python plugin: Properly deal with identifier being NULL in a log callback.

diff --git a/src/python.c b/src/python.c
index a682f31..a555734 100644 (file)
--- a/src/python.c
+++ b/src/python.c
@@ -197,7 +197,7 @@ static char reg_flush_doc[] = "register_flush(callback[, data][, name]) -> ident
                "The callback function will be called with two or three parameters:\n"
                "timeout: Indicates that only data older than 'timeout' seconds is to\n"
                "    be flushed.\n"
-               "id: Specifies which values are to be flushed.\n"
+               "id: Specifies which values are to be flushed. Might be None.\n"
                "data: The optional data parameter passed to the register function.\n"
                "    If the parameter was omitted it will be omitted here, too.";
 
@@ -520,7 +520,12 @@ static void cpy_flush_callback(int timeout, const char *id, user_data_t *data) {
        PyObject *ret, *text;
 
        CPY_LOCK_THREADS
-       text = cpy_string_to_unicode_or_bytes(id);
+       if (id) {
+               text = cpy_string_to_unicode_or_bytes(id);
+       } else {
+               text = Py_None;
+               Py_INCREF(text);
+       }
        if (c->data == NULL)
                ret = PyObject_CallFunction(c->callback, "iN", timeout, text); /* New reference. */
        else