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// Copyright (c) 2020, The Monero Project
//
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without modification, are
// permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this list of
// conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice, this list
// of conditions and the following disclaimer in the documentation and/or other
// materials provided with the distribution.
//
// 3. Neither the name of the copyright holder nor the names of its contributors may be
// used to endorse or promote products derived from this software without specific
// prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include "bootstrap_node_selector.h"
#include "crypto/crypto.h"
namespace cryptonote
{
namespace bootstrap_node
{
void selector_auto::node::handle_result(bool success)
{
if (!success)
{
fails = std::min(std::numeric_limits<size_t>::max() - 2, fails) + 2;
}
else
{
fails = std::max(std::numeric_limits<size_t>::min() + 2, fails) - 2;
}
}
void selector_auto::handle_result(const std::string &address, bool success)
{
auto &nodes_by_address = m_nodes.get<by_address>();
const auto it = nodes_by_address.find(address);
if (it != nodes_by_address.end())
{
nodes_by_address.modify(it, [success](node &entry) {
entry.handle_result(success);
});
}
}
boost::optional<node_info> selector_auto::next_node()
{
if (!has_at_least_one_good_node())
{
append_new_nodes();
}
if (m_nodes.empty())
{
return {};
}
auto node = m_nodes.get<by_fails>().begin();
const size_t count = std::distance(node, m_nodes.get<by_fails>().upper_bound(node->fails));
std::advance(node, crypto::rand_idx(count));
return {{node->address, {}}};
}
bool selector_auto::has_at_least_one_good_node() const
{
return !m_nodes.empty() && m_nodes.get<by_fails>().begin()->fails == 0;
}
void selector_auto::append_new_nodes()
{
bool updated = false;
for (const auto &node : m_get_nodes())
{
const auto &address = node.first;
const auto &white = node.second;
const size_t initial_score = white ? 0 : 1;
updated |= m_nodes.get<by_address>().insert({address, initial_score}).second;
}
if (updated)
{
truncate();
}
}
void selector_auto::truncate()
{
const size_t total = m_nodes.size();
if (total > m_max_nodes)
{
auto &nodes_by_fails = m_nodes.get<by_fails>();
auto from = nodes_by_fails.rbegin();
std::advance(from, total - m_max_nodes);
nodes_by_fails.erase(from.base(), nodes_by_fails.end());
}
}
}
}
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