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module;
#include <asio.hpp>
#include <expected>
#include <format>
#include <string>
export module ttwhy:io;
namespace ttwhy::io
{
export template<typename Stream>
auto handle_signals(Stream & stream) -> asio::awaitable<std::error_code>
{
auto executor = co_await asio::this_coro::executor;
auto signals = asio::signal_set{executor, SIGINT, SIGTERM};
auto [error, signal] = co_await signals.async_wait(asio::as_tuple(asio::use_awaitable));
if (!error)
{
auto message = std::format("Received signal {}, exiting ...\n", signal);
co_await asio::async_write(stream, asio::buffer(message), asio::use_awaitable);
}
co_return error;
}
export template<typename InputStream, typename ErrorStream>
auto read(std::span<char> data, InputStream & input_stream, ErrorStream & error_stream)
-> asio::awaitable<std::expected<std::size_t, asio::error_code>>
{
auto [error, read] = co_await input_stream.async_read_some(asio::buffer(data), asio::as_tuple(asio::use_awaitable));
if (error)
{
auto message = std::format("{}, exiting ...\n", error.message());
co_await asio::async_write(error_stream, asio::buffer(message), asio::use_awaitable);
co_return std::unexpected{error};
}
co_return read;
}
export template<typename OutputStream, typename ErrorStream>
auto write(std::span<char const> string, OutputStream & output_stream, ErrorStream & error_stream)
-> asio::awaitable<asio::error_code>
{
auto [error, written] =
co_await asio::async_write(output_stream, asio::buffer(string), asio::as_tuple(asio::use_awaitable));
if (error)
{
auto message = std::format("{}, exiting ...\n", error.message());
co_await asio::async_write(error_stream, asio::buffer(message), asio::use_awaitable);
}
co_return error;
}
export template<typename InputStream, typename OutputStream, typename ErrorStream>
auto echo(InputStream & input_stream, OutputStream & output_stream, ErrorStream & error_stream)
-> asio::awaitable<asio::error_code>
{
auto input = std::array<char, 16>{};
while (true)
{
auto read_result = co_await read(input, input_stream, error_stream);
if (!read_result.has_value())
{
co_return read_result.error();
}
auto to_write = std::span{input.data(), read_result.value()};
auto write_error = co_await write(to_write, output_stream, error_stream);
if (write_error)
{
co_return write_error;
}
}
}
} // namespace ttwhy::io
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