mirror of
https://github.com/nspcc-dev/neo-go.git
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54d888ba70
This seriously improves the serialization/deserialization performance for several reasons: * no time spent in `binary` reflection * no memory allocations being made on every read/write * uses fast ReadBytes everywhere it's appropriate It also makes Fixed8 Serializable just for convenience.
99 lines
2.7 KiB
Go
99 lines
2.7 KiB
Go
package state
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import (
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"github.com/CityOfZion/neo-go/pkg/crypto/keys"
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"github.com/CityOfZion/neo-go/pkg/io"
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"github.com/CityOfZion/neo-go/pkg/util"
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)
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// Validator holds the state of a validator.
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type Validator struct {
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PublicKey *keys.PublicKey
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Registered bool
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Votes util.Fixed8
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}
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// RegisteredAndHasVotes returns true or false whether Validator is registered and has votes.
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func (vs *Validator) RegisteredAndHasVotes() bool {
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return vs.Registered && vs.Votes > util.Fixed8(0)
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}
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// EncodeBinary encodes Validator to the given BinWriter.
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func (vs *Validator) EncodeBinary(bw *io.BinWriter) {
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vs.PublicKey.EncodeBinary(bw)
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bw.WriteBool(vs.Registered)
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vs.Votes.EncodeBinary(bw)
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}
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// DecodeBinary decodes Validator from the given BinReader.
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func (vs *Validator) DecodeBinary(reader *io.BinReader) {
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vs.PublicKey = &keys.PublicKey{}
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vs.PublicKey.DecodeBinary(reader)
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vs.Registered = reader.ReadBool()
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vs.Votes.DecodeBinary(reader)
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}
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// GetValidatorsWeightedAverage applies weighted filter based on votes for validator and returns number of validators.
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// Get back to it with further investigation in https://github.com/nspcc-dev/neo-go/issues/512.
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func GetValidatorsWeightedAverage(validators []*Validator) int {
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return int(weightedAverage(applyWeightedFilter(validators)))
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}
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// applyWeightedFilter is an implementation of the filter for validators votes.
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// C# reference https://github.com/neo-project/neo/blob/41caff115c28d6c7665b2a7ac72967e7ce82e921/neo/Helper.cs#L273
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func applyWeightedFilter(validators []*Validator) map[*Validator]float64 {
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var validatorsWithVotes []*Validator
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var amount float64
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weightedVotes := make(map[*Validator]float64)
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start := 0.25
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end := 0.75
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sum := float64(0)
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current := float64(0)
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for _, validator := range validators {
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if validator.Votes > util.Fixed8(0) {
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validatorsWithVotes = append(validatorsWithVotes, validator)
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amount += validator.Votes.FloatValue()
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}
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}
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for _, validator := range validatorsWithVotes {
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if current >= end {
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break
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}
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weight := validator.Votes.FloatValue()
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sum += weight
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old := current
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current = sum / amount
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if current <= start {
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continue
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}
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if old < start {
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if current > end {
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weight = (end - start) * amount
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} else {
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weight = (current - start) * amount
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}
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} else if current > end {
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weight = (end - old) * amount
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}
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weightedVotes[validator] = weight
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}
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return weightedVotes
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}
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func weightedAverage(weightedVotes map[*Validator]float64) float64 {
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sumWeight := float64(0)
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sumValue := float64(0)
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for vState, weight := range weightedVotes {
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sumWeight += weight
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sumValue += vState.Votes.FloatValue() * weight
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}
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if sumValue == 0 || sumWeight == 0 {
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return 0
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}
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return sumValue / sumWeight
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}
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