec { | ||
| return targetInflationRate | ||
| } | ||
|
|
||
| func InflationCalculationFn(ctx context.Context, minter minttypes.Minter, params minttypes.Params, bondedRatio sdkmath.LegacyDec) sdkmath.LegacyDec { | ||
| sdkCtx := sdk.UnwrapSDKContext(ctx) | ||
| return CalculateInflationRate(sdkCtx, time.Unix(genesisTime, 0), bondedRatio) | ||
| } | ||
|
|
||
| func ProvideInflationCalculatorFn() minttypes.InflationCalculationFn { | ||
| return InflationCalculationFn | ||
| } | ||
|
|
||
| // CalculateInflationRate returns the inflation rate for the current year depending on | ||
| // the current block height in context. The inflation rate is expected to | ||
| // decrease every year according to the schedule specified in the README. | ||
| func CalculateInflationRate(ctx sdk.Context, genesis time.Time, bondedRatio sdkmath.LegacyDec) sdkmath.LegacyDec { | ||
| // initialRate = initialMax - (initialMax-initialMin)*bondedRatio | ||
| initialRate := initialInflationRateMax.Sub( | ||
| initialInflationRateMax.Sub(initialInflationRateMin).Mul(bondedRatio), | ||
| ) | ||
|
|
||
| // disinflatedRate = initialRate * (1 - disinflationRate)^((now - genesis).convertToYears()) | ||
| years := yearsSinceGenesis(genesis, ctx.BlockTime()) | ||
| disinflatedRate := initialRate.Mul( | ||
| sdkmath.LegacyOneDec().Sub(disinflationRate).Power(uint64(years)), | ||
| ) | ||
|
|
||
| // finalRate = max(disinflatedRate, convergenceRate) | ||
| return sdkmath.LegacyMaxDec(disinflatedRate, TargetInflationRate()) | ||
| } | ||
|
|
||
| // yearsSinceGenesis returns the number of years that have passed between | ||
| // genesis and current (rounded down). | ||
| func yearsSinceGenesis(genesis time.Time, current time.Time) (years int64) { | ||
| if current.Before(genesis) { | ||
| return 0 | ||
| } | ||
| return current.Sub(genesis).Nanoseconds() / nanosecondsPerYear | ||
| } |
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