mirror of
https://git.rwth-aachen.de/acs/public/villas/node/
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114 lines
2.9 KiB
C++
114 lines
2.9 KiB
C++
/* WebRTC signaling client.
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*
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* Author: Steffen Vogel <post@steffenvogel.de>
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* Author: Philipp Jungkamp <Philipp.Jungkamp@opal-rt.com>
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* SPDX-FileCopyrightText: 2014-2023 Institute for Automation of Complex Power Systems, RWTH Aachen University
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* SPDX-FileCopyrightText: 2023 OPAL-RT Germany GmbH
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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 <chrono>
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#include <functional>
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#include <libwebsockets.h>
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#include <villas/buffer.hpp>
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#include <villas/log.hpp>
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#include <villas/nodes/webrtc/signaling_message.hpp>
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#include <villas/queue.hpp>
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#include <villas/web.hpp>
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namespace villas {
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namespace node {
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// Forward declarations
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class Web;
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namespace webrtc {
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class SignalingClient {
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protected:
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struct sul_offsetof_helper {
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lws_sorted_usec_list_t sul; // Schedule connection retry
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SignalingClient *self;
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} sul_helper;
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uint16_t retry_count; // Count of consecutive retries
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struct lws *wsi;
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struct lws_client_connect_info info;
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// The retry and backoff policy we want to use for our client connections
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static constexpr uint32_t backoff_ms[] = {1 << 4, 1 << 6, 1 << 8, 1 << 10,
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1 << 12, 1 << 14, 1 << 16};
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static constexpr lws_retry_bo_t retry = {
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.retry_ms_table = backoff_ms,
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.retry_ms_table_count = LWS_ARRAY_SIZE(backoff_ms),
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.conceal_count = LWS_ARRAY_SIZE(backoff_ms) + 1,
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.secs_since_valid_ping = 3, // force PINGs after secs idle
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.secs_since_valid_hangup = 10, // hangup after secs idle
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.jitter_percent = 20,
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};
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std::function<void(SignalingMessage)> cbMessage;
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std::function<void()> cbConnected;
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std::function<void()> cbDisconnected;
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std::function<void(std::string)> cbError;
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Queue<SignalingMessage> outgoingMessages;
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Web *web;
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char *uri;
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char *path;
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std::atomic<bool> running;
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Buffer buffer; // A buffer for received fragments before JSON decoding.
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Logger logger;
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int protocolCallback(struct lws *wsi, enum lws_callback_reasons reason,
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void *in, size_t len);
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static void connectStatic(struct lws_sorted_usec_list *sul);
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int writable();
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public:
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SignalingClient(const std::string &server, const std::string &session,
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const std::string &peer, Web *w);
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~SignalingClient();
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static int protocolCallbackStatic(struct lws *wsi,
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enum lws_callback_reasons reason,
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void *user, void *in, size_t len);
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void connect();
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void disconnect();
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void sendMessage(SignalingMessage);
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void onMessage(std::function<void(SignalingMessage)> callback) {
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cbMessage = callback;
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}
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void onConnected(std::function<void()> callback) { cbConnected = callback; }
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void onDisconnected(std::function<void()> callback) {
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cbDisconnected = callback;
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}
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void onError(std::function<void(std::string)> callback) {
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cbError = callback;
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}
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};
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} // namespace webrtc
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} // namespace node
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} // namespace villas
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