Method LoadPlugin

gcore/gdalpythondriverloader.cpp:1570–1631

/************************************************************************/

bool PythonPluginDriver::LoadPlugin()
{
    CPLMutexHolder oMutexHolder(&m_hMutex);
    if (m_poPlugin)
        return true;
    if (!InitializePythonAndLoadGDALPythonDriverModule())
        return false;
    GIL_Holder oHolder(false);

    CPLString osStr;
    VSILFILE *fp = VSIFOpenL(m_osFilename, "rb");
    VSIFSeekL(fp, 0, SEEK_END);
    auto nSize = VSIFTellL(fp);
    if (nSize > 10 * 1024 * 1024)
    {
        VSIFCloseL(fp);
        return false;
    }
    VSIFSeekL(fp, 0, SEEK_SET);
    osStr.resize(static_cast<size_t>(nSize));
    VSIFReadL(&osStr[0], 1, static_cast<size_t>(nSize), fp);
    VSIFCloseL(fp);
    PyObject *poCompiledString =
        Py_CompileString(osStr, m_osFilename, Py_file_input);
    if (poCompiledString == nullptr || PyErr_Occurred())
    {
        CPLError(CE_Failure, CPLE_AppDefined, "Couldn't compile code:\n%s",
                 GetPyExceptionString().c_str());
        return false;
    }
    const CPLString osPluginModuleName(CPLGetBasenameSafe(m_osFilename));
    PyObject *poModule =
        PyImport_ExecCodeModule(osPluginModuleName, poCompiledString);
    Py_DecRef(poCompiledString);

    if (poModule == nullptr || PyErr_Occurred())
    {
        CPLError(CE_Failure, CPLE_AppDefined, "%s",
                 GetPyExceptionString().c_str());
        return false;
    }

    PyObject *poInstantiate = PyObject_GetAttrString(gpoGDALPythonDriverModule,
                                                     "_instantiate_plugin");
    CPLAssert(poInstantiate);

    PyObject *pyArgs = PyTuple_New(1);
    PyTuple_SetItem(pyArgs, 0, poModule);
    PyObject *poPlugin = PyObject_Call(poInstantiate, pyArgs, nullptr);
    Py_DecRef(pyArgs);
    Py_DecRef(poInstantiate);

    if (ErrOccurredEmitCPLError())
    {
        return false;
    }
    else
    {