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construct/matrix/trace.cc

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// Matrix Construct
//
// Copyright (C) The Construct Developers, Authors & Contributors
// Copyright (C) 2016-2022 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.
bool
ircd::m::trace::for_each(const event::idx &event_idx,
const closure &closure)
{
event::fetch event
{
std::nothrow, event_idx
};
if(!event.valid)
return true;
if(redacted(event))
return true;
room::messages messages
{
room::id{json::get<"room_id"_>(event)},
{
json::get<"depth"_>(event), -1L
}
};
bool ret(true), loop; do
{
loop = false;
messages.for_each([&closure, &event, &messages, &loop, &ret]
(const room::message &msg, const int64_t &depth, const event::idx &event_idx)
{
// Ignore messages at the same depth as the initial
if(event.event_idx != event_idx && depth == json::get<"depth"_>(event))
return true;
// Call user; check if they want to break iteration
if(!(ret = closure(event_idx, depth, msg)))
return false;
const auto reply_to_id
{
msg.reply_to_event()
};
// If this is not a reply continue to the prior message.
if(!reply_to_id)
return true;
// If we don't have the message being replied to, break here
if(!seek(std::nothrow, event, reply_to_id))
return false;
// The message replied to was redacted, break here.
if(redacted(event))
return false;
// Jump to the message being replied to
messages =
{
room::id{json::get<"room_id"_>(event)},
{
json::get<"depth"_>(event), -1L
}
};
loop = true;
return false;
});
}
while(ret && loop);
return ret;
}