Add helper functions, findObjects and dumpObject (sonic-net#716)

findObjects: Find out objects that have expected attribute
dumpObject: dump object attributes to vector<sai_attributes_t> according to specified object id

Signed-off-by: Ze Gan <ganze718@gmail.com>

vslib/inc/SwitchStateBase.h

@@ -438,6 +438,17 @@ namespace saivs
             void send_fdb_event_notification(
                     _In_ const sai_fdb_event_notification_data_t& data);
 
+        protected:
+
+            void findObjects(
+                    _In_ sai_object_type_t object_type,
+                    _In_ const sai_attribute_t &expect,
+                    _Out_ std::vector<sai_object_id_t> &objects);
+
+            bool dumpObject(
+                    _In_ const sai_object_id_t object_id,
+                    _Out_ std::vector<sai_attribute_t> &attrs);
+
         protected:
 
             constexpr static const int maxDebugCounters = 32;

vslib/src/SwitchStateBase.cpp

@@ -2661,3 +2661,52 @@ sai_status_t SwitchStateBase::refresh_system_port_list(
 
     return SAI_STATUS_SUCCESS;
 }
+
+void SwitchStateBase::findObjects(
+        _In_ sai_object_type_t object_type,
+        _In_ const sai_attribute_t &expect,
+        _Out_ std::vector<sai_object_id_t> &objects)
+{
+    SWSS_LOG_ENTER();
+
+    objects.clear();
+
+    SaiAttrWrap expect_wrap(object_type, &expect);
+
+    for (auto &obj : m_objectHash.at(object_type))
+    {
+        auto attr_itr = obj.second.find(expect_wrap.getAttrMetadata()->attridname);
+
+        if (attr_itr != obj.second.end()
+                && attr_itr->second->getAttrStrValue() == expect_wrap.getAttrStrValue())
+        {
+            sai_object_id_t object_id;
+            sai_deserialize_object_id(obj.first, object_id);
+            objects.push_back(object_id);
+        }
+    }
+}
+
+bool SwitchStateBase::dumpObject(
+        _In_ const sai_object_id_t object_id,
+        _Out_ std::vector<sai_attribute_t> &attrs)
+{
+    SWSS_LOG_ENTER();
+
+    attrs.clear();
+
+    auto &objs = m_objectHash.at(objectTypeQuery(object_id));
+    auto obj = objs.find(sai_serialize_object_id(object_id));
+
+    if (obj == objs.end())
+    {
+        return false;
+    }
+
+    for (auto &attr : obj->second)
+    {
+        attrs.push_back(*attr.second->getAttr());
+    }
+
+    return true;
+}