Added NewConnWithUser to allow users other than the default

rados/rados.go

@@ -7,6 +7,7 @@ import "C"
 
 import (
 	"fmt"
+	"unsafe"
 )
 
 type RadosError int
@@ -35,3 +36,19 @@ func NewConn() (*Conn, error) {
 		return nil, RadosError(int(ret))
 	}
 }
+
+// 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))
+	}
+}