mirror of
https://github.com/matrix-construct/construct
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83 lines
2.6 KiB
C++
83 lines
2.6 KiB
C++
// The Construct
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//
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// Copyright (C) The Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2019 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_M_FED_WELL_KNOWN_H
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/// well-known for server name resolution.
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///
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/// This is a future-based interface. It performs local caching in the !dns
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/// room as well as conducting network requests. The cache is queried on the
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/// callers ircd::ctx and valid results cheaply return an already-satisfied
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/// future. In the case of expired or missing results, a request structure is
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/// allocated and managed internally and an unsatisfied future is returned;
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/// an internal worker will resolve the promise asynchronously.
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///
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namespace ircd::m::fed::well_known
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{
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struct request;
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struct opts;
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// Primary query interface
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ctx::future<string_view>
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get(const mutable_buffer &out, const string_view &name, const opts &);
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extern conf::item<seconds> cache_max;
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extern conf::item<seconds> cache_error;
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extern conf::item<seconds> cache_default;
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}
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/// Options used for resolving well-known.
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struct ircd::m::fed::well_known::opts
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{
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/// Whether to check the cache before making any request.
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bool cache_check {true};
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/// Allow expired cache results to be returned without making any refresh.
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bool expired {false};
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/// Allow a query to be made to a remote.
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bool request {true};
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/// Whether to cache the result of any request.
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bool cache_result {true};
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};
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/// Internal request structure; do not instantiate or manage manually. The
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/// request::list allows traversal of all requests and observation of their
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/// state.
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struct ircd::m::fed::well_known::request
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:instance_list<request>
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{
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static const string_view path, type;
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static const server::request::opts sopts;
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static conf::item<size_t> redirects_max;
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static conf::item<seconds> timeout;
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static ctx::mutex mutex;
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static uint64_t id_ctr;
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mutable_buffer out; // only safe if promise valid
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string_view target;
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well_known::opts opts;
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uint64_t id {++id_ctr};
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system_point expires;
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ctx::promise<string_view> promise;
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unique_mutable_buffer carry;
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rfc3986::uri uri;
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server::request req;
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http::code code {0};
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http::response::head head;
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string_view location;
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size_t redirects {0};
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json::object response;
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json::string m_server;
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char tgtbuf[2][rfc3986::REMOTE_BUFSIZE];
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char buf[15_KiB];
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};
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