mirror of
https://gitlab.com/pulsechaincom/prysm-pulse.git
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71 lines
3.0 KiB
Go
71 lines
3.0 KiB
Go
// Package incentives defines Casper Proof of Stake rewards and penalties for validator
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// records based on Vitalik Buterin's Friendly Finality Gadget protocol. Validator balances
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// depend on time to finality as well as deposit-weighted functions. This package provides
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// pure functions that can then be incorporated into a beacon chain state transition.
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package incentives
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import (
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pb "github.com/prysmaticlabs/prysm/proto/beacon/p2p/v1"
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"github.com/prysmaticlabs/prysm/shared/mathutil"
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"github.com/prysmaticlabs/prysm/shared/params"
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)
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// RewardQuotient returns the reward quotient for validators which will be used to
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// reward validators for voting on blocks, or penalise them for being offline.
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func RewardQuotient(totalActiveValidatorDeposit uint64) uint64 {
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totalDepositETH := totalActiveValidatorDeposit / params.BeaconConfig().Gwei
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return params.BeaconConfig().BaseRewardQuotient * mathutil.IntegerSquareRoot(totalDepositETH)
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}
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// QuadraticPenaltyQuotient is the quotient that will be used to apply penalties to offline
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// validators.
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func QuadraticPenaltyQuotient() uint64 {
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dropTimeFactor := params.BeaconConfig().SqrtExpDropTime
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return dropTimeFactor * dropTimeFactor
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}
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// QuadraticPenalty returns the penalty that will be applied to an offline validator
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// based on the number of slots that they are offline.
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func QuadraticPenalty(numberOfSlots uint64) uint64 {
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slotFactor := (numberOfSlots * numberOfSlots) / 2
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penaltyQuotient := QuadraticPenaltyQuotient()
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return slotFactor / penaltyQuotient
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}
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// RewardValidatorCrosslink applies rewards to validators part of a shard committee for voting on a shard.
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// TODO(#538): Change this to big.Int as tests using 64 bit integers fail due to integer overflow.
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func RewardValidatorCrosslink(
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totalDeposit uint64,
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participatedDeposits uint64,
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rewardQuotient uint64,
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validator *pb.ValidatorRecord,
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) *pb.ValidatorRecord {
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currentBalance := int64(validator.Balance)
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currentBalance += int64(currentBalance) / int64(rewardQuotient) * (2*int64(participatedDeposits) - int64(totalDeposit)) / int64(totalDeposit)
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return &pb.ValidatorRecord{
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Pubkey: validator.Pubkey,
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RandaoCommitmentHash32: validator.RandaoCommitmentHash32,
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Balance: uint64(currentBalance),
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Status: validator.Status,
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LatestStatusChangeSlot: validator.LatestStatusChangeSlot,
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}
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}
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// PenaliseValidatorCrosslink applies penalties to validators part of a shard committee for not voting on a shard.
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func PenaliseValidatorCrosslink(
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timeSinceLastConfirmation uint64,
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rewardQuotient uint64,
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validator *pb.ValidatorRecord,
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) *pb.ValidatorRecord {
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newBalance := validator.Balance
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quadraticQuotient := QuadraticPenaltyQuotient()
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newBalance -= newBalance/rewardQuotient + newBalance*timeSinceLastConfirmation/quadraticQuotient
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return &pb.ValidatorRecord{
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Pubkey: validator.Pubkey,
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RandaoCommitmentHash32: validator.RandaoCommitmentHash32,
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Balance: uint64(newBalance),
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Status: validator.Status,
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LatestStatusChangeSlot: validator.LatestStatusChangeSlot,
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}
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}
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