config.cpp


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#include "config.h"

#include <boost/property_tree/ptree.hpp>
#include <boost/property_tree/xml_parser.hpp>

#include <iostream>
#include <string>

namespace pt = boost::property_tree;
using namespace std::string_literals;

namespace {
 const std::string default_datapath {"/var/lib/whiteboard"};
 const uint64_t default_maxage{0}; // timeout in seconds; 0 = no timeout
 const std::string default_listen {"::1:9000"};
 const int default_threads{1};
}

Config::Config(const std::string& config_filename):
 m_dataPath{default_datapath},
 m_maxage{default_maxage},
 m_listenAddress{"::1"},
 m_listenPort{9000},
 m_threads{default_threads}
{

 try {
  pt::ptree tree;

  pt::read_xml(config_filename, tree, pt::xml_parser::no_comments | pt::xml_parser::trim_whitespace);

  m_dataPath = tree.get<std::string>("config.datapath", default_datapath);
  m_maxage = tree.get<uint64_t>("config.maxage", default_maxage);
  std::string listen {tree.get<std::string>("config.port", default_listen)};
  auto pos{listen.find_last_of(':')};
  if (pos == std::string::npos)
   throw std::runtime_error("Bad port address: "s + listen);

  m_listenAddress = listen.substr(0, pos);
  m_listenPort = std::stoi(listen.substr(pos + 1));
  if (m_listenPort < 0 || m_listenPort > 65535)
   throw std::runtime_error("Bad listen port: "s + std::to_string(m_listenPort));

  m_threads = tree.get<int>("config.threads", default_threads);
 } catch (const std::exception& ex) {
  std::cerr << "Error reading config file " << config_filename << ". Using defaults." << std::endl;
 }
}

std::string Config::getDataPath() const
{
 return m_dataPath;
}

uint64_t Config::getMaxage() const
{
 return m_maxage;
}

std::string Config::getListenAddress() const
{
 return m_listenAddress;
}

int Config::getListenPort() const
{
 return m_listenPort;
}

int Config::getThreads() const
{
 return m_threads;
}