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57 lines
1.4 KiB
C++
57 lines
1.4 KiB
C++
// Copyright 2016, Tao An. All rights reserved.
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//
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// Use of this source code is governed by a BSD-style license
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// that can be found in the License file.
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// Author: Tao An
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#pragma once
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#include <trantor/exports.h>
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#include <memory>
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#include <trantor/net/EventLoop.h>
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#include <trantor/net/InetAddress.h>
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namespace trantor
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{
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/**
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* @brief This class represents an asynchronous DNS resolver.
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* @note Although the c-ares library is not essential, it is recommended to
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* install it for higher performance
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*/
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class TRANTOR_EXPORT Resolver
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{
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public:
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using Callback = std::function<void(const trantor::InetAddress&)>;
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/**
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* @brief Create a new DNS resolver.
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*
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* @param loop The event loop in which the DNS resolver runs.
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* @param timeout The timeout in seconds for DNS.
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* @return std::shared_ptr<Resolver>
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*/
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static std::shared_ptr<Resolver> newResolver(EventLoop* loop = nullptr,
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size_t timeout = 60);
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/**
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* @brief Resolve an address asynchronously.
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*
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* @param hostname
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* @param callback
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*/
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virtual void resolve(const std::string& hostname,
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const Callback& callback) = 0;
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virtual ~Resolver()
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{
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}
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/**
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* @brief Check whether the c-ares library is used.
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*
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* @return true
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* @return false
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*/
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static bool isCAresUsed();
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};
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} // namespace trantor
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