s3:dbwrap: add a wrapper dbwrap_trans_do()

This function wraps the action() callback into a db
transaction and the transaction is either committed
or cancelled, depending on the return value of
the action function.

Michael

2 files changed, 36 insertions, 0 deletions

diff --git a/source3/include/proto.h b/source3/include/proto.h
index df7815587c..74cedcec18 100644
--- a/source3/include/proto.h
+++ b/source3/include/proto.h
@@ -454,6 +454,9 @@ NTSTATUS dbwrap_trans_store_uint32(struct db_context *db, const char *keystr,
 NTSTATUS dbwrap_trans_store_bystring(struct db_context *db, const char *key,
 				     TDB_DATA data, int flags);
 NTSTATUS dbwrap_trans_delete_bystring(struct db_context *db, const char *key);
+NTSTATUS dbwrap_trans_do(struct db_context *db,
+			 NTSTATUS (*action)(struct db_context *, void *),
+			 void *private_data);
 
 /* The following definitions come from lib/debug.c  */
 
diff --git a/source3/lib/dbwrap_util.c b/source3/lib/dbwrap_util.c
index 3be3a49e7d..67471b5c96 100644
--- a/source3/lib/dbwrap_util.c
+++ b/source3/lib/dbwrap_util.c
@@ -307,3 +307,36 @@ NTSTATUS dbwrap_trans_delete_bystring(struct db_context *db, const char *key)
 {
 	return dbwrap_trans_delete(db, string_term_tdb_data(key));
 }
+
+/**
+ * Wrap db action(s) into a transaction.
+ */
+NTSTATUS dbwrap_trans_do(struct db_context *db,
+			 NTSTATUS (*action)(struct db_context *, void *),
+			 void *private_data)
+{
+	int res;
+	NTSTATUS status;
+
+	res = db->transaction_start(db);
+	if (res != 0) {
+		DEBUG(5, ("transaction_start failed\n"));
+		return NT_STATUS_INTERNAL_DB_CORRUPTION;
+	}
+
+	status = action(db, private_data);
+	if (!NT_STATUS_IS_OK(status)) {
+		if (db->transaction_cancel(db) != 0) {
+			smb_panic("Cancelling transaction failed");
+		}
+		return status;
+	}
+
+	res = db->transaction_commit(db);
+	if (res == 0) {
+		return NT_STATUS_OK;
+	}
+
+	DEBUG(2, ("transaction_commit failed\n"));
+	return NT_STATUS_INTERNAL_DB_CORRUPTION;
+}