Awesome
goczmq 
Introduction
A golang interface to the CZMQ v4.2 API.
Install
Dependencies
For CZMQ master
go get github.com/zeromq/goczmq
A Note on Build Tags
The CZMQ library includes experimental classes that are not built by default, but can be built
by passing --enable-drafts to configure. Support for these draft classes are being added
to goczmq. To build these features against a CZMQ that has been compiled with --enable-drafts,
use go build -tags draft.
For CMZQ = 4.2
go get gopkg.in/zeromq/goczmq.v4
Note: CZMQ 4.2 is has not been released yet.
For CZMQ Before 4.0
go get gopkg.in/zeromq/goczmq.v1
Usage
Direct CZMQ Sock API
Example
package main
import (
"log"
"github.com/zeromq/goczmq"
)
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'")
// Receive 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]))
}
Output
2015/05/26 21:52:52 router created and bound
2015/05/26 21:52:52 dealer created and connected
2015/05/26 21:52:52 dealer sent 'Hello'
2015/05/26 21:52:52 router received 'Hello' from '[0 103 84 189 175]'
2015/05/26 21:52:52 router sent 'World'
2015/05/26 21:52:52 dealer received 'World'
io.ReadWriter support
Example
package main
import (
"log"
"github.com/zeromq/goczmq"
)
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]))
}
Output
2015/05/26 21:54:10 router created and bound
2015/05/26 21:54:10 dealer created and connected
2015/05/26 21:54:10 dealer sent 5 byte message 'Hello'
2015/05/26 21:54:10 router received 'Hello'
2015/05/26 21:54:10 router sent 5 byte message 'World'
2015/05/26 21:54:10 dealer received 'World'
Thread safe channel interface
Example
package main
import (
"log"
"github.com/zeromq/goczmq"
)
func main() {
// Create a router channeler and bind it to port 5555.
// A channeler provides a thread safe channel interface
// to a *Sock
router := goczmq.NewRouterChanneler("tcp://*:5555")
defer router.Destroy()
log.Println("router created and bound")
// Create a dealer channeler and connect it to the router.
dealer := goczmq.NewDealerChanneler("tcp://127.0.0.1:5555")
defer dealer.Destroy()
log.Println("dealer created and connected")
// Send a 'Hello' message from the dealer to the router.
dealer.SendChan <- [][]byte{[]byte("Hello")}
log.Println("dealer sent 'Hello'")
// Receve the message as a [][]byte. Since this is
// a router, the first frame of the message wil
// be the routing frame.
request := <-router.RecvChan
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.
router.SendChan <- [][]byte{request[0], []byte("World")}
log.Printf("router sent 'World'")
// Receive the reply.
reply := <-dealer.RecvChan
log.Printf("dealer received '%s'", string(reply[0]))
}
Output
2015/05/26 21:56:43 router created and bound
2015/05/26 21:56:43 dealer created and connected
2015/05/26 21:56:43 dealer sent 'Hello'
2015/05/26 21:56:43 received 'Hello' from '[0 12 109 153 35]'
2015/05/26 21:56:43 router sent 'World'
2015/05/26 21:56:43 dealer received 'World'
GoDoc
See Also
- Peter Kleiweg's zmq4 bindings
License
This project uses the MPL v2 license, see LICENSE