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/*
* Copyright (C) 2012-2014 Tobias Brunner
* Copyright (C) 2007 Martin Willi
* HSR Hochschule fuer Technik Rapperswil
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*/
/**
* @defgroup plugin_loader plugin_loader
* @{ @ingroup plugins
*/
#ifndef PLUGIN_LOADER_H_
#define PLUGIN_LOADER_H_
typedef struct plugin_loader_t plugin_loader_t;
#include <collections/enumerator.h>
#include <utils/debug.h>
/* to avoid circular references we can't include plugin_feature.h */
struct plugin_feature_t;
/**
* The plugin_loader loads plugins from a directory and initializes them
*/
struct plugin_loader_t {
/**
* Add static plugin features, not loaded via plugins.
*
* Similar to features provided by plugins they are evaluated during load(),
* and unloaded when unload() is called.
*
* If critical is TRUE load() will fail if any of the added features could
* not be loaded.
*
* If a reload callback function is given, it gets invoked for the
* registered feature set when reload() is invoked on the plugin_loader.
*
* @note The name should be unique otherwise a plugin with the same name is
* not loaded.
*
* @param name name of the component adding the features
* @param features array of plugin features
* @param count number of features in the array
* @param critical TRUE if the features are critical
* @param reload feature reload callback, or NULL
* @param reload_data user data to pass to reload callback
*/
void (*add_static_features) (plugin_loader_t *this, const char *name,
struct plugin_feature_t *features, int count,
bool critical, bool (*reload)(void*),
void *reload_data);
/**
* Load a list of plugins.
*
* Each plugin in list may have an ending exclamation mark (!) to mark it
* as a critical plugin. If loading a critical plugin fails, plugin loading
* is aborted and FALSE is returned.
*
* Additional paths can be added with add_path(), these will be searched
* for the plugins first, in the order they were added, then the default
* path follows.
*
* If \<ns>.load_modular is enabled (where \<ns> is lib->ns) the plugins to
* load are determined via a load option in their respective plugin config
* section e.g. \<ns>.plugins.\<plugin>.load = <priority|bool>.
* The order is determined by the configured priority. If two plugins have
* the same priority the order as seen in list is preserved. Plugins not
* found in list are loaded first, in alphabetical order.
*
* @note Even though this method could be called multiple times this is
* currently not really supported in regards to plugin features and their
* dependencies (in particular soft dependencies).
*
* @param list space separated list of plugins to load
* @return TRUE if all critical plugins loaded successfully
*/
bool (*load)(plugin_loader_t *this, char *list);
/**
* Add an additional search path for plugins.
*
* These will be searched in the order they were added.
*
* @param path path containing loadable plugins
*/
void (*add_path)(plugin_loader_t *this, char *path);
/**
* Reload the configuration of one or multiple plugins.
*
* @param space separated plugin names to reload, NULL for all
* @return number of plugins that did support reloading
*/
u_int (*reload)(plugin_loader_t *this, char *list);
/**
* Unload all loaded plugins.
*/
void (*unload)(plugin_loader_t *this);
/**
* Create an enumerator over all loaded plugins.
*
* In addition to the plugin, the enumerator optionally provides a list of
* pointers to plugin features currently loaded.
* This list has to be destroyed.
*
* @return enumerator over plugin_t*, linked_list_t*
*/
enumerator_t* (*create_plugin_enumerator)(plugin_loader_t *this);
/**
* Check if the given feature is available and loaded.
*
* @param feature feature to check
* @return TRUE if feature available
*/
bool (*has_feature)(plugin_loader_t *this, struct plugin_feature_t feature);
/**
* Get a simple list the names of all loaded plugins.
*
* The function returns internal data, do not free.
*
* @return list of the names of all loaded plugins
*/
char* (*loaded_plugins)(plugin_loader_t *this);
/**
* Log status about loaded plugins and features.
*
* @param level log level to use
*/
void (*status)(plugin_loader_t *this, level_t level);
/**
* Unload loaded plugins, destroy plugin_loader instance.
*/
void (*destroy)(plugin_loader_t *this);
};
/**
* Create a plugin_loader instance.
*
* @return plugin loader instance
*/
plugin_loader_t *plugin_loader_create();
/**
* Convenience function to add plugin directories for the given plugins within
* the given base directory according to the conventions in the src/build tree.
*
* @param basedir base directory
* @param plugins space separated list of plugins
*/
void plugin_loader_add_plugindirs(char *basedir, char *plugins);
#ifdef STATIC_PLUGIN_CONSTRUCTORS
/**
* Register a plugin constructor in case of static builds.
*
* @param name name of the plugin
* @param constructor constructor to register (set to NULL to unregister)
*/
void plugin_constructor_register(char *name, void *constructor);
#endif
#endif /** PLUGIN_LOADER_H_ @}*/
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