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/*
ctdb_message protocol code
Copyright (C) Andrew Tridgell 2007
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
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.
You should have received a copy of the GNU General Public License
along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
/*
see http://wiki.samba.org/index.php/Samba_%26_Clustering for
protocol design and packet details
*/
#include "includes.h"
#include "../tdb/include/tdb.h"
#include "system/network.h"
#include "system/filesys.h"
#include "../include/ctdb_private.h"
#include "../lib/util/dlinklist.h"
/*
this dispatches the messages to the registered ctdb message handler
*/
int ctdb_dispatch_message(struct ctdb_context *ctdb, uint64_t srvid, TDB_DATA data)
{
struct ctdb_message_list *ml;
for (ml=ctdb->message_list;ml;ml=ml->next) {
if (ml->srvid == srvid || ml->srvid == CTDB_SRVID_ALL) {
ml->message_handler(ctdb, srvid, data, ml->message_private);
}
}
return 0;
}
/*
called when a CTDB_REQ_MESSAGE packet comes in
*/
void ctdb_request_message(struct ctdb_context *ctdb, struct ctdb_req_header *hdr)
{
struct ctdb_req_message *c = (struct ctdb_req_message *)hdr;
TDB_DATA data;
data.dptr = &c->data[0];
data.dsize = c->datalen;
ctdb_dispatch_message(ctdb, c->srvid, data);
}
/*
when a client goes away, we need to remove its srvid handler from the list
*/
static int message_handler_destructor(struct ctdb_message_list *m)
{
DLIST_REMOVE(m->ctdb->message_list, m);
return 0;
}
/*
setup handler for receipt of ctdb messages from ctdb_send_message()
*/
int ctdb_register_message_handler(struct ctdb_context *ctdb,
TALLOC_CTX *mem_ctx,
uint64_t srvid,
ctdb_message_fn_t handler,
void *private_data)
{
struct ctdb_message_list *m;
m = talloc(mem_ctx, struct ctdb_message_list);
CTDB_NO_MEMORY(ctdb, m);
m->ctdb = ctdb;
m->srvid = srvid;
m->message_handler = handler;
m->message_private = private_data;
DLIST_ADD(ctdb->message_list, m);
talloc_set_destructor(m, message_handler_destructor);
return 0;
}
/*
setup handler for receipt of ctdb messages from ctdb_send_message()
*/
int ctdb_deregister_message_handler(struct ctdb_context *ctdb, uint64_t srvid, void *private_data)
{
struct ctdb_message_list *m;
for (m=ctdb->message_list;m;m=m->next) {
if (m->srvid == srvid && m->message_private == private_data) {
talloc_free(m);
return 0;
}
}
return -1;
}
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