[ICD-server] Replace the event/queue based logic with a notifier (#29546

)

* Replace ICDEventManager and its event queue logic by the ICDNotifier  (Subject/observer pattern). Tweak some ICDManager logic to accound for SIT with active interval and active threshold of 0 ms

* Use a pointer array instead of vector for the notifier subscribers

* Restyled by clang-format

* Restyled by gn

* Gate the check for chiplock with CHIP_STACK_LOCK_TRACKING_ENABLED

* Rename a class,functions of the ICDNotifier for clarity. Remove taking the chip stack lock. We will assert if we don't have it (caller responsability). Add briefs and comments. move ICDNotifier implementation to a cpp file

* Restyled by whitespace

* Fix returned error for ICDNotifier subscribe

* Rename ICDSubscriber class to ICDListener, Update comment with Boris's suggestion

---------

Co-authored-by: Restyled.io <commits@restyled.io>

examples/platform/silabs/BaseApplication.cpp

@@ -37,6 +37,7 @@
 #endif // DISPLAY_ENABLED
 
 #include "SilabsDeviceDataProvider.h"
+#include <app/icd/ICDNotifier.h>
 #include <app/server/OnboardingCodesUtil.h>
 #include <app/server/Server.h>
 #include <app/util/attribute-storage.h>
@@ -505,13 +506,12 @@ void BaseApplication::ButtonHandler(AppEvent * aEvent)
             else
             {
                 SILABS_LOG("Network is already provisioned, Ble advertissement not enabled");
-                DeviceLayer::ChipDeviceEvent event;
-                event.Type     = DeviceLayer::DeviceEventType::kAppWakeUpEvent;
-                CHIP_ERROR err = DeviceLayer::PlatformMgr().PostEvent(&event);
-                if (err != CHIP_NO_ERROR)
-                {
-                    ChipLogError(AppServer, "Failed to post App wake up Event event %" CHIP_ERROR_FORMAT, err.Format());
-                }
+#if CHIP_CONFIG_ENABLE_ICD_SERVER
+                // Temporarily claim network activity, until we implement a "user trigger" reason for ICD wakeups.
+                PlatformMgr().LockChipStack();
+                ICDNotifier::GetInstance().BroadcastNetworkActivityNotification();
+                PlatformMgr().UnlockChipStack();
+#endif // CHIP_CONFIG_ENABLE_ICD_SERVER
             }
         }
         else if (mFunctionTimerActive && mFunction == kFunction_FactoryReset)

src/app/BUILD.gn

@@ -59,6 +59,7 @@ buildconfig_header("app_buildconfig") {
     "CHIP_CONFIG_ENABLE_ICD_SERVER=${chip_enable_icd_server}",
     "CHIP_CONFIG_ENABLE_READ_CLIENT=${chip_enable_read_client}",
     "ICD_REPORT_ON_ENTER_ACTIVE_MODE=${chip_report_on_active_mode}",
+    "ICD_MAX_NOTIFICATION_SUBSCRIBERS=${icd_max_notification_subscribers}",
   ]
 }
 
@@ -236,6 +237,7 @@ static_library("app") {
   public_deps = [
     ":app_config",
     "${chip_root}/src/access",
+    "${chip_root}/src/app/icd:notifier",
     "${chip_root}/src/app/icd:observer-srcs",
     "${chip_root}/src/lib/address_resolve",
     "${chip_root}/src/lib/support",
@@ -246,7 +248,7 @@ static_library("app") {
   ]
 
   if (chip_enable_icd_server) {
-    public_deps += [ "${chip_root}/src/app/icd:server-srcs" ]
+    public_deps += [ "${chip_root}/src/app/icd:manager-srcs" ]
   }
 
   cflags = [ "-Wconversion" ]

src/app/FailSafeContext.cpp

@@ -20,6 +20,7 @@
  *          Provides the implementation of the FailSafeContext object.
  */
 
+#include <app/icd/ICDNotifier.h>
 #include <lib/support/SafeInt.h>
 #include <platform/CHIPDeviceConfig.h>
 #include <platform/ConnectivityManager.h>
@@ -55,14 +56,9 @@ void FailSafeContext::SetFailSafeArmed(bool armed)
 #if CHIP_CONFIG_ENABLE_ICD_SERVER
     if (IsFailSafeArmed() != armed)
     {
-        DeviceLayer::ChipDeviceEvent event;
-        event.Type                = DeviceLayer::DeviceEventType::kFailSafeStateChanged;
-        event.FailSafeState.armed = armed;
-        CHIP_ERROR err            = DeviceLayer::PlatformMgr().PostEvent(&event);
-        if (err != CHIP_NO_ERROR)
-        {
-            ChipLogError(AppServer, "Failed to post kFailSafeStateChanged event %" CHIP_ERROR_FORMAT, err.Format());
-        }
+        ICDListener::KeepActiveFlags activeRequest = ICDListener::KeepActiveFlags::kFailSafeArmed;
+        armed ? ICDNotifier::GetInstance().BroadcastActiveRequestNotification(activeRequest)
+              : ICDNotifier::GetInstance().BroadcastActiveRequestWithdrawal(activeRequest);
     }
 #endif
     mFailSafeArmed = armed;

src/app/icd/BUILD.gn

@@ -16,11 +16,20 @@ import("//build_overrides/chip.gni")
 import("icd.gni")
 
 # ICD Server sources and configurations
-
 source_set("observer-srcs") {
   sources = [ "ICDStateObserver.h" ]
 }
 
+source_set("notifier") {
+  sources = [
+    "ICDNotifier.cpp",
+    "ICDNotifier.h",
+  ]
+
+  deps = [ "${chip_root}/src/lib/core" ]
+  public_deps = [ "${chip_root}/src/app:app_config" ]
+}
+
 # ICD Manager source-set is broken out of the main source-set to enable unit tests
 # All sources and configurations used by the ICDManager need to go in this source-set
 source_set("manager-srcs") {
@@ -31,6 +40,7 @@ source_set("manager-srcs") {
 
   public_deps = [
     ":cluster-srcs",
+    ":notifier",
     ":observer-srcs",
     "${chip_root}/src/credentials:credentials",
   ]
@@ -52,16 +62,3 @@ source_set("cluster-srcs") {
     "${chip_root}/src/protocols:im_status",
   ]
 }
-
-# servers-srcs source-set contains all the sources and configurations necessary to build the ICD Server functionality
-# All sources, configurations and dependencies necessary for the ICD Server featureset need to go in this source-set
-#
-# The ICD Server featureset is enabled with the chip_enable_icd_server in the src/app/BUILD.gn file
-source_set("server-srcs") {
-  sources = [
-    "ICDEventManager.cpp",
-    "ICDEventManager.h",
-  ]
-
-  public_deps = [ ":manager-srcs" ]
-}