108 lines
4.1 KiB
Go
108 lines
4.1 KiB
Go
package keeper
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import (
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"fmt"
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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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"github.com/cosmos/cosmos-sdk/x/staking/exported"
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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 exported.ValidatorI) {
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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(), types.ValidatorOutstandingRewards{Rewards: 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 exported.ValidatorI) 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.Rewards = outstanding.GetRewards().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()) || fraction.IsNegative() {
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panic(fmt.Sprintf("fraction must be >=0 and <=1, current fraction: %v", fraction))
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}
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val := k.stakingKeeper.Validator(ctx, valAddr)
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// increment current period
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newPeriod := 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, newPeriod)
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slashEvent := types.NewValidatorSlashEvent(newPeriod, fraction)
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height := uint64(ctx.BlockHeight())
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k.SetValidatorSlashEvent(ctx, valAddr, height, newPeriod, slashEvent)
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}
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