~singpolyma/biboumi

ref: eac144acdaca02f018bddde5f623fba3e8cd4ad9 biboumi/src/config/config.cpp -rw-r--r-- 2.7 KiB
eac144ac — louiz’ Configuration options can be overridden by setting env values 5 years ago
                                                                                
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
#include <config/config.hpp>
#include <utils/tolower.hpp>

#include <iostream>
#include <cstring>

#include <cstdlib>

using namespace std::string_literals;

extern char** environ;

std::string Config::filename{};
std::map<std::string, std::string> Config::values{};
std::vector<t_config_changed_callback> Config::callbacks{};

std::string Config::get(const std::string& option, const std::string& def)
{
  auto it = Config::values.find(option);

  if (it == Config::values.end())
    return def;
  return it->second;
}

int Config::get_int(const std::string& option, const int& def)
{
  std::string res = Config::get(option, "");
  if (!res.empty())
    return std::atoi(res.c_str());
  else
    return def;
}

void Config::set(const std::string& option, const std::string& value, bool save)
{
  Config::values[option] = value;
  if (save)
    {
      Config::save_to_file();
      Config::trigger_configuration_change();
    }
}

void Config::connect(const t_config_changed_callback& callback)
{
    Config::callbacks.push_back(callback);
}

void Config::clear()
{
  Config::values.clear();
}

/**
 * Private methods
 */
void Config::trigger_configuration_change()
{
  std::vector<t_config_changed_callback>::iterator it;
  for (it = Config::callbacks.begin(); it < Config::callbacks.end(); ++it)
      (*it)();
}

bool Config::read_conf(const std::string& name)
{
  if (!name.empty())
    Config::filename = name;

  std::ifstream file(Config::filename.data());
  if (!file.is_open())
    {
      std::cerr << "Error while opening file " << filename << " for reading: " << strerror(errno) << std::endl;
      return false;
    }

  Config::clear();

  auto parse_line = [](const std::string& line, const bool env)
  {
    static const auto env_option_prefix = "BIBOUMI_"s;

    if (line == "" || line[0] == '#')
      return;
    size_t pos = line.find('=');
    if (pos == std::string::npos)
      return;
    std::string option = line.substr(0, pos);
    std::string value = line.substr(pos+1);
    if (env)
      {
        auto a = option.substr(0, env_option_prefix.size());
        if (a == env_option_prefix)
          option = utils::tolower(option.substr(env_option_prefix.size()));
        else
          return;
      }
    Config::values[option] = value;
  };

  std::string line;
  while (file.good())
    {
      std::getline(file, line);
      parse_line(line, false);
    }

  char** env_line = environ;
  while (*env_line)
    {
      parse_line(*env_line, true);
      env_line++;
    }
  return true;
}

void Config::save_to_file()
{
  std::ofstream file(Config::filename.data());
  if (file.fail())
    {
      std::cerr << "Could not save config file." << std::endl;
      return ;
    }
  for (const auto& it: Config::values)
    file << it.first << "=" << it.second << '\n';
}