Get info from xml operational datastore

- obtain one or multiple node values

radio/fhi_72/mplane/CMakeLists.txt

@@ -29,6 +29,7 @@ target_sources(oran_fhlib_5g_mplane PRIVATE
                connect-mplane.c
                rpc-send-recv.c
                get-mplane.c
+               xml/get-xml.c
 )
 
 pkg_check_modules(libyang REQUIRED libyang)

radio/fhi_72/mplane/xml/get-xml.c

@@ -0,0 +1,95 @@
+/*
+ * Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The OpenAirInterface Software Alliance licenses this file to You under
+ * the OAI Public License, Version 1.1  (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.openairinterface.org/?page_id=698
+ *
+ * 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.
+ *-------------------------------------------------------------------------------
+ * For more information about the OpenAirInterface (OAI) Software Alliance:
+ *      contact@openairinterface.org
+ */
+
+#include "get-xml.h"
+
+#include <libxml/parser.h>
+#include <string.h>
+
+static char *find_ru_xml_node(xmlNode *node, const char *filter)
+{
+  for (xmlNode *cur_node = node; cur_node; cur_node = cur_node->next) {
+    if (cur_node->type != XML_ELEMENT_NODE)
+      continue;
+
+    if (strcmp((const char *)cur_node->name, filter) == 0) {
+      xmlNode *target_node = cur_node;
+
+      for(xmlNode *cur_node2 = cur_node->children; cur_node2; cur_node2 = cur_node2->next) {
+        if (cur_node2->type == XML_ELEMENT_NODE && strcmp((const char *)cur_node2->name, "name") == 0) {
+          target_node = cur_node2;
+          break;
+        }
+      }
+      return (char *)xmlNodeGetContent(target_node);
+    }
+    char *answer = find_ru_xml_node(cur_node->children, filter);
+    if (answer != NULL) {
+      return answer;
+    }
+  }
+  return NULL;
+}
+
+char *get_ru_xml_node(const char *buffer, const char *filter)
+{
+  // Initialize the xml file
+  size_t len = strlen(buffer) + 1;
+  xmlDoc *doc = xmlReadMemory(buffer, len, NULL, NULL, 0);
+  xmlNode *root_element = xmlDocGetRootElement(doc);
+
+  return find_ru_xml_node(root_element->children, filter);
+}
+
+static void find_ru_xml_list(xmlNode *node, const char *filter, char ***match_list, size_t *count)
+{
+  for (xmlNode *cur_node = node; cur_node; cur_node = cur_node->next) {
+    if (cur_node->type != XML_ELEMENT_NODE)
+      continue;
+    if (strcmp((const char *)cur_node->name, filter) == 0) {
+      xmlNode *name_node = NULL;
+
+      for (xmlNode *cur_node2 = cur_node->children; cur_node2; cur_node2 = cur_node2->next) {
+        if (cur_node2->type == XML_ELEMENT_NODE && strcmp((const char *)cur_node2->name, "name") == 0) {
+          name_node = cur_node2;
+          break;
+        }
+      }
+      const char *content = (const char *)xmlNodeGetContent(name_node ? name_node : cur_node);
+      if (content) {
+        *match_list = realloc(*match_list, (*count + 1) * sizeof(char *));
+        (*match_list)[*count] = strdup(content);
+        (*count)++;
+      }
+    }
+    find_ru_xml_list(cur_node->children, filter, match_list, count);
+  }
+}
+
+void get_ru_xml_list(const char *buffer, const char *filter, char ***match_list, size_t *count)
+{
+  // Initialize the xml file
+  size_t len = strlen(buffer) + 1;
+  xmlDoc *doc = xmlReadMemory(buffer, len, NULL, NULL, 0);
+  xmlNode *root_element = xmlDocGetRootElement(doc);
+
+  find_ru_xml_list(root_element->children, filter, match_list, count);
+}

radio/fhi_72/mplane/xml/get-xml.h

@@ -0,0 +1,48 @@
+/*
+ * Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The OpenAirInterface Software Alliance licenses this file to You under
+ * the OAI Public License, Version 1.1  (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.openairinterface.org/?page_id=698
+ *
+ * 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.
+ *-------------------------------------------------------------------------------
+ * For more information about the OpenAirInterface (OAI) Software Alliance:
+ *      contact@openairinterface.org
+ */
+
+#ifndef GET_MPLANE_INFO_XML_H
+#define GET_MPLANE_INFO_XML_H
+
+#include <stdio.h>
+#include <stdbool.h>
+
+/**
+ * @brief retrieves the node value that matches filter.
+ *
+ * @param[in] buffer Buffer in xml format.
+ * @param[in] filter The node name (matching criteria).
+ * @return Expected one string that matches the node name.
+ */
+char *get_ru_xml_node(const char *buffer, const char *filter);
+
+/**
+ * @brief retrieves the node values that matches filter.
+ *
+ * @param[in] buffer Buffer in xml format.
+ * @param[in] filter The node name (matching criteria).
+ * @param[out] match_list Resulting list containing node values.
+ * @param[out] count The number of nodes that match criteria.
+ * @return Void.
+ */
+void get_ru_xml_list(const char *buffer, const char *filter, char ***match_list, size_t *count);
+
+#endif /* GET_MPLANE_INFO_XML_H */