text: // Copyright (c) 2014-2020, The Monero Project
  // Copyright (c) 2018-2021, The Scala Network 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 <boost/optional/optional.hpp>
  
  #include "common/http_connection.h"
  #include "common/scoped_message_writer.h"
  #include "rpc/core_rpc_server_commands_defs.h"
  #include "storages/http_abstract_invoke.h"
  #include "net/http_auth.h"
  #include "net/http_client.h"
  #include "net/net_ssl.h"
  #include "string_tools.h"
  
  namespace tools
  {
    class t_rpc_client final
    {
    private:
      epee::net_utils::http::http_simple_client m_http_client;
    public:
      t_rpc_client(
          uint32_t ip
        , uint16_t port
        , boost::optional<epee::net_utils::http::login> user
        , epee::net_utils::ssl_options_t ssl_options
        )
        : m_http_client{}
      {
        m_http_client.set_server(
          epee::string_tools::get_ip_string_from_int32(ip), std::to_string(port), std::move(user), std::move(ssl_options)
        );
      }
  
      template <typename T_req, typename T_res>
      bool basic_json_rpc_request(
          T_req & req
        , T_res & res
        , std::string const & method_name
        )
      {
        t_http_connection connection(&m_http_client);
  
        bool ok = connection.is_open();
        if (!ok)
        {
          fail_msg_writer() << "Couldn't connect to daemon: " << m_http_client.get_host() << ":" << m_http_client.get_port();
          return false;
        }
        ok = epee::net_utils::invoke_http_json_rpc("/json_rpc", method_name, req, res, m_http_client, t_http_connection::TIMEOUT());
        if (!ok)
        {
          fail_msg_writer() << "basic_json_rpc_request: Daemon request failed";
          return false;
        }
        else
        {
          return true;
        }
      }
  
      template <typename T_req, typename T_res>
      bool json_rpc_request(
          T_req & req
        , T_res & res
        , std::string const & method_name
        , std::string const & fail_msg
        )
      {
        t_http_connection connection(&m_http_client);
  
        bool ok = connection.is_open();
        if (!ok)
        {
          fail_msg_writer() << "Couldn't connect to daemon: " << m_http_client.get_host() << ":" << m_http_client.get_port();
          return false;
        }
        ok = epee::net_utils::invoke_http_json_rpc("/json_rpc", method_name, req, res, m_http_client, t_http_connection::TIMEOUT());
        if (!ok || res.status != CORE_RPC_STATUS_OK) // TODO - handle CORE_RPC_STATUS_BUSY ?
        {
          fail_msg_writer() << fail_msg << " -- json_rpc_request: " << res.status;
          return false;
        }
        else
        {
          return true;
        }
      }
  
      template <typename T_req, typename T_res>
      bool rpc_request(
          T_req & req
        , T_res & res
        , std::string const & relative_url
        , std::string const & fail_msg
        )
      {
        t_http_connection connection(&m_http_client);
  
        bool ok = connection.is_open();
        if (!ok)
        {
          fail_msg_writer() << "Couldn't connect to daemon: " << m_http_client.get_host() << ":" << m_http_client.get_port();
          return false;
        }
        ok = epee::net_utils::invoke_http_json(relative_url, req, res, m_http_client, t_http_connection::TIMEOUT());
        if (!ok || res.status != CORE_RPC_STATUS_OK) // TODO - handle CORE_RPC_STATUS_BUSY ?
        {
          fail_msg_writer() << fail_msg << "-- rpc_request: " << res.status;
          return false;
        }
        else
        {
          return true;
        }
      }
  
      bool check_connection()
      {
        t_http_connection connection(&m_http_client);
        return connection.is_open();
      }
    };
  }
  