python: Use PyCapsule API if available

On Fedore 14, virt-manager spews a bunch of warnings to the console:

/usr/lib64/python2.7/site-packages/libvirt.py:1781: PendingDeprecationWarning: The CObject type is marked Pending Deprecation in Python 2.7.  Please use capsule objects instead.

Have libvirt use the capsule API if available. I've verified this compiles
fine on older python (2.6 in RHEL6 which doesn't have capsules), and
virt-manager seems to function fine.

python/typewrappers.c

@@ -16,6 +16,26 @@
 
 #include "typewrappers.h"
 
+#ifndef Py_CAPSULE_H
+typedef void(*PyCapsule_Destructor)(void *, void *);
+#endif
+
+static PyObject *
+libvirt_buildPyObject(void *cobj,
+                      const char *name,
+                      PyCapsule_Destructor destr)
+{
+    PyObject *ret;
+
+#ifdef Py_CAPSULE_H
+    ret = PyCapsule_New(cobj, name, destr);
+#else
+    ret = PyCObject_FromVoidPtrAndDesc(cobj, (void *) name, destr);
+#endif /* _TEST_CAPSULE */
+
+    return ret;
+}
+
 PyObject *
 libvirt_intWrap(int val)
 {
@@ -105,9 +125,8 @@ libvirt_virDomainPtrWrap(virDomainPtr node)
         Py_INCREF(Py_None);
         return (Py_None);
     }
-    ret =
-        PyCObject_FromVoidPtrAndDesc((void *) node, (char *) "virDomainPtr",
-                                     NULL);
+
+    ret = libvirt_buildPyObject(node, "virDomainPtr", NULL);
     return (ret);
 }
 
@@ -120,9 +139,8 @@ libvirt_virNetworkPtrWrap(virNetworkPtr node)
         Py_INCREF(Py_None);
         return (Py_None);
     }
-    ret =
-        PyCObject_FromVoidPtrAndDesc((void *) node, (char *) "virNetworkPtr",
-                                     NULL);
+
+    ret = libvirt_buildPyObject(node, "virNetworkPtr", NULL);
     return (ret);
 }
 
@@ -135,9 +153,8 @@ libvirt_virInterfacePtrWrap(virInterfacePtr node)
         Py_INCREF(Py_None);
         return (Py_None);
     }
-    ret =
-        PyCObject_FromVoidPtrAndDesc((void *) node, (char *) "virInterfacePtr",
-                                     NULL);
+
+    ret = libvirt_buildPyObject(node, "virInterfacePtr", NULL);
     return (ret);
 }
 
@@ -150,9 +167,8 @@ libvirt_virStoragePoolPtrWrap(virStoragePoolPtr node)
         Py_INCREF(Py_None);
         return (Py_None);
     }
-    ret =
-        PyCObject_FromVoidPtrAndDesc((void *) node, (char *) "virStoragePoolPtr",
-                                     NULL);
+
+    ret = libvirt_buildPyObject(node, "virStoragePoolPtr", NULL);
     return (ret);
 }
 
@@ -165,9 +181,8 @@ libvirt_virStorageVolPtrWrap(virStorageVolPtr node)
         Py_INCREF(Py_None);
         return (Py_None);
     }
-    ret =
-        PyCObject_FromVoidPtrAndDesc((void *) node, (char *) "virStorageVolPtr",
-                                     NULL);
+
+    ret = libvirt_buildPyObject(node, "virStorageVolPtr", NULL);
     return (ret);
 }
 
@@ -180,9 +195,8 @@ libvirt_virConnectPtrWrap(virConnectPtr node)
         Py_INCREF(Py_None);
         return (Py_None);
     }
-    ret =
-        PyCObject_FromVoidPtrAndDesc((void *) node, (char *) "virConnectPtr",
-                                     NULL);
+
+    ret = libvirt_buildPyObject(node, "virConnectPtr", NULL);
     return (ret);
 }
 
@@ -195,9 +209,8 @@ libvirt_virNodeDevicePtrWrap(virNodeDevicePtr node)
         Py_INCREF(Py_None);
         return (Py_None);
     }
-    ret =
-        PyCObject_FromVoidPtrAndDesc((void *) node, (char *) "virNodeDevicePtr",
-                                     NULL);
+
+    ret = libvirt_buildPyObject(node, "virNodeDevicePtr", NULL);
     return (ret);
 }
 
@@ -210,7 +223,8 @@ libvirt_virSecretPtrWrap(virSecretPtr node)
         Py_INCREF(Py_None);
         return Py_None;
     }
-    ret = PyCObject_FromVoidPtrAndDesc(node, (char *) "virSecretPtr", NULL);
+
+    ret = libvirt_buildPyObject(node, "virSecretPtr", NULL);
     return (ret);
 }
 
@@ -223,7 +237,8 @@ libvirt_virNWFilterPtrWrap(virNWFilterPtr node)
         Py_INCREF(Py_None);
         return Py_None;
     }
-    ret = PyCObject_FromVoidPtrAndDesc(node, (char *) "virNWFilterPtr", NULL);
+
+    ret = libvirt_buildPyObject(node, "virNWFilterPtr", NULL);
     return (ret);
 }
 
@@ -236,7 +251,8 @@ libvirt_virStreamPtrWrap(virStreamPtr node)
         Py_INCREF(Py_None);
         return Py_None;
     }
-    ret = PyCObject_FromVoidPtrAndDesc(node, (char *) "virStreamPtr", NULL);
+
+    ret = libvirt_buildPyObject(node, "virStreamPtr", NULL);
     return (ret);
 }
 
@@ -249,9 +265,8 @@ libvirt_virDomainSnapshotPtrWrap(virDomainSnapshotPtr node)
         Py_INCREF(Py_None);
         return (Py_None);
     }
-    ret =
-        PyCObject_FromVoidPtrAndDesc((void *) node, (char *) "virDomainSnapshotPtr",
-                                     NULL);
+
+    ret = libvirt_buildPyObject(node, "virDomainSnapshotPtr", NULL);
     return (ret);
 }
 
@@ -265,9 +280,8 @@ libvirt_virEventHandleCallbackWrap(virEventHandleCallback node)
         printf("%s: WARNING - Wrapping None\n", __func__);
         return (Py_None);
     }
-    ret =
-        PyCObject_FromVoidPtrAndDesc((void *) node, (char *) "virEventHandleCallback",
-                                     NULL);
+
+    ret = libvirt_buildPyObject(node, "virEventHandleCallback", NULL);
     return (ret);
 }
 
@@ -281,9 +295,8 @@ libvirt_virEventTimeoutCallbackWrap(virEventTimeoutCallback node)
         Py_INCREF(Py_None);
         return (Py_None);
     }
-    ret =
-        PyCObject_FromVoidPtrAndDesc((void *) node, (char *) "virEventTimeoutCallback",
-                                     NULL);
+
+    ret = libvirt_buildPyObject(node, "virEventTimeoutCallback", NULL);
     return (ret);
 }
 
@@ -296,9 +309,8 @@ libvirt_virFreeCallbackWrap(virFreeCallback node)
         Py_INCREF(Py_None);
         return (Py_None);
     }
-    ret =
-        PyCObject_FromVoidPtrAndDesc((void *) node, (char *) "virFreeCallback",
-                                     NULL);
+
+    ret = libvirt_buildPyObject(node, "virFreeCallback", NULL);
     return (ret);
 }
 
@@ -311,8 +323,7 @@ libvirt_virVoidPtrWrap(void* node)
         Py_INCREF(Py_None);
         return (Py_None);
     }
-    ret =
-        PyCObject_FromVoidPtrAndDesc((void *) node, (char *) "void*",
-                                     NULL);
+
+    ret = libvirt_buildPyObject(node, "void*", NULL);
     return (ret);
 }