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construct/include/ircd/m/room/state_fetch.h

54 lines
1.7 KiB
C++

// The Construct
//
// Copyright (C) The Construct Developers, Authors & Contributors
// Copyright (C) 2016-2020 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_STATE_FETCH_H
/// Fetch and determine the latest head information from all servers.
struct ircd::m::room::state::fetch
{
struct opts;
using closure = std::function<bool (const m::event::id &, const string_view &)>;
static conf::item<milliseconds> timeout;
/// Count of responding servers.
size_t respond {0};
/// Total number of states reported from all servers (including duplicates)
size_t responses {0};
/// Total number of concurrences for non-existent states.
size_t concur {0};
/// Total number of concurrences for existing states.
size_t exists {0};
/// Running (and final) results when opts.unique=true; otherwise the
/// closure is the only way to receive results.
std::set<event::id::buf, std::less<>> result;
// Primary operation; synchronous construction with results provided to
// closure asynchronously.
fetch(const opts &, const closure & = {});
};
struct ircd::m::room::state::fetch::opts
{
/// Room apropos.
m::room room;
/// When true, results are stored in the result set and duplicate results
/// are not provided to the closure. When false, the result set is not used.
bool unique {true};
/// When true, results may include events this server already has executed.
bool existing {false};
};