mirror of
https://github.com/matrix-construct/construct
synced 2024-12-25 15:04:10 +01:00
234 lines
5.1 KiB
C++
234 lines
5.1 KiB
C++
// The Construct
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//
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// Copyright (C) The Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2020 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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decltype(ircd::m::dbs::room_state)
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ircd::m::dbs::room_state;
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decltype(ircd::m::dbs::desc::room_state__block__size)
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ircd::m::dbs::desc::room_state__block__size
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{
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{ "name", "ircd.m.dbs._room_state.block.size" },
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{ "default", 512L },
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};
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decltype(ircd::m::dbs::desc::room_state__meta_block__size)
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ircd::m::dbs::desc::room_state__meta_block__size
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{
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{ "name", "ircd.m.dbs._room_state.meta_block.size" },
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{ "default", 8192L },
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};
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decltype(ircd::m::dbs::desc::room_state__cache__size)
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ircd::m::dbs::desc::room_state__cache__size
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{
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{
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{ "name", "ircd.m.dbs._room_state.cache.size" },
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{ "default", long(16_MiB) },
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}, []
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{
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const size_t &value{room_state__cache__size};
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db::capacity(db::cache(dbs::room_state), value);
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}
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};
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decltype(ircd::m::dbs::desc::room_state__cache_comp__size)
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ircd::m::dbs::desc::room_state__cache_comp__size
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{
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{
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{ "name", "ircd.m.dbs._room_state.cache_comp.size" },
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{ "default", long(8_MiB) },
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}, []
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{
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const size_t &value{room_state__cache_comp__size};
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db::capacity(db::cache_compressed(dbs::room_state), value);
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}
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};
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decltype(ircd::m::dbs::desc::room_state__bloom__bits)
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ircd::m::dbs::desc::room_state__bloom__bits
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{
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{ "name", "ircd.m.dbs._room_state.bloom.bits" },
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{ "default", 10L },
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};
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/// prefix transform for type,state_key in room_id
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///
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/// This transform is special for concatenating room_id with type and state_key
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/// in that order with prefix being the room_id (this may change to room_id+
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/// type
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///
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const ircd::db::prefix_transform
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ircd::m::dbs::desc::room_state__pfx
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{
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"_room_state",
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[](const string_view &key)
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{
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return has(key, "\0"_sv);
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},
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[](const string_view &key)
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{
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return split(key, '\0').first;
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}
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};
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const ircd::db::descriptor
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ircd::m::dbs::desc::room_state
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{
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// name
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"_room_state",
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// explanation
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R"(The present state of the room.
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[room_id | type + state_key] => event_idx
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This column is also known as the "present state table." It contains the
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very important present state of the room for this server. The key contains
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plaintext room_id, type and state_key elements for direct point-lookup as
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well as iteration. The value is the index of the apropos state event.
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)",
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// typing (key, value)
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{
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typeid(string_view), typeid(uint64_t)
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},
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// options
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{},
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// comparator
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{},
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// prefix transform
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room_state__pfx,
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// drop column
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false,
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// cache size
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bool(cache_enable)? -1 : 0,
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// cache size for compressed assets
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bool(cache_comp_enable)? -1 : 0,
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// bloom filter bits
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size_t(room_state__bloom__bits),
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// expect queries hit
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false,
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// block size
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size_t(room_state__block__size),
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// meta_block size
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size_t(room_state__meta_block__size),
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// compression
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"kLZ4Compression;kSnappyCompression"s,
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// compactor
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{},
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// compaction priority algorithm
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"kOldestSmallestSeqFirst"s,
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};
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//
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// indexer
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//
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void
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ircd::m::dbs::_index_room_state(db::txn &txn,
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const event &event,
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const write_opts &opts)
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{
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assert(opts.appendix.test(appendix::ROOM_STATE));
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const ctx::critical_assertion ca;
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thread_local char buf[ROOM_STATE_KEY_MAX_SIZE];
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const string_view &key
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{
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room_state_key(buf, at<"room_id"_>(event), at<"type"_>(event), at<"state_key"_>(event))
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};
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const string_view val
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{
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byte_view<string_view>(opts.event_idx)
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};
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db::txn::append
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{
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txn, room_state,
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{
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opts.op,
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key,
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value_required(opts.op)? val : string_view{},
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}
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};
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}
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//
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// key
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//
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ircd::string_view
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ircd::m::dbs::room_state_key(const mutable_buffer &out_,
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const id::room &room_id,
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const string_view &type)
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{
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return room_state_key(out_, room_id, type, string_view{});
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}
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ircd::string_view
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ircd::m::dbs::room_state_key(const mutable_buffer &out_,
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const id::room &room_id,
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const string_view &type,
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const string_view &state_key)
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{
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mutable_buffer out{out_};
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consume(out, copy(out, room_id));
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assert(room_id);
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if(likely(defined(type)))
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{
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consume(out, copy(out, '\0'));
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consume(out, copy(out, trunc(type, event::TYPE_MAX_SIZE)));
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}
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if(defined(state_key))
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{
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consume(out, copy(out, '\0'));
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consume(out, copy(out, trunc(state_key, event::STATE_KEY_MAX_SIZE)));
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}
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return { data(out_), data(out) };
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}
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std::tuple<ircd::string_view, ircd::string_view>
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ircd::m::dbs::room_state_key(const string_view &amalgam)
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{
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const auto &key
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{
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lstrip(amalgam, '\0')
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};
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const auto &s
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{
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split(key, '\0')
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};
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return
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{
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s.first, s.second
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};
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}
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