func main() {
// Create a router socket and bind it to port 5555.
router, err := goczmq.NewRouter("tcp://*:5555")
if err != nil {
log.Fatal(err)
}
defer router.Destroy()
log.Println("router created and bound")
// Create a dealer socket and connect it to the router.
dealer, err := goczmq.NewDealer("tcp://127.0.0.1:5555")
if err != nil {
log.Fatal(err)
}
defer dealer.Destroy()
log.Println("dealer created and connected")
// Send a 'Hello' message from the dealer to the router,
// using the io.Write interface
n, err := dealer.Write([]byte("Hello"))
if err != nil {
log.Fatal(err)
}
log.Printf("dealer sent %d byte message 'Hello'\n", n)
// Make a byte slice and pass it to the router
// Read interface. When using the ReadWriter
// interface with a router socket, the router
// caches the routing frames internally in a
// FIFO and uses them transparently when
// sending replies.
buf := make([]byte, 16386)
n, err = router.Read(buf)
if err != nil {
log.Fatal(err)
}
log.Printf("router received '%s'\n", buf[:n])
// Send a reply.
n, err = router.Write([]byte("World"))
if err != nil {
log.Fatal(err)
}
log.Printf("router sent %d byte message 'World'\n", n)
// Receive the reply, reusing the previous buffer.
n, err = dealer.Read(buf)
if err != nil {
log.Fatal(err)
}
log.Printf("dealer received '%s'", string(buf[:n]))
}
//Initialization of package, setup up log, server url, timeout
//return an error if goczmq.NewDealer return any errors
func (c *Communications) Init(_Log *log.Log, config *cfg.Cfg) error {
Log = _Log
Log.Print(log.LogLevelTrace, "Enter to com.Init")
url := "tcp://" + config.BAcfg.MessageServerAddress + ":" + config.BAcfg.MessageServerPort
c.dealer, err = goczmq.NewDealer(url)
c.dealer.SetRcvtimeo(config.BAcfg.TimeoutForResponse)
if err != nil {
Log.Print(log.LogLevelError, "Error creating NewDealer: ")
return err
}
// Create a router socket and bind it to port.
endpoint := "tcp://*:" + config.BAcfg.MessageServerPort
Log.Print(log.LogLevelTrace, "Creating endpoint: ", endpoint)
c.router, err = goczmq.NewRouter(endpoint)
if err != nil {
Log.Print(log.LogLevelError, "Error creating NewRouter: ")
return err
}
return err
}
func main() {
// Create a router socket and bind it to port 5555.
router, err := goczmq.NewRouter("tcp://*:5555")
if err != nil {
log.Fatal(err)
}
defer router.Destroy()
log.Println("router created and bound")
// Create a dealer socket and connect it to the router.
dealer, err := goczmq.NewDealer("tcp://127.0.0.1:5555")
if err != nil {
log.Fatal(err)
}
defer dealer.Destroy()
log.Println("dealer created and connected")
// Send a 'Hello' message from the dealer to the router.
// Here we send it as a frame ([]byte), with a FlagNone
// flag to indicate there are no more frames following.
err = dealer.SendFrame([]byte("Hello"), goczmq.FlagNone)
if err != nil {
log.Fatal(err)
}
log.Println("dealer sent 'Hello'")
// Receve the message. Here we call RecvMessage, which
// will return the message as a slice of frames ([][]byte).
// Since this is a router socket that support async
// request / reply, the first frame of the message will
// be the routing frame.
request, err := router.RecvMessage()
if err != nil {
log.Fatal(err)
}
log.Printf("router received '%s' from '%v'", request[1], request[0])
// Send a reply. First we send the routing frame, which
// lets the dealer know which client to send the message.
// The FlagMore flag tells the router there will be more
// frames in this message.
err = router.SendFrame(request[0], goczmq.FlagMore)
if err != nil {
log.Fatal(err)
}
log.Printf("router sent 'World'")
// Next send the reply. The FlagNone flag tells the router
// that this is the last frame of the message.
err = router.SendFrame([]byte("World"), goczmq.FlagNone)
if err != nil {
log.Fatal(err)
}
// Receive the reply.
reply, err := dealer.RecvMessage()
if err != nil {
log.Fatal(err)
}
log.Printf("dealer received '%s'", string(reply[0]))
}