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package main
import (
"flag"
"fmt"
"log"
"os"
"strings"
"sync/atomic"
"time"
"github.com/hashicorp/memberlist"
)
type Delegate struct {
Value int32
Port int
}
func (d *Delegate) NodeMeta(limit int) []byte {
log.Printf("NodeMeta called")
return []byte(fmt.Sprintf("localhost:%d:%d", d.Port, atomic.LoadInt32(&d.Value)))
}
func (d Delegate) NotifyMsg([]byte) {
log.Printf("NotifyMsg called")
}
func (d Delegate) GetBroadcasts(overhead, limit int) [][]byte {
return nil
}
func (d Delegate) LocalState(join bool) []byte {
log.Printf("LocalState called")
return []byte(fmt.Sprintf("port=%d", d.Port))
}
func (d Delegate) MergeRemoteState(buf []byte, join bool) {
log.Printf("MergeRemoteState called")
}
func main() {
listenPort := flag.Int("port", 0, "listening port")
bootstrapAddr := flag.String("join", "", "list of addresses to join")
flag.Parse()
hostname, err := os.Hostname()
if err != nil {
log.Fatalf("get hostname: %q", err)
}
cfg := memberlist.DefaultLocalConfig()
delegate := &Delegate{Port: *listenPort}
cfg.Delegate = delegate
cfg.Name = fmt.Sprintf("%s:%d", hostname, *listenPort)
cfg.BindAddr = "127.0.0.1"
cfg.BindPort = *listenPort
cfg.AdvertiseAddr = cfg.BindAddr
cfg.AdvertisePort = cfg.BindPort
list, err := memberlist.Create(cfg)
if err != nil {
log.Fatalf("create list: %q", err)
}
if *bootstrapAddr != "" {
if _, err := list.Join(strings.Split(*bootstrapAddr, ",")); err != nil {
log.Fatal("join: %q", err)
}
}
for range time.NewTicker(5 * time.Second).C {
for _, member := range list.Members() {
log.Printf("%q: %q", member.Name, member.Meta)
}
list.UpdateNode(time.Second)
atomic.AddInt32(&delegate.Value, 1)
}
}
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