/*
  Copyright (c) 2008-2012 Red Hat, Inc. <http://www.redhat.com>
  This file is part of GlusterFS.

  This file is licensed to you under your choice of the GNU Lesser
  General Public License, version 3 or any later version (LGPLv3 or
  later), or the GNU General Public License, version 2 (GPLv2), in all
  cases as published by the Free Software Foundation.
*/

#ifndef __LOGGING_H__
#define __LOGGING_H__

#include <sys/time.h>
#include <stdint.h>
#include <stdio.h>
#include <stdarg.h>
#include <pthread.h>
#include "glusterfs/list.h"

#ifdef GF_DARWIN_HOST_OS
#define GF_PRI_FSBLK "u"
#define GF_PRI_DEV PRId32
#define GF_PRI_INODE PRIu64
#define GF_PRI_NLINK PRIu32
#define GF_PRI_SECOND "ld"
#define GF_PRI_SUSECONDS "06d"
#define GF_PRI_SNSECONDS "09ld"
#define GF_PRI_USEC "d"
#else
#define GF_PRI_FSBLK PRIu64
#define GF_PRI_DEV PRIu64
#define GF_PRI_INODE PRIu64
#define GF_PRI_NLINK PRIu32
#define GF_PRI_SECOND "lu"
#define GF_PRI_SUSECONDS "06ld"
#define GF_PRI_SNSECONDS "09ld"
#define GF_PRI_USEC "ld"
#endif
#define GF_PRI_BLKSIZE PRId32
#define GF_PRI_SIZET "zu"
#define GF_PRI_ATOMIC PRIu64

#ifdef GF_DARWIN_HOST_OS
#define GF_PRI_TIME "ld"
#else
#define GF_PRI_TIME PRIu64
#endif

#if 0
/* Syslog definitions :-) */
#define LOG_EMERG 0   /* system is unusable */
#define LOG_ALERT 1   /* action must be taken immediately */
#define LOG_CRIT 2    /* critical conditions */
#define LOG_ERR 3     /* error conditions */
#define LOG_WARNING 4 /* warning conditions */
#define LOG_NOTICE 5  /* normal but significant condition */
#define LOG_INFO 6    /* informational */
#define LOG_DEBUG 7   /* debug-level messages */
#endif

#define GF_LOG_FORMAT_NO_MSG_ID "no-msg-id"
#define GF_LOG_FORMAT_WITH_MSG_ID "with-msg-id"

#define GF_LOGGER_GLUSTER_LOG "gluster-log"
#define GF_LOGGER_SYSLOG "syslog"

typedef enum {
    GF_LOG_NONE,
    GF_LOG_EMERG,
    GF_LOG_ALERT,
    GF_LOG_CRITICAL, /* fatal errors */
    GF_LOG_ERROR,    /* major failures (not necessarily fatal) */
    GF_LOG_WARNING,  /* info about normal operation */
    GF_LOG_NOTICE,
    GF_LOG_INFO,  /* Normal information */
    GF_LOG_DEBUG, /* internal errors */
    GF_LOG_TRACE, /* full trace of operation */
} gf_loglevel_t;

/* format for the logs */
typedef enum {
    gf_logformat_traditional = 0, /* Format as in gluster 3.5 */
    gf_logformat_withmsgid, /* Format enhanced with MsgID, ident, errstr */
    gf_logformat_cee        /* log enhanced format in cee */
} gf_log_format_t;

/* log infrastructure to log to */
typedef enum {
    gf_logger_glusterlog = 0, /* locations and files as in gluster 3.5 */
    gf_logger_syslog          /* log to (r)syslog, based on (r)syslog conf */
    /* NOTE: In the future journald, lumberjack, next new thing here */
} gf_log_logger_t;

#define DEFAULT_LOG_FILE_DIRECTORY DATADIR "/log/glusterfs"
#define DEFAULT_QUOTA_CRAWL_LOG_DIRECTORY DATADIR "/log/glusterfs/quota_crawl"
#define DEFAULT_LOG_LEVEL GF_LOG_INFO

typedef struct gf_log_handle_ {
    pthread_mutex_t logfile_mutex;
    gf_loglevel_t loglevel;
    gf_loglevel_t sys_log_level;
    int gf_log_syslog;
    char *filename;
    FILE *logfile;
    FILE *gf_log_logfile;
    char *cmd_log_filename;
    FILE *cmdlogfile;
    gf_log_logger_t logger;
    gf_log_format_t logformat;
    char *ident;
    int log_control_file_found;
    struct list_head lru_queue;
    pthread_mutex_t log_buf_lock;
    struct _gf_timer *log_flush_timer;
    int localtime;
    uint32_t lru_size;
    uint32_t lru_cur_size;
    uint32_t timeout;
    uint8_t logrotate;
    uint8_t cmd_history_logrotate;
} gf_log_handle_t;

typedef struct log_buf_ {
    char *msg;
    uint64_t msg_id;
    int errnum;
    struct timeval oldest;
    struct timeval latest;
    char *domain;
    char *file;
    char *function;
    int32_t line;
    gf_loglevel_t level;
    int refcount;
    int graph_id;
    struct list_head msg_list;
} log_buf_t;

void
gf_log_globals_init(void *ctx, gf_loglevel_t level);
int
gf_log_init(void *data, const char *filename, const char *ident);

void
gf_log_logrotate(int signum);

void
gf_log_cleanup(void);

/* Internal interfaces to log messages with message IDs */
int
_gf_msg(const char *domain, const char *file, const char *function,
        int32_t line, gf_loglevel_t level, int errnum, int trace,
        uint64_t msgid, const char *fmt, ...)
    __attribute__((__format__(__printf__, 9, 10)));

void
_gf_msg_backtrace_nomem(gf_loglevel_t level, int stacksize);

int
_gf_msg_plain(gf_loglevel_t level, const char *fmt, ...)
    __attribute__((__format__(__printf__, 2, 3)));

int
_gf_msg_plain_nomem(gf_loglevel_t level, const char *msg);

int
_gf_msg_vplain(gf_loglevel_t level, const char *fmt, va_list ap);

int
_gf_msg_nomem(const char *domain, const char *file, const char *function,
              int line, gf_loglevel_t level, size_t size);

int
_gf_log(const char *domain, const char *file, const char *function,
        int32_t line, gf_loglevel_t level, const char *fmt, ...)
    __attribute__((__format__(__printf__, 6, 7)));

int
_gf_log_callingfn(const char *domain, const char *file, const char *function,
                  int32_t line, gf_loglevel_t level, const char *fmt, ...)
    __attribute__((__format__(__printf__, 6, 7)));

int
_gf_log_eh(const char *function, const char *fmt, ...)
    __attribute__((__format__(__printf__, 2, 3)));

/* treat GF_LOG_TRACE and GF_LOG_NONE as LOG_DEBUG and
 * other level as is */
#define SET_LOG_PRIO(level, priority)                                          \
    do {                                                                       \
        if (GF_LOG_TRACE == (level) || GF_LOG_NONE == (level)) {               \
            priority = LOG_DEBUG;                                              \
        } else {                                                               \
            priority = (level)-1;                                              \
        }                                                                      \
    } while (0)

/* extract just the file name from the path */
#define GET_FILE_NAME_TO_LOG(file, basename)                                   \
    do {                                                                       \
        basename = strrchr((file), '/');                                       \
        if (basename)                                                          \
            basename++;                                                        \
        else                                                                   \
            basename = (file);                                                 \
    } while (0)

#define PRINT_SIZE_CHECK(ret, label, strsize)                                  \
    do {                                                                       \
        if (ret < 0)                                                           \
            goto label;                                                        \
        if ((strsize - ret) > 0) {                                             \
            strsize -= ret;                                                    \
        } else {                                                               \
            ret = 0;                                                           \
            goto label;                                                        \
        }                                                                      \
    } while (0)

#define FMT_WARN(fmt...)                                                       \
    do {                                                                       \
        if (0)                                                                 \
            printf(fmt);                                                       \
    } while (0)

/* Interface to log messages with message IDs */
#define gf_msg(dom, level, errnum, msgid, fmt...)                              \
    do {                                                                       \
        _gf_msg(dom, __FILE__, __FUNCTION__, __LINE__, level, errnum, 0,       \
                msgid, ##fmt);                                                 \
    } while (0)

/* no frills, no thrills, just a vanilla message, used to print the graph */
#define gf_msg_plain(level, fmt...)                                            \
    do {                                                                       \
        _gf_msg_plain(level, ##fmt);                                           \
    } while (0)

#define gf_msg_plain_nomem(level, msg)                                         \
    do {                                                                       \
        _gf_msg_plain_nomem(level, msg);                                       \
    } while (0)

#define gf_msg_vplain(level, fmt, va)                                          \
    do {                                                                       \
        _gf_msg_vplain(level, fmt, va);                                        \
    } while (0)

#define gf_msg_backtrace_nomem(level, stacksize)                               \
    do {                                                                       \
        _gf_msg_backtrace_nomem(level, stacksize);                             \
    } while (0)

#define gf_msg_callingfn(dom, level, errnum, msgid, fmt...)                    \
    do {                                                                       \
        _gf_msg(dom, __FILE__, __FUNCTION__, __LINE__, level, errnum, 1,       \
                msgid, ##fmt);                                                 \
    } while (0)

/* No malloc or calloc should be called in this function */
#define gf_msg_nomem(dom, level, size)                                         \
    do {                                                                       \
        _gf_msg_nomem(dom, __FILE__, __FUNCTION__, __LINE__, level, size);     \
    } while (0)

/* Debug or trace messages do not need message IDs as these are more developer
 * related. Hence, the following abstractions are provided for the same */
#define gf_msg_debug(dom, errnum, fmt...)                                      \
    do {                                                                       \
        _gf_msg(dom, __FILE__, __FUNCTION__, __LINE__, GF_LOG_DEBUG, errnum,   \
                0, 0, ##fmt);                                                  \
    } while (0)

#define gf_msg_trace(dom, errnum, fmt...)                                      \
    do {                                                                       \
        _gf_msg(dom, __FILE__, __FUNCTION__, __LINE__, GF_LOG_TRACE, errnum,   \
                0, 0, ##fmt);                                                  \
    } while (0)

#define gf_log(dom, level, fmt...)                                             \
    do {                                                                       \
        FMT_WARN(fmt);                                                         \
        _gf_log(dom, __FILE__, __FUNCTION__, __LINE__, level, ##fmt);          \
    } while (0)

#define gf_log_eh(fmt...)                                                      \
    do {                                                                       \
        FMT_WARN(fmt);                                                         \
        _gf_log_eh(__FUNCTION__, ##fmt);                                       \
    } while (0)

#define gf_log_callingfn(dom, level, fmt...)                                   \
    do {                                                                       \
        FMT_WARN(fmt);                                                         \
        _gf_log_callingfn(dom, __FILE__, __FUNCTION__, __LINE__, level,        \
                          ##fmt);                                              \
    } while (0)

/* Log once in GF_UNIVERSAL_ANSWER times */
#define GF_LOG_OCCASIONALLY(var, args...)                                      \
    if (var++ == 0 || !((var - 1) % GF_UNIVERSAL_ANSWER)) {                    \
        gf_log(args);                                                          \
    }

struct _glusterfs_ctx;

void
gf_log_disable_syslog(void);
void
gf_log_enable_syslog(void);
gf_loglevel_t
gf_log_get_loglevel(void);
void
gf_log_set_loglevel(struct _glusterfs_ctx *ctx, gf_loglevel_t level);
int
gf_log_get_localtime(void);
void
gf_log_set_localtime(int);
void
gf_log_flush(void);
gf_loglevel_t
gf_log_get_xl_loglevel(void *xl);
void
gf_log_set_xl_loglevel(void *xl, gf_loglevel_t level);

int
gf_cmd_log(const char *domain, const char *fmt, ...)
    __attribute__((__format__(__printf__, 2, 3)));

int
gf_cmd_log_init(const char *filename);

void
set_sys_log_level(gf_loglevel_t level);

int
gf_log_fini(void *data);

void
gf_log_set_logger(gf_log_logger_t logger);

void
gf_log_set_logformat(gf_log_format_t format);

void
gf_log_set_log_buf_size(uint32_t buf_size);

void
gf_log_set_log_flush_timeout(uint32_t timeout);

void
gf_log_flush_msgs(struct _glusterfs_ctx *ctx);

int
gf_log_inject_timer_event(struct _glusterfs_ctx *ctx);

void
gf_log_disable_suppression_before_exit(struct _glusterfs_ctx *ctx);

#define GF_DEBUG(xl, format, args...)                                          \
    gf_log((xl)->name, GF_LOG_DEBUG, format, ##args)
#define GF_INFO(xl, format, args...)                                           \
    gf_log((xl)->name, GF_LOG_INFO, format, ##args)
#define GF_WARNING(xl, format, args...)                                        \
    gf_log((xl)->name, GF_LOG_WARNING, format, ##args)
#define GF_ERROR(xl, format, args...)                                          \
    gf_log((xl)->name, GF_LOG_ERROR, format, ##args)

int
_gf_smsg(const char *domain, const char *file, const char *function,
         int32_t line, gf_loglevel_t level, int errnum, int trace,
         uint64_t msgid, const char *event, ...);

/* Interface to log messages with message IDs */
#define gf_smsg(dom, level, errnum, msgid, event...)                           \
    do {                                                                       \
        _gf_smsg(dom, __FILE__, __FUNCTION__, __LINE__, level, errnum, 0,      \
                 msgid, msgid##_STR, ##event);                                 \
    } while (0)

#endif /* __LOGGING_H__ */