xbot/connection.hpp

#pragma once

#include "event.hpp"
#include "linebuffer.hpp"
#include "settings.hpp"

#include <eventpp/eventdispatcher.h>
#include <eventpp/utilities/argumentadapter.h>

#include <boost/asio.hpp>

#include <chrono>
#include <functional>
#include <concepts>
#include <iostream>
#include <list>
#include <memory>
#include <string>
#include <string_view>
#include <tuple>
#include <utility>
#include <variant>
#include <vector>
#include <typeinfo>
#include <typeindex>

struct ConnectEvent : Event
{
};

struct DisconnectEvent : Event
{
};

struct LineEvent : Event
{
    explicit LineEvent(char * line) : line{line} {}
    char * line;
};

class Connection : public std::enable_shared_from_this<Connection>
{
    using EventDispatcher = eventpp::EventDispatcher<std::type_index, void(Event&)>;

public:
    template <typename T>
    class Handle
    {
        EventDispatcher::Handle handle;
        Handle(EventDispatcher::Handle handle) : handle{handle} {}
    public:
        Handle() : handle{} {}
        friend Connection;
    };

private:
    boost::asio::ip::tcp::socket stream_;
    boost::asio::steady_timer write_timer_;
    std::list<std::string> write_strings_;
    EventDispatcher dispatcher_;

    auto writer() -> void;
    auto writer_() -> void;

public:
    Connection(boost::asio::io_context & io);

    template <typename T, typename F>
    auto add_listener(F f) -> Handle<T>
    {
        return Handle<T>{dispatcher_.appendListener(
            typeid(T),
            eventpp::argumentAdapter<void(T&)>(f)
        )};
    }

    template <typename T>
    auto remove_listener(Handle<T> handle) -> void
    {
        dispatcher_.removeListener(typeid(T), handle.handle);
    }

    template <typename T>
    auto dispatch(T& event) -> void
    {
        dispatcher_.dispatch(typeid(T), event);
    }

    auto get_executor() -> boost::asio::any_io_executor {
        return stream_.get_executor();
    }

    template <typename T, typename... Args>
    auto make_event(Args&& ... args) {
        auto event = T{std::forward<Args>(args)...};
        dispatch<T>(event);
    }

    /// Write bytes into the socket. Messages should be properly newline terminated.
    auto write_line(std::string message) -> void;

    auto connect(
        boost::asio::io_context & io,
        std::string host,
        std::string port
    ) -> boost::asio::awaitable<void>;

    auto close() -> void;
};