r21232: added a raw ctdb messaging api - allowing ctdb applications to take

advantage of the ctdb messaging layer for their own data
(This used to be commit b288ba05e5dc2aa5c8cd26eaee1c41b12e4996da)

1 files changed, 91 insertions, 0 deletions

diff --git a/source4/cluster/ctdb/common/ctdb_message.c b/source4/cluster/ctdb/common/ctdb_message.c
new file mode 100644
index 0000000000..abdf9e6216
--- /dev/null
+++ b/source4/cluster/ctdb/common/ctdb_message.c
@@ -0,0 +1,91 @@
+/* 
+   ctdb_message protocol code
+
+   Copyright (C) Andrew Tridgell  2007
+
+   This library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2 of the License, or (at your option) any later version.
+
+   This library 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with this library; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+*/
+/*
+  see http://wiki.samba.org/index.php/Samba_%26_Clustering for
+  protocol design and packet details
+*/
+#include "includes.h"
+#include "lib/events/events.h"
+#include "lib/tdb/include/tdb.h"
+#include "system/network.h"
+#include "system/filesys.h"
+#include "../include/ctdb_private.h"
+
+
+/*
+  called when a CTDB_REQ_MESSAGE packet comes in
+
+  this dispatches the messages to the registered ctdb message handler
+*/
+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;
+	if (ctdb->message_handler == NULL) {
+		/* no registered message handler */
+		talloc_free(hdr);
+		return;
+	}
+	data.dptr = &c->data[0];
+	data.dsize = c->datalen;
+	ctdb->message_handler(ctdb, c->srvid, data, ctdb->message_private);
+	talloc_free(hdr);
+}
+
+
+/*
+  send a ctdb message
+*/
+int ctdb_send_message(struct ctdb_context *ctdb, uint32_t vnn,
+		      uint32_t srvid, uint32_t msg_type, TDB_DATA data)
+{
+	struct ctdb_req_message *r;
+	int len;
+
+	len = offsetof(struct ctdb_req_message, data) + data.dsize;
+	r = ctdb->methods->allocate_pkt(ctdb, len);
+	CTDB_NO_MEMORY(ctdb, r);
+
+	r->hdr.length    = len;
+	r->hdr.operation = CTDB_REQ_MESSAGE;
+	r->hdr.destnode  = vnn;
+	r->hdr.srcnode   = ctdb->vnn;
+	r->hdr.reqid     = 0;
+	r->srvid         = srvid;
+	r->datalen       = data.dsize;
+	memcpy(&r->data[0], data.dptr, data.dsize);
+	
+	ctdb_queue_packet(ctdb, &r->hdr);
+
+	talloc_free(r);
+	return 0;
+}
+
+/*
+  setup handler for receipt of ctdb messages from ctdb_send_message()
+*/
+int ctdb_set_message_handler(struct ctdb_context *ctdb, ctdb_message_fn_t handler,
+			     void *private)
+{
+	ctdb->message_handler = handler;
+	ctdb->message_private = private;
+	return 0;
+}
+