Eucalyptus分析二 log

log是系统不可缺少的部分，对查找系统的问题，记录系统运行状况非常有用。Eucalyptus的log部分还比较简单，只是简单记录了特殊事件

log的级别：

enum {EUCADEBUG2, EUCADEBUG, EUCAINFO, EUCAWARN, EUCAERROR, EUCAFATAL};

记当log文件的全局变量

FILE *LOGFH=NULL; //文件指针
char logFile[1024]; //文件名

 

 

下面就是记录log的函数，总的来说就是写入文件或命令行输出，可直接看懂

 

int logfile(char *file, int in_loglevel) {
  logging = 0;
  if (in_loglevel >= EUCADEBUG2 && in_loglevel <= EUCAFATAL) {
    loglevel = in_loglevel;
  } else {
    loglevel = EUCADEBUG;
  }
  if (file == NULL) {
    LOGFH = NULL;
  } else {
    if (LOGFH != NULL) {
      fclose(LOGFH);
    }
   
    snprintf(logFile, 1024, "%s", file);
    LOGFH = fopen(file, "a");
    if (LOGFH) {
      logging=1;
    }
  }
  return(1-logging);
}

void eventlog(char *hostTag, char *userTag, char *cid, char *eventTag, char *other) {
  double ts;
  struct timeval tv;
  char hostTagFull[256];
  char hostName [256];
  FILE *PH;

  if (!timelog) return;

  hostTagFull[0] = '/0';
  PH = popen("hostname", "r");
  fscanf(PH, "%256s", hostName);
  pclose(PH);
  snprintf (hostTagFull, 256, "%s/%s", hostName, hostTag);
 
  gettimeofday(&tv, NULL);
  ts = (double)tv.tv_sec + ((double)tv.tv_usec / 1000000.0);

  logprintf("TIMELOG %s:%s:%s:%s:%f:%s/n", hostTagFull, userTag, cid, eventTag, ts, other);
}

int logprintf(const char *format, ...) {
  va_list ap;
  int rc;
  char buf[27], *eol;
  time_t t;
  FILE *file;
 
  rc = 1;
  va_start(ap, format);
 
  if (logging) {
    file = LOGFH;
  } else {
    file = stdout;
  }
 
  t = time(NULL);
  if (ctime_r(&t, buf)) {
    eol = strchr(buf, '/n');
    if (eol) {
      *eol = '/0';
    }
    fprintf(file, "[%s] ", buf);
  }
  rc = vfprintf(file, format, ap);
  fflush(file);
 
  va_end(ap);
  return(rc);
}

int logprintfl(int level, const char *format, ...) {
  va_list ap;
  int rc, fd;
  char buf[27], *eol;
  time_t t;
  struct stat statbuf;
  FILE *file;
 
  if (level < loglevel) {
    return(0);
  }
 
  rc = 1;
  va_start(ap, format);
 
  if (logging) {
    file = LOGFH;
    fd = fileno(file);
    if (fd > 0) {
      rc = fstat(fd, &statbuf);
      if (!rc && ((int)statbuf.st_size > MAXLOGFILESIZE)) {
 int i;
 char oldFile[1024], newFile[1024];
 
 rc = stat(logFile, &statbuf);
 if (!rc && ((int)statbuf.st_size > MAXLOGFILESIZE)) {
   for (i=4; i>=0; i--) {
     snprintf(oldFile, 1024, "%s.%d", logFile, i);
     snprintf(newFile, 1024, "%s.%d", logFile, i+1);
     rename(oldFile, newFile);
   }
   snprintf(oldFile, 1024, "%s", logFile);
   snprintf(newFile, 1024, "%s.%d", logFile, 0);
   rename(oldFile, newFile);
 }
 fclose(LOGFH);
 LOGFH = fopen(logFile, "a");
 if (LOGFH) {
   file = LOGFH;
 } else {
   file = stdout;
 }
      }
    }
  } else {
    file = stdout;
  }

 
  t = time(NULL);
  if (ctime_r(&t, buf)) {
    eol = strchr(buf, '/n');
    if (eol) {
      *eol = '/0';
    }
    fprintf(file, "[%s]", buf);
  }

  fprintf(file, "[%06d]", getpid());
  if (level == EUCADEBUG2) {fprintf(file, "[%-10s] ", "EUCADEBUG2");}
  else if (level == EUCADEBUG) {fprintf(file, "[%-10s] ", "EUCADEBUG");}
  else if (level == EUCAINFO) {fprintf(file, "[%-10s] ", "EUCAINFO");}
  else if (level == EUCAWARN) {fprintf(file, "[%-10s] ", "EUCAWARN");}
  else if (level == EUCAERROR) {fprintf(file, "[%-10s] ", "EUCAERROR");}
  else if (level == EUCAFATAL) {fprintf(file, "[%-10s] ", "EUCAFATAL");}
  else {fprintf(file, "[%-10s] ", "EUCADEBUG");}
  rc = vfprintf(file, format, ap);
  fflush(file);
 
  va_end(ap);
  return(rc);
}