Clean the Config module, use static things instead of a stupid singleton

louloulibs/config/config.cpp

@@ -6,22 +6,21 @@
 #include <stdlib.h>
 
 std::string Config::filename{};
-bool Config::file_must_exist = false;
+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)
 {
-  Config* self = Config::instance().get();
+  auto it = Config::values.find(option);
-  auto it = self->values.find(option);
 
-  if (it == self->values.end())
+  if (it == Config::values.end())
     return def;
   return it->second;
 }
 
 int Config::get_int(const std::string& option, const int& def)
 {
-  Config* self = Config::instance().get();
+  std::string res = Config::get(option, "");
-  std::string res = self->get(option, "");
   if (!res.empty())
     return atoi(res.c_str());
   else
@@ -30,65 +29,48 @@ int Config::get_int(const std::string& option, const int& def)
 
 void Config::set(const std::string& option, const std::string& value, bool save)
 {
-  Config* self = Config::instance().get();
+  Config::values[option] = value;
-  self->values[option] = value;
   if (save)
     {
-      self->save_to_file();
+      Config::save_to_file();
-      self->trigger_configuration_change();
+      Config::trigger_configuration_change();
     }
 }
 
 void Config::connect(t_config_changed_callback callback)
 {
-  Config* self = Config::instance().get();
+    Config::callbacks.push_back(callback);
-  self->callbacks.push_back(callback);
 }
 
-void Config::close()
+void Config::clear()
 {
-  Config* self = Config::instance().get();
+  Config::values.clear();
-  self->values.clear();
-  Config::instance().reset();
 }
 
 /**
  * Private methods
  */
-
 void Config::trigger_configuration_change()
 {
   std::vector<t_config_changed_callback>::iterator it;
-  for (it = this->callbacks.begin(); it < this->callbacks.end(); ++it)
+  for (it = Config::callbacks.begin(); it < Config::callbacks.end(); ++it)
       (*it)();
 }
 
-std::unique_ptr<Config>& Config::instance()
+bool Config::read_conf(const std::string& name)
 {
-  static std::unique_ptr<Config> instance;
+  if (!name.empty())
+    Config::filename = name;
 
-  if (!instance)
+  std::ifstream file(Config::filename.data());
-    {
-      instance = std::make_unique<Config>();
-      instance->read_conf();
-    }
-  return instance;
-}
-
-bool Config::read_conf()
-{
-  std::ifstream file;
-  file.open(filename.data());
   if (!file.is_open())
-    {
-      if (Config::file_must_exist)
     {
       perror(("Error while opening file " + filename + " for reading.").c_str());
-          file.exceptions(std::ifstream::failbit);
-        }
       return false;
     }
 
+  Config::clear();
+
   std::string line;
   size_t pos;
   std::string option;
@@ -103,20 +85,18 @@ bool Config::read_conf()
         continue ;
       option = line.substr(0, pos);
       value = line.substr(pos+1);
-      this->values[option] = value;
+      Config::values[option] = value;
     }
-  return true;
 }
 
-void Config::save_to_file() const
+void Config::save_to_file()
 {
-  std::ofstream file(this->filename.data());
+  std::ofstream file(Config::filename.data());
   if (file.fail())
     {
       std::cerr << "Could not save config file." << std::endl;
       return ;
     }
-  for (auto& it: this->values)
+  for (const auto& it: Config::values)
     file << it.first << "=" << it.second << '\n';
-  file.close();
 }

louloulibs/config/config.hpp

@@ -60,38 +60,34 @@ public:
    * Destroy the instance, forcing it to be recreated (with potentially
    * different parameters) the next time it’s needed.
    */
-  static void close();
+  static void clear();
+  /**
+   * Read the configuration file at the given path.
+   */
+  static bool read_conf(const std::string& name="");
+  /**
+   * Get the filename
+   */
+  static const std::string& get_filename()
+  { return Config::filename; }
+
+private:
   /**
    * Set the value of the filename to use, before calling any method.
    */
   static std::string filename;
-  /**
-   * Set to true if you want an exception to be raised if the file does not
-   * exist when reading it.
-   */
-  static bool file_must_exist;
-
-private:
-  /**
-   * Get the singleton instance
-   */
-  static std::unique_ptr<Config>& instance();
-  /**
-   * Read the configuration file at the given path.
-   */
-  bool read_conf();
   /**
    * Write all the config values into the configuration file
    */
-  void save_to_file() const;
+  static void save_to_file();
   /**
    * Call all the callbacks previously registered using connect().
    * This is used to notify any class that a configuration change occured.
    */
-  void trigger_configuration_change();
+  static void trigger_configuration_change();
 
-  std::map<std::string, std::string> values;
+  static std::map<std::string, std::string> values;
-  std::vector<t_config_changed_callback> callbacks;
+  static std::vector<t_config_changed_callback> callbacks;
 
 };
 

louloulibs/utils/reload.cpp

@@ -3,9 +3,7 @@
 
 void reload_process()
 {
-  // Closing the config will just force it to be reopened the next time
+  Config::read_conf();
-  // a configuration option is needed
-  Config::close();
   // Destroy the logger instance, to be recreated the next time a log
   // line needs to be written
   Logger::instance().reset();

src/main.cpp

@@ -47,7 +47,7 @@ static void sigint_handler(int sig, siginfo_t*, void*)
 {
   // We reset the SIGTERM or SIGINT (the one that didn't trigger this
   // handler) signal handler to its default value.  This avoid calling this
-  // handler twice, if the process receive both signals in a quick
+  // handler twice, if the process receives both signals in a quick
   // succession.
   int sig_to_reset = (sig == SIGINT? SIGTERM: SIGINT);
   sigset_t mask;
@@ -70,24 +70,16 @@ static void sigusr_handler(int, siginfo_t*, void*)
 
 int main(int ac, char** av)
 {
-  if (ac > 1)
+  const std::string conf_filename = ac > 1 ? av[1] : xdg_config_path("biboumi.cfg");
-    Config::filename = av[1];
+  std::cerr << "Using configuration file: " << conf_filename << std::endl;
-  else
-    Config::filename = xdg_config_path("biboumi.cfg");
 
-  Config::file_must_exist = true;
+  if (!Config::read_conf(conf_filename))
-  std::cerr << "Using configuration file: " << Config::filename << std::endl;
-
-  std::string password;
-  try { // The file must exist
-    password = Config::get("password", "");
-  }
-  catch (const std::ios::failure& e) {
     return config_help("");
-  }
+
-  const std::string hostname = Config::get("hostname", "");
+  const std::string password = Config::get("password", "");
   if (password.empty())
     return config_help("password");
+  const std::string hostname = Config::get("hostname", "");
   if (hostname.empty())
     return config_help("hostname");
 

tests/config.cpp

@@ -4,18 +4,18 @@
 
 TEST_CASE("Config basic")
 {
-  Config::filename = "test.cfg";
+  // Write a value in the config file
-  Config::file_must_exist = false;
+  Config::read_conf("test.cfg");
   Config::set("coucou", "bonjour", true);
-  Config::close();
+  Config::clear();
 
   bool error = false;
   try
     {
-      Config::file_must_exist = true;
+      CHECK(Config::read_conf());
       CHECK(Config::get("coucou", "") == "bonjour");
       CHECK(Config::get("does not exist", "default") == "default");
-      Config::close();
+      Config::clear();
     }
   catch (const std::ios::failure& e)
     {