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Guard from failed keys creation during adaptation

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This commit is contained in:
Daniele Varrazzo 2012-03-04 04:40:44 +00:00
parent 18085201c8
commit dc4c3d3143
1 changed files with 10 additions and 7 deletions
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17
psycopg/microprotocols.c
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@ -78,9 +78,9 @@ exit:
/* Check if one of `obj` superclasses has an adapter for `proto`.
*
* If it does, return a *borrowed reference* to the adapter, else NULL.
* If it does, return a *borrowed reference* to the adapter, else to None.
*/
static PyObject *
BORROWED static PyObject *
_get_superclass_adapter(PyObject *obj, PyObject *proto)
{
PyTypeObject *type;
@ -95,14 +95,14 @@ _get_superclass_adapter(PyObject *obj, PyObject *proto)
#endif
type->tp_mro)) {
/* has no mro */
return NULL;
return Py_None;
}
/* Walk the mro from the most specific subclass. */
mro = type->tp_mro;
for (i = 1, ii = PyTuple_GET_SIZE(mro); i < ii; ++i) {
st = PyTuple_GET_ITEM(mro, i);
key = PyTuple_Pack(2, st, proto);
if (!(key = PyTuple_Pack(2, st, proto))) { return NULL; }
adapter = PyDict_GetItem(psyco_adapters, key);
Py_DECREF(key);
@ -125,7 +125,7 @@ _get_superclass_adapter(PyObject *obj, PyObject *proto)
return adapter;
}
}
return NULL;
return Py_None;
}
@ -145,7 +145,7 @@ microprotocols_adapt(PyObject *obj, PyObject *proto, PyObject *alt)
Py_TYPE(obj)->tp_name);
/* look for an adapter in the registry */
key = PyTuple_Pack(2, Py_TYPE(obj), proto);
if (!(key = PyTuple_Pack(2, Py_TYPE(obj), proto))) { return NULL; }
adapter = PyDict_GetItem(psyco_adapters, key);
Py_DECREF(key);
if (adapter) {
@ -154,7 +154,10 @@ microprotocols_adapt(PyObject *obj, PyObject *proto, PyObject *alt)
}
/* Check if a superclass can be adapted and use the same adapter. */
if (NULL != (adapter = _get_superclass_adapter(obj, proto))) {
if (!(adapter = _get_superclass_adapter(obj, proto))) {
return NULL;
}
if (Py_None != adapter) {
adapted = PyObject_CallFunctionObjArgs(adapter, obj, NULL);
return adapted;
}