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https://git.rwth-aachen.de/acs/public/villas/node/
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108 lines
2.9 KiB
C
108 lines
2.9 KiB
C
/** Node type: WebSockets
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*
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* This file implements the websocket type for nodes.
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* It's based on the libwebsockets library.
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*
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* @file
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* @author Steffen Vogel <stvogel@eonerc.rwth-aachen.de>
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* @copyright 2017, Institute for Automation of Complex Power Systems, EONERC
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* @license GNU General Public License (version 3)
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*
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* VILLASnode
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*********************************************************************************/
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/**
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* @addtogroup websockets WebSockets node type
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* @ingroup node
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* @{
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*/
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#pragma once
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#include <libwebsockets.h>
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#include "node.h"
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#include "pool.h"
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#include "queue_signalled.h"
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#include "common.h"
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#include "config.h"
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#define DEFAULT_WEBSOCKET_QUEUELEN (DEFAULT_QUEUELEN * 64)
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#define DEFAULT_WEBSOCKET_SAMPLELEN DEFAULT_SAMPLELEN
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/* Forward declaration */
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struct lws;
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/** Internal data per websocket node */
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struct websocket {
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struct list connections; /**< List of active libwebsocket connections in server mode (struct websocket_connection). */
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struct list destinations; /**< List of websocket servers connect to in client mode (struct websocket_destination). */
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struct pool pool;
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struct queue_signalled queue; /**< For samples which are received from WebSockets */
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};
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/* Internal datastructures */
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struct websocket_connection {
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struct node *node;
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struct lws *wsi;
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struct queue queue; /**< For samples which are sent to the WebSocket */
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struct {
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char name[64];
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char ip[64];
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} peer;
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enum {
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WEBSOCKET_MODE_CLIENT,
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WEBSOCKET_MODE_SERVER,
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} mode;
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enum state state;
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char *_name;
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};
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struct websocket_destination {
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char *uri;
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struct lws_client_connect_info info;
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};
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int websocket_protocol_cb(struct lws *wsi, enum lws_callback_reasons reason, void *user, void *in, size_t len);
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/** @see node_vtable::init */
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int websocket_init(struct super_node *sn);
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/** @see node_type::deinit */
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int websocket_deinit();
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/** @see node_type::open */
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int websocket_start(struct node *n);
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/** @see node_type::close */
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int websocket_stop(struct node *n);
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/** @see node_type::close */
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int websocket_destroy(struct node *n);
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/** @see node_type::read */
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int websocket_read(struct node *n, struct sample *smps[], unsigned cnt);
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/** @see node_type::write */
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int websocket_write(struct node *n, struct sample *smps[], unsigned cnt);
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/** @} */
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