message.cpp

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#include <charconv>
#include <cassert>
#include <cstring>
#include <iostream>
#include "message.hpp"
 
std::string_view Message::getStr() const{
        return std::string_view(data + headerSize, size);
}
 
void Message::async_readMsg(asio::ip::tcp::socket& socket,
                CompletionCallback onComplete)
{
        using namespace std::placeholders;
        asio::async_read(socket,
                        asio::buffer(data, headerSize),
                        std::bind(&Message::async_readBody,
                                this, std::ref(socket), onComplete, _1, _2));
}
 
void Message::setStr(std::string_view msg){
        assert(!sendingNow);
        size = std::min(bodySize, msg.size());
 
        memset(data, ' ', headerSize);
        std::to_chars(data, data + headerSize, size);
 
        memcpy(data + headerSize, msg.data(), size);
}
 
void Message::async_sendMsg(asio::ip::tcp::socket& socket,
                CompletionCallback onComplete)
{
        using namespace std::placeholders;
        sendingNow = true;
        asio::async_write(socket,
                        asio::buffer(data, headerSize + size),
                        std::bind(&Message::async_sendComplete,
                                this, onComplete, _1, _2));
}
 
void Message::async_readBody(asio::ip::tcp::socket& socket,
                CompletionCallback onComplete,
                const asio::error_code& ec, [[maybe_unused]] size_t readLen)
{
        if(ec){
                std::cerr << "Msg error " << ec.message() << "\n";
                onComplete(ec == asio::error::eof ?
                                CompletionStatus::UnexpectedDisconnect : CompletionStatus::Error);
                return;
        }
 
        assert(readLen == headerSize);
        size_t expectedSize = 0;
 
        auto res = std::from_chars(data, data + headerSize, expectedSize);
        if(res.ec != std::errc()){
                onComplete(CompletionStatus::Error);
                return;
        }
 
        using namespace std::placeholders;
        asio::async_read(socket,
                        asio::buffer(data + headerSize, expectedSize),
                        std::bind(&Message::async_readBodyComplete,
                                this, onComplete, _1, _2));
 
}
 
void Message::async_readBodyComplete(CompletionCallback onComplete,
                const std::error_code& ec, size_t readLen)
{
        if(ec){
                std::cerr << "Msg error: " << ec.message() << "\n";
                onComplete(ec == asio::error::eof ?
                                CompletionStatus::UnexpectedDisconnect : CompletionStatus::Error);
                return;
        }
 
        size = readLen;
 
        onComplete(CompletionStatus::Success);
}
 
void Message::async_sendComplete(CompletionCallback onComplete,
                const std::error_code& ec, [[maybe_unused]] size_t sentLen)
{
        sendingNow = false;
        onComplete(!ec ? CompletionStatus::Success : CompletionStatus::Error);
}