Bridge.cpp

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/*
 * MQTTSuite - A lightweight MQTT Integration System
 * Copyright (C) Volker Christian <me@vchrist.at>
 *               2022, 2023, 2024, 2025, 2026
 *
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU 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 General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program. If not, see <https://www.gnu.org/licenses/>.
 */
 
/*
 * MIT License
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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 * THE SOFTWARE.
 */
 
#include "lib/Bridge.h"
 
#include "lib/Mqtt.h"
#include "lib/SSEDistributor.h"
 
#include <core/socket/stream/SocketConnection.h>
#include <iot/mqtt/MqttContext.h>
#include <iot/mqtt/packets/Publish.h>
 
#ifndef DOXYGEN_SHOULD_SKIP_THIS
 
#include <compare>
#include <map>
#include <utility>
 
#endif // DOXYGEN_SHOULD_SKIP_THIS
 
namespace mqtt::bridge::lib {
 
    Bridge::Bridge(const std::string& name, const std::string& prefix, bool disabled)
        : name(name)
        , prefix(prefix)
        , disabled(disabled) {
    }
 
    const std::string& Bridge::getName() const {
        return name;
    }
 
    void Bridge::addBroker(const std::string& fullInstanceName, Broker&& broker) {
        enabledBroker += !broker.getDisabled() ? 1 : 0;
 
        brokerMap.emplace(fullInstanceName, std::move(broker));
    }
 
    Broker* Bridge::getBroker(const std::string& fullInstanceName) {
        return &brokerMap.find(fullInstanceName)->second;
    }
 
    const std::map<const std::string, Broker>& Bridge::getBrokerMap() const {
        return brokerMap;
    }
 
    void Bridge::addMqtt(mqtt::bridge::lib::Mqtt* mqtt) {
        mqttList.push_back(mqtt);
 
        mqtt::bridge::lib::SSEDistributor::instance().brokerConnected(name,
                                                                      mqtt->getMqttContext()->getSocketConnection()->getInstanceName());
 
        if (mqttList.size() == enabledBroker) {
            mqtt::bridge::lib::SSEDistributor::instance().bridgeStarted(name);
        }
    }
 
    void Bridge::removeMqtt(mqtt::bridge::lib::Mqtt* mqtt) {
        mqttList.remove(mqtt);
 
        mqtt::bridge::lib::SSEDistributor::instance().brokerDisconnected(name,
                                                                         mqtt->getMqttContext()->getSocketConnection()->getInstanceName());
 
        if (mqttList.size() == 0) {
            mqtt::bridge::lib::SSEDistributor::instance().bridgeStopped(name);
        }
    }
 
    void Bridge::publish(const mqtt::bridge::lib::Mqtt* originMqtt, const iot::mqtt::packets::Publish& publish) {
        for (const mqtt::bridge::lib::Mqtt* destinationMqtt : mqttList) {
            if (originMqtt != destinationMqtt) {    // Do not reflect message to origin broker. Avoid message looping
                destinationMqtt->sendPublish(prefix //
                                                 + originMqtt->getBroker().getPrefix()      //
                                                 + destinationMqtt->getBroker().getPrefix() //
                                                 + publish.getTopic(),
                                             publish.getMessage(),
                                             publish.getQoS(),
                                             publish.getRetain());
            }
        }
    }
 
    const std::string& Bridge::getPrefix() const {
        return prefix;
    }
 
    bool Bridge::getDisabled() const {
        return disabled;
    }
 
    bool Bridge::getAllConnected1() const {
        return mqttList.size() == enabledBroker || disabled;
    }
 
    bool Bridge::operator<(const Bridge& rhs) const {
        return name < rhs.name;
    }
 
    const std::list<const Mqtt*>& Bridge::getMqttList() const {
        return mqttList;
    }
 
} // namespace mqtt::bridge::lib