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* Altered the full text indexer to output messages as text before running
[citadel.git] / citadel / serv_fulltext.c
1 /*
2  * $Id$
3  *
4  * This module handles fulltext indexing of the message base.
5  *
6  */
7
8
9 #include "sysdep.h"
10 #include <stdlib.h>
11 #include <unistd.h>
12 #include <stdio.h>
13 #include <fcntl.h>
14 #include <signal.h>
15 #include <pwd.h>
16 #include <errno.h>
17 #include <sys/types.h>
18
19 #if TIME_WITH_SYS_TIME
20 # include <sys/time.h>
21 # include <time.h>
22 #else
23 # if HAVE_SYS_TIME_H
24 #  include <sys/time.h>
25 # else
26 #  include <time.h>
27 # endif
28 #endif
29
30 #include <sys/wait.h>
31 #include <string.h>
32 #include <limits.h>
33 #include "citadel.h"
34 #include "server.h"
35 #include "sysdep_decls.h"
36 #include "citserver.h"
37 #include "support.h"
38 #include "config.h"
39 #include "serv_extensions.h"
40 #include "database.h"
41 #include "msgbase.h"
42 #include "control.h"
43 #include "room_ops.h"
44 #include "tools.h"
45 #include "serv_fulltext.h"
46 #include "ft_wordbreaker.h"
47
48
49 long ft_newhighest = 0L;
50 long *ft_newmsgs = NULL;
51 int ft_num_msgs = 0;
52 int ft_num_alloc = 0;
53
54
55 /*
56  * Compare function
57  */
58 int longcmp(const void *rec1, const void *rec2) {
59         long i1, i2;
60
61         i1 = *(const long *)rec1;
62         i2 = *(const long *)rec2;
63
64         if (i1 > i2) return(1);
65         if (i1 < i2) return(-1);
66         return(0);
67 }
68
69
70
71
72 /*
73  * Index or de-index a message.  (op == 1 to index, 0 to de-index)
74  */
75 void ft_index_message(long msgnum, int op) {
76         int num_tokens = 0;
77         int *tokens = NULL;
78         int i, j;
79         struct cdbdata *cdb_bucket;
80         int num_msgs;
81         long *msgs;
82         char *msgtext;
83
84         lprintf(CTDL_DEBUG, "ft_index_message() %s msg %ld\n",
85                 (op ? "adding" : "removing") , msgnum
86         );
87
88         /* Output the message as text before indexing it, so we don't end up
89          * indexing a bunch of encoded base64, etc.
90          */
91         lprintf(CTDL_DEBUG, "Fetching...\n");
92         CC->redirect_buffer = malloc(SIZ);
93         CC->redirect_len = 0;
94         CC->redirect_alloc = SIZ;
95         CtdlOutputMsg(msgnum, MT_CITADEL, HEADERS_ALL, 0, 1);
96         msgtext = CC->redirect_buffer;
97         CC->redirect_buffer = NULL;
98         CC->redirect_len = 0;
99         CC->redirect_alloc = 0;
100         lprintf(CTDL_DEBUG, "Wordbreaking...\n");
101         wordbreaker(msgtext, &num_tokens, &tokens);
102         free(msgtext);
103
104         lprintf(CTDL_DEBUG, "Indexing...\n");
105         if (num_tokens > 0) {
106                 for (i=0; i<num_tokens; ++i) {
107
108                         /* Add the message to the relevant token bucket */
109
110                         /* FIXME lock the file */
111                         cdb_bucket = cdb_fetch(CDB_FULLTEXT, &tokens[i], sizeof(int));
112                         if (cdb_bucket == NULL) {
113                                 cdb_bucket = malloc(sizeof(struct cdbdata));
114                                 cdb_bucket->len = 0;
115                                 cdb_bucket->ptr = NULL;
116                                 num_msgs = 0;
117                         }
118                         else {
119                                 num_msgs = cdb_bucket->len / sizeof(long);
120                         }
121
122                         if (op == 1) {  /* add to index */
123                                 ++num_msgs;
124                                 cdb_bucket->ptr = realloc(cdb_bucket->ptr, num_msgs*sizeof(long) );
125                                 msgs = (long *) cdb_bucket->ptr;
126                                 msgs[num_msgs - 1] = msgnum;
127                         }
128
129                         if (op == 0) {  /* remove from index */
130                                 if (num_msgs >= 1) {
131                                 msgs = (long *) cdb_bucket->ptr;
132                                         for (j=0; j<num_msgs; ++j) {
133                                                 if (msgs[j] == msgnum) {
134                                                         memmove(&msgs[j], &msgs[j+1], ((num_msgs - j - 1)*sizeof(long)));
135                                                         --num_msgs;
136                                                 }
137                                         }
138                                 }
139                         }
140
141                         /* sort and purge dups */
142                         if ( (op == 1) && (num_msgs > 1) ) {
143                                 msgs = (long *) cdb_bucket->ptr;
144                                 qsort(msgs, num_msgs, sizeof(long), longcmp);
145                                 for (j=0; j<(num_msgs-1); ++j) {
146                                         if (msgs[j] == msgs[j+1]) {
147                                                 memmove(&msgs[j], &msgs[j+1], ((num_msgs - j - 1)*sizeof(long)));
148                                                 --num_msgs;
149                                         }
150                                 }
151                         }
152
153                         cdb_store(CDB_FULLTEXT, &tokens[i], sizeof(int),
154                                 msgs, (num_msgs*sizeof(long)) );
155
156                         cdb_free(cdb_bucket);
157
158                         /* FIXME unlock the file */
159                 }
160
161                 free(tokens);
162         }
163 }
164
165
166
167 /*
168  * Add a message to the list of those to be indexed.
169  */
170 void ft_index_msg(long msgnum, void *userdata) {
171
172         if ((msgnum > CitControl.MMfulltext) && (msgnum <= ft_newhighest)) {
173                 ++ft_num_msgs;
174                 if (ft_num_msgs > ft_num_alloc) {
175                         ft_num_alloc += 1024;
176                         ft_newmsgs = realloc(ft_newmsgs,
177                                 (ft_num_alloc * sizeof(long)));
178                 }
179                 ft_newmsgs[ft_num_msgs - 1] = msgnum;
180         }
181
182 }
183
184 /*
185  * Scan a room for messages to index.
186  */
187 void ft_index_room(struct ctdlroom *qrbuf, void *data)
188 {
189         getroom(&CC->room, qrbuf->QRname);
190         CtdlForEachMessage(MSGS_ALL, 0L, NULL, NULL, ft_index_msg, NULL);
191 }
192
193
194 /*
195  * Begin the fulltext indexing process.  (Called as an EVT_TIMER event)
196  */
197 void do_fulltext_indexing(void) {
198         int i;
199         static time_t last_index = 0L;
200         static time_t last_progress = 0L;
201
202         /*
203          * Make sure we don't run the indexer too frequently.
204          * FIXME move the setting into config
205          */
206         if ( (time(NULL) - last_index) < 300L) {
207                 return;
208         }
209
210         /*
211          * Check to see whether the fulltext index is up to date; if there
212          * are no messages to index, don't waste any more time trying.
213          */
214         if (CitControl.MMfulltext >= CitControl.MMhighest) {
215                 return;         /* nothing to do! */
216         }
217
218         lprintf(CTDL_DEBUG, "do_fulltext_indexing() started\n");
219         
220         /*
221          * If we've switched wordbreaker modules, burn the index and start
222          * over.  FIXME write this...
223          */
224         if (CitControl.fulltext_wordbreaker != FT_WORDBREAKER_ID) {
225                 lprintf(CTDL_INFO, "(re)initializing full text index\n");
226                 cdb_trunc(CDB_FULLTEXT);
227                 CitControl.MMfulltext = 0L;
228                 put_control();
229         }
230
231         /*
232          * Now go through each room and find messages to index.
233          */
234         ft_newhighest = CitControl.MMhighest;
235         ForEachRoom(ft_index_room, NULL);       /* load all msg pointers */
236
237         if (ft_num_msgs > 0) {
238                 qsort(ft_newmsgs, ft_num_msgs, sizeof(long), longcmp);
239                 for (i=0; i<(ft_num_msgs-1); ++i) { /* purge dups */
240                         if (ft_newmsgs[i] == ft_newmsgs[i+1]) {
241                                 memmove(&ft_newmsgs[i], &ft_newmsgs[i+1],
242                                         ((ft_num_msgs - i - 1)*sizeof(long)));
243                                 --ft_num_msgs;
244                         }
245                 }
246
247                 /* Here it is ... do each message! */
248                 for (i=0; i<ft_num_msgs; ++i) {
249                         if ((time(NULL) - last_progress) > 10) {
250                                 lprintf(CTDL_DEBUG,
251                                         "Indexed %d of %d messages (%d%%)\n",
252                                                 i, ft_num_msgs,
253                                                 ((i*100) / ft_num_msgs)
254                                 );
255                                 last_progress = time(NULL);
256                         }
257                         ft_index_message(ft_newmsgs[i], 1);
258                 }
259
260                 free(ft_newmsgs);
261                 ft_num_msgs = 0;
262                 ft_num_alloc = 0;
263                 ft_newmsgs = NULL;
264         }
265
266         /* Save our place so we don't have to do this again */
267         CitControl.MMfulltext = ft_newhighest;
268         CitControl.fulltext_wordbreaker = FT_WORDBREAKER_ID;
269         put_control();
270         last_index = time(NULL);
271
272         lprintf(CTDL_DEBUG, "do_fulltext_indexing() finished\n");
273         return;
274 }
275
276
277 /*
278  * API call to perform searches.
279  * (This one does the "all of these words" search.)
280  * Caller is responsible for freeing the message list.
281  */
282 void ft_search(int *fts_num_msgs, long **fts_msgs, char *search_string) {
283         int num_tokens = 0;
284         int *tokens = NULL;
285         int i, j;
286         struct cdbdata *cdb_bucket;
287         int num_msgs;
288         long *msgs;
289         int num_all_msgs = 0;
290         long *all_msgs = NULL;
291         int num_ret_msgs = 0;
292         int num_ret_alloc = 0;
293         long *ret_msgs = NULL;
294
295         wordbreaker(search_string, &num_tokens, &tokens);
296         if (num_tokens > 0) {
297                 for (i=0; i<num_tokens; ++i) {
298
299                         /* search for tokens[i] */
300                         cdb_bucket = cdb_fetch(CDB_FULLTEXT, &tokens[i],
301                                                                 sizeof(int));
302                         if (cdb_bucket != NULL) {
303                                 num_msgs = cdb_bucket->len / sizeof(long);
304                                 msgs = (long *)cdb_bucket->ptr;
305
306                                 num_all_msgs += num_msgs;
307                                 if (num_all_msgs > 0) {
308                                         all_msgs = realloc(all_msgs,
309                                                 num_all_msgs*sizeof(long) );
310                                         memcpy(&all_msgs[num_all_msgs-num_msgs],
311                                                 msgs, num_msgs*sizeof(long) );
312                                 }
313
314                                 cdb_free(cdb_bucket);
315                         }
316
317                 }
318                 free(tokens);
319                 qsort(all_msgs, num_all_msgs, sizeof(long), longcmp);
320
321                 /*
322                  * At this point, if a message appears num_tokens times in the
323                  * list, then it contains all of the search tokens.
324                  */
325                 if (num_all_msgs >= num_tokens)
326                    for (j=0; j<(num_all_msgs-num_tokens+1); ++j) {
327                         if (all_msgs[j] == all_msgs[j+num_tokens-1]) {
328
329                                 ++num_ret_msgs;
330                                 if (num_ret_msgs > num_ret_alloc) {
331                                         num_ret_alloc += 64;
332                                         ret_msgs = realloc(ret_msgs,
333                                                 (num_ret_alloc*sizeof(long)) );
334                                 }
335                                 ret_msgs[num_ret_msgs - 1] = all_msgs[j];
336
337                         }
338                 }
339
340                 free(all_msgs);
341         }
342         
343         *fts_num_msgs = num_ret_msgs;
344         *fts_msgs = ret_msgs;
345 }
346
347
348 /*
349  * Tentative form of a search command
350  */
351 void cmd_srch(char *argbuf) {
352         int num_msgs = 0;
353         long *msgs = NULL;
354         int i;
355         char search_string[256];
356
357         if (CtdlAccessCheck(ac_logged_in)) return;
358         extract_token(search_string, argbuf, 0, '|', sizeof search_string);
359         ft_search(&num_msgs, &msgs, search_string);
360
361         cprintf("%d %d msgs match all search words:\n",
362                 LISTING_FOLLOWS, num_msgs);
363         if (num_msgs > 0) {
364                 for (i=0; i<num_msgs; ++i) {
365                         cprintf("%ld\n", msgs[i]);
366                 }
367         }
368         if (msgs != NULL) free(msgs);
369         cprintf("000\n");
370 }
371
372
373 /*****************************************************************************/
374
375 char *serv_fulltext_init(void)
376 {
377         CtdlRegisterSessionHook(do_fulltext_indexing, EVT_TIMER);
378         CtdlRegisterProtoHook(cmd_srch, "SRCH", "Full text search");
379         return "$Id$";
380 }