NS-3 based Named Data Networking (NDN) simulator
ndnSIM 2.3: NDN, CCN, CCNx, content centric networks
API Documentation
config-file.cpp
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1 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
22 #include "config-file.hpp"
23 
24 #include <boost/property_tree/ini_parser.hpp>
25 #include <boost/filesystem.hpp>
26 
27 namespace ndn {
28 
30  : m_path(findConfigFile())
31 {
32  if (open())
33  {
34  parse();
35  close();
36  }
37 }
38 
40 {
41  if (m_input.is_open())
42  {
43  m_input.close();
44  }
45 }
46 
47 boost::filesystem::path
48 ConfigFile::findConfigFile()
49 {
50  using namespace boost::filesystem;
51 
52 #ifdef NDN_CXX_HAVE_TESTS
53  if (std::getenv("TEST_HOME"))
54  {
55  path testHome(std::getenv("TEST_HOME"));
56  testHome /= ".ndn/client.conf";
57  if (exists(testHome))
58  {
59  return absolute(testHome);
60  }
61  }
62 #endif // NDN_CXX_HAVE_TESTS
63 
64  if (std::getenv("HOME"))
65  {
66  path home(std::getenv("HOME"));
67  home /= ".ndn/client.conf";
68  if (exists(home))
69  {
70  return absolute(home);
71  }
72  }
73 
74 #ifdef NDN_CXX_SYSCONFDIR
75  path sysconfdir(NDN_CXX_SYSCONFDIR);
76  sysconfdir /= "ndn/client.conf";
77 
78  if (exists(sysconfdir))
79  {
80  return absolute(sysconfdir);
81  }
82 #endif // NDN_CXX_SYSCONFDIR
83 
84  path etc("/etc/ndn/client.conf");
85  if (exists(etc))
86  {
87  return absolute(etc);
88  }
89 
90  return path();
91 }
92 
93 
94 
95 bool
96 ConfigFile::open()
97 {
98  if (m_path.empty())
99  {
100  return false;
101  }
102 
103  m_input.open(m_path.c_str());
104  if (!m_input.good() || !m_input.is_open())
105  {
106  return false;
107  }
108  return true;
109 }
110 
111 void
112 ConfigFile::close()
113 {
114  if (m_input.is_open())
115  {
116  m_input.close();
117  }
118 }
119 
120 
121 const ConfigFile::Parsed&
122 ConfigFile::parse()
123 {
124  if (m_path.empty())
125  {
126  BOOST_THROW_EXCEPTION(Error("Failed to locate configuration file for parsing"));
127  }
128  else if (!m_input.is_open() && !open())
129  {
130  BOOST_THROW_EXCEPTION(Error("Failed to open configuration file for parsing"));
131  }
132 
133  try
134  {
135  boost::property_tree::read_ini(m_input, m_config);
136  }
137  catch (boost::property_tree::ini_parser_error& error)
138  {
139  std::stringstream msg;
140  msg << "Failed to parse configuration file";
141  msg << " " << m_path;
142  msg << " " << error.message() << " line " << error.line();
143  BOOST_THROW_EXCEPTION(Error(msg.str()));
144  }
145  return m_config;
146 }
147 
148 }
Copyright (c) 2011-2015 Regents of the University of California.
boost::property_tree::ptree Parsed
Definition: config-file.hpp:62
ConfigFile()
Locate, open, and parse a library configuration file.
Definition: config-file.cpp:29