tcpsocket_p.h

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/*
    Copyright (C) 2022 by Pawel Soja <kernel32.pl@gmail.com>
 
    This library 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 2.1 of the License, or (at your option) any later version.
 
    This library 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 library; if not, write to the Free Software
    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
*/
#pragma once
 
#include "tcpsocket.h"
#include "select.h"
 
#include <fcntl.h>
#include <signal.h>
#include <cstring>
#include <cstdio>
 
#include <functional>
#include <mutex>
#include <thread>
#include <atomic>
#include <condition_variable>
 
class SocketAddress
{
    public:
        static const char *unixDomainPrefix;
 
    public:
        SocketAddress() = default;
        explicit SocketAddress(const std::string &hostName, unsigned short port);
 
    public:
        static bool isUnix(const std::string &hostName);
 
    public:
        bool isValid() const
        {
            return data() != nullptr;
        }
 
        const struct sockaddr *data() const
        {
            return mData.get();
        }
 
        size_t size() const
        {
            return mSize;
        }
 
    public:
        const struct sockaddr *operator&() const
        {
            return data();
        }
 
    protected:
        static SocketAddress afInet(const std::string &hostName, unsigned short port);
        static SocketAddress afUnix(const std::string &hostName);
 
    protected:
        std::unique_ptr<struct sockaddr> mData;
        size_t mSize;
};
 
class TcpSocketPrivate
{
    public:
        TcpSocketPrivate(TcpSocket *parent);
        virtual ~TcpSocketPrivate() = default;
 
    public: // platform dependent
        bool createSocket(int domain);
        void closeSocket();
        ssize_t recvSocket(void *dst, size_t size);
        ssize_t sendSocket(const void *src, size_t size);
        bool setNonblockSocket();
 
    public: // low level helpers
        bool connectSocket(const std::string &hostName, unsigned short port);
        bool waitForConnectedSockets();
        bool processSocket();
 
    public: // TcpSocketPrivate API
        ssize_t write(const void *data, size_t size);
 
        void connectToHost(const std::string &hostName, unsigned short port);
        void aboutToClose();
 
        void joinThread(std::thread &thread);
 
    public:
        enum ErrorType
        {
            ErrorTypeSystem,
            ErrorTypeInternal
        };
        void setSocketError(TcpSocket::SocketError error, ErrorType errorType = ErrorTypeSystem,
                            const std::string &errorString = "");
        void setSocketState(TcpSocket::SocketState state);
 
    public:
        TcpSocket *parent;
        SocketFileDescriptor socketFd = SocketInvalid;
        Select select;
        int timeout{30000};
 
        std::thread thread;
        std::atomic<bool> isAboutToClose{false};
 
        mutable std::mutex socketStateMutex;
        mutable std::condition_variable socketStateChanged;
 
        std::atomic<TcpSocket::SocketState> socketState{TcpSocket::UnconnectedState};
        TcpSocket::SocketError socketError;
        std::string errorString;
 
        // events
        std::function<void()> onConnected;
        std::function<void()> onDisconnected;
        std::function<void(const char *, size_t)> onData;
        std::function<void(TcpSocket::SocketError)> onErrorOccurred;
};