127 lines
4.2 KiB
C++
127 lines
4.2 KiB
C++
#pragma once
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#include <mutex>
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#include <boost/property_tree/ptree.hpp>
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#include <boost/property_tree/ini_parser.hpp>
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#include "exception.hpp"
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#include "utils/string.hpp"
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namespace config
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{
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DefineBaseException(ConfigException);
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DefineChildException(UnexistingFileError, ConfigException);
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DefineChildException(ParseError, ConfigException);
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DefineChildException(MissingValueException, ConfigException);
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DefineChildException(MissingListValueException, ConfigException);
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DefineChildException(InvalidVariableException, ConfigException);
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DefineChildException(InvalidReferenceException, ConfigException);
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static std::recursive_mutex mtx;
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std::string get_bar_path();
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void set_bar_path(const std::string& path);
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void load(const std::string& path);
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void load(const char *dir, const std::string& path);
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// void reload();
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boost::property_tree::ptree get_tree();
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std::string build_path(const std::string& section, const std::string& key);
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template<typename T>
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T dereference_var(const std::string& ref_section, const std::string& ref_key, const std::string& var, const T ref_val)
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{
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std::lock_guard<std::recursive_mutex> lck(config::mtx);
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std::string::size_type n, m;
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if ((n = var.find("${")) != 0) return ref_val;
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if ((m = var.find("}")) != var.length()-1) return ref_val;
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auto path = var.substr(2, m-2);
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auto ref_path = build_path(ref_section, ref_key);
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if ((n = path.find(".")) == std::string::npos)
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throw InvalidVariableException("Invalid variable "+ ref_path +" => ${"+ path +"}");
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auto section = string::replace(path.substr(0, n), "BAR", get_bar_path());
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auto key = path.substr(n+1, path.length()-n-1);
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auto val = get_tree().get_optional<T>(build_path(section, key));
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if (val == boost::none)
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throw InvalidReferenceException("Variable defined at ["+ ref_path +"] points to a non existing parameter: ["+ build_path(section, key) +"]");
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auto str_val = get_tree().get<std::string>(build_path(section, key));
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return dereference_var<T>(section, key, str_val, val.get());
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}
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template<typename T>
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T get(const std::string& section, const std::string& key)
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{
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std::lock_guard<std::recursive_mutex> lck(config::mtx);
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auto val = get_tree().get_optional<T>(build_path(section, key));
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if (val == boost::none)
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throw MissingValueException("Missing property \""+ key +"\" in section ["+ section +"]");
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auto str_val = get_tree().get<std::string>(build_path(section, key));
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return dereference_var<T>(section, key, str_val, val.get());
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}
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template<typename T>
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T get(const std::string& section, const std::string& key, T default_value)
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{
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std::lock_guard<std::recursive_mutex> lck(config::mtx);
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auto val = get_tree().get_optional<T>(build_path(section, key));
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auto str_val = get_tree().get_optional<std::string>(build_path(section, key));
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return dereference_var<T>(section, key, str_val.get_value_or(""), val.get_value_or(default_value));
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}
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template<typename T>
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std::vector<T> get_list(const std::string& section, const std::string& key)
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{
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std::lock_guard<std::recursive_mutex> lck(config::mtx);
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std::vector<T> vec;
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boost::optional<T> value;
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while ((value = get_tree().get_optional<T>(build_path(section, key) + "-"+ std::to_string(vec.size()))) != boost::none) {
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auto str_val = get_tree().get<std::string>(build_path(section, key) + "-"+ std::to_string(vec.size()));
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vec.emplace_back(dereference_var<T>(section, key, str_val, value.get()));
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}
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if (vec.empty())
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throw MissingListValueException("Missing property \""+ key + "-0\" in section ["+ section +"]");
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return vec;
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}
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template<typename T>
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std::vector<T> get_list(const std::string& section, const std::string& key, std::vector<T> default_value)
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{
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std::lock_guard<std::recursive_mutex> lck(config::mtx);
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std::vector<T> vec;
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boost::optional<T> value;
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while ((value = get_tree().get_optional<T>(build_path(section, key) + "-"+ std::to_string(vec.size()))) != boost::none) {
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auto str_val = get_tree().get<std::string>(build_path(section, key) + "-"+ std::to_string(vec.size()));
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vec.emplace_back(dereference_var<T>(section, key, str_val, value.get()));
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}
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if (vec.empty())
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return default_value;
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else
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return vec;
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}
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}
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