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#include <library/cpp/resource/resource.h>
#include <util/generic/scope.h>
#include <util/generic/strbuf.h>
#include <Python.h>
#include <marshal.h>
#include <type_traits>
#include <concepts>
namespace {
namespace NWrap {
template<typename F>
requires std::convertible_to<std::invoke_result_t<F>, PyObject*>
PyObject* CallWithErrorTranslation(F&& f) noexcept {
try {
return std::forward<F>(f)();
} catch (const std::bad_alloc& err) {
PyErr_SetString(PyExc_MemoryError, err.what());
} catch(const std::out_of_range& err) {
PyErr_SetString(PyExc_IndexError, err.what());
} catch (const std::exception& err) {
PyErr_SetString(PyExc_RuntimeError, err.what());
} catch(...) {
PyErr_SetString(PyExc_RuntimeError, "Unhandled C++ exception of unknown type");
}
return nullptr;
}
PyObject* Count(PyObject* self[[maybe_unused]], PyObject *args[[maybe_unused]]) noexcept {
static_assert(
noexcept(NResource::Count()),
"Python3 Arcadia runtime binding assumes that NResource::Count do not throw exception. If this function start "
"to throw someone must add code translating C++ exceptions into Python exceptions here."
);
return PyLong_FromLong(NResource::Count());
}
PyObject* KeyByIndex(PyObject* self[[maybe_unused]], PyObject *const *args, Py_ssize_t nargs) noexcept {
if (nargs != 1) {
PyErr_Format(PyExc_TypeError, "__res.key_by_index takes 1 positional arguments but %z were given", nargs);
return nullptr;
}
if (PyFloat_Check(args[0])) {
PyErr_SetString(PyExc_TypeError, "integer argument expected, got float");
return nullptr;
}
PyObject* asNum = PyNumber_Index(args[0]);
if (!asNum) {
return nullptr;
}
const auto idx = PyLong_AsSize_t(asNum);
Py_DECREF(asNum);
if (idx == static_cast<size_t>(-1)) {
return nullptr;
}
return CallWithErrorTranslation([&]{
const auto res = NResource::KeyByIndex(idx);
return PyBytes_FromStringAndSize(res.data(), res.size());
});
}
PyObject* Find(PyObject* self[[maybe_unused]], PyObject *const* args, Py_ssize_t nargs) noexcept {
if (nargs != 1) {
PyErr_Format(PyExc_TypeError, "__res.find takes 1 positional arguments but %z were given", nargs);
return nullptr;
}
TStringBuf key;
if (PyUnicode_Check(args[0])) {
Py_ssize_t sz;
const char* data = PyUnicode_AsUTF8AndSize(args[0], &sz);
if (sz < 0) {
return nullptr;
}
key = {data, static_cast<size_t>(sz)};
} else {
char* data = nullptr;
Py_ssize_t sz;
if (PyBytes_AsStringAndSize(args[0], &data, &sz) != 0) {
return nullptr;
}
key = {data, static_cast<size_t>(sz)};
}
return CallWithErrorTranslation([&]{
TString res;
if (!NResource::FindExact(key, &res)) {
Py_RETURN_NONE;
}
return PyBytes_FromStringAndSize(res.data(), res.size());
});
}
PyObject* Has(PyObject* self[[maybe_unused]], PyObject *const* args, Py_ssize_t nargs) noexcept {
if (nargs != 1) {
PyErr_Format(PyExc_TypeError, "__res.has takes 1 positional arguments but %z were given", nargs);
return nullptr;
}
TStringBuf key;
if (PyUnicode_Check(args[0])) {
Py_ssize_t sz;
const char* data = PyUnicode_AsUTF8AndSize(args[0], &sz);
if (sz < 0) {
return nullptr;
}
key = {data, static_cast<size_t>(sz)};
} else {
char* data = nullptr;
Py_ssize_t sz;
if (PyBytes_AsStringAndSize(args[0], &data, &sz) != 0) {
return nullptr;
}
key = {data, static_cast<size_t>(sz)};
}
return CallWithErrorTranslation([&]{
int res = NResource::Has(key);
return PyBool_FromLong(res);
});
}
}
const unsigned char res_importer_pyc[] = {
#include "__res.pyc.inc"
};
int mod__res_exec(PyObject *mod) noexcept {
PyObject* modules = PySys_GetObject("modules");
Y_ASSERT(modules);
Y_ASSERT(PyMapping_Check(modules));
if (PyMapping_SetItemString(modules, "run_import_hook", mod) == -1) {
return -1;
}
PyObject *bytecode = PyMarshal_ReadObjectFromString(
reinterpret_cast<const char*>(res_importer_pyc),
std::size(res_importer_pyc)
);
if (bytecode == NULL) {
return -1;
}
// The code below which sets "__builtins__" is a workarownd for issue
// reported here https://github.com/python/cpython/issues/130272 .
// The problem can be seen for Y_PYTHON_SOURCE_ROOT mode when trying
// compiling the code wich contains non-ascii identifiers. In this case
// call to `compile` in get_code function raises the exception
// KeyError: '__builtins__' inside `PyImport_Import` function.
PyObject* builtinsKey = NULL;
Y_DEFER {
Py_DECREF(bytecode);
Py_DECREF(builtinsKey);
};
PyObject* modns = PyModule_GetDict(mod);
if (!modns) {
return -1;
}
builtinsKey = PyUnicode_FromString("__builtins__");
if (builtinsKey == NULL) {
return -1;
}
int r = PyDict_Contains(modns, builtinsKey);
if (r < 0) {
return -1;
} if (r == 0) {
PyObject* builtins = PyEval_GetBuiltins();
if (builtins == NULL) {
return -1;
}
if (PyDict_SetItem(modns, builtinsKey, builtins) < 0) {
return -1;
}
}
if (PyObject* evalRes = PyEval_EvalCode(bytecode, modns, modns)) {
Py_DECREF(evalRes);
}
if (PyErr_Occurred()) {
return -1;
}
return 0;
}
PyDoc_STRVAR(mod__res_doc,
"resfs python bindings module with importer hook supporting hermetic python programs.");
PyMethodDef mod__res_methods[] = {
{"count", _PyCFunction_CAST(NWrap::Count), METH_NOARGS, PyDoc_STR("Returns number of embedded resources.")},
{"key_by_index", _PyCFunction_CAST(NWrap::KeyByIndex), METH_FASTCALL, PyDoc_STR("Returns resource key by resource index.")},
{"find", _PyCFunction_CAST(NWrap::Find), METH_FASTCALL, PyDoc_STR("Finds resource content by key.")},
{"has", _PyCFunction_CAST(NWrap::Has), METH_FASTCALL, PyDoc_STR("Checks if the resource with the given key exists.")},
{nullptr, nullptr, 0, nullptr}
};
PyModuleDef_Slot mod__res_slots[] = {
{Py_mod_exec, reinterpret_cast<void*>(&mod__res_exec)},
{Py_mod_multiple_interpreters, Py_MOD_PER_INTERPRETER_GIL_SUPPORTED},
{0, nullptr},
};
PyModuleDef mod__res = {
.m_base = PyModuleDef_HEAD_INIT,
.m_name = "__res",
.m_doc = mod__res_doc,
.m_size = 0,
.m_methods = mod__res_methods,
.m_slots = mod__res_slots,
.m_traverse = nullptr,
.m_clear = nullptr,
.m_free = nullptr
};
}
PyMODINIT_FUNC
PyInit___res() noexcept {
return PyModuleDef_Init(&mod__res);
}
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