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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
/* $Rev$ $Date$ */
#ifndef tuscany_python_pyio_hpp
#define tuscany_python_pyio_hpp
/**
* Hooks used to capture python stdout and stderr.
*/
#include <python2.6/Python.h>
#include "stream.hpp"
#include "../scheme/io.hpp"
namespace tuscany {
namespace python {
#ifdef _REENTRANT
__thread
#endif
ostream* displayOutStream = NULL;
#ifdef _REENTRANT
__thread
#endif
ostream* logOutStream = NULL;
/**
* Setup the display stream.
*/
const bool setupDisplay(ostream& out) {
scheme::setupDisplay(out);
displayOutStream = &out;
return true;
}
ostream& displayStream() {
if (displayOutStream == NULL)
return cout;
return *displayOutStream;
}
/**
* Setup the log stream.
*/
const bool setupLog(ostream& out) {
scheme::setupLog(out);
logOutStream = &out;
return true;
}
ostream& logStream() {
if (logOutStream == NULL)
return cerr;
return *logOutStream;
}
/**
* Hook method used to redirect python output to a stream.
*/
PyObject* display(unused PyObject* self, PyObject* args) {
char* s = NULL;
if (!PyArg_ParseTuple(args, "s", &s))
return NULL;
displayStream() << s;
Py_INCREF(Py_None);
return Py_None;
}
PyMethodDef displayHookMethods[] = {
{"display", display, METH_VARARGS, "Redirects stdout"},
{NULL, NULL, 0, NULL}};
/**
* Hook method used to redirect python errors to a stream.
*/
PyObject* log(unused PyObject* self, PyObject* args) {
char* s = NULL;
if (!PyArg_ParseTuple(args, "s", &s))
return NULL;
logStream() << s;
Py_INCREF(Py_None);
return Py_None;
}
PyMethodDef logHookMethods[] = {
{"log", log, METH_VARARGS, "Redirects stdout"},
{NULL, NULL, 0, NULL}};
/**
* Setup the display and log hooks.
*/
bool setupIO() {
Py_InitModule("displayhook", displayHookMethods);
PyRun_SimpleString(
"import sys\n"
"import displayhook\n"
"\n"
"class DisplayHook:\n"
" def write(self, text):\n"
" displayhook.display(text)\n"
"\n"
"sys.stdout = DisplayHook()\n");
Py_InitModule("loghook", logHookMethods);
PyRun_SimpleString(
"import sys\n"
"import loghook\n"
"\n"
"class LogHook:\n"
" def write(self, text):\n"
" loghook.log(text)\n"
"\n"
"sys.stderr = LogHook()\n");
return true;
}
/**
* Return the last python error.
*/
const string lastError() {
ostream* pos = logOutStream;
ostringstream eos;
logOutStream = &eos;
if (PyErr_Occurred())
PyErr_Print();
logOutStream = pos;
return str(eos);
}
/**
* Read and write values (using the scheme representation as it's the canonical
* representation used throughout the runtime.)
*/
const value readValue(istream& in) {
return scheme::readValue(in);
}
const bool writeValue(const value& val, ostream& out) {
return scheme::writeValue(val, out);
}
}
}
#endif /* tuscany_python_pyio_hpp */
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