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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;
const char *request_str;
int request_sent;
};
struct im_zmq *im_zmq_connect(struct im_zmq_params *params)
{
struct im_zmq *z;
z = malloc(sizeof(struct im_zmq));
if ( z == NULL ) return NULL;
z->ctx = zmq_ctx_new();
if ( z->ctx == NULL ) {
free(z);
return NULL;
}
if ( params->request == NULL ) {
STATUS("Connecting ZMQ subscriber to '%s'\n", params->addr);
z->socket = zmq_socket(z->ctx, ZMQ_SUB);
} else {
STATUS("Connecting ZMQ requester to '%s'\n", params->addr);
z->socket = zmq_socket(z->ctx, ZMQ_REQ);
}
if ( z->socket == NULL ) {
free(z);
return NULL;
}
if ( zmq_connect(z->socket, params->addr) == -1 ) {
ERROR("ZMQ connection failed: %s\n", zmq_strerror(errno));
free(z);
return NULL;
}
int timeout = 3000;
zmq_setsockopt(z->socket, ZMQ_RCVTIMEO, &timeout, sizeof(timeout));
int linger = 0;;
zmq_setsockopt(z->socket, ZMQ_LINGER, &linger, sizeof(linger));
if ( params->request == NULL ) {
int i;
/* SUB mode */
if ( params->n_subscriptions == 0 ) {
ERROR("WARNING: No ZeroMQ subscriptions. You should "
"probably try again with --zmq-subscribe.\n");
}
for ( i=0; i<params->n_subscriptions; i++ ) {
STATUS("Subscribing to '%s'\n", params->subscriptions[i]);
if ( zmq_setsockopt(z->socket, ZMQ_SUBSCRIBE,
params->subscriptions[i],
strlen(params->subscriptions[i])) )
{
ERROR("ZMQ subscription failed: %s\n",
zmq_strerror(errno));
return NULL;
}
}
z->request_str = NULL;
} else {
/* REQ mode */
z->request_str = params->request;
z->request_sent = 0;
}
return z;
}
void *im_zmq_fetch(struct im_zmq *z, size_t *pdata_size)
{
int msg_size;
void *data_copy;
if ( (z->request_str != NULL) && !z->request_sent ) {
/* Send the request */
if ( zmq_send(z->socket, z->request_str,
strlen(z->request_str), 0) == -1 )
{
ERROR("ZMQ message send failed: %s\n",
zmq_strerror(errno));
return NULL;
}
z->request_sent = 1;
}
/* Receive message */
zmq_msg_init(&z->msg);
msg_size = zmq_msg_recv(&z->msg, z->socket, 0);
if ( msg_size == -1 ) {
if ( errno != EAGAIN ) {
ERROR("ZMQ recieve failed: %s\n", zmq_strerror(errno));
}
zmq_msg_close(&z->msg);
return NULL;
}
/* Reply received. OK to send request again */
z->request_sent = 0;
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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