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3dc3d7db RK |
1 | /* |
2 | * This file is part of DisOrder | |
3 | * Copyright (C) 2007 Richard Kettlewell | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * This program 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. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 | |
18 | * USA | |
19 | */ | |
20 | ||
21 | #include <config.h> | |
22 | #include "types.h" | |
23 | ||
24 | #include <string.h> | |
25 | #include <getopt.h> | |
26 | #include <db.h> | |
27 | #include <locale.h> | |
28 | #include <errno.h> | |
29 | #include <syslog.h> | |
30 | #include <pcre.h> | |
31 | ||
32 | #include "syscalls.h" | |
33 | #include "log.h" | |
34 | #include "defs.h" | |
35 | #include "kvp.h" | |
36 | #include "trackdb.h" | |
37 | #include "trackdb-int.h" | |
38 | #include "mem.h" | |
39 | #include "configuration.h" | |
40 | #include "unicode.h" | |
41 | ||
42 | static DB_TXN *global_tid; | |
43 | ||
44 | static const struct option options[] = { | |
45 | { "help", no_argument, 0, 'h' }, | |
46 | { "version", no_argument, 0, 'V' }, | |
47 | { "config", required_argument, 0, 'c' }, | |
48 | { "debug", no_argument, 0, 'd' }, | |
49 | { "no-debug", no_argument, 0, 'D' }, | |
50 | { "syslog", no_argument, 0, 's' }, | |
51 | { "no-syslog", no_argument, 0, 'S' }, | |
52 | { 0, 0, 0, 0 } | |
53 | }; | |
54 | ||
55 | /* display usage message and terminate */ | |
56 | static void help(void) { | |
57 | xprintf("Usage:\n" | |
58 | " disorder-dbupgrade [OPTIONS]\n" | |
59 | "Options:\n" | |
60 | " --help, -h Display usage message\n" | |
61 | " --version, -V Display version number\n" | |
62 | " --config PATH, -c PATH Set configuration file\n" | |
63 | " --debug, -d Turn on debugging\n" | |
64 | " --[no-]syslog Force logging\n" | |
65 | "\n" | |
66 | "Database upgrader for DisOrder. Not intended to be run\n" | |
67 | "directly.\n"); | |
68 | xfclose(stdout); | |
69 | exit(0); | |
70 | } | |
71 | ||
72 | /* display version number and terminate */ | |
73 | static void version(void) { | |
74 | xprintf("disorder-dbupgrade version %s\n", disorder_version_string); | |
75 | xfclose(stdout); | |
76 | exit(0); | |
77 | } | |
78 | ||
79 | /** @brief Visit each key in a database and call @p callback | |
80 | * @return 0 or DB_LOCK_DEADLOCK | |
81 | * | |
82 | * @p global_tid must be set. @p callback should return 0 or DB_LOCK_DEADLOCK. | |
83 | */ | |
84 | static int scan_core(const char *name, DB *db, | |
85 | int (*callback)(const char *name, DB *db, DBC *c, | |
86 | DBT *k, DBT *d)) { | |
87 | long count = 0; | |
88 | DBC *c = trackdb_opencursor(db, global_tid); | |
89 | int err, r = 0; | |
90 | DBT k[1], d[1]; | |
91 | ||
92 | memset(k, 0, sizeof k); | |
93 | memset(d, 0, sizeof d); | |
94 | while((err = c->c_get(c, k, d, DB_NEXT)) == 0) { | |
95 | if((err = callback(name, db, c, k, d))) | |
96 | break; | |
97 | ++count; | |
98 | if(count % 1000 == 0) | |
99 | info("scanning %s, %ld so far", name, count); | |
100 | } | |
101 | if(err && err != DB_NOTFOUND && err != DB_LOCK_DEADLOCK) | |
102 | fatal(0, "%s: error scanning database: %s", name, db_strerror(err)); | |
103 | r = (err == DB_LOCK_DEADLOCK ? err : 0); | |
104 | if((err = c->c_close(c))) | |
105 | fatal(0, "%s: error closing cursor: %s", name, db_strerror(err)); | |
106 | return r; | |
107 | } | |
108 | ||
109 | /** @brief Visit each key in a database and call @p callback | |
110 | * | |
111 | * Everything happens inside the @p global_tid tranasction. @p callback | |
112 | * should return 0 or DB_LOCK_DEADLOCK. | |
113 | */ | |
114 | static void scan(const char *name, DB *db, | |
115 | int (*callback)(const char *name, DB *db, DBC *c, | |
116 | DBT *k, DBT *d)) { | |
117 | info("scanning %s", name); | |
118 | for(;;) { | |
119 | global_tid = trackdb_begin_transaction(); | |
120 | if(scan_core(name, db, callback)) { | |
121 | trackdb_abort_transaction(global_tid); | |
122 | global_tid = 0; | |
123 | error(0, "detected deadlock, restarting scan"); | |
124 | continue; | |
125 | } else { | |
126 | trackdb_commit_transaction(global_tid); | |
127 | global_tid = 0; | |
128 | break; | |
129 | } | |
130 | } | |
131 | } | |
132 | ||
133 | /** @brief Truncate database @p db */ | |
134 | static void truncate_database(const char *name, DB *db) { | |
135 | u_int32_t count; | |
136 | int err; | |
137 | ||
138 | do { | |
139 | err = db->truncate(db, 0, &count, DB_AUTO_COMMIT); | |
140 | } while(err == DB_LOCK_DEADLOCK); | |
141 | if(err) | |
142 | fatal(0, "error truncating %s: %s", name, db_strerror(err)); | |
143 | } | |
144 | ||
145 | /* scan callbacks */ | |
146 | ||
147 | static int normalize_keys(const char *name, DB *db, DBC *c, | |
148 | DBT *k, DBT *d) { | |
149 | char *knfc; | |
150 | size_t nknfc; | |
151 | int err; | |
152 | ||
153 | /* Find the normalized form of the key */ | |
154 | knfc = utf8_compose_canon(k->data, k->size, &nknfc); | |
155 | if(!knfc) | |
156 | fatal(0, "%s: cannot convert key to NFC: %.*s", name, | |
157 | (int)k->size, (const char *)k->data); | |
158 | /* If the key is already in NFC then do nothing */ | |
159 | if(nknfc == k->size && !memcmp(k->data, knfc, nknfc)) | |
160 | return 0; | |
161 | /* To rename the key we must delete the old one and insert a new one */ | |
162 | if((err = c->c_del(c, 0))) { | |
163 | if(err != DB_LOCK_DEADLOCK) | |
164 | fatal(0, "%s: error removing denormalized key: %s", | |
165 | name, db_strerror(err)); | |
166 | return err; | |
167 | } | |
168 | k->size = nknfc; | |
169 | k->data = knfc; | |
170 | if((err = db->put(db, global_tid, k, d, DB_NOOVERWRITE))) { | |
171 | if(err != DB_LOCK_DEADLOCK) | |
172 | fatal(0, "%s: error storing normalized key: %s", name, db_strerror(err)); | |
173 | return err; | |
174 | } | |
175 | return 0; | |
176 | } | |
177 | ||
178 | static int normalize_values(const char *name, DB *db, | |
179 | DBC attribute((unused)) *c, | |
180 | DBT *k, DBT *d) { | |
181 | char *dnfc; | |
182 | size_t ndnfc; | |
183 | int err; | |
184 | ||
185 | /* Find the normalized form of the value */ | |
186 | dnfc = utf8_compose_canon(d->data, d->size, &ndnfc); | |
187 | if(!dnfc) | |
188 | fatal(0, "%s: cannot convert data to NFC: %.*s", name, | |
189 | (int)d->size, (const char *)d->data); | |
190 | /* If the key is already in NFC then do nothing */ | |
191 | if(ndnfc == d->size && !memcmp(d->data, dnfc, ndnfc)) | |
192 | return 0; | |
193 | d->size = ndnfc; | |
194 | d->data = dnfc; | |
195 | if((err = db->put(db, global_tid, k, d, 0))) { | |
196 | if(err != DB_LOCK_DEADLOCK) | |
197 | fatal(0, "%s: error storing normalized data: %s", name, db_strerror(err)); | |
198 | return err; | |
199 | } | |
200 | return 0; | |
201 | } | |
202 | ||
203 | static int renotice(const char *name, DB attribute((unused)) *db, | |
204 | DBC attribute((unused)) *c, | |
205 | DBT *k, DBT *d) { | |
206 | const struct kvp *const t = kvp_urldecode(d->data, d->size); | |
207 | const char *const track = xstrndup(k->data, k->size); | |
208 | const char *const path = kvp_get(t, "_path"); | |
209 | int err; | |
210 | ||
211 | if(!path) | |
212 | fatal(0, "%s: no '_path' for %.*s", name, | |
213 | (int)k->size, (const char *)k->data); | |
214 | switch(err = trackdb_notice_tid(track, path, global_tid)) { | |
215 | case 0: | |
216 | return 0; | |
217 | case DB_LOCK_DEADLOCK: | |
218 | return err; | |
219 | default: | |
220 | fatal(0, "%s: unexpected return from trackdb_notice_tid: %s", | |
221 | name, db_strerror(err)); | |
222 | } | |
223 | } | |
224 | ||
225 | static int remove_aliases_normalize_keys(const char *name, DB *db, DBC *c, | |
226 | DBT *k, DBT *d) { | |
227 | const struct kvp *const t = kvp_urldecode(d->data, d->size); | |
228 | int err; | |
229 | ||
230 | if(kvp_get(t, "_alias_for")) { | |
231 | /* This is an alias. We remove all the alias entries. */ | |
232 | if((err = c->c_del(c, 0))) { | |
233 | if(err != DB_LOCK_DEADLOCK) | |
234 | fatal(0, "%s: error removing alias: %s", name, db_strerror(err)); | |
235 | return err; | |
236 | } | |
237 | return 0; | |
238 | } | |
239 | return normalize_keys(name, db, c, k, d); | |
240 | } | |
241 | ||
242 | /** @brief Upgrade the database to the current version | |
243 | * | |
244 | * This function is supposed to be idempotent, so if it is interrupted | |
245 | * half way through it is safe to restart. | |
246 | */ | |
247 | static void upgrade(void) { | |
248 | char buf[32]; | |
249 | ||
250 | info("upgrading database to dbversion %ld", config->dbversion); | |
251 | /* Normalize keys and values as required. We will also remove aliases as | |
252 | * they will be regenerated when we re-noticed the tracks. */ | |
253 | info("renormalizing keys"); | |
254 | scan("tracks.db", trackdb_tracksdb, remove_aliases_normalize_keys); | |
255 | scan("prefs.db", trackdb_prefsdb, normalize_keys); | |
256 | scan("global.db", trackdb_globaldb, normalize_keys); | |
257 | scan("noticed.db", trackdb_noticeddb, normalize_values); | |
258 | /* search.db and tags.db we will rebuild */ | |
259 | info("regenerating search database and aliases"); | |
260 | truncate_database("search.db", trackdb_searchdb); | |
261 | truncate_database("tags.db", trackdb_tagsdb); | |
262 | /* Regenerate the search database and aliases */ | |
263 | scan("tracks.db", trackdb_tracksdb, renotice); | |
264 | /* Finally update the database version */ | |
265 | snprintf(buf, sizeof buf, "%ld", config->dbversion); | |
266 | trackdb_set_global("_dbversion", buf, 0); | |
267 | info("completed database upgrade"); | |
268 | } | |
269 | ||
270 | int main(int argc, char **argv) { | |
271 | int n, logsyslog = !isatty(2); | |
272 | ||
273 | set_progname(argv); | |
274 | mem_init(); | |
275 | if(!setlocale(LC_CTYPE, "")) fatal(errno, "error calling setlocale"); | |
276 | while((n = getopt_long(argc, argv, "hVc:dDSs", options, 0)) >= 0) { | |
277 | switch(n) { | |
278 | case 'h': help(); | |
279 | case 'V': version(); | |
280 | case 'c': configfile = optarg; break; | |
281 | case 'd': debugging = 1; break; | |
282 | case 'D': debugging = 0; break; | |
283 | case 'S': logsyslog = 0; break; | |
284 | case 's': logsyslog = 1; break; | |
285 | default: fatal(0, "invalid option"); | |
286 | } | |
287 | } | |
288 | /* If stderr is a TTY then log there, otherwise to syslog. */ | |
289 | if(logsyslog) { | |
290 | openlog(progname, LOG_PID, LOG_DAEMON); | |
291 | log_default = &log_syslog; | |
292 | } | |
293 | if(config_read(0)) fatal(0, "cannot read configuration"); | |
294 | /* Open the database */ | |
295 | trackdb_init(0); | |
296 | trackdb_open(1/*dbupgrade*/); | |
297 | upgrade(); | |
298 | return 0; | |
299 | } | |
300 | ||
301 | /* | |
302 | Local Variables: | |
303 | c-basic-offset:2 | |
304 | comment-column:40 | |
305 | fill-column:79 | |
306 | indent-tabs-mode:nil | |
307 | End: | |
308 | */ |