mirror of
https://github.com/matrix-construct/construct
synced 2024-12-29 08:54:02 +01:00
1146 lines
23 KiB
C++
1146 lines
23 KiB
C++
// Matrix Construct
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//
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// Copyright (C) Matrix Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2018 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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#include <ircd/m/m.h>
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/// Residence of the events database instance pointer.
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decltype(ircd::m::dbs::events)
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ircd::m::dbs::events
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{};
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/// Linkage for a cache of the columns of the events database which directly
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/// correspond to a property in the matrix event object. This array allows
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/// for constant time access to a column the same way one can make constant
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/// time access to a property in m::event.
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decltype(ircd::m::dbs::event_column)
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ircd::m::dbs::event_column
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{};
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/// Linkage for a reference to the state_node column.
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decltype(ircd::m::dbs::state_node)
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ircd::m::dbs::state_node
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{};
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/// Linkage for a reference to the room_events column
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decltype(ircd::m::dbs::room_events)
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ircd::m::dbs::room_events
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{};
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//
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// init
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//
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/// Initializes the m::dbs subsystem; sets up the events database. Held/called
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/// by m::init. Most of the extern variables in m::dbs are not ready until
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/// this call completes.
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ircd::m::dbs::init::init()
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{
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// Open the events database
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events = std::make_shared<database>("events"s, ""s, desc::events);
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// Cache the columns for the event tuple in order for constant time lookup
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assert(event_columns == event::size());
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std::array<string_view, event::size()> keys; //TODO: why did this happen?
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_key_transform(event{}, begin(keys), end(keys)); //TODO: how did this happen?
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for(size_t i(0); i < keys.size(); ++i)
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event_column[i] = db::column
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{
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*events, keys[i]
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};
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// Cache the columns for the metadata
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state_node = db::column{*events, "_state_node"};
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room_events = db::index{*events, "_room_events"};
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}
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/// Shuts down the m::dbs subsystem; closes the events database. The extern
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/// variables in m::dbs will no longer be functioning after this call.
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ircd::m::dbs::init::~init()
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noexcept
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{
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// Columns should be unrefed before DB closes
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state_node = {};
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room_events = {};
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for(auto &column : event_column)
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column = {};
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// Unref DB (should close)
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events = {};
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}
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namespace ircd::m::dbs
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{
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static void _index__room_events(db::txn &, const string_view &state_root, const event &);
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static string_view _index_state(db::txn &, const mutable_buffer &root_out, const string_view &state_root, const event &);
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static string_view _index_ephem(db::txn &, const string_view &state_root, const event &);
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}
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ircd::string_view
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ircd::m::dbs::write(db::txn &txn,
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const mutable_buffer &root_out,
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const string_view &root_in,
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const event &event)
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{
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db::txn::append
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{
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txn, at<"event_id"_>(event), event
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};
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if(defined(json::get<"state_key"_>(event)))
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return _index_state(txn, root_out, root_in, event);
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return _index_ephem(txn, root_in, event);
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}
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ircd::string_view
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ircd::m::dbs::_index_ephem(db::txn &txn,
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const string_view &state_root_in,
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const event &event)
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{
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_index__room_events(txn, state_root_in, event);
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return state_root_in;
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}
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ircd::string_view
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ircd::m::dbs::_index_state(db::txn &txn,
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const mutable_buffer &state_root_out,
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const string_view &state_root_in,
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const event &event)
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try
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{
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const auto &type
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{
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at<"type"_>(event)
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};
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const auto &room_id
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{
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at<"room_id"_>(event)
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};
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const string_view new_root
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{
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state::insert(txn, state_root_out, state_root_in, event)
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};
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_index__room_events(txn, new_root, event);
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return new_root;
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}
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catch(const std::exception &e)
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{
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log::error
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{
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"Failed to update state: %s", e.what()
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};
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throw;
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}
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/// Adds the entry for the room_events column into the txn.
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/// You need find/create the right state_root before this.
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void
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ircd::m::dbs::_index__room_events(db::txn &txn,
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const string_view &state_root,
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const event &event)
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{
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const ctx::critical_assertion ca;
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thread_local char buf[768];
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const string_view &key
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{
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room_events_key(buf, at<"room_id"_>(event), at<"depth"_>(event), at<"event_id"_>(event))
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};
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db::txn::append
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{
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txn, room_events,
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{
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key, // key
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state_root // val
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}
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};
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}
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ircd::string_view
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ircd::m::dbs::state_root(const mutable_buffer &out,
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const event &event)
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{
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return state_root(out, at<"room_id"_>(event), at<"event_id"_>(event), at<"depth"_>(event));
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}
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ircd::string_view
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ircd::m::dbs::state_root(const mutable_buffer &out,
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const id::event &event_id)
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{
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static constexpr auto idx
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{
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json::indexof<event, "room_id"_>()
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};
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auto &column
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{
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event_column.at(idx)
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};
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id::room::buf room_id;
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column(event_id, [&room_id](const string_view &val)
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{
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room_id = val;
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});
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return state_root(out, room_id, event_id);
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}
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ircd::string_view
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ircd::m::dbs::state_root(const mutable_buffer &out,
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const id::room &room_id,
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const id::event &event_id)
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{
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static constexpr auto idx
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{
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json::indexof<event, "depth"_>()
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};
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auto &column
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{
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event_column.at(idx)
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};
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uint64_t depth;
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column(event_id, [&](const string_view &binary)
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{
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assert(size(binary) == sizeof(depth));
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depth = byte_view<uint64_t>(binary);
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});
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return state_root(out, room_id, event_id, depth);
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}
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ircd::string_view
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ircd::m::dbs::state_root(const mutable_buffer &out,
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const id::room &room_id,
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const id::event &event_id,
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const uint64_t &depth)
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{
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char keybuf[768]; const auto key
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{
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room_events_key(keybuf, room_id, depth, event_id)
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};
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string_view ret;
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room_events(key, [&out, &ret](const string_view &val)
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{
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ret = { data(out), copy(out, val) };
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});
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return ret;
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}
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bool
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ircd::m::dbs::exists(const event::id &event_id)
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{
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static constexpr auto idx
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{
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json::indexof<event, "event_id"_>()
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};
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auto &column
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{
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event_column.at(idx)
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};
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return has(column, event_id);
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}
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//
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// Database descriptors
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//
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/// State nodes are pieces of the m::state:: b-tree. The key is the hash
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/// of the value, which serves as the ID of the node when referenced in
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/// the tree. see: m/state.h for details.
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///
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const ircd::database::descriptor
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ircd::m::dbs::desc::events__state_node
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{
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// name
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"_state_node",
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// explanation
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R"(### developer note:
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)",
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// typing (key, value)
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{
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typeid(ircd::string_view), typeid(ircd::string_view)
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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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{},
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};
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/// Prefix transform for the events__room_events. The prefix here is a room_id
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/// and the suffix is the depth+event_id concatenation.
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/// for efficient sequences
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///
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/// TODO: This needs The Grammar
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///
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const ircd::db::prefix_transform
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ircd::m::dbs::desc::events__room_events__pfx
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{
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"_room_events",
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[](const string_view &key)
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{
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return key.find(":::") != key.npos;
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},
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[](const string_view &key)
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{
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return rsplit(key, ":::").first;
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}
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};
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/// Comparator for the events__room_events. The goal here is to sort the
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/// events within a room by their depth from highest to lowest, so the
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/// highest depth is hit first when a room is sought from this column.
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///
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/// TODO: This needs The Grammar
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///
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const ircd::db::comparator
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ircd::m::dbs::desc::events__room_events__cmp
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{
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"_room_events",
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// less
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[](const string_view &a, const string_view &b)
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{
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static const auto &pt
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{
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events__room_events__pfx
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};
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// Extract the prefix from the keys
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const string_view pre[2]
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{
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pt.get(a),
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pt.get(b),
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};
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if(pre[0] != pre[1])
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return pre[0] < pre[1];
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// After the prefix is the depth + event_id
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const string_view post[2]
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{
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a.substr(size(pre[0])),
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b.substr(size(pre[1])),
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};
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if(empty(post[0]))
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return true;
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if(empty(post[1]))
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return false;
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// Now want just the depth...
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const string_view depths[2]
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{
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between(post[0], ":::", "$"),
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between(post[1], ":::", "$"),
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};
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// ...as machine words
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const int64_t depth[2]
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{
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lex_cast<int64_t>(depths[0]),
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lex_cast<int64_t>(depths[1]),
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};
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// Highest to lowest sort so highest is first
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return depth[1] < depth[0];
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},
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// equal
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[](const string_view &a, const string_view &b)
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{
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return a == b;
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}
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};
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//TODO: optimize
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//TODO: Needs The Gramslam
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ircd::string_view
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ircd::m::dbs::room_events_key(const mutable_buffer &out,
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const id::room &room_id,
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const uint64_t &depth)
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{
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size_t len{0};
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len = strlcpy(out, room_id);
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len = strlcat(out, ":::");
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len = strlcat(out, lex_cast(depth));
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return { data(out), len };
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}
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//TODO: optimize
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//TODO: Needs The Gramslam
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ircd::string_view
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ircd::m::dbs::room_events_key(const mutable_buffer &out,
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const id::room &room_id,
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const uint64_t &depth,
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const id::event &event_id)
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{
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size_t len{0};
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len = strlcpy(out, room_id);
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len = strlcat(out, ":::");
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len = strlcat(out, lex_cast(depth));
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len = strlcat(out, event_id);
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return { data(out), len };
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}
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std::tuple<uint64_t, ircd::string_view>
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ircd::m::dbs::room_events_key(const string_view &amalgam)
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{
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const auto depth
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{
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between(amalgam, ":::", "$")
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};
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return
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{
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lex_cast<uint64_t>(depth),
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string_view{end(depth), end(amalgam)}
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};
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}
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/// This column stores events in sequence in a room. Consider the following:
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///
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/// [room_id | depth + event_id => state_root]
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///
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/// The key is composed from three parts:
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///
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/// - `room_id` is the official prefix, bounding the sequence. That means we
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/// make a blind query with just a room_id and get to the beginning of the
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/// sequence, then iterate until we stop before the next room_id (upper bound).
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///
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/// - `depth` is the ordering. Within the sequence, all elements are ordered by
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/// depth from HIGHEST TO LOWEST. The sequence will start at the highest depth.
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///
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/// - `event_id` is the key suffix. This column serves to sequence all events
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/// within a room ordered by depth. There may be duplicate room_id|depth
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/// prefixing but the event_id suffix gives the key total uniqueness.
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///
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/// The value is then used to store the node ID of the state tree root at this
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/// event. Nodes of the state tree are stored in the state_node column. From
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/// that root node the state of the room at the time of this event_id can be
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/// queried.
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///
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/// There is one caveat here: we can't directly take a room_id and an event_id
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/// and make a trivial query to find the state root, since the depth number
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/// gets in the way. Rather than creating yet another column without the depth,
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/// for the time being, we pay the cost of an extra query to events_depth and
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/// find that missing piece to make the exact query with all three key parts.
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///
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const ircd::database::descriptor
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ircd::m::dbs::desc::events__room_events
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{
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// name
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"_room_events",
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// explanation
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R"(### developer note:
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key is "!room_id$event_id"
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the prefix transform is in effect. this column indexes events by
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room_id offering an iterable bound of the index prefixed by room_id
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)",
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// typing (key, value)
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{
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typeid(ircd::string_view), typeid(ircd::string_view)
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},
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// options
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{},
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// comparator
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events__room_events__cmp,
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// prefix transform
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events__room_events__pfx,
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};
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//
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// Direct column descriptors
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//
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const ircd::database::descriptor
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ircd::m::dbs::desc::events_event_id
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{
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// name
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"event_id",
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// explanation
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R"(### protocol note:
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10.1
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The id of event.
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10.4
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MUST NOT exceed 255 bytes.
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### developer note:
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key is event_id. This is redundant data but we have to have it for now.
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)",
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// typing (key, value)
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{
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typeid(ircd::string_view), typeid(ircd::string_view)
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}
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};
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const ircd::database::descriptor
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ircd::m::dbs::desc::events_type
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{
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// name
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"type",
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// explanation
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R"(### protocol note:
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10.1
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The type of event. This SHOULD be namespaced similar to Java package naming conventions
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e.g. 'com.example.subdomain.event.type'.
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10.4
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MUST NOT exceed 255 bytes.
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### developer note:
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key is event_id
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)",
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// typing (key, value)
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{
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typeid(ircd::string_view), typeid(ircd::string_view)
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}
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};
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const ircd::database::descriptor
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ircd::m::dbs::desc::events_content
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{
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// name
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"content",
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// explanation
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R"(### protocol note:
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10.1
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The fields in this object will vary depending on the type of event. When interacting
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with the REST API, this is the HTTP body.
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### developer note:
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Since events must not exceed 65 KB the maximum size for the content is the remaining
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space after all the other fields for the event are rendered.
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key is event_id
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)",
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// typing (key, value)
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{
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typeid(ircd::string_view), typeid(ircd::string_view)
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}
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};
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const ircd::database::descriptor
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ircd::m::dbs::desc::events_redacts
|
|
{
|
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// name
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"redacts",
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|
|
// explanation
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R"(### protocol note:
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### developer note:
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key is event_id
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value is targeted event_id
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)",
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|
|
// typing (key, value)
|
|
{
|
|
typeid(ircd::string_view), typeid(ircd::string_view)
|
|
}
|
|
};
|
|
|
|
const ircd::database::descriptor
|
|
ircd::m::dbs::desc::events_room_id
|
|
{
|
|
// name
|
|
"room_id",
|
|
|
|
// explanation
|
|
R"(### protocol note:
|
|
|
|
10.2 (apropos room events)
|
|
Required. The ID of the room associated with this event.
|
|
|
|
10.4
|
|
MUST NOT exceed 255 bytes.
|
|
|
|
### developer note:
|
|
key is event_id
|
|
)",
|
|
|
|
// typing (key, value)
|
|
{
|
|
typeid(ircd::string_view), typeid(ircd::string_view)
|
|
}
|
|
};
|
|
|
|
const ircd::database::descriptor
|
|
ircd::m::dbs::desc::events_sender
|
|
{
|
|
// name
|
|
"sender",
|
|
|
|
// explanation
|
|
R"(### protocol note:
|
|
|
|
10.2 (apropos room events)
|
|
Required. Contains the fully-qualified ID of the user who sent this event.
|
|
|
|
10.4
|
|
MUST NOT exceed 255 bytes.
|
|
|
|
### developer note:
|
|
key is event_id
|
|
)",
|
|
|
|
// typing (key, value)
|
|
{
|
|
typeid(ircd::string_view), typeid(ircd::string_view)
|
|
}
|
|
};
|
|
|
|
const ircd::database::descriptor
|
|
ircd::m::dbs::desc::events_state_key
|
|
{
|
|
// name
|
|
"state_key",
|
|
|
|
// explanation
|
|
R"(### protocol note:
|
|
|
|
10.3 (apropos room state events)
|
|
A unique key which defines the overwriting semantics for this piece of room state.
|
|
This value is often a zero-length string. The presence of this key makes this event a
|
|
State Event. The key MUST NOT start with '_'.
|
|
|
|
10.4
|
|
MUST NOT exceed 255 bytes.
|
|
|
|
### developer note:
|
|
key is event_id
|
|
)",
|
|
|
|
// typing (key, value)
|
|
{
|
|
typeid(ircd::string_view), typeid(ircd::string_view)
|
|
}
|
|
};
|
|
|
|
const ircd::database::descriptor
|
|
ircd::m::dbs::desc::events_origin
|
|
{
|
|
// name
|
|
"origin",
|
|
|
|
// explanation
|
|
R"(### protocol note:
|
|
|
|
FEDERATION 4.1
|
|
DNS name of homeserver that created this PDU
|
|
|
|
### developer note:
|
|
key is event_id
|
|
)",
|
|
|
|
// typing (key, value)
|
|
{
|
|
typeid(ircd::string_view), typeid(ircd::string_view)
|
|
}
|
|
};
|
|
|
|
const ircd::database::descriptor
|
|
ircd::m::dbs::desc::events_origin_server_ts
|
|
{
|
|
// name
|
|
"origin_server_ts",
|
|
|
|
// explanation
|
|
R"(### protocol note:
|
|
|
|
FEDERATION 4.1
|
|
Timestamp in milliseconds on origin homeserver when this PDU was created.
|
|
|
|
### developer note:
|
|
key is event_id
|
|
value is a machine integer (binary)
|
|
|
|
TODO: consider unsigned rather than time_t because of millisecond precision
|
|
|
|
)",
|
|
|
|
// typing (key, value)
|
|
{
|
|
typeid(ircd::string_view), typeid(time_t)
|
|
}
|
|
};
|
|
|
|
const ircd::database::descriptor
|
|
ircd::m::dbs::desc::events_signatures
|
|
{
|
|
// name
|
|
"signatures",
|
|
|
|
// explanation
|
|
R"(### protocol note:
|
|
|
|
### developer note:
|
|
key is event_id
|
|
|
|
)",
|
|
|
|
// typing (key, value)
|
|
{
|
|
typeid(ircd::string_view), typeid(ircd::string_view)
|
|
}
|
|
};
|
|
|
|
const ircd::database::descriptor
|
|
ircd::m::dbs::desc::events_auth_events
|
|
{
|
|
// name
|
|
"auth_events",
|
|
|
|
// explanation
|
|
R"(### protocol note:
|
|
|
|
### developer note:
|
|
key is event_id.
|
|
)",
|
|
|
|
// typing (key, value)
|
|
{
|
|
typeid(ircd::string_view), typeid(ircd::string_view)
|
|
}
|
|
};
|
|
|
|
const ircd::database::descriptor
|
|
ircd::m::dbs::desc::events_depth
|
|
{
|
|
// name
|
|
"depth",
|
|
|
|
// explanation
|
|
R"(### protocol note:
|
|
|
|
### developer note:
|
|
key is event_id value is long integer
|
|
)",
|
|
|
|
// typing (key, value)
|
|
{
|
|
typeid(ircd::string_view), typeid(int64_t)
|
|
}
|
|
};
|
|
|
|
const ircd::database::descriptor
|
|
ircd::m::dbs::desc::events_hashes
|
|
{
|
|
// name
|
|
"hashes",
|
|
|
|
// explanation
|
|
R"(### protocol note:
|
|
|
|
### developer note:
|
|
key is event_id.
|
|
)",
|
|
|
|
// typing (key, value)
|
|
{
|
|
typeid(ircd::string_view), typeid(ircd::string_view)
|
|
}
|
|
};
|
|
|
|
const ircd::database::descriptor
|
|
ircd::m::dbs::desc::events_membership
|
|
{
|
|
// name
|
|
"membership",
|
|
|
|
// explanation
|
|
R"(### protocol note:
|
|
|
|
### developer note:
|
|
key is event_id.
|
|
)",
|
|
|
|
// typing (key, value)
|
|
{
|
|
typeid(ircd::string_view), typeid(ircd::string_view)
|
|
}
|
|
};
|
|
|
|
const ircd::database::descriptor
|
|
ircd::m::dbs::desc::events_prev_events
|
|
{
|
|
// name
|
|
"prev_events",
|
|
|
|
// explanation
|
|
R"(### protocol note:
|
|
|
|
### developer note:
|
|
key is event_id.
|
|
)",
|
|
|
|
// typing (key, value)
|
|
{
|
|
typeid(ircd::string_view), typeid(ircd::string_view)
|
|
}
|
|
};
|
|
|
|
const ircd::database::descriptor
|
|
ircd::m::dbs::desc::events_prev_state
|
|
{
|
|
// name
|
|
"prev_state",
|
|
|
|
// explanation
|
|
R"(### protocol note:
|
|
|
|
### developer note:
|
|
key is event_id.
|
|
)",
|
|
|
|
// typing (key, value)
|
|
{
|
|
typeid(ircd::string_view), typeid(ircd::string_view)
|
|
}
|
|
};
|
|
|
|
/*
|
|
const ircd::database::descriptor
|
|
event_id_in_sender
|
|
{
|
|
// name
|
|
"event_id in sender",
|
|
|
|
// explanation
|
|
R"(### developer note:
|
|
|
|
key is "@sender$event_id"
|
|
the prefix transform is in effect. this column indexes events by
|
|
sender offering an iterable bound of the index prefixed by sender
|
|
|
|
)",
|
|
|
|
// typing (key, value)
|
|
{
|
|
typeid(ircd::string_view), typeid(ircd::string_view)
|
|
},
|
|
|
|
// options
|
|
{},
|
|
|
|
// comparator
|
|
{},
|
|
|
|
// prefix transform
|
|
event_id_in,
|
|
};
|
|
|
|
/// prefix transform for origin in
|
|
///
|
|
/// This transform expects a concatenation ending with an origin which means
|
|
/// the prefix can be the same for multiple origins; therefor we can find
|
|
/// or iterate "origin in X" where X is some repeated prefix
|
|
///
|
|
/// TODO: strings will have character conflicts. must address
|
|
const ircd::db::prefix_transform
|
|
origin_in
|
|
{
|
|
"origin in",
|
|
[](const ircd::string_view &key)
|
|
{
|
|
return has(key, ":::");
|
|
//return key.find(':') != key.npos;
|
|
},
|
|
[](const ircd::string_view &key)
|
|
{
|
|
return split(key, ":::").first;
|
|
//return rsplit(key, ':').first;
|
|
}
|
|
};
|
|
|
|
const ircd::database::descriptor
|
|
origin_in_room_id
|
|
{
|
|
// name
|
|
"origin in room_id",
|
|
|
|
// explanation
|
|
R"(### developer note:
|
|
|
|
key is "!room_id:origin"
|
|
the prefix transform is in effect. this column indexes origins in a
|
|
room_id offering an iterable bound of the index prefixed by room_id
|
|
|
|
)",
|
|
|
|
// typing (key, value)
|
|
{
|
|
typeid(ircd::string_view), typeid(ircd::string_view)
|
|
},
|
|
|
|
// options
|
|
{},
|
|
|
|
// comparator - sorts from highest to lowest
|
|
{}, //ircd::db::reverse_cmp_string_view{},
|
|
|
|
// prefix transform
|
|
origin_in,
|
|
};
|
|
|
|
const ircd::database::descriptor
|
|
origin_joined_in_room_id
|
|
{
|
|
// name
|
|
"origin_joined in room_id",
|
|
|
|
// explanation
|
|
R"(### developer note:
|
|
|
|
key is "!room_id:origin"
|
|
the prefix transform is in effect. this column indexes origins in a
|
|
room_id offering an iterable bound of the index prefixed by room_id
|
|
|
|
)",
|
|
|
|
// typing (key, value)
|
|
{
|
|
typeid(ircd::string_view), typeid(ircd::string_view)
|
|
},
|
|
|
|
// options
|
|
{},
|
|
|
|
// comparator - sorts from highest to lowest
|
|
{}, //ircd::db::reverse_cmp_string_view{},
|
|
|
|
// prefix transform
|
|
origin_in,
|
|
};
|
|
|
|
/// prefix transform for room_id
|
|
///
|
|
/// This transform expects a concatenation ending with a room_id which means
|
|
/// the prefix can be the same for multiple room_id's; therefor we can find
|
|
/// or iterate "room_id in X" where X is some repeated prefix
|
|
///
|
|
const ircd::db::prefix_transform room_id_in
|
|
{
|
|
"room_id in",
|
|
[](const ircd::string_view &key)
|
|
{
|
|
return key.find('!') != key.npos;
|
|
},
|
|
[](const ircd::string_view &key)
|
|
{
|
|
return rsplit(key, '!').first;
|
|
}
|
|
};
|
|
|
|
/// 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
|
|
///
|
|
/// TODO: arbitrary type strings will have character conflicts. must address
|
|
/// TODO: with grammars.
|
|
const ircd::db::prefix_transform type_state_key_in_room_id
|
|
{
|
|
"type,state_key in room_id",
|
|
[](const ircd::string_view &key)
|
|
{
|
|
return key.find("..") != key.npos;
|
|
},
|
|
[](const ircd::string_view &key)
|
|
{
|
|
return split(key, "..").first;
|
|
}
|
|
};
|
|
|
|
const ircd::database::descriptor
|
|
event_id_for_type_state_key_in_room_id
|
|
{
|
|
// name
|
|
"event_id for type,state_key in room_id",
|
|
|
|
// explanation
|
|
R"(### developer note:
|
|
|
|
)",
|
|
|
|
// typing (key, value)
|
|
{
|
|
typeid(ircd::string_view), typeid(ircd::string_view)
|
|
},
|
|
|
|
// options
|
|
{},
|
|
|
|
// comparator
|
|
{},
|
|
|
|
// prefix transform
|
|
type_state_key_in_room_id
|
|
};
|
|
|
|
const ircd::database::descriptor
|
|
prev_event_id_for_event_id_in_room_id
|
|
{
|
|
// name
|
|
"prev_event_id for event_id in room_id",
|
|
|
|
// explanation
|
|
R"(### developer note:
|
|
|
|
)",
|
|
|
|
// typing (key, value)
|
|
{
|
|
typeid(ircd::string_view), typeid(ircd::string_view)
|
|
},
|
|
|
|
// options
|
|
{},
|
|
|
|
// comparator
|
|
{},
|
|
|
|
// prefix transform
|
|
event_id_in
|
|
};
|
|
|
|
/// prefix transform for event_id in room_id,type,state_key
|
|
///
|
|
/// This transform is special for concatenating room_id with type and state_key
|
|
/// and event_id in that order with prefix being the room_id,type,state_key. This
|
|
/// will index multiple event_ids with the same type,state_key in a room which
|
|
/// allows for a temporal depth to the database; event_id for type,state_key only
|
|
/// resolves to a single latest event and overwrites itself as per the room state
|
|
/// algorithm whereas this can map all of them and then allows for tracing.
|
|
///
|
|
/// TODO: arbitrary type strings will have character conflicts. must address
|
|
/// TODO: with grammars.
|
|
const ircd::db::prefix_transform
|
|
event_id_in_room_id_type_state_key
|
|
{
|
|
"event_id in room_id,type_state_key",
|
|
[](const ircd::string_view &key)
|
|
{
|
|
return has(key, '$');
|
|
},
|
|
[](const ircd::string_view &key)
|
|
{
|
|
return split(key, '$').first;
|
|
}
|
|
};
|
|
|
|
const ircd::database::descriptor
|
|
prev_event_id_for_type_state_key_event_id_in_room_id
|
|
{
|
|
// name
|
|
"prev_event_id for type,state_key,event_id in room_id",
|
|
|
|
// explanation
|
|
R"(### developer note:
|
|
|
|
)",
|
|
|
|
// typing (key, value)
|
|
{
|
|
typeid(ircd::string_view), typeid(ircd::string_view)
|
|
},
|
|
|
|
// options
|
|
{},
|
|
|
|
// comparator
|
|
{},
|
|
|
|
// prefix transform
|
|
event_id_in_room_id_type_state_key
|
|
};
|
|
*/
|
|
|
|
const ircd::database::description
|
|
ircd::m::dbs::desc::events
|
|
{
|
|
// Requirement of RocksDB/LevelDB
|
|
{ "default" },
|
|
|
|
////////
|
|
//
|
|
// These columns directly represent event fields indexed by event_id and
|
|
// the value is the actual event values. Some values may be JSON, like
|
|
// content.
|
|
//
|
|
events_auth_events,
|
|
events_content,
|
|
events_depth,
|
|
events_event_id,
|
|
events_hashes,
|
|
events_membership,
|
|
events_origin,
|
|
events_origin_server_ts,
|
|
events_prev_events,
|
|
events_prev_state,
|
|
events_redacts,
|
|
events_room_id,
|
|
events_sender,
|
|
events_signatures,
|
|
events_state_key,
|
|
events_type,
|
|
|
|
////////
|
|
//
|
|
// These columns are metadata composed from the event data. Specifically,
|
|
// they are designed for fast sequential iterations.
|
|
//
|
|
|
|
// (state tree node id) => (state tree node)
|
|
events__state_node,
|
|
|
|
// (room_id, event_id) => (state_root)
|
|
// Sequence of all events for a room, ever.
|
|
events__room_events,
|
|
};
|