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authorFlorent Le Coz <louiz@louiz.org>2013-11-10 20:47:11 +0100
committerFlorent Le Coz <louiz@louiz.org>2013-11-10 20:47:11 +0100
commitf0d9273da61ce154dbe460cf58c98de851d30615 (patch)
treebbca8a7adca39ced153a7f4d04d3964692bd4f5d /src/config
parent10d528717723a72dd3240c634980a461cf9fa2df (diff)
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Add a Config module, and use it to get the password from a file
Diffstat (limited to 'src/config')
-rw-r--r--src/config/config.cpp129
-rw-r--r--src/config/config.hpp111
2 files changed, 240 insertions, 0 deletions
diff --git a/src/config/config.cpp b/src/config/config.cpp
new file mode 100644
index 0000000..cad8216
--- /dev/null
+++ b/src/config/config.cpp
@@ -0,0 +1,129 @@
+#include <utils/make_unique.hpp>
+#include <config/config.hpp>
+
+#include <iostream>
+#include <sstream>
+
+std::string Config::filename = "./biboumi.cfg";
+bool Config::file_must_exist = false;
+
+std::string Config::get(const std::string& option, const std::string& def)
+{
+ Config* self = Config::instance().get();
+ auto it = self->values.find(option);
+
+ if (it == self->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 = self->get(option, "");
+ if (!res.empty())
+ return atoi(res.c_str());
+ else
+ return def;
+}
+
+void Config::set_int(const std::string& option, const int& value, bool save)
+{
+ std::ostringstream os;
+ os << value;
+ Config::set(option, os.str(), save);
+}
+
+void Config::set(const std::string& option, const std::string& value, bool save)
+{
+ Config* self = Config::instance().get();
+ self->values[option] = value;
+ if (save)
+ {
+ self->save_to_file();
+ self->trigger_configuration_change();
+ }
+}
+
+void Config::connect(t_config_changed_callback callback)
+{
+ Config* self = Config::instance().get();
+ self->callbacks.push_back(callback);
+}
+
+void Config::close()
+{
+ Config* self = Config::instance().get();
+ self->save_to_file();
+ 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)
+ (*it)();
+}
+
+std::unique_ptr<Config>& Config::instance()
+{
+ static std::unique_ptr<Config> instance;
+
+ if (!instance)
+ {
+ 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;
+ }
+
+ std::string line;
+ size_t pos;
+ std::string option;
+ std::string value;
+ while (file.good())
+ {
+ std::getline(file, line);
+ if (line == "" || line[0] == '#')
+ continue ;
+ pos = line.find('=');
+ if (pos == std::string::npos)
+ continue ;
+ option = line.substr(0, pos);
+ value = line.substr(pos+1);
+ this->values[option] = value;
+ }
+ return true;
+}
+
+void Config::save_to_file() const
+{
+ std::ofstream file(this->filename.data());
+ if (file.fail())
+ {
+ std::cerr << "Could not save config file." << std::endl;
+ return ;
+ }
+ for (auto& it: this->values)
+ file << it.first << "=" << it.second << std::endl;
+ file.close();
+}
diff --git a/src/config/config.hpp b/src/config/config.hpp
new file mode 100644
index 0000000..ea28388
--- /dev/null
+++ b/src/config/config.hpp
@@ -0,0 +1,111 @@
+/**
+ * Read the config file and save all the values in a map.
+ * Also, a singleton.
+ *
+ * Use Config::filename = "bla" to set the filename you want to use.
+ *
+ * If you want to exit if the file does not exist when it is open for
+ * reading, set Config::file_must_exist = true.
+ *
+ * Config::get() can the be used to access the values in the conf.
+ *
+ * Use Config::close() when you're done getting/setting value. This will
+ * save the config into the file.
+ */
+
+#ifndef CONFIG_INCLUDED
+# define CONFIG_INCLUDED
+
+#include <functional>
+#include <fstream>
+#include <memory>
+#include <vector>
+#include <string>
+#include <map>
+
+typedef std::function<void()> t_config_changed_callback;
+
+class Config
+{
+public:
+ Config(){};
+ ~Config(){};
+ /**
+ * returns a value from the config. If it doesn’t exist, use
+ * the second argument as the default.
+ * @param option The option we want
+ * @param def The default value in case the option does not exist
+ */
+ static std::string get(const std::string&, const std::string&);
+ /**
+ * returns a value from the config. If it doesn’t exist, use
+ * the second argument as the default.
+ * @param option The option we want
+ * @param def The default value in case the option does not exist
+ */
+ static int get_int(const std::string&, const int&);
+ /**
+ * Set a value for the given option. And write all the config
+ * in the file from which it was read if boolean is set.
+ * @param option The option to set
+ * @param value The value to use
+ * @param save if true, save the config file
+ */
+ static void set(const std::string&, const std::string&, bool save = false);
+ /**
+ * Set a value for the given option. And write all the config
+ * in the file from which it was read if boolean is set.
+ * @param option The option to set
+ * @param value The value to use
+ * @param save if true, save the config file
+ */
+ static void set_int(const std::string&, const int&, bool save = false);
+ /**
+ * Adds a function to a list. This function will be called whenever a
+ * configuration change occurs.
+ */
+ static void connect(t_config_changed_callback);
+ /**
+ * Close the config file, saving it to the file is save == true.
+ */
+ static void close();
+
+ /**
+ * 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;
+ /**
+ * Call all the callbacks previously registered using connect().
+ * This is used to notify any class that a configuration change occured.
+ */
+ void trigger_configuration_change();
+
+ std::map<std::string, std::string> values;
+ std::vector<t_config_changed_callback> callbacks;
+
+ Config(const Config&) = delete;
+ Config& operator=(const Config&) = delete;
+ Config(Config&&) = delete;
+ Config& operator=(Config&&) = delete;
+};
+
+#endif // CONFIG_INCLUDED