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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.
#pragma once
#include <functional>
#include <limits>
#include <map>
#include <string>
#include <utility>
#include <boost/multi_index_container.hpp>
#include <boost/multi_index/member.hpp>
#include <boost/multi_index/ordered_index.hpp>
#include <boost/optional/optional.hpp>
#include "net/http_client.h"
namespace cryptonote
{
namespace bootstrap_node
{
struct node_info
{
std::string address;
boost::optional<epee::net_utils::http::login> credentials;
};
struct selector
{
virtual void handle_result(const std::string &address, bool success) = 0;
virtual boost::optional<node_info> next_node() = 0;
};
class selector_auto : public selector
{
public:
selector_auto(std::function<std::map<std::string, bool>()> get_nodes, size_t max_nodes = 1000)
: m_get_nodes(std::move(get_nodes))
, m_max_nodes(max_nodes)
{}
void handle_result(const std::string &address, bool success) final;
boost::optional<node_info> next_node() final;
private:
bool has_at_least_one_good_node() const;
void append_new_nodes();
void truncate();
private:
struct node
{
std::string address;
size_t fails;
void handle_result(bool success);
};
struct by_address {};
struct by_fails {};
typedef boost::multi_index_container<
node,
boost::multi_index::indexed_by<
boost::multi_index::ordered_unique<boost::multi_index::tag<by_address>, boost::multi_index::member<node, std::string, &node::address>>,
boost::multi_index::ordered_non_unique<boost::multi_index::tag<by_fails>, boost::multi_index::member<node, size_t, &node::fails>>
>
> nodes_list;
const std::function<std::map<std::string, bool>()> m_get_nodes;
const size_t m_max_nodes;
nodes_list m_nodes;
};
}
}
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