2 This file is part of GNUnet.
3 (C) 2009 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 2, or (at your
8 option) any later version.
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
22 * @file statistics/gnunet-service-statistics.c
23 * @brief program that tracks statistics
24 * @author Christian Grothoff
27 #include "gnunet_disk_lib.h"
28 #include "gnunet_getopt_lib.h"
29 #include "gnunet_protocols.h"
30 #include "gnunet_service_lib.h"
31 #include "gnunet_statistics_service.h"
32 #include "gnunet_strings_lib.h"
33 #include "gnunet_time_lib.h"
34 #include "statistics.h"
37 * Entry in the statistics list.
42 * This is a linked list.
44 struct StatsEntry *next;
47 * Name of the service, points into the
53 * Name for the value, points into
59 * Message that can be used to set this value,
60 * stored at the end of the memory used by
63 struct GNUNET_STATISTICS_SetMessage *msg;
76 * Is this value persistent?
83 * Linked list of our active statistics.
85 static struct StatsEntry *start;
88 * Counter used to generate unique values.
90 static uint32_t uidgen;
93 * Load persistent values from disk. Disk format is
94 * exactly the same format that we also use for
95 * setting the values over the network.
98 load (struct GNUNET_SERVER_Handle *server,
99 struct GNUNET_CONFIGURATION_Handle *cfg)
102 struct GNUNET_DISK_FileHandle *fh;
103 struct GNUNET_DISK_MapHandle *mh;
107 const struct GNUNET_MessageHeader *msg;
109 fn = GNUNET_DISK_get_home_filename (cfg,
110 "statistics", "statistics.data", NULL);
113 if ((0 != stat (fn, &sb)) || (sb.st_size == 0))
118 fh = GNUNET_DISK_file_open (fn, GNUNET_DISK_OPEN_READ);
124 buf = GNUNET_DISK_file_map (fh, &mh, GNUNET_DISK_MAP_READ, sb.st_size);
127 GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING, "mmap", fn);
128 GNUNET_break (GNUNET_OK == GNUNET_DISK_file_close (fh));
132 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
133 _("Loading %llu bytes of statistics from `%s'\n"),
134 (unsigned long long) sb.st_size, fn);
136 while (off + sizeof (struct GNUNET_MessageHeader) < sb.st_size)
138 msg = (const struct GNUNET_MessageHeader *) &buf[off];
139 if ((ntohs (msg->size) + off > sb.st_size) ||
140 (GNUNET_OK != GNUNET_SERVER_inject (server, NULL, msg)))
145 off += ntohs (msg->size);
147 GNUNET_break (GNUNET_OK == GNUNET_DISK_file_unmap (mh));
148 GNUNET_break (GNUNET_OK == GNUNET_DISK_file_close (fh));
154 * Write persistent statistics to disk.
157 * @param cfg configuration to use
160 save (void *cls, struct GNUNET_CONFIGURATION_Handle *cfg)
162 struct StatsEntry *pos;
164 struct GNUNET_DISK_FileHandle *fh;
166 unsigned long long total;
169 fn = GNUNET_DISK_get_home_filename (cfg,
170 "statistics", "statistics.data", NULL);
172 fh = GNUNET_DISK_file_open (fn, GNUNET_DISK_OPEN_WRITE
173 | GNUNET_DISK_OPEN_CREATE | GNUNET_DISK_OPEN_TRUNCATE,
174 GNUNET_DISK_PERM_USER_READ | GNUNET_DISK_PERM_USER_WRITE);
176 while (NULL != (pos = start))
179 if ((pos->persistent) && (NULL != fh))
181 size = htons (pos->msg->header.size);
182 if (size != GNUNET_DISK_file_write (fh, pos->msg, size))
184 GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING,
186 GNUNET_DISK_file_close (fh);
196 GNUNET_DISK_file_close (fh);
198 GNUNET_break (0 == UNLINK (fn));
200 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
201 _("Wrote %llu bytes of statistics to `%s'\n"), total, fn);
203 GNUNET_free_non_null (fn);
208 * Transmit the given stats value.
211 transmit (struct GNUNET_SERVER_TransmitContext *tc,
212 const struct StatsEntry *e)
214 struct GNUNET_STATISTICS_ReplyMessage *m;
215 struct GNUNET_MessageHeader *h;
220 sizeof (struct GNUNET_STATISTICS_ReplyMessage) + strlen (e->service) + 1 +
221 strlen (e->name) + 1;
222 GNUNET_assert (size < GNUNET_SERVER_MAX_MESSAGE_SIZE);
223 msize = size - sizeof (struct GNUNET_MessageHeader);
224 m = GNUNET_malloc (size);
225 m->uid = htonl (e->uid);
227 m->uid |= htonl (GNUNET_STATISTICS_PERSIST_BIT);
228 m->value = GNUNET_htonll (e->value);
229 size -= sizeof (struct GNUNET_STATISTICS_ReplyMessage);
230 GNUNET_assert (size == GNUNET_STRINGS_buffer_fill ((char *) &m[1],
232 2, e->service, e->name));
234 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
235 "Transmitting value for `%s:%s': %llu\n",
236 e->service, e->name, e->value);
239 GNUNET_SERVER_transmit_context_append (tc,
242 GNUNET_MESSAGE_TYPE_STATISTICS_VALUE);
248 * Does this entry match the request?
251 matches (const struct StatsEntry *e, const char *service, const char *name)
253 return ((0 == strlen (service)) ||
254 (0 == strcmp (service, e->service)))
255 && ((0 == strlen (name)) || (0 == strcmp (name, e->name)));
260 * Handle GET-message.
263 * @param client identification of the client
264 * @param message the actual message
265 * @return GNUNET_OK to keep the connection open,
266 * GNUNET_SYSERR to close it (signal serious error)
269 handle_get (void *cls,
270 struct GNUNET_SERVER_Client *client,
271 const struct GNUNET_MessageHeader *message)
275 struct StatsEntry *pos;
276 struct GNUNET_SERVER_TransmitContext *tc;
279 size = ntohs (message->size) - sizeof (struct GNUNET_MessageHeader);
280 if (size != GNUNET_STRINGS_buffer_tokenize ((const char *) &message[1],
281 size, 2, &service, &name))
284 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
288 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
289 "Received request for statistics on `%s:%s'\n",
290 strlen (service) ? service : "*", strlen (name) ? name : "*");
292 tc = GNUNET_SERVER_transmit_context_create (client);
296 if (matches (pos, service, name))
300 GNUNET_SERVER_transmit_context_append (tc, NULL, 0,
301 GNUNET_MESSAGE_TYPE_STATISTICS_END);
302 GNUNET_SERVER_transmit_context_run (tc, GNUNET_TIME_UNIT_FOREVER_REL);
307 * Handle SET-message.
310 * @param client identification of the client
311 * @param message the actual message
314 handle_set (void *cls,
315 struct GNUNET_SERVER_Client *client,
316 const struct GNUNET_MessageHeader *message)
322 const struct GNUNET_STATISTICS_SetMessage *msg;
323 struct StatsEntry *pos;
324 struct StatsEntry *prev;
329 msize = ntohs (message->size);
330 if (msize < sizeof (struct GNUNET_STATISTICS_SetMessage))
333 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
336 size = msize - sizeof (struct GNUNET_STATISTICS_SetMessage);
337 msg = (const struct GNUNET_STATISTICS_SetMessage *) message;
339 if (size != GNUNET_STRINGS_buffer_tokenize ((const char *) &msg[1],
340 size, 2, &service, &name))
343 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
347 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
348 "Received request to update statistic on `%s:%s'\n",
351 flags = ntohl (msg->flags);
352 value = GNUNET_ntohll (msg->value);
357 if (matches (pos, service, name))
359 if ((flags & GNUNET_STATISTICS_SETFLAG_RELATIVE) == 0)
365 delta = (int64_t) value;
366 if ((delta < 0) && (pos->value < -delta))
372 GNUNET_break ((delta <= 0) ||
373 (pos->value + delta > pos->value));
377 pos->msg->value = GNUNET_htonll (pos->value);
378 pos->msg->flags = msg->flags;
380 (0 != (flags & GNUNET_STATISTICS_SETFLAG_PERSISTENT));
383 /* move to front for faster setting next time! */
384 prev->next = pos->next;
389 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
390 "Statistic `%s:%s' updated to value %llu.\n",
391 service, name, pos->value);
393 GNUNET_SERVER_receive_done (client, GNUNET_OK);
399 pos = GNUNET_malloc (sizeof (struct StatsEntry) + msize);
401 if (((flags & GNUNET_STATISTICS_SETFLAG_RELATIVE) == 0) ||
402 (0 < (int64_t) GNUNET_ntohll (msg->value)))
403 pos->value = GNUNET_ntohll (msg->value);
405 pos->persistent = (0 != (flags & GNUNET_STATISTICS_SETFLAG_PERSISTENT));
406 pos->msg = (void *) &pos[1];
407 memcpy (pos->msg, message, ntohs (message->size));
408 pos->service = (const char *) &pos->msg[1];
409 pos->name = &pos->service[strlen (pos->service) + 1];
413 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
414 "New statistic on `%s:%s' with value %llu created.\n",
415 service, name, pos->value);
417 GNUNET_SERVER_receive_done (client, GNUNET_OK);
422 * List of handlers for the messages understood by this
425 static struct GNUNET_SERVER_MessageHandler handlers[] = {
426 {&handle_set, NULL, GNUNET_MESSAGE_TYPE_STATISTICS_SET, 0},
427 {&handle_get, NULL, GNUNET_MESSAGE_TYPE_STATISTICS_GET, 0},
433 * Process statistics requests.
436 * @param sched scheduler to use
437 * @param server the initialized server
438 * @param cfg configuration to use
442 struct GNUNET_SCHEDULER_Handle *sched,
443 struct GNUNET_SERVER_Handle *server,
444 struct GNUNET_CONFIGURATION_Handle *cfg)
446 GNUNET_SERVER_add_handlers (server, handlers);
452 * The main function for the statistics service.
454 * @param argc number of arguments from the command line
455 * @param argv command line arguments
456 * @return 0 ok, 1 on error
459 main (int argc, char *const *argv)
462 GNUNET_SERVICE_run (argc,
464 "statistics", &run, NULL, &save, NULL)) ? 0 : 1;
467 /* end of gnunet-service-statistics.c */