/*********************************************************************************
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* Copyright: (C) 2012 Guo Wenxue <guowenxue@gmail.com>
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* All rights reserved.
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*
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* Filename: logger.c
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* Description: This file is the linux infrastructural logger system library
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*
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* Version: 1.0.0(08/08/2012~)
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* Author: Guo Wenxue <guowenxue@gmail.com>
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* ChangeLog: 1, Release initial version on "08/08/2012 04:24:01 PM"
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*
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********************************************************************************/
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#include "logger.h"
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#define PRECISE_TIME_FACTOR 1000
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static unsigned long log_rollback_size = LOG_ROLLBACK_NONE;
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/* This library is not thread safe */
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static logger_t *logger = NULL;
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char *log_str[LOG_LEVEL_MAX + 1] = { "", "F", "E", "W", "N", "D", "I", "T", "M" };
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#define LOG_TIME_FMT "%Y-%m-%d %H:%M:%S"
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static void log_signal_handler(int sig)
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{
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if(!logger)
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return ;
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if (sig == SIGHUP)
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{
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signal(SIGHUP, log_signal_handler);
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log_fatal("SIGHUP received - reopenning log file [%s]", logger->file);
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logger_reopen();
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}
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}
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static void logger_banner(char *prefix)
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{
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if(!logger)
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return ;
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fprintf(logger->fp, "%s log \"%s\" on level [%s] size [%lu] KiB, log system version %s\n",
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prefix, logger->file, log_str[logger->level], log_rollback_size / 1024, LOG_VERSION_STR);
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#ifdef LOG_FILE_LINE
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fprintf(logger->fp, " [ Date ] [ Time ] [ Level ] [ File/Line ] [ Message ]\n");
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#else
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fprintf(logger->fp, " [ Date ] [ Time ] [ Level ] [ Message ]\n");
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#endif
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fprintf(logger->fp, "-------------------------------------------------------------\n");
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}
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static void check_and_rollback(void)
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{
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if(!logger)
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return ;
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if (log_rollback_size != LOG_ROLLBACK_NONE)
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{
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long _curOffset = ftell(logger->fp);
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if ((_curOffset != -1) && (_curOffset >= log_rollback_size))
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{
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char cmd[512];
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snprintf(cmd, sizeof(cmd), "cp -f %s %s.roll", logger->file, logger->file);
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system(cmd);
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if (-1 == fseek(logger->fp, 0L, SEEK_SET))
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fprintf(logger->fp, "log rollback fseek failed \n");
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rewind(logger->fp);
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truncate(logger->file, 0);
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logger_banner("Already rollback");
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}
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}
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}
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/* log_size unit is KB */
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int logger_init(logger_t *log, char *log_file, int level, int log_size)
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{
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if( !log )
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{
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printf("ERROR: Invalid input arguments\n");
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return -1;
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}
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if( log_file )
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{
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strncpy(log->file, log_file, FILENAME_LEN);
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log->flag |= FLAG_LOGGER_FILE;
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}
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else
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{
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strncpy(log->file, DBG_LOG_FILE, FILENAME_LEN);
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log->flag |= FLAG_LOGGER_CONSOLE;
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}
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log->level = level;
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log->size = log_size;
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/* set static global $logger point to argument $log */
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logger = log;
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return 0;
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}
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int logger_open(void)
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{
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struct sigaction act;
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char *filemode;
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if(!logger)
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{
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return -1;
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}
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log_rollback_size = logger->size <= 0 ? LOG_ROLLBACK_NONE : logger->size*1024; /* Unit KiB */
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if ('\0' == logger->file)
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return -1;
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if (!strcmp(logger->file, DBG_LOG_FILE))
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{
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logger->fp = stderr;
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log_rollback_size = LOG_ROLLBACK_NONE;
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logger->flag |= FLAG_LOGGER_CONSOLE;
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goto OUT;
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}
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filemode = (log_rollback_size==LOG_ROLLBACK_NONE) ? "a+" : "w+";
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logger->fp = fopen(logger->file, filemode);
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if (NULL == logger->fp)
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{
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fprintf(stderr, "Open log file \"%s\" in %s failure: %s\n", logger->file, filemode, strerror(errno));
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return -2;
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}
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act.sa_handler = log_signal_handler;
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sigemptyset(&act.sa_mask);
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act.sa_flags = 0;
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sigaction(SIGHUP, &act, NULL);
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OUT:
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logger_banner("Initialize");
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return 0;
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}
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void logger_close(void)
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{
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if (!logger || !logger->fp )
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return;
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logger_banner("\nTerminate");
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logger_raw("\n\n\n\n");
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fflush(logger->fp);
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fclose(logger->fp);
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logger->fp = NULL;
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return ;
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}
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int logger_reopen(void)
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{
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int rc = 0;
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char *filemode;
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if( !logger )
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return -1;
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log_rollback_size = logger->size <= 0 ? LOG_ROLLBACK_NONE : logger->size*1024; /* Unit KiB */
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if (logger->flag & FLAG_LOGGER_CONSOLE )
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{
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fflush(logger->fp);
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logger->fp = stderr;
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return 0;
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}
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if (logger->fp)
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{
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logger_close();
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filemode = log_rollback_size==LOG_ROLLBACK_NONE ? "a+" : "w+";
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logger->fp = fopen(logger->file, filemode);
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if (logger->fp == NULL)
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rc = -2;
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}
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else
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{
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rc = -3;
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}
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if (!rc)
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{
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logger_banner("\nReopen");
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}
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return rc;
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}
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void logger_term(void)
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{
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if(!logger)
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return ;
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logger_close();
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logger = NULL;
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}
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void logger_raw(const char *fmt, ...)
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{
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va_list argp;
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if (!logger || !logger->fp)
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return;
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check_and_rollback();
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va_start(argp, fmt);
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vfprintf(logger->fp, fmt, argp);
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va_end(argp);
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}
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static void cp_printout(char *level, char *fmt, va_list argp)
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{
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char buf[MAX_LOG_MESSAGE_LEN];
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struct tm *local;
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struct timeval now;
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char timestr[256];
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if(!logger)
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return ;
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check_and_rollback();
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gettimeofday(&now, NULL);
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local = localtime(&now.tv_sec);
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strftime(timestr, 256, LOG_TIME_FMT, local);
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vsnprintf(buf, MAX_LOG_MESSAGE_LEN, fmt, argp);
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#ifdef DUMPLICATE_OUTPUT
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printf("%s.%03ld [%s] : %s",
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timestr, now.tv_usec / PRECISE_TIME_FACTOR, level, buf);
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#endif
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if (logger->fp)
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fprintf(logger->fp, "%s.%03ld [%s] : %s", timestr, now.tv_usec / PRECISE_TIME_FACTOR, level, buf);
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if (logger->fp)
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fflush(logger->fp);
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}
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static void cp_printout_line(char *level, char *fmt, char *file, int line, va_list argp)
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{
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char buf[MAX_LOG_MESSAGE_LEN];
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struct tm *local;
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struct timeval now;
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char timestr[256];
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if(!logger)
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return ;
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check_and_rollback();
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gettimeofday(&now, NULL);
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local = localtime(&now.tv_sec);
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strftime(timestr, 256, LOG_TIME_FMT, local);
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vsnprintf(buf, MAX_LOG_MESSAGE_LEN, fmt, argp);
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#ifdef DUMPLICATE_OUTPUT
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printf("[%s.%03ld] <%s> <%s:%04d> : %s",
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timestr, now.tv_usec / PRECISE_TIME_FACTOR, level, file, line, buf);
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#endif
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if (logger->fp)
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{
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fprintf(logger->fp, "[%s.%03ld] <%s> <%s:%04d> : %s",
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timestr, now.tv_usec / PRECISE_TIME_FACTOR, level, file, line, buf);
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fflush(logger->fp);
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}
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}
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void logger_str(int level, const char *msg)
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{
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if (!logger || level>logger->level)
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return;
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check_and_rollback();
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if (logger->fp)
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fwrite(msg, 1, strlen(msg), logger->fp);
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if(logger->fp)
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fflush(logger->fp);
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}
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void logger_min(int level, char *fmt, ...)
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{
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va_list argp;
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if (!logger || level>logger->level)
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return;
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va_start(argp, fmt);
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cp_printout(log_str[level], fmt, argp);
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va_end(argp);
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}
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void logger_line(int level, char *file, int line, char *fmt, ...)
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{
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va_list argp;
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if (!logger || level>logger->level)
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return;
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va_start(argp, fmt);
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cp_printout_line(log_str[level], fmt, file, line, argp);
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va_end(argp);
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}
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#define LINELEN 81
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#define CHARS_PER_LINE 16
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static char *print_char =
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" "
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" "
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" !\"#$%&'()*+,-./"
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"0123456789:;<=>?"
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"@ABCDEFGHIJKLMNO"
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"PQRSTUVWXYZ[\\]^_"
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"`abcdefghijklmno"
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"pqrstuvwxyz{|}~ "
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" "
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" "
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" ???????????????"
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"????????????????"
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"????????????????"
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"????????????????"
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"????????????????"
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"????????????????";
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void logger_dump(int level, char *buf, int len)
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{
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int rc;
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int idx;
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char prn[LINELEN];
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char lit[CHARS_PER_LINE + 2];
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char hc[4];
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short line_done = 1;
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if (!logger || level>logger->level)
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return;
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rc = len;
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idx = 0;
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lit[CHARS_PER_LINE] = '\0';
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while (rc > 0)
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{
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if (line_done)
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snprintf(prn, LINELEN, "%08X: ", idx);
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do
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{
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unsigned char c = buf[idx];
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snprintf(hc, 4, "%02X ", c);
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strncat(prn, hc, LINELEN);
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lit[idx % CHARS_PER_LINE] = print_char[c];
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}
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while (--rc > 0 && (++idx % CHARS_PER_LINE != 0));
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line_done = (idx % CHARS_PER_LINE) == 0;
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if (line_done)
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{
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#ifdef DUMPLICATE_OUTPUT
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printf("%s %s\n", prn, lit);
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#endif
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if (logger->fp)
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fprintf(logger->fp, "%s %s\n", prn, lit);
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}
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}
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if (!line_done)
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{
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int ldx = idx % CHARS_PER_LINE;
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lit[ldx++] = print_char[(int)buf[idx]];
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lit[ldx] = '\0';
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while ((++idx % CHARS_PER_LINE) != 0)
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strncat(prn, " ", LINELEN);
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#ifdef DUMPLICATE_OUTPUT
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printf("%s %s\n", prn, lit);
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#endif
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if (logger->fp)
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fprintf(logger->fp, "%s %s\n", prn, lit);
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}
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}
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