SocketServer.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/>.
 */
 
/*
 * 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
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 * furnished to do so, subject to the following conditions:
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 */
 
#ifndef CORE_SOCKET_STREAM_SOCKETSERVERNEW_H
#define CORE_SOCKET_STREAM_SOCKETSERVERNEW_H
 
#include "core/SNodeC.h"
#include "core/eventreceiver/AcceptEventReceiver.h"
#include "core/socket/Socket.h" // IWYU pragma: export
#include "core/socket/State.h"  // IWYU pragma: export
#include "core/socket/stream/SocketContextFactory.h"
#include "core/timer/Timer.h"
 
#ifndef DOXYGEN_SHOULD_SKIP_THIS
 
#include "log/Logger.h"
#include "utils/Random.h"
 
#include <algorithm>
#include <functional>  // IWYU pragma: export
#include <type_traits> // IWYU pragma: export
 
#endif /* DOXYGEN_SHOULD_SKIP_THIS */
 
namespace core::socket::stream {
 
    template <typename SocketAcceptorT, typename SocketContextFactoryT, typename... Args>
        requires std::is_base_of_v<core::eventreceiver::AcceptEventReceiver, SocketAcceptorT> &&
                 std::is_base_of_v<core::socket::stream::SocketContextFactory, SocketContextFactoryT>
    class SocketServer : public core::socket::Socket<typename SocketAcceptorT::Config> {
    private:
        using SocketAcceptor = SocketAcceptorT;
        using SocketContextFactory = SocketContextFactoryT;
 
        using Super = core::socket::Socket<typename SocketAcceptor::Config>;
 
    public:
        using SocketConnection = typename SocketAcceptor::SocketConnection;
        using SocketAddress = typename SocketAcceptor::SocketAddress;
        using Config = typename SocketAcceptor::Config;
 
    private:
        SocketServer(const std::shared_ptr<Config>& config,
                     const std::shared_ptr<SocketContextFactory>& socketContextFactory,
                     const std::function<void(SocketConnection*)>& onConnect,
                     const std::function<void(SocketConnection*)>& onConnected,
                     const std::function<void(SocketConnection*)>& onDisconnect)
            : Super(config)
            , socketContextFactory(socketContextFactory)
            , onConnect(onConnect)
            , onConnected(onConnected)
            , onDisconnect(onDisconnect) {
        }
 
    public:
        SocketServer(const std::string& name,
                     const std::function<void(SocketConnection*)>& onConnect,
                     const std::function<void(SocketConnection*)>& onConnected,
                     const std::function<void(SocketConnection*)>& onDisconnect,
                     Args&&... args)
            : Super(name)
            , socketContextFactory(std::make_shared<SocketContextFactory>(std::forward<Args>(args)...))
            , onConnect([onConnect](SocketConnection* socketConnection) { // onConnect
                LOG(DEBUG) << socketConnection->getConnectionName() << ": OnConnect";
 
                LOG(DEBUG) << "  Local: " << socketConnection->getLocalAddress().toString();
                LOG(DEBUG) << "   Peer: " << socketConnection->getRemoteAddress().toString();
 
                if (onConnect) {
                    onConnect(socketConnection);
                }
            })
            , onConnected([onConnected](SocketConnection* socketConnection) { // onConnected
                LOG(DEBUG) << socketConnection->getConnectionName() << ": OnConnected";
 
                LOG(DEBUG) << "  Local: " << socketConnection->getLocalAddress().toString();
                LOG(DEBUG) << "   Peer: " << socketConnection->getRemoteAddress().toString();
 
                if (onConnected) {
                    onConnected(socketConnection);
                }
            })
            , onDisconnect([onDisconnect](SocketConnection* socketConnection) { // onDisconnect
                LOG(DEBUG) << socketConnection->getConnectionName() << ": OnDisconnect";
 
                LOG(DEBUG) << "            Local: " << socketConnection->getLocalAddress().toString();
                LOG(DEBUG) << "             Peer: " << socketConnection->getRemoteAddress().toString();
 
                LOG(DEBUG) << "     Online Since: " << socketConnection->getOnlineSince();
                LOG(DEBUG) << "  Online Duration: " << socketConnection->getOnlineDuration();
 
                LOG(DEBUG) << "     Total Queued: " << socketConnection->getTotalQueued();
                LOG(DEBUG) << "       Total Sent: " << socketConnection->getTotalSent();
                LOG(DEBUG) << "      Write Delta: " << socketConnection->getTotalQueued() - socketConnection->getTotalSent();
                LOG(DEBUG) << "       Total Read: " << socketConnection->getTotalRead();
                LOG(DEBUG) << "  Total Processed: " << socketConnection->getTotalProcessed();
                LOG(DEBUG) << "       Read Delta: " << socketConnection->getTotalRead() - socketConnection->getTotalProcessed();
 
                if (onDisconnect) {
                    onDisconnect(socketConnection);
                }
            }) {
        }
 
        SocketServer(const std::function<void(SocketConnection*)>& onConnect,
                     const std::function<void(SocketConnection*)>& onConnected,
                     const std::function<void(SocketConnection*)>& onDisconnect,
                     Args&&... args)
            : SocketServer("", onConnect, onConnected, onDisconnect, std::forward<Args>(args)...) {
        }
 
        // VLOG() is used hire as this are log messages for the application
        SocketServer(const std::string& name, Args&&... args)
            : SocketServer(name, {}, {}, {}, std::forward<Args>(args)...) {
        }
 
        explicit SocketServer(Args&&... args)
            : SocketServer("", std::forward<Args>(args)...) {
        }
 
    private:
        void realListen(const std::function<void(const SocketAddress&, core::socket::State)>& onStatus,
                        unsigned int tries,
                        double retryTimeoutScale) const {
            if (core::SNodeC::state() == core::State::RUNNING || core::SNodeC::state() == core::State::INITIALIZED) {
                new SocketAcceptor(
                    socketContextFactory,
                    onConnect,
                    onConnected,
                    onDisconnect,
                    [config = this->config,
                     onConnect = this->onConnect,
                     onConnected = this->onConnected,
                     onDisconnect = this->onDisconnect,
                     socketContextFactory = this->socketContextFactory,
                     onStatus,
                     tries,
                     retryTimeoutScale](const SocketAddress& socketAddress, core::socket::State state) mutable {
                        const bool retryFlag = (state & core::socket::State::NO_RETRY) == 0;
                        state &= ~core::socket::State::NO_RETRY;
                        onStatus(socketAddress, state);
 
                        if (retryFlag && config->getRetry() // Shall we potentially retry? In case are the ...
                            && (config->getRetryTries() == 0 || tries < config->getRetryTries()) // ... limits not reached and has an ...
                            && (state == core::socket::State::ERROR ||
                                (state == core::socket::State::FATAL && config->getRetryOnFatal()))) { // error occurred?
                            double relativeRetryTimeout =
                                config->getRetryLimit() > 0
                                    ? std::min<double>(config->getRetryTimeout() * retryTimeoutScale, config->getRetryLimit())
                                    : config->getRetryTimeout() * retryTimeoutScale;
                            relativeRetryTimeout -= utils::Random::getInRange(-config->getRetryJitter(), config->getRetryJitter()) *
                                                    relativeRetryTimeout / 100.;
 
                            LOG(INFO) << config->getInstanceName() << ": Retry listen in " << relativeRetryTimeout << " seconds";
 
                            core::timer::Timer::singleshotTimer(
                                [config,
                                 onConnect,
                                 onConnected,
                                 onDisconnect,
                                 onStatus,
                                 tries,
                                 retryTimeoutScale,
                                 socketContextFactory]() mutable {
                                    if (config->getRetry()) {
                                        SocketServer(config, socketContextFactory, onConnect, onConnected, onDisconnect)
                                            .realListen(onStatus, tries + 1, retryTimeoutScale * config->getRetryBase());
                                    } else {
                                        LOG(INFO) << config->getInstanceName() << ": Retry listen disabled during wait";
                                    }
                                },
                                relativeRetryTimeout);
                        }
                    },
                    Super::config);
            }
        }
 
    public:
        void listen(const std::function<void(const SocketAddress&, core::socket::State)>& onStatus) const {
            realListen(onStatus, 0, 1);
        }
 
        void listen(const SocketAddress& localAddress,
                    const std::function<void(const SocketAddress&, core::socket::State)>& onStatus) const {
            Super::config->Local::setSocketAddress(localAddress);
 
            listen(onStatus);
        }
 
        void listen(const SocketAddress& localAddress,
                    int backlog,
                    const std::function<void(const SocketAddress&, core::socket::State)>& onStatus) const {
            Super::config->Local::setBacklog(backlog);
 
            listen(localAddress, onStatus);
        }
 
        std::function<void(SocketConnection*)>& getOnConnect() {
            return onConnect;
        }
 
        std::function<void(SocketConnection*)> setOnConnect(const std::function<void(SocketConnection*)>& onConnect,
                                                            bool initialize = false) {
            std::function<void(SocketConnection*)> oldOnConnect = this->onConnect;
 
            this->onConnect = initialize ? onConnect : [oldOnConnect, onConnect](SocketConnection* socketConnection) {
                oldOnConnect(socketConnection);
                onConnect(socketConnection);
            };
 
            return oldOnConnect;
        }
 
        std::function<void(SocketConnection*)>& getOnConnected() {
            return onConnected();
        }
 
        std::function<void(SocketConnection*)> setOnConnected(const std::function<void(SocketConnection*)>& onConnected,
                                                              bool initialize = false) {
            std::function<void(SocketConnection*)> oldOnConnected = this->onConnected;
 
            this->onConnected = initialize ? onConnected : [oldOnConnected, onConnected](SocketConnection* socketConnection) {
                oldOnConnected(socketConnection);
                onConnected(socketConnection);
            };
 
            return oldOnConnected;
        }
 
        std::function<void(SocketConnection*)>& getOnDisconnect() {
            return onDisconnect;
        }
 
        std::function<void(SocketConnection*)> setOnDisconnect(const std::function<void(SocketConnection*)>& onDisconnect,
                                                               bool initialize = false) {
            std::function<void(SocketConnection*)> oldOnDisconnect = this->onDisconnect;
 
            this->onDisconnect = initialize ? onDisconnect : [oldOnDisconnect, onDisconnect](SocketConnection* socketConnection) {
                oldOnDisconnect(socketConnection);
                onDisconnect(socketConnection);
            };
 
            return oldOnDisconnect;
        }
 
        std::shared_ptr<SocketContextFactory> getSocketContextFactory() {
            return socketContextFactory;
        }
 
    private:
        std::shared_ptr<SocketContextFactory> socketContextFactory;
 
        std::function<void(SocketConnection*)> onConnect;
        std::function<void(SocketConnection*)> onConnected;
        std::function<void(SocketConnection*)> onDisconnect;
    };
 
    template <typename SocketServer, typename... Args>
    SocketServer Server(const std::string& instanceName,
                        const std::function<void(typename SocketServer::Config&)>& configurator,
                        Args&&... socketContextFactoryArgs) {
        const SocketServer socketServer(instanceName, std::forward<Args>(socketContextFactoryArgs)...);
 
        configurator(socketServer.getConfig());
 
        return socketServer;
    }
 
    template <typename SocketServer, typename... Args>
    SocketServer Server(const std::string& instanceName, Args&&... socketContextFactoryArgs) {
        return SocketServer(instanceName, std::forward<Args>(socketContextFactoryArgs)...);
    }
 
} // namespace core::socket::stream
 
#endif // CORE_SOCKET_STREAM_SOCKETSERVERNEW_H