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microprotocols.c
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144 lines (123 loc) · 4.23 KB
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/* microprotocols.c - minimalist and non-validating protocols implementation
*
* Copyright (C) 2003-2004 Federico Di Gregorio <fog@debian.org>
*
* This file is part of psycopg and was adapted for pysqlite. Federico Di
* Gregorio gave the permission to use it within pysqlite under the following
* license:
*
* This software is provided 'as-is', without any express or implied
* warranty. In no event will the authors be held liable for any damages
* arising from the use of this software.
*
* Permission is granted to anyone to use this software for any purpose,
* including commercial applications, and to alter it and redistribute it
* freely, subject to the following restrictions:
*
* 1. The origin of this software must not be misrepresented; you must not
* claim that you wrote the original software. If you use this software
* in a product, an acknowledgment in the product documentation would be
* appreciated but is not required.
* 2. Altered source versions must be plainly marked as such, and must not be
* misrepresented as being the original software.
* 3. This notice may not be removed or altered from any source distribution.
*/
#include <Python.h>
#include "cursor.h"
#include "microprotocols.h"
#include "prepare_protocol.h"
/* pysqlite_microprotocols_init - initialize the adapters dictionary */
int
pysqlite_microprotocols_init(PyObject *module)
{
/* create adapters dictionary and put it in module namespace */
pysqlite_state *state = pysqlite_get_state(module);
state->psyco_adapters = PyDict_New();
if (state->psyco_adapters == NULL) {
return -1;
}
return PyModule_AddObjectRef(module, "adapters", state->psyco_adapters);
}
/* pysqlite_microprotocols_add - add a reverse type-caster to the dictionary */
int
pysqlite_microprotocols_add(pysqlite_state *state, PyTypeObject *type,
PyObject *proto, PyObject *cast)
{
PyObject* key;
int rc;
assert(type != NULL);
assert(proto != NULL);
key = PyTuple_Pack(2, (PyObject *)type, proto);
if (!key) {
return -1;
}
rc = PyDict_SetItem(state->psyco_adapters, key, cast);
Py_DECREF(key);
return rc;
}
/* pysqlite_microprotocols_adapt - adapt an object to the built-in protocol */
PyObject *
pysqlite_microprotocols_adapt(pysqlite_state *state, PyObject *obj,
PyObject *proto, PyObject *alt)
{
PyObject *adapter, *key, *adapted;
/* we don't check for exact type conformance as specified in PEP 246
because the PrepareProtocolType type is abstract and there is no
way to get a quotable object to be its instance */
/* look for an adapter in the registry */
key = PyTuple_Pack(2, (PyObject *)Py_TYPE(obj), proto);
if (!key) {
return NULL;
}
adapter = PyDict_GetItemWithError(state->psyco_adapters, key);
Py_DECREF(key);
if (adapter) {
Py_INCREF(adapter);
adapted = PyObject_CallOneArg(adapter, obj);
Py_DECREF(adapter);
return adapted;
}
if (PyErr_Occurred()) {
return NULL;
}
/* try to have the protocol adapt this object */
if (_PyObject_LookupAttr(proto, state->str___adapt__, &adapter) < 0) {
return NULL;
}
if (adapter) {
adapted = PyObject_CallOneArg(adapter, obj);
Py_DECREF(adapter);
if (adapted == Py_None) {
Py_DECREF(adapted);
}
else if (adapted || !PyErr_ExceptionMatches(PyExc_TypeError)) {
return adapted;
}
else {
PyErr_Clear();
}
}
/* and finally try to have the object adapt itself */
if (_PyObject_LookupAttr(obj, state->str___conform__, &adapter) < 0) {
return NULL;
}
if (adapter) {
adapted = PyObject_CallOneArg(adapter, proto);
Py_DECREF(adapter);
if (adapted == Py_None) {
Py_DECREF(adapted);
}
else if (adapted || !PyErr_ExceptionMatches(PyExc_TypeError)) {
return adapted;
}
else {
PyErr_Clear();
}
}
if (alt) {
return Py_NewRef(alt);
}
/* else set the right exception and return NULL */
PyErr_SetString(state->ProgrammingError, "can't adapt");
return NULL;
}