容器化的无污染DNS服务
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#include <time.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <sys/time.h>
#include "logger.h"
int LOG_LEVEL = LOG_INFO; // default log level
static const char *log_string[] = {
"[DEBUG]",
"[INFO]",
"[WARN]",
"[ERROR]",
"[FATAL]",
};
static const char *log_color[] = {
"\x1b[39m", // debug
"\x1b[32m", // info
"\x1b[33m", // warn
"\x1b[31m", // error
"\x1b[95m", // fatal
};
void fprint_prefix() { // print log prefix and time info
time_t _time;
time(&_time);
struct timeval tv;
gettimeofday(&tv, NULL);
struct tm *t = localtime(&_time);
fprintf(stderr, "\x1b[36m[%s]\x1b[0m", LOG_PREFIX);
fprintf(stderr, " \x1b[90m%04d-%02d-%02d", t->tm_year + 1900, t->tm_mon + 1, t->tm_mday);
fprintf(stderr, " %02d:%02d:%02d.%03ld\x1b[0m", t->tm_hour, t->tm_min, t->tm_sec, tv.tv_usec / 1000);
}
void log_printf(int level, const char *fmt, ...) {
if (level < LOG_LEVEL) { // skip low log level
return;
}
va_list ap;
va_start(ap, fmt);
fprint_prefix();
fprintf(stderr, " %s%s\x1b[0m ", log_color[level], log_string[level]); // show log level
vfprintf(stderr, fmt, ap); // output log content
fprintf(stderr, "\n"); // add LF after line
fflush(stderr);
va_end(ap);
if (level == LOG_FATAL) {
exit(1);
}
}
void log_perror(const char *fmt, ...) {
va_list ap;
va_start(ap, fmt);
fprint_prefix();
fprintf(stderr, " %s%s\x1b[0m ", log_color[LOG_ERROR], log_string[LOG_ERROR]);
vfprintf(stderr, fmt, ap); // output log content
fflush(stderr);
perror("");
}