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/*
* zmq.c
*
* ZMQ data interface
*
* Copyright © 2017-2021 Deutsches Elektronen-Synchrotron DESY,
* a research centre of the Helmholtz Association.
*
* Authors:
* 2018-2021 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 <image.h>
#include <utils.h>
#include "im-zmq.h"
#include "datatemplate_priv.h"
struct im_zmq
{
void *ctx;
void *socket;
zmq_msg_t msg;
};
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->ctx = zmq_ctx_new();
if ( z->ctx == NULL ) return NULL;
z->socket = zmq_socket(z->ctx, ZMQ_SUB);
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. Subscribing to 'ondaframedata'\n");
if ( zmq_setsockopt(z->socket, ZMQ_SUBSCRIBE, "ondaframedata", 13) ) {
ERROR("ZMQ subscription failed: %s\n", zmq_strerror(errno));
return NULL;
}
return z;
}
void *im_zmq_fetch(struct im_zmq *z, size_t *pdata_size)
{
int msg_size;
void *data_copy;
zmq_msg_init(&z->msg);
STATUS("requesting data...\n");
msg_size = zmq_msg_recv(&z->msg, z->socket, 0);
STATUS("done (got %i bytes)\n", msg_size);
if ( msg_size == -1 ) {
ERROR("ZMQ recieve failed: %s\n", zmq_strerror(errno));
zmq_msg_close(&z->msg);
return NULL;
}
data_copy = malloc(msg_size);
if ( data_copy == NULL ) return NULL;
memcpy(data_copy, zmq_msg_data(&z->msg), msg_size);
zmq_msg_close(&z->msg);
*pdata_size = msg_size;
return data_copy;
}
void im_zmq_shutdown(struct im_zmq *z)
{
if ( z == NULL ) return;
zmq_close(z->socket);
zmq_ctx_destroy(z->ctx);
}
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