trick/trick_sims/SIM_billiards/models/graphics/cpp/Socket.cpp

#include "Socket.hh"

#define SOCKET_BUF_SIZE 20480

Socket::Socket() : _initialized(false) {}

int Socket::init (std::string hostname, int port) {
    _hostname = hostname;
    _port = port;
    _socket_fd = socket(AF_INET, SOCK_STREAM, 0);
    if (_socket_fd < 0) {
        std::cout << "Socket connection failed" << std::endl;
        return -1;
    }

    struct sockaddr_in serv_addr;
    serv_addr.sin_family = AF_INET;
    serv_addr.sin_port = htons(port); // convert to weird network byte format

    if(inet_pton(AF_INET, "127.0.0.1", &serv_addr.sin_addr)<=0) { 
        std::cout << "Invalid address/ Address not supported" << std::endl; 
        return -1;
    } 

    if (connect(_socket_fd, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) < 0) {
        std::cout << "Connection failed" << std::endl;
        return -1;
    }

    _initialized = true;
}

int Socket::send (std::string message) {
    // weird syntax I've never used before - since the send syscall that i'm trying to use is overloaded in this class,
    // I have to append :: to the front of it so that the compiler knows to look in the global namespace
    int success = ::send(_socket_fd, message.c_str(), message.size(), 0);
    if (success < message.size()) {
        std::cout << "Failed to send message" << std::endl;
    }
    return success;
}

int Socket::operator<< (std::string message) {
    return send(message);
}

std::string Socket::receive () {
    char buffer[SOCKET_BUF_SIZE];
    int numBytes = read(_socket_fd, buffer, SOCKET_BUF_SIZE);
    if (numBytes < 0) {
        std::cout << "Failed to read from socket" << std::endl;
    } else if (numBytes < SOCKET_BUF_SIZE) {
        buffer[numBytes] = '\0';
    }

    return std::string(buffer);
}

void Socket::operator>> (std::string& ret) {
    ret = receive();
}