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/*
ELAPI
Header file for the ELAPI logging interface.
Copyright (C) Dmitri Pal <dpal@redhat.com> 2009
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 3 of the License, or
(at your option) any later version.
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.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef ELAPI_LOG_H
#define ELAPI_LOG_H
#include <stdint.h>
#include "elapi_async.h"
/* Default values for targets -
* these constants match values in the default configuration.
*/
#define E_TARGET_DEBUG 0x00000001
#define E_TARGET_AUDIT 0x00000002
#define E_TARGET_LOG 0x00000004
/* Opaque dispatcher structure */
struct elapi_dispatcher;
/******************** Low level thread safe interface ************************************/
/* This interface should be used if application plans to control the dispatcher,
* implement its own sinks that can be added dynamically or implements it own routing function.
*/
/********** Main functions of the interface **********/
/* Structure that contains the pointer to functions
* that needed to be provided to enable async processing.
*/
struct elapi_async_ctx;
/* Interface to create the async context */
int elapi_create_asctx(struct elapi_async_ctx **ctx,
elapi_add_fd add_fd_cb,
elapi_rem_fd rem_fd_cb,
elapi_set_fd set_fd_cb,
void *ext_fd_data,
elapi_add_tm add_tm_cb,
elapi_rem_tm rem_tm_cb,
void *ext_tm_data);
/* Function to free the async context */
void elapi_destroy_asctx(struct elapi_async_ctx *ctx);
/* Function to create a dispatcher */
int elapi_create_dispatcher(struct elapi_dispatcher **dispatcher, /* Handle of the dispatcher will be stored in this variable */
const char *appname, /* Application name. Passed to the sinks to do initialization */
const char *config_path); /* See notes below in the elapi_init() function. */
/* A more advanced function to create a dispatcher */
int elapi_create_dispatcher_adv(struct elapi_dispatcher **dispatcher, /* Handle of the dispatcher will be stored in this variable */
const char *appname, /* Application name. Passed to the sinks to do initialization */
const char *config_path, /* See notes below in the elapi_init() function. */
struct elapi_async_ctx *ctx); /* Async context. */
/* Function to clean memory associated with the dispatcher */
void elapi_destroy_dispatcher(struct elapi_dispatcher *dispatcher);
/* Function to log an event */
int elapi_dsp_log(uint32_t target,
struct elapi_dispatcher *dispatcher,
struct collection_item *event);
/* Function to log raw key value pairs without creating an event */
int elapi_dsp_msg(uint32_t target,
struct elapi_dispatcher *dispatcher,
struct collection_item *tpl,
...);
/********** Advanced dispatcher management functions **********/
/* Managing the sink collection */
int elapi_alter_dispatcher(struct elapi_dispatcher *dispatcher, /* Dispatcher */
const char *target, /* Target to look for */
const char *sink, /* Sink to change */
int action); /* Action to perform for sink */
/* Get target list */
char **elapi_get_target_list(struct elapi_dispatcher *dispatcher);
/* Free target list */
void elapi_free_target_list(char **target_list);
/* Get sink list */
char **elapi_get_sink_list(struct elapi_dispatcher *dispatcher, char *target);
/* Free sink list */
void elapi_free_sink_list(char **sink_list);
/******************** High level interface ************************************/
/* This interface is not thread safe but convenient. It hides the dispatcher. */
/* Function to initialize ELAPI library in the single threaded applications */
/* If config_path = NULL the configuration will be read from the standard locations:
* - First from the global configuration file "elapi.conf" located in the directory
* defined at the compile time by the ELAPI_DEFAULT_CONFIG_DIR constant.
* This file is assumed to contain common ELAPI configuration for this host;
* - Second from the file with name constructed from appname by appending to it
* suffix ".conf". The file will be looked in the directory pointed by
* ELAPI_DEFAULT_CONFIG_APP_DIR constant that is defined at compile time.
* The data from second file overwrites and complements the data from the first
* one.
* It is expected that applications will take advantage of the common
* central convention so config_path should be NULL in most cases.
*
* If config_path points to a file the function will try to read the file
* as if it is a configuration file. The appname is ignored in this case.
* If config_path points to a directory, the function will try to read
* configuration from the file with name constructed by appending suffix ".conf"
* to appname. The file will be looked up in that directory.
* If the config_path is neither file or directory the default values will be used
* to initialize dispatcher.
*
* In case appname is NULL a default value defined by build time constant
* ELAPI_DEFAULT_APP_NAME will be used.
*/
int elapi_init(const char *appname, const char *config_path);
/* Log key value pairs */
int elapi_msg(uint32_t target,
struct collection_item *tpl, ...);
/* Log event */
int elapi_log(uint32_t target,
struct collection_item *event);
/* Corresponding wrapping macroses */
#define ELAPI_EVT_DEBUG(event) elapi_log(E_TARGET_DEBUG, event)
#define ELAPI_EVT_LOG(event) elapi_log(E_TARGET_LOG, event)
#define ELAPI_EVT_AUDIT(event) elapi_log(E_TARGET_AUDIT, event)
/* Get dispatcher if you want to do some advanced operations */
struct elapi_dispatcher *elapi_get_dispatcher(void);
/* Close audit */
void elapi_close(void);
#endif
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