mirror of
https://github.com/savoirfairelinux/opendht.git
synced 2026-11-08 12:28:42 +00:00
117 lines
3.4 KiB
C++
117 lines
3.4 KiB
C++
/*
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* Copyright (C) 2014-2017 Savoir-faire Linux Inc.
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* Author(s) : Adrien Béraud <adrien.beraud@savoirfairelinux.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#include "node_cache.h"
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namespace dht {
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std::shared_ptr<Node>
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NodeCache::getNode(const InfoHash& id, sa_family_t family) {
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return (family == AF_INET ? cache_4 : cache_6).getNode(id);
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}
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std::shared_ptr<Node>
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NodeCache::getNode(const InfoHash& id, const SockAddr& addr, time_point now, bool confirm) {
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if (id == zeroes)
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return std::make_shared<Node>(id, addr);
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return (addr.getFamily() == AF_INET ? cache_4 : cache_6).getNode(id, addr, now, confirm);
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}
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std::vector<std::shared_ptr<Node>>
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NodeCache::getCachedNodes(const InfoHash& id, sa_family_t sa_f, size_t count) {
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const auto& c = (sa_f == AF_INET ? cache_4 : cache_6);
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auto it_p = c.lower_bound(id),
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it_n = it_p;
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std::vector<std::shared_ptr<Node>> nodes;
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nodes.reserve(std::min(c.size(), count));
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NodeMap::const_iterator it;
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if (it_p != c.begin()) /* Create 2 separate iterator if we could */
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--it_p;
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while (nodes.size() < count and (it_n != c.end() or it_p != c.end())) {
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/* If one of the iterator is at the end, then take the other one
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If they are both in middle of somewhere comapre both and take
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the closest to the id. */
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if (it_p == c.end()) it = it_n++;
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else if (it_n == c.end()) it = it_p--;
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else it = id.xorCmp(it_p->first, it_n->first) < 0 ? it_p-- : it_n++;
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if (it == c.begin())
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it_p = c.end();
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if (auto n = it->second.lock())
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if ( not n->isExpired() )
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nodes.emplace_back(std::move(n));
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}
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return nodes;
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}
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void
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NodeCache::clearBadNodes(sa_family_t family)
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{
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if (family == 0) {
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clearBadNodes(AF_INET);
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clearBadNodes(AF_INET6);
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} else {
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(family == AF_INET ? cache_4 : cache_6).clearBadNodes();
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}
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}
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std::shared_ptr<Node>
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NodeCache::NodeMap::getNode(const InfoHash& id)
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{
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auto wn = find(id);
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if (wn == end())
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return {};
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if (auto n = wn->second.lock())
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return n;
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erase(wn);
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return {};
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}
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std::shared_ptr<Node>
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NodeCache::NodeMap::getNode(const InfoHash& id, const SockAddr& addr, time_point now, bool confirm)
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{
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auto it = emplace(id, std::weak_ptr<Node>{});
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auto node = it.first->second.lock();
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if (not node) {
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node = std::make_shared<Node>(id, addr);
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it.first->second = node;
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} else if (confirm || node->time < now - Node::NODE_EXPIRE_TIME) {
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node->update(addr);
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}
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return node;
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}
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void
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NodeCache::NodeMap::clearBadNodes() {
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for (auto it = cbegin(); it != cend();) {
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if (auto n = it->second.lock()) {
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n->reset();
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++it;
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} else {
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erase(it++);
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}
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}
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}
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}
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