/*
 * This file is part of the PCEPlib, a PCEP protocol library.
 *
 * Copyright (C) 2020 Volta Networks https://voltanet.io/
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser 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 <https://www.gnu.org/licenses/>.
 *
 * Author : Brady Johnson <brady@voltanet.io>
 *
 */


#ifndef PCEP_UTILS_INCLUDE_PCEP_UTILS_LOGGING_H_
#define PCEP_UTILS_INCLUDE_PCEP_UTILS_LOGGING_H_

#include <syslog.h> /* Logging levels */
#include <stdarg.h> /* va_list */
#include <stdint.h> /* uint8_t */

/*
 * The logging defined here i intended to provide the infrastructure to
 * be able to plug-in an external logger, primarily the FRR logger. There
 * will be a default internal logger implemented that will write to stdout,
 * but any other advanced logging features should be implemented externally.
 */

/* Only the following logging levels from syslog.h should be used:
 *
 *   LOG_DEBUG    - For all messages that are enabled by optional debugging
 *                  features, typically preceded by "if (IS...DEBUG...)"
 *   LOG_INFO     - Information that may be of interest, but
 *                  everything seems to be working properly.
 *   LOG_NOTICE   - Only for message pertaining to daemon startup or shutdown.
 *   LOG_WARNING  - Warning conditions: unexpected events, but the daemon
 *                  believes it can continue to operate correctly.
 *   LOG_ERR      - Error situations indicating malfunctions.
 *                  Probably requires attention.
 */


/* The signature of this logger function is the same as the FRR logger */
typedef int (*pcep_logger_func)(int, const char *, va_list);
void register_logger(pcep_logger_func logger);

/* These functions only take affect when using the internal stdout logger */
void set_logging_level(int level);
int get_logging_level(void);

/* Log messages either to a previously registered
 * logger or to the internal default stdout logger. */
void pcep_log(int priority, const char *format, ...);
void pcep_log_hexbytes(int priority, const char *message, const uint8_t *bytes,
		       uint8_t bytes_len);

#endif /* PCEP_UTILS_INCLUDE_PCEP_UTILS_LOGGING_H_ */