| // Licensed to the Apache Software Foundation (ASF) under one |
| // or more contributor license agreements. See the NOTICE file |
| // distributed with this work for additional information |
| // regarding copyright ownership. The ASF licenses this file |
| // to you 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. |
| |
| #ifndef MESOS_NATIVE_COMMON_HPP |
| #define MESOS_NATIVE_COMMON_HPP |
| |
| // Python.h must be included before standard headers. |
| // See: http://docs.python.org/2/c-api/intro.html#include-files |
| #include <Python.h> |
| |
| #include <iostream> |
| |
| #include <google/protobuf/io/zero_copy_stream_impl.h> |
| |
| |
| namespace mesos { namespace python { |
| |
| /** |
| * The Python module object for mesos_pb2 (which contains the protobuf |
| * classes generated for Python). |
| */ |
| extern PyObject* mesos_pb2; |
| |
| |
| /** |
| * RAII utility class for acquiring the Python global interpreter lock. |
| */ |
| class InterpreterLock { |
| PyGILState_STATE state; |
| |
| public: |
| InterpreterLock() { |
| state = PyGILState_Ensure(); |
| } |
| |
| ~InterpreterLock() { |
| PyGILState_Release(state); |
| } |
| }; |
| |
| |
| /** |
| * Convert a Python protocol buffer object into a C++ one by serializing |
| * it to a string and deserializing the result back in C++. Returns true |
| * on success, or prints an error and returns false on failure. |
| */ |
| template <typename T> |
| bool readPythonProtobuf(PyObject* obj, T* t) |
| { |
| if (obj == Py_None) { |
| std::cerr << "None object given where protobuf expected" << std::endl; |
| return false; |
| } |
| PyObject* res = PyObject_CallMethod(obj, |
| (char*) "SerializeToString", |
| (char*) nullptr); |
| if (res == nullptr) { |
| std::cerr << "Failed to call Python object's SerializeToString " |
| << "(perhaps it is not a protobuf?)" << std::endl; |
| PyErr_Print(); |
| return false; |
| } |
| char* chars; |
| Py_ssize_t len; |
| if (PyString_AsStringAndSize(res, &chars, &len) < 0) { |
| std::cerr << "SerializeToString did not return a string" << std::endl; |
| PyErr_Print(); |
| Py_DECREF(res); |
| return false; |
| } |
| google::protobuf::io::ArrayInputStream stream(chars, len); |
| bool success = t->ParseFromZeroCopyStream(&stream); |
| if (!success) { |
| std::cerr << "Could not deserialize protobuf as expected type" << std::endl; |
| } |
| Py_DECREF(res); |
| return success; |
| } |
| |
| |
| /** |
| * Convert a C++ protocol buffer object into a Python one by serializing |
| * it to a string and deserializing the result back in Python. Returns the |
| * resulting PyObject* on success or raises a Python exception and returns |
| * nullptr on failure. |
| */ |
| template <typename T> |
| PyObject* createPythonProtobuf(const T& t, const char* typeName) |
| { |
| PyObject* dict = PyModule_GetDict(mesos_pb2); |
| if (dict == nullptr) { |
| PyErr_Format(PyExc_Exception, "PyModule_GetDict failed"); |
| return nullptr; |
| } |
| |
| PyObject* type = PyDict_GetItemString(dict, typeName); |
| if (type == nullptr) { |
| PyErr_Format(PyExc_Exception, "Could not resolve mesos_pb2.%s", typeName); |
| return nullptr; |
| } |
| if (!PyType_Check(type)) { |
| PyErr_Format(PyExc_Exception, "mesos_pb2.%s is not a type", typeName); |
| return nullptr; |
| } |
| |
| std::string str; |
| if (!t.SerializeToString(&str)) { |
| PyErr_Format(PyExc_Exception, "C++ %s SerializeToString failed", typeName); |
| return nullptr; |
| } |
| |
| // Propagates any exception that might happen in FromString. |
| return PyObject_CallMethod(type, |
| (char*) "FromString", |
| (char*) "s#", |
| str.data(), |
| str.size()); |
| } |
| |
| } // namespace python { |
| } // namespace mesos { |
| |
| #endif /* MESOS_NATIVE_COMMON_HPP */ |