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250 lines
7.0 KiB
250 lines
7.0 KiB
package state
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import (
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"bytes"
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"fmt"
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"sort"
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"strings"
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. "github.com/tendermint/tendermint/common"
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"github.com/tendermint/tendermint/merkle"
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)
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// ValidatorSet represent a set of *Validator at a given height.
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// The validators can be fetched by address or index.
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// The index is in order of .Address, so the indices are fixed
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// for all rounds of a given blockchain height.
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// On the other hand, the .AccumPower of each validator and
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// the designated .Proposer() of a set changes every round,
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// upon calling .IncrementAccum().
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// NOTE: Not goroutine-safe.
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// NOTE: All get/set to validators should copy the value for safety.
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// TODO: consider validator Accum overflow
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// TODO: replace validators []*Validator with github.com/jaekwon/go-ibbs?
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type ValidatorSet struct {
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Validators []*Validator // NOTE: persisted via reflect, must be exported.
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// cached (unexported)
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proposer *Validator
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totalVotingPower uint64
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}
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func NewValidatorSet(vals []*Validator) *ValidatorSet {
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validators := make([]*Validator, len(vals))
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for i, val := range vals {
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validators[i] = val.Copy()
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}
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sort.Sort(ValidatorsByAddress(validators))
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return &ValidatorSet{
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Validators: validators,
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}
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}
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// TODO: mind the overflow when times and votingPower shares too large.
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func (valSet *ValidatorSet) IncrementAccum(times uint) {
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// Add VotingPower * times to each validator and order into heap.
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validatorsHeap := NewHeap()
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for _, val := range valSet.Validators {
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val.Accum += int64(val.VotingPower) * int64(times) // TODO: mind overflow
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validatorsHeap.Push(val, accumComparable(val.Accum))
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}
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// Decrement the validator with most accum, times times.
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for i := uint(0); i < times; i++ {
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mostest := validatorsHeap.Peek().(*Validator)
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mostest.Accum -= int64(valSet.TotalVotingPower())
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validatorsHeap.Update(mostest, accumComparable(mostest.Accum))
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}
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// The next proposer is the next most accums remaining
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valSet.proposer = validatorsHeap.Peek().(*Validator)
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}
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func (valSet *ValidatorSet) Copy() *ValidatorSet {
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validators := make([]*Validator, len(valSet.Validators))
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for i, val := range valSet.Validators {
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// NOTE: must copy, since IncrementAccum updates in place.
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validators[i] = val.Copy()
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}
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return &ValidatorSet{
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Validators: validators,
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proposer: valSet.proposer,
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totalVotingPower: valSet.totalVotingPower,
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}
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}
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func (valSet *ValidatorSet) HasAddress(address []byte) bool {
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idx := sort.Search(len(valSet.Validators), func(i int) bool {
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return bytes.Compare(address, valSet.Validators[i].Address) <= 0
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})
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return idx != len(valSet.Validators) && bytes.Compare(valSet.Validators[idx].Address, address) == 0
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}
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func (valSet *ValidatorSet) GetByAddress(address []byte) (index uint, val *Validator) {
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idx := sort.Search(len(valSet.Validators), func(i int) bool {
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return bytes.Compare(address, valSet.Validators[i].Address) <= 0
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})
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if idx != len(valSet.Validators) && bytes.Compare(valSet.Validators[idx].Address, address) == 0 {
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return uint(idx), valSet.Validators[idx].Copy()
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} else {
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return 0, nil
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}
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}
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func (valSet *ValidatorSet) GetByIndex(index uint) (address []byte, val *Validator) {
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val = valSet.Validators[index]
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return val.Address, val.Copy()
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}
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func (valSet *ValidatorSet) Size() uint {
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return uint(len(valSet.Validators))
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}
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func (valSet *ValidatorSet) TotalVotingPower() uint64 {
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if valSet.totalVotingPower == 0 {
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for _, val := range valSet.Validators {
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valSet.totalVotingPower += val.VotingPower
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}
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}
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return valSet.totalVotingPower
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}
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func (valSet *ValidatorSet) Proposer() (proposer *Validator) {
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if valSet.proposer == nil {
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for _, val := range valSet.Validators {
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valSet.proposer = valSet.proposer.CompareAccum(val)
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}
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}
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return valSet.proposer.Copy()
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}
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func (valSet *ValidatorSet) Hash() []byte {
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if len(valSet.Validators) == 0 {
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return nil
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}
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hashables := make([]merkle.Hashable, len(valSet.Validators))
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for i, val := range valSet.Validators {
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hashables[i] = val
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}
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return merkle.HashFromHashables(hashables)
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}
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func (valSet *ValidatorSet) Add(val *Validator) (added bool) {
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val = val.Copy()
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idx := sort.Search(len(valSet.Validators), func(i int) bool {
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return bytes.Compare(val.Address, valSet.Validators[i].Address) <= 0
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})
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if idx == len(valSet.Validators) {
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valSet.Validators = append(valSet.Validators, val)
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// Invalidate cache
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valSet.proposer = nil
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valSet.totalVotingPower = 0
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return true
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} else if bytes.Compare(valSet.Validators[idx].Address, val.Address) == 0 {
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return false
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} else {
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newValidators := make([]*Validator, len(valSet.Validators)+1)
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copy(newValidators[:idx], valSet.Validators[:idx])
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newValidators[idx] = val
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copy(newValidators[idx+1:], valSet.Validators[idx:])
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valSet.Validators = newValidators
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// Invalidate cache
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valSet.proposer = nil
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valSet.totalVotingPower = 0
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return true
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}
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}
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func (valSet *ValidatorSet) Update(val *Validator) (updated bool) {
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index, sameVal := valSet.GetByAddress(val.Address)
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if sameVal == nil {
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return false
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} else {
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valSet.Validators[index] = val.Copy()
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// Invalidate cache
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valSet.proposer = nil
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valSet.totalVotingPower = 0
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return true
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}
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}
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func (valSet *ValidatorSet) Remove(address []byte) (val *Validator, removed bool) {
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idx := sort.Search(len(valSet.Validators), func(i int) bool {
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return bytes.Compare(address, valSet.Validators[i].Address) <= 0
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})
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if idx == len(valSet.Validators) || bytes.Compare(valSet.Validators[idx].Address, address) != 0 {
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return nil, false
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} else {
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removedVal := valSet.Validators[idx]
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newValidators := valSet.Validators[:idx]
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if idx+1 < len(valSet.Validators) {
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newValidators = append(newValidators, valSet.Validators[idx+1:]...)
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}
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valSet.Validators = newValidators
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// Invalidate cache
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valSet.proposer = nil
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valSet.totalVotingPower = 0
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return removedVal, true
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}
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}
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func (valSet *ValidatorSet) Iterate(fn func(index uint, val *Validator) bool) {
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for i, val := range valSet.Validators {
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stop := fn(uint(i), val.Copy())
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if stop {
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break
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}
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}
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}
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func (valSet *ValidatorSet) String() string {
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return valSet.StringIndented("")
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}
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func (valSet *ValidatorSet) StringIndented(indent string) string {
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valStrings := []string{}
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valSet.Iterate(func(index uint, val *Validator) bool {
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valStrings = append(valStrings, val.String())
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return false
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})
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return fmt.Sprintf(`ValidatorSet{
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%s Proposer: %v
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%s Validators:
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%s %v
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%s}`,
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indent, valSet.Proposer().String(),
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indent,
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indent, strings.Join(valStrings, "\n"+indent+" "),
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indent)
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}
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//-------------------------------------
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// Implements sort for sorting validators by address.
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type ValidatorsByAddress []*Validator
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func (vs ValidatorsByAddress) Len() int {
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return len(vs)
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}
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func (vs ValidatorsByAddress) Less(i, j int) bool {
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return bytes.Compare(vs[i].Address, vs[j].Address) == -1
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}
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func (vs ValidatorsByAddress) Swap(i, j int) {
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it := vs[i]
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vs[i] = vs[j]
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vs[j] = it
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}
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//-------------------------------------
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// Use with Heap for sorting validators by accum
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type accumComparable uint64
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// We want to find the validator with the greatest accum.
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func (ac accumComparable) Less(o interface{}) bool {
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return uint64(ac) > uint64(o.(accumComparable))
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}
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