SocketContextUpgrade.h

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/*
 * SNode.C - a slim toolkit for network communication
 * Copyright (C) Volker Christian <me@vchrist.at>
 *               2020, 2021, 2022, 2023, 2024, 2025
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published
 * by the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */
 
#ifndef WEB_WEBSOCKET_SOCKETCONTEXT_H
#define WEB_WEBSOCKET_SOCKETCONTEXT_H
 
#include "web/http/SocketContextUpgrade.h" // IWYU pragma: export
#include "web/websocket/SubProtocolContext.h"
 
namespace core::socket {
    class SocketConnection;
} // namespace core::socket
 
namespace web::http {
    template <typename RequestT, typename ResponseT>
    class SocketContextUpgradeFactory;
} // namespace web::http
 
namespace web::websocket {
    template <typename SubProtocolT>
    class SubProtocolFactory;
}
 
#ifndef DOXYGEN_SHOULD_SKIP_THIS
 
#include "log/Logger.h"
 
#include <cstdint>
#include <endian.h>
#include <iomanip>
#include <string>
 
#endif /* DOXYGEN_SHOULD_SKIP_THIS */
 
#define CLOSE_SOCKET_TIMEOUT 10
 
namespace web::websocket {
 
    template <typename SubProtocolT, typename RequestT, typename ResponseT>
    class SocketContextUpgrade
        : public web::http::SocketContextUpgrade<RequestT, ResponseT>
        , public SubProtocolContext {
    public:
        SocketContextUpgrade() = delete;
        SocketContextUpgrade(const SocketContextUpgrade&) = delete;
        SocketContextUpgrade& operator=(const SocketContextUpgrade&) = delete;
 
    private:
        using Super = web::http::SocketContextUpgrade<RequestT, ResponseT>;
 
    public:
        using SubProtocol = SubProtocolT;
        using Request = RequestT;
        using Response = ResponseT;
 
    private:
        using Super::readFromPeer;
        using Super::sendToPeer;
        using Super::setTimeout;
        using Super::shutdownWrite;
 
    protected:
        enum class Role { SERVER, CLIENT };
 
        SocketContextUpgrade(core::socket::stream::SocketConnection* socketConnection,
                             web::http::SocketContextUpgradeFactory<Request, Response>* socketContextUpgradeFactory,
                             Role role);
 
    public:
        ~SocketContextUpgrade() override = default;
 
    private:
        void sendMessage(uint8_t opCode, const char* message, std::size_t messageLength) override;
        void sendMessageStart(uint8_t opCode, const char* message, std::size_t messageLength) override;
        void sendMessageFrame(const char* message, std::size_t messageLength) override;
        void sendMessageEnd(const char* message, std::size_t messageLength) override;
        void sendPing(const char* reason = nullptr, std::size_t reasonLength = 0) override;
        void sendPong(const char* reason = nullptr, std::size_t reasonLength = 0) override;
        void sendClose(uint16_t statusCode = 1000, const char* reason = nullptr, std::size_t reasonLength = 0) override;
        void sendClose(const char* message, std::size_t messageLength) override;
 
        core::socket::stream::SocketConnection* getSocketConnection() override;
 
        /* WSReceiver */
        void onMessageStart(int opCode) override;
        void onMessageData(const char* chunk, uint64_t chunkLen) override;
        void onMessageEnd() override;
        void onMessageError(uint16_t errnum) override;
 
        /* Callbacks (API) socketConnection -> WSProtocol */
        void onConnected() override;
        void onDisconnected() override;
 
        bool onSignal(int sig) override;
 
        /* SocketContext */
        std::size_t onReceivedFromPeer() override;
 
    protected:
        SubProtocol* subProtocol = nullptr;
 
    private:
        int receivedOpCode = 0;
 
        std::string pongCloseData;
    };
 
} // namespace web::websocket
 
#endif // WEB_WEBSOCKET_SOCKETCONTEXT_H