Implement reporting InteractionEntry live metrics to runtime

packages/react-native/Package.swift

@@ -13,7 +13,7 @@ import PackageDescription
  To build React Native, you need to follow these steps:
  1. inside the `react-native` root folder, run `yarn install`
  2. `cd packages/react-native`
- 3. `RN_DEP_VERSION=nightly HERMES_VERSION=nightly node scripts/prebuild-ios`
+ 3. `RN_DEP_VERSION=nightly HERMES_VERSION=nightly node scripts/ios-prebuild`
  4. `open Package.swift`
  5. Build in Xcode.
 
@@ -208,6 +208,14 @@ let reactHermes = RNTarget(
   ]
 )
 
+/// React-performancecdpmetrics.podspec
+let reactPerformanceCdpMetrics = RNTarget(
+  name: .reactPerformanceCdpMetrics,
+  path: "ReactCommon/react/performance/cdpmetrics",
+  excludedPaths: ["tests"],
+  dependencies: [.reactNativeDependencies, .reactCxxReact, .jsi, .reactPerformanceTimeline, .reactRuntimeExecutor]
+)
+
 /// React-performancetimeline.podspec
 let reactPerformanceTimeline = RNTarget(
   name: .reactPerformanceTimeline,
@@ -554,6 +562,7 @@ let targets = [
   reactNativeDependencies,
   hermesPrebuilt,
   reactJsiTooling,
+  reactPerformanceCdpMetrics,
   reactPerformanceTimeline,
   reactRuntimeScheduler,
   rctTypesafety,
@@ -724,6 +733,7 @@ extension String {
   static let hermesPrebuilt = "hermes-prebuilt"
 
   static let reactJsiTooling = "React-jsitooling"
+  static let reactPerformanceCdpMetrics = "React-performancecdpmetrics"
   static let reactPerformanceTimeline = "React-performancetimeline"
   static let reactRuntimeScheduler = "React-runtimescheduler"
   static let rctTypesafety = "RCTTypesafety"

packages/react-native/ReactAndroid/src/main/jni/CMakeLists.txt

@@ -81,6 +81,7 @@ add_react_common_subdir(hermes/inspector-modern)
 add_react_common_subdir(react/renderer/runtimescheduler)
 add_react_common_subdir(react/debug)
 add_react_common_subdir(react/featureflags)
+add_react_common_subdir(react/performance/cdpmetrics)
 add_react_common_subdir(react/performance/timeline)
 add_react_common_subdir(react/renderer/animations)
 add_react_common_subdir(react/renderer/attributedstring)
@@ -191,6 +192,7 @@ add_library(reactnative
           $<TARGET_OBJECTS:react_nativemodule_idlecallbacks>
           $<TARGET_OBJECTS:react_nativemodule_microtasks>
           $<TARGET_OBJECTS:react_newarchdefaults>
+          $<TARGET_OBJECTS:react_performance_cdpmetrics>
           $<TARGET_OBJECTS:react_performance_timeline>
           $<TARGET_OBJECTS:react_renderer_animations>
           $<TARGET_OBJECTS:react_renderer_attributedstring>
@@ -279,6 +281,7 @@ target_include_directories(reactnative
         $<TARGET_PROPERTY:react_nativemodule_idlecallbacks,INTERFACE_INCLUDE_DIRECTORIES>
         $<TARGET_PROPERTY:react_nativemodule_microtasks,INTERFACE_INCLUDE_DIRECTORIES>
         $<TARGET_PROPERTY:react_newarchdefaults,INTERFACE_INCLUDE_DIRECTORIES>
+        $<TARGET_PROPERTY:react_performance_cdpmetrics,INTERFACE_INCLUDE_DIRECTORIES>
         $<TARGET_PROPERTY:react_performance_timeline,INTERFACE_INCLUDE_DIRECTORIES>
         $<TARGET_PROPERTY:react_renderer_animations,INTERFACE_INCLUDE_DIRECTORIES>
         $<TARGET_PROPERTY:react_renderer_attributedstring,INTERFACE_INCLUDE_DIRECTORIES>

packages/react-native/ReactCommon/React-Fabric.podspec

@@ -149,6 +149,7 @@ Pod::Spec.new do |s|
     ss.source_files         = podspec_sources("react/renderer/scheduler/**/*.{m,mm,cpp,h}", "react/renderer/scheduler/**/*.h")
     ss.header_dir           = "react/renderer/scheduler"
 
+    ss.dependency             "React-performancecdpmetrics"
     ss.dependency             "React-performancetimeline"
     ss.dependency             "React-Fabric/observers/events"
   end

packages/react-native/ReactCommon/react/performance/cdpmetrics/CMakeLists.txt

@@ -0,0 +1,23 @@
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+#
+# This source code is licensed under the MIT license found in the
+# LICENSE file in the root directory of this source tree.
+
+cmake_minimum_required(VERSION 3.13)
+set(CMAKE_VERBOSE_MAKEFILE on)
+
+include(${REACT_COMMON_DIR}/cmake-utils/react-native-flags.cmake)
+
+file(GLOB react_performance_cdpmetrics_SRC CONFIGURE_DEPENDS *.cpp)
+add_library(react_performance_cdpmetrics OBJECT ${react_performance_cdpmetrics_SRC})
+
+target_compile_reactnative_options(react_performance_cdpmetrics PRIVATE)
+target_compile_options(react_performance_cdpmetrics PRIVATE -Wpedantic)
+
+target_include_directories(react_performance_cdpmetrics PUBLIC ${REACT_COMMON_DIR})
+target_link_libraries(react_performance_cdpmetrics
+        folly_runtime
+        jsi
+        react_performancetimeline
+        react_timing
+        runtimeexecutor)

packages/react-native/ReactCommon/react/performance/cdpmetrics/CdpMetricsReporter.cpp

@@ -0,0 +1,49 @@
+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+#include "CdpMetricsReporter.h"
+
+#include <folly/dynamic.h>
+#include <folly/json.h>
+#include <string_view>
+
+namespace facebook::react {
+
+namespace {
+
+constexpr std::string_view metricsReporterName =
+    "__chromium_devtools_metrics_reporter";
+
+} // namespace
+
+CdpMetricsReporter::CdpMetricsReporter(RuntimeExecutor runtimeExecutor)
+    : runtimeExecutor_(std::move(runtimeExecutor)) {}
+
+void CdpMetricsReporter::onEventTimingEntry(
+    const PerformanceEventTiming& entry) {
+  runtimeExecutor_([entry = std::move(entry)](jsi::Runtime& runtime) {
+    auto global = runtime.global();
+    if (!global.hasProperty(runtime, metricsReporterName.data())) {
+      return;
+    }
+
+    folly::dynamic jsonPayload = folly::dynamic::object;
+    jsonPayload["eventName"] = entry.name;
+    jsonPayload["durationMs"] =
+        static_cast<int>(entry.duration.toDOMHighResTimeStamp());
+    jsonPayload["startTime"] =
+        static_cast<int>(entry.startTime.toDOMHighResTimeStamp());
+    auto jsonString = folly::toJson(jsonPayload);
+    auto jsiString = jsi::String::createFromUtf8(runtime, jsonString);
+
+    auto metricsReporter =
+        global.getPropertyAsFunction(runtime, metricsReporterName.data());
+    metricsReporter.call(runtime, jsiString);
+  });
+}
+
+} // namespace facebook::react

packages/react-native/ReactCommon/react/performance/cdpmetrics/CdpMetricsReporter.h

@@ -0,0 +1,36 @@
+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+#pragma once
+
+#include <ReactCommon/RuntimeExecutor.h>
+#include <jsi/jsi.h>
+#include <react/performance/timeline/PerformanceEntry.h>
+#include <react/performance/timeline/PerformanceEntryReporterListeners.h>
+#include <react/timing/primitives.h>
+
+namespace facebook::react {
+
+/**
+ * [Experimental] Reports CDP interaction events via the
+ * "__chromium_devtools_metrics_reporter" runtime binding.
+ *
+ * This populates the Interaction to Next Paint (INP) live metric in Chrome
+ * DevTools and the V2 Perf Monitor. Events are reported immediately and do
+ * not require an active CDP Tracing session.
+ */
+class CdpMetricsReporter : public PerformanceEntryReporterEventTimingListener {
+ public:
+  explicit CdpMetricsReporter(RuntimeExecutor runtimeExecutor);
+
+  void onEventTimingEntry(const PerformanceEventTiming& entry) override;
+
+ private:
+  const RuntimeExecutor runtimeExecutor_{};
+};
+
+} // namespace facebook::react

packages/react-native/ReactCommon/react/performance/cdpmetrics/React-performancecdpmetrics.podspec

@@ -0,0 +1,53 @@
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+#
+# This source code is licensed under the MIT license found in the
+# LICENSE file in the root directory of this source tree.
+
+require "json"
+
+package = JSON.parse(File.read(File.join(__dir__, "..", "..", "..", "..", "package.json")))
+version = package['version']
+
+source = { :git => 'https://github.com/facebook/react-native.git' }
+if version == '1000.0.0'
+  # This is an unpublished version, use the latest commit hash of the react-native repo, which we’re presumably in.
+  source[:commit] = `git rev-parse HEAD`.strip if system("git rev-parse --git-dir > /dev/null 2>&1")
+else
+  source[:tag] = "v#{version}"
+end
+
+header_search_paths = []
+
+if ENV['USE_FRAMEWORKS']
+  header_search_paths << "\"$(PODS_TARGET_SRCROOT)/../../..\"" # this is needed to allow the cdpmetrics access its own files
+end
+
+Pod::Spec.new do |s|
+  s.name                   = "React-performancecdpmetrics"
+  s.version                = version
+  s.summary                = "Module for reporting React Native performance live metrics to the debugger"
+  s.homepage               = "https://reactnative.dev/"
+  s.license                = package["license"]
+  s.author                 = "Meta Platforms, Inc. and its affiliates"
+  s.platforms              = min_supported_versions
+  s.source                 = source
+  s.source_files           = podspec_sources("**/*.{cpp,h}", "**/*.h")
+  s.header_dir             = "react/performance/cdpmetrics"
+  s.exclude_files          = "tests"
+  s.pod_target_xcconfig    = {
+    "CLANG_CXX_LANGUAGE_STANDARD" => rct_cxx_language_standard(),
+    "HEADER_SEARCH_PATHS" => header_search_paths.join(' ')}
+
+  if ENV['USE_FRAMEWORKS'] && ReactNativeCoreUtils.build_rncore_from_source()
+    s.module_name            = "React_performancecdpmetrics"
+    s.header_mappings_dir  = "../../.."
+  end
+
+  add_dependency(s, "React-runtimeexecutor", :additional_framework_paths => ["platform/ios"])
+  s.dependency "React-jsi"
+  s.dependency "React-performancetimeline"
+  s.dependency "React-timing"
+
+  add_rn_third_party_dependencies(s)
+  add_rncore_dependency(s)
+end

packages/react-native/ReactCommon/react/performance/timeline/PerformanceEntryReporter.cpp

@@ -92,6 +92,21 @@ HighResTimeStamp PerformanceEntryReporter::getCurrentTimeStamp() const {
   return timeStampProvider_ != nullptr ? timeStampProvider_()
                                        : HighResTimeStamp::now();
 }
+void PerformanceEntryReporter::addEventTimingListener(
+    PerformanceEntryReporterEventTimingListener* listener) {
+  std::unique_lock lock(listenersMutex_);
+  eventTimingListeners_.push_back(listener);
+}
+
+void PerformanceEntryReporter::removeEventTimingListener(
+    PerformanceEntryReporterEventTimingListener* listener) {
+  std::unique_lock lock(listenersMutex_);
+  auto it = std::find(
+      eventTimingListeners_.begin(), eventTimingListeners_.end(), listener);
+  if (it != eventTimingListeners_.end()) {
+    eventTimingListeners_.erase(it);
+  }
+}
 
 std::vector<PerformanceEntryType>
 PerformanceEntryReporter::getSupportedEntryTypes() {
@@ -231,7 +246,7 @@ std::optional<HighResTimeStamp> PerformanceEntryReporter::getMarkTime(
 }
 
 void PerformanceEntryReporter::reportEvent(
-    std::string name,
+    const std::string& name,
     HighResTimeStamp startTime,
     HighResDuration duration,
     HighResTimeStamp processingStart,
@@ -246,7 +261,7 @@ void PerformanceEntryReporter::reportEvent(
   }
 
   const auto entry = PerformanceEventTiming{
-      {.name = std::move(name), .startTime = startTime, .duration = duration},
+      {.name = name, .startTime = startTime, .duration = duration},
       processingStart,
       processingEnd,
       interactionId};
@@ -258,6 +273,16 @@ void PerformanceEntryReporter::reportEvent(
 
   // TODO(T198982346): Log interaction events to jsinspector_modern
   observerRegistry_->queuePerformanceEntry(entry);
+
+  std::vector<PerformanceEntryReporterEventTimingListener*> listenersCopy;
+  {
+    std::shared_lock lock(listenersMutex_);
+    listenersCopy = eventTimingListeners_;
+  }
+
+  for (auto* listener : listenersCopy) {
+    listener->onEventTimingEntry(entry);
+  }
 }
 
 void PerformanceEntryReporter::reportLongTask(

packages/react-native/ReactCommon/react/performance/timeline/PerformanceEntryReporter.h

@@ -9,6 +9,7 @@
 
 #include "PerformanceEntryCircularBuffer.h"
 #include "PerformanceEntryKeyedBuffer.h"
+#include "PerformanceEntryReporterListeners.h"
 #include "PerformanceObserverRegistry.h"
 
 #include <folly/dynamic.h>
@@ -73,6 +74,11 @@ class PerformanceEntryReporter {
     timeStampProvider_ = std::move(provider);
   }
 
+  void addEventTimingListener(
+      PerformanceEntryReporterEventTimingListener* listener);
+  void removeEventTimingListener(
+      PerformanceEntryReporterEventTimingListener* listener);
+
   static std::vector<PerformanceEntryType> getSupportedEntryTypes();
 
   uint32_t getDroppedEntriesCount(PerformanceEntryType type) const noexcept;
@@ -100,7 +106,7 @@ class PerformanceEntryReporter {
       UserTimingDetailProvider&& detailProvider = nullptr);
 
   void reportEvent(
-      std::string name,
+      const std::string& name,
       HighResTimeStamp startTime,
       HighResDuration duration,
       HighResTimeStamp processingStart,
@@ -133,6 +139,9 @@ class PerformanceEntryReporter {
   std::unordered_map<std::string, uint32_t> eventCounts_;
 
   std::function<HighResTimeStamp()> timeStampProvider_ = nullptr;
+  mutable std::shared_mutex listenersMutex_;
+  std::vector<PerformanceEntryReporterEventTimingListener*>
+      eventTimingListeners_{};
 
   const inline PerformanceEntryBuffer& getBuffer(
       PerformanceEntryType entryType) const {

packages/react-native/ReactCommon/react/performance/timeline/PerformanceEntryReporterListeners.h

@@ -0,0 +1,24 @@
+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+#pragma once
+
+#include "PerformanceEntry.h"
+
+#include <folly/dynamic.h>
+#include <react/timing/primitives.h>
+
+namespace facebook::react {
+
+class PerformanceEntryReporterEventTimingListener {
+ public:
+  virtual ~PerformanceEntryReporterEventTimingListener() = default;
+
+  virtual void onEventTimingEntry(const PerformanceEventTiming& entry) = 0;
+};
+
+} // namespace facebook::react

packages/react-native/ReactCommon/react/renderer/scheduler/CMakeLists.txt

@@ -19,6 +19,7 @@ target_link_libraries(react_renderer_scheduler
         jsi
         react_debug
         react_featureflags
+        react_performance_cdpmetrics
         react_performance_timeline
         react_renderer_componentregistry
         react_renderer_core

packages/react-native/ReactCommon/react/renderer/scheduler/Scheduler.cpp

@@ -38,6 +38,12 @@ Scheduler::Scheduler(
   auto performanceEntryReporter = PerformanceEntryReporter::getInstance();
   performanceEntryReporter_ = performanceEntryReporter;
 
+  if (ReactNativeFeatureFlags::enableBridgelessArchitecture() &&
+      ReactNativeFeatureFlags::cdpInteractionMetricsEnabled()) {
+    cdpMetricsReporter_.emplace(CdpMetricsReporter{runtimeExecutor_});
+    performanceEntryReporter_->addEventTimingListener(&*cdpMetricsReporter_);
+  }
+
   eventPerformanceLogger_ =
       std::make_shared<EventPerformanceLogger>(performanceEntryReporter_);
 
@@ -164,6 +170,10 @@ Scheduler::~Scheduler() {
   uiManager_->setDelegate(nullptr);
   uiManager_->setAnimationDelegate(nullptr);
 
+  if (cdpMetricsReporter_) {
+    performanceEntryReporter_->removeEventTimingListener(&*cdpMetricsReporter_);
+  }
+
   // Then, let's verify that the requirement was satisfied.
   auto surfaceIds = std::vector<SurfaceId>{};
   uiManager_->getShadowTreeRegistry().enumerate(