server/common/logger.C

/*
 * This file is part of Deliantra, the Roguelike Realtime MMORPG.
 * 
 * Copyright (©) 2005,2006,2007,2008,2009,2010,2011 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;
};

typedef std::vector<logline, slice_allocator<logline> > logvector;

static SMUTEX(mutex);
static SMUTEX(fdlock);
static SCOND(cond);
static int logfd = STDERR_FILENO;
static int logsync = 1;
static logvector queue;

int log_setfd (int fd)
{
  SMUTEX_LOCK (fdlock);
  int old = logfd;
  logfd = fd < 0 ? STDERR_FILENO : fd;
  SMUTEX_UNLOCK (fdlock);

  return old;
}

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

static void
log_sync (logline &line)
{
  static const char levelchar [16+1] = "EWIDt???????????";
  struct tm lt;
  char pfx [PREFIX_LEN];

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

  sprintf (pfx, "%04d-%02d-%02d %02d:%02d:%02d.%04d %c",
    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),
    levelchar [line.flags & 15]
  );

  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;

  if (logsync != 2)
    SMUTEX_LOCK (fdlock);

  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] = '+';
    }

  if (logsync != 2)
    SMUTEX_UNLOCK (fdlock);

  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 ())
        {
          if (idx < 32)
            queue.clear ();
          else
            logvector ().swap (queue); // free memory, hopefully

          idx = 0;
        }

      SMUTEX_UNLOCK (mutex);

      log_sync (line);
    }
}

void
log_cleanup ()
{
  logsync = 1;
  SMUTEX_UNLOCK (fdlock);

  for (;;)
    {
      int done;

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

      if (done)
        break;

      usleep (10000);
      SMUTEX_LOCK (fdlock);
      SMUTEX_UNLOCK (fdlock);
    }
}

static void
af_child ()
{
  logsync = 2;
}

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);
    }
}

static int suspended;

void
log_suspend ()
{
  if (!suspended++)
    {
      LOG (llevDebug, "logging suspended.");
      SMUTEX_LOCK (fdlock);
    }
}

void
log_resume ()
{
  if (!--suspended)
    {
      SMUTEX_UNLOCK (fdlock);
      LOG (llevDebug, "logging resumed.");
    }
}

Revision:	1.27
Committed:	Sat Apr 23 04:56:46 2011 UTC (13 years, 1 month ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.26:	+1 -1 lines
Log Message:	update copyright to 2011
#	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	1.27	* Copyright (©) 2005,2006,2007,2008,2009,2010,2011 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	root	1.25	typedef std::vector<logline, slice_allocator<logline> > logvector;
44
45	root	1.17	static SMUTEX(mutex);
46	root	1.24	static SMUTEX(fdlock);
47	root	1.17	static SCOND(cond);
48			static int logfd = STDERR_FILENO;
49			static int logsync = 1;
50	root	1.25	static logvector queue;
51	root	1.17
52	root	1.24	int log_setfd (int fd)
53	root	1.17	{
54	root	1.24	SMUTEX_LOCK (fdlock);
55			int old = logfd;
56	root	1.17	logfd = fd < 0 ? STDERR_FILENO : fd;
57	root	1.24	SMUTEX_UNLOCK (fdlock);
58
59			return old;
60	root	1.17	}
61
62	root	1.26	#define PREFIX_LEN sizeof ("0000-00-00 00:00:00.0000 L+") - 1
63	root	1.17
64			static void
65			log_sync (logline &line)
66			{
67	root	1.26	static const char levelchar [16+1] = "EWIDt???????????";
68	root	1.18	struct tm lt;
69	root	1.17	char pfx [PREFIX_LEN];
70
71	root	1.18	localtime_r (&line.tv.tv_sec, &lt);
72
73	root	1.26	sprintf (pfx, "%04d-%02d-%02d %02d:%02d:%02d.%04d %c",
74	root	1.18	lt.tm_year + 1900,
75			lt.tm_mon + 1,
76			lt.tm_mday,
77			lt.tm_hour,
78			lt.tm_min,
79			lt.tm_sec,
80	root	1.26	(int)(line.tv.tv_usec / 100),
81			levelchar [line.flags & 15]
82	root	1.17	);
83
84			pfx [PREFIX_LEN - 1] = line.flags & logSync ? '=' : ' ';
85
86			struct iovec iov [2];
87
88			iov [0].iov_base = pfx;
89			iov [0].iov_len = PREFIX_LEN;
90
91			char *buf = line.buf;
92
93	root	1.24	if (logsync != 2)
94			SMUTEX_LOCK (fdlock);
95
96	root	1.17	while (char *end = strchr (buf, '\n'))
97			{
98			iov [1].iov_base = buf;
99			iov [1].iov_len = end - buf + 1;
100
101			writev (STDERR_FILENO, iov, 2);
102			if (logfd != STDERR_FILENO)
103			writev (logfd, iov, 2);
104
105			buf = end + 1;
106
107			if (buf == line.buf + line.len)
108			break;
109
110			pfx [PREFIX_LEN - 1] = '+';
111			}
112
113	root	1.24	if (logsync != 2)
114			SMUTEX_UNLOCK (fdlock);
115
116	root	1.17	sfree (line.buf, line.len);
117			}
118
119			static void *
120			logthread_proc (void *arg)
121			{
122			int idx = 0;
123
124			for (;;)
125			{
126			logline line;
127
128			SMUTEX_LOCK (mutex);
129
130			while (queue.empty ())
131			SCOND_WAIT (cond, mutex);
132
133			line = queue [idx++];
134
135			// this algorithm could result in an ever-increasing vector
136			// size if we log faster than we can write, but if that happens
137			// we have bigger problems.
138			if (idx == queue.size ())
139			{
140	root	1.25	if (idx < 32)
141			queue.clear ();
142			else
143			logvector ().swap (queue); // free memory, hopefully
144
145	root	1.17	idx = 0;
146			}
147
148			SMUTEX_UNLOCK (mutex);
149
150			log_sync (line);
151			}
152			}
153
154			void
155			log_cleanup ()
156			{
157			logsync = 1;
158	root	1.25	SMUTEX_UNLOCK (fdlock);
159	root	1.17
160			for (;;)
161			{
162			int done;
163
164			SMUTEX_LOCK (mutex);
165			done = queue.empty ();
166			SMUTEX_UNLOCK (mutex);
167
168			if (done)
169			break;
170
171			usleep (10000);
172	root	1.24	SMUTEX_LOCK (fdlock);
173			SMUTEX_UNLOCK (fdlock);
174	root	1.17	}
175			}
176
177			static void
178			af_child ()
179			{
180	root	1.24	logsync = 2;
181	root	1.17	}
182
183			static struct logthread : thread
184			{
185			logthread ()
186			{
187			pthread_atfork (0, 0, af_child);
188			start (logthread_proc);
189			logsync = 0;
190			}
191			} logthread;
192	elmex	1.1
193	root	1.4	void
194	root	1.22	LOG (int flags, const_utf8_string format, ...)
195	elmex	1.1	{
196	root	1.12	int level = flags & 15;
197
198			if (level > settings.debug)
199			return;
200
201	root	1.17	logline line;
202			gettimeofday (&line.tv, 0);
203	root	1.12
204	root	1.17	static dynbuf_text buf;
205	root	1.12
206			va_list ap;
207			va_start (ap, format);
208	root	1.17	buf.vprintf (format, ap);
209	root	1.12	va_end (ap);
210
211	root	1.17	buf << '\n';
212
213			line.buf = buf.linearise ();
214			line.len = buf.size ();
215	root	1.12
216	root	1.17	if (line.buf [line.len - 2] == '\n')
217			--line.len;
218	root	1.14
219	root	1.17	line.buf = salloc<char> (line.len, line.buf);
220
221			buf.clear ();
222
223			if (logsync)
224			flags \|= logSync;
225	root	1.12
226			if (flags & logBacktrace)
227	root	1.17	{
228			line.buf [line.len - 1] = 0;
229			log_backtrace (line.buf);
230			line.buf [line.len - 1] = '\n';
231			}
232
233			line.flags = flags;
234
235			if (line.flags & logSync)
236			log_sync (line);
237			else
238			{
239			SMUTEX_LOCK (mutex);
240			queue.push_back (line);
241			SMUTEX_UNLOCK (mutex);
242			SCOND_SIGNAL (cond);
243			}
244	elmex	1.1	}
245	root	1.17
246	root	1.24	static int suspended;
247
248			void
249			log_suspend ()
250			{
251			if (!suspended++)
252			{
253			LOG (llevDebug, "logging suspended.");
254			SMUTEX_LOCK (fdlock);
255			}
256			}
257
258			void
259			log_resume ()
260			{
261			if (!--suspended)
262			{
263			SMUTEX_UNLOCK (fdlock);
264			LOG (llevDebug, "logging resumed.");
265			}
266			}
267