[libvirt] [PATCH] hyperv: Reduce usage of libxml API functions

[Sri Ramanujam]

Slight refactor of the WMI serialization code to minimize mixing
openwsman and libxml2 APIs. The only usage of libxml2 APIs now is in
creating CDATA blocks, because the openwsman API does not provide that
functionality.
---
 src/hyperv/hyperv_wmi.c | 65 ++++++++++++-------------------------------------
 1 file changed, 16 insertions(+), 49 deletions(-)

diff --git a/src/hyperv/hyperv_wmi.c b/src/hyperv/hyperv_wmi.c
index 57125ae..99efa1c 100644
--- a/src/hyperv/hyperv_wmi.c
+++ b/src/hyperv/hyperv_wmi.c
@@ -489,17 +489,14 @@ hypervSerializeSimpleParam(hypervParamPtr p, const char *resourceUri,
 
 static int
 hypervSerializeEprParam(hypervParamPtr p, hypervPrivate *priv,
-        const char *resourceUri, WsXmlDocH doc, WsXmlNodeH *methodNode)
+        const char *resourceUri, WsXmlNodeH *methodNode)
 {
     int result = -1;
     WsXmlNodeH xmlNodeParam = NULL,
                xmlNodeTemp = NULL,
                xmlNodeAddr = NULL,
                xmlNodeRef = NULL;
-    xmlNodePtr xmlNodeAddrPtr = NULL,
-               xmlNodeRefPtr = NULL;
     WsXmlDocH xmlDocResponse = NULL;
-    xmlDocPtr docPtr = (xmlDocPtr) doc->parserDoc;
     WsXmlNsH ns = NULL;
     client_opt_t *options = NULL;
     filter_t *filter = NULL;
@@ -573,11 +570,6 @@ hypervSerializeEprParam(hypervParamPtr p, hypervPrivate *priv,
         goto cleanup;
     }
 
-    if (!(xmlNodeAddrPtr = xmlDocCopyNode((xmlNodePtr) xmlNodeAddr, docPtr, 1))) {
-        virReportError(VIR_ERR_INTERNAL_ERROR, "%s", _("Could not copy EPR address"));
-        goto cleanup;
-    }
-
     if (!(xmlNodeRef = ws_xml_get_child(xmlNodeTemp, 0, XML_NS_ADDRESSING,
             WSA_REFERENCE_PARAMETERS))) {
         virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
@@ -585,17 +577,11 @@ hypervSerializeEprParam(hypervParamPtr p, hypervPrivate *priv,
         goto cleanup;
     }
 
-    if (!(xmlNodeRefPtr = xmlDocCopyNode((xmlNodePtr) xmlNodeRef, docPtr, 1))) {
-        virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
-                _("Could not copy EPR item reference parameters"));
-        goto cleanup;
-    }
-
     /* now build a new xml doc with the EPR node children */
     if (!(xmlNodeParam = ws_xml_add_child(*methodNode, resourceUri,
                     p->epr.name, NULL))) {
         virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
-                _("Could not add child node to xmlNodeParam"));
+                _("Could not add child node to methodNode"));
         goto cleanup;
     }
 
@@ -613,23 +599,8 @@ hypervSerializeEprParam(hypervParamPtr p, hypervPrivate *priv,
         goto cleanup;
     }
 
-    if (xmlAddChild((xmlNodePtr) *methodNode, (xmlNodePtr) xmlNodeParam) == NULL) {
-        virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
-                _("Could not add child to xml parent node"));
-        goto cleanup;
-    }
-
-    if (xmlAddChild((xmlNodePtr) xmlNodeParam, xmlNodeAddrPtr) == NULL) {
-        virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
-                _("Could not add child to xml parent node"));
-        goto cleanup;
-    }
-
-    if (xmlAddChild((xmlNodePtr) xmlNodeParam, xmlNodeRefPtr) == NULL) {
-        virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
-                _("Could not add child to xml parent node"));
-        goto cleanup;
-    }
+    ws_xml_duplicate_tree(xmlNodeParam, xmlNodeAddr);
+    ws_xml_duplicate_tree(xmlNodeParam, xmlNodeRef);
 
     /* we did it! */
     result = 0;
@@ -656,8 +627,7 @@ hypervSerializeEmbeddedParam(hypervParamPtr p, const char *resourceUri,
                xmlNodeArray = NULL;
     WsXmlDocH xmlDocTemp = NULL,
               xmlDocCdata = NULL;
-    xmlBufferPtr xmlBufferNode = NULL;
-    const xmlChar *xmlCharCdataContent = NULL;
+    char *xmlCharCdataContent = NULL;
     xmlNodePtr xmlNodeCdata = NULL;
     hypervWmiClassInfoPtr classInfo = p->embedded.info;
     virHashKeyValuePairPtr items = NULL;
@@ -761,25 +731,22 @@ hypervSerializeEmbeddedParam(hypervParamPtr p, const char *resourceUri,
     }
 
     /* create CDATA node */
-    xmlBufferNode = xmlBufferCreate();
-    if (xmlNodeDump(xmlBufferNode, (xmlDocPtr) xmlDocTemp->parserDoc,
-                (xmlNodePtr) xmlNodeInstance, 0, 0) < 0) {
-        virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
-                _("Could not get root of temp XML doc"));
-        goto cleanup;
-    }
+    ws_xml_dump_memory_node_tree(xmlNodeInstance, &xmlCharCdataContent, &len);
 
-    len = xmlBufferLength(xmlBufferNode);
-    xmlCharCdataContent = xmlBufferContent(xmlBufferNode);
     if (!(xmlNodeCdata = xmlNewCDataBlock((xmlDocPtr) xmlDocCdata,
-                    xmlCharCdataContent, len))) {
+                    (xmlChar *)xmlCharCdataContent, len))) {
         virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
                 _("Could not create CDATA element"));
         goto cleanup;
     }
 
-    /* Add CDATA node to the doc root */
-    if (!(xmlAddChild((xmlNodePtr) xmlNodeParam, xmlNodeCdata))) {
+    /*
+     * Add CDATA node to the doc root
+     *
+     * FIXME: there is no openwsman wrapper for xmlNewCDataBlock, so instead
+     * silence clang by casting to a void pointer first
+     */
+    if (!(xmlAddChild((xmlNodePtr)(void *)xmlNodeParam, xmlNodeCdata))) {
         virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
                 _("Could not add CDATA to doc root"));
         goto cleanup;
@@ -792,7 +759,7 @@ hypervSerializeEmbeddedParam(hypervParamPtr p, const char *resourceUri,
     VIR_FREE(items);
     ws_xml_destroy_doc(xmlDocCdata);
     ws_xml_destroy_doc(xmlDocTemp);
-    xmlBufferFree(xmlBufferNode);
+    ws_xml_free_memory(xmlCharCdataContent);
     return result;
 }
 
@@ -854,7 +821,7 @@ hypervInvokeMethod(hypervPrivate *priv, hypervInvokeParamsListPtr params,
                 break;
             case HYPERV_EPR_PARAM:
                 if (hypervSerializeEprParam(p, priv, params->resourceUri,
-                            paramsDocRoot, &methodNode) < 0)
+                            &methodNode) < 0)
                     goto cleanup;
                 break;
             case HYPERV_EMBEDDED_PARAM:
-- 
2.9.4