mirror of
https://github.com/matrix-construct/construct
synced 2024-11-12 13:01:07 +01:00
62 lines
2.5 KiB
C++
62 lines
2.5 KiB
C++
// Matrix Construct
|
|
//
|
|
// Copyright (C) Matrix Construct Developers, Authors & Contributors
|
|
// Copyright (C) 2016-2023 Jason Volk <jason@zemos.net>
|
|
//
|
|
// Permission to use, copy, modify, and/or distribute this software for any
|
|
// purpose with or without fee is hereby granted, provided that the above
|
|
// copyright notice and this permission notice is present in all copies. The
|
|
// full license for this software is available in the LICENSE file.
|
|
|
|
#pragma once
|
|
#define HAVE_IRCD_M_ROOM_EVENTS_SOUNDING_H
|
|
|
|
// The "viewport" is comprised of events starting from the tophead (most recent
|
|
// in room timeline) and covering about ~20 events leading up to that. Note
|
|
// that this is a completely ad hoc and configurable server value. Events in
|
|
// the viewport must be eval'ed and synced to clients in the order they will
|
|
// be displayed. Events not in the viewport are not /synced to clients and any
|
|
// client request provides event ordering: thus older events (backfills, etc)
|
|
// can be eval'ed without this constraint.
|
|
//
|
|
// The "sounding" is the depth of the first gap. In any attempt to trace
|
|
// the room timeline from the tophead to the m.room.create event: the sounding
|
|
// is the [highest number] depth preventing that.
|
|
//
|
|
// The "twain" marks the depth at the end of the first gap; the server is in
|
|
// possession of one or more events again at the twain.
|
|
//
|
|
// The "hazard" is the depth of the first gap starting from the m.room.create
|
|
// event toward the tophead. In any attempt to trace the room timeline with
|
|
// an increasing depth, the hazard is the next gap to frontfill.
|
|
|
|
namespace ircd::m
|
|
{
|
|
std::pair<int64_t, event::idx> viewport(const room &);
|
|
std::pair<int64_t, event::idx> sounding(const room &); // Last missing (one)
|
|
std::pair<int64_t, event::idx> twain(const room &);
|
|
std::pair<int64_t, event::idx> hazard(const room &); // First missing (one)
|
|
}
|
|
|
|
/// Find gaps in the room's events. A gap is where this server has no events
|
|
/// at a certain depth. This is a path-finding diagnostic interface, useful to
|
|
/// understand what areas of the timeline have not been acquired by the server
|
|
/// to calculate backfill requests, etc. This interface is depth-first oriented,
|
|
/// rather than the breadth-first room::missing interface.
|
|
///
|
|
struct ircd::m::room::events::sounding
|
|
{
|
|
using range = std::pair<int64_t, int64_t>;
|
|
using closure = std::function<bool (const range &, const event::idx &)>;
|
|
|
|
m::room room;
|
|
|
|
public:
|
|
bool for_each(const closure &) const;
|
|
bool rfor_each(const closure &) const;
|
|
|
|
sounding() = default;
|
|
sounding(const m::room &room)
|
|
:room{room}
|
|
{}
|
|
};
|