initial import of Monero base code

src/cryptonote_basic/connection_context.h

@@ -0,0 +1,153 @@
+// Copyright (c) 2014-2023, 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.
+// 
+// Parts of this file are originally copyright (c) 2012-2013 The Cryptonote developers
+// Parts of this file are originally copyright (c) 2006-2013, Andrey N. Sabelnikov, www.sabelnikov.net
+
+#pragma once
+#include <unordered_set>
+#include <atomic>
+#include <algorithm>
+#include <boost/date_time/posix_time/posix_time.hpp>
+#include "net/net_utils_base.h"
+#include "crypto/hash.h"
+
+namespace cryptonote
+{
+  struct cryptonote_connection_context: public epee::net_utils::connection_context_base
+  {
+    cryptonote_connection_context(): m_state(state_before_handshake), m_remote_blockchain_height(0), m_last_response_height(0),
+        m_last_request_time(boost::date_time::not_a_date_time), m_callback_request_count(0),
+        m_last_known_hash(crypto::null_hash), m_pruning_seed(0), m_rpc_port(0), m_rpc_credits_per_hash(0), m_anchor(false), m_score(0),
+        m_expect_response(0), m_expect_height(0), m_num_requested(0) {}
+
+    enum state
+    {
+      state_before_handshake = 0, //default state
+      state_synchronizing,
+      state_standby,
+      state_idle,
+      state_normal
+    };
+
+    /*
+      This class was originally from the EPEE module. It is identical in function to std::atomic<uint32_t> except
+      that it has copy-construction and copy-assignment defined, which means that earliers devs didn't have to write
+      custom copy-contructors and copy-assingment operators for the outer class, cryptonote_connection_context.
+      cryptonote_connection_context should probably be refactored because it is both trying to be POD-like while
+      also (very loosely) controlling access to its atomic members.
+    */
+    class copyable_atomic: public std::atomic<uint32_t>
+    {
+    public:
+      copyable_atomic()
+      {};
+      copyable_atomic(uint32_t value)
+      { store(value); }
+      copyable_atomic(const copyable_atomic& a):std::atomic<uint32_t>(a.load())
+      {}
+      copyable_atomic& operator= (const copyable_atomic& a)
+      {
+        store(a.load());
+        return *this;
+      }
+      uint32_t operator++()
+      {
+        return std::atomic<uint32_t>::operator++();
+      }
+      uint32_t operator++(int fake)
+      {
+        return std::atomic<uint32_t>::operator++(fake);
+      }
+    };
+
+    static constexpr int handshake_command() noexcept { return 1001; }
+    bool handshake_complete() const noexcept { return m_state != state_before_handshake; }
+
+    //! \return Maximum number of bytes permissible for `command`.
+    static size_t get_max_bytes(int command) noexcept;
+
+    state m_state;
+    std::vector<std::pair<crypto::hash, uint64_t>> m_needed_objects;
+    std::unordered_set<crypto::hash> m_requested_objects;
+    uint64_t m_remote_blockchain_height;
+    uint64_t m_last_response_height;
+    boost::posix_time::ptime m_last_request_time;
+    copyable_atomic m_callback_request_count; //in debug purpose: problem with double callback rise
+    crypto::hash m_last_known_hash;
+    uint32_t m_pruning_seed;
+    uint16_t m_rpc_port;
+    uint32_t m_rpc_credits_per_hash;
+    bool m_anchor;
+    int32_t m_score;
+    int m_expect_response;
+    uint64_t m_expect_height;
+    size_t m_num_requested;
+    copyable_atomic m_new_stripe_notification{0};
+    copyable_atomic m_idle_peer_notification{0};
+  };
+
+  inline std::string get_protocol_state_string(cryptonote_connection_context::state s)
+  {
+    switch (s)
+    {
+    case cryptonote_connection_context::state_before_handshake:
+      return "before_handshake";
+    case cryptonote_connection_context::state_synchronizing:
+      return "synchronizing";
+    case cryptonote_connection_context::state_standby:
+      return "standby";
+    case cryptonote_connection_context::state_idle:
+      return "idle";
+    case cryptonote_connection_context::state_normal:
+      return "normal";
+    default:
+      return "unknown";
+    }    
+  }
+
+  inline char get_protocol_state_char(cryptonote_connection_context::state s)
+  {
+    switch (s)
+    {
+    case cryptonote_connection_context::state_before_handshake:
+      return 'h';
+    case cryptonote_connection_context::state_synchronizing:
+      return 's';
+    case cryptonote_connection_context::state_standby:
+      return 'w';
+    case cryptonote_connection_context::state_idle:
+      return 'i';
+    case cryptonote_connection_context::state_normal:
+      return 'n';
+    default:
+      return 'u';
+    }
+  }
+
+}