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/*
* zmq.c
*
* ZMQ data interface
*
* Copyright © 2017-2020 Deutsches Elektronen-Synchrotron DESY,
* a research centre of the Helmholtz Association.
*
* Authors:
* 2018-2020 Thomas White <taw@physics.org>
* 2014 Valerio Mariani
* 2017 Stijn de Graaf
*
* This file is part of CrystFEL.
*
* CrystFEL 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 3 of the License, or
* (at your option) any later version.
*
* CrystFEL 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 CrystFEL. If not, see <http://www.gnu.org/licenses/>.
*
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdlib.h>
#include <stdio.h>
#include <stdint.h>
#include <assert.h>
#include <unistd.h>
#include <zmq.h>
#include <msgpack.h>
#include <events.h>
#include <image.h>
#include <utils.h>
#include "im-zmq.h"
#include "datatemplate_priv.h"
struct im_zmq
{
void *ctx;
void *socket;
zmq_msg_t msg;
msgpack_unpacked unpacked;
int unpacked_set;
};
struct im_zmq *im_zmq_connect(const char *zmq_address)
{
struct im_zmq *z;
z = malloc(sizeof(struct im_zmq));
if ( z == NULL ) return NULL;
z->unpacked_set = 0;
z->ctx = zmq_ctx_new();
if ( z->ctx == NULL ) return NULL;
z->socket = zmq_socket(z->ctx, ZMQ_REQ);
if ( z->socket == NULL ) return NULL;
STATUS("Connecting to ZMQ at '%s'\n", zmq_address);
if ( zmq_connect(z->socket, zmq_address) == -1 ) {
ERROR("ZMQ connection failed: %s\n", zmq_strerror(errno));
return NULL;
}
STATUS("ZMQ connected.\n");
return z;
}
msgpack_object *im_zmq_fetch(struct im_zmq *z)
{
int msg_size;
int r;
if ( zmq_send(z->socket, "m", 1, 0) == -1 ) {
ERROR("ZMQ message send failed: %s\n", zmq_strerror(errno));
return NULL;
}
zmq_msg_init(&z->msg);
msg_size = zmq_msg_recv(&z->msg, z->socket, 0);
if ( msg_size == -1 ) {
ERROR("ZMQ recieve failed: %s\n", zmq_strerror(errno));
zmq_msg_close(&z->msg);
return NULL;
}
msgpack_unpacked_init(&z->unpacked);
r = msgpack_unpack_next(&z->unpacked, zmq_msg_data(&z->msg),
msg_size, NULL);
if ( r != MSGPACK_UNPACK_SUCCESS ) {
ERROR("Msgpack unpack failed: %i\n", r);
zmq_msg_close(&z->msg);
return NULL;
}
z->unpacked_set = 1;
return &z->unpacked.data;
}
/* Clean structures ready for next frame */
void im_zmq_clean(struct im_zmq *z)
{
if ( z->unpacked_set ) {
msgpack_unpacked_destroy(&z->unpacked);
zmq_msg_close(&z->msg);
z->unpacked_set = 0;
}
}
void im_zmq_shutdown(struct im_zmq *z)
{
if ( z == NULL ) return;
zmq_msg_close(&z->msg);
zmq_close(z->socket);
zmq_ctx_destroy(z->ctx);
}
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