/
zmq.go
106 lines (79 loc) · 1.85 KB
/
zmq.go
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package glc
import (
zmq "github.com/pebbe/zmq4"
"log"
"time"
)
type GlcZmq struct {
Socket *zmq.Socket
}
func BindProxy(frontend string, backend string) {
context, err := zmq.NewContext()
if err != nil {
log.Fatal(err)
}
// create XSUB for publishers to connect to
xSub, _ := context.NewSocket(zmq.XSUB)
defer xSub.Close()
err = xSub.Bind(frontend)
if err != nil {
log.Fatal(err)
}
// create XPUB for subscribers to connect to
xPub, _ := context.NewSocket(zmq.XPUB)
defer xPub.Close()
err = xPub.Bind(backend)
if err != nil {
log.Fatal(err)
}
err = zmq.Proxy(xSub, xPub, nil)
log.Fatalln("Proxy interrupted:", err)
}
func BindPublisher(endpoint string) *GlcZmq {
context, err := zmq.NewContext()
if err != nil {
log.Fatal(err)
}
socket, err := context.NewSocket(zmq.PUB)
if err != nil {
log.Fatal(err)
}
go func(socket *zmq.Socket, endpoint string) {
defer socket.Close()
err = socket.Connect(endpoint)
if err != nil {
log.Fatal(err)
}
for {
time.Sleep(1 * time.Second)
}
}(socket, endpoint)
return &GlcZmq{socket}
}
func BindSubscriber(endpoint string, filter string, callback func(message string)) *GlcZmq {
context, err := zmq.NewContext()
socket, err := context.NewSocket(zmq.PUB)
defer socket.Close()
if err != nil {
log.Fatal(err)
}
err = socket.Connect(endpoint)
if err != nil {
log.Fatal(err)
}
for {
msg, _ := socket.Recv(zmq.DONTWAIT)
if msg != "" {
callback(msg)
}
}
return &GlcZmq{socket}
}
func PublishMessage(message string, glcZqm *GlcZmq) {
glcZqm.Socket.Send(message, zmq.DONTWAIT)
}
// Publish with a topic so that filtering can be done
func PublishMessageWithTopic(topic string, message string, glcZqm *GlcZmq) {
glcZqm.Socket.Send(topic, zmq.SNDMORE)
glcZqm.Socket.Send(message, zmq.DONTWAIT)
}