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// Copyright 2024 Staysail Systems, Inc. <info@staysail.tech>
//
// This software is supplied under the terms of the MIT License, a
// copy of which should be located in the distribution where this
// file was obtained (LICENSE.txt). A copy of the license may also be
// found online at https://opensource.org/licenses/MIT.
//
#include "nng/nng.h"
#include "nng_impl.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#ifdef NNG_PLATFORM_WINDOWS
#include <io.h>
#endif
#ifdef NNG_PLATFORM_POSIX
#include <syslog.h>
#include <unistd.h>
#endif
#include <time.h>
static nng_log_level log_level = NNG_LOG_NOTICE;
static nng_log_facility log_facility = NNG_LOG_USER;
static nng_logger log_logger = nng_null_logger;
void
nng_log_set_facility(nng_log_facility facility)
{
log_facility = facility;
}
void
nng_log_set_level(nng_log_level level)
{
log_level = level;
}
nng_log_level
nng_log_get_level(void)
{
return (log_level);
}
void
nng_log_set_logger(nng_logger logger)
{
if (logger == NULL) {
logger = nng_null_logger;
}
log_logger = logger;
}
void
nng_null_logger(nng_log_level level, nng_log_facility facility,
const char *msgid, const char *msg)
{
NNI_ARG_UNUSED(level);
NNI_ARG_UNUSED(facility);
NNI_ARG_UNUSED(msgid);
NNI_ARG_UNUSED(msg);
}
void
stderr_logger(nng_log_level level, nng_log_facility facility,
const char *msgid, const char *msg, bool timechk)
{
const char *sgr, *sgr0;
// Initial implementation.
bool colors = false;
const char *level_str;
char when[64];
struct tm *tm;
static struct tm last_log = { 0 };
time_t now;
uint64_t sec;
uint32_t nsec;
NNI_ARG_UNUSED(facility);
if (nni_time_get(&sec, &nsec) != 0) {
// default to the epoch if we can't get a clock for some reason
sec = 0;
nsec = 0;
}
now = (time_t) sec;
#ifdef NNG_PLATFORM_WINDOWS
// NB: We are blithely assuming the user has a modern console.
colors = _isatty(_fileno(stderr));
#elif defined(NNG_PLATFORM_POSIX)
// Only assuming we can use colors (and attributes) if stderr is a tty
// and $TERM is reasonable. We assume the terminal supports ECMA-48,
// which is true on every reasonable system these days.
colors = isatty(fileno(stderr)) && (getenv("TERM") != NULL) &&
(getenv("TERM")[0] != 0);
#else
colors = false;
#endif
// Escape hatch to prevent colorizing logs if we have to. Users on
// legacy Windows can set this, or on ancient HP terminals or
// something. Also in the same way that no-color.org proposes.
// The reason for both is to allow suppression *only* for NNG. There
// is no good reason to enable it to override the presence of NO_COLOR.
if ((getenv("NNG_LOG_NO_COLOR") != NULL) ||
(getenv("NO_COLOR") != NULL)) {
colors = false;
}
#ifdef NNG_HAVE_LOCALTIME_R
struct tm tm_buf;
// No timezone offset, not strictly ISO8601 compliant
tm = localtime_r(&now, &tm_buf);
#else
tm = localtime(&now);
#endif
switch (level) {
case NNG_LOG_ERR:
sgr = "\x1b[31m"; // red
sgr0 = "\x1b[0m";
level_str = "ERROR";
break;
case NNG_LOG_WARN:
sgr = "\x1b[33m"; // yellow
sgr0 = "\x1b[0m";
level_str = "WARN";
break;
case NNG_LOG_NOTICE:
sgr = "\x1b[1m"; // bold
sgr0 = "\x1b[0m";
level_str = "NOTICE";
break;
case NNG_LOG_DEBUG:
sgr = "\x1b[36m"; // cyan
sgr0 = "\x1b[0m";
level_str = "DEBUG";
break;
case NNG_LOG_INFO:
sgr = "";
sgr0 = "";
level_str = "INFO";
break;
default:
sgr = "";
sgr0 = "";
level_str = "NONE";
break;
}
if (!colors) {
sgr = "";
sgr0 = "";
}
if (timechk &&
((last_log.tm_mday != tm->tm_mday) ||
(last_log.tm_mon != tm->tm_mon) ||
(last_log.tm_year != tm->tm_year))) {
char new_day[64];
strftime(new_day, sizeof(new_day),
"Date changed to %Y-%m-%d, TZ is %z", tm);
stderr_logger(
NNG_LOG_DEBUG, facility, "NNG-DATE", new_day, false);
last_log = *tm;
}
strftime(when, sizeof(when), "%H:%M:%S", tm);
// we print with millisecond resolution
bool trailing_nl =
((strlen(msg) != 0) && msg[strlen(msg) - 1] == '\n');
(void) fprintf(stderr, "%s[%-6s]: %s.%03d: %s%s%s%s%s", sgr, level_str,
when, nsec / 1000000, msgid ? msgid : "", msgid ? ": " : "", msg,
sgr0, trailing_nl ? "" : "\n");
}
void
nng_stderr_logger(nng_log_level level, nng_log_facility facility,
const char *msgid, const char *msg)
{
stderr_logger(level, facility, msgid, msg, true);
}
void
nng_system_logger(nng_log_level level, nng_log_facility facility,
const char *msgid, const char *msg)
{
#ifdef NNG_PLATFORM_POSIX
int pri;
switch (level) {
case NNG_LOG_ERR:
pri = LOG_ERR;
break;
case NNG_LOG_WARN:
pri = LOG_WARNING;
break;
case NNG_LOG_NOTICE:
pri = LOG_NOTICE;
break;
case NNG_LOG_INFO:
pri = LOG_INFO;
break;
case NNG_LOG_DEBUG:
pri = LOG_DEBUG;
break;
default:
pri = LOG_INFO;
break;
}
switch (facility) {
case NNG_LOG_DAEMON:
pri |= LOG_DAEMON;
break;
case NNG_LOG_USER:
pri |= LOG_USER;
break;
case NNG_LOG_AUTH:
pri |= LOG_AUTHPRIV;
break;
case NNG_LOG_LOCAL0:
pri |= LOG_LOCAL0;
break;
case NNG_LOG_LOCAL1:
pri |= LOG_LOCAL1;
break;
case NNG_LOG_LOCAL2:
pri |= LOG_LOCAL2;
break;
case NNG_LOG_LOCAL3:
pri |= LOG_LOCAL3;
break;
case NNG_LOG_LOCAL4:
pri |= LOG_LOCAL4;
break;
case NNG_LOG_LOCAL5:
pri |= LOG_LOCAL5;
break;
case NNG_LOG_LOCAL6:
pri |= LOG_LOCAL6;
break;
case NNG_LOG_LOCAL7:
pri |= LOG_LOCAL7;
break;
}
if (msgid) {
syslog(pri, "%s: %s", msgid, msg);
} else {
syslog(pri, "%s", msg);
}
#else
// everyone else just goes to stderr for now
nng_stderr_logger(level, facility, msgid, msg);
#endif
}
static void
nni_vlog(nng_log_level level, nng_log_facility facility, const char *msgid,
const char *msg, va_list ap)
{
// nobody allowed to log at LOG_EMERG or using LOG_KERN
if (level > log_level || log_level == 0 || facility == 0) {
return;
}
char formatted[512];
vsnprintf(formatted, sizeof(formatted), msg, ap);
log_logger(level, facility, msgid, formatted);
}
void
nng_log_debug(const char *msgid, const char *msg, ...)
{
va_list ap;
va_start(ap, msg);
nni_vlog(NNG_LOG_DEBUG, log_facility, msgid, msg, ap);
va_end(ap);
}
void
nng_log_info(const char *msgid, const char *msg, ...)
{
va_list ap;
va_start(ap, msg);
nni_vlog(NNG_LOG_INFO, log_facility, msgid, msg, ap);
va_end(ap);
}
void
nng_log_notice(const char *msgid, const char *msg, ...)
{
va_list ap;
va_start(ap, msg);
nni_vlog(NNG_LOG_NOTICE, log_facility, msgid, msg, ap);
va_end(ap);
}
void
nng_log_warn(const char *msgid, const char *msg, ...)
{
va_list ap;
va_start(ap, msg);
nni_vlog(NNG_LOG_WARN, log_facility, msgid, msg, ap);
va_end(ap);
}
void
nng_log_err(const char *msgid, const char *msg, ...)
{
va_list ap;
va_start(ap, msg);
nni_vlog(NNG_LOG_ERR, log_facility, msgid, msg, ap);
va_end(ap);
}
void
nng_log_auth(nng_log_level level, const char *msgid, const char *msg, ...)
{
va_list ap;
va_start(ap, msg);
nni_vlog(level, NNG_LOG_AUTH, msgid, msg, ap);
va_end(ap);
}
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