76 lines
1.9 KiB
C++
76 lines
1.9 KiB
C++
//
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// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2020
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#pragma once
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#include "td/actor/actor.h"
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#include "td/actor/PromiseFuture.h"
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#include "td/utils/logging.h"
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#include "td/utils/port/IPAddress.h"
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#include "td/utils/Status.h"
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#include <unordered_map>
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#include <utility>
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namespace td {
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extern int VERBOSITY_NAME(dns_resolver);
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class GetHostByNameActor final : public Actor {
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public:
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enum class ResolverType { Native, Google };
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struct Options {
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static constexpr int32 DEFAULT_CACHE_TIME = 60 * 29; // 29 minutes
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static constexpr int32 DEFAULT_ERROR_CACHE_TIME = 60 * 5; // 5 minutes
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vector<ResolverType> resolver_types{ResolverType::Native};
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int32 scheduler_id{-1};
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int32 ok_timeout{DEFAULT_CACHE_TIME};
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int32 error_timeout{DEFAULT_ERROR_CACHE_TIME};
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};
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explicit GetHostByNameActor(Options options);
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void run(std::string host, int port, bool prefer_ipv6, Promise<IPAddress> promise);
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private:
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void on_query_result(std::string host, bool prefer_ipv6, Result<IPAddress> result);
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struct Value {
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Result<IPAddress> ip;
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double expires_at;
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Value(Result<IPAddress> ip, double expires_at) : ip(std::move(ip)), expires_at(expires_at) {
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}
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Result<IPAddress> get_ip_port(int port) const {
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auto result = ip.clone();
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if (result.is_ok()) {
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result.ok_ref().set_port(port);
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}
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return result;
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}
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};
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std::unordered_map<string, Value> cache_[2];
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struct Query {
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ActorOwn<> query;
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size_t pos = 0;
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string real_host;
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double begin_time;
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std::vector<std::pair<int, Promise<IPAddress>>> promises;
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};
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std::unordered_map<string, Query> active_queries_[2];
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Options options_;
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void run_query(std::string host, bool prefer_ipv6, Query &query);
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};
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} // namespace td
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