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Copy pathpy_error_status.cc
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167 lines (142 loc) · 5.03 KB
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/*
* Copyright 2025 Google LLC
*
* 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