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VILLASnode/include/villas/nodes/webrtc/peer_connection.hpp
Steffen Vogel 1748f433fe webrtc: Fix libdatachannel version detection
Signed-off-by: Steffen Vogel <post@steffenvogel.de>
2024-05-28 19:45:55 -07:00

127 lines
3.7 KiB
C++

/* WebRTC peer connection.
*
* Author: Steffen Vogel <post@steffenvogel.de>
* Author: Philipp Jungkamp <Philipp.Jungkamp@opal-rt.com>
* SPDX-FileCopyrightText: 2014-2023 Institute for Automation of Complex Power Systems, RWTH Aachen University
* SPDX-FileCopyrightText: 2023 OPAL-RT Germany GmbH
* SPDX-License-Identifier: Apache-2.0
*/
#pragma once
#include <fmt/ostream.h>
#include <jansson.h>
#include <rtc/peerconnection.hpp>
#include <rtc/rtc.hpp>
#include <villas/config.hpp>
#include <villas/log.hpp>
#include <villas/node/config.hpp>
#include <villas/nodes/webrtc/signaling_client.hpp>
#include <villas/signal_list.hpp>
#include <villas/web.hpp>
/*
* libdatachannel defines the operator<< overloads required to format
* rtc::PeerConnection::State and similar in the global namespace.
* But C++ ADL based overload set construction does not find these operators,
* if these are invoked in the spdlog/fmt libraries.
*
* See this issue for a short explanation of ADL errors:
* https://github.com/gabime/spdlog/issues/1227#issuecomment-532009129
*
* Adding the global ::operator<< overload set to the namespace rtc where
* the data structures are defined, allows ADL to pick these up in spdlog/fmt.
*
* Since libdatachannel 0.20, operator<< has been moved into the rtc namespace.
*/
#if RTC_VERSION_NUM < 0x001400
namespace rtc {
using ::operator<<;
}
#endif
#ifndef FMT_LEGACY_OSTREAM_FORMATTER
template <>
class fmt::formatter<rtc::PeerConnection::State>
: public fmt::ostream_formatter {};
#endif
namespace villas {
namespace node {
namespace webrtc {
class PeerConnection {
public:
PeerConnection(const std::string &server, const std::string &session,
const std::string &peer,
std::shared_ptr<SignalList> out_signals,
rtc::Configuration config, Web *w, rtc::DataChannelInit d);
~PeerConnection();
bool waitForDataChannel(std::chrono::seconds timeout);
void onMessage(std::function<void(rtc::binary)> callback);
void sendMessage(rtc::binary msg);
json_t *readStatus() const;
void connect();
void disconnect();
protected:
Web *web;
std::vector<rtc::IceServer> extraServers;
rtc::DataChannelInit dataChannelInit;
rtc::Configuration defaultConfig;
std::shared_ptr<rtc::PeerConnection> conn;
std::shared_ptr<rtc::DataChannel> chan;
std::shared_ptr<SignalingClient> client;
std::shared_ptr<SignalList> out_signals;
Logger logger;
std::mutex mutex;
std::condition_variable_any startupCondition;
bool stopStartup;
bool warnNotConnected;
bool standby;
bool first;
int firstID;
int secondID;
std::function<void(rtc::binary)> onMessageCallback;
void resetConnection(std::unique_lock<decltype(PeerConnection::mutex)> &lock);
void resetConnectionAndStandby(
std::unique_lock<decltype(PeerConnection::mutex)> &lock);
void notifyStartup();
void setupPeerConnection(std::shared_ptr<rtc::PeerConnection> = nullptr);
void setupDataChannel(std::shared_ptr<rtc::DataChannel> = nullptr);
void onLocalDescription(rtc::Description sdp);
void onLocalCandidate(rtc::Candidate cand);
void onConnectionStateChange(rtc::PeerConnection::State state);
void onSignalingStateChange(rtc::PeerConnection::SignalingState state);
void onGatheringStateChange(rtc::PeerConnection::GatheringState state);
void onSignalingConnected();
void onSignalingDisconnected();
void onSignalingError(std::string err);
void onSignalingMessage(SignalingMessage msg);
void onDataChannel(std::shared_ptr<rtc::DataChannel> dc);
void onDataChannelOpen();
void onDataChannelClosed();
void onDataChannelError(std::string err);
void onDataChannelMessage(rtc::string msg);
void onDataChannelMessage(rtc::binary msg);
};
} // namespace webrtc
} // namespace node
} // namespace villas