SubProtocol.hpp

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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/>.
 */
 
#include "core/socket/stream/SocketConnection.h"
#include "iot/mqtt/SubProtocol.h"
#include "log/Logger.h"
#include "utils/system/signal.h"
#include "web/websocket/SubProtocolContext.h"
 
#ifndef DOXYGEN_SHOULD_SKIP_THIS
 
#include "utils/hexdump.h"
 
#include <algorithm>
 
#endif // DOXYGEN_SHOULD_SKIP_THIS
 
namespace iot::mqtt {
 
    template <typename WSSubProtocolRole>
    SubProtocol<WSSubProtocolRole>::SubProtocol(web::websocket::SubProtocolContext* subProtocolContext,
                                                const std::string& name,
                                                iot::mqtt::Mqtt* mqtt)
        : WSSubProtocolRole(subProtocolContext, name, 0)
        , iot::mqtt::MqttContext(mqtt)
        , onReceivedFromPeerEvent([this]([[maybe_unused]] const utils::Timeval& currentTime) {
            iot::mqtt::MqttContext::onReceivedFromPeer();
 
            if (size > 0) {
                onReceivedFromPeerEvent.span();
            } else {
                buffer.clear();
                cursor = 0;
            }
        }) {
    }
 
    template <typename WSSubProtocolRole>
    std::size_t SubProtocol<WSSubProtocolRole>::recv(char* chunk, std::size_t chunklen) {
        std::size_t maxReturn = std::min(chunklen, size);
 
        std::copy(buffer.data() + cursor, buffer.data() + cursor + maxReturn, chunk);
 
        cursor += maxReturn;
        size -= maxReturn;
 
        return maxReturn;
    }
 
    template <typename WSSubProtocolRole>
    void SubProtocol<WSSubProtocolRole>::send(const char* chunk, std::size_t chunklen) {
        WSSubProtocolRole::sendMessage(chunk, chunklen);
    }
 
    template <typename WSSubProtocolRole>
    void SubProtocol<WSSubProtocolRole>::end([[maybe_unused]] bool fatal) {
        WSSubProtocolRole::sendClose();
    }
 
    template <typename WSSubProtocolRole>
    void SubProtocol<WSSubProtocolRole>::close() {
        WSSubProtocolRole::sendClose();
    }
 
    template <typename WSSubProtocolRole>
    void SubProtocol<WSSubProtocolRole>::onConnected() {
        LOG(INFO) << getSocketConnection()->getConnectionName() << " WSMQTT: connected:";
        iot::mqtt::MqttContext::onConnected();
    }
 
    template <typename WSSubProtocolRole>
    void SubProtocol<WSSubProtocolRole>::onMessageStart(int opCode) {
        if (opCode == web::websocket::SubProtocolContext::OpCode::TEXT) {
            LOG(ERROR) << getSocketConnection()->getConnectionName() << " WSMQTT: Wrong Opcode: " << opCode;
            this->end(true);
        } else {
            LOG(DEBUG) << getSocketConnection()->getConnectionName() << " WSMQTT: Message START: " << opCode;
        }
    }
 
    template <typename WSSubProtocolRole>
    void SubProtocol<WSSubProtocolRole>::onMessageData(const char* chunk, std::size_t chunkLen) {
        data.append(std::string(chunk, chunkLen));
 
        LOG(DEBUG) << getSocketConnection()->getConnectionName() << " WebSocket: Frame Data:\n"
                   << std::string(32, ' ').append(utils::hexDump(std::vector<char>(chunk, chunk + chunkLen), 32));
    }
 
    template <typename WSSubProtocolRole>
    void SubProtocol<WSSubProtocolRole>::onMessageEnd() {
        LOG(DEBUG) << getSocketConnection()->getConnectionName() << " WSMQTT: Message END";
 
        buffer.insert(buffer.end(), data.begin(), data.end());
        size += data.size();
        data.clear();
 
        iot::mqtt::MqttContext::onReceivedFromPeer();
 
        if (size > 0) {
            onReceivedFromPeerEvent.span();
        } else {
            buffer.clear();
            cursor = 0;
        }
    }
 
    template <typename WSSubProtocolRole>
    void SubProtocol<WSSubProtocolRole>::onMessageError(uint16_t errnum) {
        LOG(ERROR) << getSocketConnection()->getConnectionName() << " WSMQTT: Message error: " << errnum;
    }
 
    template <typename WSSubProtocolRole>
    void SubProtocol<WSSubProtocolRole>::onDisconnected() {
        iot::mqtt::MqttContext::onDisconnected();
        LOG(DEBUG) << getSocketConnection()->getConnectionName() << " WSMQTT: disconnected:";
    }
 
    template <typename WSSubProtocolRole>
    bool SubProtocol<WSSubProtocolRole>::onSignal(int sig) {
        bool ret = iot::mqtt::MqttContext::onSignal(sig);
        LOG(INFO) << getSocketConnection()->getConnectionName() << " WSMQTT: exit due to '" << strsignal(sig) << "' (SIG"
                  << utils::system::sigabbrev_np(sig) << " = " << sig << ")";
 
        this->sendClose();
 
        return ret;
    }
 
    template <typename WSSubProtocolRole>
    core::socket::stream::SocketConnection* SubProtocol<WSSubProtocolRole>::getSocketConnection() const {
        return WSSubProtocolRole::subProtocolContext->getSocketConnection();
    }
 
} // namespace iot::mqtt