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pigweed / third_party / github / protocolbuffers / protobuf / refs/heads/main / . / python / message.c
blob: d5213ab1af9f89e45efeda0f6eee68bddaaa867b [file] [log] [blame]
// Protocol Buffers - Google's data interchange format
// Copyright 2023 Google LLC. All rights reserved.
//
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file or at
// https://developers.google.com/open-source/licenses/bsd
#include "python/message.h"
#include "python/convert.h"
#include "python/descriptor.h"
#include "python/extension_dict.h"
#include "python/map.h"
#include "python/repeated.h"
#include "upb/message/compare.h"
#include "upb/message/copy.h"
#include "upb/reflection/def.h"
#include "upb/reflection/message.h"
#include "upb/text/encode.h"
#include "upb/util/required_fields.h"
static const upb_MessageDef* PyUpb_MessageMeta_GetMsgdef(PyObject* cls);
static PyObject* PyUpb_MessageMeta_GetAttr(PyObject* self, PyObject* name);
// -----------------------------------------------------------------------------
// CPythonBits
// -----------------------------------------------------------------------------
// This struct contains a few things that are not exposed directly through the
// limited API, but that we can get at in somewhat more roundabout ways. The
// roundabout ways are slower, so we cache the values here.
//
// These values are valid to cache in a global, even across sub-interpreters,
// because they are not pointers to interpreter state. They are process
// globals that will be the same for any interpreter in this process.
typedef struct {
// For each member, we note the equivalent expression that we could use in the
// full (non-limited) API.
newfunc type_new; // PyTypeObject.tp_new
destructor type_dealloc; // PyTypeObject.tp_dealloc
getattrofunc type_getattro; // PyTypeObject.tp_getattro
setattrofunc type_setattro; // PyTypeObject.tp_setattro
size_t type_basicsize; // sizeof(PyHeapTypeObject)
traverseproc type_traverse; // PyTypeObject.tp_traverse
inquiry type_clear; // PyTypeObject.tp_clear
// While we can refer to PY_VERSION_HEX in the limited API, this will give us
// the version of Python we were compiled against, which may be different
// than the version we are dynamically linked against. Here we want the
// version that is actually running in this process.
long python_version_hex; // PY_VERSION_HEX
} PyUpb_CPythonBits;
// A global containing the values for this process.
PyUpb_CPythonBits cpython_bits;
destructor upb_Pre310_PyType_GetDeallocSlot(PyTypeObject* type_subclass) {
// This is a bit desperate. We need type_dealloc(), but PyType_GetSlot(type,
// Py_tp_dealloc) will return subtype_dealloc(). There appears to be no way
// whatsoever to fetch type_dealloc() through the limited API until Python
// 3.10.
//
// To work around this so we attempt to find it by looking for the offset of
// tp_dealloc in PyTypeObject, then memcpy() it directly. This should always
// work in practice.
//
// Starting with Python 3.10 on you can call PyType_GetSlot() on non-heap
// types. We will be able to replace all this hack with just:
//
// PyType_GetSlot(&PyType_Type, Py_tp_dealloc)
//
destructor subtype_dealloc = PyType_GetSlot(type_subclass, Py_tp_dealloc);
for (size_t i = 0; i < 2000; i += sizeof(uintptr_t)) {
destructor maybe_subtype_dealloc;
memcpy(&maybe_subtype_dealloc, (char*)type_subclass + i,
sizeof(destructor));
if (maybe_subtype_dealloc == subtype_dealloc) {
destructor type_dealloc;
memcpy(&type_dealloc, (char*)&PyType_Type + i, sizeof(destructor));
return type_dealloc;
}
}
assert(false);
return NULL;
}
static bool PyUpb_CPythonBits_Init(PyUpb_CPythonBits* bits) {
PyObject* bases = NULL;
PyTypeObject* type = NULL;
PyObject* size = NULL;
PyObject* sys = NULL;
PyObject* hex_version = NULL;
bool ret = false;
// PyType_GetSlot() only works on heap types, so we cannot use it on
// &PyType_Type directly. Instead we create our own (temporary) type derived
// from PyType_Type: this will inherit all of the slots from PyType_Type, but
// as a heap type it can be queried with PyType_GetSlot().
static PyType_Slot dummy_slots[] = {{0, NULL}};
static PyType_Spec dummy_spec = {
"module.DummyClass", // tp_name
0, // To be filled in by size of base // tp_basicsize
0, // tp_itemsize
Py_TPFLAGS_DEFAULT, // tp_flags
dummy_slots,
};
bases = Py_BuildValue("(O)", &PyType_Type);
if (!bases) goto err;
type = (PyTypeObject*)PyType_FromSpecWithBases(&dummy_spec, bases);
if (!type) goto err;
bits->type_new = PyType_GetSlot(type, Py_tp_new);
bits->type_dealloc = upb_Pre310_PyType_GetDeallocSlot(type);
bits->type_getattro = PyType_GetSlot(type, Py_tp_getattro);
bits->type_setattro = PyType_GetSlot(type, Py_tp_setattro);
bits->type_traverse = PyType_GetSlot(type, Py_tp_traverse);
bits->type_clear = PyType_GetSlot(type, Py_tp_clear);
size = PyObject_GetAttrString((PyObject*)&PyType_Type, "__basicsize__");
if (!size) goto err;
bits->type_basicsize = PyLong_AsLong(size);
if (bits->type_basicsize == -1) goto err;
assert(bits->type_new);
assert(bits->type_dealloc);
assert(bits->type_getattro);
assert(bits->type_setattro);
assert(bits->type_traverse);
assert(bits->type_clear);
#ifndef Py_LIMITED_API
assert(bits->type_new == PyType_Type.tp_new);
assert(bits->type_dealloc == PyType_Type.tp_dealloc);
assert(bits->type_getattro == PyType_Type.tp_getattro);
assert(bits->type_setattro == PyType_Type.tp_setattro);
assert(bits->type_basicsize == sizeof(PyHeapTypeObject));
assert(bits->type_traverse == PyType_Type.tp_traverse);
assert(bits->type_clear == PyType_Type.tp_clear);
#endif
sys = PyImport_ImportModule("sys");
hex_version = PyObject_GetAttrString(sys, "hexversion");
bits->python_version_hex = PyLong_AsLong(hex_version);
ret = true;
err:
Py_XDECREF(bases);
Py_XDECREF(type);
Py_XDECREF(size);
Py_XDECREF(sys);
Py_XDECREF(hex_version);
return ret;
}
// -----------------------------------------------------------------------------
// Message
// -----------------------------------------------------------------------------
// The main message object. The type of the object (PyUpb_Message.ob_type)
// will be an instance of the PyUpb_MessageMeta type (defined below). So the
// chain is:
// FooMessage = MessageMeta(...)
// foo = FooMessage()
//
// Which becomes:
// Object C Struct Type Python type (ob_type)
// ----------------- ----------------- ---------------------
// foo PyUpb_Message FooMessage
// FooMessage PyUpb_MessageMeta message_meta_type
// message_meta_type PyTypeObject 'type' in Python
//
// A message object can be in one of two states: present or non-present. When
// a message is non-present, it stores a reference to its parent, and a write
// to any attribute will trigger the message to become present in its parent.
// The parent may also be non-present, in which case a mutation will trigger a
// chain reaction.
typedef struct PyUpb_Message {
PyObject_HEAD;
PyObject* arena;
uintptr_t def; // Tagged, low bit 1 == upb_FieldDef*, else upb_MessageDef*
union {
// when def is msgdef, the data for this msg.
upb_Message* msg;
// when def is fielddef, owning pointer to parent
struct PyUpb_Message* parent;
} ptr;
PyObject* ext_dict; // Weak pointer to extension dict, if any.
// name->obj dict for non-present msg/map/repeated, NULL if none.
PyUpb_WeakMap* unset_subobj_map;
int version;
} PyUpb_Message;
static PyObject* PyUpb_Message_GetAttr(PyObject* _self, PyObject* attr);
bool PyUpb_Message_IsStub(PyUpb_Message* msg) { return msg->def & 1; }
const upb_FieldDef* PyUpb_Message_GetFieldDef(PyUpb_Message* msg) {
assert(PyUpb_Message_IsStub(msg));
return (void*)(msg->def & ~(uintptr_t)1);
}
static const upb_MessageDef* _PyUpb_Message_GetMsgdef(PyUpb_Message* msg) {
return PyUpb_Message_IsStub(msg)
? upb_FieldDef_MessageSubDef(PyUpb_Message_GetFieldDef(msg))
: (void*)msg->def;
}
const upb_MessageDef* PyUpb_Message_GetMsgdef(PyObject* self) {
return _PyUpb_Message_GetMsgdef((PyUpb_Message*)self);
}
static upb_Message* PyUpb_Message_GetMsg(PyUpb_Message* self) {
assert(!PyUpb_Message_IsStub(self));
return self->ptr.msg;
}
bool PyUpb_Message_TryCheck(PyObject* self) {
PyUpb_ModuleState* state = PyUpb_ModuleState_Get();
PyObject* type = (PyObject*)Py_TYPE(self);
return Py_TYPE(type) == state->message_meta_type;
}
bool PyUpb_Message_Verify(PyObject* self) {
if (!PyUpb_Message_TryCheck(self)) {
PyErr_Format(PyExc_TypeError, "Expected a message object, but got %R.",
self);
return false;
}
return true;
}
// If the message is reified, returns it. Otherwise, returns NULL.
// If NULL is returned, the object is empty and has no underlying data.
upb_Message* PyUpb_Message_GetIfReified(PyObject* _self) {
PyUpb_Message* self = (void*)_self;
return PyUpb_Message_IsStub(self) ? NULL : self->ptr.msg;
}
static PyObject* PyUpb_Message_New(PyObject* cls, PyObject* unused_args,
PyObject* unused_kwargs) {
const upb_MessageDef* msgdef = PyUpb_MessageMeta_GetMsgdef(cls);
const upb_MiniTable* layout = upb_MessageDef_MiniTable(msgdef);
PyUpb_Message* msg = (void*)PyType_GenericAlloc((PyTypeObject*)cls, 0);
msg->def = (uintptr_t)msgdef;
msg->arena = PyUpb_Arena_New();
msg->ptr.msg = upb_Message_New(layout, PyUpb_Arena_Get(msg->arena));
msg->unset_subobj_map = NULL;
msg->ext_dict = NULL;
msg->version = 0;
PyObject* ret = &msg->ob_base;
PyUpb_ObjCache_Add(msg->ptr.msg, ret);
return ret;
}
/*
* PyUpb_Message_LookupName()
*
* Tries to find a field or oneof named `py_name` in the message object `self`.
* The user must pass `f` and/or `o` to indicate whether a field or a oneof name
* is expected. If the name is found and it has an expected type, the function
* sets `*f` or `*o` respectively and returns true. Otherwise returns false
* and sets an exception of type `exc_type` if provided.
*/
static bool PyUpb_Message_LookupName(PyUpb_Message* self, PyObject* py_name,
const upb_FieldDef** f,
const upb_OneofDef** o,
PyObject* exc_type) {
assert(f || o);
Py_ssize_t size;
const char* name = NULL;
if (PyUnicode_Check(py_name)) {
name = PyUnicode_AsUTF8AndSize(py_name, &size);
} else if (PyBytes_Check(py_name)) {
PyBytes_AsStringAndSize(py_name, (char**)&name, &size);
}
if (!name) {
PyErr_Format(exc_type,
"Expected a field name, but got non-string argument %S.",
py_name);
return false;
}
const upb_MessageDef* msgdef = _PyUpb_Message_GetMsgdef(self);
if (!upb_MessageDef_FindByNameWithSize(msgdef, name, size, f, o)) {
if (exc_type) {
PyErr_Format(exc_type, "Protocol message %s has no \"%s\" field.",
upb_MessageDef_Name(msgdef), name);
}
return false;
}
if (!o && !*f) {
if (exc_type) {
PyErr_Format(exc_type, "Expected a field name, but got oneof name %s.",
name);
}
return false;
}
if (!f && !*o) {
if (exc_type) {
PyErr_Format(exc_type, "Expected a oneof name, but got field name %s.",
name);
}
return false;
}
return true;
}
static bool PyUpb_Message_InitMessageMapEntry(PyObject* dst, PyObject* src) {
if (!src || !dst) return false;
PyObject* ok = PyObject_CallMethod(dst, "CopyFrom", "O", src);
if (!ok) return false;
Py_DECREF(ok);
return true;
}
int PyUpb_Message_InitMapAttributes(PyObject* map, PyObject* value,
const upb_FieldDef* f) {
const upb_MessageDef* entry_m = upb_FieldDef_MessageSubDef(f);
const upb_FieldDef* val_f = upb_MessageDef_Field(entry_m, 1);
PyObject* it = NULL;
PyObject* tmp = NULL;
int ret = -1;
if (upb_FieldDef_IsSubMessage(val_f)) {
it = PyObject_GetIter(value);
if (it == NULL) {
PyErr_Format(PyExc_TypeError, "Argument for field %s is not iterable",
upb_FieldDef_FullName(f));
goto err;
}
PyObject* e;
while ((e = PyIter_Next(it)) != NULL) {
PyObject* src = PyObject_GetItem(value, e);
PyObject* dst = PyObject_GetItem(map, e);
Py_DECREF(e);
bool ok = PyUpb_Message_InitMessageMapEntry(dst, src);
Py_XDECREF(src);
Py_XDECREF(dst);
if (!ok) goto err;
}
} else {
tmp = PyObject_CallMethod(map, "update", "O", value);
if (!tmp) goto err;
}
ret = 0;
err:
Py_XDECREF(it);
Py_XDECREF(tmp);
return ret;
}
void PyUpb_Message_EnsureReified(PyUpb_Message* self);
static bool PyUpb_Message_InitMapAttribute(PyObject* _self, PyObject* name,
const upb_FieldDef* f,
PyObject* value) {
PyObject* map = PyUpb_Message_GetAttr(_self, name);
int ok = PyUpb_Message_InitMapAttributes(map, value, f);
Py_DECREF(map);
return ok >= 0;
}
static bool PyUpb_Message_InitRepeatedMessageAttribute(PyObject* _self,
PyObject* repeated,
PyObject* value,
const upb_FieldDef* f) {
PyObject* it = PyObject_GetIter(value);
if (!it) {
PyErr_Format(PyExc_TypeError, "Argument for field %s is not iterable",
upb_FieldDef_FullName(f));
return false;
}
PyObject* e = NULL;
PyObject* m = NULL;
while ((e = PyIter_Next(it)) != NULL) {
if (PyDict_Check(e)) {
m = PyUpb_RepeatedCompositeContainer_Add(repeated, NULL, e);
if (!m) goto err;
} else {
m = PyUpb_RepeatedCompositeContainer_Add(repeated, NULL, NULL);
if (!m) goto err;
PyObject* merged = PyUpb_Message_MergeFrom(m, e);
if (!merged) goto err;
Py_DECREF(merged);
}
Py_DECREF(e);
Py_DECREF(m);
m = NULL;
}
err:
Py_XDECREF(it);
Py_XDECREF(e);
Py_XDECREF(m);
return !PyErr_Occurred(); // Check PyIter_Next() exit.
}
static bool PyUpb_Message_InitRepeatedAttribute(PyObject* _self, PyObject* name,
PyObject* value) {
PyUpb_Message* self = (void*)_self;
const upb_FieldDef* field;
if (!PyUpb_Message_LookupName(self, name, &field, NULL,
PyExc_AttributeError)) {
return false;
}
bool ok = false;
PyObject* repeated = PyUpb_Message_GetFieldValue(_self, field);
PyObject* tmp = NULL;
if (!repeated) goto err;
if (upb_FieldDef_IsSubMessage(field)) {
if (!PyUpb_Message_InitRepeatedMessageAttribute(_self, repeated, value,
field)) {
goto err;
}
} else {
tmp = PyUpb_RepeatedContainer_Extend(repeated, value);
if (!tmp) goto err;
}
ok = true;
err:
Py_XDECREF(repeated);
Py_XDECREF(tmp);
return ok;
}
static bool PyUpb_Message_InitMessageAttribute(PyObject* _self, PyObject* name,
PyObject* value) {
PyObject* submsg = PyUpb_Message_GetAttr(_self, name);
if (!submsg) return -1;
assert(!PyErr_Occurred());
bool ok;
if (PyUpb_Message_TryCheck(value)) {
PyObject* tmp = PyUpb_Message_MergeFrom(submsg, value);
ok = tmp != NULL;
Py_XDECREF(tmp);
} else if (PyDict_Check(value)) {
assert(!PyErr_Occurred());
ok = PyUpb_Message_InitAttributes(submsg, NULL, value) >= 0;
} else {
const upb_MessageDef* m = PyUpb_Message_GetMsgdef(_self);
PyErr_Format(PyExc_TypeError, "Message must be initialized with a dict: %s",
upb_MessageDef_FullName(m));
ok = false;
}
Py_DECREF(submsg);
return ok;
}
static bool PyUpb_Message_InitScalarAttribute(upb_Message* msg,
const upb_FieldDef* f,
PyObject* value,
upb_Arena* arena) {
upb_MessageValue msgval;
assert(!PyErr_Occurred());
if (!PyUpb_PyToUpb(value, f, &msgval, arena)) return false;
upb_Message_SetFieldByDef(msg, f, msgval, arena);
return true;
}
int PyUpb_Message_InitAttributes(PyObject* _self, PyObject* args,
PyObject* kwargs) {
assert(!PyErr_Occurred());
if (args != NULL && PyTuple_Size(args) != 0) {
PyErr_SetString(PyExc_TypeError, "No positional arguments allowed");
return -1;
}
if (kwargs == NULL) return 0;
PyUpb_Message* self = (void*)_self;
Py_ssize_t pos = 0;
PyObject* name;
PyObject* value;
PyUpb_Message_EnsureReified(self);
upb_Message* msg = PyUpb_Message_GetMsg(self);
upb_Arena* arena = PyUpb_Arena_Get(self->arena);
while (PyDict_Next(kwargs, &pos, &name, &value)) {
assert(!PyErr_Occurred());
const upb_FieldDef* f;
assert(!PyErr_Occurred());
if (!PyUpb_Message_LookupName(self, name, &f, NULL, PyExc_ValueError)) {
return -1;
}
if (value == Py_None) continue; // Ignored.
assert(!PyErr_Occurred());
if (upb_FieldDef_IsMap(f)) {
if (!PyUpb_Message_InitMapAttribute(_self, name, f, value)) return -1;
} else if (upb_FieldDef_IsRepeated(f)) {
if (!PyUpb_Message_InitRepeatedAttribute(_self, name, value)) return -1;
} else if (upb_FieldDef_IsSubMessage(f)) {
if (!PyUpb_Message_InitMessageAttribute(_self, name, value)) return -1;
} else {
if (!PyUpb_Message_InitScalarAttribute(msg, f, value, arena)) return -1;
}
if (PyErr_Occurred()) return -1;
}
if (PyErr_Occurred()) return -1;
return 0;
}
static int PyUpb_Message_Init(PyObject* _self, PyObject* args,
PyObject* kwargs) {
if (args != NULL && PyTuple_Size(args) != 0) {
PyErr_SetString(PyExc_TypeError, "No positional arguments allowed");
return -1;
}
return PyUpb_Message_InitAttributes(_self, args, kwargs);
}
static PyObject* PyUpb_Message_NewStub(PyObject* parent, const upb_FieldDef* f,
PyObject* arena) {
const upb_MessageDef* sub_m = upb_FieldDef_MessageSubDef(f);
PyObject* cls = PyUpb_Descriptor_GetClass(sub_m);
PyUpb_Message* msg = (void*)PyType_GenericAlloc((PyTypeObject*)cls, 0);
msg->def = (uintptr_t)f | 1;
msg->arena = arena;
msg->ptr.parent = (PyUpb_Message*)parent;
msg->unset_subobj_map = NULL;
msg->ext_dict = NULL;
msg->version = 0;
Py_DECREF(cls);
Py_INCREF(parent);
Py_INCREF(arena);
return &msg->ob_base;
}
static bool PyUpb_Message_IsEmpty(const upb_Message* msg,
const upb_MessageDef* m,
const upb_DefPool* ext_pool) {
if (!msg) return true;
size_t iter = kUpb_Message_Begin;
const upb_FieldDef* f;
upb_MessageValue val;
if (upb_Message_Next(msg, m, ext_pool, &f, &val, &iter)) return false;
size_t len;
(void)upb_Message_GetUnknown(msg, &len);
return len == 0;
}
static bool PyUpb_Message_IsEqual(PyUpb_Message* m1, PyObject* _m2) {
PyUpb_Message* m2 = (void*)_m2;
if (m1 == m2) return true;
if (!PyObject_TypeCheck(_m2, m1->ob_base.ob_type)) {
return false;
}
const upb_MessageDef* m1_msgdef = _PyUpb_Message_GetMsgdef(m1);
#ifndef NDEBUG
const upb_MessageDef* m2_msgdef = _PyUpb_Message_GetMsgdef(m2);
assert(m1_msgdef == m2_msgdef);
#endif
const upb_Message* m1_msg = PyUpb_Message_GetIfReified((PyObject*)m1);
const upb_Message* m2_msg = PyUpb_Message_GetIfReified(_m2);
const upb_DefPool* symtab = upb_FileDef_Pool(upb_MessageDef_File(m1_msgdef));
const bool e1 = PyUpb_Message_IsEmpty(m1_msg, m1_msgdef, symtab);
const bool e2 = PyUpb_Message_IsEmpty(m2_msg, m1_msgdef, symtab);
if (e1 || e2) return e1 && e2;
const int options = kUpb_CompareOption_IncludeUnknownFields;
return upb_Message_IsEqualByDef(m1_msg, m2_msg, m1_msgdef, options);
}
static const upb_FieldDef* PyUpb_Message_InitAsMsg(PyUpb_Message* m,
upb_Arena* arena) {
const upb_FieldDef* f = PyUpb_Message_GetFieldDef(m);
const upb_MessageDef* m2 = upb_FieldDef_MessageSubDef(f);
m->ptr.msg = upb_Message_New(upb_MessageDef_MiniTable(m2), arena);
m->def = (uintptr_t)m2;
PyUpb_ObjCache_Add(m->ptr.msg, &m->ob_base);
return f;
}
static void PyUpb_Message_SetField(PyUpb_Message* parent, const upb_FieldDef* f,
PyUpb_Message* child, upb_Arena* arena) {
upb_MessageValue msgval = {.msg_val = PyUpb_Message_GetMsg(child)};
upb_Message_SetFieldByDef(PyUpb_Message_GetMsg(parent), f, msgval, arena);
PyUpb_WeakMap_Delete(parent->unset_subobj_map, f);
// Releases a ref previously owned by child->ptr.parent of our child.
Py_DECREF(child);
}
/*
* PyUpb_Message_EnsureReified()
*
* This implements the "expando" behavior of Python protos:
* foo = FooProto()
*
* # The intermediate messages don't really exist, and won't be serialized.
* x = foo.bar.bar.bar.bar.bar.baz
*
* # Now all the intermediate objects are created.
* foo.bar.bar.bar.bar.bar.baz = 5
*
* This function should be called before performing any mutation of a protobuf
* object.
*
* Post-condition:
* PyUpb_Message_IsStub(self) is false
*/
void PyUpb_Message_EnsureReified(PyUpb_Message* self) {
if (!PyUpb_Message_IsStub(self)) return;
upb_Arena* arena = PyUpb_Arena_Get(self->arena);
// This is a non-present message. We need to create a real upb_Message for
// this object and every parent until we reach a present message.
PyUpb_Message* child = self;
PyUpb_Message* parent = self->ptr.parent;
const upb_FieldDef* child_f = PyUpb_Message_InitAsMsg(child, arena);
Py_INCREF(child); // To avoid a special-case in PyUpb_Message_SetField().
do {
PyUpb_Message* next_parent = parent->ptr.parent;
const upb_FieldDef* parent_f = NULL;
if (PyUpb_Message_IsStub(parent)) {
parent_f = PyUpb_Message_InitAsMsg(parent, arena);
}
PyUpb_Message_SetField(parent, child_f, child, arena);
child = parent;
child_f = parent_f;
parent = next_parent;
} while (child_f);
// Releases ref previously owned by child->ptr.parent of our child.
Py_DECREF(child);
self->version++;
}
static void PyUpb_Message_SyncSubobjs(PyUpb_Message* self);
/*
* PyUpb_Message_Reify()
*
* The message equivalent of PyUpb_*Container_Reify(), this transitions
* the wrapper from the unset state (owning a reference on self->ptr.parent) to
* the set state (having a non-owning pointer to self->ptr.msg).
*/
static void PyUpb_Message_Reify(PyUpb_Message* self, const upb_FieldDef* f,
upb_Message* msg) {
assert(f == PyUpb_Message_GetFieldDef(self));
if (!msg) {
const upb_MessageDef* msgdef = PyUpb_Message_GetMsgdef((PyObject*)self);
const upb_MiniTable* layout = upb_MessageDef_MiniTable(msgdef);
msg = upb_Message_New(layout, PyUpb_Arena_Get(self->arena));
}
PyUpb_ObjCache_Add(msg, &self->ob_base);
Py_DECREF(&self->ptr.parent->ob_base);
self->ptr.msg = msg; // Overwrites self->ptr.parent
self->def = (uintptr_t)upb_FieldDef_MessageSubDef(f);
PyUpb_Message_SyncSubobjs(self);
}
/*
* PyUpb_Message_SyncSubobjs()
*
* This operation must be invoked whenever the underlying upb_Message has been
* mutated directly in C. This will attach any newly-present field data
* to previously returned stub wrapper objects.
*
* For example:
* foo = FooMessage()
* sub = foo.submsg # Empty, unset sub-message
*
* # SyncSubobjs() is required to connect our existing 'sub' wrapper to the
* # newly created foo.submsg data in C.
* foo.MergeFrom(FooMessage(submsg={}))
*
* This requires that all of the new sub-objects that have appeared are owned
* by `self`'s arena.
*/
static void PyUpb_Message_SyncSubobjs(PyUpb_Message* self) {
PyUpb_WeakMap* subobj_map = self->unset_subobj_map;
if (!subobj_map) return;
upb_Message* msg = PyUpb_Message_GetMsg(self);
intptr_t iter = PYUPB_WEAKMAP_BEGIN;
const void* key;
PyObject* obj;
// The last ref to this message could disappear during iteration.
// When we call PyUpb_*Container_Reify() below, the container will drop
// its ref on `self`. If that was the last ref on self, the object will be
// deleted, and `subobj_map` along with it. We need it to live until we are
// done iterating.
Py_INCREF(&self->ob_base);
while (PyUpb_WeakMap_Next(subobj_map, &key, &obj, &iter)) {
const upb_FieldDef* f = key;
if (upb_FieldDef_HasPresence(f) && !upb_Message_HasFieldByDef(msg, f))
continue;
upb_MessageValue msgval = upb_Message_GetFieldByDef(msg, f);
PyUpb_WeakMap_DeleteIter(subobj_map, &iter);
if (upb_FieldDef_IsMap(f)) {
if (!msgval.map_val) continue;
PyUpb_MapContainer_Reify(obj, (upb_Map*)msgval.map_val);
} else if (upb_FieldDef_IsRepeated(f)) {
if (!msgval.array_val) continue;
PyUpb_RepeatedContainer_Reify(obj, (upb_Array*)msgval.array_val);
} else {
PyUpb_Message* sub = (void*)obj;
assert(self == sub->ptr.parent);
PyUpb_Message_Reify(sub, f, (upb_Message*)msgval.msg_val);
}
}
Py_DECREF(&self->ob_base);
// TODO: present fields need to be iterated too if they can reach
// a WeakMap.
}
static PyObject* PyUpb_Message_ToString(PyUpb_Message* self) {
if (PyUpb_Message_IsStub(self)) {
return PyUnicode_FromStringAndSize(NULL, 0);
}
upb_Message* msg = PyUpb_Message_GetMsg(self);
const upb_MessageDef* msgdef = _PyUpb_Message_GetMsgdef(self);
const upb_DefPool* symtab = upb_FileDef_Pool(upb_MessageDef_File(msgdef));
char buf[1024];
int options = UPB_TXTENC_SKIPUNKNOWN;
size_t size = upb_TextEncode(msg, msgdef, symtab, options, buf, sizeof(buf));
if (size < sizeof(buf)) {
return PyUnicode_FromStringAndSize(buf, size);
} else {
char* buf2 = malloc(size + 1);
size_t size2 = upb_TextEncode(msg, msgdef, symtab, options, buf2, size + 1);
assert(size == size2);
PyObject* ret = PyUnicode_FromStringAndSize(buf2, size2);
free(buf2);
return ret;
}
}
static PyObject* PyUpb_Message_RichCompare(PyObject* _self, PyObject* other,
int opid) {
PyUpb_Message* self = (void*)_self;
if (opid != Py_EQ && opid != Py_NE) {
Py_INCREF(Py_NotImplemented);
return Py_NotImplemented;
}
if (!PyObject_TypeCheck(other, Py_TYPE(self))) {
Py_INCREF(Py_NotImplemented);
return Py_NotImplemented;
}
bool ret = PyUpb_Message_IsEqual(self, other);
if (opid == Py_NE) ret = !ret;
return PyBool_FromLong(ret);
}
void PyUpb_Message_CacheDelete(PyObject* _self, const upb_FieldDef* f) {
PyUpb_Message* self = (void*)_self;
PyUpb_WeakMap_Delete(self->unset_subobj_map, f);
}
void PyUpb_Message_SetConcreteSubobj(PyObject* _self, const upb_FieldDef* f,
upb_MessageValue subobj) {
PyUpb_Message* self = (void*)_self;
PyUpb_Message_EnsureReified(self);
PyUpb_Message_CacheDelete(_self, f);
upb_Message_SetFieldByDef(self->ptr.msg, f, subobj,
PyUpb_Arena_Get(self->arena));
}
static void PyUpb_Message_Dealloc(PyObject* _self) {
PyUpb_Message* self = (void*)_self;
if (PyUpb_Message_IsStub(self)) {
PyUpb_Message_CacheDelete((PyObject*)self->ptr.parent,
PyUpb_Message_GetFieldDef(self));
Py_DECREF(self->ptr.parent);
} else {
PyUpb_ObjCache_Delete(self->ptr.msg);
}
if (self->unset_subobj_map) {
PyUpb_WeakMap_Free(self->unset_subobj_map);
}
Py_DECREF(self->arena);
// We do not use PyUpb_Dealloc() here because Message is a base type and for
// base types there is a bug we have to work around in this case (see below).
PyTypeObject* tp = Py_TYPE(self);
freefunc tp_free = PyType_GetSlot(tp, Py_tp_free);
tp_free(self);
if (cpython_bits.python_version_hex >= 0x03080000) {
// Prior to Python 3.8 there is a bug where deallocating the type here would
// lead to a double-decref: https://bugs.python.org/issue37879
Py_DECREF(tp);
}
}
PyObject* PyUpb_Message_Get(upb_Message* u_msg, const upb_MessageDef* m,
PyObject* arena) {
PyObject* ret = PyUpb_ObjCache_Get(u_msg);
if (ret) return ret;
PyObject* cls = PyUpb_Descriptor_GetClass(m);
// It is not safe to use PyObject_{,GC}_New() due to:
// https://bugs.python.org/issue35810
PyUpb_Message* py_msg = (void*)PyType_GenericAlloc((PyTypeObject*)cls, 0);
py_msg->arena = arena;
py_msg->def = (uintptr_t)m;
py_msg->ptr.msg = u_msg;
py_msg->unset_subobj_map = NULL;
py_msg->ext_dict = NULL;
py_msg->version = 0;
ret = &py_msg->ob_base;
Py_DECREF(cls);
Py_INCREF(arena);
PyUpb_ObjCache_Add(u_msg, ret);
return ret;
}
/* PyUpb_Message_GetStub()
*
* Non-present messages return "stub" objects that point to their parent, but
* will materialize into real upb objects if they are mutated.
*
* Note: we do *not* create stubs for repeated/map fields unless the parent
* is a stub:
*
* msg = TestMessage()
* msg.submessage # (A) Creates a stub
* msg.repeated_foo # (B) Does *not* create a stub
* msg.submessage.repeated_bar # (C) Creates a stub
*
* In case (B) we have some freedom: we could either create a stub, or create
* a reified object with underlying data. It appears that either could work
* equally well, with no observable change to users. There isn't a clear
* advantage to either choice. We choose to follow the behavior of the
* pre-existing C++ behavior for consistency, but if it becomes apparent that
* there would be some benefit to reversing this decision, it should be totally
* within the realm of possibility.
*/
PyObject* PyUpb_Message_GetStub(PyUpb_Message* self,
const upb_FieldDef* field) {
PyObject* _self = (void*)self;
if (!self->unset_subobj_map) {
self->unset_subobj_map = PyUpb_WeakMap_New();
}
PyObject* subobj = PyUpb_WeakMap_Get(self->unset_subobj_map, field);
if (subobj) return subobj;
if (upb_FieldDef_IsMap(field)) {
subobj = PyUpb_MapContainer_NewStub(_self, field, self->arena);
} else if (upb_FieldDef_IsRepeated(field)) {
subobj = PyUpb_RepeatedContainer_NewStub(_self, field, self->arena);
} else {
subobj = PyUpb_Message_NewStub(&self->ob_base, field, self->arena);
}
PyUpb_WeakMap_Add(self->unset_subobj_map, field, subobj);
assert(!PyErr_Occurred());
return subobj;
}
PyObject* PyUpb_Message_GetPresentWrapper(PyUpb_Message* self,
const upb_FieldDef* field) {
assert(!PyUpb_Message_IsStub(self));
upb_MutableMessageValue mutval =
upb_Message_Mutable(self->ptr.msg, field, PyUpb_Arena_Get(self->arena));
if (upb_FieldDef_IsMap(field)) {
return PyUpb_MapContainer_GetOrCreateWrapper(mutval.map, field,
self->arena);
} else {
return PyUpb_RepeatedContainer_GetOrCreateWrapper(mutval.array, field,
self->arena);
}
}
PyObject* PyUpb_Message_GetScalarValue(PyUpb_Message* self,
const upb_FieldDef* field) {
upb_MessageValue val;
if (PyUpb_Message_IsStub(self)) {
// Unset message always returns default values.
val = upb_FieldDef_Default(field);
} else {
val = upb_Message_GetFieldByDef(self->ptr.msg, field);
}
return PyUpb_UpbToPy(val, field, self->arena);
}
/*
* PyUpb_Message_GetFieldValue()
*
* Implements the equivalent of getattr(msg, field), once `field` has
* already been resolved to a `upb_FieldDef*`.
*
* This may involve constructing a wrapper object for the given field, or
* returning one that was previously constructed. If the field is not actually
* set, the wrapper object will be an "unset" object that is not actually
* connected to any C data.
*/
PyObject* PyUpb_Message_GetFieldValue(PyObject* _self,
const upb_FieldDef* field) {
PyUpb_Message* self = (void*)_self;
assert(upb_FieldDef_ContainingType(field) == PyUpb_Message_GetMsgdef(_self));
bool submsg = upb_FieldDef_IsSubMessage(field);
bool seq = upb_FieldDef_IsRepeated(field);
if ((PyUpb_Message_IsStub(self) && (submsg || seq)) ||
(submsg && !seq && !upb_Message_HasFieldByDef(self->ptr.msg, field))) {
return PyUpb_Message_GetStub(self, field);
} else if (seq) {
return PyUpb_Message_GetPresentWrapper(self, field);
} else {
return PyUpb_Message_GetScalarValue(self, field);
}
}
int PyUpb_Message_SetFieldValue(PyObject* _self, const upb_FieldDef* field,
PyObject* value, PyObject* exc) {
PyUpb_Message* self = (void*)_self;
assert(value);
if (upb_FieldDef_IsSubMessage(field) || upb_FieldDef_IsRepeated(field)) {
PyErr_Format(exc,
"Assignment not allowed to message, map, or repeated "
"field \"%s\" in protocol message object.",
upb_FieldDef_Name(field));
return -1;
}
PyUpb_Message_EnsureReified(self);
upb_MessageValue val;
upb_Arena* arena = PyUpb_Arena_Get(self->arena);
if (!PyUpb_PyToUpb(value, field, &val, arena)) {
return -1;
}
upb_Message_SetFieldByDef(self->ptr.msg, field, val, arena);
return 0;
}
int PyUpb_Message_GetVersion(PyObject* _self) {
PyUpb_Message* self = (void*)_self;
return self->version;
}
/*
* PyUpb_Message_GetAttr()
*
* Implements:
* foo = msg.foo
*
* Attribute lookup must find both message fields and base class methods like
* msg.SerializeToString().
*/
__attribute__((flatten)) static PyObject* PyUpb_Message_GetAttr(
PyObject* _self, PyObject* attr) {
PyUpb_Message* self = (void*)_self;
// Lookup field by name.
const upb_FieldDef* field;
if (PyUpb_Message_LookupName(self, attr, &field, NULL, NULL)) {
return PyUpb_Message_GetFieldValue(_self, field);
}
// Check base class attributes.
assert(!PyErr_Occurred());
PyObject* ret = PyObject_GenericGetAttr(_self, attr);
if (ret) return ret;
// Swallow AttributeError if it occurred and try again on the metaclass
// to pick up class attributes. But we have to special-case "Extensions"
// which affirmatively returns AttributeError when a message is not
// extendable.
const char* name;
if (PyErr_ExceptionMatches(PyExc_AttributeError) &&
(name = PyUpb_GetStrData(attr)) && strcmp(name, "Extensions") != 0) {
PyErr_Clear();
return PyUpb_MessageMeta_GetAttr((PyObject*)Py_TYPE(_self), attr);
}
return NULL;
}
/*
* PyUpb_Message_SetAttr()
*
* Implements:
* msg.foo = foo
*/
static int PyUpb_Message_SetAttr(PyObject* _self, PyObject* attr,
PyObject* value) {
PyUpb_Message* self = (void*)_self;
if (value == NULL) {
PyErr_SetString(PyExc_AttributeError, "Cannot delete field attribute");
return -1;
}
const upb_FieldDef* field;
if (!PyUpb_Message_LookupName(self, attr, &field, NULL,
PyExc_AttributeError)) {
return -1;
}
return PyUpb_Message_SetFieldValue(_self, field, value, PyExc_AttributeError);
}
static PyObject* PyUpb_Message_HasField(PyObject* _self, PyObject* arg) {
PyUpb_Message* self = (void*)_self;
const upb_FieldDef* field;
const upb_OneofDef* oneof;
if (!PyUpb_Message_LookupName(self, arg, &field, &oneof, PyExc_ValueError)) {
return NULL;
}
if (field && !upb_FieldDef_HasPresence(field)) {
PyErr_Format(PyExc_ValueError, "Field %s does not have presence.",
upb_FieldDef_FullName(field));
return NULL;
}
if (PyUpb_Message_IsStub(self)) Py_RETURN_FALSE;
return PyBool_FromLong(field ? upb_Message_HasFieldByDef(self->ptr.msg, field)
: upb_Message_WhichOneof(self->ptr.msg, oneof) !=
NULL);
}
static PyObject* PyUpb_Message_Contains(PyObject* _self, PyObject* arg) {
const upb_MessageDef* msgdef = PyUpb_Message_GetMsgdef(_self);
switch (upb_MessageDef_WellKnownType(msgdef)) {
case kUpb_WellKnown_Struct: {
// For WKT Struct, check if the key is in the fields.
PyUpb_Message* self = (void*)_self;
if (PyUpb_Message_IsStub(self)) Py_RETURN_FALSE;
upb_Message* msg = PyUpb_Message_GetMsg(self);
const upb_FieldDef* f = upb_MessageDef_FindFieldByName(msgdef, "fields");
const upb_Map* map = upb_Message_GetFieldByDef(msg, f).map_val;
const upb_MessageDef* entry_m = upb_FieldDef_MessageSubDef(f);
const upb_FieldDef* key_f = upb_MessageDef_Field(entry_m, 0);
upb_MessageValue u_key;
if (!PyUpb_PyToUpb(arg, key_f, &u_key, NULL)) return NULL;
return PyBool_FromLong(upb_Map_Get(map, u_key, NULL));
}
case kUpb_WellKnown_ListValue: {
// For WKT ListValue, check if the key is in the items.
PyUpb_Message* self = (void*)_self;
if (PyUpb_Message_IsStub(self)) Py_RETURN_FALSE;
PyObject* items = PyObject_CallMethod(_self, "items", NULL);
return PyBool_FromLong(PySequence_Contains(items, arg));
}
default:
// For other messages, check with HasField.
return PyUpb_Message_HasField(_self, arg);
}
}
static PyObject* PyUpb_Message_FindInitializationErrors(PyObject* _self,
PyObject* arg);
static PyObject* PyUpb_Message_IsInitializedAppendErrors(PyObject* _self,
PyObject* errors) {
PyObject* list = PyUpb_Message_FindInitializationErrors(_self, NULL);
if (!list) return NULL;
bool ok = PyList_Size(list) == 0;
PyObject* ret = NULL;
PyObject* extend_result = NULL;
if (!ok) {
extend_result = PyObject_CallMethod(errors, "extend", "O", list);
if (!extend_result) goto done;
}
ret = PyBool_FromLong(ok);
done:
Py_XDECREF(list);
Py_XDECREF(extend_result);
return ret;
}
static PyObject* PyUpb_Message_IsInitialized(PyObject* _self, PyObject* args) {
PyObject* errors = NULL;
if (!PyArg_ParseTuple(args, "|O", &errors)) {
return NULL;
}
if (errors) {
// We need to collect a list of unset required fields and append it to
// `errors`.
return PyUpb_Message_IsInitializedAppendErrors(_self, errors);
} else {
// We just need to return a boolean "true" or "false" for whether all
// required fields are set.
upb_Message* msg = PyUpb_Message_GetIfReified(_self);
const upb_MessageDef* m = PyUpb_Message_GetMsgdef(_self);
const upb_DefPool* symtab = upb_FileDef_Pool(upb_MessageDef_File(m));
bool initialized = !upb_util_HasUnsetRequired(msg, m, symtab, NULL);
return PyBool_FromLong(initialized);
}
}
static PyObject* PyUpb_Message_ListFieldsItemKey(PyObject* self,
PyObject* val) {
assert(PyTuple_Check(val));
PyObject* field = PyTuple_GetItem(val, 0);
const upb_FieldDef* f = PyUpb_FieldDescriptor_GetDef(field);
return PyLong_FromLong(upb_FieldDef_Number(f));
}
static PyObject* PyUpb_Message_CheckCalledFromGeneratedFile(
PyObject* unused, PyObject* unused_arg) {
PyErr_SetString(
PyExc_TypeError,
"Descriptors cannot be created directly.\n"
"If this call came from a _pb2.py file, your generated code is out of "
"date and must be regenerated with protoc >= 3.19.0.\n"
"If you cannot immediately regenerate your protos, some other possible "
"workarounds are:\n"
" 1. Downgrade the protobuf package to 3.20.x or lower.\n"
" 2. Set PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION=python (but this will "
"use pure-Python parsing and will be much slower).\n"
"\n"
"More information: "
"https://developers.google.com/protocol-buffers/docs/news/"
"2022-05-06#python-updates");
return NULL;
}
static bool PyUpb_Message_SortFieldList(PyObject* list) {
PyUpb_ModuleState* state = PyUpb_ModuleState_Get();
bool ok = false;
PyObject* args = PyTuple_New(0);
PyObject* kwargs = PyDict_New();
PyObject* method = PyObject_GetAttrString(list, "sort");
PyObject* call_result = NULL;
if (!args || !kwargs || !method) goto err;
if (PyDict_SetItemString(kwargs, "key", state->listfields_item_key) < 0) {
goto err;
}
call_result = PyObject_Call(method, args, kwargs);
if (!call_result) goto err;
ok = true;
err:
Py_XDECREF(method);
Py_XDECREF(args);
Py_XDECREF(kwargs);
Py_XDECREF(call_result);
return ok;
}
static PyObject* PyUpb_Message_ListFields(PyObject* _self, PyObject* arg) {
PyObject* list = PyList_New(0);
upb_Message* msg = PyUpb_Message_GetIfReified(_self);
if (!msg) return list;
size_t iter1 = kUpb_Message_Begin;
const upb_MessageDef* m = PyUpb_Message_GetMsgdef(_self);
const upb_DefPool* symtab = upb_FileDef_Pool(upb_MessageDef_File(m));
const upb_FieldDef* f;
PyObject* field_desc = NULL;
PyObject* py_val = NULL;
PyObject* tuple = NULL;
upb_MessageValue val;
uint32_t last_field = 0;
bool in_order = true;
while (upb_Message_Next(msg, m, symtab, &f, &val, &iter1)) {
const uint32_t field_number = upb_FieldDef_Number(f);
if (field_number < last_field) in_order = false;
last_field = field_number;
PyObject* field_desc = PyUpb_FieldDescriptor_Get(f);
PyObject* py_val = PyUpb_Message_GetFieldValue(_self, f);
if (!field_desc || !py_val) goto err;
PyObject* tuple = Py_BuildValue("(NN)", field_desc, py_val);
field_desc = NULL;
py_val = NULL;
if (!tuple) goto err;
if (PyList_Append(list, tuple)) goto err;
Py_DECREF(tuple);
tuple = NULL;
}
// Users rely on fields being returned in field number order.
if (!in_order && !PyUpb_Message_SortFieldList(list)) goto err;
return list;
err:
Py_XDECREF(field_desc);
Py_XDECREF(py_val);
Py_XDECREF(tuple);
Py_DECREF(list);
return NULL;
}
PyObject* PyUpb_Message_MergeFrom(PyObject* self, PyObject* arg) {
if (self->ob_type != arg->ob_type) {
PyErr_Format(PyExc_TypeError,
"Parameter to MergeFrom() must be instance of same class: "
"expected %S got %S.",
Py_TYPE(self), Py_TYPE(arg));
return NULL;
}
// OPT: exit if src is empty.
PyObject* subargs = PyTuple_New(0);
PyObject* serialized =
PyUpb_Message_SerializePartialToString(arg, subargs, NULL);
Py_DECREF(subargs);
if (!serialized) return NULL;
PyObject* ret = PyUpb_Message_MergeFromString(self, serialized);
Py_DECREF(serialized);
Py_XDECREF(ret);
Py_RETURN_NONE;
}
static PyObject* PyUpb_Message_Clear(PyUpb_Message* self);
static PyObject* PyUpb_Message_CopyFrom(PyObject* _self, PyObject* arg) {
if (_self->ob_type != arg->ob_type) {
PyErr_Format(PyExc_TypeError,
"Parameter to CopyFrom() must be instance of same class: "
"expected %S got %S.",
Py_TYPE(_self), Py_TYPE(arg));
return NULL;
}
if (_self == arg) {
Py_RETURN_NONE;
}
PyUpb_Message* self = (void*)_self;
PyUpb_Message* other = (void*)arg;
PyUpb_Message_EnsureReified(self);
const upb_Message* other_msg = PyUpb_Message_GetIfReified((PyObject*)other);
if (other_msg) {
upb_Message_DeepCopy(
self->ptr.msg, other_msg,
upb_MessageDef_MiniTable((const upb_MessageDef*)other->def),
PyUpb_Arena_Get(self->arena));
} else {
PyObject* tmp = PyUpb_Message_Clear(self);
Py_DECREF(tmp);
}
PyUpb_Message_SyncSubobjs(self);
Py_RETURN_NONE;
}
static PyObject* PyUpb_Message_SetInParent(PyObject* _self, PyObject* arg) {
PyUpb_Message* self = (void*)_self;
PyUpb_Message_EnsureReified(self);
Py_RETURN_NONE;
}
static PyObject* PyUpb_Message_UnknownFields(PyObject* _self, PyObject* arg) {
// TODO: re-enable when unknown fields are added.
// return PyUpb_UnknownFields_New(_self);
PyErr_SetString(PyExc_NotImplementedError, "unknown field accessor");
return NULL;
}
PyObject* PyUpb_Message_MergeFromString(PyObject* _self, PyObject* arg) {
PyUpb_Message* self = (void*)_self;
char* buf;
Py_ssize_t size;
PyObject* bytes = NULL;
if (PyMemoryView_Check(arg)) {
bytes = PyBytes_FromObject(arg);
// Cannot fail when passed something of the correct type.
int err = PyBytes_AsStringAndSize(bytes, &buf, &size);
(void)err;
assert(err >= 0);
} else if (PyBytes_AsStringAndSize(arg, &buf, &size) < 0) {
return NULL;
}
PyUpb_Message_EnsureReified(self);
const upb_MessageDef* msgdef = _PyUpb_Message_GetMsgdef(self);
const upb_FileDef* file = upb_MessageDef_File(msgdef);
const upb_ExtensionRegistry* extreg =
upb_DefPool_ExtensionRegistry(upb_FileDef_Pool(file));
const upb_MiniTable* layout = upb_MessageDef_MiniTable(msgdef);
upb_Arena* arena = PyUpb_Arena_Get(self->arena);
PyUpb_ModuleState* state = PyUpb_ModuleState_Get();
int options =
upb_DecodeOptions_MaxDepth(state->allow_oversize_protos ? UINT16_MAX : 0);
upb_DecodeStatus status =
upb_Decode(buf, size, self->ptr.msg, layout, extreg, options, arena);
Py_XDECREF(bytes);
if (status != kUpb_DecodeStatus_Ok) {
PyErr_Format(state->decode_error_class, "Error parsing message");
return NULL;
}
PyUpb_Message_SyncSubobjs(self);
return PyLong_FromSsize_t(size);
}
static PyObject* PyUpb_Message_ParseFromString(PyObject* self, PyObject* arg) {
PyObject* tmp = PyUpb_Message_Clear((PyUpb_Message*)self);
Py_DECREF(tmp);
return PyUpb_Message_MergeFromString(self, arg);
}
static PyObject* PyUpb_Message_ByteSize(PyObject* self, PyObject* args) {
// TODO: At the
// moment upb does not have a "byte size" function, so we just serialize to
// string and get the size of the string.
PyObject* subargs = PyTuple_New(0);
PyObject* serialized = PyUpb_Message_SerializeToString(self, subargs, NULL);
Py_DECREF(subargs);
if (!serialized) return NULL;
size_t size = PyBytes_Size(serialized);
Py_DECREF(serialized);
return PyLong_FromSize_t(size);
}
static PyObject* PyUpb_Message_Clear(PyUpb_Message* self) {
PyUpb_Message_EnsureReified(self);
const upb_MessageDef* msgdef = _PyUpb_Message_GetMsgdef(self);
PyUpb_WeakMap* subobj_map = self->unset_subobj_map;
if (subobj_map) {
upb_Message* msg = PyUpb_Message_GetMsg(self);
(void)msg; // Suppress unused warning when asserts are disabled.
intptr_t iter = PYUPB_WEAKMAP_BEGIN;
const void* key;
PyObject* obj;
while (PyUpb_WeakMap_Next(subobj_map, &key, &obj, &iter)) {
const upb_FieldDef* f = key;
PyUpb_WeakMap_DeleteIter(subobj_map, &iter);
if (upb_FieldDef_IsMap(f)) {
assert(upb_Message_GetFieldByDef(msg, f).map_val == NULL);
PyUpb_MapContainer_Reify(obj, NULL);
} else if (upb_FieldDef_IsRepeated(f)) {
assert(upb_Message_GetFieldByDef(msg, f).array_val == NULL);
PyUpb_RepeatedContainer_Reify(obj, NULL);
} else {
assert(!upb_Message_HasFieldByDef(msg, f));
PyUpb_Message* sub = (void*)obj;
assert(self == sub->ptr.parent);
PyUpb_Message_Reify(sub, f, NULL);
}
}
}
upb_Message_ClearByDef(self->ptr.msg, msgdef);
Py_RETURN_NONE;
}
void PyUpb_Message_DoClearField(PyObject* _self, const upb_FieldDef* f) {
PyUpb_Message* self = (void*)_self;
PyUpb_Message_EnsureReified((PyUpb_Message*)self);
// We must ensure that any stub object is reified so its parent no longer
// points to us.
PyObject* sub = self->unset_subobj_map
? PyUpb_WeakMap_Get(self->unset_subobj_map, f)
: NULL;
if (upb_FieldDef_IsMap(f)) {
// For maps we additionally have to invalidate any iterators. So we need
// to get an object even if it's reified.
if (!sub) {
sub = PyUpb_Message_GetFieldValue(_self, f);
}
PyUpb_MapContainer_EnsureReified(sub);
PyUpb_MapContainer_Invalidate(sub);
} else if (upb_FieldDef_IsRepeated(f)) {
if (sub) {
PyUpb_RepeatedContainer_EnsureReified(sub);
}
} else if (upb_FieldDef_IsSubMessage(f)) {
if (sub) {
PyUpb_Message_EnsureReified((PyUpb_Message*)sub);
}
}
Py_XDECREF(sub);
upb_Message_ClearFieldByDef(self->ptr.msg, f);
}
static PyObject* PyUpb_Message_ClearExtension(PyObject* _self, PyObject* arg) {
PyUpb_Message* self = (void*)_self;
PyUpb_Message_EnsureReified(self);
const upb_FieldDef* f = PyUpb_Message_GetExtensionDef(_self, arg);
if (!f) return NULL;
PyUpb_Message_DoClearField(_self, f);
Py_RETURN_NONE;
}
static PyObject* PyUpb_Message_ClearField(PyObject* _self, PyObject* arg) {
PyUpb_Message* self = (void*)_self;
// We always need EnsureReified() here (even for an unset message) to
// preserve behavior like:
// msg = FooMessage()
// msg.foo.Clear()
// assert msg.HasField("foo")
PyUpb_Message_EnsureReified(self);
const upb_FieldDef* f;
const upb_OneofDef* o;
if (!PyUpb_Message_LookupName(self, arg, &f, &o, PyExc_ValueError)) {
return NULL;
}
if (o) f = upb_Message_WhichOneof(self->ptr.msg, o);
if (f) PyUpb_Message_DoClearField(_self, f);
Py_RETURN_NONE;
}
static PyObject* PyUpb_Message_DiscardUnknownFields(PyUpb_Message* self,
PyObject* arg) {
PyUpb_Message_EnsureReified(self);
const upb_MessageDef* msgdef = _PyUpb_Message_GetMsgdef(self);
upb_Message_DiscardUnknown(self->ptr.msg, msgdef, 64);
Py_RETURN_NONE;
}
static PyObject* PyUpb_Message_FindInitializationErrors(PyObject* _self,
PyObject* arg) {
PyUpb_Message* self = (void*)_self;
upb_Message* msg = PyUpb_Message_GetIfReified(_self);
const upb_MessageDef* msgdef = _PyUpb_Message_GetMsgdef(self);
const upb_DefPool* ext_pool = upb_FileDef_Pool(upb_MessageDef_File(msgdef));
upb_FieldPathEntry* fields_base;
PyObject* ret = PyList_New(0);
if (upb_util_HasUnsetRequired(msg, msgdef, ext_pool, &fields_base)) {
upb_FieldPathEntry* fields = fields_base;
char* buf = NULL;
size_t size = 0;
assert(fields->field);
while (fields->field) {
upb_FieldPathEntry* field = fields;
size_t need = upb_FieldPath_ToText(&fields, buf, size);
if (need >= size) {
fields = field;
size = size ? size * 2 : 16;
while (size <= need) size *= 2;
buf = realloc(buf, size);
need = upb_FieldPath_ToText(&fields, buf, size);
assert(size > need);
}
PyObject* str = PyUnicode_FromString(buf);
PyList_Append(ret, str);
Py_DECREF(str);
}
free(buf);
free(fields_base);
}
return ret;
}
static PyObject* PyUpb_Message_FromString(PyObject* cls, PyObject* serialized) {
PyObject* ret = NULL;
PyObject* length = NULL;
ret = PyObject_CallObject(cls, NULL);
if (ret == NULL) goto err;
length = PyUpb_Message_MergeFromString(ret, serialized);
if (length == NULL) goto err;
done:
Py_XDECREF(length);
return ret;
err:
Py_XDECREF(ret);
ret = NULL;
goto done;
}
const upb_FieldDef* PyUpb_Message_GetExtensionDef(PyObject* _self,
PyObject* key) {
const upb_FieldDef* f = PyUpb_FieldDescriptor_GetDef(key);
if (!f) {
PyErr_Clear();
PyErr_Format(PyExc_KeyError, "Object %R is not a field descriptor\n", key);
return NULL;
}
if (!upb_FieldDef_IsExtension(f)) {
PyErr_Format(PyExc_KeyError, "Field %s is not an extension\n",
upb_FieldDef_FullName(f));
return NULL;
}
const upb_MessageDef* msgdef = PyUpb_Message_GetMsgdef(_self);
if (upb_FieldDef_ContainingType(f) != msgdef) {
PyErr_Format(PyExc_KeyError, "Extension doesn't match (%s vs %s)",
upb_MessageDef_FullName(msgdef), upb_FieldDef_FullName(f));
return NULL;
}
return f;
}
static PyObject* PyUpb_Message_HasExtension(PyObject* _self,
PyObject* ext_desc) {
upb_Message* msg = PyUpb_Message_GetIfReified(_self);
const upb_FieldDef* f = PyUpb_Message_GetExtensionDef(_self, ext_desc);
if (!f) return NULL;
if (upb_FieldDef_IsRepeated(f)) {
PyErr_SetString(PyExc_KeyError,
"Field is repeated. A singular method is required.");
return NULL;
}
if (!msg) Py_RETURN_FALSE;
return PyBool_FromLong(upb_Message_HasFieldByDef(msg, f));
}
void PyUpb_Message_ReportInitializationErrors(const upb_MessageDef* msgdef,
PyObject* errors, PyObject* exc) {
PyObject* comma = PyUnicode_FromString(",");
PyObject* missing_fields = NULL;
if (!comma) goto done;
missing_fields = PyUnicode_Join(comma, errors);
if (!missing_fields) goto done;
PyErr_Format(exc, "Message %s is missing required fields: %U",
upb_MessageDef_FullName(msgdef), missing_fields);
done:
Py_XDECREF(comma);
Py_XDECREF(missing_fields);
Py_DECREF(errors);
}
PyObject* PyUpb_Message_SerializeInternal(PyObject* _self, PyObject* args,
PyObject* kwargs,
bool check_required) {
PyUpb_Message* self = (void*)_self;
if (!PyUpb_Message_Verify((PyObject*)self)) return NULL;
static const char* kwlist[] = {"deterministic", NULL};
int deterministic = 0;
if (!PyArg_ParseTupleAndKeywords(args, kwargs, "|p", (char**)(kwlist),
&deterministic)) {
return NULL;
}
const upb_MessageDef* msgdef = _PyUpb_Message_GetMsgdef(self);
if (PyUpb_Message_IsStub(self)) {
// Nothing to serialize, but we do have to check whether the message is
// initialized.
PyUpb_ModuleState* state = PyUpb_ModuleState_Get();
PyObject* errors = PyUpb_Message_FindInitializationErrors(_self, NULL);
if (!errors) return NULL;
if (PyList_Size(errors) == 0) {
Py_DECREF(errors);
return PyBytes_FromStringAndSize(NULL, 0);
}
PyUpb_Message_ReportInitializationErrors(msgdef, errors,
state->encode_error_class);
return NULL;
}
upb_Arena* arena = upb_Arena_New();
const upb_MiniTable* layout = upb_MessageDef_MiniTable(msgdef);
size_t size = 0;
// Python does not currently have any effective limit on serialization depth.
int options = upb_EncodeOptions_MaxDepth(UINT16_MAX);
if (check_required) options |= kUpb_EncodeOption_CheckRequired;
if (deterministic) options |= kUpb_EncodeOption_Deterministic;
char* pb;
upb_EncodeStatus status =
upb_Encode(self->ptr.msg, layout, options, arena, &pb, &size);
PyObject* ret = NULL;
if (status != kUpb_EncodeStatus_Ok) {
PyUpb_ModuleState* state = PyUpb_ModuleState_Get();
PyObject* errors = PyUpb_Message_FindInitializationErrors(_self, NULL);
if (PyList_Size(errors) != 0) {
PyUpb_Message_ReportInitializationErrors(msgdef, errors,
state->encode_error_class);
} else {
PyErr_Format(state->encode_error_class, "Failed to serialize proto");
}
goto done;
}
ret = PyBytes_FromStringAndSize(pb, size);
done:
upb_Arena_Free(arena);
return ret;
}
PyObject* PyUpb_Message_SerializeToString(PyObject* _self, PyObject* args,
PyObject* kwargs) {
return PyUpb_Message_SerializeInternal(_self, args, kwargs, true);
}
PyObject* PyUpb_Message_SerializePartialToString(PyObject* _self,
PyObject* args,
PyObject* kwargs) {
return PyUpb_Message_SerializeInternal(_self, args, kwargs, false);
}
static PyObject* PyUpb_Message_WhichOneof(PyObject* _self, PyObject* name) {
PyUpb_Message* self = (void*)_self;
const upb_OneofDef* o;
if (!PyUpb_Message_LookupName(self, name, NULL, &o, PyExc_ValueError)) {
return NULL;
}
upb_Message* msg = PyUpb_Message_GetIfReified(_self);
if (!msg) Py_RETURN_NONE;
const upb_FieldDef* f = upb_Message_WhichOneof(msg, o);
if (!f) Py_RETURN_NONE;
return PyUnicode_FromString(upb_FieldDef_Name(f));
}
PyObject* DeepCopy(PyObject* _self, PyObject* arg) {
PyUpb_Message* self = (void*)_self;
const upb_MessageDef* def = PyUpb_Message_GetMsgdef(_self);
const upb_MiniTable* mini_table = upb_MessageDef_MiniTable(def);
upb_Message* msg = PyUpb_Message_GetIfReified(_self);
PyObject* arena = PyUpb_Arena_New();
upb_Arena* upb_arena = PyUpb_Arena_Get(arena);
upb_Message* clone = msg ? upb_Message_DeepClone(msg, mini_table, upb_arena)
: upb_Message_New(mini_table, upb_arena);
PyObject* ret = PyUpb_Message_Get(clone, def, arena);
Py_DECREF(arena);
return ret;
}
void PyUpb_Message_ClearExtensionDict(PyObject* _self) {
PyUpb_Message* self = (void*)_self;
assert(self->ext_dict);
self->ext_dict = NULL;
}
static PyObject* PyUpb_Message_GetExtensionDict(PyObject* _self,
void* closure) {
PyUpb_Message* self = (void*)_self;
if (self->ext_dict) {
Py_INCREF(self->ext_dict);
return self->ext_dict;
}
const upb_MessageDef* m = _PyUpb_Message_GetMsgdef(self);
if (upb_MessageDef_ExtensionRangeCount(m) == 0) {
PyErr_SetNone(PyExc_AttributeError);
return NULL;
}
self->ext_dict = PyUpb_ExtensionDict_New(_self);
return self->ext_dict;
}
static PyGetSetDef PyUpb_Message_Getters[] = {
{"Extensions", PyUpb_Message_GetExtensionDict, NULL, "Extension dict"},
{NULL}};
static PyMethodDef PyUpb_Message_Methods[] = {
{"__deepcopy__", (PyCFunction)DeepCopy, METH_VARARGS,
"Makes a deep copy of the class."},
// TODO
//{ "__unicode__", (PyCFunction)ToUnicode, METH_NOARGS,
// "Outputs a unicode representation of the message." },
{"__contains__", PyUpb_Message_Contains, METH_O,
"Checks if a message field is set."},
{"ByteSize", (PyCFunction)PyUpb_Message_ByteSize, METH_NOARGS,
"Returns the size of the message in bytes."},
{"Clear", (PyCFunction)PyUpb_Message_Clear, METH_NOARGS,
"Clears the message."},
{"ClearExtension", PyUpb_Message_ClearExtension, METH_O,
"Clears a message field."},
{"ClearField", PyUpb_Message_ClearField, METH_O, "Clears a message field."},
{"CopyFrom", PyUpb_Message_CopyFrom, METH_O,
"Copies a protocol message into the current message."},
{"DiscardUnknownFields", (PyCFunction)PyUpb_Message_DiscardUnknownFields,
METH_NOARGS, "Discards the unknown fields."},
{"FindInitializationErrors", PyUpb_Message_FindInitializationErrors,
METH_NOARGS, "Finds unset required fields."},
{"FromString", PyUpb_Message_FromString, METH_O | METH_CLASS,
"Creates new method instance from given serialized data."},
{"HasExtension", PyUpb_Message_HasExtension, METH_O,
"Checks if a message field is set."},
{"HasField", PyUpb_Message_HasField, METH_O,
"Checks if a message field is set."},
{"IsInitialized", PyUpb_Message_IsInitialized, METH_VARARGS,
"Checks if all required fields of a protocol message are set."},
{"ListFields", PyUpb_Message_ListFields, METH_NOARGS,
"Lists all set fields of a message."},
{"MergeFrom", PyUpb_Message_MergeFrom, METH_O,
"Merges a protocol message into the current message."},
{"MergeFromString", PyUpb_Message_MergeFromString, METH_O,
"Merges a serialized message into the current message."},
{"ParseFromString", PyUpb_Message_ParseFromString, METH_O,
"Parses a serialized message into the current message."},
{"SerializePartialToString",
(PyCFunction)PyUpb_Message_SerializePartialToString,
METH_VARARGS | METH_KEYWORDS,
"Serializes the message to a string, even if it isn't initialized."},
{"SerializeToString", (PyCFunction)PyUpb_Message_SerializeToString,
METH_VARARGS | METH_KEYWORDS,
"Serializes the message to a string, only for initialized messages."},
{"SetInParent", (PyCFunction)PyUpb_Message_SetInParent, METH_NOARGS,
"Sets the has bit of the given field in its parent message."},
{"UnknownFields", (PyCFunction)PyUpb_Message_UnknownFields, METH_NOARGS,
"Parse unknown field set"},
{"WhichOneof", PyUpb_Message_WhichOneof, METH_O,
"Returns the name of the field set inside a oneof, "
"or None if no field is set."},
{"_ListFieldsItemKey", PyUpb_Message_ListFieldsItemKey,
METH_O | METH_STATIC,
"Compares ListFields() list entries by field number"},
{"_CheckCalledFromGeneratedFile",
PyUpb_Message_CheckCalledFromGeneratedFile, METH_NOARGS | METH_STATIC,
"Raises TypeError if the caller is not in a _pb2.py file."},
{NULL, NULL}};
static PyType_Slot PyUpb_Message_Slots[] = {
{Py_tp_dealloc, PyUpb_Message_Dealloc},
{Py_tp_doc, "A ProtocolMessage"},
{Py_tp_getattro, PyUpb_Message_GetAttr},
{Py_tp_getset, PyUpb_Message_Getters},
{Py_tp_hash, PyObject_HashNotImplemented},
{Py_tp_methods, PyUpb_Message_Methods},
{Py_tp_new, PyUpb_Message_New},
{Py_tp_str, PyUpb_Message_ToString},
{Py_tp_repr, PyUpb_Message_ToString},
{Py_tp_richcompare, PyUpb_Message_RichCompare},
{Py_tp_setattro, PyUpb_Message_SetAttr},
{Py_tp_init, PyUpb_Message_Init},
{0, NULL}};
PyType_Spec PyUpb_Message_Spec = {
PYUPB_MODULE_NAME ".Message", // tp_name
sizeof(PyUpb_Message), // tp_basicsize
0, // tp_itemsize
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, // tp_flags
PyUpb_Message_Slots,
};
// -----------------------------------------------------------------------------
// MessageMeta
// -----------------------------------------------------------------------------
// MessageMeta is the metaclass for message objects. The generated code uses it
// to construct message classes, ie.
//
// FooMessage = _message.MessageMeta('FooMessage', (_message.Message), {...})
//
// (This is not quite true: at the moment the Python library subclasses
// MessageMeta, and uses that subclass as the metaclass. There is a TODO below
// to simplify this, so that the illustration above is indeed accurate).
typedef struct {
const upb_MiniTable* layout;
PyObject* py_message_descriptor;
} PyUpb_MessageMeta;
// The PyUpb_MessageMeta struct is trailing data tacked onto the end of
// MessageMeta instances. This means that we get our instances of this struct
// by adding the appropriate number of bytes.
static PyUpb_MessageMeta* PyUpb_GetMessageMeta(PyObject* cls) {
#ifndef NDEBUG
PyUpb_ModuleState* state = PyUpb_ModuleState_MaybeGet();
assert(!state || cls->ob_type == state->message_meta_type);
#endif
return (PyUpb_MessageMeta*)((char*)cls + cpython_bits.type_basicsize);
}
static const upb_MessageDef* PyUpb_MessageMeta_GetMsgdef(PyObject* cls) {
PyUpb_MessageMeta* self = PyUpb_GetMessageMeta(cls);
return PyUpb_Descriptor_GetDef(self->py_message_descriptor);
}
PyObject* PyUpb_MessageMeta_DoCreateClass(PyObject* py_descriptor,
const char* name, PyObject* dict) {
PyUpb_ModuleState* state = PyUpb_ModuleState_Get();
PyTypeObject* descriptor_type = state->descriptor_types[kPyUpb_Descriptor];
if (!PyObject_TypeCheck(py_descriptor, descriptor_type)) {
return PyErr_Format(PyExc_TypeError, "Expected a message Descriptor");
}
const upb_MessageDef* msgdef = PyUpb_Descriptor_GetDef(py_descriptor);
assert(msgdef);
assert(!PyUpb_ObjCache_Get(upb_MessageDef_MiniTable(msgdef)));
PyObject* slots = PyTuple_New(0);
if (!slots) return NULL;
int status = PyDict_SetItemString(dict, "__slots__", slots);
Py_DECREF(slots);
if (status < 0) return NULL;
// Bases are either:
// (Message, Message) # for regular messages
// (Message, Message, WktBase) # For well-known types
PyObject* wkt_bases = PyUpb_GetWktBases(state);
PyObject* wkt_base =
PyDict_GetItemString(wkt_bases, upb_MessageDef_FullName(msgdef));
PyObject* args;
if (wkt_base == NULL) {
args = Py_BuildValue("s(OO)O", name, state->cmessage_type,
state->message_class, dict);
} else {
args = Py_BuildValue("s(OOO)O", name, state->cmessage_type,
state->message_class, wkt_base, dict);
}
PyObject* ret = cpython_bits.type_new(state->message_meta_type, args, NULL);
Py_DECREF(args);
if (!ret) return NULL;
PyUpb_MessageMeta* meta = PyUpb_GetMessageMeta(ret);
meta->py_message_descriptor = py_descriptor;
meta->layout = upb_MessageDef_MiniTable(msgdef);
Py_INCREF(meta->py_message_descriptor);
PyUpb_Descriptor_SetClass(py_descriptor, ret);
PyUpb_ObjCache_Add(meta->layout, ret);
return ret;
}
static PyObject* PyUpb_MessageMeta_New(PyTypeObject* type, PyObject* args,
PyObject* kwargs) {
PyUpb_ModuleState* state = PyUpb_ModuleState_Get();
static const char* kwlist[] = {"name", "bases", "dict", 0};
PyObject *bases, *dict;
const char* name;
// Check arguments: (name, bases, dict)
if (!PyArg_ParseTupleAndKeywords(args, kwargs, "sO!O!:type", (char**)kwlist,
&name, &PyTuple_Type, &bases, &PyDict_Type,
&dict)) {
return NULL;
}
// Check bases: only (), or (message.Message,) are allowed
Py_ssize_t size = PyTuple_Size(bases);
if (!(size == 0 ||
(size == 1 && PyTuple_GetItem(bases, 0) == state->message_class))) {
PyErr_Format(PyExc_TypeError,
"A Message class can only inherit from Message, not %S",
bases);
return NULL;
}
// Check dict['DESCRIPTOR']
PyObject* py_descriptor = PyDict_GetItemString(dict, "DESCRIPTOR");
if (py_descriptor == NULL) {
PyErr_SetString(PyExc_TypeError, "Message class has no DESCRIPTOR");
return NULL;
}
const upb_MessageDef* m = PyUpb_Descriptor_GetDef(py_descriptor);
PyObject* ret = PyUpb_ObjCache_Get(upb_MessageDef_MiniTable(m));
if (ret) return ret;
return PyUpb_MessageMeta_DoCreateClass(py_descriptor, name, dict);
}
static void PyUpb_MessageMeta_Dealloc(PyObject* self) {
PyUpb_MessageMeta* meta = PyUpb_GetMessageMeta(self);
PyUpb_ObjCache_Delete(meta->layout);
// The MessageMeta type is a GC type, which means we should untrack the
// object before invalidating internal state (so that code executed by the
// GC doesn't see the invalid state). Unfortunately since we're calling
// cpython_bits.type_dealloc, which also untracks the object, we can't.
// Instead just make sure the internal state remains reasonable by using
// Py_CLEAR(), which sets the struct member to NULL. The tp_traverse and
// tp_clear methods, which are called by Python's GC, already allow for it
// to be NULL.
Py_CLEAR(meta->py_message_descriptor);
PyTypeObject* tp = Py_TYPE(self);
cpython_bits.type_dealloc(self);
Py_DECREF(tp);
}
void PyUpb_MessageMeta_AddFieldNumber(PyObject* self, const upb_FieldDef* f) {
PyObject* name =
PyUnicode_FromFormat("%s_FIELD_NUMBER", upb_FieldDef_Name(f));
PyObject* upper = PyObject_CallMethod(name, "upper", "");
PyObject_SetAttr(self, upper, PyLong_FromLong(upb_FieldDef_Number(f)));
Py_DECREF(name);
Py_DECREF(upper);
}
static PyObject* PyUpb_MessageMeta_GetDynamicAttr(PyObject* self,
PyObject* name) {
const char* name_buf = PyUpb_GetStrData(name);
if (!name_buf) return NULL;
const upb_MessageDef* msgdef = PyUpb_MessageMeta_GetMsgdef(self);
const upb_FileDef* filedef = upb_MessageDef_File(msgdef);
const upb_DefPool* symtab = upb_FileDef_Pool(filedef);
PyObject* py_key =
PyBytes_FromFormat("%s.%s", upb_MessageDef_FullName(msgdef), name_buf);
const char* key = PyUpb_GetStrData(py_key);
PyObject* ret = NULL;
const upb_MessageDef* nested = upb_DefPool_FindMessageByName(symtab, key);
const upb_EnumDef* enumdef;
const upb_EnumValueDef* enumval;
const upb_FieldDef* ext;
if (nested) {
ret = PyUpb_Descriptor_GetClass(nested);
} else if ((enumdef = upb_DefPool_FindEnumByName(symtab, key))) {
PyUpb_ModuleState* state = PyUpb_ModuleState_Get();
PyObject* klass = state->enum_type_wrapper_class;
ret = PyUpb_EnumDescriptor_Get(enumdef);
ret = PyObject_CallFunctionObjArgs(klass, ret, NULL);
} else if ((enumval = upb_DefPool_FindEnumByNameval(symtab, key))) {
ret = PyLong_FromLong(upb_EnumValueDef_Number(enumval));
} else if ((ext = upb_DefPool_FindExtensionByName(symtab, key))) {
ret = PyUpb_FieldDescriptor_Get(ext);
}
Py_DECREF(py_key);
const char* suffix = "_FIELD_NUMBER";
size_t n = strlen(name_buf);
size_t suffix_n = strlen(suffix);
if (n > suffix_n && memcmp(suffix, name_buf + n - suffix_n, suffix_n) == 0) {
// We can't look up field names dynamically, because the <NAME>_FIELD_NUMBER
// naming scheme upper-cases the field name and is therefore non-reversible.
// So we just add all field numbers.
int n = upb_MessageDef_FieldCount(msgdef);
for (int i = 0; i < n; i++) {
PyUpb_MessageMeta_AddFieldNumber(self, upb_MessageDef_Field(msgdef, i));
}
n = upb_MessageDef_NestedExtensionCount(msgdef);
for (int i = 0; i < n; i++) {
PyUpb_MessageMeta_AddFieldNumber(
self, upb_MessageDef_NestedExtension(msgdef, i));
}
ret = PyObject_GenericGetAttr(self, name);
}
return ret;
}
static PyObject* PyUpb_MessageMeta_GetAttr(PyObject* self, PyObject* name) {
// We want to first delegate to the type's tp_dict to retrieve any attributes
// that were previously calculated and cached in the type's dict.
PyObject* ret = cpython_bits.type_getattro(self, name);
if (ret) return ret;
// We did not find a cached attribute. Try to calculate the attribute
// dynamically, using the descriptor as an argument.
PyErr_Clear();
ret = PyUpb_MessageMeta_GetDynamicAttr(self, name);
if (ret) {
PyObject_SetAttr(self, name, ret);
PyErr_Clear();
return ret;
}
PyErr_SetObject(PyExc_AttributeError, name);
return NULL;
}
static int PyUpb_MessageMeta_Traverse(PyObject* self, visitproc visit,
void* arg) {
PyUpb_MessageMeta* meta = PyUpb_GetMessageMeta(self);
Py_VISIT(meta->py_message_descriptor);
return cpython_bits.type_traverse(self, visit, arg);
}
static int PyUpb_MessageMeta_Clear(PyObject* self, visitproc visit, void* arg) {
PyUpb_MessageMeta* meta = PyUpb_GetMessageMeta(self);
Py_CLEAR(meta->py_message_descriptor);
return cpython_bits.type_clear(self);
}
static PyType_Slot PyUpb_MessageMeta_Slots[] = {
{Py_tp_new, PyUpb_MessageMeta_New},
{Py_tp_dealloc, PyUpb_MessageMeta_Dealloc},
{Py_tp_getattro, PyUpb_MessageMeta_GetAttr},
{Py_tp_traverse, PyUpb_MessageMeta_Traverse},
{Py_tp_clear, PyUpb_MessageMeta_Clear},
{0, NULL}};
static PyType_Spec PyUpb_MessageMeta_Spec = {
PYUPB_MODULE_NAME ".MessageMeta", // tp_name
0, // To be filled in by size of base // tp_basicsize
0, // tp_itemsize
// TODO: remove BASETYPE, Python should just use MessageMeta
// directly instead of subclassing it.
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE | Py_TPFLAGS_HAVE_GC, // tp_flags
PyUpb_MessageMeta_Slots,
};
static PyObject* PyUpb_MessageMeta_CreateType(void) {
PyObject* bases = Py_BuildValue("(O)", &PyType_Type);
if (!bases) return NULL;
PyUpb_MessageMeta_Spec.basicsize =
cpython_bits.type_basicsize + sizeof(PyUpb_MessageMeta);
PyObject* type = PyType_FromSpecWithBases(&PyUpb_MessageMeta_Spec, bases);
Py_DECREF(bases);
return type;
}
bool PyUpb_InitMessage(PyObject* m) {
if (!PyUpb_CPythonBits_Init(&cpython_bits)) return false;
PyObject* message_meta_type = PyUpb_MessageMeta_CreateType();
PyUpb_ModuleState* state = PyUpb_ModuleState_GetFromModule(m);
state->cmessage_type = PyUpb_AddClass(m, &PyUpb_Message_Spec);
state->message_meta_type = (PyTypeObject*)message_meta_type;
if (!state->cmessage_type || !state->message_meta_type) return false;
if (PyModule_AddObject(m, "MessageMeta", message_meta_type)) return false;
state->listfields_item_key = PyObject_GetAttrString(
(PyObject*)state->cmessage_type, "_ListFieldsItemKey");
PyObject* mod =
PyImport_ImportModule(PYUPB_PROTOBUF_PUBLIC_PACKAGE ".message");
if (mod == NULL) return false;
state->encode_error_class = PyObject_GetAttrString(mod, "EncodeError");
state->decode_error_class = PyObject_GetAttrString(mod, "DecodeError");
state->message_class = PyObject_GetAttrString(mod, "Message");
Py_DECREF(mod);
PyObject* enum_type_wrapper = PyImport_ImportModule(
PYUPB_PROTOBUF_INTERNAL_PACKAGE ".enum_type_wrapper");
if (enum_type_wrapper == NULL) return false;
state->enum_type_wrapper_class =
PyObject_GetAttrString(enum_type_wrapper, "EnumTypeWrapper");
Py_DECREF(enum_type_wrapper);
if (!state->encode_error_class || !state->decode_error_class ||
!state->message_class || !state->listfields_item_key ||
!state->enum_type_wrapper_class) {
return false;
}
return true;
}