mirror of
https://github.com/matrix-construct/construct
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45 lines
1.7 KiB
C++
45 lines
1.7 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) 2016-2023 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_EVENT_PURGE_H
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//XXX fwd decl
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namespace ircd::m::dbs
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{
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struct opts;
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}
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/// Erase an event from the database.
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///
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/// Purging an event will erase its data and metadata, including applying
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/// reverse operations to restore the database state prior to the event's
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/// acquisition. This allows the event to be reacquired without considering the
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/// later eval to be a replay requiring an override. Take special care to
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/// note that while the database will remain consistent after each purge, the
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/// application logic may not, so be careful which events are purged. Further,
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/// while the database will remain consistent after a later eval, such a
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/// reevaluation is in fact a replay, and the extended effects of an event
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/// were likely not reversed (nor cannot be reversed) by a purge, and its
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/// revelation to clients may happen again unless prevented by the evaluator.
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///
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/// Overloads taking a db::txn will stage the erasure in the txn for the user
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/// to commit later.
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///
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struct ircd::m::event::purge
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:returns<bool>
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{
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purge(db::txn &, const event::idx &, const event &, dbs::opts);
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purge(db::txn &, const event::idx &, const event &);
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purge(db::txn &, const event::idx &, dbs::opts);
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purge(db::txn &, const event::idx &);
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purge(const event::idx &, dbs::opts);
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purge(const event::idx &);
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};
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