mirror of
https://github.com/matrix-construct/construct
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987 lines
23 KiB
C++
987 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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/// Convenience to make a key and then get a value
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void
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ircd::m::state::get(const string_view &root,
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const string_view &type,
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const string_view &state_key,
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const val_closure &closure)
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{
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if(!get(std::nothrow, root, type, state_key, closure))
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throw m::NOT_FOUND
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{
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"type='%s' state_key='%s' not found in tree %s",
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type,
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state_key,
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root
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};
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}
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/// Convenience to make a key and then get a value (doesn't throw NOT_FOUND)
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bool
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ircd::m::state::get(std::nothrow_t,
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const string_view &root,
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const string_view &type,
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const string_view &state_key,
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const val_closure &closure)
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{
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char key[KEY_MAX_SZ];
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return get(std::nothrow, root, make_key(key, type, state_key), closure);
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}
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/// throws m::NOT_FOUND if the exact key and its value does not exist.
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void
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ircd::m::state::get(const string_view &root,
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const json::array &key,
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const val_closure &closure)
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{
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if(!get(std::nothrow, root, key, closure))
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throw m::NOT_FOUND
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{
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"%s not found in tree %s",
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string_view{key},
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root
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};
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}
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/// Recursive query to find the leaf value for the given key, starting from
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/// the given root node ID. Value can be viewed in the closure. Returns false
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/// if the exact key and its value does not exist in the tree; no node ID's
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/// are ever returned here.
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bool
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ircd::m::state::get(std::nothrow_t,
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const string_view &root,
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const json::array &key,
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const val_closure &closure)
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{
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bool ret{false};
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char nextbuf[ID_MAX_SZ];
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string_view nextid{root};
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while(nextid) get_node(nextid, [&](const node &node)
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{
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auto pos(node.find(key));
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if(pos < node.keys() && node.key(pos) == key)
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{
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ret = true;
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nextid = {};
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closure(node.val(pos));
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return;
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}
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const auto c(node.childs());
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if(c && pos >= c)
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pos = c - 1;
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if(node.has_child(pos))
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nextid = { nextbuf, strlcpy(nextbuf, node.child(pos)) };
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else
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nextid = {};
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});
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return ret;
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}
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size_t
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ircd::m::state::count(const string_view &root)
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{
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return count(root, []
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(const json::array &key, const string_view &val)
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{
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return true;
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});
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}
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size_t
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ircd::m::state::count(const string_view &root,
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const iter_bool_closure &closure)
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{
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size_t ret{0};
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for_each(root, [&ret, &closure]
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(const json::array &key, const string_view &val)
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{
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ret += closure(key, val);
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});
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return ret;
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}
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void
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ircd::m::state::for_each(const string_view &root,
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const iter_closure &closure)
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{
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test(root, [&closure]
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(const json::array &key, const string_view &val)
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{
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closure(key, val);
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return false;
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});
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}
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void
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ircd::m::state::for_each(const string_view &root,
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const string_view &type,
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const iter_closure &closure)
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{
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test(root, type, [&closure]
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(const json::array &key, const string_view &val)
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{
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closure(key, val);
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return false;
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});
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}
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bool
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ircd::m::state::test(const string_view &root,
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const iter_bool_closure &closure)
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{
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return dfs(root, [&closure]
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(const json::array &key, const string_view &val, const uint &, const uint &)
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{
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return closure(key, val);
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});
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}
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bool
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ircd::m::state::test(const string_view &root,
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const string_view &type,
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const iter_bool_closure &closure)
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{
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char buf[KEY_MAX_SZ];
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const json::array key
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{
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make_key(buf, type)
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};
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return dfs(root, key, [&closure]
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(const json::array &key, const string_view &val, const uint &, const uint &)
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{
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return closure(key, val);
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});
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}
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namespace ircd::m::state
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{
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bool _dfs_recurse(const search_closure &, const node &, const json::array &key, int &);
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}
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bool
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ircd::m::state::dfs(const string_view &root,
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const search_closure &closure)
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{
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return dfs(root, json::array{}, closure);
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}
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bool
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ircd::m::state::dfs(const string_view &root,
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const json::array &key,
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const search_closure &closure)
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{
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bool ret{true};
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get_node(root, [&closure, &key, &ret]
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(const auto &node)
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{
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int depth(-1);
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ret = _dfs_recurse(closure, node, key, depth);
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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::state::_dfs_recurse(const search_closure &closure,
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const node &node,
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const json::array &key,
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int &depth)
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{
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++depth;
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const unwind down{[&depth]
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{
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--depth;
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}};
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const node::rep rep{node};
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const auto kpos{rep.find(key)};
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for(uint pos(kpos); pos < rep.kn || pos < rep.cn; ++pos)
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{
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if(!empty(rep.chld[pos]))
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{
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bool ret{false};
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get_node(rep.chld[pos], [&closure, &key, &depth, &ret]
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(const auto &node)
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{
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ret = _dfs_recurse(closure, node, key, depth);
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});
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if(ret)
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return true;
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}
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if(rep.kn <= pos)
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continue;
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if(!empty(key) && !prefix_eq(key, rep.keys[pos]))
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break;
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if(closure(rep.keys[pos], rep.vals[pos], depth, pos))
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return true;
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}
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return false;
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}
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// Internal insertion operations
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namespace ircd::m::state
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{
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static mutable_buffer _getbuffer(const uint8_t &height);
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static string_view _insert_overwrite(db::txn &, const json::array &key, const string_view &val, const mutable_buffer &idbuf, node::rep &, const size_t &pos);
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static string_view _insert_leaf_nonfull(db::txn &, const json::array &key, const string_view &val, const mutable_buffer &idbuf, node::rep &, const size_t &pos);
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static json::object _insert_leaf_full(const int8_t &height, db::txn &, const json::array &key, const string_view &val, node::rep &, const size_t &pos, node::rep &push);
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static string_view _insert_branch_nonfull(db::txn &, const mutable_buffer &idbuf, node::rep &, const size_t &pos, node::rep &pushed);
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static json::object _insert_branch_full(const int8_t &height, db::txn &, node::rep &, const size_t &pos, node::rep &push, const node::rep &pushed);
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static string_view _insert(int8_t &height, db::txn &, const json::array &key, const string_view &val, const node &node, const mutable_buffer &idbuf, node::rep &push);
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static string_view _create(db::txn &, const mutable_buffer &root, const string_view &type, const string_view &state_key, const string_view &val);
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}
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/// State update from an event. Leaves the root node ID in the root buffer;
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/// returns view.
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///
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ircd::m::state::id
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ircd::m::state::insert(db::txn &txn,
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const mutable_buffer &rootout,
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const string_view &rootin,
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const event &event)
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{
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const auto &type{at<"type"_>(event)};
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const auto &state_key{at<"state_key"_>(event)};
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const auto &event_id{at<"event_id"_>(event)};
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if(type == "m.room.create")
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{
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assert(empty(rootin));
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return _create(txn, rootout, type, state_key, event_id);
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}
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assert(!empty(rootin));
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return insert(txn, rootout, rootin, type, state_key, event_id);
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}
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ircd::m::state::id
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ircd::m::state::_create(db::txn &txn,
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const mutable_buffer &root,
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const string_view &type,
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const string_view &state_key,
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const string_view &val)
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{
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assert(type == "m.room.create");
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assert(defined(state_key));
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// Because this is a new tree and nothing is read from the DB, all
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// writes here are just copies into the txn and these buffers can
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// remain off-stack.
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const critical_assertion ca;
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thread_local char key[KEY_MAX_SZ];
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thread_local char node[NODE_MAX_SZ];
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node::rep rep;
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rep.keys[0] = make_key(key, type, state_key);
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rep.kn = 1;
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rep.vals[0] = val;
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rep.vn = 1;
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rep.chld[0] = string_view{};
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rep.cn = 1;
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return set_node(txn, root, rep.write(node));
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}
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/// State update for room_id inserting (type,state_key) = event_id into the
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/// tree. Leaves the root node ID in the root buffer; returns view.
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ircd::m::state::id
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ircd::m::state::insert(db::txn &txn,
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const mutable_buffer &rootout,
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const string_view &rootin,
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const string_view &type,
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const string_view &state_key,
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const m::id::event &event_id)
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{
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// The insertion process reads from the DB and will yield this ircd::ctx
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// so the key buffer must stay on this stack.
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char key[KEY_MAX_SZ];
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return insert(txn, rootout, rootin, make_key(key, type, state_key), event_id);
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}
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ircd::m::state::id
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ircd::m::state::insert(db::txn &txn,
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const mutable_buffer &rootout,
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const string_view &rootin,
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const json::array &key,
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const m::id::event &event_id)
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{
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node::rep push;
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int8_t height{0};
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string_view root{rootin};
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get_node(root, [&](const node &node)
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{
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root = _insert(height, txn, key, event_id, node, rootout, push);
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});
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if(push.kn)
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root = push.write(txn, rootout);
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return root;
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}
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ircd::m::state::id
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ircd::m::state::_insert(int8_t &height,
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db::txn &txn,
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const json::array &key,
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const string_view &val,
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const node &node,
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const mutable_buffer &idbuf,
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node::rep &push)
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{
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// Recursion metrics
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const unwind down{[&height]{ --height; }};
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if(unlikely(++height >= MAX_HEIGHT))
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throw assertive{"recursion limit exceeded"};
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// This function assumes that any node argument is a previously "existing"
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// node which means it contains at least one key/value.
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assert(node.keys() > 0);
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assert(node.keys() == node.vals());
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node::rep rep{node};
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const auto pos{node.find(key)};
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if(keycmp(node.key(pos), key) == 0)
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return _insert_overwrite(txn, key, val, idbuf, rep, pos);
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if(node.childs() == 0 && rep.full())
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return _insert_leaf_full(height, txn, key, val, rep, pos, push);
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if(node.childs() == 0 && !rep.full())
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return _insert_leaf_nonfull(txn, key, val, idbuf, rep, pos);
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if(empty(node.child(pos)))
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return _insert_leaf_nonfull(txn, key, val, idbuf, rep, pos);
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// These collect data from the next level.
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node::rep pushed;
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string_view child;
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// Recurse
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get_node(node.child(pos), [&](const auto &node)
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{
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child = _insert(height, txn, key, val, node, idbuf, pushed);
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});
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// Child was pushed but that will stop here.
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if(pushed.kn && !rep.full())
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return _insert_branch_nonfull(txn, idbuf, rep, pos, pushed);
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// Most complex branch
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if(pushed.kn && rep.full())
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return _insert_branch_full(height, txn, rep, pos, push, pushed);
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// Indicates no push, and the child value is just an ID of a node.
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rep.chld[pos] = child;
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return rep.write(txn, idbuf);
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}
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ircd::json::object
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ircd::m::state::_insert_branch_full(const int8_t &height,
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db::txn &txn,
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node::rep &rep,
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const size_t &pos,
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node::rep &push,
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const node::rep &pushed)
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{
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rep.shr(pos);
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rep.keys[pos] = pushed.keys[0];
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++rep.kn;
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rep.vals[pos] = pushed.vals[0];
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++rep.vn;
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rep.chld[pos] = pushed.chld[0];
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rep.chld[pos + 1] = pushed.chld[1];
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++rep.cn;
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size_t i(0);
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node::rep left;
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for(; i < rep.kn / 2; ++i)
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{
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left.keys[left.kn++] = rep.keys[i];
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left.vals[left.vn++] = rep.vals[i];
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left.chld[left.cn++] = rep.chld[i];
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}
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left.chld[left.cn++] = rep.chld[i];
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push.keys[push.kn++] = rep.keys[i];
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push.vals[push.vn++] = rep.vals[i];
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node::rep right;
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for(++i; i < rep.kn; ++i)
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{
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right.keys[right.kn++] = rep.keys[i];
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right.vals[right.vn++] = rep.vals[i];
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right.chld[right.cn++] = rep.chld[i];
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}
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right.chld[right.cn++] = rep.chld[i];
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thread_local char lc[ID_MAX_SZ], rc[ID_MAX_SZ];
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push.chld[push.cn++] = left.write(txn, lc);
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push.chld[push.cn++] = right.write(txn, rc);
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const auto ret
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{
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push.write(_getbuffer(height))
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};
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// Courtesy reassignment of all the references in `push` after rewrite.
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push = state::node{ret};
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return ret;
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}
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ircd::json::object
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ircd::m::state::_insert_leaf_full(const int8_t &height,
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db::txn &txn,
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const json::array &key,
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const string_view &val,
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node::rep &rep,
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const size_t &pos,
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node::rep &push)
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{
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rep.shr(pos);
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rep.keys[pos] = key;
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++rep.kn;
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rep.vals[pos] = val;
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++rep.vn;
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size_t i(0);
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node::rep left;
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for(; i < rep.kn / 2; ++i)
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{
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left.keys[left.kn++] = rep.keys[i];
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left.vals[left.vn++] = rep.vals[i];
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left.chld[left.cn++] = string_view{};
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}
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push.keys[push.kn++] = rep.keys[i];
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push.vals[push.vn++] = rep.vals[i];
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node::rep right;
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for(++i; i < rep.kn; ++i)
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{
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right.keys[right.kn++] = rep.keys[i];
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right.vals[right.vn++] = rep.vals[i];
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right.chld[right.cn++] = string_view{};
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}
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thread_local char lc[ID_MAX_SZ], rc[ID_MAX_SZ];
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push.chld[push.cn++] = left.write(txn, lc);
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push.chld[push.cn++] = right.write(txn, rc);
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const auto ret
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{
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push.write(_getbuffer(height))
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};
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// Courtesy reassignment of all the references in `push` after rewrite.
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push = state::node{ret};
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return ret;
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}
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ircd::m::state::id
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ircd::m::state::_insert_branch_nonfull(db::txn &txn,
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const mutable_buffer &idbuf,
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node::rep &rep,
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const size_t &pos,
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node::rep &pushed)
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{
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rep.shr(pos);
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rep.keys[pos] = pushed.keys[0];
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++rep.kn;
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rep.vals[pos] = pushed.vals[0];
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++rep.vn;
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rep.chld[pos] = pushed.chld[0];
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rep.chld[pos + 1] = pushed.chld[1];
|
|
++rep.cn;
|
|
|
|
return rep.write(txn, idbuf);
|
|
}
|
|
|
|
ircd::m::state::id
|
|
ircd::m::state::_insert_leaf_nonfull(db::txn &txn,
|
|
const json::array &key,
|
|
const string_view &val,
|
|
const mutable_buffer &idbuf,
|
|
node::rep &rep,
|
|
const size_t &pos)
|
|
{
|
|
rep.shr(pos);
|
|
|
|
rep.keys[pos] = key;
|
|
++rep.kn;
|
|
|
|
rep.vals[pos] = val;
|
|
++rep.vn;
|
|
|
|
rep.chld[pos] = string_view{};
|
|
++rep.cn;
|
|
|
|
return rep.write(txn, idbuf);
|
|
}
|
|
|
|
ircd::m::state::id
|
|
ircd::m::state::_insert_overwrite(db::txn &txn,
|
|
const json::array &key,
|
|
const string_view &val,
|
|
const mutable_buffer &idbuf,
|
|
node::rep &rep,
|
|
const size_t &pos)
|
|
{
|
|
rep.keys[pos] = key;
|
|
rep.vals[pos] = val;
|
|
|
|
return rep.write(txn, idbuf);
|
|
}
|
|
|
|
/// This function returns a thread_local buffer intended for writing temporary
|
|
/// nodes which may be "pushed" down the tree during the btree insertion
|
|
/// process. This is an alternative to allocating such space in each stack
|
|
/// frame when only one or two are ever used at a time -- but because more than
|
|
/// one may be used at a time during complex rebalances we have the user pass
|
|
/// their current recursion depth which is used to partition the buffer so they
|
|
/// don't overwrite their own data.
|
|
ircd::mutable_buffer
|
|
ircd::m::state::_getbuffer(const uint8_t &height)
|
|
{
|
|
static const size_t buffers{2};
|
|
using buffer_type = std::array<char, NODE_MAX_SZ>;
|
|
thread_local std::array<buffer_type, buffers> buffer;
|
|
return buffer.at(height % buffer.size());
|
|
}
|
|
|
|
/// View a node by ID. This makes a DB query and may yield ircd::ctx.
|
|
void
|
|
ircd::m::state::get_node(const string_view &node_id,
|
|
const node_closure &closure)
|
|
{
|
|
assert(bool(dbs::state_node));
|
|
auto &column{dbs::state_node};
|
|
column(node_id, closure);
|
|
}
|
|
|
|
/// Writes a node to the db::txn and returns the id of this node (a hash) into
|
|
/// the buffer.
|
|
ircd::m::state::id
|
|
ircd::m::state::set_node(db::txn &iov,
|
|
const mutable_buffer &hashbuf,
|
|
const json::object &node)
|
|
{
|
|
const sha256::buf hash
|
|
{
|
|
sha256{node}
|
|
};
|
|
|
|
const auto hashb64
|
|
{
|
|
b64encode_unpadded(hashbuf, hash)
|
|
};
|
|
|
|
db::txn::append
|
|
{
|
|
iov, dbs::state_node,
|
|
{
|
|
db::op::SET,
|
|
hashb64, // key
|
|
node, // val
|
|
}
|
|
};
|
|
|
|
return hashb64;
|
|
}
|
|
|
|
/// Creates a key array from the most common key pattern of a matrix
|
|
/// room (type,state_key).
|
|
ircd::json::array
|
|
ircd::m::state::make_key(const mutable_buffer &out,
|
|
const string_view &type,
|
|
const string_view &state_key)
|
|
{
|
|
const json::value key_parts[]
|
|
{
|
|
type, state_key
|
|
};
|
|
|
|
const json::value key
|
|
{
|
|
key_parts, 2
|
|
};
|
|
|
|
return { data(out), json::print(out, key) };
|
|
}
|
|
|
|
ircd::json::array
|
|
ircd::m::state::make_key(const mutable_buffer &out,
|
|
const string_view &type)
|
|
{
|
|
const json::value key_parts[]
|
|
{
|
|
type
|
|
};
|
|
|
|
const json::value key
|
|
{
|
|
key_parts, 1
|
|
};
|
|
|
|
return { data(out), json::print(out, key) };
|
|
}
|
|
|
|
bool
|
|
ircd::m::state::prefix_eq(const json::array &a,
|
|
const json::array &b)
|
|
{
|
|
ushort i(0);
|
|
auto ait(begin(a));
|
|
auto bit(begin(b));
|
|
for(; ait != end(a) && bit != end(b) && i < 2; ++ait, ++bit)
|
|
{
|
|
assert(surrounds(*ait, '"'));
|
|
assert(surrounds(*bit, '"'));
|
|
|
|
if(*ait == *bit)
|
|
{
|
|
if(i)
|
|
return false;
|
|
}
|
|
else ++i;
|
|
}
|
|
|
|
return ait != end(a) || bit != end(b)? i == 0 : i < 2;
|
|
}
|
|
|
|
/// Compares two keys. Keys are arrays of strings which become safely
|
|
/// concatenated for a linear lexical comparison. Returns -1 if a less
|
|
/// than b; 0 if equal; 1 if a greater than b.
|
|
int
|
|
ircd::m::state::keycmp(const json::array &a,
|
|
const json::array &b)
|
|
{
|
|
auto ait(begin(a));
|
|
auto bit(begin(b));
|
|
for(; ait != end(a) && bit != end(b); ++ait, ++bit)
|
|
{
|
|
assert(surrounds(*ait, '"'));
|
|
assert(surrounds(*bit, '"'));
|
|
|
|
if(*ait < *bit)
|
|
return -1;
|
|
|
|
if(*bit < *ait)
|
|
return 1;
|
|
}
|
|
|
|
assert(ait == end(a) || bit == end(b));
|
|
return ait == end(a) && bit != end(b)? -1:
|
|
ait == end(a) && bit == end(b)? 0:
|
|
1;
|
|
}
|
|
|
|
//
|
|
// rep
|
|
//
|
|
|
|
ircd::m::state::node::rep::rep(const node &node)
|
|
:kn{node.keys(keys.data(), keys.size())}
|
|
,vn{node.vals(vals.data(), vals.size())}
|
|
,cn{node.childs(chld.data(), chld.size())}
|
|
{
|
|
}
|
|
|
|
ircd::m::state::id
|
|
ircd::m::state::node::rep::write(db::txn &txn,
|
|
const mutable_buffer &idbuf)
|
|
{
|
|
thread_local char buf[NODE_MAX_SZ];
|
|
return set_node(txn, idbuf, write(buf));
|
|
}
|
|
|
|
ircd::json::object
|
|
ircd::m::state::node::rep::write(const mutable_buffer &out)
|
|
{
|
|
assert(kn == vn);
|
|
assert(cn <= kn + 1);
|
|
assert(!childs() || childs() > kn);
|
|
assert(!duplicates());
|
|
|
|
assert(kn > 0 && vn > 0);
|
|
assert(kn <= NODE_MAX_KEY);
|
|
assert(vn <= NODE_MAX_VAL);
|
|
assert(cn <= NODE_MAX_DEG);
|
|
|
|
json::value keys[kn];
|
|
{
|
|
for(size_t i(0); i < kn; ++i)
|
|
keys[i] = this->keys[i];
|
|
}
|
|
|
|
json::value vals[vn];
|
|
{
|
|
for(size_t i(0); i < vn; ++i)
|
|
vals[i] = this->vals[i];
|
|
};
|
|
|
|
json::value chld[cn];
|
|
{
|
|
for(size_t i(0); i < cn; ++i)
|
|
chld[i] = this->chld[i];
|
|
};
|
|
|
|
json::iov iov;
|
|
const json::iov::push push[]
|
|
{
|
|
{ iov, { "k"_sv, { keys, kn } } },
|
|
{ iov, { "v"_sv, { vals, vn } } },
|
|
{ iov, { "c"_sv, { chld, cn } } },
|
|
};
|
|
|
|
return { data(out), json::print(out, iov) };
|
|
}
|
|
|
|
/// Shift right.
|
|
void
|
|
ircd::m::state::node::rep::shr(const size_t &pos)
|
|
{
|
|
std::copy_backward(begin(keys) + pos, begin(keys) + kn, begin(keys) + kn + 1);
|
|
std::copy_backward(begin(vals) + pos, begin(vals) + vn, begin(vals) + vn + 1);
|
|
std::copy_backward(begin(chld) + pos, begin(chld) + cn, begin(chld) + cn + 1);
|
|
}
|
|
|
|
size_t
|
|
ircd::m::state::node::rep::find(const json::array &parts)
|
|
const
|
|
{
|
|
size_t i{0};
|
|
for(; i < kn; ++i)
|
|
if(keycmp(parts, keys[i]) <= 0)
|
|
return i;
|
|
|
|
return i;
|
|
}
|
|
|
|
size_t
|
|
ircd::m::state::node::rep::childs()
|
|
const
|
|
{
|
|
size_t ret(0);
|
|
for(size_t i(0); i < cn; ++i)
|
|
if(!empty(unquote(chld[i])))
|
|
++ret;
|
|
|
|
return ret;
|
|
}
|
|
|
|
bool
|
|
ircd::m::state::node::rep::duplicates()
|
|
const
|
|
{
|
|
for(size_t i(0); i < kn; ++i)
|
|
for(size_t j(0); j < kn; ++j)
|
|
if(j != i && keys[i] == keys[j])
|
|
return true;
|
|
|
|
for(size_t i(0); i < cn; ++i)
|
|
if(!empty(unquote(chld[i])))
|
|
for(size_t j(0); j < cn; ++j)
|
|
if(j != i && chld[i] == chld[j])
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
bool
|
|
ircd::m::state::node::rep::overfull()
|
|
const
|
|
{
|
|
assert(kn == vn);
|
|
return kn > NODE_MAX_KEY;
|
|
}
|
|
|
|
bool
|
|
ircd::m::state::node::rep::full()
|
|
const
|
|
{
|
|
assert(kn == vn);
|
|
return kn >= NODE_MAX_KEY;
|
|
}
|
|
|
|
//
|
|
// node
|
|
//
|
|
|
|
// Count values that actually lead to other nodes
|
|
bool
|
|
ircd::m::state::node::has_child(const size_t &pos)
|
|
const
|
|
{
|
|
return !empty(child(pos));
|
|
}
|
|
|
|
// Count values that actually lead to other nodes
|
|
bool
|
|
ircd::m::state::node::has_key(const json::array &key)
|
|
const
|
|
{
|
|
const auto pos(find(key));
|
|
if(pos >= keys())
|
|
return false;
|
|
|
|
return keycmp(this->key(pos), key) == 0;
|
|
}
|
|
|
|
/// Find position for a val in node. Uses the keycmp(). If there is one
|
|
/// key in node, and the argument compares less than or equal to the key,
|
|
/// 0 is returned, otherwise 1 is returned. If there are two keys in node
|
|
/// and argument compares less than both, 0 is returned; equal to key[0],
|
|
/// 0 is returned; greater than key[0] and less than or equal to key[1],
|
|
/// 1 is returned; greater than both: 2 is returned. Note that there can
|
|
/// be one more childs() than keys() in a node (this is usually a "full
|
|
/// node") but there might not be, and the returned pos might be out of
|
|
/// range.
|
|
size_t
|
|
ircd::m::state::node::find(const json::array &parts)
|
|
const
|
|
{
|
|
size_t ret{0};
|
|
for(const json::array key : json::get<"k"_>(*this))
|
|
if(keycmp(parts, key) <= 0)
|
|
return ret;
|
|
else
|
|
++ret;
|
|
|
|
return ret;
|
|
}
|
|
|
|
size_t
|
|
ircd::m::state::node::childs(state::id *const &out,
|
|
const size_t &max)
|
|
const
|
|
{
|
|
size_t i(0);
|
|
for(const string_view &c : json::get<"c"_>(*this))
|
|
if(likely(i < max))
|
|
out[i++] = unquote(c);
|
|
|
|
return i;
|
|
}
|
|
|
|
size_t
|
|
ircd::m::state::node::vals(string_view *const &out,
|
|
const size_t &max)
|
|
const
|
|
{
|
|
size_t i(0);
|
|
for(const string_view &v : json::get<"v"_>(*this))
|
|
if(likely(i < max))
|
|
out[i++] = unquote(v);
|
|
|
|
return i;
|
|
}
|
|
|
|
size_t
|
|
ircd::m::state::node::keys(json::array *const &out,
|
|
const size_t &max)
|
|
const
|
|
{
|
|
size_t i(0);
|
|
for(const json::array &k : json::get<"k"_>(*this))
|
|
if(likely(i < max))
|
|
out[i++] = k;
|
|
|
|
return i;
|
|
}
|
|
|
|
ircd::m::state::id
|
|
ircd::m::state::node::child(const size_t &pos)
|
|
const
|
|
{
|
|
const json::array &children
|
|
{
|
|
json::get<"c"_>(*this, json::empty_array)
|
|
};
|
|
|
|
return unquote(children[pos]);
|
|
}
|
|
|
|
// Get value at position pos (throws out_of_range)
|
|
ircd::string_view
|
|
ircd::m::state::node::val(const size_t &pos)
|
|
const
|
|
{
|
|
const json::array &values
|
|
{
|
|
json::get<"v"_>(*this, json::empty_array)
|
|
};
|
|
|
|
return unquote(values[pos]);
|
|
}
|
|
|
|
// Get key at position pos (throws out_of_range)
|
|
ircd::json::array
|
|
ircd::m::state::node::key(const size_t &pos)
|
|
const
|
|
{
|
|
const json::array &keys
|
|
{
|
|
json::get<"k"_>(*this, json::empty_array)
|
|
};
|
|
|
|
return keys[pos];
|
|
}
|
|
|
|
// Count children in node
|
|
size_t
|
|
ircd::m::state::node::childs()
|
|
const
|
|
{
|
|
size_t ret(0);
|
|
for(const auto &c : json::get<"c"_>(*this))
|
|
ret += !empty(c) && c != json::empty_string;
|
|
|
|
return ret;
|
|
}
|
|
|
|
// Count values in node
|
|
size_t
|
|
ircd::m::state::node::vals()
|
|
const
|
|
{
|
|
return json::get<"v"_>(*this).count();
|
|
}
|
|
|
|
/// Count keys in node
|
|
size_t
|
|
ircd::m::state::node::keys()
|
|
const
|
|
{
|
|
return json::get<"k"_>(*this).count();
|
|
}
|