1 files changed, 112 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..1aea28fd35
--- /dev/null
+++ b/source4/cluster/ctdb/common/ctdb_message.c
@@ -0,0 +1,112 @@
+/* 
+   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 "lib/events/events.h"
+#include "lib/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;
+}