sock.h

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// Copyright (c) 2020-2021 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
#ifndef BITCOIN_UTIL_SOCK_H
#define BITCOIN_UTIL_SOCK_H
 
#include <compat.h>
#include <threadinterrupt.h>
#include <util/time.h>
 
#include <chrono>
#include <string>
 
static constexpr auto MAX_WAIT_FOR_IO = 1s;
 
class Sock {
public:
    Sock();
 
    explicit Sock(SOCKET s);
 
    Sock(const Sock &) = delete;
 
    Sock(Sock &&other);
 
    virtual ~Sock();
 
    Sock &operator=(const Sock &) = delete;
 
    virtual Sock &operator=(Sock &&other);
 
    virtual SOCKET Get() const;
 
    virtual SOCKET Release();
 
    virtual void Reset();
 
    virtual ssize_t Send(const void *data, size_t len, int flags) const;
 
    virtual ssize_t Recv(void *buf, size_t len, int flags) const;
 
    virtual int Connect(const sockaddr *addr, socklen_t addr_len) const;
 
    virtual int GetSockOpt(int level, int opt_name, void *opt_val,
                           socklen_t *opt_len) const;
 
    using Event = uint8_t;
 
    static constexpr Event RECV = 0b01;
 
    static constexpr Event SEND = 0b10;
 
    virtual bool Wait(std::chrono::milliseconds timeout, Event requested,
                      Event *occurred = nullptr) const;
 
    /* Higher level, convenience, methods. These may throw. */
 
    virtual void SendComplete(const std::string &data,
                              std::chrono::milliseconds timeout,
                              CThreadInterrupt &interrupt) const;
 
    virtual std::string RecvUntilTerminator(uint8_t terminator,
                                            std::chrono::milliseconds timeout,
                                            CThreadInterrupt &interrupt,
                                            size_t max_data) const;
 
    virtual bool IsConnected(std::string &errmsg) const;
 
protected:
    SOCKET m_socket;
};
 
std::string NetworkErrorString(int err);
 
bool CloseSocket(SOCKET &hSocket);
 
#endif // BITCOIN_UTIL_SOCK_H