mirror of
https://github.com/matrix-construct/construct
synced 2024-11-25 16:22:35 +01:00
330 lines
8.1 KiB
C++
330 lines
8.1 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::event_horizon)
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ircd::m::dbs::event_horizon;
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decltype(ircd::m::dbs::desc::event_horizon__comp)
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ircd::m::dbs::desc::event_horizon__comp
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{
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{ "name", "ircd.m.dbs._event_horizon.comp" },
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{ "default", "default" },
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};
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decltype(ircd::m::dbs::desc::event_horizon__block__size)
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ircd::m::dbs::desc::event_horizon__block__size
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{
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{ "name", "ircd.m.dbs._event_horizon.block.size" },
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{ "default", 512L },
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};
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decltype(ircd::m::dbs::desc::event_horizon__meta_block__size)
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ircd::m::dbs::desc::event_horizon__meta_block__size
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{
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{ "name", "ircd.m.dbs._event_horizon.meta_block.size" },
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{ "default", 1024L },
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};
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decltype(ircd::m::dbs::desc::event_horizon__cache__size)
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ircd::m::dbs::desc::event_horizon__cache__size
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{
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{
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{ "name", "ircd.m.dbs._event_horizon.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{event_horizon__cache__size};
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db::capacity(db::cache(dbs::event_horizon), value);
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}
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};
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decltype(ircd::m::dbs::desc::event_horizon__cache_comp__size)
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ircd::m::dbs::desc::event_horizon__cache_comp__size
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{
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{
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{ "name", "ircd.m.dbs._event_horizon.cache_comp.size" },
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{ "default", long(0_MiB) },
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}, []
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{
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const size_t &value{event_horizon__cache_comp__size};
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db::capacity(db::cache_compressed(dbs::event_horizon), value);
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}
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};
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const ircd::db::prefix_transform
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ircd::m::dbs::desc::event_horizon__pfx
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{
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"_event_horizon",
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[](const string_view &key)
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{
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return has(key, '\0');
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},
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[](const string_view &key)
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{
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assert(size(key) >= sizeof(event::idx));
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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::event_horizon
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{
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.name = "_event_horizon",
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.explain = R"(Unresolved references in the reverse reference graph of events.
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event_id | event_idx => --
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The first part of the key is an event_id which the server does not have.
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The suffix of the key is the index number of an event which the server
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does have and it contains a reference to event_id.
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We use the information in this column to find all of the events which
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have an unresolved reference to this event and complete the holes in the
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event_refs graph which could not be completed without this event.
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When a new event is written to the database the event_horizon column is
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queried seeking the event's ID. Each entry in event_horizon is the index
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of an event which we previously wrote to the database without knowing the
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index of the event currently being written (an out-of-order write).
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)",
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.type =
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{
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typeid(string_view), typeid(string_view)
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},
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.prefix = event_horizon__pfx,
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.cache_size = bool(cache_enable)? -1 : 0, //uses conf item
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.cache_size_comp = bool(cache_comp_enable)? -1 : 0,
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.bloom_bits = 0,
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.expect_queries_hit = false,
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.block_size = size_t(event_horizon__block__size),
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.meta_block_size = size_t(event_horizon__meta_block__size),
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.compression = string_view{event_horizon__comp},
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.compaction_pri = "kOldestSmallestSeqFirst"s,
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};
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//
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// indexer
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//
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namespace ircd::m::dbs
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{
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static void _index_event_horizon_resolve_one(db::txn &, const event &, const write_opts &, const event::idx &);
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}
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// NOTE: QUERY
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void
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ircd::m::dbs::_index_event_horizon_resolve(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::EVENT_HORIZON_RESOLVE));
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assert(opts.event_idx != 0);
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assert(event.event_id);
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char buf[EVENT_HORIZON_KEY_MAX_SIZE];
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const string_view &key
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{
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event_horizon_key(buf, event.event_id)
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};
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auto it(dbs::event_horizon.begin(key)); do
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{
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static const size_t max{32};
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size_t num(0);
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event::idx event_idx[max];
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for(; num < max && it; ++it)
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{
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event_idx[num] = std::get<0>(event_horizon_key(it->first));
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num += event_idx[num] != 0;
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}
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for(size_t i(0); i < num; ++i)
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_index_event_horizon_resolve_one(txn, event, opts, event_idx[i]);
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}
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while(it);
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}
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size_t
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ircd::m::dbs::_prefetch_event_horizon_resolve(const event &event,
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const write_opts &opts)
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{
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assert(opts.appendix.test(appendix::EVENT_HORIZON_RESOLVE));
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size_t ret(0);
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if(!event.event_id)
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return ret;
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char buf[EVENT_HORIZON_KEY_MAX_SIZE];
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assert(event.event_id);
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const string_view &key
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{
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event_horizon_key(buf, event.event_id)
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};
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for(auto it(dbs::event_horizon.begin(key)); it; ++it)
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{
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const auto event_idx
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{
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std::get<0>(event_horizon_key(it->first))
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};
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ret += m::prefetch(event_idx);
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}
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return ret;
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}
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// NOTE: QUERY
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void
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ircd::m::dbs::_index_event_horizon_resolve_one(db::txn &txn,
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const event &event,
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const write_opts &opts,
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const event::idx &event_idx)
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{
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assert(event_idx != 0);
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assert(event_idx != opts.event_idx);
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const event::fetch _event
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{
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std::nothrow, event_idx
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};
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if(!_event.valid)
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{
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log::dwarning
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{
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log, "Horizon resolve for %s @%lu not possible @%lu",
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string_view{event.event_id},
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opts.event_idx,
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event_idx,
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};
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return;
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}
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log::debug
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{
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log, "Horizon resolve for %s @%lu; remisé %s @%lu",
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string_view{event.event_id},
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opts.event_idx,
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string_view{_event.event_id},
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event_idx,
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};
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// Make the references on behalf of the future event
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write_opts _opts;
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_opts.op = opts.op;
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_opts.event_idx = event_idx;
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_opts.appendix.reset();
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_opts.appendix.set(appendix::EVENT_REFS, opts.appendix[appendix::EVENT_REFS]);
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_opts.appendix.set(appendix::ROOM_REDACT, opts.appendix[appendix::ROOM_REDACT]);
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_opts.appendix.set(appendix::ROOM_HEAD_RESOLVE, opts.appendix[appendix::ROOM_HEAD_RESOLVE]);
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_opts.event_refs = opts.horizon_resolve;
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_opts.interpose = &txn;
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write(txn, _event, _opts);
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// Delete the event_horizon entry after resolving.
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thread_local char buf[EVENT_HORIZON_KEY_MAX_SIZE];
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const string_view &key
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{
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event_horizon_key(buf, event.event_id, event_idx)
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};
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db::txn::append
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{
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txn, dbs::event_horizon,
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{
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opts.op == db::op::SET?
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db::op::DELETE:
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db::op::SET,
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key
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}
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};
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}
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void
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ircd::m::dbs::_index_event_horizon(db::txn &txn,
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const event &event,
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const write_opts &opts,
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const m::event::id &unresolved_id)
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{
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thread_local char buf[EVENT_HORIZON_KEY_MAX_SIZE];
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assert(opts.appendix.test(appendix::EVENT_HORIZON));
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assert(opts.event_idx != 0 && unresolved_id);
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const string_view &key
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{
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event_horizon_key(buf, unresolved_id, opts.event_idx)
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};
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db::txn::append
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{
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txn, dbs::event_horizon,
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{
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opts.op, key
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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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std::tuple<ircd::m::event::idx>
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ircd::m::dbs::event_horizon_key(const string_view &amalgam)
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{
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assert(size(amalgam) == 1 + sizeof(event::idx));
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assert(amalgam[0] == '\0');
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const byte_view<event::idx> &event_idx
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{
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amalgam.substr(1)
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};
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return
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{
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static_cast<event::idx>(event_idx)
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};
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}
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ircd::string_view
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ircd::m::dbs::event_horizon_key(const mutable_buffer &out,
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const event::id &event_id)
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{
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return event_horizon_key(out, event_id, 0UL);
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}
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ircd::string_view
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ircd::m::dbs::event_horizon_key(const mutable_buffer &out,
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const event::id &event_id,
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const event::idx &event_idx)
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{
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mutable_buffer buf(out);
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consume(buf, copy(buf, event_id));
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if(event_idx)
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{
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consume(buf, copy(buf, '\0'));
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consume(buf, copy(buf, byte_view<string_view>(event_idx)));
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}
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const string_view ret
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{
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data(out), data(buf)
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};
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assert(size(ret) == size(event_id) || size(ret) == size(event_id) + sizeof(event::idx) + 1);
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return ret;
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}
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