forked from pebbe/zmq2
/
zmq2.go
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/
zmq2.go
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// A Go interface to ZeroMQ version 2.
//
// For ZeroMQ version 3, see: http://github.com/pebbe/zmq3
//
// Requires ZeroMQ version 2.1 or 2.2
//
// The following functions return ErrorNotImplemented in 0MQ version 2.1:
//
// (*Socket)GetRcvtimeo, (*Socket)GetSndtimeo, (*Socket)SetRcvtimeo, (*Socket)SetSndtimeo
//
// http://www.zeromq.org/
package zmq2
/*
#cgo !windows pkg-config: libzmq
#cgo windows CFLAGS: -I/usr/local/include
#cgo windows LDFLAGS: -L/usr/local/lib -lzmq
#include <zmq.h>
#include "zmq2.h"
#include <stdlib.h>
#include <string.h>
void my_free (void *data, void *hint) {
free (data);
}
int my_msg_init_data (zmq_msg_t *msg, void *data, size_t size) {
return zmq_msg_init_data (msg, data, size, my_free, NULL);
}
*/
import "C"
import (
"errors"
"runtime"
"strings"
"syscall"
"unsafe"
)
var (
ErrorNotImplemented = errors.New("Not implemented, requires 0MQ version 2.2")
)
var (
ctx unsafe.Pointer
nr_of_threads int
)
func init() {
var err error
nr_of_threads = 1
ctx, err = C.zmq_init(C.int(nr_of_threads))
if ctx == nil {
panic("Init of ZeroMQ context failed: " + errget(err).Error())
}
}
//. Util
func errget(err error) error {
errno, ok := err.(syscall.Errno)
if ok && errno >= C.ZMQ_HAUSNUMERO {
return errors.New(C.GoString(C.zmq_strerror(C.int(errno))))
}
return err
}
// Report 0MQ library version.
func Version() (major, minor, patch int) {
var maj, min, pat C.int
C.zmq_version(&maj, &min, &pat)
return int(maj), int(min), int(pat)
}
// Get 0MQ error message string.
func Error(e int) string {
return C.GoString(C.zmq_strerror(C.int(e)))
}
//. Context
// Returns the size of the 0MQ thread pool.
func GetIoThreads() (int, error) {
return nr_of_threads, nil
}
/*
This function specifies the size of the ØMQ thread pool to handle I/O operations.
If your application is using only the inproc transport for messaging you may set
this to zero, otherwise set it to at least one.
This function creates a new context without closing the old one. Use it before
creating any sockets.
Default value 1
*/
func SetIoThreads(n int) error {
if n != nr_of_threads {
c, err := C.zmq_init(C.int(n))
if c == nil {
return errget(err)
}
nr_of_threads = n
ctx = c
}
return nil
}
//. Sockets
// Specifies the type of a socket, used by NewSocket()
type Type int
const (
// Constants for NewSocket()
// See: http://api.zeromq.org/2-2:zmq-socket#toc3
REQ = Type(C.ZMQ_REQ)
REP = Type(C.ZMQ_REP)
DEALER = Type(C.ZMQ_DEALER)
ROUTER = Type(C.ZMQ_ROUTER)
PUB = Type(C.ZMQ_PUB)
SUB = Type(C.ZMQ_SUB)
XPUB = Type(C.ZMQ_XPUB)
XSUB = Type(C.ZMQ_XSUB)
PUSH = Type(C.ZMQ_PUSH)
PULL = Type(C.ZMQ_PULL)
PAIR = Type(C.ZMQ_PAIR)
)
/*
Socket type as string.
*/
func (t Type) String() string {
switch t {
case REQ:
return "REQ"
case REP:
return "REP"
case DEALER:
return "DEALER"
case ROUTER:
return "ROUTER"
case PUB:
return "PUB"
case SUB:
return "SUB"
case XPUB:
return "XPUB"
case XSUB:
return "XSUB"
case PUSH:
return "PUSH"
case PULL:
return "PULL"
case PAIR:
return "PAIR"
}
return "<INVALID>"
}
// Used by (*Socket)Send() and (*Socket)Recv()
type Flag int
const (
// Flags for (*Socket)Send(), (*Socket)Recv()
// For Send, see: http://api.zeromq.org/2-2:zmq-send#toc2
// For Recv, see: http://api.zeromq.org/2-2:zmq-recv#toc2
NOBLOCK = Flag(C.ZMQ_NOBLOCK)
SNDMORE = Flag(C.ZMQ_SNDMORE)
)
/*
Socket flag as string.
*/
func (f Flag) String() string {
ff := make([]string, 0)
if f&NOBLOCK != 0 {
ff = append(ff, "NOBLOCK")
}
if f&SNDMORE != 0 {
ff = append(ff, "SNDMORE")
}
if len(ff) == 0 {
return "<NONE>"
}
return strings.Join(ff, "|")
}
// Used by (soc *Socket)GetEvents()
type State uint32
const (
// Flags for (*Socket)GetEvents()
// See: http://api.zeromq.org/2-2:zmq-getsockopt#toc22
POLLIN = State(C.ZMQ_POLLIN)
POLLOUT = State(C.ZMQ_POLLOUT)
)
// Uses by Device()
type Dev int
const (
// Constants for Device()
// See: http://api.zeromq.org/2-2:zmq-device#toc2
QUEUE = Dev(C.ZMQ_QUEUE)
FORWARDER = Dev(C.ZMQ_FORWARDER)
STREAMER = Dev(C.ZMQ_STREAMER)
)
/*
Dev as string
*/
func (d Dev) String() string {
switch d {
case QUEUE:
return "QUEUE"
case FORWARDER:
return "FORWARDER"
case STREAMER:
return "STREAMER"
}
return "<INVALID>"
}
/*
Socket state as string.
*/
func (s State) String() string {
ss := make([]string, 0)
if s&POLLIN != 0 {
ss = append(ss, "POLLIN")
}
if s&POLLOUT != 0 {
ss = append(ss, "POLLOUT")
}
if len(ss) == 0 {
return "<NONE>"
}
return strings.Join(ss, "|")
}
/*
Socket functions starting with `Set` or `Get` are used for setting and
getting socket options.
*/
type Socket struct {
soc unsafe.Pointer
}
/*
Socket as string.
*/
func (soc Socket) String() string {
t, _ := soc.GetType()
return "Socket(" + t.String() + ")"
}
/*
Create 0MQ socket.
WARNING:
The Socket is not thread safe. This means that you cannot access the same Socket
from different goroutines without using something like a mutex.
For a description of socket types, see: http://api.zeromq.org/2-2:zmq-socket#toc3
*/
func NewSocket(t Type) (soc *Socket, err error) {
soc = &Socket{}
s, e := C.zmq_socket(ctx, C.int(t))
if s == nil {
err = errget(e)
} else {
soc.soc = s
runtime.SetFinalizer(soc, (*Socket).Close)
}
return
}
// If not called explicitly, the socket will be closed on garbage collection
func (soc *Socket) Close() error {
if i, err := C.zmq_close(soc.soc); int(i) != 0 {
return errget(err)
}
soc.soc = unsafe.Pointer(nil)
return nil
}
/*
Accept incoming connections on a socket.
For a description of endpoint, see: http://api.zeromq.org/2-2:zmq-bind#toc2
*/
func (soc *Socket) Bind(endpoint string) error {
s := C.CString(endpoint)
defer C.free(unsafe.Pointer(s))
if i, err := C.zmq_bind(soc.soc, s); int(i) != 0 {
return errget(err)
}
return nil
}
/*
Create outgoing connection from socket.
For a description of endpoint, see: http://api.zeromq.org/2-2:zmq-connect#toc2
*/
func (soc *Socket) Connect(endpoint string) error {
s := C.CString(endpoint)
defer C.free(unsafe.Pointer(s))
if i, err := C.zmq_connect(soc.soc, s); int(i) != 0 {
return errget(err)
}
return nil
}
/*
Receive a message part from a socket.
For a description of flags, see: http://api.zeromq.org/2-2:zmq-recv#toc2
*/
func (soc *Socket) Recv(flags Flag) (string, error) {
b, err := soc.RecvBytes(flags)
return string(b), err
}
/*
Receive a message part from a socket.
For a description of flags, see: http://api.zeromq.org/2-2:zmq-recv#toc2
*/
func (soc *Socket) RecvBytes(flags Flag) ([]byte, error) {
var msg C.zmq_msg_t
if i, err := C.zmq_msg_init(&msg); i != 0 {
return []byte{}, errget(err)
}
defer C.zmq_msg_close(&msg)
var size C.int
var err error
var i C.int
i, err = C.zmq_recv(soc.soc, &msg, C.int(flags))
if i == 0 {
size = C.int(C.zmq_msg_size(&msg))
} else {
size = -1
}
if size < 0 {
return []byte{}, errget(err)
}
if size == 0 {
return []byte{}, nil
}
data := make([]byte, int(size))
C.memcpy(unsafe.Pointer(&data[0]), C.zmq_msg_data(&msg), C.size_t(size))
return data, nil
}
/*
Send a message part on a socket.
For a description of flags, see: http://api.zeromq.org/2-2:zmq-send#toc2
*/
func (soc *Socket) Send(data string, flags Flag) (int, error) {
return soc.SendBytes([]byte(data), flags)
}
/*
Send a message part on a socket.
For a description of flags, see: http://api.zeromq.org/2-2:zmq-send#toc2
*/
func (soc *Socket) SendBytes(data []byte, flags Flag) (int, error) {
datac := C.CString(string(data))
var msg C.zmq_msg_t
if i, err := C.my_msg_init_data(&msg, unsafe.Pointer(datac), C.size_t(len(data))); i != 0 {
return -1, errget(err)
}
defer C.zmq_msg_close(&msg)
n, err := C.zmq_send(soc.soc, &msg, C.int(flags))
if n != 0 {
return -1, errget(err)
}
return int(n), nil
}
/*
Start built-in ØMQ device
see: http://api.zeromq.org/2-2:zmq-device#toc2
*/
func Device(device Dev, frontend, backend *Socket) error {
_, err := C.zmq_device(C.int(device), frontend.soc, backend.soc)
return errget(err)
}
/*
Emulate the proxy that will be built-in in 0MQ version 3
See: http://api.zeromq.org/3-2:zmq-proxy
*/
func Proxy(frontend, backend, capture *Socket) error {
items := NewPoller()
items.Add(frontend, POLLIN)
items.Add(backend, POLLIN)
for {
sockets, err := items.Poll(-1)
if err != nil {
return err
}
for _, socket := range sockets {
for more := true; more; {
msg, err := socket.Socket.RecvBytes(0)
if err != nil {
return err
}
more, err = socket.Socket.GetRcvmore()
if err != nil {
return err
}
fl := SNDMORE
if !more {
fl = 0
}
if capture != nil {
_, err = capture.SendBytes(msg, fl)
if err != nil {
return err
}
}
switch socket.Socket {
case frontend:
_, err = backend.SendBytes(msg, fl)
case backend:
_, err = frontend.SendBytes(msg, fl)
}
if err != nil {
return err
}
}
}
}
return nil
}