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Copy patherror.cpp
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94 lines (79 loc) · 2.38 KB
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/*
* Copyright (c) Meta Platforms, Inc. and affiliates.
*
* 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 <folly/python/error.h>
#include <stdexcept>
#include <string>
#include <folly/python/Weak.h>
#include <folly/Conv.h>
#include <folly/ScopeGuard.h>
namespace folly {
namespace python {
namespace {
// Best effort c-api implementation of repr(obj)
std::string pyObjectToString(PyObject* obj) {
constexpr StringPiece kConversionFail = "Error conversion failed";
PyObject* pyStr = nullptr;
PyObject* pyBytes = nullptr;
SCOPE_EXIT {
Py_DecRef(pyStr);
Py_DecRef(pyBytes);
// Swallow any errors that arise in this function
PyErr_Clear();
};
pyStr = PyObject_Repr(obj);
if (pyStr == nullptr) {
return std::string(kConversionFail);
}
char* cStr = nullptr;
pyBytes = PyUnicode_AsEncodedString(pyStr, "utf-8", "strict");
if (pyBytes == nullptr) {
return std::string(kConversionFail);
}
cStr = PyBytes_AsString(pyBytes);
if (cStr == nullptr) {
return std::string(kConversionFail);
}
return std::string(cStr);
}
} // namespace
void handlePythonError(StringPiece errPrefix) {
PyObject* ptype = nullptr;
PyObject* pvalue = nullptr;
PyObject* ptraceback = nullptr;
SCOPE_EXIT {
Py_DecRef(ptype);
Py_DecRef(pvalue);
Py_DecRef(ptraceback);
};
/**
* PyErr_Fetch will clear the error indicator (which *should* be set here, but
* let's not assume it is)
*/
PyErr_Fetch(&ptype, &pvalue, &ptraceback);
if (ptype == nullptr) {
throw std::runtime_error(
to<std::string>(errPrefix, "No error indicator set"));
}
if (pvalue == nullptr) {
throw std::runtime_error(
to<std::string>(
errPrefix, "Exception of type: ", pyObjectToString(ptype)));
}
throw std::runtime_error(
to<std::string>(errPrefix, pyObjectToString(pvalue)));
}
} // namespace python
} // namespace folly