mirror of
https://github.com/matrix-construct/construct
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98 lines
2.7 KiB
C++
98 lines
2.7 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) 2016-2020 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_GOSSIP_H
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namespace ircd::m
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{
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struct gossip;
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}
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/// Matrix Gossip is a mechanism that proactively resolves the head (forward-
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/// extremities) of a room on remote servers by sending the events they are
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/// missing if we have them. Gossip may be performed multiple times, checking
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/// for changes in the remote head and repeating based on options or until
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/// completion.
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struct ircd::m::gossip
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:instance_list<ircd::m::gossip>
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{
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struct opts;
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struct result;
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static log::log log;
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const struct opts &opts;
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std::list<result> requests;
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std::set<uint128_t> attempts;
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private:
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bool full() const noexcept;
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bool started(const event::id &, const string_view &) const;
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bool handle(result &);
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bool handle();
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bool start(const event::id &, const string_view &);
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bool submit(const event::id &, const string_view &);
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bool handle_head(const m::event &);
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bool gossip_head();
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public:
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gossip(const struct opts &);
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gossip(const gossip &) = delete;
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gossip &operator=(const gossip &) = delete;
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~gossip() noexcept;
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};
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template<>
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decltype(ircd::m::gossip::list)
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ircd::instance_list<ircd::m::gossip>::list;
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struct ircd::m::gossip::opts
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{
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/// Room apropos; when room.event_id is true, only that event will be
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/// the subject of gossip and that is only if the remote's head requires
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/// it. room.event_id should not be given in most cases.
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m::room room;
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/// When hint_only=true this string is used to conduct gossip with the
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/// single remote given.
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string_view hint;
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/// Forces remote operations to the remote given in the hint only.
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bool hint_only {false};
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/// Depthwise window of gossip: no gossip for events outside of a given
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/// depth window. Ignored if !depth.second.
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pair<int64_t> depth {0, 0};
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/// Indexwise window of gossip: no gossip for events with a value outside
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/// of the window.
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pair<event::idx> ref {0, -1UL};
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/// The number of rounds the algorithm runs for.
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size_t rounds {-1UL};
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/// Total event limit over all operations.
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size_t max {-1UL};
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/// Limit the number of gossips in flight at any given time.
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size_t width {128};
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};
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struct ircd::m::gossip::result
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{
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unique_mutable_buffer buf;
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string_view txn;
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string_view txnid;
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string_view remote;
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event::id event_id;
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m::fed::send request;
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};
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