asio_include.hpp

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/*
    restinio
*/

/*!
    Selective include of asio/boost::asio.
*/

#pragma once

#if !defined(RESTINIO_USE_BOOST_ASIO)

// RESTinio uses stand-alone version of asio.
#include <asio.hpp>

namespace restinio
{
    namespace asio_ns = ::asio;

    //! @name Adoptation functions to cover differences between snad-alone and beast asio.
    ///@{
    inline bool error_is_operation_aborted( const asio_ns::error_code & ec )
    {
        return ec == asio_ns::error::operation_aborted;
    }

    inline bool error_is_eof( const asio_ns::error_code & ec )
    {
        return ec == asio_ns::error::eof;
    }
    ///@}

    namespace asio_ec
    {
        constexpr auto  eof = asio_ns::error::eof;
        inline const auto & system_category() { return asio_ns::system_category(); }
    } /* namespace err */
    //! \}

    //! An alias for base class of error category entity.
    using error_category_base_t = asio_ns::error_category;

// Define a proxy macro for having the same name for asio stand-alone and boost.
#define RESTINIO_ERROR_CATEGORY_NAME_NOEXCEPT ASIO_ERROR_CATEGORY_NOEXCEPT

} /* namespace restinio */

    #if defined(ASIO_HAS_WINDOWS_OVERLAPPED_PTR)
        // Define feature macro with the same name for stand-alone and boost asio.
        #define RESTINIO_ASIO_HAS_WINDOWS_OVERLAPPED_PTR
    #endif

#else

// RESTinio uses boost::asio.
#include <boost/asio.hpp>

namespace restinio
{

    namespace asio_ns
    {
        using namespace ::boost::asio;
        using error_code = ::boost::system::error_code;
    } /* namespace asio_ns */

    //! @name Adoptation functions to cover differences between snad-alone and beast asio.
    ///@{
    inline bool error_is_operation_aborted( const asio_ns::error_code & ec )
    {
        return ec == asio_ns::error::basic_errors::operation_aborted;
    }

    inline bool error_is_eof( const asio_ns::error_code & ec )
    {
        return ec == asio_ns::error::misc_errors::eof;
    }
    ///@}

    namespace asio_ec
    {
        constexpr auto eof = asio_ns::error::misc_errors::eof;

        inline const auto & system_category() { return ::boost::system::system_category(); }

    } /* namespace err */

    //! An alias for base class of error category entity.
    using error_category_base_t = ::boost::system::error_category;

    // Define a proxy macro for having the same name for asio stand-alone and boost.
    #define RESTINIO_ERROR_CATEGORY_NAME_NOEXCEPT BOOST_SYSTEM_NOEXCEPT

} /* namespace restinio */

    #if defined(BOOST_ASIO_HAS_WINDOWS_OVERLAPPED_PTR)
        // Define feature macro with the same name for stand-alone and boost asio.
        #define RESTINIO_ASIO_HAS_WINDOWS_OVERLAPPED_PTR
    #endif

#endif

namespace restinio
{


//! Enum for restinio errors that must presented as asio_ns::error_code value.
/*
    @since v.0.4.8
*/
enum class asio_convertible_error_t : int
{
    // Notificators error.

    //! After write notificator error: data was not sent,
    //! connection closed (or aborted) before a given piece of data.
    write_was_not_executed = 100,

    //! After write notificator error: a notificator was set for a write_group_t
    //! but no external invokation happened, so write_group_t destructor
    // calls it with error.
    write_group_destroyed_passively
};

namespace impl
{

//! Error category for asio compatible error codes.
/*
    @since v.0.4.8
*/
class restinio_err_category_t : public error_category_base_t
{
    public:
        virtual const char*
        name() const RESTINIO_ERROR_CATEGORY_NAME_NOEXCEPT override
        {
            return "restinio";
        }

        virtual std::string
        message( int value ) const override
        {
            std::string result{};
            switch( static_cast< asio_convertible_error_t >( value ) )
            {
                case asio_convertible_error_t::write_was_not_executed:
                    result.assign( "write operation was not" );
                    break;
                case asio_convertible_error_t::write_group_destroyed_passively:
                    result.assign(
                        "write group destroyed without external notificato invokation" );
                    break;
            }

            return result;
        }
};

} /* namespace impl */

//! Get restinio error category.
/*
    @since v.0.4.8
*/
inline const error_category_base_t &
restinio_err_category()
{
    static impl::restinio_err_category_t instance;
    return instance;
}

//! Make restinio error_code compatible with asio_ns::error_code.
/*
    @since v.0.4.8
*/
inline asio_ns::error_code
make_asio_compaible_error( asio_convertible_error_t err ) noexcept
{
    return asio_ns::error_code{ static_cast< int >( err ), restinio_err_category() };
}

} /* namespace restinio */