rados: add a connected flag to the conn obj

Signed-off-by: Noah Watkins <nwatkins@redhat.com>

rados/conn.go

@@ -18,7 +18,8 @@ type ClusterStat struct {
 
 // Conn is a connection handle to a Ceph cluster.
 type Conn struct {
-	cluster C.rados_t
+	cluster   C.rados_t
+	connected bool
 }
 
 // PingMonitor sends a ping to a monitor and returns the reply.

rados/rados.go

@@ -37,11 +37,13 @@ func Version() (int, int, int) {
 	return int(c_major), int(c_minor), int(c_patch)
 }
 
-// NewConn creates a new connection object. It returns the connection and an
-// error, if any.
-func NewConn() (*Conn, error) {
-	conn := &Conn{}
-	ret := C.rados_create(&conn.cluster, nil)
+func makeConn() *Conn {
+	return &Conn{connected: false}
+}
+
+func newConn(user *C.char) (*Conn, error) {
+	conn := makeConn()
+	ret := C.rados_create(&conn.cluster, user)
 
 	if ret == 0 {
 		return conn, nil
@@ -50,20 +52,18 @@ func NewConn() (*Conn, error) {
 	}
 }
 
+// NewConn creates a new connection object. It returns the connection and an
+// error, if any.
+func NewConn() (*Conn, error) {
+	return newConn(nil)
+}
+
 // NewConnWithUser creates a new connection object with a custom username.
 // It returns the connection and an error, if any.
 func NewConnWithUser(user string) (*Conn, error) {
 	c_user := C.CString(user)
 	defer C.free(unsafe.Pointer(c_user))
-
-	conn := &Conn{}
-	ret := C.rados_create(&conn.cluster, c_user)
-
-	if ret == 0 {
-		return conn, nil
-	} else {
-		return nil, RadosError(int(ret))
-	}
+	return newConn(c_user)
 }
 
 // NewConnWithClusterAndUser creates a new connection object for a specific cluster and username.
@@ -75,7 +75,7 @@ func NewConnWithClusterAndUser(clusterName string, userName string) (*Conn, erro
 	c_name := C.CString(userName)
 	defer C.free(unsafe.Pointer(c_name))
 
-	conn := &Conn{}
+	conn := makeConn()
 	ret := C.rados_create2(&conn.cluster, c_cluster_name, c_name, 0)
 	if ret == 0 {
 		return conn, nil