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logger.h
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logger.h
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/*
* Copyright (c) 2013, Henrik Gustafsson <gsson@fnord.se>
*
* Permission to use, copy, modify, and/or distribute this
* software for any purpose with or without fee is hereby
* granted, provided that the above copyright notice and this
* permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
* WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
* THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR
* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
* FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
* CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
* SOFTWARE.
*/
#ifndef LOGGER_H_
#define LOGGER_H_
#include <pthread.h>
#define LGR_MAX_MESSAGE 2048
enum logger_framing {
LGR_FRAMING_NL = 0,
LGR_FRAMING_SYSLOG = 1,
LGR_FRAMING_SYSLOG_OC = 2,
LGR_FRAMING_SYSLOG_NL = 3
};
enum logger_protocol {
LGR_UDP,
LGR_TCP,
LGR_UNIX_DGRAM,
LGR_UNIX_STREAM,
LGR_STDOUT,
LGR_STDERR,
LGR_FILE
};
enum logger_severity {
LGR_SEV_EMERG=0,
LGR_SEV_ALERT=1,
LGR_SEV_CRIT=2,
LGR_SEV_ERR=3,
LGR_SEV_WARNING=4,
LGR_SEV_NOTICE=5,
LGR_SEV_INFO=6,
LGR_SEV_DEBUG=7
};
enum logger_facility {
LGR_FAC_KERN=0,
LGR_FAC_USER=1,
LGR_FAC_MAIL=2,
LGR_FAC_DAEMON=3,
LGR_FAC_AUTH=4,
LGR_FAC_SYSLOG=5,
LGR_FAC_LPR=6,
LGR_FAC_NEWS=7,
LGR_FAC_UUCP=8,
LGR_FAC_CRON=9,
LGR_FAC_AUTHPRIV=10,
LGR_FAC_FTP=11,
LGR_FAC_LOCAL0=16,
LGR_FAC_LOCAL1=17,
LGR_FAC_LOCAL2=18,
LGR_FAC_LOCAL3=19,
LGR_FAC_LOCAL4=20,
LGR_FAC_LOCAL5=21,
LGR_FAC_LOCAL6=22,
LGR_FAC_LOCAL7=23
};
struct logger_config {
enum logger_facility facility;
enum logger_severity severity;
enum logger_protocol protocol;
enum logger_framing framing;
char *address;
char *port;
char **fields;
};
struct logger_tl;
struct logger;
/**
* Inline rendering function
*
* @param buf The buffer to render into
* @param maxlen The maximum length of message
* @param arg The value provided to the logger_render() function
*
* @return The length of the message in bytes.
*/
typedef int (* render_fn)(char *buf, int maxlen, void *arg);
typedef int (* write_fn)(struct logger *logger, struct logger_tl *tl, size_t msg_len);
typedef void (* close_fn)(struct logger *logger, int oldFd);
typedef int (* connect_fn)(enum logger_protocol protocol, const char *addr, const char *service);
struct logger {
pthread_t thread;
pthread_key_t tl;
pthread_mutex_t connector_lock;
pthread_cond_t connector_cond;
pthread_cond_t connection_cond;
pthread_mutex_t connection_lock;
int running;
int pri;
int fd;
char meta[64];
struct logger_config config;
connect_fn connect;
write_fn write;
close_fn close;
};
/**
* Open logger
*
* @param logger The logger structure to initialize
* @param config The logger configuration
*/
void logger_open(struct logger *logger, struct logger_config *config);
/**
* Close logger
*
* NOTE: failing to close the logger will leak memory, threads and file descriptors
*
* @param logger The logger to close
*/
void logger_close(struct logger *logger);
/**
* Wait for logger to become connected
*
* @param logger The logger to wait for
*/
void logger_wait(struct logger *logger);
/* Log stuff */
/**
* Send message
*
* @param logger The logger to send to.
* @param msg The message to send.
*/
int logger_log(struct logger *logger, const char *msg);
/**
* Send formatted message
*
* @param logger The logger to send to.
* @param fmt The formatting template (Uses printf() syntax)
* @param ... The formatting arguments
*/
int logger_logf(struct logger *logger, const char *fmt, ...);
/**
* Inline rendering function
*
* Copy data into the send-buffer, potentially bypassing one level of buffer copies.
*
* @param logger The logger to send to.
* @param renderer The rendering function.
* @param arg The argument to pass to the rendering function.
*/
int logger_render(struct logger *logger, render_fn renderer, void *arg);
#endif /* LOGGER_H_ */