mirror of
https://github.com/PurpleI2P/i2pd.git
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108 lines
3.1 KiB
C++
108 lines
3.1 KiB
C++
#ifndef CONFIG_H
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#define CONFIG_H
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#include <string>
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#include <boost/program_options/options_description.hpp>
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#include <boost/program_options/variables_map.hpp>
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/**
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* Functions to parse and store i2pd parameters
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*
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* General usage flow:
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* Init() -- early as possible
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* ParseCmdline() -- somewhere close to main()
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* ParseConfig() -- after detecting path to config
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* Finalize() -- right after all Parse*() functions called
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* GetOption() -- may be called after Finalize()
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*/
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namespace i2p {
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namespace config {
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extern boost::program_options::variables_map m_Options;
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/**
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* @brief Initialize list of acceptable parameters
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*
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* Should be called before any Parse* functions.
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*/
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void Init();
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/**
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* @brief Parse cmdline parameters, and show help if requested
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* @param argc Cmdline arguments count, should be passed from main().
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* @param argv Cmdline parameters array, should be passed from main()
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*
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* If --help is given in parameters, shows it's list with description
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* terminates the program with exitcode 0.
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*
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* In case of parameter misuse boost throws an exception.
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* We internally handle type boost::program_options::unknown_option,
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* and then terminate program with exitcode 1.
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*
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* Other exceptions will be passed to higher level.
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*/
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void ParseCmdline(int argc, char* argv[]);
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/**
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* @brief Load and parse given config file
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* @param path Path to config file
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*
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* If error occured when opening file path is points to,
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* we show the error message and terminate program.
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*
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* In case of parameter misuse boost throws an exception.
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* We internally handle type boost::program_options::unknown_option,
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* and then terminate program with exitcode 1.
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*
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* Other exceptions will be passed to higher level.
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*/
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void ParseConfig(const std::string& path);
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/**
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* @brief Used to combine options from cmdline, config and default values
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*/
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void Finalize();
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/* @brief Accessor to parameters by name
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* @param name Name of the requested parameter
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* @param value Variable where to store option
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* @return this function returns false if parameter not found
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*
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* Example: uint16_t port; GetOption("sam.port", port);
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*/
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template<typename T>
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bool GetOption(const char *name, T& value) {
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if (!m_Options.count(name))
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return false;
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value = m_Options[name].as<T>();
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return true;
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}
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/**
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* @brief Set value of given parameter
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* @param name Name of settable parameter
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* @param value New parameter value
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* @return true if value set up successful, false otherwise
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*
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* Example: uint16_t port = 2827; SetOption("bob.port", port);
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*/
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template<typename T>
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bool SetOption(const char *name, const T& value) {
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if (!m_Options.count(name))
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return false;
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m_Options.at(name).value() = value;
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notify(m_Options);
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return true;
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}
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/**
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* @brief Check is value explicitly given or default
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* @param name Name of checked parameter
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* @return true if value set to default, false othervise
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*/
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bool IsDefault(const char *name);
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}
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}
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#endif // CONFIG_H
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