115 lines
4.5 KiB
Go
115 lines
4.5 KiB
Go
package keeper
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import (
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sdk "github.com/cosmos/cosmos-sdk/types"
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"github.com/cosmos/cosmos-sdk/x/distribution/types"
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)
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// initialize rewards for a new validator
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func (k Keeper) initializeValidator(ctx sdk.Context, val sdk.Validator) {
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// set initial historical rewards (period 0) with reference count of 1
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k.SetValidatorHistoricalRewards(ctx, val.GetOperator(), 0, types.NewValidatorHistoricalRewards(sdk.DecCoins{}, 1))
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// set current rewards (starting at period 1)
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k.SetValidatorCurrentRewards(ctx, val.GetOperator(), types.NewValidatorCurrentRewards(sdk.DecCoins{}, 1))
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// set accumulated commission
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k.SetValidatorAccumulatedCommission(ctx, val.GetOperator(), types.InitialValidatorAccumulatedCommission())
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// set outstanding rewards
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k.SetValidatorOutstandingRewards(ctx, val.GetOperator(), sdk.DecCoins{})
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}
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// increment validator period, returning the period just ended
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func (k Keeper) incrementValidatorPeriod(ctx sdk.Context, val sdk.Validator) uint64 {
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// fetch current rewards
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rewards := k.GetValidatorCurrentRewards(ctx, val.GetOperator())
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// calculate current ratio
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var current sdk.DecCoins
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if val.GetTokens().IsZero() {
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// can't calculate ratio for zero-token validators
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// ergo we instead add to the community pool
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feePool := k.GetFeePool(ctx)
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outstanding := k.GetValidatorOutstandingRewards(ctx, val.GetOperator())
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feePool.CommunityPool = feePool.CommunityPool.Add(rewards.Rewards)
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outstanding = outstanding.Sub(rewards.Rewards)
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k.SetFeePool(ctx, feePool)
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k.SetValidatorOutstandingRewards(ctx, val.GetOperator(), outstanding)
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current = sdk.DecCoins{}
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} else {
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// note: necessary to truncate so we don't allow withdrawing more rewards than owed
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current = rewards.Rewards.QuoDecTruncate(val.GetTokens().ToDec())
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}
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// fetch historical rewards for last period
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historical := k.GetValidatorHistoricalRewards(ctx, val.GetOperator(), rewards.Period-1).CumulativeRewardRatio
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// decrement reference count
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k.decrementReferenceCount(ctx, val.GetOperator(), rewards.Period-1)
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// set new historical rewards with reference count of 1
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k.SetValidatorHistoricalRewards(ctx, val.GetOperator(), rewards.Period, types.NewValidatorHistoricalRewards(historical.Add(current), 1))
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// set current rewards, incrementing period by 1
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k.SetValidatorCurrentRewards(ctx, val.GetOperator(), types.NewValidatorCurrentRewards(sdk.DecCoins{}, rewards.Period+1))
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return rewards.Period
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}
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// increment the reference count for a historical rewards value
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func (k Keeper) incrementReferenceCount(ctx sdk.Context, valAddr sdk.ValAddress, period uint64) {
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historical := k.GetValidatorHistoricalRewards(ctx, valAddr, period)
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if historical.ReferenceCount > 2 {
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panic("reference count should never exceed 2")
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}
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historical.ReferenceCount++
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k.SetValidatorHistoricalRewards(ctx, valAddr, period, historical)
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}
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// decrement the reference count for a historical rewards value, and delete if zero references remain
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func (k Keeper) decrementReferenceCount(ctx sdk.Context, valAddr sdk.ValAddress, period uint64) {
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historical := k.GetValidatorHistoricalRewards(ctx, valAddr, period)
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if historical.ReferenceCount == 0 {
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panic("cannot set negative reference count")
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}
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historical.ReferenceCount--
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if historical.ReferenceCount == 0 {
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k.DeleteValidatorHistoricalReward(ctx, valAddr, period)
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} else {
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k.SetValidatorHistoricalRewards(ctx, valAddr, period, historical)
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}
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}
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func (k Keeper) updateValidatorSlashFraction(ctx sdk.Context, valAddr sdk.ValAddress, fraction sdk.Dec) {
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if fraction.GT(sdk.OneDec()) {
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panic("fraction greater than one")
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}
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height := uint64(ctx.BlockHeight())
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currentFraction := sdk.ZeroDec()
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endedPeriod := k.GetValidatorCurrentRewards(ctx, valAddr).Period - 1
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current, found := k.GetValidatorSlashEvent(ctx, valAddr, height)
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if found {
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// there has already been a slash event this height,
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// and we don't need to store more than one,
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// so just update the current slash fraction
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currentFraction = current.Fraction
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} else {
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val := k.stakingKeeper.Validator(ctx, valAddr)
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// increment current period
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endedPeriod = k.incrementValidatorPeriod(ctx, val)
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// increment reference count on period we need to track
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k.incrementReferenceCount(ctx, valAddr, endedPeriod)
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}
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currentMultiplicand := sdk.OneDec().Sub(currentFraction)
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newMultiplicand := sdk.OneDec().Sub(fraction)
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updatedFraction := sdk.OneDec().Sub(currentMultiplicand.Mul(newMultiplicand))
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if updatedFraction.LT(sdk.ZeroDec()) {
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panic("negative slash fraction")
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}
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k.SetValidatorSlashEvent(ctx, valAddr, height, types.NewValidatorSlashEvent(endedPeriod, updatedFraction))
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}
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