knx/examples/knxPython/pybind11/tests/test_exceptions.cpp
Thomas Kunze 1c6d772056 astyle
2024-09-14 11:56:47 +02:00

563 lines
15 KiB
C++

/*
tests/test_custom-exceptions.cpp -- exception translation
Copyright (c) 2016 Pim Schellart <P.Schellart@princeton.edu>
All rights reserved. Use of this source code is governed by a
BSD-style license that can be found in the LICENSE file.
*/
#include <pybind11/gil_safe_call_once.h>
#include "test_exceptions.h"
#include "local_bindings.h"
#include "pybind11_tests.h"
#include <exception>
#include <stdexcept>
#include <utility>
// A type that should be raised as an exception in Python
class MyException : public std::exception
{
public:
explicit MyException(const char* m) : message{m} {}
const char* what() const noexcept override
{
return message.c_str();
}
private:
std::string message = "";
};
class MyExceptionUseDeprecatedOperatorCall : public MyException
{
using MyException::MyException;
};
// A type that should be translated to a standard Python exception
class MyException2 : public std::exception
{
public:
explicit MyException2(const char* m) : message{m} {}
const char* what() const noexcept override
{
return message.c_str();
}
private:
std::string message = "";
};
// A type that is not derived from std::exception (and is thus unknown)
class MyException3
{
public:
explicit MyException3(const char* m) : message{m} {}
virtual const char* what() const noexcept
{
return message.c_str();
}
// Rule of 5 BEGIN: to preempt compiler warnings.
MyException3(const MyException3&) = default;
MyException3(MyException3&&) = default;
MyException3& operator=(const MyException3&) = default;
MyException3& operator=(MyException3&&) = default;
virtual ~MyException3() = default;
// Rule of 5 END.
private:
std::string message = "";
};
// A type that should be translated to MyException
// and delegated to its exception translator
class MyException4 : public std::exception
{
public:
explicit MyException4(const char* m) : message{m} {}
const char* what() const noexcept override
{
return message.c_str();
}
private:
std::string message = "";
};
// Like the above, but declared via the helper function
class MyException5 : public std::logic_error
{
public:
explicit MyException5(const std::string& what) : std::logic_error(what) {}
};
// Inherits from MyException5
class MyException5_1 : public MyException5
{
using MyException5::MyException5;
};
// Exception that will be caught via the module local translator.
class MyException6 : public std::exception
{
public:
explicit MyException6(const char* m) : message{m} {}
const char* what() const noexcept override
{
return message.c_str();
}
private:
std::string message = "";
};
struct PythonCallInDestructor
{
explicit PythonCallInDestructor(const py::dict& d) : d(d) {}
~PythonCallInDestructor()
{
d["good"] = true;
}
py::dict d;
};
struct PythonAlreadySetInDestructor
{
explicit PythonAlreadySetInDestructor(const py::str& s) : s(s) {}
~PythonAlreadySetInDestructor()
{
py::dict foo;
try
{
// Assign to a py::object to force read access of nonexistent dict entry
py::object o = foo["bar"];
}
catch (py::error_already_set& ex)
{
ex.discard_as_unraisable(s);
}
}
py::str s;
};
TEST_SUBMODULE(exceptions, m)
{
m.def("throw_std_exception",
[]()
{
throw std::runtime_error("This exception was intentionally thrown.");
});
// PLEASE KEEP IN SYNC with docs/advanced/exceptions.rst
PYBIND11_CONSTINIT static py::gil_safe_call_once_and_store<py::object> ex_storage;
ex_storage.call_once_and_store_result(
[&]()
{
return py::exception<MyException>(m, "MyException");
});
py::register_exception_translator([](std::exception_ptr p)
{
try
{
if (p)
{
std::rethrow_exception(p);
}
}
catch (const MyException& e)
{
// Set MyException as the active python error
py::set_error(ex_storage.get_stored(), e.what());
}
});
// Same as above, but using the deprecated `py::exception<>::operator()`
// We want to be sure it still works, until it's removed.
static const auto* const exd = new py::exception<MyExceptionUseDeprecatedOperatorCall>(
m, "MyExceptionUseDeprecatedOperatorCall");
py::register_exception_translator([](std::exception_ptr p)
{
try
{
if (p)
{
std::rethrow_exception(p);
}
}
catch (const MyExceptionUseDeprecatedOperatorCall& e)
{
#if defined(__INTEL_COMPILER) || defined(__NVCOMPILER)
// It is not worth the trouble dealing with warning suppressions for these compilers.
// Falling back to the recommended approach to keep the test code simple.
py::set_error(*exd, e.what());
#else
PYBIND11_WARNING_PUSH
PYBIND11_WARNING_DISABLE_CLANG("-Wdeprecated-declarations")
PYBIND11_WARNING_DISABLE_GCC("-Wdeprecated-declarations")
PYBIND11_WARNING_DISABLE_MSVC(4996)
(*exd)(e.what());
PYBIND11_WARNING_POP
#endif
}
});
// register new translator for MyException2
// no need to store anything here because this type will
// never by visible from Python
py::register_exception_translator([](std::exception_ptr p)
{
try
{
if (p)
{
std::rethrow_exception(p);
}
}
catch (const MyException2& e)
{
// Translate this exception to a standard RuntimeError
py::set_error(PyExc_RuntimeError, e.what());
}
});
// register new translator for MyException4
// which will catch it and delegate to the previously registered
// translator for MyException by throwing a new exception
py::register_exception_translator([](std::exception_ptr p)
{
try
{
if (p)
{
std::rethrow_exception(p);
}
}
catch (const MyException4& e)
{
throw MyException(e.what());
}
});
// A simple exception translation:
auto ex5 = py::register_exception<MyException5>(m, "MyException5");
// A slightly more complicated one that declares MyException5_1 as a subclass of MyException5
py::register_exception<MyException5_1>(m, "MyException5_1", ex5.ptr());
// py::register_local_exception<LocalSimpleException>(m, "LocalSimpleException")
py::register_local_exception_translator([](std::exception_ptr p)
{
try
{
if (p)
{
std::rethrow_exception(p);
}
}
catch (const MyException6& e)
{
py::set_error(PyExc_RuntimeError, e.what());
}
});
m.def("throws1",
[]()
{
throw MyException("this error should go to py::exception<MyException>");
});
m.def("throws1d", []()
{
throw MyExceptionUseDeprecatedOperatorCall(
"this error should go to py::exception<MyExceptionUseDeprecatedOperatorCall>");
});
m.def("throws2",
[]()
{
throw MyException2("this error should go to a standard Python exception");
});
m.def("throws3", []()
{
throw MyException3("this error cannot be translated");
});
m.def("throws4", []()
{
throw MyException4("this error is rethrown");
});
m.def("throws5",
[]()
{
throw MyException5("this is a helper-defined translated exception");
});
m.def("throws5_1", []()
{
throw MyException5_1("MyException5 subclass");
});
m.def("throws6", []()
{
throw MyException6("MyException6 only handled in this module");
});
m.def("throws_logic_error", []()
{
throw std::logic_error("this error should fall through to the standard handler");
});
m.def("throws_overflow_error", []()
{
throw std::overflow_error("");
});
m.def("throws_local_error", []()
{
throw LocalException("never caught");
});
m.def("throws_local_simple_error", []()
{
throw LocalSimpleException("this mod");
});
m.def("exception_matches", []()
{
py::dict foo;
try
{
// Assign to a py::object to force read access of nonexistent dict entry
py::object o = foo["bar"];
}
catch (py::error_already_set& ex)
{
if (!ex.matches(PyExc_KeyError))
{
throw;
}
return true;
}
return false;
});
m.def("exception_matches_base", []()
{
py::dict foo;
try
{
// Assign to a py::object to force read access of nonexistent dict entry
py::object o = foo["bar"];
}
catch (py::error_already_set& ex)
{
if (!ex.matches(PyExc_Exception))
{
throw;
}
return true;
}
return false;
});
m.def("modulenotfound_exception_matches_base", []()
{
try
{
// On Python >= 3.6, this raises a ModuleNotFoundError, a subclass of ImportError
py::module_::import("nonexistent");
}
catch (py::error_already_set& ex)
{
if (!ex.matches(PyExc_ImportError))
{
throw;
}
return true;
}
return false;
});
m.def("throw_already_set", [](bool err)
{
if (err)
{
py::set_error(PyExc_ValueError, "foo");
}
try
{
throw py::error_already_set();
}
catch (const std::runtime_error& e)
{
if ((err && e.what() != std::string("ValueError: foo"))
|| (!err
&& e.what()
!= std::string("Internal error: pybind11::error_already_set called "
"while Python error indicator not set.")))
{
PyErr_Clear();
throw std::runtime_error("error message mismatch");
}
}
PyErr_Clear();
if (err)
{
py::set_error(PyExc_ValueError, "foo");
}
throw py::error_already_set();
});
m.def("python_call_in_destructor", [](const py::dict & d)
{
bool retval = false;
try
{
PythonCallInDestructor set_dict_in_destructor(d);
py::set_error(PyExc_ValueError, "foo");
throw py::error_already_set();
}
catch (const py::error_already_set&)
{
retval = true;
}
return retval;
});
m.def("python_alreadyset_in_destructor", [](const py::str & s)
{
PythonAlreadySetInDestructor alreadyset_in_destructor(s);
return true;
});
// test_nested_throws
m.def("try_catch",
[m](const py::object & exc_type, const py::function & f, const py::args & args)
{
try
{
f(*args);
}
catch (py::error_already_set& ex)
{
if (ex.matches(exc_type))
{
py::print(ex.what());
}
else
{
// Simply `throw;` also works and is better, but using `throw ex;`
// here to cover that situation (as observed in the wild).
throw ex; // Invokes the copy ctor.
}
}
});
// Test repr that cannot be displayed
m.def("simple_bool_passthrough", [](bool x)
{
return x;
});
m.def("throw_should_be_translated_to_key_error", []()
{
throw shared_exception();
});
m.def("raise_from", []()
{
py::set_error(PyExc_ValueError, "inner");
py::raise_from(PyExc_ValueError, "outer");
throw py::error_already_set();
});
m.def("raise_from_already_set", []()
{
try
{
py::set_error(PyExc_ValueError, "inner");
throw py::error_already_set();
}
catch (py::error_already_set& e)
{
py::raise_from(e, PyExc_ValueError, "outer");
throw py::error_already_set();
}
});
m.def("throw_nested_exception", []()
{
try
{
throw std::runtime_error("Inner Exception");
}
catch (const std::runtime_error&)
{
std::throw_with_nested(std::runtime_error("Outer Exception"));
}
});
m.def("error_already_set_what", [](const py::object & exc_type, const py::object & exc_value)
{
py::set_error(exc_type, exc_value);
std::string what = py::error_already_set().what();
bool py_err_set_after_what = (PyErr_Occurred() != nullptr);
PyErr_Clear();
return py::make_tuple(std::move(what), py_err_set_after_what);
});
m.def("test_cross_module_interleaved_error_already_set", []()
{
auto cm = py::module_::import("cross_module_interleaved_error_already_set");
auto interleaved_error_already_set
= reinterpret_cast<void (*)()>(PyLong_AsVoidPtr(cm.attr("funcaddr").ptr()));
interleaved_error_already_set();
});
m.def("test_error_already_set_double_restore", [](bool dry_run)
{
py::set_error(PyExc_ValueError, "Random error.");
py::error_already_set e;
e.restore();
PyErr_Clear();
if (!dry_run)
{
e.restore();
}
});
// https://github.com/pybind/pybind11/issues/4075
m.def("test_pypy_oserror_normalization", []()
{
try
{
py::module_::import("io").attr("open")("this_filename_must_not_exist", "r");
}
catch (const py::error_already_set& e)
{
return py::str(e.what()); // str must be built before e goes out of scope.
}
return py::str("UNEXPECTED");
});
m.def("test_fn_cast_int", [](const py::function & fn)
{
// function returns None instead of int, should give a useful error message
fn().cast<int>();
});
// m.def("pass_exception_void", [](const py::exception<void>&) {}); // Does not compile.
m.def("return_exception_void", []()
{
return py::exception<void>();
});
}