mirror of
https://github.com/matrix-construct/construct
synced 2024-11-17 07:20:55 +01:00
45 lines
1.7 KiB
C++
45 lines
1.7 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_EVENT_PURGE_H
|
|
|
|
//XXX fwd decl
|
|
namespace ircd::m::dbs
|
|
{
|
|
struct opts;
|
|
}
|
|
|
|
/// Erase an event from the database.
|
|
///
|
|
/// Purging an event will erase its data and metadata, including applying
|
|
/// reverse operations to restore the database state prior to the event's
|
|
/// acquisition. This allows the event to be reacquired without considering the
|
|
/// later eval to be a replay requiring an override. Take special care to
|
|
/// note that while the database will remain consistent after each purge, the
|
|
/// application logic may not, so be careful which events are purged. Further,
|
|
/// while the database will remain consistent after a later eval, such a
|
|
/// reevaluation is in fact a replay, and the extended effects of an event
|
|
/// were likely not reversed (nor cannot be reversed) by a purge, and its
|
|
/// revelation to clients may happen again unless prevented by the evaluator.
|
|
///
|
|
/// Overloads taking a db::txn will stage the erasure in the txn for the user
|
|
/// to commit later.
|
|
///
|
|
struct ircd::m::event::purge
|
|
:returns<bool>
|
|
{
|
|
purge(db::txn &, const event::idx &, const event &, dbs::opts);
|
|
purge(db::txn &, const event::idx &, const event &);
|
|
purge(db::txn &, const event::idx &, dbs::opts);
|
|
purge(db::txn &, const event::idx &);
|
|
purge(const event::idx &, dbs::opts);
|
|
purge(const event::idx &);
|
|
};
|