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construct/matrix/dbs_room_state.cc

234 lines
5.1 KiB
C++

// 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.
decltype(ircd::m::dbs::room_state)
ircd::m::dbs::room_state;
decltype(ircd::m::dbs::desc::room_state__block__size)
ircd::m::dbs::desc::room_state__block__size
{
{ "name", "ircd.m.dbs._room_state.block.size" },
{ "default", 512L },
};
decltype(ircd::m::dbs::desc::room_state__meta_block__size)
ircd::m::dbs::desc::room_state__meta_block__size
{
{ "name", "ircd.m.dbs._room_state.meta_block.size" },
{ "default", 8192L },
};
decltype(ircd::m::dbs::desc::room_state__cache__size)
ircd::m::dbs::desc::room_state__cache__size
{
{
{ "name", "ircd.m.dbs._room_state.cache.size" },
{ "default", long(16_MiB) },
}, []
{
const size_t &value{room_state__cache__size};
db::capacity(db::cache(dbs::room_state), value);
}
};
decltype(ircd::m::dbs::desc::room_state__cache_comp__size)
ircd::m::dbs::desc::room_state__cache_comp__size
{
{
{ "name", "ircd.m.dbs._room_state.cache_comp.size" },
{ "default", long(8_MiB) },
}, []
{
const size_t &value{room_state__cache_comp__size};
db::capacity(db::cache_compressed(dbs::room_state), value);
}
};
decltype(ircd::m::dbs::desc::room_state__bloom__bits)
ircd::m::dbs::desc::room_state__bloom__bits
{
{ "name", "ircd.m.dbs._room_state.bloom.bits" },
{ "default", 10L },
};
/// prefix transform for type,state_key in room_id
///
/// This transform is special for concatenating room_id with type and state_key
/// in that order with prefix being the room_id (this may change to room_id+
/// type
///
const ircd::db::prefix_transform
ircd::m::dbs::desc::room_state__pfx
{
"_room_state",
[](const string_view &key)
{
return has(key, "\0"_sv);
},
[](const string_view &key)
{
return split(key, '\0').first;
}
};
const ircd::db::descriptor
ircd::m::dbs::desc::room_state
{
// name
"_room_state",
// explanation
R"(The present state of the room.
[room_id | type + state_key] => event_idx
This column is also known as the "present state table." It contains the
very important present state of the room for this server. The key contains
plaintext room_id, type and state_key elements for direct point-lookup as
well as iteration. The value is the index of the apropos state event.
)",
// typing (key, value)
{
typeid(string_view), typeid(uint64_t)
},
// options
{},
// comparator
{},
// prefix transform
room_state__pfx,
// drop column
false,
// cache size
bool(cache_enable)? -1 : 0,
// cache size for compressed assets
bool(cache_comp_enable)? -1 : 0,
// bloom filter bits
size_t(room_state__bloom__bits),
// expect queries hit
false,
// block size
size_t(room_state__block__size),
// meta_block size
size_t(room_state__meta_block__size),
// compression
"kLZ4Compression;kSnappyCompression"s,
// compactor
{},
// compaction priority algorithm
"kOldestSmallestSeqFirst"s,
};
//
// indexer
//
void
ircd::m::dbs::_index_room_state(db::txn &txn,
const event &event,
const write_opts &opts)
{
assert(opts.appendix.test(appendix::ROOM_STATE));
const ctx::critical_assertion ca;
thread_local char buf[ROOM_STATE_KEY_MAX_SIZE];
const string_view &key
{
room_state_key(buf, at<"room_id"_>(event), at<"type"_>(event), at<"state_key"_>(event))
};
const string_view val
{
byte_view<string_view>(opts.event_idx)
};
db::txn::append
{
txn, room_state,
{
opts.op,
key,
value_required(opts.op)? val : string_view{},
}
};
}
//
// key
//
ircd::string_view
ircd::m::dbs::room_state_key(const mutable_buffer &out_,
const id::room &room_id,
const string_view &type)
{
return room_state_key(out_, room_id, type, string_view{});
}
ircd::string_view
ircd::m::dbs::room_state_key(const mutable_buffer &out_,
const id::room &room_id,
const string_view &type,
const string_view &state_key)
{
mutable_buffer out{out_};
consume(out, copy(out, room_id));
assert(room_id);
if(likely(defined(type)))
{
consume(out, copy(out, '\0'));
consume(out, copy(out, trunc(type, event::TYPE_MAX_SIZE)));
}
if(defined(state_key))
{
consume(out, copy(out, '\0'));
consume(out, copy(out, trunc(state_key, event::STATE_KEY_MAX_SIZE)));
}
return { data(out_), data(out) };
}
std::tuple<ircd::string_view, ircd::string_view>
ircd::m::dbs::room_state_key(const string_view &amalgam)
{
const auto &key
{
lstrip(amalgam, '\0')
};
const auto &s
{
split(key, '\0')
};
return
{
s.first, s.second
};
}