OVMS3-idf/examples/protocols/asio/chat_client/main/chat_client.cpp

165 lines
3.7 KiB
C++

//
// chat_client.cpp
// ~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2018 Christopher M. Kohlhoff (chris at kohlhoff dot com)
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#include <cstdlib>
#include <deque>
#include <iostream>
#include <thread>
#include "asio.hpp"
#include "chat_message.hpp"
using asio::ip::tcp;
typedef std::deque<chat_message> chat_message_queue;
class chat_client
{
public:
chat_client(asio::io_context& io_context,
const tcp::resolver::results_type& endpoints)
: io_context_(io_context),
socket_(io_context)
{
do_connect(endpoints);
}
void write(const chat_message& msg)
{
asio::post(io_context_,
[this, msg]()
{
bool write_in_progress = !write_msgs_.empty();
write_msgs_.push_back(msg);
if (!write_in_progress)
{
do_write();
}
});
}
void close()
{
asio::post(io_context_, [this]() { socket_.close(); });
}
private:
void do_connect(const tcp::resolver::results_type& endpoints)
{
asio::async_connect(socket_, endpoints,
[this](std::error_code ec, tcp::endpoint)
{
if (!ec)
{
do_read_header();
}
});
}
void do_read_header()
{
asio::async_read(socket_,
asio::buffer(read_msg_.data(), chat_message::header_length),
[this](std::error_code ec, std::size_t /*length*/)
{
if (!ec && read_msg_.decode_header())
{
do_read_body();
}
else
{
socket_.close();
}
});
}
void do_read_body()
{
asio::async_read(socket_,
asio::buffer(read_msg_.body(), read_msg_.body_length()),
[this](std::error_code ec, std::size_t /*length*/)
{
if (!ec)
{
std::cout.write(read_msg_.body(), read_msg_.body_length());
std::cout << "\n";
do_read_header();
}
else
{
socket_.close();
}
});
}
void do_write()
{
asio::async_write(socket_,
asio::buffer(write_msgs_.front().data(),
write_msgs_.front().length()),
[this](std::error_code ec, std::size_t /*length*/)
{
if (!ec)
{
write_msgs_.pop_front();
if (!write_msgs_.empty())
{
do_write();
}
}
else
{
socket_.close();
}
});
}
private:
asio::io_context& io_context_;
tcp::socket socket_;
chat_message read_msg_;
chat_message_queue write_msgs_;
};
void read_line(char * line, int max_chars);
void asio_main()
{
std::string name(CONFIG_EXAMPLE_SERVER_IP);
std::string port(CONFIG_EXAMPLE_PORT);
char line[chat_message::max_body_length + 1] = { 0 };
if (name == "FROM_STDIN") {
std::cout << "Please enter ip address of chat server" << std::endl;
if (std::cin.getline(line, chat_message::max_body_length + 1)) {
name = line;
std::cout << "Chat server IP:" << name << std::endl;
}
}
asio::io_context io_context;
tcp::resolver resolver(io_context);
auto endpoints = resolver.resolve(name, port);
chat_client c(io_context, endpoints);
std::thread t([&io_context](){ io_context.run(); });
while (std::cin.getline(line, chat_message::max_body_length + 1) && std::string(line) != "exit\n") {
chat_message msg;
msg.body_length(std::strlen(line));
std::memcpy(msg.body(), line, msg.body_length());
msg.encode_header();
c.write(msg);
}
c.close();
t.join();
}