4 * Sleepycat (Berkeley) DB driver for Citadel
8 /*****************************************************************************
9 Tunable configuration parameters for the Sleepycat DB back end
10 *****************************************************************************/
12 /* Citadel will checkpoint the db at the end of every session, but only if
13 * the specified number of kilobytes has been written, or if the specified
14 * number of minutes has passed, since the last checkpoint.
16 #define MAX_CHECKPOINT_KBYTES 256
17 #define MAX_CHECKPOINT_MINUTES 15
19 /*****************************************************************************/
28 #include <sys/types.h>
34 #elif defined(HAVE_DB4_DB_H)
37 #error Neither <db.h> nor <db4/db.h> was found by configure. Install db4-devel.
41 #if DB_VERSION_MAJOR < 4 || DB_VERSION_MINOR < 1
42 #error Citadel requires Berkeley DB v4.1 or newer. Please upgrade.
46 #include <libcitadel.h>
49 #include "citserver.h"
52 #include "sysdep_decls.h"
56 #include "ctdl_module.h"
59 static DB *dbp[MAXCDB]; /* One DB handle for each Citadel database */
60 static DB_ENV *dbenv; /* The DB environment (global) */
68 /* Verbose logging callback */
69 void cdb_verbose_log(const DB_ENV *dbenv, const char *msg)
71 CtdlLogPrintf(CTDL_DEBUG, "BDB: %s\n", msg);
75 /* Verbose logging callback */
76 void cdb_verbose_err(const DB_ENV *dbenv, const char *errpfx, const char *msg)
78 CtdlLogPrintf(CTDL_ALERT, "BDB: %s\n", msg);
82 /* just a little helper function */
83 static void txabort(DB_TXN * tid)
87 ret = tid->abort(tid);
90 CtdlLogPrintf(CTDL_EMERG, "cdb_*: txn_abort: %s\n",
96 /* this one is even more helpful than the last. */
97 static void txcommit(DB_TXN * tid)
101 ret = tid->commit(tid, 0);
104 CtdlLogPrintf(CTDL_EMERG, "cdb_*: txn_commit: %s\n",
110 /* are you sensing a pattern yet? */
111 static void txbegin(DB_TXN ** tid)
115 ret = dbenv->txn_begin(dbenv, NULL, tid, 0);
118 CtdlLogPrintf(CTDL_EMERG, "cdb_*: txn_begin: %s\n",
124 static void dbpanic(DB_ENV * env, int errval)
126 CtdlLogPrintf(CTDL_EMERG, "cdb_*: Berkeley DB panic: %d\n", errval);
129 static void cclose(DBC * cursor)
133 if ((ret = cursor->c_close(cursor))) {
134 CtdlLogPrintf(CTDL_EMERG, "cdb_*: c_close: %s\n",
140 static void bailIfCursor(DBC ** cursors, const char *msg)
144 for (i = 0; i < MAXCDB; i++)
145 if (cursors[i] != NULL) {
146 CtdlLogPrintf(CTDL_EMERG,
147 "cdb_*: cursor still in progress on cdb %d: %s\n",
153 void check_handles(void *arg)
156 ThreadTSD *tsd = (ThreadTSD *) arg;
158 bailIfCursor(tsd->cursors, "in check_handles");
160 if (tsd->tid != NULL) {
161 CtdlLogPrintf(CTDL_EMERG,
162 "cdb_*: transaction still in progress!");
168 void cdb_check_handles(void)
170 check_handles(pthread_getspecific(ThreadKey));
175 * Cull the database logs
177 static void cdb_cull_logs(void)
186 /* Get the list of names. */
187 if ((ret = dbenv->log_archive(dbenv, &list, flags)) != 0) {
188 CtdlLogPrintf(CTDL_ERR, "cdb_cull_logs: %s\n", db_strerror(ret));
192 /* Print the list of names. */
194 for (file = list; *file != NULL; ++file) {
195 CtdlLogPrintf(CTDL_DEBUG, "Deleting log: %s\n", *file);
198 snprintf(errmsg, sizeof(errmsg),
199 " ** ERROR **\n \n \n "
200 "Citadel was unable to delete the "
201 "database log file '%s' because of the "
202 "following error:\n \n %s\n \n"
203 " This log file is no longer in use "
204 "and may be safely deleted.\n",
205 *file, strerror(errno));
206 aide_message(errmsg, "Database Warning Message");
214 * Manually initiate log file cull.
216 void cmd_cull(char *argbuf) {
217 if (CtdlAccessCheck(ac_internal)) return;
219 cprintf("%d Database log file cull completed.\n", CIT_OK);
224 * Request a checkpoint of the database.
226 void cdb_checkpoint(void)
229 // static time_t last_run = 0L;
231 /* Only do a checkpoint once per minute. */
233 * Don't need this any more, since the thread that calls us sleeps for 60 seconds between calls
235 if ((time(NULL) - last_run) < 60L) {
238 last_run = time(NULL);
241 CtdlLogPrintf(CTDL_DEBUG, "-- db checkpoint --\n");
242 ret = dbenv->txn_checkpoint(dbenv,
243 MAX_CHECKPOINT_KBYTES,
244 MAX_CHECKPOINT_MINUTES, 0);
247 CtdlLogPrintf(CTDL_EMERG, "cdb_checkpoint: txn_checkpoint: %s\n",
252 /* After a successful checkpoint, we can cull the unused logs */
253 if (config.c_auto_cull) {
261 * Open the various databases we'll be using. Any database which
262 * does not exist should be created. Note that we don't need a
263 * critical section here, because there aren't any active threads
264 * manipulating the database yet.
266 void open_databases(void)
270 char dbfilename[SIZ];
273 CtdlLogPrintf(CTDL_DEBUG, "cdb_*: open_databases() starting\n");
274 CtdlLogPrintf(CTDL_DEBUG, "Compiled db: %s\n", DB_VERSION_STRING);
275 CtdlLogPrintf(CTDL_INFO, " Linked db: %s\n",
276 db_version(NULL, NULL, NULL));
278 CtdlLogPrintf(CTDL_INFO, "Linked zlib: %s\n", zlibVersion());
282 * Silently try to create the database subdirectory. If it's
283 * already there, no problem.
285 mkdir(ctdl_data_dir, 0700);
286 chmod(ctdl_data_dir, 0700);
287 chown(ctdl_data_dir, CTDLUID, (-1));
289 CtdlLogPrintf(CTDL_DEBUG, "cdb_*: Setting up DB environment\n");
290 db_env_set_func_yield(sched_yield);
291 ret = db_env_create(&dbenv, 0);
293 CtdlLogPrintf(CTDL_EMERG, "cdb_*: db_env_create: %s\n",
297 dbenv->set_errpfx(dbenv, "citserver");
298 dbenv->set_paniccall(dbenv, dbpanic);
299 dbenv->set_errcall(dbenv, cdb_verbose_err);
300 dbenv->set_errpfx(dbenv, "ctdl");
301 #if (DB_VERSION_MAJOR == 4) && (DB_VERSION_MINOR >= 3)
302 dbenv->set_msgcall(dbenv, cdb_verbose_log);
304 dbenv->set_verbose(dbenv, DB_VERB_DEADLOCK, 1);
305 dbenv->set_verbose(dbenv, DB_VERB_RECOVERY, 1);
308 * We want to specify the shared memory buffer pool cachesize,
309 * but everything else is the default.
311 ret = dbenv->set_cachesize(dbenv, 0, 64 * 1024, 0);
313 CtdlLogPrintf(CTDL_EMERG, "cdb_*: set_cachesize: %s\n",
315 dbenv->close(dbenv, 0);
319 if ((ret = dbenv->set_lk_detect(dbenv, DB_LOCK_DEFAULT))) {
320 CtdlLogPrintf(CTDL_EMERG, "cdb_*: set_lk_detect: %s\n",
322 dbenv->close(dbenv, 0);
326 flags = DB_CREATE | DB_INIT_MPOOL | DB_PRIVATE | DB_INIT_TXN | DB_INIT_LOCK | DB_THREAD | DB_RECOVER;
327 CtdlLogPrintf(CTDL_DEBUG, "dbenv->open(dbenv, %s, %d, 0)\n", ctdl_data_dir, flags);
328 ret = dbenv->open(dbenv, ctdl_data_dir, flags, 0);
329 if (ret == DB_RUNRECOVERY) {
330 CtdlLogPrintf(CTDL_ALERT, "dbenv->open: %s\n", db_strerror(ret));
331 CtdlLogPrintf(CTDL_ALERT, "Attempting recovery...\n");
333 ret = dbenv->open(dbenv, ctdl_data_dir, flags, 0);
335 if (ret == DB_RUNRECOVERY) {
336 CtdlLogPrintf(CTDL_ALERT, "dbenv->open: %s\n", db_strerror(ret));
337 CtdlLogPrintf(CTDL_ALERT, "Attempting catastrophic recovery...\n");
338 flags &= ~DB_RECOVER;
339 flags |= DB_RECOVER_FATAL;
340 ret = dbenv->open(dbenv, ctdl_data_dir, flags, 0);
343 CtdlLogPrintf(CTDL_DEBUG, "dbenv->open: %s\n", db_strerror(ret));
344 dbenv->close(dbenv, 0);
348 CtdlLogPrintf(CTDL_INFO, "Starting up DB\n");
350 for (i = 0; i < MAXCDB; ++i) {
352 /* Create a database handle */
353 ret = db_create(&dbp[i], dbenv, 0);
355 CtdlLogPrintf(CTDL_DEBUG, "db_create: %s\n",
361 /* Arbitrary names for our tables -- we reference them by
362 * number, so we don't have string names for them.
364 snprintf(dbfilename, sizeof dbfilename, "cdb.%02x", i);
366 ret = dbp[i]->open(dbp[i],
371 DB_CREATE | DB_AUTO_COMMIT | DB_THREAD,
374 CtdlLogPrintf(CTDL_EMERG, "db_open[%d]: %s\n", i,
383 /* Make sure we own all the files, because in a few milliseconds
384 * we're going to drop root privs.
386 void cdb_chmod_data(void) {
389 char filename[PATH_MAX];
391 dp = opendir(ctdl_data_dir);
393 while (d = readdir(dp), d != NULL) {
394 if (d->d_name[0] != '.') {
395 snprintf(filename, sizeof filename,
396 "%s/%s", ctdl_data_dir, d->d_name);
397 CtdlLogPrintf(9, "chmod(%s, 0600) returned %d\n",
398 filename, chmod(filename, 0600)
400 CtdlLogPrintf(9, "chown(%s, CTDLUID, -1) returned %d\n",
401 filename, chown(filename, CTDLUID, (-1))
408 CtdlLogPrintf(CTDL_DEBUG, "open_databases() finished\n");
410 CtdlRegisterProtoHook(cmd_cull, "CULL", "Cull database logs");
415 * Close all of the db database files we've opened. This can be done
416 * in a loop, since it's just a bunch of closes.
418 void close_databases(void)
423 ctdl_thread_internal_free_tsd();
425 if ((ret = dbenv->txn_checkpoint(dbenv, 0, 0, 0))) {
426 CtdlLogPrintf(CTDL_EMERG,
427 "txn_checkpoint: %s\n", db_strerror(ret));
430 /* print some statistics... */
432 dbenv->lock_stat_print(dbenv, DB_STAT_ALL);
435 /* close the tables */
436 for (a = 0; a < MAXCDB; ++a) {
437 CtdlLogPrintf(CTDL_INFO, "Closing database %d\n", a);
438 ret = dbp[a]->close(dbp[a], 0);
440 CtdlLogPrintf(CTDL_EMERG,
441 "db_close: %s\n", db_strerror(ret));
446 /* Close the handle. */
447 ret = dbenv->close(dbenv, 0);
449 CtdlLogPrintf(CTDL_EMERG,
450 "DBENV->close: %s\n", db_strerror(ret));
456 * Compression functions only used if we have zlib
460 void cdb_decompress_if_necessary(struct cdbdata *cdb)
462 static int magic = COMPRESS_MAGIC;
463 struct CtdlCompressHeader zheader;
464 char *uncompressed_data;
465 char *compressed_data;
466 uLongf destLen, sourceLen;
470 if (cdb->ptr == NULL)
472 if (memcmp(cdb->ptr, &magic, sizeof(magic)))
475 /* At this point we know we're looking at a compressed item. */
476 memcpy(&zheader, cdb->ptr, sizeof(struct CtdlCompressHeader));
478 compressed_data = cdb->ptr;
479 compressed_data += sizeof(struct CtdlCompressHeader);
481 sourceLen = (uLongf) zheader.compressed_len;
482 destLen = (uLongf) zheader.uncompressed_len;
483 uncompressed_data = malloc(zheader.uncompressed_len);
485 if (uncompress((Bytef *) uncompressed_data,
486 (uLongf *) & destLen,
487 (const Bytef *) compressed_data,
488 (uLong) sourceLen) != Z_OK) {
489 CtdlLogPrintf(CTDL_EMERG, "uncompress() error\n");
494 cdb->len = (size_t) destLen;
495 cdb->ptr = uncompressed_data;
498 #endif /* HAVE_ZLIB */
502 * Store a piece of data. Returns 0 if the operation was successful. If a
503 * key already exists it should be overwritten.
505 int cdb_store(int cdb, void *ckey, int ckeylen, void *cdata, int cdatalen)
513 struct CtdlCompressHeader zheader;
514 char *compressed_data = NULL;
516 size_t buffer_len = 0;
520 memset(&dkey, 0, sizeof(DBT));
521 memset(&ddata, 0, sizeof(DBT));
524 ddata.size = cdatalen;
528 /* Only compress Visit records. Everything else is uncompressed. */
529 if (cdb == CDB_VISIT) {
531 zheader.magic = COMPRESS_MAGIC;
532 zheader.uncompressed_len = cdatalen;
533 buffer_len = ((cdatalen * 101) / 100) + 100
534 + sizeof(struct CtdlCompressHeader);
535 destLen = (uLongf) buffer_len;
536 compressed_data = malloc(buffer_len);
537 if (compress2((Bytef *) (compressed_data +
539 CtdlCompressHeader)),
540 &destLen, (Bytef *) cdata, (uLongf) cdatalen,
542 CtdlLogPrintf(CTDL_EMERG, "compress2() error\n");
545 zheader.compressed_len = (size_t) destLen;
546 memcpy(compressed_data, &zheader,
547 sizeof(struct CtdlCompressHeader));
548 ddata.size = (size_t) (sizeof(struct CtdlCompressHeader) +
549 zheader.compressed_len);
550 ddata.data = compressed_data;
555 ret = dbp[cdb]->put(dbp[cdb], /* db */
556 MYTID, /* transaction ID */
561 CtdlLogPrintf(CTDL_EMERG, "cdb_store(%d): %s\n", cdb,
567 free(compressed_data);
572 bailIfCursor(MYCURSORS,
573 "attempt to write during r/o cursor");
578 if ((ret = dbp[cdb]->put(dbp[cdb], /* db */
579 tid, /* transaction ID */
583 if (ret == DB_LOCK_DEADLOCK) {
587 CtdlLogPrintf(CTDL_EMERG, "cdb_store(%d): %s\n",
588 cdb, db_strerror(ret));
595 free(compressed_data);
604 * Delete a piece of data. Returns 0 if the operation was successful.
606 int cdb_delete(int cdb, void *key, int keylen)
613 memset(&dkey, 0, sizeof dkey);
618 ret = dbp[cdb]->del(dbp[cdb], MYTID, &dkey, 0);
620 CtdlLogPrintf(CTDL_EMERG, "cdb_delete(%d): %s\n", cdb,
622 if (ret != DB_NOTFOUND)
626 bailIfCursor(MYCURSORS,
627 "attempt to delete during r/o cursor");
632 if ((ret = dbp[cdb]->del(dbp[cdb], tid, &dkey, 0))
633 && ret != DB_NOTFOUND) {
634 if (ret == DB_LOCK_DEADLOCK) {
638 CtdlLogPrintf(CTDL_EMERG, "cdb_delete(%d): %s\n",
639 cdb, db_strerror(ret));
649 static DBC *localcursor(int cdb)
654 if (MYCURSORS[cdb] == NULL)
655 ret = dbp[cdb]->cursor(dbp[cdb], MYTID, &curs, 0);
658 MYCURSORS[cdb]->c_dup(MYCURSORS[cdb], &curs,
662 CtdlLogPrintf(CTDL_EMERG, "localcursor: %s\n", db_strerror(ret));
671 * Fetch a piece of data. If not found, returns NULL. Otherwise, it returns
672 * a struct cdbdata which it is the caller's responsibility to free later on
673 * using the cdb_free() routine.
675 struct cdbdata *cdb_fetch(int cdb, void *key, int keylen)
678 struct cdbdata *tempcdb;
682 memset(&dkey, 0, sizeof(DBT));
687 memset(&dret, 0, sizeof(DBT));
688 dret.flags = DB_DBT_MALLOC;
689 ret = dbp[cdb]->get(dbp[cdb], MYTID, &dkey, &dret, 0);
694 memset(&dret, 0, sizeof(DBT));
695 dret.flags = DB_DBT_MALLOC;
697 curs = localcursor(cdb);
699 ret = curs->c_get(curs, &dkey, &dret, DB_SET);
702 while (ret == DB_LOCK_DEADLOCK);
706 if ((ret != 0) && (ret != DB_NOTFOUND)) {
707 CtdlLogPrintf(CTDL_EMERG, "cdb_fetch(%d): %s\n", cdb,
714 tempcdb = (struct cdbdata *) malloc(sizeof(struct cdbdata));
716 if (tempcdb == NULL) {
717 CtdlLogPrintf(CTDL_EMERG,
718 "cdb_fetch: Cannot allocate memory for tempcdb\n");
722 tempcdb->len = dret.size;
723 tempcdb->ptr = dret.data;
725 cdb_decompress_if_necessary(tempcdb);
732 * Free a cdbdata item.
734 * Note that we only free the 'ptr' portion if it is not NULL. This allows
735 * other code to assume ownership of that memory simply by storing the
736 * pointer elsewhere and then setting 'ptr' to NULL. cdb_free() will then
739 void cdb_free(struct cdbdata *cdb)
747 void cdb_close_cursor(int cdb)
749 if (MYCURSORS[cdb] != NULL)
750 cclose(MYCURSORS[cdb]);
752 MYCURSORS[cdb] = NULL;
756 * Prepare for a sequential search of an entire database.
757 * (There is guaranteed to be no more than one traversal in
758 * progress per thread at any given time.)
760 void cdb_rewind(int cdb)
764 if (MYCURSORS[cdb] != NULL) {
765 CtdlLogPrintf(CTDL_EMERG,
766 "cdb_rewind: must close cursor on database %d before reopening.\n",
769 /* cclose(MYCURSORS[cdb]); */
773 * Now initialize the cursor
775 ret = dbp[cdb]->cursor(dbp[cdb], MYTID, &MYCURSORS[cdb], 0);
777 CtdlLogPrintf(CTDL_EMERG, "cdb_rewind: db_cursor: %s\n",
785 * Fetch the next item in a sequential search. Returns a pointer to a
786 * cdbdata structure, or NULL if we've hit the end.
788 struct cdbdata *cdb_next_item(int cdb)
791 struct cdbdata *cdbret;
794 /* Initialize the key/data pair so the flags aren't set. */
795 memset(&key, 0, sizeof(key));
796 memset(&data, 0, sizeof(data));
797 data.flags = DB_DBT_MALLOC;
799 ret = MYCURSORS[cdb]->c_get(MYCURSORS[cdb], &key, &data, DB_NEXT);
802 if (ret != DB_NOTFOUND) {
803 CtdlLogPrintf(CTDL_EMERG, "cdb_next_item(%d): %s\n",
804 cdb, db_strerror(ret));
807 cclose(MYCURSORS[cdb]);
808 MYCURSORS[cdb] = NULL;
809 return NULL; /* presumably, end of file */
812 cdbret = (struct cdbdata *) malloc(sizeof(struct cdbdata));
813 cdbret->len = data.size;
814 cdbret->ptr = data.data;
816 cdb_decompress_if_necessary(cdbret);
825 * Transaction-based stuff. I'm writing this as I bake cookies...
828 void cdb_begin_transaction(void)
831 bailIfCursor(MYCURSORS,
832 "can't begin transaction during r/o cursor");
835 CtdlLogPrintf(CTDL_EMERG,
836 "cdb_begin_transaction: ERROR: nested transaction\n");
843 void cdb_end_transaction(void)
847 for (i = 0; i < MAXCDB; i++)
848 if (MYCURSORS[i] != NULL) {
849 CtdlLogPrintf(CTDL_WARNING,
850 "cdb_end_transaction: WARNING: cursor %d still open at transaction end\n",
852 cclose(MYCURSORS[i]);
857 CtdlLogPrintf(CTDL_EMERG,
858 "cdb_end_transaction: ERROR: txcommit(NULL) !!\n");
867 * Truncate (delete every record)
869 void cdb_trunc(int cdb)
876 CtdlLogPrintf(CTDL_EMERG,
877 "cdb_trunc must not be called in a transaction.\n");
880 bailIfCursor(MYCURSORS,
881 "attempt to write during r/o cursor");
886 if ((ret = dbp[cdb]->truncate(dbp[cdb], /* db */
887 NULL, /* transaction ID */
888 &count, /* #rows deleted */
890 if (ret == DB_LOCK_DEADLOCK) {
894 CtdlLogPrintf(CTDL_EMERG,
895 "cdb_truncate(%d): %s\n", cdb,