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message.c
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message.c
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// 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 PyObject* PyUpb_Message_Clear(PyUpb_Message* self);
static bool PyUpb_Message_InitMessageAttribute(PyObject* _self, PyObject* name,
const upb_FieldDef* field,
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());
const upb_MessageDef* msgdef = upb_FieldDef_MessageSubDef(field);
if (upb_MessageDef_WellKnownType(msgdef) == kUpb_WellKnown_Struct) {
ok = PyObject_CallMethod(submsg, "_internal_assign", "O", value);
if (!ok && PyDict_Size(value) == 1 &&
PyDict_Contains(value, PyUnicode_FromString("fields"))) {
// Fall back to init as normal message field.
PyErr_Clear();
PyObject* tmp = PyUpb_Message_Clear((PyUpb_Message*)submsg);
Py_DECREF(tmp);
ok = PyUpb_Message_InitAttributes(submsg, NULL, value) >= 0;
}
} else {
ok = PyUpb_Message_InitAttributes(submsg, NULL, value) >= 0;
}
} else {
const upb_MessageDef* msgdef = upb_FieldDef_MessageSubDef(field);
if (upb_MessageDef_WellKnownType(msgdef) != kUpb_WellKnown_Unspecified &&
PyObject_HasAttrString(submsg, "_internal_assign")) {
ok = PyObject_CallMethod(submsg, "_internal_assign", "O", value);
} 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, f, 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;
}
const upb_MessageDef* msgdef = _PyUpb_Message_GetMsgdef(self);
upb_WellKnown wkt = upb_MessageDef_WellKnownType(msgdef);
if ((wkt == kUpb_WellKnown_ListValue && PyList_Check(other)) ||
(wkt == kUpb_WellKnown_Struct && PyDict_Check(other))) {
return PyObject_CallMethod(_self, "_internal_compare", "O", other);
}
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_IsRepeated(field)) {
PyErr_Format(exc,
"Assignment not allowed to map, or repeated "
"field \"%s\" in protocol message object.",
upb_FieldDef_Name(field));
return -1;
}
PyUpb_Message_EnsureReified(self);
if (upb_FieldDef_IsSubMessage(field)) {
const upb_MessageDef* msgdef = upb_FieldDef_MessageSubDef(field);
if (upb_MessageDef_WellKnownType(msgdef) != kUpb_WellKnown_Unspecified) {
PyObject* sub_message = PyUpb_Message_GetFieldValue(_self, field);
if (PyObject_HasAttrString(sub_message, "_internal_assign")) {
PyObject* ok =
PyObject_CallMethod(sub_message, "_internal_assign", "O", value);
if (!ok) return -1;
Py_DECREF(ok);
return 0;
}
}
PyErr_Format(exc,
"Assignment not allowed to message "
"field \"%s\" in protocol message object.",
upb_FieldDef_Name(field));
return -1;
}
upb_MessageValue val;
upb_Arena* arena = PyUpb_Arena_Get(self->arena);
if (!PyUpb_PyToUpb(value, field, &val, arena)) {
return -1;