text: // Copyright (c) 2017-2018, The Moneda 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 <string>
  #include <boost/thread/mutex.hpp>
  #include "include_base_utils.h"
  #include "net/http_client.h"
  
  namespace tools
  {
  
  class NodeRPCProxy
  {
  public:
    NodeRPCProxy(epee::net_utils::http::http_simple_client &http_client, boost::mutex &mutex);
  
    void invalidate();
  
    boost::optional<std::string> get_rpc_version(uint32_t &version) const;
    boost::optional<std::string> get_height(uint64_t &height) const;
    void set_height(uint64_t h);
    boost::optional<std::string> get_target_height(uint64_t &height) const;
    boost::optional<std::string> get_earliest_height(uint8_t version, uint64_t &earliest_height) const;
    boost::optional<std::string> get_dynamic_per_kb_fee_estimate(uint64_t grace_blocks, uint64_t &fee) const;
  
  private:
    epee::net_utils::http::http_simple_client &m_http_client;
    boost::mutex &m_daemon_rpc_mutex;
  
    mutable uint64_t m_height;
    mutable time_t m_height_time;
    mutable uint64_t m_earliest_height[256];
    mutable uint64_t m_dynamic_per_kb_fee_estimate;
    mutable uint64_t m_dynamic_per_kb_fee_estimate_cached_height;
    mutable uint64_t m_dynamic_per_kb_fee_estimate_grace_blocks;
    mutable uint32_t m_rpc_version;
    mutable uint64_t m_target_height;
    mutable time_t m_target_height_time;
  };
  
  }
  