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|
package quorum
import (
"context"
"log"
"sort"
"strconv"
"strings"
"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
}
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, <-chan string) {
voteCh := make(chan vote.Vote)
scoreCh := make(chan string)
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(voteCh)
defer close(scoreCh)
var (
myVote vote.Vote
changed bool
)
for {
select {
case <-time.After(interval):
myVote, _ = quo.makeMyVote()
log.Println("quorum: made my vote:", myVote)
voteCh <- myVote
case v := <-quo.voteCh:
quo.vote(v)
if myVote, changed = quo.makeMyVote(); changed {
log.Println("quorum: changed my vote:", myVote)
voteCh <- myVote
scoreCh <- quo.strs()
}
case <-ctx.Done():
return
}
}
}()
return voteCh, scoreCh
}
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) scores() (scores Scores) {
scoreMap := make(map[string]int)
for _, vote := range quo.votes {
if vote.Expired() {
continue
}
for _, id := range vote.IDs {
score := scoreMap[id]
priority, err := quo.conf.NodePriority(id)
if err != nil {
log.Println(err)
scoreMap[id] = score
continue
}
scoreMap[id] = 10*score + priority
}
}
for id, score_ := range scoreMap {
scores = append(scores, Score{id, score_, time.Now()})
}
sort.Slice(scores, func(i, j int) bool {
return scores[i].Value > scores[j].Value
})
return
}
func (quo *Quorum) strs() string {
scores := quo.scores()
log.Println("quorum scores:", scores)
winner, err := scores.Winner()
if err != nil {
log.Println("the winner is", winner.ID)
}
var sb strings.Builder
for i, score := range scores {
sb.WriteString("At position ")
sb.WriteString(strconv.Itoa(i + 1))
if score.ID == quo.conf.MyID {
sb.WriteString(" is current node ")
} else {
sb.WriteString(" is partner node ")
}
sb.WriteString(score.ID)
sb.WriteString(" (priority ")
priority, _ := quo.conf.NodePriority(score.ID)
sb.WriteString(strconv.Itoa(priority))
sb.WriteString(") with total score of ")
sb.WriteString(strconv.Itoa(score.Value))
sb.WriteString("\n")
}
return sb.String()
}
func (quo *Quorum) makeMyVote() (vote.Vote, bool) {
newVote, err := quo.expireOldVotes()
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) expireOldVotes() (vote.Vote, error) {
var expired []string
var live []string
for fromNode, vote := range quo.votes {
if vote.Expired() {
log.Println("quorum: vote", vote, "from node", fromNode, "expired!")
expired = append(expired, fromNode)
continue
}
live = append(live, fromNode)
}
for _, e := range expired {
delete(quo.votes, e)
}
return vote.New(quo.conf, live...)
}
|
