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Add support for VirtualErrorHandlers in core sip

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Unfortunately requires a bunch of code to be duplicated from
QgsPythonUtilsImpl::getTraceback() into core.sip, but there's no way
to avoid this
This commit is contained in:
Nyall Dawson 2017-06-22 20:48:32 +10:00
parent 53e7ef88a3
commit d63d560eb3
1 changed files with 91 additions and 0 deletions
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91
python/core/core.sip
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@ -1,6 +1,93 @@
%Module(name=qgis._core,
keyword_arguments="Optional")
%ModuleCode
#include "qgsprocessingexception.h"
QString getTraceback()
{
#define TRACEBACK_FETCH_ERROR(what) {errMsg = what; goto done;}
// acquire global interpreter lock to ensure we are in a consistent state
PyGILState_STATE gstate;
gstate = PyGILState_Ensure();
QString errMsg;
QString result;
PyObject *modStringIO = nullptr;
PyObject *modTB = nullptr;
PyObject *obStringIO = nullptr;
PyObject *obResult = nullptr;
PyObject *type, *value, *traceback;
PyErr_Fetch( &type, &value, &traceback );
PyErr_NormalizeException( &type, &value, &traceback );
const char *iomod = "io";
modStringIO = PyImport_ImportModule( iomod );
if ( !modStringIO )
TRACEBACK_FETCH_ERROR( QString( "can't import %1" ).arg( iomod ) );
obStringIO = PyObject_CallMethod( modStringIO, ( char * ) "StringIO", nullptr );
/* Construct a cStringIO object */
if ( !obStringIO )
TRACEBACK_FETCH_ERROR( "cStringIO.StringIO() failed" );
modTB = PyImport_ImportModule( "traceback" );
if ( !modTB )
TRACEBACK_FETCH_ERROR( "can't import traceback" );
obResult = PyObject_CallMethod( modTB, ( char * ) "print_exception",
( char * ) "OOOOO",
type, value ? value : Py_None,
traceback ? traceback : Py_None,
Py_None,
obStringIO );
if ( !obResult )
TRACEBACK_FETCH_ERROR( "traceback.print_exception() failed" );
Py_DECREF( obResult );
obResult = PyObject_CallMethod( obStringIO, ( char * ) "getvalue", nullptr );
if ( !obResult )
TRACEBACK_FETCH_ERROR( "getvalue() failed." );
/* And it should be a string all ready to go - duplicate it. */
if ( !PyUnicode_Check( obResult ) )
TRACEBACK_FETCH_ERROR( "getvalue() did not return a string" );
result = QString::fromUtf8( PyUnicode_AsUTF8( obResult ) );
done:
// All finished - first see if we encountered an error
if ( result.isEmpty() && !errMsg.isEmpty() )
{
result = errMsg;
}
Py_XDECREF( modStringIO );
Py_XDECREF( modTB );
Py_XDECREF( obStringIO );
Py_XDECREF( obResult );
Py_XDECREF( value );
Py_XDECREF( traceback );
Py_XDECREF( type );
// we are done calling python API, release global interpreter lock
PyGILState_Release( gstate );
return result;
}
%End
%Import QtXml/QtXmlmod.sip
%Import QtNetwork/QtNetworkmod.sip
%Import QtSql/QtSqlmod.sip
@ -413,3 +500,7 @@
%Include expression/qgsexpressionnodeimpl.sip
%Include expression/qgsexpressionnode.sip
%Include expression/qgsexpressionfunction.sip
%VirtualErrorHandler processing_exception_handler
throw QgsProcessingException( getTraceback() );
%End