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/**
* @file statfile.h
* Describes common methods for accessing statistics files and caching them in memory
*/
#ifndef RSPAMD_STATFILE_H
#define RSPAMD_STATFILE_H
#include "config.h"
#include "mem_pool.h"
#include "hash.h"
#define CHAIN_LENGTH 128
/**
* Common statfile header
*/
struct stat_file_header {
u_char magic[3]; /**< magic signature ('r' 's' 'd') */
u_char version[2]; /**< version of statfile (1.0) */
u_char padding[3]; /**< padding */
uint64_t create_time; /**< create time (time_t->uint64_t) */
} __attribute__((__packed__));
/**
* Block of data in statfile
*/
struct stat_file_block {
uint32_t hash1; /**< hash1 (also acts as index) */
uint32_t hash2; /**< hash2 */
float value; /**< float value */
uint32_t last_access; /**< last access to block since create time of file */
};
/**
* Statistic file
*/
struct stat_file {
struct stat_file_header header; /**< header */
struct stat_file_block blocks[1]; /**< first block of data */
};
/**
* Common view of statfile object
*/
typedef struct stat_file_s {
char *filename; /**< name of file */
int fd; /**< descriptor */
void *map; /**< mmaped area */
time_t open_time; /**< time when file was opened */
time_t access_time; /**< last access time */
size_t len; /**< length of file(in bytes) */
size_t blocks; /**< length of file in blocks */
gint *lock; /**< mutex */
} stat_file_t;
/**
* Statfiles pool
*/
typedef struct statfile_pool_s {
rspamd_hash_t *files; /**< hash table of opened files indexed by name */
int opened; /**< number of opened files */
size_t max; /**< maximum size */
size_t occupied; /**< current size */
memory_pool_t *pool; /**< memory pool object */
} statfile_pool_t;
/**
* Create new statfile pool
* @param max_size maximum size
* @return statfile pool object
*/
statfile_pool_t* statfile_pool_new (size_t max_size);
/**
* Open statfile and attach it to pool
* @param pool statfile pool object
* @param filename name of statfile to open
* @return 0 if specified statfile is attached and -1 in case of error
*/
int statfile_pool_open (statfile_pool_t *pool, char *filename);
/**
* Create new statfile but DOES NOT attach it to pool, use @see statfile_pool_open for attaching
* @param pool statfile pool object
* @param filename name of statfile to create
* @param len length of new statfile
* @return 0 if file was created and -1 in case of error
*/
int statfile_pool_create (statfile_pool_t *pool, char *filename, size_t len);
/**
* Close specified statfile
* @param pool statfile pool object
* @param filename name of statfile to close
* @param remove_hash remove filename from opened files hash also
* @return 0 if file was closed and -1 if statfile was not opened
*/
int statfile_pool_close (statfile_pool_t *pool, char *filename, gboolean remove_hash);
/**
* Delete statfile pool and close all attached statfiles
* @param pool statfile pool object
*/
void statfile_pool_delete (statfile_pool_t *pool);
/**
* Lock specified file for exclusive use (eg. learning)
* @param pool statfile pool object
* @param filename name of statfile
*/
void statfile_pool_lock_file (statfile_pool_t *pool, char *filename);
/**
* Unlock specified file
* @param pool statfile pool object
* @param filename name of statfile
*/
void statfile_pool_unlock_file (statfile_pool_t *pool, char *filename);
/**
* Get block from statfile with h1 and h2 values, use time argument for current time
* @param pool statfile pool object
* @param filename name of statfile
* @param h1 h1 in file
* @param h2 h2 in file
* @param now current time
* @return block value or 0 if block is not found
*/
float statfile_pool_get_block (statfile_pool_t *pool, char *filename, uint32_t h1, uint32_t h2, time_t now);
/**
* Set specified block in statfile
* @param pool statfile pool object
* @param filename name of statfile
* @param h1 h1 in file
* @param h2 h2 in file
* @param now current time
* @param value value of block
*/
void statfile_pool_set_block (statfile_pool_t *pool, char *filename, uint32_t h1, uint32_t h2, time_t now, float value);
/**
* Check whether statfile is opened
* @param pool statfile pool object
* @param filename name of statfile
* @return TRUE if specified statfile is opened and FALSE otherwise
*/
gboolean statfile_pool_is_open (statfile_pool_t *pool, char *filename);
#endif
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