server/common/logger.C

/*
 * This file is part of Deliantra, the Roguelike Realtime MMORPG.
 * 
 * Copyright (©) 2005,2006,2007,2008,2009,2010 Marc Alexander Lehmann / Robin Redeker / the Deliantra team
 * 
 * Deliantra is free software: you can redistribute it and/or modify it under
 * the terms of the Affero GNU General Public License as published by the
 * Free Software Foundation, either version 3 of the License, or (at your
 * option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the Affero GNU General Public License
 * and the GNU General Public License along with this program. If not, see
 * <http://www.gnu.org/licenses/>.
 * 
 * The authors can be reached via e-mail to <support@deliantra.net>
 */

#include <cstdarg>
#include <cstring>

#include <vector>

#include <sys/uio.h>
#include <pthread.h>

#include "global.h"
#include "dynbuf.h"
#include "util.h"

struct logline
{
  struct timeval tv;
  char *buf; // includes PREFIX_LEN garbage bytes
  int len;
  int flags;
};

static SMUTEX(mutex);
static SCOND(cond);
static int logfd = STDERR_FILENO;
static int logsync = 1;
static std::vector<logline, slice_allocator<logline> > queue;

void set_logfd (int fd)
{
  SMUTEX_LOCK (mutex);
  logfd = fd < 0 ? STDERR_FILENO : fd;
  SMUTEX_UNLOCK (mutex);
}

#define PREFIX_LEN sizeof ("0000-00-00 00:00:00.0000+") - 1

static void
log_sync (logline &line)
{
  struct tm lt;
  char pfx [PREFIX_LEN];

  localtime_r (&line.tv.tv_sec, &lt);

  sprintf (pfx, "%04d-%02d-%02d %02d:%02d:%02d.%04d",
    lt.tm_year + 1900,
    lt.tm_mon + 1,
    lt.tm_mday,
    lt.tm_hour,
    lt.tm_min,
    lt.tm_sec,
    (int)(line.tv.tv_usec / 100)
  );

  pfx [PREFIX_LEN - 1] = line.flags & logSync ? '=' : ' ';

  struct iovec iov [2];

  iov [0].iov_base = pfx;
  iov [0].iov_len = PREFIX_LEN;

  char *buf = line.buf;

  while (char *end = strchr (buf, '\n'))
    {
      iov [1].iov_base = buf;
      iov [1].iov_len = end - buf + 1;

      writev (STDERR_FILENO, iov, 2);
      if (logfd != STDERR_FILENO)
        writev (logfd, iov, 2);

      buf = end + 1;

      if (buf == line.buf + line.len)
        break;

      pfx [PREFIX_LEN - 1] = '+';
    }

  sfree (line.buf, line.len);
}

static void *
logthread_proc (void *arg)
{
  int idx = 0;

  for (;;)
    {
      logline line;

      SMUTEX_LOCK (mutex);

      while (queue.empty ())
        SCOND_WAIT (cond, mutex);

      line = queue [idx++];

      // this algorithm could result in an ever-increasing vector
      // size if we log faster than we can write, but if that happens
      // we have bigger problems.
      if (idx == queue.size ())
        {
          queue.clear ();
          idx = 0;
        }

      SMUTEX_UNLOCK (mutex);

      log_sync (line);
    }
}

void
log_cleanup ()
{
  logsync = 1;

  for (;;)
    {
      int done;

      SMUTEX_LOCK (mutex);
      done = queue.empty ();
      SMUTEX_UNLOCK (mutex);

      if (done)
        break;

      usleep (10000);
    }
}

static void
af_child ()
{
  logsync = 1;
}

static struct logthread : thread
{
  logthread ()
  {
    pthread_atfork (0, 0, af_child);
    start (logthread_proc);
    logsync = 0;
  }
} logthread;

void
LOG (int flags, const_utf8_string format, ...)
{
  int level = flags & 15;

  if (level > settings.debug)
    return;

  logline line;
  gettimeofday (&line.tv, 0);

  static dynbuf_text buf;

  va_list ap;
  va_start (ap, format);
  buf.vprintf (format, ap);
  va_end (ap);

  buf << '\n';

  line.buf = buf.linearise ();
  line.len = buf.size ();

  if (line.buf [line.len - 2] == '\n')
    --line.len;

  line.buf = salloc<char> (line.len, line.buf);

  buf.clear ();

  if (logsync)
    flags |= logSync;

  if (flags & logBacktrace)
    {
      line.buf [line.len - 1] = 0;
      log_backtrace (line.buf);
      line.buf [line.len - 1] = '\n';
    }

  line.flags = flags;

  if (line.flags & logSync)
    log_sync (line);
  else
    {
      SMUTEX_LOCK (mutex);
      queue.push_back (line);
      SMUTEX_UNLOCK (mutex);
      SCOND_SIGNAL (cond);
    }
}

Revision:	1.23
Committed:	Fri Mar 26 01:04:44 2010 UTC (14 years, 2 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.22:	+1 -1 lines
Log Message:	update copyright for up to 2010
#	User	Rev	Content
1	elmex	1.1	/*
2	root	1.16	* This file is part of Deliantra, the Roguelike Realtime MMORPG.
3	pippijn	1.11	*
4	root	1.23	* Copyright (©) 2005,2006,2007,2008,2009,2010 Marc Alexander Lehmann / Robin Redeker / the Deliantra team
5	pippijn	1.11	*
6	root	1.20	* Deliantra is free software: you can redistribute it and/or modify it under
7			* the terms of the Affero GNU General Public License as published by the
8			* Free Software Foundation, either version 3 of the License, or (at your
9			* option) any later version.
10	pippijn	1.11	*
11	root	1.15	* This program is distributed in the hope that it will be useful,
12			* but WITHOUT ANY WARRANTY; without even the implied warranty of
13			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14			* GNU General Public License for more details.
15	pippijn	1.11	*
16	root	1.20	* You should have received a copy of the Affero GNU General Public License
17			* and the GNU General Public License along with this program. If not, see
18			* <http://www.gnu.org/licenses/>.
19	root	1.13	*
20	root	1.16	* The authors can be reached via e-mail to <support@deliantra.net>
21	pippijn	1.11	*/
22	elmex	1.1
23	root	1.12	#include <cstdarg>
24	root	1.17	#include <cstring>
25
26			#include <vector>
27
28			#include <sys/uio.h>
29			#include <pthread.h>
30
31			#include "global.h"
32			#include "dynbuf.h"
33			#include "util.h"
34
35			struct logline
36			{
37			struct timeval tv;
38			char *buf; // includes PREFIX_LEN garbage bytes
39			int len;
40			int flags;
41			};
42
43			static SMUTEX(mutex);
44			static SCOND(cond);
45			static int logfd = STDERR_FILENO;
46			static int logsync = 1;
47			static std::vector<logline, slice_allocator<logline> > queue;
48
49			void set_logfd (int fd)
50			{
51			SMUTEX_LOCK (mutex);
52			logfd = fd < 0 ? STDERR_FILENO : fd;
53			SMUTEX_UNLOCK (mutex);
54			}
55
56			#define PREFIX_LEN sizeof ("0000-00-00 00:00:00.0000+") - 1
57
58			static void
59			log_sync (logline &line)
60			{
61	root	1.18	struct tm lt;
62	root	1.17	char pfx [PREFIX_LEN];
63
64	root	1.18	localtime_r (&line.tv.tv_sec, &lt);
65
66	root	1.17	sprintf (pfx, "%04d-%02d-%02d %02d:%02d:%02d.%04d",
67	root	1.18	lt.tm_year + 1900,
68			lt.tm_mon + 1,
69			lt.tm_mday,
70			lt.tm_hour,
71			lt.tm_min,
72			lt.tm_sec,
73	root	1.17	(int)(line.tv.tv_usec / 100)
74			);
75
76			pfx [PREFIX_LEN - 1] = line.flags & logSync ? '=' : ' ';
77
78			struct iovec iov [2];
79
80			iov [0].iov_base = pfx;
81			iov [0].iov_len = PREFIX_LEN;
82
83			char *buf = line.buf;
84
85			while (char *end = strchr (buf, '\n'))
86			{
87			iov [1].iov_base = buf;
88			iov [1].iov_len = end - buf + 1;
89
90			writev (STDERR_FILENO, iov, 2);
91			if (logfd != STDERR_FILENO)
92			writev (logfd, iov, 2);
93
94			buf = end + 1;
95
96			if (buf == line.buf + line.len)
97			break;
98
99			pfx [PREFIX_LEN - 1] = '+';
100			}
101
102			sfree (line.buf, line.len);
103			}
104
105			static void *
106			logthread_proc (void *arg)
107			{
108			int idx = 0;
109
110			for (;;)
111			{
112			logline line;
113
114			SMUTEX_LOCK (mutex);
115
116			while (queue.empty ())
117			SCOND_WAIT (cond, mutex);
118
119			line = queue [idx++];
120
121			// this algorithm could result in an ever-increasing vector
122			// size if we log faster than we can write, but if that happens
123			// we have bigger problems.
124			if (idx == queue.size ())
125			{
126			queue.clear ();
127			idx = 0;
128			}
129
130			SMUTEX_UNLOCK (mutex);
131
132			log_sync (line);
133			}
134			}
135
136			void
137			log_cleanup ()
138			{
139			logsync = 1;
140
141			for (;;)
142			{
143			int done;
144
145			SMUTEX_LOCK (mutex);
146			done = queue.empty ();
147			SMUTEX_UNLOCK (mutex);
148
149			if (done)
150			break;
151
152			usleep (10000);
153			}
154			}
155
156			static void
157			af_child ()
158			{
159			logsync = 1;
160			}
161
162			static struct logthread : thread
163			{
164			logthread ()
165			{
166			pthread_atfork (0, 0, af_child);
167			start (logthread_proc);
168			logsync = 0;
169			}
170			} logthread;
171	elmex	1.1
172	root	1.4	void
173	root	1.22	LOG (int flags, const_utf8_string format, ...)
174	elmex	1.1	{
175	root	1.12	int level = flags & 15;
176
177			if (level > settings.debug)
178			return;
179
180	root	1.17	logline line;
181			gettimeofday (&line.tv, 0);
182	root	1.12
183	root	1.17	static dynbuf_text buf;
184	root	1.12
185			va_list ap;
186			va_start (ap, format);
187	root	1.17	buf.vprintf (format, ap);
188	root	1.12	va_end (ap);
189
190	root	1.17	buf << '\n';
191
192			line.buf = buf.linearise ();
193			line.len = buf.size ();
194	root	1.12
195	root	1.17	if (line.buf [line.len - 2] == '\n')
196			--line.len;
197	root	1.14
198	root	1.17	line.buf = salloc<char> (line.len, line.buf);
199
200			buf.clear ();
201
202			if (logsync)
203			flags \|= logSync;
204	root	1.12
205			if (flags & logBacktrace)
206	root	1.17	{
207			line.buf [line.len - 1] = 0;
208			log_backtrace (line.buf);
209			line.buf [line.len - 1] = '\n';
210			}
211
212			line.flags = flags;
213
214			if (line.flags & logSync)
215			log_sync (line);
216			else
217			{
218			SMUTEX_LOCK (mutex);
219			queue.push_back (line);
220			SMUTEX_UNLOCK (mutex);
221			SCOND_SIGNAL (cond);
222			}
223	elmex	1.1	}
224	root	1.17