Resolver.hpp

#pragma once
 
#include <boost/asio.hpp>
#include <boost/asio/io_context.hpp>
#include <boost/asio/ip/tcp.hpp>
 
#include <concepts>
#include <string>
#include <string_view>
#include <vector>
 
namespace web {

template <typename T>
concept SomeResolver = requires(T t) {
    std::is_default_constructible_v<T>;
    { t.resolve(std::string_view{}, std::string_view{}) } -> std::same_as<std::vector<std::string>>;
    { t.resolve(std::string_view{}) } -> std::same_as<std::vector<std::string>>;
};

class Resolver {
    boost::asio::io_context ioContext_;
    boost::asio::ip::tcp::resolver resolver_{ioContext_};
 
public:
    std::vector<std::string>
    resolve(std::string_view hostname);

    std::vector<std::string>
    resolve(std::string_view hostname, std::string_view service);
 
private:
    std::vector<boost::asio::ip::tcp::endpoint>
    doResolve(std::string_view hostname, std::string_view service);
};
 
}  // namespace web