*
*/
+/*****************************************************************************
+ Tunable configuration parameters for the Sleepycat DB back end
+ *****************************************************************************/
+
+/* Citadel will checkpoint the db at the end of every session, but only if
+ * the specified number of kilobytes has been written, or if the specified
+ * number of minutes has passed, since the last checkpoint.
+ */
+#define MAX_CHECKPOINT_KBYTES 256
+#define MAX_CHECKPOINT_MINUTES 15
+
+/*****************************************************************************/
+
+#ifdef DLL_EXPORT
+#define IN_LIBCIT
+#endif
+
#include "sysdep.h"
#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
-#include <time.h>
#include <ctype.h>
#include <string.h>
#include <errno.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <dirent.h>
+
+#ifdef HAVE_DB_H
#include <db.h>
+#elif defined(HAVE_DB4_DB_H)
+#include <db4/db.h>
+#elif defined(HAVE_DB3_DB_H)
+#include <db3/db.h>
+#else
+#error Neither <db.h> nor <db3/db.h> was found by configure. Install db3-devel.
+#endif
+
+#include <pthread.h>
#include "citadel.h"
#include "server.h"
+#include "dynloader.h"
#include "citserver.h"
#include "database.h"
+#include "msgbase.h"
#include "sysdep_decls.h"
+static DB *dbp[MAXCDB]; /* One DB handle for each Citadel database */
+static DB_ENV *dbenv; /* The DB environment (global) */
+
+struct cdbtsd { /* Thread-specific DB stuff */
+ DB_TXN *tid; /* Transaction handle */
+ DBC *cursors[MAXCDB]; /* Cursors, for traversals... */
+};
+
+#ifdef HAVE_ZLIB
+#include <zlib.h>
+#endif
+
+static pthread_key_t tsdkey;
+
+#define MYCURSORS (((struct cdbtsd*)pthread_getspecific(tsdkey))->cursors)
+#define MYTID (((struct cdbtsd*)pthread_getspecific(tsdkey))->tid)
+
+/* just a little helper function */
+static void txabort(DB_TXN *tid) {
+ int ret = txn_abort(tid);
+
+ if (ret) {
+ lprintf(1, "cdb_*: txn_abort: %s\n", db_strerror(ret));
+ abort();
+ }
+}
+
+/* this one is even more helpful than the last. */
+static void txcommit(DB_TXN *tid) {
+ int ret = txn_commit(tid, 0);
+
+ if (ret) {
+ lprintf(1, "cdb_*: txn_commit: %s\n", db_strerror(ret));
+ abort();
+ }
+}
+
+/* are you sensing a pattern yet? */
+static void txbegin(DB_TXN **tid) {
+ int ret = txn_begin(dbenv, NULL, tid, 0);
+
+ if (ret) {
+ lprintf(1, "cdb_*: txn_begin: %s\n", db_strerror(ret));
+ abort();
+ }
+}
+
+static void cclose(DBC *cursor) {
+ int ret;
+
+ if ((ret = cursor->c_close(cursor))) {
+ lprintf(1, "cdb_*: c_close: %s\n", db_strerror(ret));
+ abort();
+ }
+}
+
+static void bailIfCursor(DBC **cursors, const char *msg)
+{
+ int i;
+
+ for (i = 0; i < MAXCDB; i++)
+ if (cursors[i] != NULL)
+ {
+ lprintf(1, "cdb_*: cursor still in progress on cdb %d: %s\n", i, msg);
+ abort();
+ }
+}
+
+static void check_handles(void *arg) {
+ if (arg != NULL) {
+ struct cdbtsd *tsd = (struct cdbtsd *)arg;
+
+ bailIfCursor(tsd->cursors, "in check_handles");
+
+ if (tsd->tid != NULL) {
+ lprintf(1, "cdb_*: transaction still in progress!");
+ abort();
+ }
+ }
+}
+
+static void dest_tsd(void *arg) {
+ if (arg != NULL) {
+ check_handles(arg);
+ phree(arg);
+ }
+}
/*
- * This array holds one DB handle for each Citadel database.
+ * Ensure that we have a key for thread-specific data. We don't
+ * put anything in here that Citadel cares about; this is just database
+ * related stuff like cursors and transactions.
+ *
+ * This should be called immediately after startup by any thread which wants
+ * to use database calls, except for whatever thread calls open_databases.
*/
-DB *dbp[MAXCDB];
+void cdb_allocate_tsd(void) {
+ struct cdbtsd *tsd;
+
+ if (pthread_getspecific(tsdkey) != NULL)
+ return;
+
+ tsd = mallok(sizeof *tsd);
+
+ tsd->tid = NULL;
+
+ memset(tsd->cursors, 0, sizeof tsd->cursors);
+ pthread_setspecific(tsdkey, tsd);
+}
-DB_ENV *dbenv;
+void cdb_free_tsd(void) {
+ dest_tsd(pthread_getspecific(tsdkey));
+ pthread_setspecific(tsdkey, NULL);
+}
+
+void cdb_check_handles(void) {
+ check_handles(pthread_getspecific(tsdkey));
+}
-DBC **cursorz = NULL;
-int num_cursorz = 0;
-#define MYCURSOR cursorz[CC->cs_pid]
/*
* Reclaim unused space in the databases. We need to do each one of
}
+/*
+ * Cull the database logs
+ */
+static void cdb_cull_logs(void) {
+ u_int32_t flags;
+ int ret;
+ char **file, **list;
+ char errmsg[SIZ];
+
+ lprintf(5, "Database log file cull started.\n");
+
+ flags = DB_ARCH_ABS;
+
+ /* Get the list of names. */
+#if DB_VERSION_MAJOR == 3 && DB_VERSION_MINOR < 3
+ if ((ret = log_archive(dbenv, &list, flags, NULL)) != 0) {
+#elif DB_VERSION_MAJOR >= 4
+ if ((ret = dbenv->log_archive(dbenv, &list, flags)) != 0) {
+#else
+ if ((ret = log_archive(dbenv, &list, flags)) != 0) {
+#endif
+ lprintf(1, "cdb_cull_logs: %s\n", db_strerror(ret));
+ return;
+ }
+
+ /* Print the list of names. */
+ if (list != NULL) {
+ for (file = list; *file != NULL; ++file) {
+ lprintf(9, "Deleting log: %s\n", *file);
+ ret = unlink(*file);
+ if (ret != 0) {
+ snprintf(errmsg, sizeof(errmsg),
+ " ** ERROR **\n \n \n "
+ "Citadel was unable to delete the "
+ "database log file '%s' because of the "
+ "following error:\n \n %s\n \n"
+ " This log file is no longer in use "
+ "and may be safely deleted.\n",
+ *file,
+ strerror(errno));
+ aide_message(errmsg);
+ }
+ }
+ free(list);
+ }
+
+ lprintf(5, "Database log file cull ended.\n");
+}
+
+
+/*
+ * Request a checkpoint of the database.
+ */
+static void cdb_checkpoint(void) {
+ int ret;
+ static time_t last_cull = 0L;
+
+#if DB_VERSION_MAJOR >= 4
+ ret = dbenv->txn_checkpoint(dbenv,
+#else
+ ret = txn_checkpoint(dbenv,
+#endif
+ MAX_CHECKPOINT_KBYTES,
+ MAX_CHECKPOINT_MINUTES,
+ 0);
+ if ( (ret != 0) && (ret != DB_INCOMPLETE) ) {
+ lprintf(1, "cdb_checkpoint: txn_checkpoint: %s\n", db_strerror(ret));
+ abort();
+ }
+
+ if (ret == DB_INCOMPLETE) {
+ lprintf(3, "WARNING: txn_checkpoint: %s\n", db_strerror(ret));
+ }
+
+ /* Cull the logs if we haven't done so for 24 hours */
+ if ((time(NULL) - last_cull) > 86400L) {
+ last_cull = time(NULL);
+ cdb_cull_logs();
+ }
+
+}
+
/*
* Open the various databases we'll be using. Any database which
* does not exist should be created. Note that we don't need an S_DATABASE
{
int ret;
int i;
- char dbfilename[256];
+ char dbfilename[SIZ];
+ u_int32_t flags = 0;
+
+ lprintf(9, "cdb_*: open_databases() starting\n");
+#ifdef HAVE_ZLIB
+ lprintf(5, "zlib compression version %s\n", zlibVersion());
+#endif
/*
* Silently try to create the database subdirectory. If it's
*/
system("exec mkdir data 2>/dev/null");
- lprintf(9, "Setting up DB environment\n");
+ lprintf(9, "cdb_*: Setting up DB environment\n");
+ db_env_set_func_yield(sched_yield);
ret = db_env_create(&dbenv, 0);
if (ret) {
- lprintf(1, "db_env_create: %s\n", db_strerror(ret));
+ lprintf(1, "cdb_*: db_env_create: %s\n", db_strerror(ret));
exit(ret);
}
dbenv->set_errpfx(dbenv, "citserver");
*/
ret = dbenv->set_cachesize(dbenv, 0, 64 * 1024, 0);
if (ret) {
- lprintf(1, "set_cachesize: %s\n", db_strerror(ret));
+ lprintf(1, "cdb_*: set_cachesize: %s\n", db_strerror(ret));
dbenv->close(dbenv, 0);
exit(ret);
}
- /*
- * We have multiple processes reading/writing these files, so
- * we need concurrency control and a shared buffer pool, but
- * not logging or transactions.
- */
- /* (void)dbenv->set_data_dir(dbenv, "/database/files"); */
- ret = dbenv->open(dbenv, "./data",
- ( DB_CREATE | DB_INIT_MPOOL ),
- 0);
+ if ((ret = dbenv->set_lk_detect(dbenv, DB_LOCK_DEFAULT))) {
+ lprintf(1, "cdb_*: set_lk_detect: %s\n", db_strerror(ret));
+ dbenv->close(dbenv, 0);
+ exit(ret);
+ }
+
+ flags = DB_CREATE|DB_RECOVER|DB_INIT_MPOOL|DB_PRIVATE|DB_INIT_TXN|
+ DB_INIT_LOCK|DB_THREAD;
+ ret = dbenv->open(dbenv, "./data", flags, 0);
if (ret) {
- lprintf(1, "dbenv->open: %s\n", db_strerror(ret));
+ lprintf(1, "cdb_*: dbenv->open: %s\n", db_strerror(ret));
dbenv->close(dbenv, 0);
exit(ret);
}
- lprintf(7, "Starting up DB\n");
+ lprintf(7, "cdb_*: Starting up DB\n");
for (i = 0; i < MAXCDB; ++i) {
/* Create a database handle */
ret = db_create(&dbp[i], dbenv, 0);
if (ret) {
- lprintf(1, "db_create: %s\n", db_strerror(ret));
+ lprintf(1, "cdb_*: db_create: %s\n", db_strerror(ret));
exit(ret);
}
/* Arbitrary names for our tables -- we reference them by
* number, so we don't have string names for them.
*/
- sprintf(dbfilename, "cdb.%02x", i);
+ snprintf(dbfilename, sizeof dbfilename, "cdb.%02x", i);
ret = dbp[i]->open(dbp[i],
dbfilename,
NULL,
DB_BTREE,
- DB_CREATE,
+ DB_CREATE|DB_THREAD,
0600);
if (ret) {
- lprintf(1, "db_open[%d]: %s\n", i, db_strerror(ret));
+ lprintf(1, "cdb_*: db_open[%d]: %s\n", i, db_strerror(ret));
exit(ret);
}
+ }
+ if ((ret = pthread_key_create(&tsdkey, dest_tsd))) {
+ lprintf(1, "cdb_*: pthread_key_create: %s\n", strerror(ret));
+ exit(1);
}
+ cdb_allocate_tsd();
+ CtdlRegisterSessionHook(cdb_checkpoint, EVT_TIMER);
+ lprintf(9, "cdb_*: open_databases() finished\n");
}
/*
- * Close all of the gdbm database files we've opened. This can be done
+ * Close all of the db database files we've opened. This can be done
* in a loop, since it's just a bunch of closes.
*/
void close_databases(void)
int a;
int ret;
- begin_critical_section(S_DATABASE);
+ cdb_free_tsd();
+
+#if DB_VERSION_MAJOR >= 4
+ if ((ret = dbenv->txn_checkpoint(dbenv, 0, 0, 0))) {
+#else
+ if ((ret = txn_checkpoint(dbenv, 0, 0, 0))) {
+#endif
+ lprintf(1, "cdb_*: txn_checkpoint: %s\n", db_strerror(ret));
+ abort();
+ }
+
for (a = 0; a < MAXCDB; ++a) {
- lprintf(7, "Closing database %d\n", a);
+ lprintf(7, "cdb_*: Closing database %d\n", a);
ret = dbp[a]->close(dbp[a], 0);
if (ret) {
- lprintf(1, "db_close: %s\n", db_strerror(ret));
+ lprintf(1, "cdb_*: db_close: %s\n", db_strerror(ret));
+ abort();
}
}
-
-
/* Close the handle. */
ret = dbenv->close(dbenv, 0);
if (ret) {
- lprintf(1, "DBENV->close: %s\n", db_strerror(ret));
+ lprintf(1, "cdb_*: DBENV->close: %s\n", db_strerror(ret));
+ abort();
}
+}
- end_critical_section(S_DATABASE);
+/*
+ * Compression functions only used if we have zlib
+ */
+#ifdef HAVE_ZLIB
+
+void cdb_decompress_if_necessary(struct cdbdata *cdb) {
+ static int magic = COMPRESS_MAGIC;
+ struct CtdlCompressHeader zheader;
+ char *uncompressed_data;
+ char *compressed_data;
+ uLongf destLen, sourceLen;
+
+ if (cdb == NULL) return;
+ if (cdb->ptr == NULL) return;
+ if (memcmp(cdb->ptr, &magic, sizeof(magic))) return;
+
+ /* At this point we know we're looking at a compressed item. */
+ memcpy(&zheader, cdb->ptr, sizeof(struct CtdlCompressHeader));
+
+ compressed_data = cdb->ptr;
+ compressed_data += sizeof(struct CtdlCompressHeader);
+
+ sourceLen = (uLongf) zheader.compressed_len;
+ destLen = (uLongf) zheader.uncompressed_len;
+ uncompressed_data = mallok(zheader.uncompressed_len);
+
+ if (uncompress( (Bytef *) uncompressed_data,
+ &destLen,
+ compressed_data,
+ sourceLen
+ ) != Z_OK) {
+ lprintf(1, "uncompress() error\n");
+ abort();
+ }
+ phree(cdb->ptr);
+ cdb->len = (size_t) destLen;
+ cdb->ptr = uncompressed_data;
}
+#endif /* HAVE_ZLIB */
+
/*
* Store a piece of data. Returns 0 if the operation was successful. If a
void *cdata, int cdatalen)
{
- DBT dkey, ddata;
- int ret;
-
- memset(&dkey, 0, sizeof(DBT));
- memset(&ddata, 0, sizeof(DBT));
- dkey.size = ckeylen;
- dkey.data = ckey;
- ddata.size = cdatalen;
- ddata.data = cdata;
-
- begin_critical_section(S_DATABASE);
- lprintf(9, "cdb_store(%d) ...\n", cdb);
- ret = dbp[cdb]->put(dbp[cdb], /* db */
- NULL, /* transaction ID (hmm...) */
- &dkey, /* key */
- &ddata, /* data */
- 0); /* flags */
- end_critical_section(S_DATABASE);
- lprintf(9, "...put ( to file %d) returned %3d (%d bytes)\n",
- cdb, ret, ddata.size);
- if (ret) {
- lprintf(1, "cdb_store: %s\n", db_strerror(ret));
- return (-1);
+ DBT dkey, ddata;
+ DB_TXN *tid;
+ int ret;
+
+#ifdef HAVE_ZLIB
+ struct CtdlCompressHeader zheader;
+ char *compressed_data = NULL;
+ int compressing = 0;
+ size_t buffer_len;
+ uLongf destLen;
+#endif
+
+ memset(&dkey, 0, sizeof(DBT));
+ memset(&ddata, 0, sizeof(DBT));
+ dkey.size = ckeylen;
+ dkey.data = ckey;
+ ddata.size = cdatalen;
+ ddata.data = cdata;
+
+#ifdef HAVE_ZLIB
+ /* Only compress Visit records. Everything else is uncompressed. */
+ if (cdb == CDB_VISIT) {
+ compressing = 1;
+ zheader.magic = COMPRESS_MAGIC;
+ zheader.uncompressed_len = cdatalen;
+ buffer_len = ( (cdatalen * 101) / 100 ) + 100
+ + sizeof(struct CtdlCompressHeader) ;
+ destLen = (uLongf) buffer_len;
+ compressed_data = mallok(buffer_len);
+ if (compress2(
+ (Bytef *) (compressed_data +
+ sizeof(struct CtdlCompressHeader)),
+ &destLen,
+ (Bytef *) cdata,
+ (uLongf) cdatalen,
+ 1
+ ) != Z_OK) {
+ lprintf(1, "compress2() error\n");
+ abort();
+ }
+ zheader.compressed_len = (size_t) destLen;
+ memcpy(compressed_data, &zheader,
+ sizeof(struct CtdlCompressHeader));
+ ddata.size = (size_t) (sizeof(struct CtdlCompressHeader) +
+ zheader.compressed_len);
+ ddata.data = compressed_data;
+ }
+#endif
+
+ if (MYTID != NULL)
+ {
+ ret = dbp[cdb]->put(dbp[cdb], /* db */
+ MYTID, /* transaction ID */
+ &dkey, /* key */
+ &ddata, /* data */
+ 0); /* flags */
+ if (ret)
+ {
+ lprintf(1, "cdb_store(%d): %s\n", cdb,
+ db_strerror(ret));
+ abort();
+ }
+#ifdef HAVE_ZLIB
+ if (compressing) phree(compressed_data);
+#endif
+ return ret;
+
+ }
+ else
+ {
+ bailIfCursor(MYCURSORS, "attempt to write during r/o cursor");
+
+ retry:
+ txbegin(&tid);
+
+ if ((ret = dbp[cdb]->put(dbp[cdb], /* db */
+ tid, /* transaction ID */
+ &dkey, /* key */
+ &ddata, /* data */
+ 0))) /* flags */
+ {
+ if (ret == DB_LOCK_DEADLOCK)
+ {
+ txabort(tid);
+ goto retry;
+ }
+ else
+ {
+ lprintf(1, "cdb_store(%d): %s\n", cdb,
+ db_strerror(ret));
+ abort();
+ }
+ }
+ else
+ {
+ txcommit(tid);
+#ifdef HAVE_ZLIB
+ if (compressing) phree(compressed_data);
+#endif
+ return ret;
}
- return (0);
+ }
}
int cdb_delete(int cdb, void *key, int keylen)
{
- DBT dkey;
- int ret;
-
- dkey.size = keylen;
- dkey.data = key;
+ DBT dkey;
+ DB_TXN *tid;
+ int ret;
+
+ memset(&dkey, 0, sizeof dkey);
+ dkey.size = keylen;
+ dkey.data = key;
+
+ if (MYTID != NULL)
+ {
+ ret = dbp[cdb]->del(dbp[cdb], MYTID, &dkey, 0);
+ if (ret)
+ {
+ lprintf(1, "cdb_delete(%d): %s\n", cdb,
+ db_strerror(ret));
+ if (ret != DB_NOTFOUND)
+ abort();
+ }
+ }
+ else
+ {
+ bailIfCursor(MYCURSORS, "attempt to delete during r/o cursor");
+
+ retry:
+ txbegin(&tid);
+
+ if ((ret = dbp[cdb]->del(dbp[cdb], tid, &dkey, 0))
+ && ret != DB_NOTFOUND)
+ {
+ if (ret == DB_LOCK_DEADLOCK)
+ {
+ txabort(tid);
+ goto retry;
+ }
+ else
+ {
+ lprintf(1, "cdb_delete(%d): %s\n", cdb,
+ db_strerror(ret));
+ abort();
+ }
+ }
+ else
+ {
+ txcommit(tid);
+ }
+ }
+ return ret;
+}
- begin_critical_section(S_DATABASE);
- lprintf(9, "cdb_delete(%d) ...\n", cdb);
- ret = dbp[cdb]->del(dbp[cdb], NULL, &dkey, 0);
- lprintf(9, "cdb_delete returned %d\n", ret);
- end_critical_section(S_DATABASE);
- return (ret);
+static DBC *localcursor(int cdb)
+{
+ int ret;
+ DBC *curs;
-}
+ if (MYCURSORS[cdb] == NULL)
+ ret = dbp[cdb]->cursor(dbp[cdb], MYTID, &curs, 0);
+ else
+ ret = MYCURSORS[cdb]->c_dup(MYCURSORS[cdb], &curs, DB_POSITION);
+ if (ret)
+ {
+ lprintf(1, "localcursor: %s\n", db_strerror(ret));
+ abort();
+ }
+ return curs;
+}
/*
struct cdbdata *cdb_fetch(int cdb, void *key, int keylen)
{
- struct cdbdata *tempcdb;
- DBT dkey, dret;
- int ret;
-
- memset(&dkey, 0, sizeof(DBT));
- memset(&dret, 0, sizeof(DBT));
- dkey.size = keylen;
- dkey.data = key;
- dret.flags = DB_DBT_MALLOC;
-
- begin_critical_section(S_DATABASE);
- lprintf(9, "cdb_fetch(%d) ...\n", cdb);
- ret = dbp[cdb]->get(dbp[cdb], NULL, &dkey, &dret, 0);
- end_critical_section(S_DATABASE);
- lprintf(9, "get (from file %d) returned %3d (%d bytes)\n",
- cdb, ret, dret.size);
- if ((ret != 0) && (ret != DB_NOTFOUND)) {
- lprintf(1, "cdb_fetch: %s\n", db_strerror(ret));
+ struct cdbdata *tempcdb;
+ DBT dkey, dret;
+ int ret;
+
+ memset(&dkey, 0, sizeof(DBT));
+ dkey.size = keylen;
+ dkey.data = key;
+
+ if (MYTID != NULL)
+ {
+ memset(&dret, 0, sizeof(DBT));
+ dret.flags = DB_DBT_MALLOC;
+ ret = dbp[cdb]->get(dbp[cdb], MYTID, &dkey, &dret, 0);
+ }
+ else
+ {
+ DBC *curs;
+
+ do
+ {
+ memset(&dret, 0, sizeof(DBT));
+ dret.flags = DB_DBT_MALLOC;
+
+ curs = localcursor(cdb);
+
+ ret = curs->c_get(curs, &dkey, &dret, DB_SET);
+ cclose(curs);
}
- if (ret != 0) return NULL;
- tempcdb = (struct cdbdata *) mallok(sizeof(struct cdbdata));
- if (tempcdb == NULL) {
- lprintf(2, "Cannot allocate memory!\n");
- }
- tempcdb->len = dret.size;
- tempcdb->ptr = dret.data;
- return (tempcdb);
+ while (ret == DB_LOCK_DEADLOCK);
+
+ }
+
+ if ((ret != 0) && (ret != DB_NOTFOUND))
+ {
+ lprintf(1, "cdb_fetch(%d): %s\n", cdb, db_strerror(ret));
+ abort();
+ }
+
+ if (ret != 0) return NULL;
+ tempcdb = (struct cdbdata *) mallok(sizeof(struct cdbdata));
+
+ if (tempcdb == NULL)
+ {
+ lprintf(2, "cdb_fetch: Cannot allocate memory for tempcdb\n");
+ abort();
+ }
+
+ tempcdb->len = dret.size;
+ tempcdb->ptr = dret.data;
+ cdb_decompress_if_necessary(tempcdb);
+ return (tempcdb);
}
phree(cdb);
}
+void cdb_close_cursor(int cdb)
+{
+ if (MYCURSORS[cdb] != NULL)
+ cclose(MYCURSORS[cdb]);
+
+ MYCURSORS[cdb] = NULL;
+}
/*
* Prepare for a sequential search of an entire database.
* (There is guaranteed to be no more than one traversal in
- * progress per session at any given time.)
+ * progress per thread at any given time.)
*/
void cdb_rewind(int cdb)
{
int ret = 0;
- /*
- * Make sure we have a cursor allocated for this session
- */
-
- if (num_cursorz <= CC->cs_pid) {
- num_cursorz = CC->cs_pid + 1;
- if (cursorz == NULL) {
- cursorz = (DBC **)
- mallok((sizeof(DBC *) * num_cursorz));
- } else {
- cursorz = (DBC **)
- reallok(cursorz, (sizeof(DBC *) * num_cursorz));
- }
- }
-
+ if (MYCURSORS[cdb] != NULL)
+ cclose(MYCURSORS[cdb]);
/*
* Now initialize the cursor
*/
- begin_critical_section(S_DATABASE);
- ret = dbp[cdb]->cursor(dbp[cdb], NULL, &MYCURSOR, 0);
+ ret = dbp[cdb]->cursor(dbp[cdb], MYTID, &MYCURSORS[cdb], 0);
if (ret) {
- lprintf(1, "db_cursor: %s\n", db_strerror(ret));
+ lprintf(1, "cdb_rewind: db_cursor: %s\n", db_strerror(ret));
+ abort();
}
- end_critical_section(S_DATABASE);
}
memset(&data, 0, sizeof(data));
data.flags = DB_DBT_MALLOC;
- begin_critical_section(S_DATABASE);
- lprintf(9, "cdb_next_item(%d)...\n", cdb);
- ret = MYCURSOR->c_get(MYCURSOR,
+ ret = MYCURSORS[cdb]->c_get(MYCURSORS[cdb],
&key, &data, DB_NEXT);
- lprintf(9, "...returned %d\n", ret);
- end_critical_section(S_DATABASE);
- if (ret) return NULL; /* presumably, end of file */
+ if (ret) {
+ if (ret != DB_NOTFOUND) {
+ lprintf(1, "cdb_next_item(%d): %s\n",
+ cdb, db_strerror(ret));
+ abort();
+ }
+ cclose(MYCURSORS[cdb]);
+ MYCURSORS[cdb] = NULL;
+ return NULL; /* presumably, end of file */
+ }
cdbret = (struct cdbdata *) mallok(sizeof(struct cdbdata));
cdbret->len = data.size;
cdbret->ptr = data.data;
+ cdb_decompress_if_necessary(cdbret);
return (cdbret);
}
+
+
+
+/*
+ * Transaction-based stuff. I'm writing this as I bake cookies...
+ */
+
+void cdb_begin_transaction(void) {
+
+ bailIfCursor(MYCURSORS, "can't begin transaction during r/o cursor");
+
+ if (MYTID != NULL)
+ {
+ lprintf(1, "cdb_begin_transaction: ERROR: nested transaction\n");
+ abort();
+ }
+
+ txbegin(&MYTID);
+}
+
+void cdb_end_transaction(void) {
+ int i;
+
+ for (i = 0; i < MAXCDB; i++)
+ if (MYCURSORS[i] != NULL) {
+ lprintf(1, "cdb_end_transaction: WARNING: cursor %d still open at transaction end\n", i);
+ cclose(MYCURSORS[i]);
+ MYCURSORS[i] = NULL;
+ }
+
+ if (MYTID == NULL)
+ {
+ lprintf(1, "cdb_end_transaction: ERROR: txcommit(NULL) !!\n");
+ abort();
+ }
+ else
+ txcommit(MYTID);
+
+ MYTID = NULL;
+}
+
+/*
+ * Truncate (delete every record)
+ */
+void cdb_trunc(int cdb)
+{
+ DB_TXN *tid;
+ int ret;
+#if DB_VERSION_MAJOR > 3 || DB_VERSION_MINOR > 2
+ u_int32_t count;
+#endif
+
+ if (MYTID != NULL)
+ {
+ lprintf(1, "cdb_trunc must not be called in a transaction.\n");
+ abort();
+ }
+ else
+ {
+ bailIfCursor(MYCURSORS, "attempt to write during r/o cursor");
+
+#if DB_VERSION_MAJOR == 3 && DB_VERSION_MINOR < 3
+ for (;;)
+ {
+ DBT key, data;
+
+ /* Initialize the key/data pair so the flags aren't set. */
+ memset(&key, 0, sizeof(key));
+ memset(&data, 0, sizeof(data));
+
+ txbegin(&tid);
+
+ ret = dbp[cdb]->cursor(dbp[cdb], tid, &MYCURSORS[cdb], 0);
+ if (ret)
+ {
+ lprintf(1, "cdb_trunc: db_cursor: %s\n", db_strerror(ret));
+ abort();
+ }
+
+ ret = MYCURSORS[cdb]->c_get(MYCURSORS[cdb],
+ &key, &data, DB_NEXT);
+ if (ret)
+ {
+ cclose(MYCURSORS[cdb]);
+ txabort(tid);
+ if (ret == DB_LOCK_DEADLOCK)
+ continue;
+
+ if (ret == DB_NOTFOUND)
+ break;
+
+ lprintf(1, "cdb_trunc: c_get: %s\n", db_strerror(ret));
+ abort();
+ }
+
+ ret = MYCURSORS[cdb]->c_del(MYCURSORS[cdb], 0);
+ if (ret)
+ {
+ cclose(MYCURSORS[cdb]);
+ txabort(tid);
+ if (ret == DB_LOCK_DEADLOCK)
+ continue;
+
+ lprintf(1, "cdb_trunc: c_del: %s\n", db_strerror(ret));
+ abort();
+ }
+
+ cclose(MYCURSORS[cdb]);
+ txcommit(tid);
+ }
+#else
+ retry:
+ txbegin(&tid);
+
+ if ((ret = dbp[cdb]->truncate(dbp[cdb], /* db */
+ tid, /* transaction ID */
+ &count, /* #rows deleted */
+ 0))) /* flags */
+ {
+ if (ret == DB_LOCK_DEADLOCK)
+ {
+ txabort(tid);
+ goto retry;
+ }
+ else
+ {
+ lprintf(1, "cdb_truncate(%d): %s\n", cdb,
+ db_strerror(ret));
+ abort();
+ }
+ }
+ else
+ {
+ txcommit(tid);
+ }
+#endif
+ }
+}
projects / citadel.git / blobdiff