mirror of
https://git.rwth-aachen.de/acs/public/villas/node/
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139 lines
3.3 KiB
C++
139 lines
3.3 KiB
C++
/* Node type: WebSockets.
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*
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* Author: Steffen Vogel <post@steffenvogel.de>
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* SPDX-FileCopyrightText: 2014-2023 Institute for Automation of Complex Power Systems, RWTH Aachen University
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* SPDX-License-Identifier: Apache-2.0
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*/
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#pragma once
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#include <fmt/ostream.h>
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#include <libwebsockets.h>
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#include <villas/buffer.hpp>
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#include <villas/common.hpp>
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#include <villas/config.hpp>
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#include <villas/format.hpp>
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#include <villas/node.hpp>
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#include <villas/node/config.hpp>
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#include <villas/node_compat.hpp>
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#include <villas/pool.hpp>
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#include <villas/queue_signalled.h>
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// Forward declarations
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struct lws;
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namespace villas {
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namespace node {
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#define DEFAULT_WEBSOCKET_QUEUE_LENGTH (DEFAULT_QUEUE_LENGTH * 64)
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// Internal data per websocket node
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struct websocket {
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struct List
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destinations; // List of websocket servers connect to in client mode (struct websocket_destination).
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bool wait; // Wait until all destinations are connected.
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struct Pool pool;
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struct CQueueSignalled
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queue; // For samples which are received from WebSockets
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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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// 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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CLOSING,
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CLOSED,
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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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NodeCompat *node;
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Format *formatter;
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struct CQueue queue; // For samples which are sent to the Websocket
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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
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*send; // A buffer for constructing messages before calling lws_write()
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} buffers;
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friend std::ostream &operator<<(std::ostream &os,
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const struct websocket_connection &c) {
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if (c.wsi) {
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char name[128];
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lws_get_peer_simple(c.wsi, name, sizeof(name));
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os << "remote=" << name;
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} else if (c.mode == websocket_connection::Mode::CLIENT &&
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c.destination != nullptr)
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os << "dest=" << c.destination->info.address << ":"
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<< c.destination->info.port;
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if (c.node)
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os << ", node=" << c.node->getName();
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os << ", mode="
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<< (c.mode == websocket_connection::Mode::CLIENT ? "client" : "server");
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return os;
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}
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std::string toString() {
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std::stringstream ss;
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ss << *this;
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return ss.str();
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}
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};
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int websocket_protocol_cb(struct lws *wsi, enum lws_callback_reasons reason,
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void *user, void *in, size_t len);
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int websocket_type_start(SuperNode *sn);
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int websocket_type_stop();
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int websocket_parse(NodeCompat *n, json_t *j);
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char *websocket_print(NodeCompat *n);
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int websocket_start(NodeCompat *n);
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int websocket_stop(NodeCompat *n);
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int websocket_init(NodeCompat *n);
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int websocket_destroy(NodeCompat *n);
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int websocket_poll_fds(NodeCompat *n, int fds[]);
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int websocket_read(NodeCompat *n, struct Sample *const smps[], unsigned cnt);
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int websocket_write(NodeCompat *n, struct Sample *const smps[], unsigned cnt);
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} // namespace node
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} // namespace villas
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#ifndef FMT_LEGACY_OSTREAM_FORMATTER
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template <>
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class fmt::formatter<villas::node::websocket_connection>
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: public fmt::ostream_formatter {};
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#endif
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