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1dc7f2c4f8
This is a completely standalone library using only ctdb_protocol.h. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Header from folded patch 'libctdb-message-handling.patch': libctdb: add message handling to libctdb. Now clients can send and receive ctdb messages. (This used to be ctdb commit 732cf6ead4aa2fbefc2b81328171f52c8d935341)
95 lines
2.6 KiB
C
95 lines
2.6 KiB
C
/*
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libctdb local tdb access code
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Copyright (C) Andrew Tridgell 2006
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Copyright (C) Rusty Russell 2010
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include <ctdb.h>
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#include <tdb.h>
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#include <stdlib.h>
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#include <stdbool.h>
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#include <string.h>
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#include <ctdb_protocol.h> // For struct ctdb_ltdb_header
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#include "local_tdb.h"
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/*
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fetch a record from the ltdb, separating out the header information
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and returning the body of the record. The caller should free() the
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header when done, rather than the (optional) data->dptr.
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*/
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struct ctdb_ltdb_header *ctdb_local_fetch(struct tdb_context *tdb,
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TDB_DATA key, TDB_DATA *data)
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{
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TDB_DATA rec;
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rec = tdb_fetch(tdb, key);
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if (rec.dsize < sizeof(struct ctdb_ltdb_header)) {
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free(rec.dptr);
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return NULL;
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}
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if (data) {
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data->dsize = rec.dsize - sizeof(struct ctdb_ltdb_header);
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data->dptr = rec.dptr + sizeof(struct ctdb_ltdb_header);
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}
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return (struct ctdb_ltdb_header *)rec.dptr;
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}
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/*
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write a record to a normal database
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*/
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int ctdb_local_store(struct tdb_context *tdb, TDB_DATA key,
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struct ctdb_ltdb_header *header, TDB_DATA data)
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{
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TDB_DATA rec;
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int ret;
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bool seqnum_suppressed = false;
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rec.dsize = sizeof(*header) + data.dsize;
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rec.dptr = malloc(rec.dsize);
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if (!rec.dptr) {
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return -1;
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}
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memcpy(rec.dptr, header, sizeof(*header));
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memcpy(rec.dptr + sizeof(*header), data.dptr, data.dsize);
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/* Databases with seqnum updates enabled only get their seqnum
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changes when/if we modify the data */
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if (tdb_get_flags(tdb) & TDB_SEQNUM) {
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TDB_DATA old;
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old = tdb_fetch(tdb, key);
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if ( (old.dsize == rec.dsize)
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&& !memcmp(old.dptr+sizeof(struct ctdb_ltdb_header),
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rec.dptr+sizeof(struct ctdb_ltdb_header),
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rec.dsize-sizeof(struct ctdb_ltdb_header)) ) {
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tdb_remove_flags(tdb, TDB_SEQNUM);
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seqnum_suppressed = true;
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}
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free(old.dptr);
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}
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ret = tdb_store(tdb, key, rec, TDB_REPLACE);
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if (seqnum_suppressed) {
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tdb_add_flags(tdb, TDB_SEQNUM);
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}
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free(rec.dptr);
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return ret;
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}
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