mirror of
https://github.com/0glabs/0g-chain.git
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bfb9f7e20a
* cleanup begin/end block * update cdp BeginBlocker * update dist mint * fix tests * typo * add comment on CloseExpiredAuctions * fix tests
93 lines
3.3 KiB
Go
93 lines
3.3 KiB
Go
package keeper
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import (
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sdk "github.com/cosmos/cosmos-sdk/types"
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cdptypes "github.com/kava-labs/kava/x/cdp/types"
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"github.com/kava-labs/kava/x/kavadist/types"
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)
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// MintPeriodInflation mints new tokens according to the inflation schedule specified in the parameters
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func (k Keeper) MintPeriodInflation(ctx sdk.Context) error {
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params := k.GetParams(ctx)
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if !params.Active {
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ctx.EventManager().EmitEvent(
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sdk.NewEvent(
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types.EventTypeKavaDist,
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sdk.NewAttribute(types.AttributeKeyStatus, types.AttributeValueInactive),
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),
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)
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return nil
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}
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previousBlockTime, found := k.GetPreviousBlockTime(ctx)
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if !found {
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previousBlockTime = ctx.BlockTime()
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k.SetPreviousBlockTime(ctx, previousBlockTime)
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return nil
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}
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var err error
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for _, period := range params.Periods {
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switch {
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// Case 1 - period is fully expired
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case period.End.Before(previousBlockTime):
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continue
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// Case 2 - period has ended since the previous block time
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case period.End.After(previousBlockTime) && period.End.Before(ctx.BlockTime()):
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// calculate time elapsed relative to the periods end time
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timeElapsed := sdk.NewInt(period.End.Unix() - previousBlockTime.Unix())
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err = k.mintInflationaryCoins(ctx, period.Inflation, timeElapsed, types.GovDenom)
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// update the value of previousBlockTime so that the next period starts from the end of the last
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// period and not the original value of previousBlockTime
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previousBlockTime = period.End
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// Case 3 - period is ongoing
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case (period.Start.Before(previousBlockTime) || period.Start.Equal(previousBlockTime)) && period.End.After(ctx.BlockTime()):
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// calculate time elapsed relative to the current block time
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timeElapsed := sdk.NewInt(ctx.BlockTime().Unix() - previousBlockTime.Unix())
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err = k.mintInflationaryCoins(ctx, period.Inflation, timeElapsed, types.GovDenom)
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// Case 4 - period hasn't started
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case period.Start.After(ctx.BlockTime()) || period.Start.Equal(ctx.BlockTime()):
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continue
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}
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if err != nil {
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return err
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}
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}
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k.SetPreviousBlockTime(ctx, ctx.BlockTime())
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return nil
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}
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func (k Keeper) mintInflationaryCoins(ctx sdk.Context, inflationRate sdk.Dec, timePeriods sdk.Int, denom string) error {
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totalSupply := k.supplyKeeper.GetSupply(ctx).GetTotal().AmountOf(denom)
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// used to scale accumulator calculations by 10^18
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scalar := sdk.NewInt(1000000000000000000)
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// convert inflation rate to integer
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inflationInt := inflationRate.Mul(sdk.NewDecFromInt(scalar)).TruncateInt()
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// calculate the multiplier (amount to multiply the total supply by to achieve the desired inflation)
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// multiply the result by 10^-18 because RelativePow returns the result scaled by 10^18
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accumulator := sdk.NewDecFromInt(cdptypes.RelativePow(inflationInt, timePeriods, scalar)).Mul(sdk.SmallestDec())
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// calculate the number of coins to mint
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amountToMint := (sdk.NewDecFromInt(totalSupply).Mul(accumulator)).Sub(sdk.NewDecFromInt(totalSupply)).TruncateInt()
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if amountToMint.IsZero() {
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return nil
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}
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err := k.supplyKeeper.MintCoins(ctx, types.KavaDistMacc, sdk.NewCoins(sdk.NewCoin(denom, amountToMint)))
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if err != nil {
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return err
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}
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ctx.EventManager().EmitEvent(
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sdk.NewEvent(
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types.EventTypeKavaDist,
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sdk.NewAttribute(types.AttributeKeyInflation, sdk.NewCoin(denom, amountToMint).String()),
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),
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)
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return nil
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}
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