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/*
* Copyright (c) 2009-2015, Vsevolod Stakhov
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY AUTHOR ''AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL AUTHOR BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef RSPAMD_SYMBOLS_CACHE_H
#define RSPAMD_SYMBOLS_CACHE_H
#include "config.h"
#include "ucl.h"
#include <lua.h>
#include <event.h>
struct rspamd_task;
struct rspamd_config;
struct symbols_cache;
typedef void (*symbol_func_t)(struct rspamd_task *task, gpointer user_data);
enum rspamd_symbol_type {
SYMBOL_TYPE_NORMAL = (1 << 0),
SYMBOL_TYPE_VIRTUAL = (1 << 1),
SYMBOL_TYPE_CALLBACK = (1 << 2),
SYMBOL_TYPE_GHOST = (1 << 3),
SYMBOL_TYPE_SKIPPED = (1 << 4),
SYMBOL_TYPE_COMPOSITE = (1 << 5),
SYMBOL_TYPE_CLASSIFIER = (1 << 6),
SYMBOL_TYPE_FINE = (1 << 7)
};
/**
* Creates new cache structure
* @return
*/
struct symbols_cache* rspamd_symbols_cache_new (struct rspamd_config *cfg);
/**
* Remove the cache structure syncing data if needed
* @param cache
*/
void rspamd_symbols_cache_destroy (struct symbols_cache *cache);
/**
* Load symbols cache from file, must be called _after_ init_symbols_cache
*/
gboolean rspamd_symbols_cache_init (struct symbols_cache* cache);
/**
* Generic function to register a symbol
* @param cache
* @param name
* @param weight
* @param priority
* @param func
* @param user_data
* @param type
* @param parent
*/
gint rspamd_symbols_cache_add_symbol (struct symbols_cache *cache,
const gchar *name,
gint priority,
symbol_func_t func,
gpointer user_data,
enum rspamd_symbol_type type,
gint parent);
/**
* Add condition to the specific symbol in cache
* @param cache
* @param id id of symbol
* @param L lua state pointer
* @param cbref callback reference (returned by luaL_ref)
* @return TRUE if condition has been added
*/
gboolean rspamd_symbols_cache_add_condition (struct symbols_cache *cache,
gint id, lua_State *L, gint cbref);
/**
* Add delayed condition to the specific symbol in cache. So symbol can be absent
* to the moment of addition
* @param cache
* @param id id of symbol
* @param L lua state pointer
* @param cbref callback reference (returned by luaL_ref)
* @return TRUE if condition has been added
*/
gboolean rspamd_symbols_cache_add_condition_delayed (struct symbols_cache *cache,
const gchar *sym, lua_State *L, gint cbref);
/**
* Find symbol in cache by id and returns its id resolving virtual symbols if
* applicable
* @param cache
* @param name
* @return id of symbol or (-1) if a symbol has not been found
*/
gint rspamd_symbols_cache_find_symbol (struct symbols_cache *cache, const gchar *name);
/**
* Call function for cached symbol using saved callback
* @param task task object
* @param cache symbols cache
* @param saved_item pointer to currently saved item
*/
gboolean rspamd_symbols_cache_process_symbols (struct rspamd_task *task,
struct symbols_cache *cache);
/**
* Validate cache items agains theirs weights defined in metrics
* @param cache symbols cache
* @param cfg configuration
* @param strict do strict checks - symbols MUST be described in metrics
*/
gboolean rspamd_symbols_cache_validate (struct symbols_cache *cache,
struct rspamd_config *cfg,
gboolean strict);
/**
* Return statistics about the cache as ucl object (array of objects one per item)
* @param cache
* @return
*/
ucl_object_t *rspamd_symbols_cache_counters (struct symbols_cache * cache);
/**
* Start cache reloading
* @param cache
* @param ev_base
*/
void rspamd_symbols_cache_start_refresh (struct symbols_cache * cache,
struct event_base *ev_base);
/**
* Increases counter for a specific symbol
* @param cache
* @param symbol
*/
void rspamd_symbols_cache_inc_frequency (struct symbols_cache *cache,
const gchar *symbol);
/**
* Add dependency relation between two symbols identified by id (source) and
* a symbolic name (destination). Destination could be virtual or real symbol.
* Callback destinations are not yet supported.
* @param id_from source symbol
* @param to destination name
*/
void rspamd_symbols_cache_add_dependency (struct symbols_cache *cache,
gint id_from, const gchar *to);
/**
* Add delayed dependency that is resolved on cache post-load routine
* @param cache
* @param from
* @param to
*/
void rspamd_symbols_cache_add_delayed_dependency (struct symbols_cache *cache,
const gchar *from, const gchar *to);
#endif
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