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#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <time.h>
#include <syslog.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include "log.h"
#include "common.h"
// ----------------------------------------------------------------------------
// LOG
const char *program_name = "";
unsigned long long debug_flags = DEBUG;
int silent = 0;
int access_fd = -1;
FILE *stdaccess = NULL;
int access_log_syslog = 1;
int error_log_syslog = 1;
int output_log_syslog = 1; // debug log
time_t error_log_throttle_period = 1200;
unsigned long error_log_errors_per_period = 200;
int error_log_limit(int reset) {
static time_t start = 0;
static unsigned long counter = 0, prevented = 0;
// do not throttle if the period is 0
if(error_log_throttle_period == 0)
return 0;
// prevent all logs if the errors per period is 0
if(error_log_errors_per_period == 0)
return 1;
time_t now = time(NULL);
if(!start) start = now;
if(reset) {
if(prevented) {
log_date(stderr);
fprintf(stderr, "%s: Resetting logging for process '%s' (prevented %lu logs in the last %ld seconds).\n"
, program_name
, program_name
, prevented
, now - start
);
}
start = now;
counter = 0;
prevented = 0;
}
// detect if we log too much
counter++;
if(now - start > error_log_throttle_period) {
if(prevented) {
log_date(stderr);
fprintf(stderr, "%s: Resuming logging from process '%s' (prevented %lu logs in the last %ld seconds).\n"
, program_name
, program_name
, prevented
, error_log_throttle_period
);
}
// restart the period accounting
start = now;
counter = 1;
prevented = 0;
// log this error
return 0;
}
if(counter > error_log_errors_per_period) {
if(!prevented) {
log_date(stderr);
fprintf(stderr, "%s: Too many logs (%lu logs in %ld seconds, threshold is set to %lu logs in %ld seconds). Preventing more logs from process '%s' for %ld seconds.\n"
, program_name
, counter
, now - start
, error_log_errors_per_period
, error_log_throttle_period
, program_name
, start + error_log_throttle_period - now);
}
prevented++;
// prevent logging this error
return 1;
}
return 0;
}
void log_date(FILE *out)
{
char outstr[200];
time_t t;
struct tm *tmp, tmbuf;
t = time(NULL);
tmp = localtime_r(&t, &tmbuf);
if (tmp == NULL) return;
if (strftime(outstr, sizeof(outstr), "%y-%m-%d %H:%M:%S", tmp) == 0) return;
fprintf(out, "%s: ", outstr);
}
void debug_int( const char *file, const char *function, const unsigned long line, const char *fmt, ... )
{
va_list args;
log_date(stdout);
va_start( args, fmt );
fprintf(stdout, "DEBUG (%04lu@%-10.10s:%-15.15s): %s: ", line, file, function, program_name);
vfprintf( stdout, fmt, args );
va_end( args );
fprintf(stdout, "\n");
if(output_log_syslog) {
va_start( args, fmt );
vsyslog(LOG_ERR, fmt, args );
va_end( args );
}
}
void info_int( const char *file, const char *function, const unsigned long line, const char *fmt, ... )
{
va_list args;
// prevent logging too much
if(error_log_limit(0)) return;
log_date(stderr);
va_start( args, fmt );
if(debug_flags) fprintf(stderr, "INFO (%04lu@%-10.10s:%-15.15s): %s: ", line, file, function, program_name);
else fprintf(stderr, "INFO: %s: ", program_name);
vfprintf( stderr, fmt, args );
va_end( args );
fprintf(stderr, "\n");
if(error_log_syslog) {
va_start( args, fmt );
vsyslog(LOG_INFO, fmt, args );
va_end( args );
}
}
void error_int( const char *prefix, const char *file, const char *function, const unsigned long line, const char *fmt, ... )
{
va_list args;
// prevent logging too much
if(error_log_limit(0)) return;
log_date(stderr);
va_start( args, fmt );
if(debug_flags) fprintf(stderr, "%s (%04lu@%-10.10s:%-15.15s): %s: ", prefix, line, file, function, program_name);
else fprintf(stderr, "%s: %s: ", prefix, program_name);
vfprintf( stderr, fmt, args );
va_end( args );
if(errno) {
char buf[200];
char *s = strerror_r(errno, buf, 200);
fprintf(stderr, " (errno %d, %s)\n", errno, s);
errno = 0;
}
else fprintf(stderr, "\n");
if(error_log_syslog) {
va_start( args, fmt );
vsyslog(LOG_ERR, fmt, args );
va_end( args );
}
}
void fatal_int( const char *file, const char *function, const unsigned long line, const char *fmt, ... )
{
va_list args;
log_date(stderr);
va_start( args, fmt );
if(debug_flags) fprintf(stderr, "FATAL (%04lu@%-10.10s:%-15.15s): %s: ", line, file, function, program_name);
else fprintf(stderr, "FATAL: %s: ", program_name);
vfprintf( stderr, fmt, args );
va_end( args );
perror(" # ");
fprintf(stderr, "\n");
if(error_log_syslog) {
va_start( args, fmt );
vsyslog(LOG_CRIT, fmt, args );
va_end( args );
}
exit(1);
}
void log_access( const char *fmt, ... )
{
va_list args;
if(stdaccess) {
log_date(stdaccess);
va_start( args, fmt );
vfprintf( stdaccess, fmt, args );
va_end( args );
fprintf( stdaccess, "\n");
fflush( stdaccess );
}
if(access_log_syslog) {
va_start( args, fmt );
vsyslog(LOG_INFO, fmt, args );
va_end( args );
}
}
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