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VILLASnode/include/villas/nodes/ngsi.hpp

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/** Node type: OMA Next Generation Services Interface 10 (NGSI) (FIWARE context broker)
*
* This file implements the NGSI context interface. NGSI is RESTful HTTP is specified by
* the Open Mobile Alliance (OMA).
* It uses the standard operations of the NGSI 10 context information standard.
*
* @see https://forge.fiware.org/plugins/mediawiki/wiki/fiware/index.php/FI-WARE_NGSI-10_Open_RESTful_API_Specification
* @see http://technical.openmobilealliance.org/Technical/Release_Program/docs/NGSI/V1_0-20120529-A/OMA-TS-NGSI_Context_Management-V1_0-20120529-A.pdf
* @file
* @author Steffen Vogel <stvogel@eonerc.rwth-aachen.de>
* @copyright 2014-2020, Institute for Automation of Complex Power Systems, EONERC
* @license GNU General Public License (version 3)
*
* VILLASnode
*
* 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 3 of the License, or
* 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. If not, see <http://www.gnu.org/licenses/>.
*********************************************************************************/
/**
* @addtogroup ngsi FIRWARE NGSI 9/10 RESTful HTTP API
* @ingroup node
* @{
*/
#pragma once
#include <curl/curl.h>
#include <jansson.h>
#include <villas/list.h>
#include <villas/node.h>
#include <villas/task.hpp>
/* Forward declarations */
struct vnode;
struct ngsi {
const char *endpoint; /**< The NGSI context broker endpoint URL. */
const char *entity_id; /**< The context broker entity id related to this node */
const char *entity_type; /**< The type of the entity */
const char *access_token; /**< An optional authentication token which will be sent as HTTP header. */
bool create; /**< Weather we want to create the context element during startup. */
bool remove; /**< Weather we want to delete the context element during startup. */
double timeout; /**< HTTP timeout in seconds */
double rate; /**< Rate used for polling. */
struct Task task; /**< Timer for periodic events. */
int ssl_verify; /**< Boolean flag whether SSL server certificates should be verified or not. */
struct curl_slist *headers; /**< List of HTTP request headers for libcurl */
struct {
CURL *curl; /**< libcurl: handle */
struct vlist signals; /**< A mapping between indices of the VILLASnode samples and the attributes in ngsi::context */
} in, out;
};
/** Initialize global NGSI settings and maps shared memory regions.
*
* @see node_type::type_start
*/
int ngsi_type_start(villas::node::SuperNode *sn);
/** Free global NGSI settings and unmaps shared memory regions.
*
* @see node_type::type_stop
*/
int ngsi_type_stop();
/** @see node_type::parse */
int ngsi_parse(struct vnode *n, json_t *cfg);
/** @see node_type::print */
char * ngsi_print(struct vnode *n);
/** @see node_type::start */
int ngsi_start(struct vnode *n);
/** @see node_type::stop */
int ngsi_stop(struct vnode *n);
/** @see node_type::reverse */
int ngsi_reverse(struct vnode *n);
/** @see node_type::read */
int ngsi_read(struct vnode *n, struct sample *smps[], unsigned cnt, unsigned *release);
/** @see node_type::write */
int ngsi_write(struct vnode *n, struct sample *smps[], unsigned cnt, unsigned *release);
/** @} */