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