X-Git-Url: https://code.citadel.org/?a=blobdiff_plain;f=citadel%2Fdatabase.c;fp=citadel%2Fdatabase.c;h=0000000000000000000000000000000000000000;hb=f6fcf350671e3661f8f22696eb35133014ab6a14;hp=45b5d27342f5c066083aa19876d723b9c605ed62;hpb=2e4e67a1f7f65568abace99d13a71024ad06ebde;p=citadel.git

diff --git a/citadel/database.c b/citadel/database.c
deleted file mode 100644
index 45b5d2734..000000000
--- a/citadel/database.c
+++ /dev/null
@@ -1,812 +0,0 @@
-// This is a data store backend for the Citadel server which uses Berkeley DB.
-//
-// Copyright (c) 1987-2021 by the citadel.org team
-//
-// This program is open source software; you can redistribute it and/or
-// modify it under the terms of the GNU General Public License version 3.
-//
-// This program is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-// GNU General Public License for more details.
-
-/*****************************************************************************
-       Tunable configuration parameters for the Berkeley 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 <sys/stat.h>
-#include <stdio.h>
-#include <dirent.h>
-#include <zlib.h>
-#include <db.h>
-
-#if DB_VERSION_MAJOR < 5
-#error Citadel requires Berkeley DB v5.0 or newer.  Please upgrade.
-#endif
-
-#include <libcitadel.h>
-#include "ctdl_module.h"
-#include "control.h"
-#include "citserver.h"
-#include "config.h"
-
-static DB *dbp[MAXCDB];		/* One DB handle for each Citadel database */
-static DB_ENV *dbenv;		/* The DB environment (global) */
-
-
-void cdb_abort(void) {
-	syslog(LOG_DEBUG, "db: citserver is stopping in order to prevent data loss. uid=%d gid=%d euid=%d egid=%d",
-		getuid(), getgid(), geteuid(), getegid()
-	);
-	exit(CTDLEXIT_DB);
-}
-
-
-/* Verbose logging callback */
-void cdb_verbose_log(const DB_ENV * dbenv, const char *msg) {
-	if (!IsEmptyStr(msg)) {
-		syslog(LOG_DEBUG, "db: %s", msg);
-	}
-}
-
-
-/* Verbose logging callback */
-void cdb_verbose_err(const DB_ENV * dbenv, const char *errpfx, const char *msg) {
-	syslog(LOG_ERR, "db: %s", msg);
-}
-
-
-/* wrapper for txn_abort() that logs/aborts on error */
-static void txabort(DB_TXN *tid) {
-	int ret;
-
-	ret = tid->abort(tid);
-
-	if (ret) {
-		syslog(LOG_ERR, "db: txn_abort: %s", db_strerror(ret));
-		cdb_abort();
-	}
-}
-
-
-/* wrapper for txn_commit() that logs/aborts on error */
-static void txcommit(DB_TXN *tid) {
-	int ret;
-
-	ret = tid->commit(tid, 0);
-
-	if (ret) {
-		syslog(LOG_ERR, "db: txn_commit: %s", db_strerror(ret));
-		cdb_abort();
-	}
-}
-
-
-/* wrapper for txn_begin() that logs/aborts on error */
-static void txbegin(DB_TXN **tid) {
-	int ret;
-
-	ret = dbenv->txn_begin(dbenv, NULL, tid, 0);
-
-	if (ret) {
-		syslog(LOG_ERR, "db: txn_begin: %s", db_strerror(ret));
-		cdb_abort();
-	}
-}
-
-
-/* panic callback */
-static void dbpanic(DB_ENV * env, int errval) {
-	syslog(LOG_ERR, "db: PANIC: %s", db_strerror(errval));
-}
-
-
-static void cclose(DBC * cursor) {
-	int ret;
-
-	if ((ret = cursor->c_close(cursor))) {
-		syslog(LOG_ERR, "db: c_close: %s", db_strerror(ret));
-		cdb_abort();
-	}
-}
-
-
-static void bailIfCursor(DBC ** cursors, const char *msg) {
-	int i;
-
-	for (i = 0; i < MAXCDB; i++)
-		if (cursors[i] != NULL) {
-			syslog(LOG_ERR, "db: cursor still in progress on cdb %02x: %s", i, msg);
-			cdb_abort();
-		}
-}
-
-
-void cdb_check_handles(void) {
-	bailIfCursor(TSD->cursors, "in check_handles");
-
-	if (TSD->tid != NULL) {
-		syslog(LOG_ERR, "db: transaction still in progress!");
-		cdb_abort();
-	}
-}
-
-
-/*
- * Request a checkpoint of the database.  Called once per minute by the thread manager.
- */
-void cdb_checkpoint(void) {
-	int ret;
-
-	syslog(LOG_DEBUG, "db: -- checkpoint --");
-	ret = dbenv->txn_checkpoint(dbenv, MAX_CHECKPOINT_KBYTES, MAX_CHECKPOINT_MINUTES, 0);
-
-	if (ret != 0) {
-		syslog(LOG_ERR, "db: cdb_checkpoint() txn_checkpoint: %s", db_strerror(ret));
-		cdb_abort();
-	}
-
-	/* After a successful checkpoint, we can cull the unused logs */
-	if (CtdlGetConfigInt("c_auto_cull")) {
-		ret = dbenv->log_set_config(dbenv, DB_LOG_AUTO_REMOVE, 1);
-	}
-	else {
-		ret = dbenv->log_set_config(dbenv, DB_LOG_AUTO_REMOVE, 0);
-	}
-}
-
-
-/*
- * Open the various databases we'll be using.  Any database which
- * 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[32];
-	u_int32_t flags = 0;
-	int dbversion_major, dbversion_minor, dbversion_patch;
-
-	syslog(LOG_DEBUG, "db: open_databases() starting");
-	syslog(LOG_DEBUG, "db: Compiled libdb: %s", DB_VERSION_STRING);
-	syslog(LOG_DEBUG, "db:   Linked libdb: %s", db_version(&dbversion_major, &dbversion_minor, &dbversion_patch));
-	syslog(LOG_DEBUG, "db:    Linked zlib: %s", zlibVersion());
-
-	/*
-	 * Silently try to create the database subdirectory.  If it's already there, no problem.
-	 */
-	if ((mkdir(ctdl_db_dir, 0700) != 0) && (errno != EEXIST)) {
-		syslog(LOG_ERR, "db: unable to create database directory [%s]: %m", ctdl_db_dir);
-	}
-	if (chmod(ctdl_db_dir, 0700) != 0) {
-		syslog(LOG_ERR, "db: unable to set database directory permissions [%s]: %m", ctdl_db_dir);
-	}
-	if (chown(ctdl_db_dir, CTDLUID, (-1)) != 0) {
-		syslog(LOG_ERR, "db: unable to set the owner for [%s]: %m", ctdl_db_dir);
-	}
-	syslog(LOG_DEBUG, "db: Setting up DB environment");
-	// db_env_set_func_yield((int (*)(u_long,  u_long))sched_yield);
-	ret = db_env_create(&dbenv, 0);
-	if (ret) {
-		syslog(LOG_ERR, "db: db_env_create: %s", db_strerror(ret));
-		syslog(LOG_ERR, "db: exit code %d", ret);
-		exit(CTDLEXIT_DB);
-	}
-	dbenv->set_errpfx(dbenv, "citserver");
-	dbenv->set_paniccall(dbenv, dbpanic);
-	dbenv->set_errcall(dbenv, cdb_verbose_err);
-	dbenv->set_errpfx(dbenv, "ctdl");
-	dbenv->set_msgcall(dbenv, cdb_verbose_log);
-	dbenv->set_verbose(dbenv, DB_VERB_DEADLOCK, 1);
-	dbenv->set_verbose(dbenv, DB_VERB_RECOVERY, 1);
-
-	/*
-	 * 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) {
-		syslog(LOG_ERR, "db: set_cachesize: %s", db_strerror(ret));
-		dbenv->close(dbenv, 0);
-		syslog(LOG_ERR, "db: exit code %d", ret);
-		exit(CTDLEXIT_DB);
-	}
-
-	if ((ret = dbenv->set_lk_detect(dbenv, DB_LOCK_DEFAULT))) {
-		syslog(LOG_ERR, "db: set_lk_detect: %s", db_strerror(ret));
-		dbenv->close(dbenv, 0);
-		syslog(LOG_ERR, "db: exit code %d", ret);
-		exit(CTDLEXIT_DB);
-	}
-
-	flags = DB_CREATE | DB_INIT_MPOOL | DB_PRIVATE | DB_INIT_TXN | DB_INIT_LOCK | DB_THREAD | DB_INIT_LOG;
-	syslog(LOG_DEBUG, "db: dbenv->open(dbenv, %s, %d, 0)", ctdl_db_dir, flags);
-	ret = dbenv->open(dbenv, ctdl_db_dir, flags, 0);				// try opening the database cleanly
-	if (ret == DB_RUNRECOVERY) {
-		syslog(LOG_ERR, "db: dbenv->open: %s", db_strerror(ret));
-		syslog(LOG_ERR, "db: attempting recovery...");
-		flags |= DB_RECOVER;
-		ret = dbenv->open(dbenv, ctdl_db_dir, flags, 0);			// try recovery
-	}
-	if (ret == DB_RUNRECOVERY) {
-		syslog(LOG_ERR, "db: dbenv->open: %s", db_strerror(ret));
-		syslog(LOG_ERR, "db: attempting catastrophic recovery...");
-		flags &= ~DB_RECOVER;
-		flags |= DB_RECOVER_FATAL;
-		ret = dbenv->open(dbenv, ctdl_db_dir, flags, 0);			// try catastrophic recovery
-	}
-	if (ret) {
-		syslog(LOG_ERR, "db: dbenv->open: %s", db_strerror(ret));
-		dbenv->close(dbenv, 0);
-		syslog(LOG_ERR, "db: exit code %d", ret);
-		exit(CTDLEXIT_DB);
-	}
-
-	syslog(LOG_INFO, "db: mounting databases");
-	for (i = 0; i < MAXCDB; ++i) {
-		ret = db_create(&dbp[i], dbenv, 0);					// Create a database handle
-		if (ret) {
-			syslog(LOG_ERR, "db: db_create: %s", db_strerror(ret));
-			syslog(LOG_ERR, "db: exit code %d", ret);
-			exit(CTDLEXIT_DB);
-		}
-
-		snprintf(dbfilename, sizeof dbfilename, "cdb.%02x", i);			// table names by number
-		ret = dbp[i]->open(dbp[i], NULL, dbfilename, NULL, DB_BTREE, DB_CREATE | DB_AUTO_COMMIT | DB_THREAD, 0600);
-		if (ret) {
-			syslog(LOG_ERR, "db: db_open[%02x]: %s", i, db_strerror(ret));
-			if (ret == ENOMEM) {
-				syslog(LOG_ERR, "db: You may need to tune your database; please read http://www.citadel.org/doku.php?id=faq:troubleshooting:out_of_lock_entries for more information.");
-			}
-			syslog(LOG_ERR, "db: exit code %d", ret);
-			exit(CTDLEXIT_DB);
-		}
-	}
-}
-
-
-/*
- * Make sure we own all the files, because in a few milliseconds we're going to drop root privs.
- */
-void cdb_chmod_data(void) {
-	DIR *dp;
-	struct dirent *d;
-	char filename[PATH_MAX];
-
-	dp = opendir(ctdl_db_dir);
-	if (dp != NULL) {
-		while (d = readdir(dp), d != NULL) {
-			if (d->d_name[0] != '.') {
-				snprintf(filename, sizeof filename, "%s/%s", ctdl_db_dir, d->d_name);
-				syslog(LOG_DEBUG, "db: chmod(%s, 0600) returned %d", filename, chmod(filename, 0600));
-				syslog(LOG_DEBUG, "db: chown(%s, CTDLUID, -1) returned %d",
-					filename, chown(filename, CTDLUID, (-1))
-				);
-			}
-		}
-		closedir(dp);
-	}
-}
-
-
-/*
- * 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 i;
-	int ret;
-
-	syslog(LOG_INFO, "db: performing final checkpoint");
-	if ((ret = dbenv->txn_checkpoint(dbenv, 0, 0, 0))) {
-		syslog(LOG_ERR, "db: txn_checkpoint: %s", db_strerror(ret));
-	}
-
-	syslog(LOG_INFO, "db: flushing the database logs");
-	if ((ret = dbenv->log_flush(dbenv, NULL))) {
-		syslog(LOG_ERR, "db: log_flush: %s", db_strerror(ret));
-	}
-
-	/* close the tables */
-	syslog(LOG_INFO, "db: closing databases");
-	for (i = 0; i < MAXCDB; ++i) {
-		syslog(LOG_INFO, "db: closing database %02x", i);
-		ret = dbp[i]->close(dbp[i], 0);
-		if (ret) {
-			syslog(LOG_ERR, "db: db_close: %s", db_strerror(ret));
-		}
-
-	}
-
-	// This seemed nifty at the time but did anyone really look at it?
-	// #ifdef DB_STAT_ALL
-	// /* print some statistics... */
-	// dbenv->lock_stat_print(dbenv, DB_STAT_ALL);
-	// #endif
-
-	/* Close the handle. */
-	ret = dbenv->close(dbenv, 0);
-	if (ret) {
-		syslog(LOG_ERR, "db: DBENV->close: %s", db_strerror(ret));
-	}
-}
-
-
-/*
- * Decompress a database item if it was compressed on disk
- */
-void cdb_decompress_if_necessary(struct cdbdata *cdb) {
-	static int magic = COMPRESS_MAGIC;
-
-	if ((cdb == NULL) || (cdb->ptr == NULL) || (cdb->len < sizeof(magic)) || (memcmp(cdb->ptr, &magic, sizeof(magic)))) {
-		return;
-	}
-
-	/* At this point we know we're looking at a compressed item. */
-
-	struct CtdlCompressHeader zheader;
-	char *uncompressed_data;
-	char *compressed_data;
-	uLongf destLen, sourceLen;
-	size_t cplen;
-
-	memset(&zheader, 0, sizeof(struct CtdlCompressHeader));
-	cplen = sizeof(struct CtdlCompressHeader);
-	if (sizeof(struct CtdlCompressHeader) > cdb->len) {
-		cplen = cdb->len;
-	}
-	memcpy(&zheader, cdb->ptr, cplen);
-
-	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) {
-		syslog(LOG_ERR, "db: uncompress() error");
-		cdb_abort();
-	}
-
-	free(cdb->ptr);
-	cdb->len = (size_t) destLen;
-	cdb->ptr = uncompressed_data;
-}
-
-
-/*
- * 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, const void *ckey, int ckeylen, void *cdata, int cdatalen) {
-
-	DBT dkey, ddata;
-	DB_TXN *tid = NULL;
-	int ret = 0;
-	struct CtdlCompressHeader zheader;
-	char *compressed_data = NULL;
-	int compressing = 0;
-	size_t buffer_len = 0;
-	uLongf destLen = 0;
-
-	memset(&dkey, 0, sizeof(DBT));
-	memset(&ddata, 0, sizeof(DBT));
-	dkey.size = ckeylen;
-	dkey.data = (void *) ckey;
-	ddata.size = cdatalen;
-	ddata.data = cdata;
-
-	/* Only compress Visit and UseTable records.  Everything else is uncompressed. */
-	if ((cdb == CDB_VISIT) || (cdb == CDB_USETABLE)) {
-		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) {
-			syslog(LOG_ERR, "db: compress2() error");
-			cdb_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;
-	}
-
-	if (TSD->tid != NULL) {
-		ret = dbp[cdb]->put(dbp[cdb],	// db
-				    TSD->tid,	// transaction ID
-				    &dkey,	// key
-				    &ddata,	// data
-				    0		// flags
-		);
-		if (ret) {
-			syslog(LOG_ERR, "db: cdb_store(%d): %s", cdb, db_strerror(ret));
-			cdb_abort();
-		}
-		if (compressing) {
-			free(compressed_data);
-		}
-		return ret;
-	} else {
-		bailIfCursor(TSD->cursors, "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 {
-				syslog(LOG_ERR, "db: cdb_store(%d): %s", cdb, db_strerror(ret));
-				cdb_abort();
-			}
-		} else {
-			txcommit(tid);
-			if (compressing) {
-				free(compressed_data);
-			}
-			return ret;
-		}
-	}
-	return ret;
-}
-
-
-/*
- * Delete a piece of data.  Returns 0 if the operation was successful.
- */
-int cdb_delete(int cdb, void *key, int keylen) {
-	DBT dkey;
-	DB_TXN *tid;
-	int ret;
-
-	memset(&dkey, 0, sizeof dkey);
-	dkey.size = keylen;
-	dkey.data = key;
-
-	if (TSD->tid != NULL) {
-		ret = dbp[cdb]->del(dbp[cdb], TSD->tid, &dkey, 0);
-		if (ret) {
-			syslog(LOG_ERR, "db: cdb_delete(%d): %s", cdb, db_strerror(ret));
-			if (ret != DB_NOTFOUND) {
-				cdb_abort();
-			}
-		}
-	} else {
-		bailIfCursor(TSD->cursors, "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 {
-				syslog(LOG_ERR, "db: cdb_delete(%d): %s", cdb, db_strerror(ret));
-				cdb_abort();
-			}
-		} else {
-			txcommit(tid);
-		}
-	}
-	return ret;
-}
-
-
-static DBC *localcursor(int cdb) {
-	int ret;
-	DBC *curs;
-
-	if (TSD->cursors[cdb] == NULL) {
-		ret = dbp[cdb]->cursor(dbp[cdb], TSD->tid, &curs, 0);
-	}
-	else {
-		ret = TSD->cursors[cdb]->c_dup(TSD->cursors[cdb], &curs, DB_POSITION);
-	}
-
-	if (ret) {
-		syslog(LOG_ERR, "db: localcursor: %s", db_strerror(ret));
-		cdb_abort();
-	}
-
-	return curs;
-}
-
-
-/*
- * Fetch a piece of data.  If not found, returns NULL.  Otherwise, it returns
- * a struct cdbdata which it is the caller's responsibility to free later on
- * using the cdb_free() routine.
- */
-struct cdbdata *cdb_fetch(int cdb, const void *key, int keylen) {
-
-	if (keylen == 0) {		// key length zero is impossible
-		return(NULL);
-	}
-
-	struct cdbdata *tempcdb;
-	DBT dkey, dret;
-	int ret;
-
-	memset(&dkey, 0, sizeof(DBT));
-	dkey.size = keylen;
-	dkey.data = (void *) key;
-
-	if (TSD->tid != NULL) {
-		memset(&dret, 0, sizeof(DBT));
-		dret.flags = DB_DBT_MALLOC;
-		ret = dbp[cdb]->get(dbp[cdb], TSD->tid, &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)) {
-		syslog(LOG_ERR, "db: cdb_fetch(%d): %s", cdb, db_strerror(ret));
-		cdb_abort();
-	}
-
-	if (ret != 0) {
-		return NULL;
-	}
-
-	tempcdb = (struct cdbdata *) malloc(sizeof(struct cdbdata));
-	if (tempcdb == NULL) {
-		syslog(LOG_ERR, "db: cdb_fetch() cannot allocate memory for tempcdb: %m");
-		cdb_abort();
-		return NULL;	/* make it easier for static analysis... */
-	}
-	else {
-		tempcdb->len = dret.size;
-		tempcdb->ptr = dret.data;
-		cdb_decompress_if_necessary(tempcdb);
-		return (tempcdb);
-	}
-}
-
-
-/*
- * 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) {
-	if (cdb->ptr) {
-		free(cdb->ptr);
-	}
-	free(cdb);
-}
-
-
-void cdb_close_cursor(int cdb) {
-	if (TSD->cursors[cdb] != NULL) {
-		cclose(TSD->cursors[cdb]);
-	}
-
-	TSD->cursors[cdb] = NULL;
-}
-
-
-/* 
- * 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;
-
-	if (TSD->cursors[cdb] != NULL) {
-		syslog(LOG_ERR, "db: cdb_rewind: must close cursor on database %d before reopening", cdb);
-		cdb_abort();
-		/* cclose(TSD->cursors[cdb]); */
-	}
-
-	/*
-	 * Now initialize the cursor
-	 */
-	ret = dbp[cdb]->cursor(dbp[cdb], TSD->tid, &TSD->cursors[cdb], 0);
-	if (ret) {
-		syslog(LOG_ERR, "db: cdb_rewind: db_cursor: %s", db_strerror(ret));
-		cdb_abort();
-	}
-}
-
-
-/*
- * Fetch the next item in a sequential search.  Returns a pointer to a 
- * cdbdata structure, or NULL if we've hit the end.
- */
-struct cdbdata *cdb_next_item(int cdb) {
-	DBT key, data;
-	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));
-	data.flags = DB_DBT_MALLOC;
-
-	ret = TSD->cursors[cdb]->c_get(TSD->cursors[cdb], &key, &data, DB_NEXT);
-
-	if (ret) {
-		if (ret != DB_NOTFOUND) {
-			syslog(LOG_ERR, "db: cdb_next_item(%d): %s", cdb, db_strerror(ret));
-			cdb_abort();
-		}
-		cdb_close_cursor(cdb);
-		return NULL;	/* presumably, end of file */
-	}
-
-	cdbret = (struct cdbdata *) malloc(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(TSD->cursors, "can't begin transaction during r/o cursor");
-
-	if (TSD->tid != NULL) {
-		syslog(LOG_ERR, "db: cdb_begin_transaction: ERROR: nested transaction");
-		cdb_abort();
-	}
-
-	txbegin(&TSD->tid);
-}
-
-
-void cdb_end_transaction(void) {
-	int i;
-
-	for (i = 0; i < MAXCDB; i++) {
-		if (TSD->cursors[i] != NULL) {
-			syslog(LOG_WARNING, "db: cdb_end_transaction: WARNING: cursor %d still open at transaction end", i);
-			cclose(TSD->cursors[i]);
-			TSD->cursors[i] = NULL;
-		}
-	}
-
-	if (TSD->tid == NULL) {
-		syslog(LOG_ERR, "db: cdb_end_transaction: ERROR: txcommit(NULL) !!");
-		cdb_abort();
-	}
-	else {
-		txcommit(TSD->tid);
-	}
-
-	TSD->tid = NULL;
-}
-
-
-/*
- * Truncate (delete every record)
- */
-void cdb_trunc(int cdb) {
-	/* DB_TXN *tid; */
-	int ret;
-	u_int32_t count;
-
-	if (TSD->tid != NULL) {
-		syslog(LOG_ERR, "db: cdb_trunc must not be called in a transaction.");
-		cdb_abort();
-	}
-	else {
-		bailIfCursor(TSD->cursors, "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 {
-				syslog(LOG_ERR, "db: cdb_truncate(%d): %s", cdb, db_strerror(ret));
-				if (ret == ENOMEM) {
-					syslog(LOG_ERR, "db: You may need to tune your database; please read http://www.citadel.org/doku.php?id=faq:troubleshooting:out_of_lock_entries for more information.");
-				}
-				exit(CTDLEXIT_DB);
-			}
-		}
-		else {
-			/* txcommit(tid); */
-		}
-	}
-}
-
-
-// compact (defragment) the database, possibly returning space back to the underlying filesystem
-void cdb_compact(void) {
-	int ret;
-	int i;
-
-	syslog(LOG_DEBUG, "db: cdb_compact() started");
-	for (i = 0; i < MAXCDB; i++) {
-		syslog(LOG_DEBUG, "db: compacting database %d", i);
-		ret = dbp[i]->compact(dbp[i], NULL, NULL, NULL, NULL, DB_FREE_SPACE, NULL);
-		if (ret) {
-			syslog(LOG_ERR, "db: compact: %s", db_strerror(ret));
-		}
-	}
-	syslog(LOG_DEBUG, "db: cdb_compact() finished");
-}
-
-
-// Has an item already been seen (is it in the CDB_USETABLE) ?
-// Returns 0 if it hasn't, 1 if it has
-// In either case, writes the item to the database for next time.
-int CheckIfAlreadySeen(StrBuf *guid) {
-	int found = 0;
-	struct UseTable ut;
-	struct cdbdata *cdbut;
-
-	syslog(LOG_DEBUG, "db: CheckIfAlreadySeen(%s)", ChrPtr(guid));
-	cdbut = cdb_fetch(CDB_USETABLE, SKEY(guid));
-	if (cdbut != NULL) {
-		found = 1;
-		cdb_free(cdbut);
-	}
-
-	/* (Re)write the record, to update the timestamp.  Zeroing it out makes it compress better. */
-	memset(&ut, 0, sizeof(struct UseTable));
-	memcpy(ut.ut_msgid, SKEY(guid));
-	ut.ut_timestamp = time(NULL);
-	cdb_store(CDB_USETABLE, SKEY(guid), &ut, sizeof(struct UseTable));
-	return (found);
-}
-
-
-CTDL_MODULE_INIT(database)
-{
-	if (!threading) {
-		// nothing to do here
-	}
-
-	/* return our module id for the log */
-	return "database";
-}