mirror of
https://github.com/matrix-construct/construct
synced 2024-12-02 03:32:52 +01:00
98 lines
2.7 KiB
C++
98 lines
2.7 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_GOSSIP_H
|
|
|
|
namespace ircd::m
|
|
{
|
|
struct gossip;
|
|
}
|
|
|
|
/// Matrix Gossip is a mechanism that proactively resolves the head (forward-
|
|
/// extremities) of a room on remote servers by sending the events they are
|
|
/// missing if we have them. Gossip may be performed multiple times, checking
|
|
/// for changes in the remote head and repeating based on options or until
|
|
/// completion.
|
|
struct ircd::m::gossip
|
|
:instance_list<ircd::m::gossip>
|
|
{
|
|
struct opts;
|
|
struct result;
|
|
|
|
static log::log log;
|
|
|
|
const struct opts &opts;
|
|
std::list<result> requests;
|
|
std::set<uint128_t> attempts;
|
|
|
|
private:
|
|
bool full() const noexcept;
|
|
bool started(const event::id &, const string_view &) const;
|
|
|
|
bool handle(result &);
|
|
bool handle();
|
|
bool start(const event::id &, const string_view &);
|
|
bool submit(const event::id &, const string_view &);
|
|
bool handle_head(const m::event &);
|
|
bool gossip_head();
|
|
|
|
public:
|
|
gossip(const struct opts &);
|
|
gossip(const gossip &) = delete;
|
|
gossip &operator=(const gossip &) = delete;
|
|
~gossip() noexcept;
|
|
};
|
|
|
|
template<>
|
|
decltype(ircd::m::gossip::list)
|
|
ircd::instance_list<ircd::m::gossip>::list;
|
|
|
|
struct ircd::m::gossip::opts
|
|
{
|
|
/// Room apropos; when room.event_id is true, only that event will be
|
|
/// the subject of gossip and that is only if the remote's head requires
|
|
/// it. room.event_id should not be given in most cases.
|
|
m::room room;
|
|
|
|
/// When hint_only=true this string is used to conduct gossip with the
|
|
/// single remote given.
|
|
string_view hint;
|
|
|
|
/// Forces remote operations to the remote given in the hint only.
|
|
bool hint_only {false};
|
|
|
|
/// Depthwise window of gossip: no gossip for events outside of a given
|
|
/// depth window. Ignored if !depth.second.
|
|
pair<int64_t> depth {0, 0};
|
|
|
|
/// Indexwise window of gossip: no gossip for events with a value outside
|
|
/// of the window.
|
|
pair<event::idx> ref {0, -1UL};
|
|
|
|
/// The number of rounds the algorithm runs for.
|
|
size_t rounds {-1UL};
|
|
|
|
/// Total event limit over all operations.
|
|
size_t max {-1UL};
|
|
|
|
/// Limit the number of gossips in flight at any given time.
|
|
size_t width {128};
|
|
};
|
|
|
|
struct ircd::m::gossip::result
|
|
{
|
|
unique_mutable_buffer buf;
|
|
string_view txn;
|
|
string_view txnid;
|
|
string_view remote;
|
|
event::id event_id;
|
|
m::fed::send request;
|
|
};
|