mirror of
https://github.com/matrix-construct/construct
synced 2024-07-07 02:58:39 +02:00
92 lines
3.6 KiB
C++
92 lines
3.6 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_M_ROOM_MESSAGES_H
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namespace ircd::m
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{
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// [GET] Count the events in the room between two indexes.
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// Note the range here is unusual: The start index is exclusive, the ending
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// index is inclusive. The start index must be valid and in the room.
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size_t count_since(const room &, const m::event::idx &, const m::event::idx &);
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size_t count_since(const room &, const m::event::id &, const m::event::id &);
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size_t count_since(const m::event::idx &, const m::event::idx &);
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size_t count_since(const m::event::id &, const m::event::id &);
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// [GET] Find gaps in the room's event graph. A gap is where no events
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// have been obtained at that depth. Each gap is reported to the closure
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// with a separate invocation. The range is [inclusive, exclusive].
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using depth_range = std::pair<int64_t, int64_t>;
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using depth_range_closure = std::function<bool (const depth_range &, const event::idx &)>;
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bool for_each_depth_gap(const room &, const depth_range_closure &);
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bool rfor_each_depth_gap(const room &, const depth_range_closure &);
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bool sounding(const room &, const depth_range_closure &); // Last missing (all)
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std::pair<int64_t, event::idx> hazard(const room &); // First missing (one)
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std::pair<int64_t, event::idx> sounding(const room &); // Last missing (one)
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std::pair<int64_t, event::idx> twain(const room &);
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}
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/// Interface to room messages
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///
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/// This interface has the form of an STL-style iterator over room messages
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/// which are state and non-state events from all integrated timelines.
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/// Moving the iterator is cheap, but the dereference operators fetch a
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/// full event. One can iterate just event_idx's by using event_idx() instead
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/// of the dereference operators.
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///
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struct ircd::m::room::messages
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{
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m::room room;
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db::index::const_iterator it;
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event::fetch _event;
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public:
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operator bool() const { return bool(it); }
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bool operator!() const { return !it; }
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event::id::buf event_id() const; // deprecated; will remove
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event::idx event_idx() const; // Available from the iterator key.
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uint64_t depth() const; // Available from the iterator key.
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string_view state_root() const; // Available from the iterator value.
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explicit operator event::idx() const;
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const m::event &fetch(std::nothrow_t);
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const m::event &fetch();
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bool seek_idx(const event::idx &);
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bool seek(const uint64_t &depth = -1);
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bool seek(const event::id &);
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// These are reversed on purpose
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auto &operator++() { return --it; }
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auto &operator--() { return ++it; }
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const m::event &operator*();
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const m::event *operator->() { return &operator*(); }
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messages(const m::room &room,
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const uint64_t &depth,
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const event::fetch::opts *const & = nullptr);
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messages(const m::room &room,
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const event::id &,
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const event::fetch::opts *const & = nullptr);
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messages(const m::room &room,
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const event::fetch::opts *const & = nullptr);
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messages() = default;
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messages(const messages &) = delete;
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messages &operator=(const messages &) = delete;
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};
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