Return an exit code from sky_shell representing what kind of error occurred (flutter/engine#3368)

This is intended to match the exit codes returned by the Dart command line tool

DEPS

@@ -58,7 +58,7 @@ deps = {
    Var('fuchsia_git') + '/ftl' + '@' + 'bb82d5f52ecca65650817a1c31c1f49eca54237a',
 
   'src/lib/tonic':
-   Var('fuchsia_git') + '/tonic' + '@' + '4214b35e02a1286a5fb98895d0c480fa0da10f6d',
+   Var('fuchsia_git') + '/tonic' + '@' + '06659ecdf45787d5dde31b4dbc79a32dae626687',
 
   'src/lib/zip':
    Var('fuchsia_git') + '/zip' + '@' + '92dc87ca645fe8e9f5151ef6dac86d8311a7222f',

engine/src/flutter/runtime/dart_controller.cc

@@ -120,15 +120,18 @@ void DartController::RunFromSnapshot(const uint8_t* buffer, size_t size) {
     exit(1);
 }
 
-void DartController::RunFromSource(const std::string& main,
-                                   const std::string& packages) {
+tonic::DartErrorHandleType DartController::RunFromSource(
+    const std::string& main, const std::string& packages) {
   tonic::DartState::Scope scope(dart_state());
   tonic::FileLoader& loader = dart_state()->file_loader();
   if (!packages.empty() && !loader.LoadPackagesMap(ResolvePath(packages)))
     FTL_LOG(WARNING) << "Failed to load package map: " << packages;
-  LogIfError(loader.LoadScript(main));
+  Dart_Handle result = loader.LoadScript(main);
+  LogIfError(result);
+  tonic::DartErrorHandleType error = tonic::GetErrorHandleType(result);
   if (SendStartMessage(Dart_RootLibrary()))
     exit(1);
+  return error;
 }
 
 void DartController::CreateIsolateFor(const std::string& script_uri,

engine/src/flutter/runtime/dart_controller.h

@@ -9,6 +9,7 @@
 
 #include "dart/runtime/include/dart_api.h"
 #include "lib/ftl/macros.h"
+#include "lib/tonic/logging/dart_error.h"
 
 namespace blink {
 class UIDartState;
@@ -20,7 +21,8 @@ class DartController {
 
   void RunFromPrecompiledSnapshot();
   void RunFromSnapshot(const uint8_t* buffer, size_t size);
-  void RunFromSource(const std::string& main, const std::string& packages);
+  tonic::DartErrorHandleType RunFromSource(const std::string& main,
+                                           const std::string& packages);
 
   void CreateIsolateFor(const std::string& script_uri,
                         std::unique_ptr<UIDartState> ui_dart_state);

engine/src/flutter/runtime/runtime_controller.cc

@@ -10,6 +10,7 @@
 #include "flutter/lib/ui/window/window.h"
 #include "flutter/runtime/dart_controller.h"
 #include "flutter/runtime/runtime_delegate.h"
+#include "lib/tonic/dart_message_handler.h"
 
 using tonic::DartState;
 
@@ -149,4 +150,15 @@ bool RuntimeController::HasLivePorts() {
   return Dart_HasLivePorts();
 }
 
+tonic::DartErrorHandleType RuntimeController::GetLastError() {
+  if (!dart_controller_) {
+    return tonic::kNoError;
+  }
+  UIDartState* dart_state = dart_controller_->dart_state();
+  if (!dart_state) {
+    return tonic::kNoError;
+  }
+  return dart_state->message_handler().isolate_last_error();
+}
+
 }  // namespace blink

engine/src/flutter/runtime/runtime_controller.h

@@ -41,10 +41,9 @@ class RuntimeController : public WindowClient, public IsolateClient {
   void DispatchSemanticsAction(int32_t id, SemanticsAction action);
 
   Dart_Port GetMainPort();
-
   std::string GetIsolateName();
-
   bool HasLivePorts();
+  tonic::DartErrorHandleType GetLastError();
 
  private:
   explicit RuntimeController(RuntimeDelegate* client);

engine/src/flutter/shell/common/engine.cc

@@ -66,6 +66,7 @@ Engine::Engine(PlatformView* platform_view)
           platform_view->rasterizer().GetWeakRasterizerPtr(),
           platform_view->GetVsyncWaiter(),
           this)),
+      load_script_error_(tonic::kNoError),
       activity_running_(false),
       have_surface_(false),
       weak_factory_(this) {}
@@ -127,7 +128,8 @@ void Engine::RunBundleAndSource(const std::string& bundle_path,
   if (!bundle_path.empty())
     ConfigureAssetBundle(bundle_path);
   ConfigureRuntime(GetScriptUriFromPath(main));
-  runtime_->dart_controller()->RunFromSource(main, packages_path);
+  load_script_error_ =
+      runtime_->dart_controller()->RunFromSource(main, packages_path);
 }
 
 void Engine::BeginFrame(ftl::TimePoint frame_time) {
@@ -161,6 +163,16 @@ bool Engine::UIIsolateHasLivePorts() {
   return runtime_->HasLivePorts();
 }
 
+tonic::DartErrorHandleType Engine::GetUIIsolateLastError() {
+  if (!runtime_)
+    return tonic::kNoError;
+  return runtime_->GetLastError();
+}
+
+tonic::DartErrorHandleType Engine::GetLoadScriptError() {
+  return load_script_error_;
+}
+
 void Engine::OnOutputSurfaceCreated(const ftl::Closure& gpu_continuation) {
   blink::Threads::Gpu()->PostTask(gpu_continuation);
   have_surface_ = true;

engine/src/flutter/shell/common/engine.h

@@ -56,10 +56,10 @@ class Engine : public blink::RuntimeDelegate {
                      const std::string& bundle);
 
   Dart_Port GetUIIsolateMainPort();
-
   std::string GetUIIsolateName();
-
   bool UIIsolateHasLivePorts();
+  tonic::DartErrorHandleType GetUIIsolateLastError();
+  tonic::DartErrorHandleType GetLoadScriptError();
 
   void OnOutputSurfaceCreated(const ftl::Closure& gpu_continuation);
   void OnOutputSurfaceDestroyed(const ftl::Closure& gpu_continuation);
@@ -97,6 +97,7 @@ class Engine : public blink::RuntimeDelegate {
   ftl::WeakPtr<PlatformView> platform_view_;
   std::unique_ptr<Animator> animator_;
   std::unique_ptr<blink::RuntimeController> runtime_;
+  tonic::DartErrorHandleType load_script_error_;
   ftl::RefPtr<blink::PlatformMessage> pending_push_route_message_;
   blink::ViewportMetrics viewport_metrics_;
   std::string language_code_;

engine/src/flutter/shell/platform/linux/BUILD.gn

@@ -20,6 +20,7 @@ executable("linux") {
     "//flutter/shell/gpu",
     "//flutter/shell/testing",
     "//lib/ftl",
+    "//lib/tonic",
 
     # Required by FontCacheLinux. Not Skia. Skia uses a custom font manager
     # that delegates to us.

engine/src/flutter/shell/platform/linux/main_linux.cc

@@ -17,32 +17,60 @@
 #include "flutter/shell/testing/test_runner.h"
 #include "flutter/shell/testing/testing.h"
 #include "flutter/sky/engine/public/web/Sky.h"
+#include "lib/tonic/dart_microtask_queue.h"
 
 namespace {
 
+// Exit codes used by the Dart command line tool.
+const int kApiErrorExitCode = 253;
+const int kCompilationErrorExitCode = 254;
+const int kErrorExitCode = 255;
+
 // Checks whether the engine's main Dart isolate has no pending work.  If so,
 // then exit the given message loop.
 class ScriptCompletionTaskObserver : public base::MessageLoop::TaskObserver {
  public:
   ScriptCompletionTaskObserver(base::MessageLoop& main_message_loop)
-      : main_message_loop_(main_message_loop), prev_live_(false) {}
+      : main_message_loop_(main_message_loop),
+        prev_live_(false),
+        last_error_(tonic::kNoError) {}
 
   void WillProcessTask(const base::PendingTask& pending_task) override {}
 
   void DidProcessTask(const base::PendingTask& pending_task) override {
     shell::TestRunner& test_runner = shell::TestRunner::Shared();
     bool live = test_runner.platform_view().engine().UIIsolateHasLivePorts();
-    if (prev_live_ && !live)
+    if (prev_live_ && !live) {
+      last_error_ = test_runner.platform_view().engine().GetUIIsolateLastError();
       main_message_loop_.PostTask(FROM_HERE,
                                   main_message_loop_.QuitWhenIdleClosure());
+    }
     prev_live_ = live;
   }
 
+  tonic::DartErrorHandleType last_error() {
+    return last_error_;
+  }
+
  private:
   base::MessageLoop& main_message_loop_;
   bool prev_live_;
+  tonic::DartErrorHandleType last_error_;
 };
 
+int ConvertErrorTypeToExitCode(tonic::DartErrorHandleType error) {
+  switch (error) {
+    case tonic::kCompilationErrorType:
+      return kCompilationErrorExitCode;
+    case tonic::kApiErrorType:
+      return kApiErrorExitCode;
+    case tonic::kUnknownErrorType:
+      return kErrorExitCode;
+    default:
+      return 0;
+  }
+}
+
 void RunNonInteractive(bool run_forever) {
   base::MessageLoop message_loop;
 
@@ -64,9 +92,16 @@ void RunNonInteractive(bool run_forever) {
 
   message_loop.Run();
 
+  shell::TestRunner& test_runner = shell::TestRunner::Shared();
+  tonic::DartErrorHandleType error = test_runner.platform_view().engine().GetLoadScriptError();
+  if (error == tonic::kNoError)
+    error = task_observer.last_error();
+  if (error == tonic::kNoError)
+    error = tonic::DartMicrotaskQueue::GetLastError();
+
   // The script has completed and the engine may not be in a clean state,
   // so just stop the process.
-  exit(0);
+  exit(ConvertErrorTypeToExitCode(error));
 }
 
 static bool IsDartFile(const std::string& path) {