transmission/libtransmission/log.c

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/*
* This file Copyright (C) Mnemosyne LLC
*
* This file is licensed by the GPL version 2. Works owned by the
* Transmission project are granted a special exemption to clause 2 (b)
* so that the bulk of its code can remain under the MIT license.
* This exemption does not extend to derived works not owned by
* the Transmission project.
*
* $Id: utils.c 13863 2013-01-24 23:59:52Z jordan $
*/
#include <assert.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h> /* getenv() */
#include <event2/buffer.h>
#include "transmission.h"
#include "log.h"
#include "platform.h" /* tr_lock */
#include "utils.h"
tr_log_level __tr_message_level = TR_LOG_ERROR;
static bool myQueueEnabled = false;
static tr_log_message * myQueue = NULL;
static tr_log_message ** myQueueTail = &myQueue;
static int myQueueLength = 0;
#ifndef WIN32
/* make null versions of these win32 functions */
static inline int IsDebuggerPresent (void) { return false; }
static inline void OutputDebugStringA (const void * unused UNUSED) { }
#endif
/***
****
***/
tr_log_level
tr_logGetLevel (void)
{
return __tr_message_level;
}
/***
****
***/
static tr_lock*
getMessageLock (void)
{
static tr_lock * l = NULL;
if (!l)
l = tr_lockNew ();
return l;
}
void*
tr_logGetFile (void)
{
static bool initialized = false;
static FILE * file = NULL;
if (!initialized)
{
int fd = 0;
const char * str = getenv ("TR_DEBUG_FD");
if (str && *str)
fd = atoi (str);
switch (fd)
{
case 1:
file = stdout;
break;
case 2:
file = stderr;
break;
default:
file = NULL;
break;
}
initialized = true;
}
return file;
}
void
tr_logSetLevel (tr_log_level level)
{
__tr_message_level = level;
}
void
tr_logSetQueueEnabled (bool isEnabled)
{
assert (tr_isBool (isEnabled));
myQueueEnabled = isEnabled;
}
bool
tr_logGetQueueEnabled (void)
{
return myQueueEnabled;
}
tr_log_message *
tr_logGetQueue (void)
{
tr_log_message * ret;
tr_lockLock (getMessageLock ());
ret = myQueue;
myQueue = NULL;
myQueueTail = &myQueue;
myQueueLength = 0;
tr_lockUnlock (getMessageLock ());
return ret;
}
void
tr_logFreeQueue (tr_log_message * list)
{
tr_log_message * next;
while (NULL != list)
{
next = list->next;
free (list->message);
free (list->name);
free (list);
list = next;
}
}
/**
***
**/
char*
tr_logGetTimeStr (char * buf, int buflen)
{
char tmp[64];
struct tm now_tm;
struct timeval tv;
time_t seconds;
int milliseconds;
tr_gettimeofday (&tv);
seconds = tv.tv_sec;
tr_localtime_r (&seconds, &now_tm);
strftime (tmp, sizeof (tmp), "%H:%M:%S", &now_tm);
milliseconds = tv.tv_usec / 1000;
tr_snprintf (buf, buflen, "%s.%03d", tmp, milliseconds);
return buf;
}
bool
tr_logGetDeepEnabled (void)
{
static int8_t deepLoggingIsActive = -1;
if (deepLoggingIsActive < 0)
deepLoggingIsActive = IsDebuggerPresent () || (tr_logGetFile ()!=NULL);
return deepLoggingIsActive != 0;
}
void
tr_logAddDeep (const char * file,
int line,
const char * name,
const char * fmt,
...)
{
FILE * fp = tr_logGetFile ();
if (fp || IsDebuggerPresent ())
{
va_list args;
char timestr[64];
char * message;
struct evbuffer * buf = evbuffer_new ();
char * base = tr_basename (file);
evbuffer_add_printf (buf, "[%s] ",
tr_logGetTimeStr (timestr, sizeof (timestr)));
if (name)
evbuffer_add_printf (buf, "%s ", name);
va_start (args, fmt);
evbuffer_add_vprintf (buf, fmt, args);
va_end (args);
evbuffer_add_printf (buf, " (%s:%d)\n", base, line);
/* FIXME (libevent2) ifdef this out for nonwindows platforms */
message = evbuffer_free_to_str (buf);
OutputDebugStringA (message);
if (fp)
fputs (message, fp);
tr_free (message);
tr_free (base);
}
}
/***
****
***/
void
tr_logAddMessage (const char * file,
int line,
tr_log_level level,
const char * name,
const char * fmt,
...)
{
const int err = errno; /* message logging shouldn't affect errno */
char buf[1024];
va_list ap;
tr_lockLock (getMessageLock ());
/* build the text message */
*buf = '\0';
va_start (ap, fmt);
evutil_vsnprintf (buf, sizeof (buf), fmt, ap);
va_end (ap);
OutputDebugStringA (buf);
if (*buf)
{
if (tr_logGetQueueEnabled ())
{
tr_log_message * newmsg;
newmsg = tr_new0 (tr_log_message, 1);
newmsg->level = level;
newmsg->when = tr_time ();
newmsg->message = tr_strdup (buf);
newmsg->file = file;
newmsg->line = line;
newmsg->name = tr_strdup (name);
*myQueueTail = newmsg;
myQueueTail = &newmsg->next;
++myQueueLength;
if (myQueueLength > TR_LOG_MAX_QUEUE_LENGTH)
{
tr_log_message * old = myQueue;
myQueue = old->next;
old->next = NULL;
tr_logFreeQueue (old);
--myQueueLength;
assert (myQueueLength == TR_LOG_MAX_QUEUE_LENGTH);
}
}
else
{
FILE * fp;
char timestr[64];
fp = tr_logGetFile ();
if (fp == NULL)
fp = stderr;
tr_logGetTimeStr (timestr, sizeof (timestr));
if (name)
fprintf (fp, "[%s] %s: %s\n", timestr, name, buf);
else
fprintf (fp, "[%s] %s\n", timestr, buf);
fflush (fp);
}
}
tr_lockUnlock (getMessageLock ());
errno = err;
}