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#include "py_struct.h"
#include "py_cast.h"
#include "py_errors.h"
#include "py_gil.h"
#include "py_utils.h"
#include <yql/essentials/public/udf/udf_value.h>
#include <yql/essentials/public/udf/udf_value_builder.h>
#include <yql/essentials/public/udf/udf_type_inspection.h>
#include <yql/essentials/public/udf/udf_terminator.h>
#include <util/string/cast.h>
#include <util/string/join.h>
#include <util/string/builder.h>
using namespace NKikimr;
namespace NPython {
namespace {
TPyObjectPtr CreateNewStrucInstance(const TPyCastContext::TPtr& ctx, const NKikimr::NUdf::TType* type, const NUdf::TStructTypeInspector& inspector)
{
const auto it = ctx->StructTypes.emplace(type, TPyObjectPtr());
if (it.second) {
#if PY_MAJOR_VERSION >= 3
std::vector<PyStructSequence_Field> fields(inspector.GetMembersCount() + 1U);
for (ui32 i = 0U; i < inspector.GetMembersCount(); ++i) {
fields[i] = {const_cast<char*>(inspector.GetMemberName(i).Data()), nullptr};
}
fields.back() = {nullptr, nullptr};
PyStructSequence_Desc desc = {
INIT_MEMBER(name, "yql.Struct"),
INIT_MEMBER(doc, nullptr),
INIT_MEMBER(fields, fields.data()),
INIT_MEMBER(n_in_sequence, int(inspector.GetMembersCount()))
};
const auto typeObject = new PyTypeObject();
if (0 > PyStructSequence_InitType2(typeObject, &desc)) {
throw yexception() << "can't create struct type: " << GetLastErrorAsString();
}
it.first->second.ResetSteal(reinterpret_cast<PyObject*>(typeObject));
}
const TPyObjectPtr object = PyStructSequence_New(it.first->second.GetAs<PyTypeObject>());
#else
const auto className = TString("yql.Struct_") += ToString(ctx->StructTypes.size());
PyObject* metaclass = (PyObject *) &PyClass_Type;
const TPyObjectPtr name = PyRepr(TStringBuf(className));
const TPyObjectPtr bases = PyTuple_New(0);
const TPyObjectPtr dict = PyDict_New();
TPyObjectPtr newClass = PyObject_CallFunctionObjArgs(
metaclass, name.Get(), bases.Get(), dict.Get(),
nullptr);
if (!newClass) {
throw yexception() << "can't create new type: " << GetLastErrorAsString();
}
it.first->second = std::move(newClass);
}
Y_UNUSED(inspector);
const TPyObjectPtr object = PyInstance_New(it.first->second.Get(), nullptr, nullptr);
#endif
if (!object) {
throw yexception() << "can't struct instance: " << GetLastErrorAsString();
}
return object;
}
TPyObjectPtr ConvertStringToPyObject(TStringBuf str)
{
#if PY_MAJOR_VERSION >= 3
return PyUnicode_FromStringAndSize(str.data(), str.size());
#else
return PyString_FromStringAndSize(str.data(), str.size());
#endif
}
// Sized counterpart of PyDict_GetItemString from C API. Returns borrowed reference.
PyObject* GetItemFromPyDictUsingString(PyObject* v, TStringBuf key)
{
TPyObjectPtr kv = ConvertStringToPyObject(key);
if (!kv) {
PyErr_Clear();
return nullptr;
}
return PyDict_GetItem(v, kv.Get());
}
PyObject* GetItemFromPyDictUsingBytes(PyObject* v, TStringBuf key)
{
TPyObjectPtr bytesMemberName = PyBytes_FromStringAndSize(key.data(), key.size());
return PyDict_GetItem(v, bytesMemberName.Get());
}
// Helper function for double-probing UTF-8 str() and bytes() in the case of Python 3.
PyObject* GetItemFromPyDict(PyObject* v, TStringBuf key)
{
PyObject* ret = GetItemFromPyDictUsingString(v, key);
#if PY_MAJOR_VERSION >= 3
if (!ret) {
ret = GetItemFromPyDictUsingBytes(v, key);
}
#endif
return ret;
}
// Sized counterpart of PyObject_GetAttrString from C API. Returns strong reference.
TPyObjectPtr GetAttrFromPyObject(PyObject* v, TStringBuf name)
{
TPyObjectPtr w = ConvertStringToPyObject(name);
if (!w) {
return nullptr;
}
return PyObject_GetAttr(v, w.Get());
}
}
TPyObjectPtr ToPyStruct(const TPyCastContext::TPtr& ctx, const NUdf::TType* type, const NUdf::TUnboxedValuePod& value)
{
const NUdf::TStructTypeInspector inspector(*ctx->PyCtx->TypeInfoHelper, type);
const TPyObjectPtr object = CreateNewStrucInstance(ctx, type, inspector);
const auto membersCount = inspector.GetMembersCount();
if (auto ptr = value.GetElements()) {
for (Py_ssize_t i = 0; i < membersCount; ++i) {
#if PY_MAJOR_VERSION >= 3
auto item = ToPyObject(ctx, inspector.GetMemberType(i), *ptr++);
PyStructSequence_SetItem(object.Get(), i, item.Release());
#else
const TStringBuf name = inspector.GetMemberName(i);
const auto item = ToPyObject(ctx, inspector.GetMemberType(i), *ptr++);
if (0 > PyObject_SetAttrString(object.Get(), name.data(), item.Get())) {
throw yexception()
<< "Can't set attr '" << name << "' to python object: "
<< GetLastErrorAsString();
}
#endif
}
} else {
for (Py_ssize_t i = 0; i < membersCount; ++i) {
#if PY_MAJOR_VERSION >= 3
auto item = ToPyObject(ctx, inspector.GetMemberType(i), value.GetElement(i));
PyStructSequence_SetItem(object.Get(), i, item.Release());
#else
const TStringBuf name = inspector.GetMemberName(i);
const auto item = ToPyObject(ctx, inspector.GetMemberType(i), value.GetElement(i));
if (0 > PyObject_SetAttrString(object.Get(), name.data(), item.Get())) {
throw yexception()
<< "Can't set attr '" << name << "' to python object: "
<< GetLastErrorAsString();
}
#endif
}
}
return object;
}
NUdf::TUnboxedValue FromPyStruct(const TPyCastContext::TPtr& ctx, const NUdf::TType* type, PyObject* value)
{
NUdf::TUnboxedValue* items = nullptr;
const NUdf::TStructTypeInspector inspector(*ctx->PyCtx->TypeInfoHelper, type);
const auto membersCount = inspector.GetMembersCount();
auto mkqlStruct = ctx->ValueBuilder->NewArray(membersCount, items);
TVector<TString> errors;
if (PyDict_Check(value)) {
for (ui32 i = 0; i < membersCount; i++) {
TStringBuf memberName = inspector.GetMemberName(i);
auto memberType = inspector.GetMemberType(i);
// borrowed reference - no need to manage ownership
PyObject* item = GetItemFromPyDict(value, memberName);
if (!item) {
if (ctx->PyCtx->TypeInfoHelper->GetTypeKind(memberType) == NUdf::ETypeKind::Optional) {
items[i] = NUdf::TUnboxedValue();
continue;
}
errors.push_back(TStringBuilder() << "Dict has no item '" << memberName << "'");
continue;
}
try {
items[i] = FromPyObject(ctx, memberType, item);
} catch (const yexception& e) {
errors.push_back(TStringBuilder() << "Failed to convert dict item '" << memberName << "' - " << e.what());
}
}
if (!errors.empty()) {
throw yexception() << "Failed to convert dict to struct\n" << JoinSeq("\n", errors) << "\nDict repr: " << PyObjectRepr(value);
}
} else {
for (ui32 i = 0; i < membersCount; i++) {
TStringBuf memberName = inspector.GetMemberName(i);
auto memberType = inspector.GetMemberType(i);
TPyObjectPtr attr = GetAttrFromPyObject(value, memberName);
if (!attr) {
if (ctx->PyCtx->TypeInfoHelper->GetTypeKind(memberType) == NUdf::ETypeKind::Optional &&
PyErr_ExceptionMatches(PyExc_AttributeError)) {
PyErr_Clear();
items[i] = NUdf::TUnboxedValue();
continue;
}
errors.push_back(TStringBuilder() << "Object has no attr '" << memberName << "' , error: " << GetLastErrorAsString());
continue;
}
try {
items[i] = FromPyObject(ctx, memberType, attr.Get());
} catch (const yexception& e) {
errors.push_back(TStringBuilder() << "Failed to convert object attr '" << memberName << "' - " << e.what());
}
}
if (!errors.empty()) {
throw yexception() << "Failed to convert object to struct\n" << JoinSeq("\n", errors) << "\nObject repr: " << PyObjectRepr(value);
}
}
return mkqlStruct;
}
}
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