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/*
* bitz-server, An ICAP server implementation in C++
* Copyright (C) 2012 Uditha Atukorala
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "py.h"
#include "interface.h"
#include <bitz/config.h>
#include <bitz/logger.h>
namespace bitz {
Py::Py() : Modifier() {
// defaults
_pymodule = NULL;
// initialise Py::config_t values
_config.module_name = "modpy";
_config.module_path = "";
// load configs
load_configs();
// initialise python
init_python();
}
Py::~Py() {
// cleanup python
cleanup_python();
}
icap::Response * Py::modify( icap::Request * request ) throw() {
// get the modify response
return python_response( request, "modify" );
}
icap::Response * Py::preview( icap::Request * request ) throw() {
// get the preview response
return python_response( request, "preview" );
}
void Py::load_configs() throw() {
std::string s;
Config &server_config = Config::instance();
// interface module name
s = server_config.module_config( "modpy", "module_name" );
if ( s != "" ) {
_config.module_name = s;
}
// module lookup path
_config.module_path = server_config.module_config( "modpy", "module_path" );
}
void Py::init_python() throw() {
PyObject * sys_path;
PyObject * pymodule_path, * pymodule_name;
PyObject * pymethod;
PyObject * pyreturn;
// logger
Logger &logger = Logger::instance();
// python core
Py_Initialize();
// bitz python module
if ( Py_InitModule( "bitz", bitz_methods ) == NULL ) {
logger.warn( "[modpy] failed to init C interface module: bitz" );
}
// setup python environment
if ( _config.module_path != "" ) {
logger.debug( std::string( "[modpy] appending to sys.path, module_path: " ).append( _config.module_path ) );
sys_path = PySys_GetObject( (char *) "path" );
pymodule_path = PyString_FromString( _config.module_path.c_str() );
PyList_Append( sys_path, pymodule_path );
}
// load the interface module
logger.debug( std::string( "[modpy] interface module: " ).append( _config.module_name ) );
pymodule_name = PyString_FromString( _config.module_name.c_str() );
_pymodule = PyImport_Import( pymodule_name );
if ( _pymodule != NULL ) {
logger.debug( "[modpy] interface module loaded successfully" );
// call init() in the interface module
pymethod = PyObject_GetAttrString( _pymodule, "init" );
if ( pymethod && PyCallable_Check( pymethod ) ) {
pyreturn = PyObject_CallObject( pymethod, NULL );
Py_DECREF( pyreturn );
} else {
logger.warn ( "[modpy] failed to call init() in interface module" );
}
Py_DECREF( pymethod );
} else {
logger.warn( "[modpy] failed to load interface module" );
}
// cleanup
Py_DECREF( pymodule_name );
Py_DECREF( pymodule_path );
Py_DECREF( sys_path );
}
void Py::cleanup_python() throw() {
PyObject * pymethod;
PyObject * pyreturn;
// logger
Logger &logger = Logger::instance();
// cleanup
if ( _pymodule != NULL ) {
// call cleanup() in the interface module
pymethod = PyObject_GetAttrString( _pymodule, "cleanup" );
if ( pymethod && PyCallable_Check( pymethod ) ) {
pyreturn = PyObject_CallObject( pymethod, NULL );
Py_DECREF( pyreturn );
} else {
logger.warn ( "[modpy] failed to call cleanup() in interface module" );
}
Py_DECREF( pymethod );
Py_DECREF( _pymodule );
}
// finalise python core
Py_Finalize();
}
icap::Response * Py::python_response( icap::Request * request, const std::string &method ) throw() {
/*
* notes:
* + pass icap::Request to python module as a PyCapsule object
* so it can be used to grab the data needed using the C/C++ interface.
* + process data (within the python module) and use the C/C++ interface
* to create a icap::Response and pass it back to this method
* using a PyCapsule object
*/
icap::Response * response;
PyObject * pymethod;
PyObject * pyargs;
PyObject * pyrequest, * pyresponse;
// logger
Logger &logger = Logger::instance();
// initialise the response object
response = NULL;
// check for the interface module
if ( _pymodule != NULL ) {
/* call the [method]() in the interface module */
pymethod = PyObject_GetAttrString( _pymodule, method.c_str() );
pyargs = PyTuple_New( 1 );
pyrequest = PyCapsule_New( (void *) request, "request", NULL );
PyTuple_SetItem( pyargs, 0, pyrequest );
if ( pymethod && PyCallable_Check( pymethod ) ) {
// get the response capsule
pyresponse = PyObject_CallObject( pymethod, pyargs );
// sanity check
if ( pyresponse != NULL ) {
void * p = PyCapsule_GetPointer( pyresponse, "response" );
// sanity check
if ( p != NULL ) {
// construct the response
response = static_cast<icap::Response *>(p);
} else {
logger.warn( std::string( "[modpy] invalid capsule response, method: " ).append( method ) );
}
Py_DECREF( pyresponse );
} else {
logger.warn( std::string( "[modpy] response is NULL, method: " ).append( method ) );
}
} else {
logger.warn ( std::string( "[modpy] failed to call the method in interface module, method: " ).append( method ) );
}
// cleanup
// pyrequest is created from the reference passed in
Py_DECREF( pyargs );
Py_DECREF( pymethod );
}
// sanity check
if ( response == NULL ) {
response = new icap::Response( icap::ResponseHeader::SERVER_ERROR );
}
return response;
}
} /* end of namespace bitz */
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