func NewSubscriber(ctx context.Context, url string) (*Subscriber, error) {
var sock mangos.Socket
var err error
sock, err = sub.NewSocket()
if err != nil {
return nil, err
}
sock.AddTransport(ipc.NewTransport())
sock.AddTransport(tcp.NewTransport())
err = sock.Dial(url)
if err != nil {
return nil, err
}
// subscribes to everything
err = sock.SetOption(mangos.OptionSubscribe, []byte(""))
if err != nil {
return nil, err
}
subscriber := &Subscriber{
url: url,
ctx: ctx,
sock: sock,
changes: make(chan []string, 8),
}
go subscriber.run()
return subscriber, nil
}
func server(url string, nworkers int) {
var sock mangos.Socket
var err error
var wg sync.WaitGroup
rand.Seed(time.Now().UnixNano())
if sock, err = rep.NewSocket(); err != nil {
die("can't get new rep socket: %s", err)
}
if err = sock.SetOption(mangos.OptionRaw, true); err != nil {
die("can't set raw mode: %s", err)
}
sock.AddTransport(ipc.NewTransport())
sock.AddTransport(tcp.NewTransport())
if err = sock.Listen(url); err != nil {
die("can't listen on rep socket: %s", err.Error())
}
wg.Add(nworkers)
fmt.Printf("Starting %d workers\n", nworkers)
for id := 0; id < nworkers; id++ {
go func(id int) {
defer wg.Done()
serverWorker(sock, id)
}(id)
}
wg.Wait()
}
func client(url string, name string) {
var sock mangos.Socket
var err error
var msg []byte
if sock, err = sub.NewSocket(); err != nil {
die("can't get new sub socket: %s", err.Error())
}
sock.AddTransport(ipc.NewTransport())
sock.AddTransport(tcp.NewTransport())
if err = sock.Dial(url); err != nil {
die("can't dial on sub socket: %s", err.Error())
}
// Empty byte array effectively subscribes to everything
err = sock.SetOption(mangos.OptionSubscribe, []byte(""))
if err != nil {
die("cannot subscribe: %s", err.Error())
}
for {
if msg, err = sock.Recv(); err != nil {
die("Cannot recv: %s", err.Error())
}
fmt.Printf("CLIENT(%s): RECEIVED %s\n", name, string(msg))
}
}
func server(url string) {
var sock mangos.Socket
var err error
var msg []byte
if sock, err = surveyor.NewSocket(); err != nil {
die("can't get new surveyor socket: %s", err)
}
sock.AddTransport(ipc.NewTransport())
sock.AddTransport(tcp.NewTransport())
if err = sock.Listen(url); err != nil {
die("can't listen on surveyor socket: %s", err.Error())
}
err = sock.SetOption(mangos.OptionSurveyTime, time.Second*2)
if err != nil {
die("SetOption(): %s", err.Error())
}
for {
fmt.Println("SERVER: SENDING DATE SURVEY REQUEST")
if err = sock.Send([]byte("DATE")); err != nil {
die("Failed sending survey: %s", err.Error())
}
for {
if msg, err = sock.Recv(); err != nil {
break
}
fmt.Printf("SERVER: RECEIVED \"%s\" SURVEY RESPONSE\n",
string(msg))
}
}
}
func send_recv(sock mangos.Socket, name string) {
for {
sock.SetOption(mangos.OptionRecvDeadline, 100*time.Millisecond)
recv_name(sock, name)
time.Sleep(time.Second)
send_name(sock, name)
}
}
func main() {
flag.Parse()
var sock mangos.Socket
var err error
if sock, err = pub.NewSocket(); err != nil {
die("can't get new pub socket: %s", err)
}
sock.AddTransport(ipc.NewTransport())
sock.AddTransport(tcp.NewTransport())
if err = sock.Listen("tcp://127.0.0.1:55555"); err != nil {
die("can't listen on pub socket: %s", err.Error())
}
//sub
var subscriber mangos.Socket
if subscriber, err = sub.NewSocket(); err != nil {
die("can't get new sub socket: %s", err.Error())
}
subscriber.AddTransport(ipc.NewTransport())
subscriber.AddTransport(tcp.NewTransport())
if err = subscriber.Dial("tcp://127.0.0.1:55555"); err != nil {
die("can't dial on sub socket: %s", err.Error())
}
// Empty byte array effectively subscribes to everything
err = subscriber.SetOption(mangos.OptionSubscribe, []byte(""))
start := time.Now()
//var msg []byte
for i := 1; i <= *numbPtr; i++ {
//conn.Publish("test", []byte(randSeq(320)))
sock.Send([]byte(randSeq(320)))
if _, err = subscriber.Recv(); err != nil {
die("Cannot recv: %s", err.Error())
}
//log.Println(string(msg))
/*
runtime.Gosched()
atomic.AddUint64(&ops, 1)
if ops == uint64(*numbPtr) {
elapsed := time.Since(start)
log.Printf("Time took %s", elapsed)
}
*/
}
elapsed := time.Since(start)
log.Printf("Time took %s", elapsed)
defer sock.Close()
fmt.Scanln()
}
func Server(urlServer string, urlPubSub string, opt Options) (*DiscoveryServer, error) {
var sock mangos.Socket
var err error
var publisher *Publisher
ctx, cancel := context.WithCancel(context.Background())
sock, err = surveyor.NewSocket()
if err != nil {
return nil, err
}
sock.AddTransport(ipc.NewTransport())
sock.AddTransport(tcp.NewTransport())
err = sock.Listen(urlServer)
if err != nil {
return nil, err
}
err = sock.SetOption(mangos.OptionSurveyTime, opt.SurveyTime)
if err != nil {
return nil, err
}
err = sock.SetOption(mangos.OptionRecvDeadline, opt.RecvDeadline)
if err != nil {
return nil, err
}
pubCtx, pubCancel := context.WithCancel(ctx)
publisher, err = NewPublisher(pubCtx, urlPubSub)
if err != nil {
pubCancel()
return nil, err
}
services := NewServices(publisher)
server := &DiscoveryServer{
services: services,
urlServer: urlServer,
urlPubSub: urlPubSub,
opt: opt,
ctx: ctx,
cancel: cancel,
sock: sock,
}
go server.run()
return server, nil
}
func main() {
how_rand := flag.Bool("rand", false, "")
flag.Parse()
if flag.NArg() < 1 {
log.Fatal("Missing arguments: at least one endpoint to bind to")
}
var err error
var out mangos.Socket
if out, err = push.NewSocket(); err != nil {
log.Fatal("Nanomsg socket creation failure: ", err)
} else {
defer out.Close()
out.AddTransport(ipc.NewTransport())
out.AddTransport(tcp.NewTransport())
out.SetOption(mangos.OptionWriteQLen, 16)
out.SetOption(mangos.OptionRetryTime, 0)
for i := 0; i < flag.NArg(); i++ {
if err := out.Listen(flag.Arg(i)); err != nil {
log.Fatal("Nanomsg listen() error: ", err)
}
}
}
switch {
case *how_rand:
Gen(out, func(tab []string) string {
if len(tab) <= 0 {
return ""
}
return tab[rand.Intn(len(tab))]
})
default:
i := 0
Gen(out, func(tab []string) string {
if len(tab) <= 0 {
return ""
}
i = (i + 1) % len(tab)
return tab[i]
})
}
}
func sendRecvLoop(sock mangos.Socket) {
for {
msg := mangos.NewMessage(len(sendData))
msg.Body = append(msg.Body, sendData...)
err := sock.SendMsg(msg)
if err != nil {
fatalf("SendMsg failed: %v", err)
}
if sendInterval < 0 {
recvLoop(sock)
return
}
now := time.Now()
// maximum wait time is upper bound of recvTimeout and
// sendInterval
if recvTimeout < 0 || recvTimeout > sendInterval {
sock.SetOption(mangos.OptionRecvDeadline,
time.Second*time.Duration(sendInterval))
}
msg, err = sock.RecvMsg()
switch err {
case mangos.ErrRecvTimeout:
case nil:
printMsg(msg)
msg.Free()
default:
fatalf("RecvMsg failed: %v", err)
}
time.Sleep((time.Second * time.Duration(sendInterval)) -
time.Now().Sub(now))
}
}
func (m *Master) queryWorkers(c chan<- float64) {
var (
err error
sock mangos.Socket
)
// Try to get new "surveyor" socket
if sock, err = surveyor.NewSocket(); err != nil {
utils.Die("Can't get new surveyor socket: %s", err)
}
defer sock.Close()
sock.AddTransport(tcp.NewTransport())
// Begin listening on the URL
if err = sock.Listen(m.url.String()); err != nil {
utils.Die("Can't listen on surveyor socket: %s", err.Error())
}
// Set "deadline" for the survey and a timeout for receiving responses
if err = sock.SetOption(mangos.OptionSurveyTime, m.surveyDeadline); err != nil {
utils.Die("SetOption(mangos.OptionSurveyTime): %s", err.Error())
}
if err = sock.SetOption(mangos.OptionRecvDeadline, m.surveyDeadline+(1*time.Second)); err != nil {
utils.Die("SetOption(mangos.OptionRecvDeadline): %s", err.Error())
}
for {
fmt.Println("Sending master request")
if err = sock.Send([]byte("CPU")); err != nil {
utils.Die("Failed sending survey: %s", err.Error())
}
loadAvgs := []float64{}
for {
var msg []byte
if msg, err = sock.Recv(); err != nil {
break
}
parts := strings.Split(string(msg), ",")
if len(parts) != 2 {
continue
}
ip := parts[0]
loadAvgString := parts[1]
// Find the corresponding droplet
var worker *Worker
for _, w := range m.workers {
if w.privateAddr == ip {
worker = w
break
}
}
if worker == nil {
fmt.Printf("Message received from unknown worker '%s'. Skipping...\n", ip)
continue
}
var loadAvg float64
if loadAvg, err = strconv.ParseFloat(string(loadAvgString), 64); err != nil {
utils.Die("ParseFloat(): %s", err.Error())
}
// Set their load average and append this worker's load average to the list
worker.loadAvg = loadAvg
loadAvgs = append(loadAvgs, loadAvg)
}
// Compute the average loadAvg
var loadAvg float64
for _, avg := range loadAvgs {
loadAvg += avg
}
loadAvg /= float64(len(loadAvgs))
// Send the load averages
if !math.IsNaN(loadAvg) {
c <- loadAvg
}
// Wait
time.Sleep(m.queryInterval)
}
}
