r20887: allow the registration of multiple cluster backends

this is in preparation for ctdb
(This used to be commit 489f022175a1022bcca8053116362825daae5e40)

3 files changed, 66 insertions, 6 deletions

diff --git a/source4/cluster/cluster.c b/source4/cluster/cluster.c
index fef5bce0d1..0bd4649376 100644
--- a/source4/cluster/cluster.c
+++ b/source4/cluster/cluster.c
@@ -22,16 +22,39 @@
 
 #include "includes.h"
 #include "cluster/cluster.h"
+#include "cluster/cluster_private.h"
+
+static struct cluster_ops *ops;
+
+/* set cluster operations */
+void cluster_set_ops(struct cluster_ops *new_ops)
+{
+	ops = new_ops;
+}
+
+/*
+  not a nice abstraction :(
+*/
+void *cluster_private(void)
+{
+	return ops->private;
+}
+
+/* by default use the local ops */
+static void cluster_init(void)
+{
+	if (ops == NULL) cluster_local_init();
+}
+
+
 
 /*
   server a server_id for the local node
 */
 struct server_id cluster_id(uint32_t id)
 {
-	struct server_id server_id;
-	ZERO_STRUCT(server_id);
-	server_id.id = id;
-	return server_id;
+	cluster_init();
+	return ops->cluster_id(ops, id);
 }
 
 
@@ -40,6 +63,6 @@ struct server_id cluster_id(uint32_t id)
 */
 const char *cluster_id_string(TALLOC_CTX *mem_ctx, struct server_id id)
 {
-	return talloc_asprintf(mem_ctx, "%u.%u", id.node, id.id);
+	cluster_init();
+	return ops->cluster_id_string(ops, mem_ctx, id);
 }
-
diff --git a/source4/cluster/cluster.h b/source4/cluster/cluster.h
index 3c7f83960e..54dfec6259 100644
--- a/source4/cluster/cluster.h
+++ b/source4/cluster/cluster.h
@@ -31,5 +31,6 @@
 /* prototypes */
 struct server_id cluster_id(uint32_t id);
 const char *cluster_id_string(TALLOC_CTX *mem_ctx, struct server_id id);
+void *cluster_private(void);
 
 #endif
diff --git a/source4/cluster/cluster_private.h b/source4/cluster/cluster_private.h
new file mode 100644
index 0000000000..e5df10060f
--- /dev/null
+++ b/source4/cluster/cluster_private.h
@@ -0,0 +1,36 @@
+/* 
+   Unix SMB/CIFS implementation.
+
+   private structures for clustering
+
+   Copyright (C) Andrew Tridgell 2006
+   
+   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 2 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, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#ifndef _CLUSTER_PRIVATE_H_
+#define _CLUSTER_PRIVATE_H_
+
+struct cluster_ops {
+	struct server_id (*cluster_id)(struct cluster_ops *ops, uint32_t id);
+	const char *(*cluster_id_string)(struct cluster_ops *ops, 
+					 TALLOC_CTX *, struct server_id );
+	void *private; /* backend state */
+};
+
+void cluster_set_ops(struct cluster_ops *new_ops);
+void cluster_local_init(void);
+
+#endif