From 42a7a4dd320f002457843b4418314f43a70c0c8f Mon Sep 17 00:00:00 2001
From: xiphon <xiphon@protonmail.com>
Date: Wed, 26 Feb 2020 12:37:28 +0000
Subject: daemon: auto public nodes - cache and prioritize most stable nodes

---
 src/rpc/bootstrap_node_selector.h | 103 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 103 insertions(+)
 create mode 100644 src/rpc/bootstrap_node_selector.h

(limited to 'src/rpc/bootstrap_node_selector.h')

diff --git a/src/rpc/bootstrap_node_selector.h b/src/rpc/bootstrap_node_selector.h
new file mode 100644
index 000000000..fc993719b
--- /dev/null
+++ b/src/rpc/bootstrap_node_selector.h
@@ -0,0 +1,103 @@
+// 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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