Add src/app/MatterCallbacks.h for allowing applications to know what …

…is happening onto the stack (#10500)

src/app/CommandHandler.cpp

@@ -28,6 +28,7 @@
 #include "InteractionModelEngine.h"
 #include "messaging/ExchangeContext.h"
 
+#include <app/util/MatterCallbacks.h>
 #include <lib/support/TypeTraits.h>
 #include <protocols/secure_channel/Constants.h>
 
@@ -186,7 +187,10 @@ CHIP_ERROR CommandHandler::ProcessCommandDataIB(CommandDataIB::Parser & aCommand
         ChipLogDetail(DataManagement,
                       "Received command for Endpoint=%" PRIu16 " Cluster=" ChipLogFormatMEI " Command=" ChipLogFormatMEI,
                       endpointId, ChipLogValueMEI(clusterId), ChipLogValueMEI(commandId));
-        DispatchSingleClusterCommand(ConcreteCommandPath(endpointId, clusterId, commandId), commandDataReader, this);
+        const ConcreteCommandPath concretePath(endpointId, clusterId, commandId);
+        SuccessOrExit(MatterPreCommandReceivedCallback(concretePath));
+        DispatchSingleClusterCommand(concretePath, commandDataReader, this);
+        MatterPostCommandReceivedCallback(concretePath);
     }
 
 exit:
@@ -341,3 +345,9 @@ TLV::TLVWriter * CommandHandler::GetCommandDataIBTLVWriter()
 
 } // namespace app
 } // namespace chip
+
+CHIP_ERROR __attribute__((weak)) MatterPreCommandReceivedCallback(const chip::app::ConcreteCommandPath & commandPath)
+{
+    return CHIP_NO_ERROR;
+}
+void __attribute__((weak)) MatterPostCommandReceivedCallback(const chip::app::ConcreteCommandPath & commandPath) {}

src/app/WriteHandler.cpp

@@ -21,6 +21,7 @@
 #include <app/MessageDef/EventPathIB.h>
 #include <app/WriteHandler.h>
 #include <app/reporting/Engine.h>
+#include <app/util/MatterCallbacks.h>
 #include <lib/support/TypeTraits.h>
 
 namespace chip {
@@ -151,7 +152,14 @@ CHIP_ERROR WriteHandler::ProcessAttributeDataList(TLV::TLVReader & aAttributeDat
 
         err = element.GetData(&dataReader);
         SuccessOrExit(err);
-        err = WriteSingleClusterData(clusterInfo, dataReader, this);
+
+        {
+            const ConcreteAttributePath concretePath =
+                ConcreteAttributePath(clusterInfo.mEndpointId, clusterInfo.mClusterId, clusterInfo.mFieldId);
+            MatterPreAttributeWriteCallback(concretePath);
+            err = WriteSingleClusterData(clusterInfo, dataReader, this);
+            MatterPostAttributeWriteCallback(concretePath);
+        }
         SuccessOrExit(err);
     }
 
@@ -286,3 +294,6 @@ void WriteHandler::ClearState()
 
 } // namespace app
 } // namespace chip
+
+void __attribute__((weak)) MatterPreAttributeWriteCallback(const chip::app::ConcreteAttributePath & attributePath) {}
+void __attribute__((weak)) MatterPostAttributeWriteCallback(const chip::app::ConcreteAttributePath & attributePath) {}

src/app/reporting/Engine.cpp

@@ -26,6 +26,7 @@
 #include <app/AppBuildConfig.h>
 #include <app/InteractionModelEngine.h>
 #include <app/reporting/Engine.h>
+#include <app/util/MatterCallbacks.h>
 
 namespace chip {
 namespace app {
@@ -80,7 +81,9 @@ Engine::RetrieveClusterData(FabricIndex aAccessingFabricIndex, AttributeDataList
     ChipLogDetail(DataManagement, "<RE:Run> Cluster %" PRIx32 ", Field %" PRIx32 " is dirty", aClusterInfo.mClusterId,
                   aClusterInfo.mFieldId);
 
+    MatterPreAttributeReadCallback(path);
     err = ReadSingleClusterData(aAccessingFabricIndex, path, attributeDataElementBuilder.GetWriter(), nullptr /* data exists */);
+    MatterPostAttributeReadCallback(path);
     SuccessOrExit(err);
     attributeDataElementBuilder.MoreClusterData(false);
     attributeDataElementBuilder.EndOfAttributeDataElement();
@@ -459,3 +462,6 @@ void Engine::OnReportConfirm()
 }; // namespace reporting
 }; // namespace app
 }; // namespace chip
+
+void __attribute__((weak)) MatterPreAttributeReadCallback(const chip::app::ConcreteAttributePath & attributePath) {}
+void __attribute__((weak)) MatterPostAttributeReadCallback(const chip::app::ConcreteAttributePath & attributePath) {}

src/app/util/MatterCallbacks.h

@@ -0,0 +1,39 @@
+/*
+ *
+ *    Copyright (c) 2021 Project CHIP Authors
+ *
+ *   Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
+ *
+ *    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.
+ */
+
+// THIS FILE IS GENERATED BY ZAP
+
+#pragma once
+
+void MatterPreAttributeReadCallback(const chip::app::ConcreteAttributePath & attributePath);
+void MatterPostAttributeReadCallback(const chip::app::ConcreteAttributePath & attributePath);
+void MatterPreAttributeWriteCallback(const chip::app::ConcreteAttributePath & attributePath);
+void MatterPostAttributeWriteCallback(const chip::app::ConcreteAttributePath & attributePath);
+
+/** @brief Matter Pre Command Received
+ *
+ * This callback is called once the message has been determined to be a command, and
+ * before the command is dispatched to the receiver.
+ */
+CHIP_ERROR MatterPreCommandReceivedCallback(const chip::app::ConcreteCommandPath & commandPath);
+
+/** @brief Matter Post Command Received
+ *
+ * This callback is called once the message has been determined to be a command, but
+ * after it beeing dispatched to the receiver.
+ */
+void MatterPostCommandReceivedCallback(const chip::app::ConcreteCommandPath & commandPath);