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construct/matrix/event_horizon.cc

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// Matrix Construct
//
// Copyright (C) Matrix Construct Developers, Authors & Contributors
// Copyright (C) 2016-2019 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.
//TODO: XXX remove fwd decl
namespace ircd::m::dbs
{
void _index_event_horizon(db::txn &, const event &, const write_opts &, const m::event::id &);
}
size_t
ircd::m::event::horizon::rebuild()
{
m::dbs::write_opts opts;
opts.appendix.reset();
opts.appendix.set(dbs::appendix::EVENT_HORIZON);
db::txn txn
{
*dbs::events
};
size_t ret(0);
m::events::for_each({0UL, -1UL}, [&ret, &txn, &opts]
(const m::event::idx &event_idx, const m::event &event)
{
const m::event::prev prev
{
event
};
m::for_each(prev, [&ret, &txn, &opts, &event_idx, &event]
(const m::event::id &event_id)
{
if(m::exists(event_id))
return true;
opts.event_idx = event_idx;
m::dbs::_index_event_horizon(txn, event, opts, event_id);
if(++ret % 1024 == 0)
log::info
{
m::log, "event::horizon rebuild @ %lu/%lu",
event_idx,
m::vm::sequence::retired,
};
return true;
});
return true;
});
txn();
return ret;
}
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bool
ircd::m::event::horizon::has(const event::id &event_id)
{
char buf[m::dbs::EVENT_HORIZON_KEY_MAX_SIZE];
const string_view &key
{
m::dbs::event_horizon_key(buf, event_id, 0UL)
};
auto it
{
m::dbs::event_horizon.begin(key)
};
return bool(it);
}
size_t
ircd::m::event::horizon::count()
const
{
size_t ret(0);
for_each([&ret]
(const auto &, const auto &) noexcept
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{
++ret;
return true;
});
return ret;
}
bool
ircd::m::event::horizon::has(const event::idx &event_idx)
const
{
return !for_each([&event_idx]
(const auto &, const auto &_event_idx) noexcept
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{
// false to break; true to continue.
return _event_idx == event_idx? false : true;
});
}
bool
ircd::m::event::horizon::for_each(const closure_bool &closure)
const
{
if(!this->event_id)
return for_every(closure);
char buf[m::dbs::EVENT_HORIZON_KEY_MAX_SIZE];
const string_view &key
{
m::dbs::event_horizon_key(buf, event_id, 0UL)
};
for(auto it(m::dbs::event_horizon.begin(key)); it; ++it)
{
const auto &event_idx
{
std::get<0>(m::dbs::event_horizon_key(it->first))
};
if(!closure(event_id, event_idx))
return false;
}
return true;
}
bool
ircd::m::event::horizon::for_every(const closure_bool &closure)
{
db::column &column{dbs::event_horizon};
for(auto it(column.begin()); it; ++it)
{
const auto &parts
{
split(it->first, "\0"_sv)
};
const auto &event_id
{
parts.first
};
const auto &event_idx
{
byte_view<event::idx>(parts.second)
};
if(!closure(event_id, event_idx))
return false;
}
return true;
}