/*
* $Id$
*
- * Sleepycat (Berkeley) DB driver for Citadel/UX
+ * Sleepycat (Berkeley) DB driver for Citadel
*
*/
+/*****************************************************************************
+ 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
+
+/*****************************************************************************/
+
#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>
+#else
+#error Neither <db.h> nor <db4/db.h> was found by configure. Install db4-devel.
+#endif
+
+
+#if DB_VERSION_MAJOR < 4 || DB_VERSION_MINOR < 1
+#error Citadel requires Berkeley DB v4.1 or newer. Please upgrade.
+#endif
+
+
+#include <pthread.h>
#include "citadel.h"
#include "server.h"
+#include "serv_extensions.h"
#include "citserver.h"
#include "database.h"
+#include "msgbase.h"
#include "sysdep_decls.h"
+#include "config.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;
+
+ ret = tid->abort(tid);
+
+ if (ret) {
+ lprintf(CTDL_EMERG, "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;
+
+ ret = tid->commit(tid, 0);
+
+ if (ret) {
+ lprintf(CTDL_EMERG, "cdb_*: txn_commit: %s\n",
+ db_strerror(ret));
+ abort();
+ }
+}
+
+/* are you sensing a pattern yet? */
+static void txbegin(DB_TXN ** tid)
+{
+ int ret;
+
+ ret = dbenv->txn_begin(dbenv, NULL, tid, 0);
+
+ if (ret) {
+ lprintf(CTDL_EMERG, "cdb_*: txn_begin: %s\n",
+ db_strerror(ret));
+ abort();
+ }
+}
+
+static void dbpanic(DB_ENV * env, int errval)
+{
+ lprintf(CTDL_EMERG, "cdb_*: Berkeley DB panic: %d\n", errval);
+}
+
+static void cclose(DBC * cursor)
+{
+ int ret;
+
+ if ((ret = cursor->c_close(cursor))) {
+ lprintf(CTDL_EMERG, "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(CTDL_EMERG,
+ "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(CTDL_EMERG,
+ "cdb_*: transaction still in progress!");
+ abort();
+ }
+ }
+}
+
+static void dest_tsd(void *arg)
+{
+ if (arg != NULL) {
+ check_handles(arg);
+ free(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 = malloc(sizeof(struct cdbtsd));
+
+ 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[999]; /* FIXME !! */
-#define MYCURSOR cursorz[CC->cs_pid]
/*
* Reclaim unused space in the databases. We need to do each one of
* these discretely, rather than in a loop.
+ *
+ * This is a stub function in the Sleepycat DB backend, because there is no
+ * such API call available.
*/
void defrag_databases(void)
{
- /* FIXME ... do we even need this? If not, we'll just keep it as
- * a stub function to keep the API consistent.
- */
+ /* do nothing */
}
+/*
+ * Cull the database logs
+ */
+static void cdb_cull_logs(void)
+{
+ u_int32_t flags;
+ int ret;
+ char **file, **list;
+ char errmsg[SIZ];
+
+ flags = DB_ARCH_ABS;
+
+ /* Get the list of names. */
+ if ((ret = dbenv->log_archive(dbenv, &list, flags)) != 0) {
+ lprintf(CTDL_ERR, "cdb_cull_logs: %s\n", db_strerror(ret));
+ return;
+ }
+
+ /* Print the list of names. */
+ if (list != NULL) {
+ for (file = list; *file != NULL; ++file) {
+ lprintf(CTDL_DEBUG, "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, "Database Warning Message");
+ }
+ }
+ free(list);
+ }
+}
+
+/*
+ * Manually initiate log file cull.
+ */
+void cmd_cull(char *argbuf) {
+ if (CtdlAccessCheck(ac_internal)) return;
+ cdb_cull_logs();
+ cprintf("%d Database log file cull completed.\n", CIT_OK);
+}
+
+
+/*
+ * Request a checkpoint of the database.
+ */
+static void cdb_checkpoint(void)
+{
+ int ret;
+ static time_t last_run = 0L;
+
+ /* Only do a checkpoint once per minute. */
+ if ((time(NULL) - last_run) < 60L) {
+ return;
+ }
+ last_run = time(NULL);
+
+ lprintf(CTDL_DEBUG, "-- db checkpoint --\n");
+ ret = dbenv->txn_checkpoint(dbenv,
+ MAX_CHECKPOINT_KBYTES,
+ MAX_CHECKPOINT_MINUTES, 0);
+
+ if (ret != 0) {
+ lprintf(CTDL_EMERG, "cdb_checkpoint: txn_checkpoint: %s\n",
+ db_strerror(ret));
+ abort();
+ }
+
+ /* After a successful checkpoint, we can cull the unused logs */
+ if (config.c_auto_cull) {
+ cdb_cull_logs();
+ }
+}
+
+
+/*
+ * Main loop for the checkpoint thread.
+ */
+void *checkpoint_thread(void *arg) {
+ struct CitContext checkpointCC;
+
+ lprintf(CTDL_DEBUG, "checkpoint_thread() initializing\n");
+
+ memset(&checkpointCC, 0, sizeof(struct CitContext));
+ checkpointCC.internal_pgm = 1;
+ checkpointCC.cs_pid = 0;
+ pthread_setspecific(MyConKey, (void *)&checkpointCC );
+
+ cdb_allocate_tsd();
+
+ while (!time_to_die) {
+ cdb_checkpoint();
+ sleep(1);
+ }
+
+ lprintf(CTDL_DEBUG, "checkpoint_thread() exiting\n");
+ pthread_exit(NULL);
+}
+
/*
* 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
- * critical section here, because there aren't any active threads manipulating
- * the database yet -- and besides, it causes problems on BSDI.
+ * does not exist should be created. Note that we don't need a
+ * critical section here, because there aren't any active threads
+ * manipulating the database yet.
*/
void open_databases(void)
{
int ret;
int i;
- char dbfilename[256];
-
- /*
- * Silently try to create the database subdirectory. If it's
- * already there, no problem.
- */
- system("exec mkdir data 2>/dev/null");
+ char dbfilename[SIZ];
+ u_int32_t flags = 0;
+ DIR *dp;
+ struct dirent *d;
+ char filename[PATH_MAX];
+
+ lprintf(CTDL_DEBUG, "cdb_*: open_databases() starting\n");
+ lprintf(CTDL_DEBUG, "Compiled db: %s\n", DB_VERSION_STRING);
+ lprintf(CTDL_INFO, " Linked db: %s\n",
+ db_version(NULL, NULL, NULL));
+#ifdef HAVE_ZLIB
+ lprintf(CTDL_INFO, "Linked zlib: %s\n", zlibVersion());
+#endif
+
+ /*
+ * Silently try to create the database subdirectory. If it's
+ * already there, no problem.
+ */
+ mkdir(ctdl_data_dir, 0700);
+ chmod(ctdl_data_dir, 0700);
+ chown(ctdl_data_dir, CTDLUID, (-1));
- lprintf(9, "Setting up DB environment\n");
+ lprintf(CTDL_DEBUG, "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(CTDL_EMERG, "cdb_*: db_env_create: %s\n",
+ db_strerror(ret));
exit(ret);
}
- dbenv->set_errfile(dbenv, stderr); /* FIXME */
dbenv->set_errpfx(dbenv, "citserver");
+ dbenv->set_paniccall(dbenv, dbpanic);
- /*
- * We want to specify the shared memory buffer pool cachesize,
- * but everything else is the default.
- */
- ret = dbenv->set_cachesize(dbenv, 0, 64 * 1024, 0);
+ /*
+ * We want to specify the shared memory buffer pool cachesize,
+ * but everything else is the default.
+ */
+ ret = dbenv->set_cachesize(dbenv, 0, 64 * 1024, 0);
if (ret) {
- lprintf(1, "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);
+ lprintf(CTDL_EMERG, "cdb_*: set_cachesize: %s\n",
+ db_strerror(ret));
+ dbenv->close(dbenv, 0);
+ exit(ret);
+ }
+
+ if ((ret = dbenv->set_lk_detect(dbenv, DB_LOCK_DEFAULT))) {
+ lprintf(CTDL_EMERG, "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;
+ lprintf(CTDL_DEBUG, "dbenv->open(dbenv, %s, %d, 0)\n", ctdl_data_dir,
+ flags);
+ ret = dbenv->open(dbenv, ctdl_data_dir, flags, 0);
if (ret) {
- lprintf(1, "dbenv->open: %s\n", db_strerror(ret));
- dbenv->close(dbenv, 0);
- exit(ret);
- }
+ lprintf(CTDL_DEBUG, "cdb_*: dbenv->open: %s\n",
+ db_strerror(ret));
+ dbenv->close(dbenv, 0);
+ exit(ret);
+ }
- lprintf(7, "Starting up DB\n");
+ lprintf(CTDL_INFO, "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(CTDL_DEBUG, "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,
- 0600);
+ NULL,
+ dbfilename,
+ NULL,
+ DB_BTREE,
+ DB_CREATE | DB_AUTO_COMMIT | DB_THREAD,
+ 0600);
if (ret) {
- lprintf(1, "db_open[%d]: %s\n", i, db_strerror(ret));
+ lprintf(CTDL_EMERG, "cdb_*: db_open[%d]: %s\n", i,
+ db_strerror(ret));
exit(ret);
}
+ }
+
+ if ((ret = pthread_key_create(&tsdkey, dest_tsd))) {
+ lprintf(CTDL_EMERG, "cdb_*: pthread_key_create: %s\n",
+ strerror(ret));
+ exit(1);
+ }
+
+ cdb_allocate_tsd();
+ /* Now make sure we own all the files, because in a few milliseconds
+ * we're going to drop root privs.
+ */
+ dp = opendir(ctdl_data_dir);
+ if (dp != NULL) {
+ while (d = readdir(dp), d != NULL) {
+ if (d->d_name[0] != '.') {
+ snprintf(filename, sizeof filename,
+ "%s/%s", ctdl_data_dir, d->d_name);
+ chmod(filename, 0600);
+ chown(filename, CTDLUID, (-1));
+ }
+ }
+ closedir(dp);
}
+ lprintf(CTDL_DEBUG, "cdb_*: open_databases() finished\n");
+
+ CtdlRegisterProtoHook(cmd_cull, "CULL", "Cull database logs");
}
/*
- * 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 ((ret = dbenv->txn_checkpoint(dbenv, 0, 0, 0))) {
+ lprintf(CTDL_EMERG,
+ "cdb_*: txn_checkpoint: %s\n", db_strerror(ret));
+ }
+
for (a = 0; a < MAXCDB; ++a) {
- lprintf(7, "Closing database %d\n", a);
+ lprintf(CTDL_INFO, "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(CTDL_EMERG,
+ "cdb_*: db_close: %s\n", db_strerror(ret));
}
-
- }
-
+ }
- /* Close the handle. */
- ret = dbenv->close(dbenv, 0);
+ /* Close the handle. */
+ ret = dbenv->close(dbenv, 0);
if (ret) {
- lprintf(1, "DBENV->close: %s\n", db_strerror(ret));
- }
+ lprintf(CTDL_EMERG,
+ "cdb_*: DBENV->close: %s\n", db_strerror(ret));
+ }
+}
+
+/*
+ * Compression functions only used if we have zlib
+ */
+#ifdef HAVE_ZLIB
- end_critical_section(S_DATABASE);
+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 = malloc(zheader.uncompressed_len);
+
+ if (uncompress((Bytef *) uncompressed_data,
+ (uLongf *) & destLen,
+ (const Bytef *) compressed_data,
+ (uLong) sourceLen) != Z_OK) {
+ lprintf(CTDL_EMERG, "uncompress() error\n");
+ abort();
+ }
+ free(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
* key already exists it should be overwritten.
*/
-int cdb_store(int cdb,
- void *ckey, int ckeylen,
- void *cdata, int cdatalen)
+int cdb_store(int cdb, void *ckey, int ckeylen, void *cdata, int cdatalen)
{
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;
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);
+#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 = malloc(buffer_len);
+ if (compress2((Bytef *) (compressed_data +
+ sizeof(struct
+ CtdlCompressHeader)),
+ &destLen, (Bytef *) cdata, (uLongf) cdatalen,
+ 1) != Z_OK) {
+ lprintf(CTDL_EMERG, "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(CTDL_EMERG, "cdb_store(%d): %s\n", cdb,
+ db_strerror(ret));
+ abort();
+ }
+#ifdef HAVE_ZLIB
+ if (compressing)
+ free(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(CTDL_EMERG, "cdb_store(%d): %s\n",
+ cdb, db_strerror(ret));
+ abort();
+ }
+ } else {
+ txcommit(tid);
+#ifdef HAVE_ZLIB
+ if (compressing)
+ free(compressed_data);
+#endif
+ return ret;
+ }
}
- return (0);
}
{
DBT dkey;
+ DB_TXN *tid;
int ret;
+ memset(&dkey, 0, sizeof dkey);
dkey.size = keylen;
dkey.data = key;
- 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);
-
+ if (MYTID != NULL) {
+ ret = dbp[cdb]->del(dbp[cdb], MYTID, &dkey, 0);
+ if (ret) {
+ lprintf(CTDL_EMERG, "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(CTDL_EMERG, "cdb_delete(%d): %s\n",
+ cdb, db_strerror(ret));
+ abort();
+ }
+ } else {
+ txcommit(tid);
+ }
+ }
+ 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(CTDL_EMERG, "localcursor: %s\n", db_strerror(ret));
+ abort();
+ }
+
+ return curs;
+}
/*
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 (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);
+ }
+ while (ret == DB_LOCK_DEADLOCK);
+
+ }
+
if ((ret != 0) && (ret != DB_NOTFOUND)) {
- lprintf(1, "cdb_fetch: %s\n", db_strerror(ret));
+ lprintf(CTDL_EMERG, "cdb_fetch(%d): %s\n", cdb,
+ db_strerror(ret));
+ abort();
}
- if (ret != 0) return NULL;
- tempcdb = (struct cdbdata *) mallok(sizeof(struct cdbdata));
+
+ if (ret != 0)
+ return NULL;
+ tempcdb = (struct cdbdata *) malloc(sizeof(struct cdbdata));
+
if (tempcdb == NULL) {
- lprintf(2, "Cannot allocate memory!\n");
+ lprintf(CTDL_EMERG,
+ "cdb_fetch: Cannot allocate memory for tempcdb\n");
+ abort();
}
+
tempcdb->len = dret.size;
tempcdb->ptr = dret.data;
+#ifdef HAVE_ZLIB
+ cdb_decompress_if_necessary(tempcdb);
+#endif
return (tempcdb);
}
/*
- * Free a cdbdata item (ok, this is really no big deal, but we might need to do
- * more complex stuff with other database managers in the future).
+ * Free a cdbdata item.
+ *
+ * Note that we only free the 'ptr' portion if it is not NULL. This allows
+ * other code to assume ownership of that memory simply by storing the
+ * pointer elsewhere and then setting 'ptr' to NULL. cdb_free() will then
+ * avoid freeing it.
*/
void cdb_free(struct cdbdata *cdb)
{
- phree(cdb->ptr);
- phree(cdb);
+ if (cdb->ptr) {
+ free(cdb->ptr);
+ }
+ free(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. (In the DB model,
- * use per-session key. There is guaranteed to be no more than one traversal in
- * progress per session at any given time.)
+ * Prepare for a sequential search of an entire database.
+ * (There is guaranteed to be no more than one traversal in
+ * progress per thread at any given time.)
*/
void cdb_rewind(int cdb)
{
int ret = 0;
- begin_critical_section(S_DATABASE);
- ret = dbp[cdb]->cursor(dbp[cdb], NULL, &MYCURSOR, 0);
+ if (MYCURSORS[cdb] != NULL) {
+ lprintf(CTDL_EMERG,
+ "cdb_rewind: must close cursor on database %d before reopening.\n",
+ cdb);
+ abort();
+ /* cclose(MYCURSORS[cdb]); */
+ }
+
+ /*
+ * Now initialize the cursor
+ */
+ ret = dbp[cdb]->cursor(dbp[cdb], MYTID, &MYCURSORS[cdb], 0);
if (ret) {
- lprintf(1, "db_cursor: %s\n", db_strerror(ret));
+ lprintf(CTDL_EMERG, "cdb_rewind: db_cursor: %s\n",
+ db_strerror(ret));
+ abort();
}
- end_critical_section(S_DATABASE);
}
struct cdbdata *cdbret;
int ret = 0;
- /* Initialize the key/data pair so the flags aren't set. */
- memset(&key, 0, sizeof(key));
- memset(&data, 0, sizeof(data));
+ /* Initialize the key/data pair so the flags aren't set. */
+ memset(&key, 0, sizeof(key));
+ 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,
- &key, &data, DB_NEXT);
- lprintf(9, "...returned %d\n", ret);
- end_critical_section(S_DATABASE);
-
- if (ret) return NULL; /* presumably, end of file */
+ ret = MYCURSORS[cdb]->c_get(MYCURSORS[cdb], &key, &data, DB_NEXT);
- cdbret = (struct cdbdata *) mallok(sizeof(struct cdbdata));
+ if (ret) {
+ if (ret != DB_NOTFOUND) {
+ lprintf(CTDL_EMERG, "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 *) malloc(sizeof(struct cdbdata));
cdbret->len = data.size;
cdbret->ptr = data.data;
+#ifdef HAVE_ZLIB
+ cdb_decompress_if_necessary(cdbret);
+#endif
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(CTDL_EMERG,
+ "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(CTDL_WARNING,
+ "cdb_end_transaction: WARNING: cursor %d still open at transaction end\n",
+ i);
+ cclose(MYCURSORS[i]);
+ MYCURSORS[i] = NULL;
+ }
+
+ if (MYTID == NULL) {
+ lprintf(CTDL_EMERG,
+ "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;
+ u_int32_t count;
+
+ if (MYTID != NULL) {
+ lprintf(CTDL_EMERG,
+ "cdb_trunc must not be called in a transaction.\n");
+ abort();
+ } else {
+ bailIfCursor(MYCURSORS,
+ "attempt to write during r/o cursor");
+
+ retry:
+ /* txbegin(&tid); */
+
+ if ((ret = dbp[cdb]->truncate(dbp[cdb], /* db */
+ NULL, /* transaction ID */
+ &count, /* #rows deleted */
+ 0))) { /* flags */
+ if (ret == DB_LOCK_DEADLOCK) {
+ /* txabort(tid); */
+ goto retry;
+ } else {
+ lprintf(CTDL_EMERG,
+ "cdb_truncate(%d): %s\n", cdb,
+ db_strerror(ret));
+ abort();
+ }
+ } else {
+ /* txcommit(tid); */
+ }
+ }
+}
projects / citadel.git / blobdiff