protobuf/python/google/protobuf/pyext/message_module.cc

// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc.  All rights reserved.
// https://developers.google.com/protocol-buffers/
//
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// 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
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#include <Python.h>

#include <google/protobuf/pyext/message.h>
#include <google/protobuf/proto_api.h>

#include <google/protobuf/message_lite.h>

namespace {

// C++ API.  Clients get at this via proto_api.h
struct ApiImplementation : google::protobuf::python::PyProto_API {
  const google::protobuf::Message* GetMessagePointer(PyObject* msg) const override {
    return google::protobuf::python::PyMessage_GetMessagePointer(msg);
  }
  google::protobuf::Message* GetMutableMessagePointer(PyObject* msg) const override {
    return google::protobuf::python::PyMessage_GetMutableMessagePointer(msg);
  }
};

}  // namespace

static const char module_docstring[] =
"python-proto2 is a module that can be used to enhance proto2 Python API\n"
"performance.\n"
"\n"
"It provides access to the protocol buffers C++ reflection API that\n"
"implements the basic protocol buffer functions.";

static PyMethodDef ModuleMethods[] = {
  {"SetAllowOversizeProtos",
    (PyCFunction)google::protobuf::python::cmessage::SetAllowOversizeProtos,
    METH_O, "Enable/disable oversize proto parsing."},
  // DO NOT USE: For migration and testing only.
  { NULL, NULL}
};

#if PY_MAJOR_VERSION >= 3
static struct PyModuleDef _module = {
  PyModuleDef_HEAD_INIT,
  "_message",
  module_docstring,
  -1,
  ModuleMethods,  /* m_methods */
  NULL,
  NULL,
  NULL,
  NULL
};
#define INITFUNC PyInit__message
#define INITFUNC_ERRORVAL NULL
#else  // Python 2
#define INITFUNC init_message
#define INITFUNC_ERRORVAL
#endif

PyMODINIT_FUNC INITFUNC() {
  PyObject* m;
#if PY_MAJOR_VERSION >= 3
  m = PyModule_Create(&_module);
#else
  m = Py_InitModule3("_message", ModuleMethods, module_docstring);
#endif
  if (m == NULL) {
    return INITFUNC_ERRORVAL;
  }

  if (!google::protobuf::python::InitProto2MessageModule(m)) {
    Py_DECREF(m);
    return INITFUNC_ERRORVAL;
  }

  // Adds the C++ API
  if (PyObject* api =
          PyCapsule_New(new ApiImplementation(),
                        google::protobuf::python::PyProtoAPICapsuleName(), NULL)) {
    PyModule_AddObject(m, "proto_API", api);
  } else {
    return INITFUNC_ERRORVAL;
  }

#if PY_MAJOR_VERSION >= 3
  return m;
#endif
}