mirror of
https://github.com/matrix-construct/construct
synced 2024-11-06 22:08:52 +01:00
91 lines
3.1 KiB
C++
91 lines
3.1 KiB
C++
// Matrix Construct
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//
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// Copyright (C) Matrix Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2018 Jason Volk <jason@zemos.net>
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice is present in all copies. The
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// full license for this software is available in the LICENSE file.
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#pragma once
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#define HAVE_IRCD_NET_RESOLVER_H
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// This file is not included with the IRCd standard include stack because
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// it requires symbols we can't forward declare without boost headers. It
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// is part of the <ircd/asio.h> stack which can be included in your
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// definition file if you need low level access to this resolver API.
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/// Internal resolver service
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struct ircd::net::dns::resolver
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{
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struct tag;
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using header = rfc1035::header;
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static constexpr const size_t &MAX_COUNT{64};
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static conf::item<milliseconds> timeout;
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static conf::item<milliseconds> send_rate;
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std::vector<ip::udp::endpoint> server; // The list of active servers
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size_t server_next{0}; // Round-robin state to hit servers
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void init_servers();
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ctx::dock dock;
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std::map<uint16_t, tag> tags; // The active requests
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steady_point send_last; // Time of last send
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using queued = std::pair<uint16_t, std::string>;
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std::deque<queued> sendq; // Queue of frames for rate-limiting
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ip::udp::socket ns; // A pollable activity object
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ip::udp::endpoint reply_from; // Remote addr of recv
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char reply[64_KiB] alignas(16); // Buffer for recv
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bool handle_error(const error_code &ec) const;
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bool handle_error(const header &, const rfc1035::question &, const dns::opts &);
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void handle_reply(const header &, const const_buffer &body, tag &);
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void handle_reply(const header &, const const_buffer &body);
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void handle(const error_code &ec, const size_t &) noexcept;
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void set_handle();
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void queue_query(const const_buffer &, tag &);
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void send_query(const ip::udp::endpoint &, const const_buffer &, tag &);
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void send_query(const const_buffer &, tag &);
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void submit(const const_buffer &, tag &);
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tag &set_tag(tag &&);
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const_buffer make_query(const mutable_buffer &buf, const tag &) const;
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void operator()(const hostport &, const opts &, callback);
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bool check_timeout(const uint16_t &id, tag &, const steady_point &expired);
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void check_timeouts(const milliseconds &timeout);
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void timeout_worker();
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ctx::context timeout_context;
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void flush(const queued &);
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void sendq_worker();
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ctx::context sendq_context;
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resolver();
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~resolver() noexcept;
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};
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struct ircd::net::dns::resolver::tag
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{
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uint16_t id {0};
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hostport hp; // note: invalid after query sent
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dns::opts opts; // note: invalid after query sent
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callback cb;
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steady_point last;
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uint8_t tries {0};
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tag(const hostport &, const dns::opts &, callback);
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};
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inline
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ircd::net::dns::resolver::tag::tag(const hostport &hp,
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const dns::opts &opts,
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callback cb)
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:hp{hp}
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,opts{opts}
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,cb{std::move(cb)}
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{}
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