mirror of
https://git.rwth-aachen.de/acs/public/villas/node/
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115 lines
3.1 KiB
C++
115 lines
3.1 KiB
C++
/** Node type: WebSockets
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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 2014-2020, 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 <villas/node.h>
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#include <villas/pool.h>
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#include <villas/queue_signalled.h>
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#include <villas/common.hpp>
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#include <villas/buffer.hpp>
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#include <villas/io.h>
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#include <villas/node/config.h>
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#define DEFAULT_WEBSOCKET_QUEUE_LENGTH (DEFAULT_QUEUE_LENGTH * 64)
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#define DEFAULT_WEBSOCKET_SAMPLE_LENGTH DEFAULT_SAMPLE_LENGTH
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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 vlist 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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enum State {
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DESTROYED,
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INITIALIZED,
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CONNECTING,
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RECONNECTING,
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ESTABLISHED,
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SHUTDOWN,
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ERROR
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} state; /**< The current status of this connection. */
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enum class Mode {
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CLIENT,
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SERVER,
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} mode;
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struct lws *wsi;
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struct vnode *node;
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struct io io;
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struct queue queue; /**< For samples which are sent to the Websocket */
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struct format_type *format;
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struct websocket_destination *destination;
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struct {
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villas::Buffer *recv; /**< A buffer for reconstructing fragmented messages. */
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villas::Buffer *send; /**< A buffer for constructing messages before calling lws_write() */
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} buffers;
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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_type::type_start */
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int websocket_type_start(villas::node::SuperNode *sn);
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/** @see node_type::type_stop */
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int websocket_type_stop();
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/** @see node_type::start */
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int websocket_start(struct vnode *n);
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/** @see node_type::stop */
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int websocket_stop(struct vnode *n);
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/** @see node_type::stop */
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int websocket_destroy(struct vnode *n);
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/** @see node_type::read */
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int websocket_read(struct vnode *n, struct sample *smps[], unsigned cnt, unsigned *release);
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/** @see node_type::write */
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int websocket_write(struct vnode *n, struct sample *smps[], unsigned cnt, unsigned *release);
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/** @} */
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