EPlugin : Initial commit for python support for eplugins.

svn path=/trunk/; revision=35626

plugins/python/python-plugin-loader.c

@@ -0,0 +1,191 @@
+ /* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*-
+ *
+ *  Author: Johnny Jacob <jjohnny@novell.com>
+ *
+ *  Copyright 2008 Novell, Inc. (www.novell.com)
+ *
+ *  This program is free software; you can redistribute it and/or
+ *  modify it under the terms of version 2 of the GNU General Public
+ *  License as published by the Free Software Foundation.
+ *
+ *  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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ */
+
+#include <sys/types.h>
+#include <string.h>
+#include <Python.h>
+
+#include "python-plugin-loader.h"
+
+#define d(x) 
+
+static void *epp_parent_class;
+
+typedef struct _EPluginPythonPrivate {
+        PyObject *pModule;
+        PyObject *pClass;
+	PyObject *pFunc;
+	PyObject *pDict;
+	GHashTable *methods;
+} EPluginPythonPrivate;
+
+#define epp ((EPluginPython *)ep)
+
+void * load_plugin_type_register_function (void *a, void *b);
+
+static char *
+get_xml_prop(xmlNodePtr node, const char *id)
+{
+	char *p = xmlGetProp(node, id);
+	char *out = NULL;
+
+	if (p) {
+		out = g_strdup(p);
+		xmlFree(p);
+	}
+
+	return out;
+}
+
+static void *
+epp_invoke(EPlugin *ep, const char *name, void *data)
+{
+	EPluginPythonPrivate *p = epp->priv;
+	PyObject *pModuleName, *pFunc;
+	PyObject *pInstance, *pValue = NULL;
+
+	/* we need to do this every time since we may be called from any thread for some uses */
+	Py_Initialize();
+
+	if (p->pModule == NULL) {
+	        pModuleName = PyString_FromString(epp->module_name);
+
+		PyRun_SimpleString(g_strdup_printf ("import sys ; sys.path.insert(0, '%s')", epp->location));
+
+		p->pModule = PyImport_Import(pModuleName);
+
+		Py_DECREF(pModuleName); //Free
+
+		if (p->pModule == NULL) {
+			PyErr_Print();
+			g_warning("can't load python module '%s'", epp->location);
+			return NULL;
+		}
+
+		p->pDict = PyModule_GetDict(p->pModule);
+
+		if (epp->pClass) {
+			p->pClass = PyDict_GetItemString(p->pDict, epp->pClass);			
+		}
+	}
+
+	if (p->pClass) {
+
+		if (PyCallable_Check(p->pClass)) 
+			pInstance = PyObject_CallObject(p->pClass, NULL); 
+
+		pValue = PyObject_CallMethod(pInstance, name, NULL);
+	       
+	} else {
+
+		pFunc = PyDict_GetItemString(p->pDict, name);
+
+		if (pFunc && PyCallable_Check(pFunc))
+			pValue = PyObject_CallObject(pFunc, NULL);
+		else
+			PyErr_Print();
+	}
+
+	if (pValue) {
+		d(printf("%s(%d):%s: Result of call: %ld \n", __FILE__, __LINE__, __PRETTY_FUNCTION__, PyInt_AsLong(pValue)));
+                Py_DECREF(pValue);
+		/* Fixme */
+		return NULL;
+	} else
+		return NULL;
+}
+
+static int
+epp_construct(EPlugin *ep, xmlNodePtr root)
+{
+	if (((EPluginClass *)epp_parent_class)->construct(ep, root) == -1)
+		return -1;
+
+	epp->location = get_xml_prop(root, "location");
+	epp->module_name = get_xml_prop (root, "module_name");
+	epp->pClass = get_xml_prop(root, "pClass");
+
+	if (epp->location == NULL)
+		return -1;
+
+	return 0;
+}
+
+static void
+epp_finalise(GObject *o)
+{
+	EPlugin *ep = (EPlugin *)o;
+	EPluginPythonPrivate *p = epp->priv;
+
+	g_free(epp->location);
+	g_free(epp->module_name);
+	g_free(epp->pClass);
+
+	g_hash_table_destroy(p->methods);
+
+	g_free(epp->priv);
+
+	((GObjectClass *)epp_parent_class)->finalize(o);
+}
+
+static void
+epp_class_init(EPluginClass *klass)
+{
+	((GObjectClass *)klass)->finalize = epp_finalise;
+	klass->construct = epp_construct;
+	klass->invoke = epp_invoke;
+	klass->type = "python";
+}
+
+static void
+epp_init(GObject *o)
+{
+	EPlugin *ep = (EPlugin *)o;
+
+	epp->priv = g_malloc0(sizeof(*epp->priv));
+	epp->priv->methods = g_hash_table_new_full(
+		g_str_hash, g_str_equal,
+		(GDestroyNotify) g_free,
+		(GDestroyNotify) NULL);
+}
+
+void *
+load_plugin_type_register_function (void *a, void *b)
+{
+	static GType type = 0;
+
+	if (!type) {
+		static const GTypeInfo info = {
+			sizeof(EPluginPythonClass), NULL, NULL, (GClassInitFunc) epp_class_init, NULL, NULL,
+			sizeof(EPluginPython), 0, (GInstanceInitFunc) epp_init,
+		};
+
+		epp_parent_class = g_type_class_ref(e_plugin_get_type());
+		type = g_type_register_static(e_plugin_get_type(), "EPluginPython", &info, 0);
+		e_plugin_register_type (type);
+
+		d(printf("\nType EPluginPython registered from the python-plugin-loader\n"));
+
+		Py_Initialize(); //TODO : Does this mean i can cache the instance of pyobjects ?
+	}
+
+	return GUINT_TO_POINTER(type);
+}