| // Protocol Buffers - Google's data interchange format |
| // Copyright 2008 Google Inc. All rights reserved. |
| // https://developers.google.com/protocol-buffers/ |
| // |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are |
| // met: |
| // |
| // * Redistributions of source code must retain the above copyright |
| // notice, this list of conditions and the following disclaimer. |
| // * Redistributions in binary form must reproduce the above |
| // copyright notice, this list of conditions and the following disclaimer |
| // in the documentation and/or other materials provided with the |
| // distribution. |
| // * Neither the name of Google Inc. nor the names of its |
| // contributors may be used to endorse or promote products derived from |
| // this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| // This file defines a C++ DescriptorDatabase, which wraps a Python Database |
| // and delegate all its operations to Python methods. |
| |
| #include <google/protobuf/pyext/descriptor_database.h> |
| |
| #include <google/protobuf/stubs/logging.h> |
| #include <google/protobuf/stubs/common.h> |
| #include <google/protobuf/descriptor.pb.h> |
| #include <google/protobuf/pyext/message.h> |
| #include <google/protobuf/pyext/scoped_pyobject_ptr.h> |
| |
| namespace google { |
| namespace protobuf { |
| namespace python { |
| |
| PyDescriptorDatabase::PyDescriptorDatabase(PyObject* py_database) |
| : py_database_(py_database) { |
| Py_INCREF(py_database_); |
| } |
| |
| PyDescriptorDatabase::~PyDescriptorDatabase() { Py_DECREF(py_database_); } |
| |
| // Convert a Python object to a FileDescriptorProto pointer. |
| // Handles all kinds of Python errors, which are simply logged. |
| static bool GetFileDescriptorProto(PyObject* py_descriptor, |
| FileDescriptorProto* output) { |
| if (py_descriptor == NULL) { |
| if (PyErr_ExceptionMatches(PyExc_KeyError)) { |
| // Expected error: item was simply not found. |
| PyErr_Clear(); |
| } else { |
| GOOGLE_LOG(ERROR) << "DescriptorDatabase method raised an error"; |
| PyErr_Print(); |
| } |
| return false; |
| } |
| const Descriptor* filedescriptor_descriptor = |
| FileDescriptorProto::default_instance().GetDescriptor(); |
| CMessage* message = reinterpret_cast<CMessage*>(py_descriptor); |
| if (PyObject_TypeCheck(py_descriptor, &CMessage_Type) && |
| message->message->GetDescriptor() == filedescriptor_descriptor) { |
| // Fast path: Just use the pointer. |
| FileDescriptorProto* file_proto = |
| static_cast<FileDescriptorProto*>(message->message); |
| *output = *file_proto; |
| return true; |
| } else { |
| // Slow path: serialize the message. This allows to use databases which |
| // use a different implementation of FileDescriptorProto. |
| ScopedPyObjectPtr serialized_pb( |
| PyObject_CallMethod(py_descriptor, "SerializeToString", NULL)); |
| if (serialized_pb == NULL) { |
| GOOGLE_LOG(ERROR) |
| << "DescriptorDatabase method did not return a FileDescriptorProto"; |
| PyErr_Print(); |
| return false; |
| } |
| char* str; |
| Py_ssize_t len; |
| if (PyBytes_AsStringAndSize(serialized_pb.get(), &str, &len) < 0) { |
| GOOGLE_LOG(ERROR) |
| << "DescriptorDatabase method did not return a FileDescriptorProto"; |
| PyErr_Print(); |
| return false; |
| } |
| FileDescriptorProto file_proto; |
| if (!file_proto.ParseFromArray(str, len)) { |
| GOOGLE_LOG(ERROR) |
| << "DescriptorDatabase method did not return a FileDescriptorProto"; |
| return false; |
| } |
| *output = file_proto; |
| return true; |
| } |
| } |
| |
| // Find a file by file name. |
| bool PyDescriptorDatabase::FindFileByName(const string& filename, |
| FileDescriptorProto* output) { |
| ScopedPyObjectPtr py_descriptor(PyObject_CallMethod( |
| py_database_, "FindFileByName", "s#", filename.c_str(), filename.size())); |
| return GetFileDescriptorProto(py_descriptor.get(), output); |
| } |
| |
| // Find the file that declares the given fully-qualified symbol name. |
| bool PyDescriptorDatabase::FindFileContainingSymbol( |
| const string& symbol_name, FileDescriptorProto* output) { |
| ScopedPyObjectPtr py_descriptor( |
| PyObject_CallMethod(py_database_, "FindFileContainingSymbol", "s#", |
| symbol_name.c_str(), symbol_name.size())); |
| return GetFileDescriptorProto(py_descriptor.get(), output); |
| } |
| |
| // Find the file which defines an extension extending the given message type |
| // with the given field number. |
| // Python DescriptorDatabases are not required to implement this method. |
| bool PyDescriptorDatabase::FindFileContainingExtension( |
| const string& containing_type, int field_number, |
| FileDescriptorProto* output) { |
| ScopedPyObjectPtr py_method( |
| PyObject_GetAttrString(py_database_, "FindFileContainingExtension")); |
| if (py_method == NULL) { |
| // This method is not implemented, returns without error. |
| PyErr_Clear(); |
| return false; |
| } |
| ScopedPyObjectPtr py_descriptor( |
| PyObject_CallFunction(py_method.get(), "s#i", containing_type.c_str(), |
| containing_type.size(), field_number)); |
| return GetFileDescriptorProto(py_descriptor.get(), output); |
| } |
| |
| } // namespace python |
| } // namespace protobuf |
| } // namespace google |