cursesLogBrowser.C

//
//   $Id: cursesLogBrowser.C,v 1.2 2008/02/27 19:12:21 fine Exp $
//
//  Based on critServer.C written by Tonko Ljubicic
//  Curses functionality and command line args added by M.J. LeVine 01/2003
//

#include <stdio.h>
#include <errno.h>
#include <unistd.h>
#include <strings.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <curses.h>

#define MAX_LOGFILES 128


//#define DEBUG
static char buff[1024] ;
static struct stat statb ;

static char level_str[] = "dummy string";

static char logfiles[MAX_LOGFILES][128] = {
        "/RTS/log/rts.log",
        "/RTS/log/trigger.log",
        "/RTS/log/evp.log",
        "/RTS/log/det.log",
} ;

static FILE *files[MAX_LOGFILES] ;

static int oldsizes[MAX_LOGFILES] ;

// we define the colors here
// put near top of file for visibility
void define_colors(){
  // palette:
  // COLOR_BLACK 
  // COLOR_RED 
  // COLOR_GREEN 
  // COLOR_YELLOW 
  // COLOR_BLUE 
  // COLOR_MAGENTA 
  // COLOR_CYAN 
  // COLOR_WHITE

  // init_pair(refno,foreground color, background color)
  init_pair(1,COLOR_BLACK,COLOR_WHITE);      // used for DEBUG & NOTICE
  init_pair(2,COLOR_CYAN,COLOR_WHITE);       // used for WARNING
  init_pair(3,COLOR_MAGENTA,COLOR_WHITE);    // used for ERROR
  init_pair(4,COLOR_MAGENTA,COLOR_YELLOW);    // used for OPERATOR
  init_pair(5,COLOR_RED,COLOR_BLACK);        // used for CRITICAL & TERR

  attron(COLOR_PAIR(1));
  bkgd(' ');
}

int main(int argc, char *argv[])
{
        char *fret ;
        int ret ;
        int i,j, level ;
        int data_in ;

        for (i=2; i<=argc; i++) {
          if (strncmp(argv[i-1],"-h",2)==0) {
            initscr();
            printw("usage: logBrowser [-n ALARM_LEVEL] [file1 [,file2....]]\n\n\
 ALARM_LEVEL={DEBug,NOTice,WARNing,ERRor,OPERator,CRITical,TERR}\n\
 specifies the lowest level to be printed.\n\
 Values of ALARM_LEVEL are not case sensitive.\n\
 Values may be abbreviated as indicated in upper case.\n\
 If no alarm level specified all messages will be displayed.\n\n\
 Log files specified by  filename[s] will be displayed.\n\
 If none are specified, all log files will be shown.\n");
            getch();  //wait for keyboard input - avoids window disappearing
            exit(0);
          }
        }
        for (j=0,i=2; i<=argc; i++) {
          if (strncasecmp(argv[i-1],"-n",2)==0) {
            strcpy(level_str,argv[i++]);
            if (strncasecmp(level_str,"DEB",3)==0) level = 0;
            else if (strncasecmp(level_str,"NOT",3)==0) level = 1;
            else if (strncasecmp(level_str,"WARN",4)==0) level = 2;
            else if (strncasecmp(level_str,"ERR",3)==0) level = 3;
            else if (strncasecmp(level_str,"OPER",4)==0) level = 4;
            else if (strncasecmp(level_str,"CRIT",4)==0) level = 5;
            else if (strncasecmp(level_str,"TERR",4)==0) level = 5;
            else level = 0;
          }
          else {
            strcpy(logfiles[j++],argv[i-1]);
          }
        }

#ifdef DEBUG
        if (j>0) logfiles[j][0] = 0;

        printf("level=%d\n",level);
        j = 0;
        while (logfiles[j][0] != 0) {
          printf("filename[%d]: %s\n",j,logfiles[j++]);
          } 
        printf("\n");
#endif
//==================finished parsing command line =================

        i = 0;
        while(logfiles[i][0] != 0) {
                
                files[i] = fopen(logfiles[i],"r") ;

                if(files[i] == NULL) {
                        perror(logfiles[i]) ;
                }
                i++ ;
        } ;


        initscr();

        if(has_colors() == FALSE) {
          endwin();
          printf("This terminal does not support color: \n\
use /usr/dt/bin/dtterm -background white\n");
          exit(1);
        }

        scrollok(stdscr,TRUE);
        start_color();
        define_colors();
        intrflush(stdscr,TRUE); // flush output after keyboard interrupt
       
        for(;;) {

          int inlevel;

          data_in = 0 ;
          for(i=0;i<MAX_LOGFILES;i++) {

            if(logfiles[i][0]==0) continue ;
            
            errno = 0 ;
            fret = fgets(buff,sizeof(buff),files[i]) ;
            if(fret == NULL) {
              if(errno) {
                perror(logfiles[i]) ;
                sleep(1) ;
                continue ;
              }
              // let's check the file
              ret = stat(logfiles[i],&statb) ;
              if(ret < 0) {
                perror(logfiles[i]) ;
                sleep(1) ;
                continue ;
              }
              
              if(statb.st_size < oldsizes[i]) {
                fclose(files[i]) ;
                files[i] = fopen(logfiles[i],"r") ;
                oldsizes[i] = 0 ;
                continue ;
                                // reopen
              }
              oldsizes[i] = statb.st_size ;
              continue ;        // no data...
            }
            
            data_in++ ; // we have something
            
            inlevel = 0;
            if(strstr(buff,": DEBUG:") != NULL) inlevel=0;
            else if(strstr(buff,": NOTICE:") != NULL) inlevel = 1;
            else if(strstr(buff,": WARNING:") != NULL) inlevel = 2;
            else if(strstr(buff,": ERROR:") != NULL) inlevel = 3;
            else if(strstr(buff,": OPERATOR:") != NULL) inlevel = 4;
            else if(strstr(buff,": TERR:") != NULL) inlevel = 5;
            else if(strstr(buff,": CRITICAL:") != NULL) inlevel = 5;
            
            if (inlevel<level) continue;

            switch (inlevel) {
            case 0:
              attron(COLOR_PAIR(1));
              break;
            case 1:
              attron(COLOR_PAIR(1));
              break;
            case 2:
              attron(COLOR_PAIR(2));
              break;
            case 3:
              attron(COLOR_PAIR(3));
              attron(A_BOLD);
              break;
            case 4:
              attron(COLOR_PAIR(4));
              attron(A_BOLD);
              break;
            case 5:
              attron(COLOR_PAIR(5));
              attron(A_BOLD);
              break;
            default:
              break;
            }
            
            printw("%s",buff) ;    // write the line
            attron(COLOR_PAIR(1)); // back to black on white
            attroff(A_BOLD);       // turn off the bold
            refresh();             // paint the screen
          }

          if(!data_in) sleep(1) ;
          
        }       // FOREVER

        endwin();
        return -1 ;     // UNREACHABLE
}