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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_modpython_hpp
#define tuscany_modpython_hpp
/**
* Evaluation functions used by mod-eval to evaluate Python
* component implementations.
*/
#include "string.hpp"
#include "stream.hpp"
#include "function.hpp"
#include "list.hpp"
#include "value.hpp"
#include "monad.hpp"
#include "eval.hpp"
namespace tuscany {
namespace server {
namespace modpython {
/**
* Apply a Python component implementation function.
*/
struct applyImplementation {
PyObject* impl;
const list<value> px;
python::PythonRuntime& py;
applyImplementation(PyObject* impl, const list<value>& px, python::PythonRuntime& py) : impl(impl), px(px), py(py) {
}
const value operator()(const list<value>& params) const {
const value expr = append<value>(params, px);
debug(expr, "modeval::python::applyImplementation::input");
const failable<value> res = python::evalScript(expr, impl, py);
const value val = !hasContent(res)? mklist<value>(value(), reason(res)) : mklist<value>(content(res));
debug(val, "modeval::python::applyImplementation::result");
return val;
}
};
/**
* Evaluate a Python component implementation and convert it to an applicable
* lambda function.
*/
const failable<lambda<value(const list<value>&)> > evalImplementation(const string& path, const value& impl, const list<value>& px, python::PythonRuntime& py) {
const string spath(attributeValue("script", impl));
const string fpath(path + spath);
ifstream is(fpath);
if (fail(is))
return mkfailure<lambda<value(const list<value>&)> >(string("Could not read implementation: ") + fpath);
const failable<PyObject*> script = python::readScript(python::moduleName(spath), fpath, is, py);
if (!hasContent(script))
return mkfailure<lambda<value(const list<value>&)> >(reason(script));
return lambda<value(const list<value>&)>(applyImplementation(content(script), px, py));
}
}
}
}
#endif /* tuscany_modpython_hpp */
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