SocketAcceptor.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
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 * This program is free software: you can redistribute it and/or modify
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 */
 
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 * MIT License
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#include "core/State.h"
#include "core/socket/stream/SocketAcceptor.h"
 
#ifndef DOXYGEN_SHOULD_SKIP_THIS
 
#include "log/Logger.h"
#include "utils/PreserveErrno.h"
 
#include <iomanip>
#include <string>
#include <utility>
 
#endif // DOXYGEN_SHOULD_SKIP_THIS
 
namespace core::socket::stream {
 
    template <typename PhysicalSocketServer,
              typename Config,
              template <typename ConfigT, typename PhysicalSocketServerT> typename SocketConnection>
    SocketAcceptor<PhysicalSocketServer, Config, SocketConnection>::SocketAcceptor(
        const std::function<void(SocketConnection*)>& onConnect,
        const std::function<void(SocketConnection*)>& onConnected,
        const std::function<void(SocketConnection*)>& onDisconnect,
        const std::function<void(const SocketAddress&, core::socket::State)>& onStatus,
        const std::shared_ptr<Config>& config)
        : core::eventreceiver::AcceptEventReceiver(config->getInstanceName() + " SocketAcceptor", 0)
        , onConnect(onConnect)
        , onConnected(onConnected)
        , onDisconnect(onDisconnect)
        , onStatus(onStatus)
        , config(config) {
    }
 
    template <typename PhysicalSocketServer,
              typename Config,
              template <typename ConfigT, typename PhysicalSocketServerT> typename SocketConnection>
    SocketAcceptor<PhysicalSocketServer, Config, SocketConnection>::SocketAcceptor(const SocketAcceptor& socketAcceptor)
        : core::eventreceiver::AcceptEventReceiver(socketAcceptor.config->getInstanceName() + " SocketAcceptor", 0)
        , onConnect(socketAcceptor.onConnect)
        , onConnected(socketAcceptor.onConnected)
        , onDisconnect(socketAcceptor.onDisconnect)
        , onStatus(socketAcceptor.onStatus)
        , config(socketAcceptor.config) {
    }
 
    template <typename PhysicalSocketServer,
              typename Config,
              template <typename ConfigT, typename PhysicalSocketServerT> typename SocketConnection>
    SocketAcceptor<PhysicalSocketServer, Config, SocketConnection>::~SocketAcceptor() {
    }
 
    template <typename PhysicalSocketServer,
              typename Config,
              template <typename ConfigT, typename PhysicalSocketServerT> typename SocketConnection>
    void SocketAcceptor<PhysicalSocketServer, Config, SocketConnection>::init() {
        if (!config->getDisabled()) {
            try {
                core::socket::State state = core::socket::STATE_OK;
 
                LOG(DEBUG) << config->getInstanceName() << " Listen: starting";
 
                bindAddress = config->Local::getSocketAddress();
 
                if (physicalServerSocket.open(config->getSocketOptions(), PhysicalServerSocket::Flags::NONBLOCK) < 0) {
                    PLOG(ERROR) << config->getInstanceName() << " open " << bindAddress.toString();
 
                    switch (errno) {
                        case EMFILE:
                        case ENFILE:
                        case ENOBUFS:
                        case ENOMEM:
                            state = core::socket::STATE_ERROR;
                            break;
                        default:
                            state = core::socket::STATE_FATAL;
                            break;
                    }
                } else {
                    LOG(DEBUG) << config->getInstanceName() << " open " << bindAddress.toString() << ": success";
 
                    if (physicalServerSocket.bind(bindAddress) < 0) {
                        PLOG(ERROR) << config->getInstanceName() << " bind " << bindAddress.toString();
 
                        switch (errno) {
                            case EADDRINUSE:
 
                                state = core::socket::STATE_ERROR;
                                break;
                            default:
 
                                state = core::socket::STATE_FATAL;
                                break;
                        }
                    } else {
                        LOG(DEBUG) << config->getInstanceName() << " bind " << bindAddress.toString() << ": success";
 
                        if (physicalServerSocket.listen(config->getBacklog()) < 0) {
                            PLOG(ERROR) << config->getInstanceName() << " listen " << bindAddress.toString();
 
                            switch (errno) {
                                case EADDRINUSE:
                                    state = core::socket::STATE_ERROR;
                                    break;
                                default:
                                    state = core::socket::STATE_FATAL;
                                    break;
                            }
                        } else {
                            LOG(DEBUG) << config->getInstanceName() << " listen " << bindAddress.toString() << ": success";
 
                            if (enable(physicalServerSocket.getFd())) {
                                LOG(DEBUG) << config->getInstanceName() << " enable " << bindAddress.toString() << ": success";
                            } else {
                                LOG(ERROR) << config->getInstanceName() << " enable " << bindAddress.toString()
                                           << ": failed. No valid descriptor created";
 
                                state = core::socket::STATE(core::socket::STATE_FATAL, ECANCELED, "SocketAcceptor not enabled");
                            }
                        }
                    }
                }
 
                SocketAddress currentLocalAddress = bindAddress;
                if (bindAddress.useNext()) {
                    onStatus(currentLocalAddress, (state | core::socket::State::NO_RETRY));
 
                    LOG(INFO) << config->getInstanceName()
                              << ": Using next SocketAddress: " << config->Local::getSocketAddress().toString();
 
                    useNextSocketAddress();
                } else {
                    onStatus(currentLocalAddress, state);
                }
            } catch (const typename SocketAddress::BadSocketAddress& badSocketAddress) {
                core::socket::State state =
                    core::socket::STATE(badSocketAddress.getState(), badSocketAddress.getErrnum(), badSocketAddress.what());
 
                LOG(ERROR) << state.what();
 
                onStatus({}, state);
            }
        } else {
            LOG(DEBUG) << config->getInstanceName() << ": disabled";
 
            onStatus({}, core::socket::STATE_DISABLED);
        }
 
        if (isEnabled()) {
            core::eventreceiver::AcceptEventReceiver::setTimeout(config->getAcceptTimeout());
        } else {
            destruct();
        }
    }
 
    template <typename PhysicalSocketServer,
              typename Config,
              template <typename ConfigT, typename PhysicalSocketServerT> typename SocketConnection>
    void SocketAcceptor<PhysicalSocketServer, Config, SocketConnection>::acceptEvent() {
        int acceptsPerTick = config->getAcceptsPerTick();
 
        do {
            PhysicalServerSocket connectedPhysicalSocket(physicalServerSocket.accept4(PhysicalServerSocket::Flags::NONBLOCK), bindAddress);
 
            if (connectedPhysicalSocket.isValid()) {
                SocketConnection* socketConnection = new SocketConnection(std::move(connectedPhysicalSocket), onDisconnect, config);
 
                LOG(DEBUG) << config->getInstanceName() << " accept " << bindAddress.toString() << ": success";
                LOG(DEBUG) << "  " << socketConnection->getRemoteAddress().toString() << " -> "
                           << socketConnection->getLocalAddress().toString();
 
                onConnect(socketConnection);
                onConnected(socketConnection);
            } else if (errno != EINTR && errno != EAGAIN && errno != EWOULDBLOCK) {
                PLOG(WARNING) << config->getInstanceName() << " accept " << bindAddress.toString();
            }
        } while (--acceptsPerTick > 0);
    }
 
    template <typename PhysicalSocketServer,
              typename Config,
              template <typename ConfigT, typename PhysicalSocketServerT> typename SocketConnection>
    void SocketAcceptor<PhysicalSocketServer, Config, SocketConnection>::unobservedEvent() {
        destruct();
    }
 
    template <typename PhysicalSocketServer,
              typename Config,
              template <typename ConfigT, typename PhysicalSocketServerT> typename SocketConnection>
    void SocketAcceptor<PhysicalSocketServer, Config, SocketConnection>::destruct() {
        delete this;
    }
 
} // namespace core::socket::stream