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package quorum
import (
"context"
"log"
"sort"
"time"
"codeberg.org/snonux/gorum/internal/config"
"codeberg.org/snonux/gorum/internal/vote"
)
type Quorum struct {
conf config.Config
// My own vote, sending to the partners
myVote vote.Vote
// From partners received votes
voteCh chan vote.Vote
votes map[string]vote.Vote
}
type Score struct {
ID string
Value int
}
func New(conf config.Config) Quorum {
return Quorum{
conf: conf,
votes: make(map[string]vote.Vote),
voteCh: make(chan vote.Vote),
}
}
func (quo Quorum) Start(ctx context.Context) <-chan vote.Vote {
ch := make(chan vote.Vote)
interval := time.Second * time.Duration(quo.conf.LoopIntervalS)
if vote.Expiry <= interval {
log.Fatal("quorum: LoopIntervalS ", quo.conf.LoopIntervalS,
" should be less than the vote expiry of ", vote.Expiry)
}
go func() {
defer close(ch)
for {
select {
case <-time.After(interval):
myVote, _ := quo.makeMyVote()
log.Println("quorum: made my vote:", myVote)
ch <- myVote
case v := <-quo.voteCh:
quo.vote(v)
if myVote, changed := quo.makeMyVote(); changed {
log.Println("quorum: changed my vote:", myVote)
ch <- myVote
}
quo.score()
case <-ctx.Done():
return
}
}
}()
return ch
}
func (quo Quorum) Vote(v vote.Vote) {
log.Printf("quorum: queing vote %v", v)
quo.voteCh <- v
}
func (quo Quorum) vote(v vote.Vote) {
log.Printf("quorum: adding vote %v", v)
quo.votes[v.FromID] = v
}
func (quo Quorum) score() (scores []Score) {
scoreMap := make(map[string]int)
for _, vote := range quo.votes {
if vote.Expired() {
continue
}
for _, id := range vote.IDs {
score := scoreMap[id]
scoreMap[id] = score + 1
}
}
for id, score_ := range scoreMap {
scores = append(scores, Score{id, score_})
}
sort.Slice(scores, func(i, j int) bool {
if scores[i].Value != scores[j].Value {
return scores[i].Value > scores[j].Value
}
// Score tie, use node number.
i_, _ := quo.conf.NodeNumber(scores[i].ID)
j_, _ := quo.conf.NodeNumber(scores[j].ID)
return i_ < j_
})
log.Println("quorum: scores are ", scores)
return
}
func (quo *Quorum) makeMyVote() (vote.Vote, bool) {
newVote, err := quo.pruneVotes()
if err != nil {
log.Println("quorum:", err)
return quo.myVote, false
}
if quo.myVote.Equal(newVote) {
return quo.myVote, false
}
quo.myVote = newVote
return quo.myVote, true
}
func (quo Quorum) pruneVotes() (vote.Vote, error) {
var expired []string
var live []string
for fromNode, vote := range quo.votes {
if vote.Expired() {
expired = append(expired, fromNode)
continue
}
live = append(live, fromNode)
}
for _, e := range expired {
delete(quo.votes, e)
}
return vote.New(quo.conf, live)
}
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