squeezelite-esp32/components/spotify/cspot/bell/main/io/include/TCPSocket.h

#ifndef BELL_BASIC_SOCKET_H
#define BELL_BASIC_SOCKET_H

#include <ctype.h>
#include <stdlib.h>
#include <sys/types.h>
#include <cstring>
#include <iostream>
#include <memory>
#include <string>
#include <vector>
#include "BellSocket.h"
#ifdef _WIN32
#include <winsock2.h>
#include <ws2tcpip.h>
#include "win32shim.h"
#else
#include <netdb.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <unistd.h>
#ifdef __sun
#include <sys/filio.h>
#endif
#endif
#include <BellLogger.h>
#include <fstream>
#include <sstream>

namespace bell {
class TCPSocket : public bell::Socket {
 private:
  int sockFd;
  bool isClosed = true;

 public:
  TCPSocket(){};
  ~TCPSocket() { close(); };

  int getFd() { return sockFd; }

  void open(const std::string& host, uint16_t port) {
    int err;
    int domain = AF_INET;
    int socketType = SOCK_STREAM;

    struct addrinfo hints {
    }, *addr;
    //fine-tune hints according to which socket you want to open
    hints.ai_family = domain;
    hints.ai_socktype = socketType;
    hints.ai_protocol =
        IPPROTO_IP;  // no enum : possible value can be read in /etc/protocols
    hints.ai_flags = AI_CANONNAME | AI_ALL | AI_ADDRCONFIG;

    // BELL_LOG(info, "http", "%s %d", host.c_str(), port);

    char portStr[6];
    sprintf(portStr, "%u", port);
    err = getaddrinfo(host.c_str(), portStr, &hints, &addr);
    if (err != 0) {
      throw std::runtime_error("Resolve failed");
    }

    sockFd = socket(addr->ai_family, addr->ai_socktype, addr->ai_protocol);

    err = connect(sockFd, addr->ai_addr, addr->ai_addrlen);
    if (err < 0) {
      close();
      BELL_LOG(error, "http", "Could not connect to %s. Error %d", host.c_str(),
               errno);
      throw std::runtime_error("Resolve failed");
    }

    int flag = 1;
    setsockopt(sockFd,       /* socket affected */
               IPPROTO_TCP,  /* set option at TCP level */
               TCP_NODELAY,  /* name of option */
               (char*)&flag, /* the cast is historical cruft */
               sizeof(int)); /* length of option value */

    freeaddrinfo(addr);
    isClosed = false;
  }

  size_t read(uint8_t* buf, size_t len) {
    return recv(sockFd, (char*)buf, len, 0);
  }

  size_t write(uint8_t* buf, size_t len) {
    return send(sockFd, (char*)buf, len, 0);
  }

  size_t poll() {
#ifdef _WIN32
    unsigned long value;
    ioctlsocket(sockFd, FIONREAD, &value);
#else
    int value;
    ioctl(sockFd, FIONREAD, &value);
#endif
    return value;
  }
  bool isOpen() {
    return !isClosed;
  }

  void close() {
    if (!isClosed) {
#ifdef _WIN32
      closesocket(sockFd);
#else
      ::close(sockFd);
#endif
      sockFd = -1;
      isClosed = true;
    }
  }
};

}  // namespace bell

#endif