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ballot.go
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ballot.go
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package types
import (
"fmt"
"math"
"sort"
"strconv"
sdk "github.com/cosmos/cosmos-sdk/types"
"github.com/NibiruChain/nibiru/x/common/asset"
)
// NOTE: we don't need to implement proto interface on this file
// these are not used in store or rpc response
// ExchangeRateBallot is a convenience wrapper to reduce redundant lookup cost
type ExchangeRateBallot struct {
Pair asset.Pair
ExchangeRate sdk.Dec // aka price
Voter sdk.ValAddress
Power int64 // how much tendermint consensus power this vote should have
}
// NewExchangeRateBallot returns a new ExchangeRateBallot instance
func NewExchangeRateBallot(rate sdk.Dec, pair asset.Pair, voter sdk.ValAddress, power int64) ExchangeRateBallot {
return ExchangeRateBallot{
ExchangeRate: rate,
Pair: pair,
Voter: voter,
Power: power,
}
}
// ExchangeRateBallots is a convenience wrapper around a ExchangeRateVote slice
type ExchangeRateBallots []ExchangeRateBallot
// ToMap return organized exchange rate map by validator
func (pb ExchangeRateBallots) ToMap() map[string]sdk.Dec {
validatorExchangeRateMap := make(map[string]sdk.Dec)
for _, vote := range pb {
if vote.ExchangeRate.IsPositive() {
validatorExchangeRateMap[string(vote.Voter)] = vote.ExchangeRate
}
}
return validatorExchangeRateMap
}
// ToCrossRate return cross_rate(base/exchange_rate) ballot
func (pb ExchangeRateBallots) ToCrossRate(bases map[string]sdk.Dec) (cb ExchangeRateBallots) {
for i := range pb {
vote := pb[i]
if exchangeRateRT, ok := bases[string(vote.Voter)]; ok && vote.ExchangeRate.IsPositive() {
vote.ExchangeRate = exchangeRateRT.Quo(vote.ExchangeRate)
} else {
// If we can't get reference exchange rate, we just convert the vote as abstain vote
vote.ExchangeRate = sdk.ZeroDec()
vote.Power = 0
}
cb = append(cb, vote)
}
return
}
// NumValidVoters returns the number of voters who actually voted (i.e. did not abstain from voting for a pair).
func (b ExchangeRateBallots) NumValidVoters() uint64 {
count := 0
for _, ballot := range b {
if ballot.ExchangeRate.IsPositive() {
count++
}
}
return uint64(count)
}
// Power returns the total amount of voting power in the ballot
func (b ExchangeRateBallots) Power() int64 {
totalPower := int64(0)
for _, vote := range b {
totalPower += vote.Power
}
return totalPower
}
// WeightedMedian returns the median weighted by the power of the ExchangeRateVote.
// CONTRACT: ballot must be sorted
func (pb ExchangeRateBallots) WeightedMedian() sdk.Dec {
totalPower := pb.Power()
if pb.Len() > 0 {
pivot := int64(0)
for _, v := range pb {
votePower := v.Power
pivot += votePower
if pivot >= (totalPower / 2) {
return v.ExchangeRate
}
}
}
return sdk.ZeroDec()
}
// WeightedMedianWithAssertion returns the median weighted by the power of the ExchangeRateVote.
func (pb ExchangeRateBallots) WeightedMedianWithAssertion() sdk.Dec {
sort.Sort(pb)
totalPower := pb.Power()
if pb.Len() > 0 {
pivot := int64(0)
for _, v := range pb {
votePower := v.Power
pivot += votePower
if pivot >= (totalPower / 2) {
return v.ExchangeRate
}
}
}
return sdk.ZeroDec()
}
// StandardDeviation returns the standard deviation by the power of the ExchangeRateVote.
func (pb ExchangeRateBallots) StandardDeviation(median sdk.Dec) (standardDeviation sdk.Dec) {
if len(pb) == 0 {
return sdk.ZeroDec()
}
defer func() {
if e := recover(); e != nil {
standardDeviation = sdk.ZeroDec()
}
}()
sum := sdk.ZeroDec()
n := 0
for _, v := range pb {
// ignore abstain votes in std dev calculation
if v.ExchangeRate.IsPositive() {
deviation := v.ExchangeRate.Sub(median)
sum = sum.Add(deviation.Mul(deviation))
n += 1
}
}
variance := sum.QuoInt64(int64(n))
floatNum, _ := strconv.ParseFloat(variance.String(), 64)
floatNum = math.Sqrt(floatNum)
standardDeviation, _ = sdk.NewDecFromStr(fmt.Sprintf("%f", floatNum))
return
}
// Len implements sort.Interface
func (pb ExchangeRateBallots) Len() int {
return len(pb)
}
// Less reports whether the element with
// index i should sort before the element with index j.
func (pb ExchangeRateBallots) Less(i, j int) bool {
return pb[i].ExchangeRate.LT(pb[j].ExchangeRate)
}
// Swap implements sort.Interface.
func (pb ExchangeRateBallots) Swap(i, j int) {
pb[i], pb[j] = pb[j], pb[i]
}
// ValidatorPerformance keeps track of a validator performance in the voting period.
type ValidatorPerformance struct {
Power int64 // tendermint consensus power
RewardWeight int64 // how much of the rewards this validator should receive, units of consensus power
WinCount int64
ValAddress sdk.ValAddress
}
// NewValidatorPerformance generates a ValidatorPerformance instance.
func NewValidatorPerformance(power int64, recipient sdk.ValAddress) ValidatorPerformance {
return ValidatorPerformance{
Power: power,
RewardWeight: 0,
WinCount: 0,
ValAddress: recipient,
}
}
type ValidatorPerformances map[string]ValidatorPerformance
// GetTotalRewardWeight returns the sum of the reward weight of all the validators included in the map
func (vp ValidatorPerformances) GetTotalRewardWeight() int64 {
totalRewardWeight := int64(0)
for _, validator := range vp {
totalRewardWeight += validator.RewardWeight
}
return totalRewardWeight
}