Add InterfacesRemoved signal handling

When an InterfacesRemoved signal is received for a subscribed object
path, each interface returned is checked against the interface which was
defined for each object on the event. When these are equal, the
interface (and all associated properties) are removed from the shared
cache of event properties.

Tested:
    Manually added an InterfacesRemoved signal
    Verified interface was removed from object path in cache

Change-Id: I348d82f14e0cfba2b18a81a9f54c6cb06b586797
Signed-off-by: Matthew Barth <msbarth@us.ibm.com>

1 files changed, 19 insertions, 0 deletions

diff --git a/control/handlers.hpp b/control/handlers.hpp
index 96cfa2f..ef5d5d8 100644
--- a/control/handlers.hpp
+++ b/control/handlers.hpp
@@ -49,6 +49,25 @@ auto setService(Group&& group)
     };
 }
 
+/**
+ * @brief A handler function to remove an interface from an object path
+ * @details Removes an interface from an object's path which includes removing
+ * all properties that would be under that interface
+ *
+ * @param[in] path - Object's path name
+ * @param[in] interface - Object's interface name
+ *
+ * @return Lambda function
+ *     A lambda function to remove the interface
+ */
+auto removeInterface(const char* path, const char* interface)
+{
+    return[=](auto& zone)
+    {
+        zone.removeObjIntf(path, interface);
+    };
+}
+
 } // namespace handler
 } // namespace control
 } // namespace fan