mirror of
https://github.com/mii443/libdatachannel.git
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105 lines
2.8 KiB
C++
105 lines
2.8 KiB
C++
/**
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* Copyright (c) 2019 Paul-Louis Ageneau
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef RTC_IMPL_TRANSPORT_H
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#define RTC_IMPL_TRANSPORT_H
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#include "common.hpp"
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#include "internals.hpp"
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#include "message.hpp"
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#include <atomic>
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#include <functional>
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#include <memory>
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namespace rtc::impl {
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class Transport {
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public:
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enum class State { Disconnected, Connecting, Connected, Completed, Failed };
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using state_callback = std::function<void(State state)>;
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Transport(shared_ptr<Transport> lower = nullptr, state_callback callback = nullptr)
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: mLower(std::move(lower)), mStateChangeCallback(std::move(callback)) {}
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virtual ~Transport() { stop(); }
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virtual void start() { mStopped = false; }
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virtual bool stop() {
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if (mStopped.exchange(true))
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return false;
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// We don't want incoming() to be called by the lower layer anymore
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if (mLower) {
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PLOG_VERBOSE << "Unregistering incoming callback";
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mLower->onRecv(nullptr);
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}
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return true;
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}
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void registerIncoming() {
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if (mLower) {
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PLOG_VERBOSE << "Registering incoming callback";
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mLower->onRecv(std::bind(&Transport::incoming, this, std::placeholders::_1));
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}
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}
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void onRecv(message_callback callback) { mRecvCallback = std::move(callback); }
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State state() const { return mState; }
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virtual bool send(message_ptr message) { return outgoing(message); }
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protected:
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void recv(message_ptr message) {
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try {
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mRecvCallback(message);
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} catch (const std::exception &e) {
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PLOG_WARNING << e.what();
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}
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}
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void changeState(State state) {
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try {
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if (mState.exchange(state) != state)
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mStateChangeCallback(state);
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} catch (const std::exception &e) {
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PLOG_WARNING << e.what();
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}
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}
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virtual void incoming(message_ptr message) { recv(message); }
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virtual bool outgoing(message_ptr message) {
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if (mLower)
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return mLower->send(message);
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else
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return false;
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}
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private:
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shared_ptr<Transport> mLower;
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synchronized_callback<State> mStateChangeCallback;
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synchronized_callback<message_ptr> mRecvCallback;
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std::atomic<State> mState = State::Disconnected;
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std::atomic<bool> mStopped = true;
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};
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} // namespace rtc::impl
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#endif
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