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222 lines (197 loc) · 6.86 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.
*/
#define PY_SSIZE_T_CLEAN
#include "cel_expr_python/py_descriptor_database.h"
#include <Python.h> // IWYU pragma: keep - Needed for PyObject
#include <cstdint>
#include "absl/log/absl_check.h"
#include "common/minimal_descriptor_pool.h"
#include "cel_expr_python/py_error_status.h"
#include "google/protobuf/descriptor.h"
#include <pybind11/pybind11.h>
namespace cel_python {
namespace py = pybind11;
PyDescriptorDatabase::PyDescriptorDatabase(PyObject* py_descriptor_pool)
: py_descriptor_pool_(py_descriptor_pool),
standard_pool_(cel::GetMinimalDescriptorPool()) {
ABSL_CHECK(PyGILState_Check());
Py_XINCREF(py_descriptor_pool_);
}
PyDescriptorDatabase::~PyDescriptorDatabase() {
if (py_descriptor_pool_ == nullptr) {
return;
}
if (!PyGILState_Check()) {
py::gil_scoped_acquire acquire;
Py_XDECREF(py_descriptor_pool_);
} else {
Py_XDECREF(py_descriptor_pool_);
}
}
// Find a file by file name. Fills in in *output and returns true if found.
// Otherwise, returns false, leaving the contents of *output undefined.
bool PyDescriptorDatabase::FindFileByName(StringViewArg filename,
google::protobuf::FileDescriptorProto* output) {
const google::protobuf::FileDescriptor* file = standard_pool_.FindFileByName(filename);
if (file != nullptr) {
file->CopyTo(output);
return true;
}
if (py_descriptor_pool_ == nullptr) {
return false;
}
py::gil_scoped_acquire acquire;
PyObject* pyfile = PyObject_CallMethod(
py_descriptor_pool_, "FindFileByName", "s#", filename.data(),
static_cast<Py_ssize_t>(filename.size()));
if (pyfile == nullptr) {
// Ignore KeyError raised by the method, if any
if (PyErr_Occurred() == PyExc_KeyError) {
PyErr_Clear();
} else {
PyErr_noteAndClear();
}
return false;
}
PyObject* pyfile_serialized = PyObject_GetAttrString(pyfile, "serialized_pb");
Py_DECREF(pyfile);
if (pyfile_serialized == nullptr) {
PyErr_Format(PyExc_TypeError,
"Python file has no attribute 'serialized_pb'");
PyErr_noteAndClear();
return false;
}
bool ok = output->ParseFromArray(
reinterpret_cast<uint8_t*>(PyBytes_AS_STRING(pyfile_serialized)),
PyBytes_GET_SIZE(pyfile_serialized));
if (!ok) {
PyErr_Format(PyExc_RuntimeError, "Failed to parse descriptor for %s",
filename.data());
PyErr_noteAndClear();
}
Py_DECREF(pyfile_serialized);
return ok;
}
// Find the file that declares the given fully-qualified symbol name.
// If found, fills in *output and returns true, otherwise returns false
// and leaves *output undefined.
bool PyDescriptorDatabase::FindFileContainingSymbol(
StringViewArg symbol_name, google::protobuf::FileDescriptorProto* output) {
const google::protobuf::FileDescriptor* file =
standard_pool_.FindFileContainingSymbol(symbol_name);
if (file != nullptr) {
file->CopyTo(output);
return true;
}
if (py_descriptor_pool_ == nullptr) {
return false;
}
py::gil_scoped_acquire acquire;
PyObject* pyfile = PyObject_CallMethod(
py_descriptor_pool_, "FindFileContainingSymbol", "s#", symbol_name.data(),
static_cast<Py_ssize_t>(symbol_name.size()));
if (pyfile == nullptr) {
// Ignore KeyError raised by the method, if any
if (PyErr_Occurred() == PyExc_KeyError) {
PyErr_Clear();
} else {
PyErr_noteAndClear();
}
return false;
}
PyObject* pyfile_serialized = PyObject_GetAttrString(pyfile, "serialized_pb");
Py_DECREF(pyfile);
if (pyfile_serialized == nullptr) {
PyErr_Format(PyExc_TypeError,
"Python file has no attribute 'serialized_pb'");
PyErr_noteAndClear();
return false;
}
bool ok = output->ParseFromArray(
reinterpret_cast<uint8_t*>(PyBytes_AS_STRING(pyfile_serialized)),
PyBytes_GET_SIZE(pyfile_serialized));
if (!ok) {
PyErr_Format(PyExc_RuntimeError, "Failed to parse descriptor for %s",
symbol_name.data());
PyErr_noteAndClear();
}
Py_DECREF(pyfile_serialized);
return ok;
}
// Find the file which defines an extension extending the given message type
// with the given field number. If found, fills in *output and returns true,
// otherwise returns false and leaves *output undefined. containing_type
// must be a fully-qualified type name.
bool PyDescriptorDatabase::FindFileContainingExtension(
StringViewArg containing_type, int field_number,
google::protobuf::FileDescriptorProto* output) {
if (py_descriptor_pool_ == nullptr) {
return false;
}
py::gil_scoped_acquire acquire;
PyObject* py_containing_type = PyObject_CallMethod(
py_descriptor_pool_, "FindMessageTypeByName", "s#",
containing_type.data(), static_cast<Py_ssize_t>(containing_type.size()));
if (py_containing_type == nullptr) {
// Ignore KeyError raised by the method, if any
if (PyErr_Occurred() == PyExc_KeyError) {
PyErr_Clear();
} else {
PyErr_noteAndClear();
}
return false;
}
PyObject* ext_desc =
PyObject_CallMethod(py_descriptor_pool_, "FindExtensionByNumber", "Oi",
py_containing_type, field_number);
if (ext_desc == nullptr) {
// Ignore KeyError raised by the method, if any
if (PyErr_Occurred() == PyExc_KeyError) {
PyErr_Clear();
} else {
PyErr_noteAndClear();
}
return false;
}
PyObject* pyfile = PyObject_GetAttrString(ext_desc, "file");
Py_DECREF(ext_desc);
if (pyfile == nullptr) {
PyErr_Format(PyExc_TypeError,
"Extension descriptor has no attribute 'file'");
PyErr_noteAndClear();
return false;
}
PyObject* pyfile_serialized = PyObject_GetAttrString(pyfile, "serialized_pb");
Py_DECREF(pyfile);
if (pyfile_serialized == nullptr) {
PyErr_Format(PyExc_TypeError,
"Python file has no attribute 'serialized_pb'");
PyErr_noteAndClear();
return false;
}
bool ok = output->ParseFromArray(
reinterpret_cast<uint8_t*>(PyBytes_AS_STRING(pyfile_serialized)),
PyBytes_GET_SIZE(pyfile_serialized));
if (!ok) {
PyErr_Format(PyExc_RuntimeError,
"Failed to parse descriptor for %s, extension %d",
containing_type.data(), field_number);
PyErr_noteAndClear();
}
Py_DECREF(pyfile_serialized);
return ok;
}
} // namespace cel_python