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construct/matrix/dbs_event_state.cc

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// 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.
namespace ircd::m::dbs
{
static bool event_state__cmp_lt(const string_view &, const string_view &);
}
decltype(ircd::m::dbs::event_state)
ircd::m::dbs::event_state;
decltype(ircd::m::dbs::desc::event_state__comp)
ircd::m::dbs::desc::event_state__comp
{
{ "name", "ircd.m.dbs._event_state.comp" },
{ "default", "default" },
};
decltype(ircd::m::dbs::desc::event_state__block__size)
ircd::m::dbs::desc::event_state__block__size
{
{ "name", "ircd.m.dbs._event_state.block.size" },
{ "default", 512L },
};
decltype(ircd::m::dbs::desc::event_state__meta_block__size)
ircd::m::dbs::desc::event_state__meta_block__size
{
{ "name", "ircd.m.dbs._event_state.meta_block.size" },
{ "default", long(2_KiB) },
};
decltype(ircd::m::dbs::desc::event_state__cache__size)
ircd::m::dbs::desc::event_state__cache__size
{
{
{ "name", "ircd.m.dbs._event_state.cache.size" },
{ "default", long(32_MiB) },
}, []
{
const size_t &value{event_state__cache__size};
db::capacity(db::cache(dbs::event_state), value);
}
};
decltype(ircd::m::dbs::desc::event_state__cache_comp__size)
ircd::m::dbs::desc::event_state__cache_comp__size
{
{
{ "name", "ircd.m.dbs._event_state.cache_comp.size" },
{ "default", long(0_MiB) },
}, []
{
const size_t &value{event_state__cache_comp__size};
db::capacity(db::cache_compressed(dbs::event_state), value);
}
};
const ircd::db::comparator
ircd::m::dbs::desc::event_state__cmp
{
"_event_state",
event_state__cmp_lt,
db::cmp_string_view::equal,
};
const ircd::db::descriptor
ircd::m::dbs::desc::event_state
{
.name = "_event_state",
.explain = R"(Index of states of events.
state_key, type, room_id, depth, event_idx => --
The state transitions of events are indexed by this column,
based on the state_key property.
)",
.type =
{
typeid(string_view), typeid(string_view)
},
.cmp = event_state__cmp,
.cache_size = bool(cache_enable)? -1 : 0, //uses conf item
.cache_size_comp = bool(cache_comp_enable)? -1 : 0,
.bloom_bits = 0,
.expect_queries_hit = false,
.block_size = size_t(event_state__block__size),
.meta_block_size = size_t(event_state__meta_block__size),
.compression = string_view{event_state__comp},
.compaction_pri = "kOldestSmallestSeqFirst"s,
};
//
// indexer
//
void
ircd::m::dbs::_index_event_state(db::txn &txn,
const event &event,
const write_opts &opts)
{
assert(opts.appendix.test(appendix::EVENT_STATE));
assert(json::get<"type"_>(event));
assert(opts.event_idx);
if(!defined(json::get<"state_key"_>(event)))
return;
thread_local char buf[EVENT_STATE_KEY_MAX_SIZE];
db::txn::append
{
txn, dbs::event_state,
{
opts.op, event_state_key(buf, event_state_tuple
{
at<"state_key"_>(event),
at<"type"_>(event),
at<"room_id"_>(event),
at<"depth"_>(event),
opts.event_idx,
})
}
};
}
//
// cmp
//
bool
ircd::m::dbs::event_state__cmp_lt(const string_view &a,
const string_view &b)
{
const auto &[state_key_a, type_a, room_id_a, depth_a, event_idx_a]
{
event_state_key(a)
};
const auto &[state_key_b, type_b, room_id_b, depth_b, event_idx_b]
{
event_state_key(b)
};
if(state_key_a != state_key_b)
return state_key_a < state_key_b;
if(type_a != type_b)
return type_a < type_b;
if(room_id_a != room_id_b)
return room_id_a < room_id_b;
if(depth_a != depth_b)
return depth_a > depth_b;
if(event_idx_a != event_idx_b)
return event_idx_a > event_idx_b;
return false;
}
//
// key
//
ircd::m::dbs::event_state_tuple
ircd::m::dbs::event_state_key(const string_view &amalgam)
{
assert(!startswith(amalgam, '\0'));
const auto &[state_key, r0]
{
split(amalgam, '\0')
};
const auto &[type, r1]
{
split(r0, '\0')
};
const auto &[room_id, r2]
{
split(r1, '\0')
};
assert(!room_id || m::valid(m::id::ROOM, room_id));
return event_state_tuple
{
state_key,
type,
room_id,
r2.size() >= 8?
int64_t(byte_view<int64_t>(r2.substr(0, 8))):
-1L,
r2.size() >= 16?
event::idx(byte_view<uint64_t>(r2.substr(8))):
0UL,
};
}
ircd::string_view
ircd::m::dbs::event_state_key(const mutable_buffer &out_,
const event_state_tuple &tuple)
{
assert(size(out_) >= EVENT_STATE_KEY_MAX_SIZE);
const auto &[state_key, type, room_id, depth, event_idx]
{
tuple
};
if(!state_key)
return {};
mutable_buffer out{out_};
consume(out, copy(out, trunc(state_key, event::STATE_KEY_MAX_SIZE)));
if(!type)
return {data(out_), data(out)};
consume(out, copy(out, '\0'));
consume(out, copy(out, trunc(type, event::TYPE_MAX_SIZE)));
if(!room_id)
return {data(out_), data(out)};
assert(m::valid(m::id::ROOM, room_id));
consume(out, copy(out, '\0'));
consume(out, copy(out, room_id));
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if(likely(depth < 0))
return {data(out_), data(out)};
consume(out, copy(out, '\0'));
consume(out, copy(out, byte_view<string_view>(depth)));
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if(likely(!event_idx))
return {data(out_), data(out)};
consume(out, copy(out, byte_view<string_view>(event_idx)));
return {data(out_), data(out)};
}