Log a message identifying Fusebox based on a handshake with the frontend

packages/react-native/ReactCommon/jsinspector-modern/HostAgent.cpp

@@ -22,14 +22,8 @@ namespace facebook::react::jsinspector_modern {
 
 #define ANSI_WEIGHT_BOLD "\x1B[1m"
 #define ANSI_WEIGHT_RESET "\x1B[22m"
-#define ANSI_STYLE_ITALIC "\x1B[3m"
-#define ANSI_STYLE_RESET "\x1B[23m"
 #define ANSI_COLOR_BG_YELLOW "\x1B[48;2;253;247;231m"
-
-static constexpr auto kModernCDPBackendNotice =
-    ANSI_COLOR_BG_YELLOW ANSI_WEIGHT_BOLD
-    "NOTE:" ANSI_WEIGHT_RESET " You are using the " ANSI_STYLE_ITALIC
-    "modern" ANSI_STYLE_RESET " CDP backend for React Native (HostTarget)."sv;
+#define CSS_STYLE_PLACEHOLDER "%c"
 
 HostAgent::HostAgent(
     FrontendChannel frontendChannel,
@@ -51,12 +45,15 @@ void HostAgent::handleRequest(const cdp::PreparsedRequest& req) {
   if (req.method == "Log.enable") {
     sessionState_.isLogDomainEnabled = true;
 
-    // Send a log entry identifying the modern CDP backend.
-    sendInfoLogEntry(kModernCDPBackendNotice);
+    if (sessionState_.isFuseboxClientDetected) {
+      sendFuseboxNotice();
+    }
 
     // Send a log entry with the integration name.
     if (sessionMetadata_.integrationName) {
-      sendInfoLogEntry("Integration: " + *sessionMetadata_.integrationName);
+      sendInfoLogEntry(
+          ANSI_COLOR_BG_YELLOW "Debugger integration: " +
+          *sessionMetadata_.integrationName);
     }
 
     shouldSendOKResponse = true;
@@ -100,6 +97,15 @@ void HostAgent::handleRequest(const cdp::PreparsedRequest& req) {
             : std::nullopt,
     });
 
+    shouldSendOKResponse = true;
+    isFinishedHandlingRequest = true;
+  } else if (req.method == "FuseboxClient.setClientMetadata") {
+    sessionState_.isFuseboxClientDetected = true;
+
+    if (sessionState_.isLogDomainEnabled) {
+      sendFuseboxNotice();
+    }
+
     shouldSendOKResponse = true;
     isFinishedHandlingRequest = true;
   }
@@ -120,7 +126,23 @@ void HostAgent::handleRequest(const cdp::PreparsedRequest& req) {
       req.method + " not implemented yet"));
 }
 
-void HostAgent::sendInfoLogEntry(std::string_view text) {
+void HostAgent::sendFuseboxNotice() {
+  static constexpr auto kFuseboxNotice = ANSI_COLOR_BG_YELLOW
+      "Welcome to the new React Native debugger (codename " ANSI_WEIGHT_BOLD
+      "React Fusebox " CSS_STYLE_PLACEHOLDER
+      "⚡️" CSS_STYLE_PLACEHOLDER ANSI_WEIGHT_RESET ")."sv;
+
+  sendInfoLogEntry(
+      kFuseboxNotice, {"font-family: sans-serif;", "font-family: monospace;"});
+}
+
+void HostAgent::sendInfoLogEntry(
+    std::string_view text,
+    std::initializer_list<std::string_view> args) {
+  folly::dynamic argsArray = folly::dynamic::array();
+  for (auto arg : args) {
+    argsArray.push_back(arg);
+  }
   frontendChannel_(cdp::jsonNotification(
       "Log.entryAdded",
       folly::dynamic::object(
@@ -130,7 +152,7 @@ void HostAgent::sendInfoLogEntry(std::string_view text) {
               duration_cast<milliseconds>(
                   system_clock::now().time_since_epoch())
                   .count())("source", "other")(
-              "level", "info")("text", text))));
+              "level", "info")("text", text)("args", std::move(argsArray)))));
 }
 
 void HostAgent::setCurrentInstanceAgent(

packages/react-native/ReactCommon/jsinspector-modern/HostAgent.h

@@ -71,7 +71,11 @@ class HostAgent final {
    * Runtime.consoleAPICalled is that the latter requires an execution context
    * ID, which does not exist at the Host level.
    */
-  void sendInfoLogEntry(std::string_view text);
+  void sendInfoLogEntry(
+      std::string_view text,
+      std::initializer_list<std::string_view> args = {});
+
+  void sendFuseboxNotice();
 
   FrontendChannel frontendChannel_;
   HostTargetController& targetController_;

packages/react-native/ReactCommon/jsinspector-modern/SessionState.h

@@ -36,6 +36,8 @@ struct SessionState {
   std::unordered_map<std::string, ExecutionContextSelectorSet>
       subscribedBindings;
 
+  bool isFuseboxClientDetected{false};
+
   /**
    * Stores the state object exported from the last main RuntimeAgent, if any,
    * before it was destroyed.

packages/react-native/ReactCommon/jsinspector-modern/tests/HostTargetTest.cpp

@@ -155,8 +155,7 @@ TEST_F(HostTargetProtocolTest, InjectLogsToIdentifyBackend) {
       onMessage(JsonParsed(AllOf(
           AtJsonPtr("/method", "Log.entryAdded"),
           AtJsonPtr("/params/entry", Not(IsEmpty()))))))
-      .Times(2)
-      .RetiresOnSaturation();
+      .Times(AtLeast(1));
   EXPECT_CALL(fromPage(), onMessage(JsonEq(R"({
                                                "id": 1,
                                                "result": {}

packages/react-native/ReactCommon/jsinspector-modern/tests/JsiIntegrationTest.cpp

@@ -317,6 +317,21 @@ TYPED_TEST(JsiIntegrationPortableTest, ExceptionDuringAddBindingIsIgnored) {
   EXPECT_TRUE(this->eval("globalThis.foo === 42").getBool());
 }
 
+TYPED_TEST(JsiIntegrationPortableTest, FuseboxSetClientMetadata) {
+  this->connect();
+
+  this->expectMessageFromPage(JsonEq(R"({
+                                          "id": 1,
+                                          "result": {}
+                                        })"));
+
+  this->toPage_->sendMessage(R"({
+                                 "id": 1,
+                                 "method": "FuseboxClient.setClientMetadata",
+                                 "params": {}
+                               })");
+}
+
 #pragma endregion // AllEngines
 #pragma region AllHermesVariants