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// Licensed under the Apache License, Version 2.0 (the "License");

// you may not use this file except in compliance with the License.

// You may obtain a copy of the License at

// https://www.apache.org/licenses/LICENSE-2.0

// Unless required by applicable law or agreed to in writing, software

// distributed under the License is distributed on an "AS IS" BASIS,

// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

// See the License for the specific language governing permissions and

// limitations under the License.

#include "cel_expr_python/py_cel_function.h"

#include <Python.h>

#include <memory>

#include <string>

#include <utility>

#include <vector>

#include "absl/log/absl_check.h"

#include "absl/status/status.h"

#include "absl/status/statusor.h"

#include "absl/strings/str_format.h"

#include "absl/types/span.h"

#include "common/value.h"

#include "runtime/embedder_context.h"

#include "runtime/function.h"

#include "cel_expr_python/py_cel_arena.h"

#include "cel_expr_python/py_cel_env_internal.h"

#include "cel_expr_python/py_cel_type.h"

#include "cel_expr_python/py_cel_value.h"

#include "cel_expr_python/py_error_status.h"

#include "cel_expr_python/status_macros.h"

#include <pybind11/pybind11.h>

#include <pybind11/stl.h>

namespace cel_python {

namespace py = ::pybind11;

namespace {

static std::shared_ptr<PyCelEnvInternal> GetEnvFromContext(

const cel::Function::InvokeContext& context) {

ABSL_CHECK(context.embedder_context()); // Crash OK: all call sites are local

// to the library.

return *context.embedder_context()->Get<std::shared_ptr<PyCelEnvInternal>*>();

}

} // namespace

void PyCelFunction::DefinePythonBindings(pybind11::module& m) {

py::class_<PyCelFunction, std::shared_ptr<PyCelFunction>>(m, "Function")

.def(py::init<std::string, std::vector<PyCelType>, bool, py::object,

PyCelType>(),

py::arg("function_name"), py::arg("parameters"),

py::arg("is_member"), py::arg("impl"),

py::arg("return_type") = PyCelType::Dyn());

}

PyCelFunction::PyCelFunction(std::string function_name,

std::vector<PyCelType> parameters, bool is_member,

py::object impl, PyCelType return_type)

: function_name_(std::move(function_name)),

return_type_(std::move(return_type)),

parameters_(std::move(parameters)),

is_member_(is_member),

impl_(std::move(impl)) {

ABSL_CHECK(PyGILState_Check());

}

PyCelFunctionAdapter::PyCelFunctionAdapter(std::string function_name,

PyCelType return_type,

const py::object& py_function)

: function_name_(std::move(function_name)),

return_type_(std::move(return_type)),

py_function_(py_function.ptr()) {

if (!PyGILState_Check()) {

py::gil_scoped_acquire acquire;

Py_XINCREF(py_function_);

} else {

Py_XINCREF(py_function_);

}

PyCelFunctionAdapter::~PyCelFunctionAdapter() {

if (py_function_ != nullptr) {

if (!PyGILState_Check()) {

py::gil_scoped_acquire acquire;

Py_XDECREF(py_function_);

} else {

Py_XDECREF(py_function_);

}

absl::StatusOr<cel::Value> PyCelFunctionAdapter::Invoke(

absl::Span<const cel::Value> args,

const cel::Function::InvokeContext& context) const {

py::gil_scoped_acquire acquire;

std::shared_ptr<PyCelEnvInternal> env = GetEnvFromContext(context);

CEL_PYTHON_ASSIGN_OR_RETURN(auto py_arena,

PyCelArena::FromProtoArena(context.arena()));

PyObject* py_args = PyTuple_New(args.size());

for (int i = 0; i < args.size(); ++i) {

PyTuple_SetItem(py_args, i,

CelValueToPyObject(args[i], env, py_arena,

/*plain_value=*/true));

}

PyObject* result = PyObject_CallObject(py_function_, py_args);

Py_DECREF(py_args);

absl::Status status = PyErr_toStatus();

if (!status.ok()) {

Py_XDECREF(result);

return cel::ErrorValue::From(status, context.arena());

}

absl::StatusOr<cel::Value> cel_result = PyObjectToCelValue(

result, return_type_,

[this]() {

return absl::StrFormat("Python function '%s'",

PyUnicode_AsUTF8(PyObject_Repr(py_function_)));

env, context.arena());

Py_XDECREF(result);

return cel_result;

}

} // namespace cel_python