cel-python/cel_expr_python/py_error_status.cc at main · cel-expr/cel-python · GitHub

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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

* http://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_error_status.h"

#include <Python.h> // IWYU pragma: keep - Needed for PyObject

#include <stdexcept>

#include "absl/base/no_destructor.h"

#include "absl/container/flat_hash_map.h"

#include "absl/log/absl_check.h"

#include "absl/log/absl_log.h" // IWYU pragma: keep - Needed for ABSL_LOG

#include "absl/status/status.h"

#undef LOG_ALL_PY_ERRORS

namespace cel_python {

namespace py = pybind11;

static absl::Status PyErrorToStatus(PyObject* py_type, PyObject* py_error) {

// Loose mapping from Python exceptions to absl::Status codes, consistent with

// the pybind11 mapping.

static const absl::NoDestructor<

absl::flat_hash_map<PyObject*, absl::StatusCode>>

kPyExceptionToStatusMap(

{{PyExc_MemoryError, absl::StatusCode::kResourceExhausted},

{PyExc_NotImplementedError, absl::StatusCode::kUnimplemented},

{PyExc_KeyboardInterrupt, absl::StatusCode::kAborted},

{PyExc_SystemError, absl::StatusCode::kInternal},

{PyExc_SyntaxError, absl::StatusCode::kInternal},

{PyExc_TypeError, absl::StatusCode::kInvalidArgument},

{PyExc_ValueError, absl::StatusCode::kOutOfRange},

{PyExc_LookupError, absl::StatusCode::kNotFound},

{PyExc_OverflowError, absl::StatusCode::kOutOfRange}});

PyObject* pystr = PyObject_Str(py_error);

const char* message = pystr ? PyUnicode_AsUTF8(pystr) : "Unknown error";

Py_XDECREF(pystr);

auto it = kPyExceptionToStatusMap->find(py_type);

if (it == kPyExceptionToStatusMap->end()) {

return absl::UnknownError(message);

}

return absl::Status(it->second, message);

}

// A custom exception type that can be thrown from C++ to Python.

// This allows us to propagate absl::Status through pybind11 without introducing

// a dependency on pybind11_abseil:status_casters.

class PyCelError : public pybind11::builtin_exception {

public:

explicit PyCelError(const absl::Status& status)

: builtin_exception(status.ToString() + " [" +

absl::StatusCodeToString(status.code()) + "]") {

switch (status.code()) {

case absl::StatusCode::kInvalidArgument:

case absl::StatusCode::kOutOfRange:

py_err_type_ = PyExc_ValueError;

break;

case absl::StatusCode::kNotFound:

py_err_type_ = PyExc_LookupError;

break;

default:

py_err_type_ = PyExc_RuntimeError;

break;

}

void set_error() const override { PyErr_SetString(py_err_type_, what()); }

private:

PyObject* py_err_type_;

};

void ThrowIfError(const absl::Status& status) {

if (!status.ok()) {

throw PyCelError(status);

}

std::runtime_error StatusToException(const absl::Status& status) {

ABSL_CHECK(!status.ok()); // Crash OK: all call sites are

// local to the library.

return PyCelError(status);

}

static absl::Status& PendingPyError() {

static thread_local absl::NoDestructor<absl::Status> pending_py_error(

absl::OkStatus());

return *pending_py_error;

}

static absl::Status PyErr_toStatusInternal() {

PyObject* py_error = PyErr_Occurred();

if (!py_error) {

absl::Status status = PendingPyError();

if (!status.ok()) {

PendingPyError() = absl::OkStatus();

return status;

}

return absl::OkStatus();

}

absl::Status status;

PyObject *ptype, *pvalue, *ptraceback;

// Fetch the exception details

PyErr_Fetch(&ptype, &pvalue, &ptraceback);

PyErr_NormalizeException(&ptype, &pvalue, &ptraceback);

// Get the string representation of the error message

if (pvalue) {

status = PyErrorToStatus(ptype, pvalue);

}

// Clean up all the fetched objects

Py_XDECREF(ptype);

Py_XDECREF(pvalue);

Py_XDECREF(ptraceback);

PendingPyError() = absl::OkStatus();

return status;

}

absl::Status PyErr_toStatus() {

if (!PyGILState_Check()) {

py::gil_scoped_acquire acquire;

return PyErr_toStatusInternal();

}

return PyErr_toStatusInternal();

}

void PyErr_noteAndClear() {

if (!PyErr_Occurred()) {

return;

}

// Fetch the exception details

PyObject *ptype, *pvalue, *ptraceback;

PyErr_Fetch(&ptype, &pvalue, &ptraceback);

PyErr_NormalizeException(&ptype, &pvalue, &ptraceback);

PendingPyError() = PyErrorToStatus(ptype, pvalue);

PyErr_Clear();

// Clean up all the fetched objects

Py_XDECREF(ptype);

Py_XDECREF(pvalue);

Py_XDECREF(ptraceback);

#ifdef LOG_ALL_PY_ERRORS

ABSL_LOG(INFO) << "PyErr_Occurred: " << PendingPyError();

#endif

}

} // namespace cel_python

cel-python/cel_expr_python/py_error_status.cc at main · cel-expr/cel-python · GitHub

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