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/*
* libzebra ZeroMQ bindings
* Copyright (C) 2015 David Lamparter
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; see the file COPYING; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <zebra.h>
#include <zmq.h>
#include "thread.h"
#include "memory.h"
#include "frr_zmq.h"
#include "log.h"
DEFINE_MTYPE_STATIC(LIB, ZEROMQ_CB, "ZeroMQ callback")
/* libzmq's context */
void *frrzmq_context = NULL;
static unsigned frrzmq_initcount = 0;
void frrzmq_init(void)
{
if (frrzmq_initcount++ == 0) {
frrzmq_context = zmq_ctx_new();
zmq_ctx_set(frrzmq_context, ZMQ_IPV6, 1);
}
}
void frrzmq_finish(void)
{
if (--frrzmq_initcount == 0) {
zmq_ctx_term(frrzmq_context);
frrzmq_context = NULL;
}
}
/* read callback integration */
struct frrzmq_cb {
struct thread *thread;
void *zmqsock;
void *arg;
int fd;
bool cancelled;
void (*cb_msg)(void *arg, void *zmqsock);
void (*cb_part)(void *arg, void *zmqsock,
zmq_msg_t *msg, unsigned partnum);
};
static int frrzmq_read_msg(struct thread *t)
{
struct frrzmq_cb *cb = THREAD_ARG(t);
zmq_msg_t msg;
unsigned partno;
int ret, more;
size_t moresz;
while (1) {
zmq_pollitem_t polli = {
.socket = cb->zmqsock,
.events = ZMQ_POLLIN
};
ret = zmq_poll(&polli, 1, 0);
if (ret < 0)
goto out_err;
if (!(polli.revents & ZMQ_POLLIN))
break;
if (cb->cb_msg) {
cb->cb_msg(cb->arg, cb->zmqsock);
if (cb->cancelled) {
XFREE(MTYPE_ZEROMQ_CB, cb);
return 0;
}
continue;
}
partno = 0;
if (zmq_msg_init(&msg))
goto out_err;
do {
ret = zmq_msg_recv(&msg, cb->zmqsock, ZMQ_NOBLOCK);
if (ret < 0) {
if (errno == EAGAIN)
break;
zmq_msg_close(&msg);
goto out_err;
}
cb->cb_part(cb->arg, cb->zmqsock, &msg, partno);
if (cb->cancelled) {
zmq_msg_close(&msg);
XFREE(MTYPE_ZEROMQ_CB, cb);
return 0;
}
/* cb_part may have read additional parts of the
* message; don't use zmq_msg_more here */
moresz = sizeof(more);
more = 0;
ret = zmq_getsockopt(cb->zmqsock, ZMQ_RCVMORE,
&more, &moresz);
if (ret < 0) {
zmq_msg_close(&msg);
goto out_err;
}
partno++;
} while (more);
zmq_msg_close(&msg);
}
funcname_thread_add_read_write(THREAD_READ, t->master, frrzmq_read_msg,
cb, cb->fd, &cb->thread, t->funcname, t->schedfrom,
t->schedfrom_line);
return 0;
out_err:
zlog_err("ZeroMQ error: %s(%d)", strerror (errno), errno);
return 0;
}
struct frrzmq_cb *funcname_frrzmq_thread_add_read(
struct thread_master *master,
void (*msgfunc)(void *arg, void *zmqsock),
void (*partfunc)(void *arg, void *zmqsock,
zmq_msg_t *msg, unsigned partnum),
void *arg, void *zmqsock, debugargdef)
{
int fd, events;
size_t len;
struct frrzmq_cb *cb;
if (!(msgfunc || partfunc) || (msgfunc && partfunc))
return NULL;
len = sizeof(fd);
if (zmq_getsockopt(zmqsock, ZMQ_FD, &fd, &len))
return NULL;
len = sizeof(events);
if (zmq_getsockopt(zmqsock, ZMQ_EVENTS, &events, &len))
return NULL;
cb = XCALLOC(MTYPE_ZEROMQ_CB, sizeof(struct frrzmq_cb));
if (!cb)
return NULL;
cb->arg = arg;
cb->zmqsock = zmqsock;
cb->cb_msg = msgfunc;
cb->cb_part = partfunc;
cb->fd = fd;
if (events & ZMQ_POLLIN)
funcname_thread_add_event(master,
frrzmq_read_msg, cb, fd, &cb->thread,
funcname, schedfrom, fromln);
else
funcname_thread_add_read_write(THREAD_READ, master,
frrzmq_read_msg, cb, fd, &cb->thread,
funcname, schedfrom, fromln);
return cb;
}
void frrzmq_thread_cancel(struct frrzmq_cb *cb)
{
if (!cb->thread) {
/* canceling from within callback */
cb->cancelled = 1;
return;
}
thread_cancel(cb->thread);
XFREE(MTYPE_ZEROMQ_CB, cb);
}
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