PothosPython/PythonHandle.cpp at master · pothosware/PothosPython · GitHub

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// Copyright (c) 2013-2017 Josh Blum
// SPDX-License-Identifier: BSL-1.0

#include<Poco/Format.h>
#include<cassert>
#include<iostream>
#include"PythonProxy.hpp"

PythonProxyHandle::PythonProxyHandle(std::shared_ptr<PythonProxyEnvironment> env, PyObject *obj, constbool borrowed):
 env(env), obj(obj)
{
 PyGilStateLock lock;
 ref = PyObjectRef(obj, borrowed);
}

PythonProxyHandle::~PythonProxyHandle(void)
{
 PyGilStateLock lock;
 ref = PyObjectRef();
}

intPythonProxyHandle::compareTo(const Pothos::Proxy &proxy) const
{
 PyGilStateLock lock;
int rEq = 0, rGt = 0, rLt = 0;
 rEq = PyObject_RichCompareBool(obj, env->getHandle(proxy)->obj, Py_EQ);
if (rEq == 1) return0;
if (rEq == -1) goto fail;
 rGt = PyObject_RichCompareBool(obj, env->getHandle(proxy)->obj, Py_GT);
if (rGt == 1) return +1;
if (rGt == -1) goto fail;
 rLt = PyObject_RichCompareBool(obj, env->getHandle(proxy)->obj, Py_LT);
if (rLt == 1) return -1;
if (rLt == -1) goto fail;
 fail:
constint r = 0;
auto errorMsg = getErrorString();
if (not errorMsg.empty())
 {
throwPothos::ProxyCompareError("PythonProxyHandle::compareTo()", errorMsg);
 }
return r;
}

size_tPythonProxyHandle::hashCode(void) const
{
 PyGilStateLock lock;
returnsize_t(PyObject_Hash(obj));
}

std::string PythonProxyHandle::toString(void) const
{
 PyGilStateLock lock;
 PyObjectRef str(PyObject_Str(obj), REF_NEW);
returnPyObjToStdString(str.obj);
}

std::string PythonProxyHandle::getClassName(void) const
{
 PyGilStateLock lock;

 PyObjectRef cls(PyObject_GetAttrString(obj, "__class__"), REF_NEW);
 PyObjectRef clsName(PyObject_GetAttrString(cls.obj, "__name__"), REF_NEW);
 PyObjectRef modName(PyObject_GetAttrString(cls.obj, "__module__"), REF_NEW);

constauto clsNameStr = PyObjToStdString(clsName.obj);
constauto modNameStr = PyObjToStdString(modName.obj);

 #if PY_MAJOR_VERSION >= 3
if (modNameStr == "builtins") return clsNameStr;
 #else
if (modNameStr == "__builtin__") return clsNameStr;
 #endif

return modNameStr + "." + clsNameStr;
}

Pothos::Proxy PythonProxyHandle::call(const std::string &name, const Pothos::Proxy *args, constsize_t numArgs)
{
 PyGilStateLock lock;
if (this->obj == nullptr) throwPothos::ProxyHandleCallError(
"PythonProxyHandle::call("+name+")", "cant call on a null object");

/*******************************************************************
 * Step 0) handle field accessors and mutators
 ******************************************************************/
constauto colon = name.find(":");
if (colon != std::string::npos)
 {
 PyObjectRef result(Py_None, REF_BORROWED);

if (name.substr(0, colon) == "set"and numArgs == 1)
 {
PyObject_SetAttrString(this->obj, name.substr(colon+1).c_str(), env->getHandle(args[0])->obj);
 }
elseif (name.substr(0, colon) == "get"and numArgs == 0)
 {
 result = PyObjectRef(PyObject_GetAttrString(this->obj, name.substr(colon+1).c_str()), REF_NEW);
 }
elsethrowPothos::ProxyHandleCallError(
"PythonProxyHandle::call("+name+")", "unknown operation");

auto errorMsg = getErrorString();
if (not errorMsg.empty())
 {
throwPothos::ProxyExceptionMessage(errorMsg);
 }
return env->makeHandle(result);
 }

/*******************************************************************
 * Step 1) locate the callable object
 ******************************************************************/
 PyObjectRef attrObj;

if (name.empty() or name == "()") attrObj = PyObjectRef(ref);
else attrObj = PyObjectRef(PyObject_GetAttrString(this->obj, name.c_str()), REF_NEW);

if (attrObj.obj == nullptr)
 {
throwPothos::ProxyHandleCallError(
"PythonProxyHandle::call("+name+")",
Poco::format("no attribute on %s", this->toString()));
 }

if (notPyCallable_Check(attrObj.obj))
 {
if (numArgs == 0) return env->makeHandle(attrObj); //access a field
elsethrowPothos::ProxyHandleCallError(
"PythonProxyHandle::call("+name+")",
Poco::format("cant call on %s", this->toString()));
 }

/*******************************************************************
 * Step 2) create tuple of arguments
 ******************************************************************/
 PyObjectRef argsObj(PyTuple_New(numArgs), REF_NEW);
 std::vector<std::shared_ptr<PythonProxyHandle>> argHandles(numArgs);
for (size_t i = 0; i < numArgs; i++)
 {
 argHandles[i] = env->getHandle(args[i]);
PyTuple_SetItem(argsObj.obj, i, argHandles[i]->ref.newRef());
 }

/*******************************************************************
 * Step 4) call into the callable object
 ******************************************************************/
 PyObjectRef result(PyObject_CallObject(attrObj.obj, argsObj.obj), REF_NEW);

/*******************************************************************
 * Step 5) exception handling and reporting
 ******************************************************************/
auto errorMsg = getErrorString();
if (not errorMsg.empty())
 {
throwPothos::ProxyExceptionMessage(errorMsg);
 }

auto x = env->makeHandle(result);
if (x.getClassName() == "PothosProxy") return x.convert<Pothos::Proxy>();
return x;
}