Remove Observatory build rules and remaining references from the engine (#169945)

Work towards https://github.com/dart-lang/sdk/issues/50233

FYI @a-siva

engine/src/flutter/runtime/BUILD.gn

@@ -118,12 +118,6 @@ source_set("runtime") {
     "//flutter/third_party/tonic",
     "//flutter/txt",
   ]
-
-  if (flutter_runtime_mode != "release" && !is_fuchsia) {
-    # Only link in Observatory in non-release modes on non-Fuchsia. Fuchsia
-    # instead puts Observatory into the runner's package.
-    deps += [ "$dart_src/runtime/observatory:embedded_observatory_archive" ]
-  }
 }
 
 if (enable_unittests) {

engine/src/flutter/runtime/dart_vm.cc

@@ -28,23 +28,6 @@
 #include "third_party/tonic/logging/dart_error.h"
 #include "third_party/tonic/typed_data/typed_list.h"
 
-namespace dart {
-namespace observatory {
-
-#if !OS_FUCHSIA && !FLUTTER_RELEASE
-
-// These two symbols are defined in |observatory_archive.cc| which is generated
-// by the |//third_party/dart/runtime/observatory:archive_observatory| rule.
-// Both of these symbols will be part of the data segment and therefore are read
-// only.
-extern unsigned int observatory_assets_archive_len;
-extern const uint8_t* observatory_assets_archive;
-
-#endif  // !OS_FUCHSIA && !FLUTTER_RELEASE
-
-}  // namespace observatory
-}  // namespace dart
-
 namespace flutter {
 
 // Arguments passed to the Dart VM in all configurations.
@@ -158,26 +141,6 @@ bool DartFileModifiedCallback(const char* source_url, int64_t since_ms) {
 
 void ThreadExitCallback() {}
 
-Dart_Handle GetVMServiceAssetsArchiveCallback() {
-#if FLUTTER_RELEASE
-  return nullptr;
-#elif OS_FUCHSIA
-  fml::UniqueFD fd = fml::OpenFile("pkg/data/observatory.tar", false,
-                                   fml::FilePermission::kRead);
-  fml::FileMapping mapping(fd, {fml::FileMapping::Protection::kRead});
-  if (mapping.GetSize() == 0 || mapping.GetMapping() == nullptr) {
-    FML_LOG(ERROR) << "Fail to load Observatory archive";
-    return nullptr;
-  }
-  return tonic::DartConverter<tonic::Uint8List>::ToDart(mapping.GetMapping(),
-                                                        mapping.GetSize());
-#else
-  return tonic::DartConverter<tonic::Uint8List>::ToDart(
-      ::dart::observatory::observatory_assets_archive,
-      ::dart::observatory::observatory_assets_archive_len);
-#endif
-}
-
 static const char kStdoutStreamId[] = "Stdout";
 static const char kStderrStreamId[] = "Stderr";
 
@@ -472,7 +435,6 @@ DartVM::DartVM(const std::shared_ptr<const DartVMData>& vm_data,
     params.file_write = dart::bin::WriteFile;
     params.file_close = dart::bin::CloseFile;
     params.entropy_source = dart::bin::GetEntropy;
-    params.get_service_assets = GetVMServiceAssetsArchiveCallback;
     DartVMInitializer::Initialize(&params,
                                   settings_.enable_timeline_event_handler,
                                   settings_.trace_systrace);

engine/src/flutter/shell/platform/fuchsia/dart_runner/BUILD.gn

@@ -169,10 +169,6 @@ template("aot_runner_package") {
       deps += [
         "vmservice:vmservice_snapshot",
         "//flutter/shell/platform/fuchsia/runtime/dart/profiler_symbols:dart_aot_runner",
-
-        # TODO(kaushikiska): Figure out how to get the profiler symbols for `libdart_aotruntime`
-        # "$dart_src/runtime:libdart_aotruntime",
-        observatory_target,
       ]
     }
 
@@ -195,10 +191,6 @@ template("aot_runner_package") {
           path = vmservice_snapshot
           dest = "vmservice_snapshot.so"
         },
-        {
-          path = rebase_path(observatory_archive_file)
-          dest = "observatory.tar"
-        },
         {
           path = dart_profiler_symbols
           dest = "dart_aot_runner.dartprofilersymbols"
@@ -222,10 +214,7 @@ template("jit_runner_package") {
     ]
 
     if (!invoker.product) {
-      deps += [
-        "//flutter/shell/platform/fuchsia/runtime/dart/profiler_symbols:dart_jit_runner",
-        observatory_target,
-      ]
+      deps += [ "//flutter/shell/platform/fuchsia/runtime/dart/profiler_symbols:dart_jit_runner" ]
     }
 
     binary = "dart_jit${product_suffix}_runner"
@@ -247,10 +236,6 @@ template("jit_runner_package") {
 
     if (!invoker.product) {
       resources += [
-        {
-          path = rebase_path(observatory_archive_file)
-          dest = "observatory.tar"
-        },
         {
           path = rebase_path(
                   get_label_info(

engine/src/flutter/shell/platform/fuchsia/dart_runner/dart_runner.cc

@@ -228,9 +228,6 @@ DartRunner::DartRunner(sys::ComponentContext* context) : context_(context) {
   params.shutdown_isolate = IsolateShutdownCallback;
   params.cleanup_group = IsolateGroupCleanupCallback;
   params.entropy_source = EntropySource;
-#if !defined(DART_PRODUCT)
-  params.get_service_assets = GetVMServiceAssetsArchiveCallback;
-#endif
   error = Dart_Initialize(&params);
   if (error)
     FML_LOG(FATAL) << "Dart_Initialize failed: " << error;

engine/src/flutter/shell/platform/fuchsia/dart_runner/service_isolate.cc

@@ -197,18 +197,4 @@ Dart_Isolate CreateServiceIsolate(
   return isolate;
 }  // namespace dart_runner
 
-Dart_Handle GetVMServiceAssetsArchiveCallback() {
-  dart_utils::MappedResource vm_service_tar;
-  if (!dart_utils::MappedResource::LoadFromNamespace(
-          nullptr, "/pkg/data/observatory.tar", vm_service_tar)) {
-    FML_LOG(ERROR) << "Failed to load Observatory assets";
-    return nullptr;
-  }
-  // TODO(rmacnak): Should we avoid copying the tar? Or does the service
-  // library not hold onto it anyway?
-  return tonic::DartConverter<tonic::Uint8List>::ToDart(
-      reinterpret_cast<const uint8_t*>(vm_service_tar.address()),
-      vm_service_tar.size());
-}
-
 }  // namespace dart_runner

engine/src/flutter/shell/platform/fuchsia/dart_runner/service_isolate.h

@@ -13,8 +13,6 @@ Dart_Isolate CreateServiceIsolate(const char* uri,
                                   Dart_IsolateFlags* flags,
                                   char** error);
 
-Dart_Handle GetVMServiceAssetsArchiveCallback();
-
 }  // namespace dart_runner
 
 #endif  // FLUTTER_SHELL_PLATFORM_FUCHSIA_DART_RUNNER_SERVICE_ISOLATE_H_

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

@@ -312,10 +312,7 @@ template("jit_runner") {
     ]
 
     if (!product) {
-      deps += [
-        "//flutter/shell/platform/fuchsia/runtime/dart/profiler_symbols:flutter_jit_runner",
-        observatory_target,
-      ]
+      deps += [ "//flutter/shell/platform/fuchsia/runtime/dart/profiler_symbols:flutter_jit_runner" ]
     }
 
     binary = "flutter_jit${product_suffix}_runner"
@@ -329,10 +326,6 @@ template("jit_runner") {
 
     if (!product) {
       resources += [
-        {
-          path = rebase_path(observatory_archive_file)
-          dest = "observatory.tar"
-        },
         {
           path = rebase_path(
                   get_label_info(
@@ -381,10 +374,7 @@ template("aot_runner") {
     deps = [ ":aot${product_suffix}" ]
 
     if (!product) {
-      deps += [
-        "//flutter/shell/platform/fuchsia/runtime/dart/profiler_symbols:flutter_aot_runner",
-        observatory_target,
-      ]
+      deps += [ "//flutter/shell/platform/fuchsia/runtime/dart/profiler_symbols:flutter_aot_runner" ]
     }
 
     binary = "flutter_aot${product_suffix}_runner"
@@ -398,10 +388,6 @@ template("aot_runner") {
 
     if (!product) {
       resources += [
-        {
-          path = rebase_path(observatory_archive_file)
-          dest = "observatory.tar"
-        },
         {
           path = rebase_path(
                   get_label_info(

engine/src/flutter/testing/dart/BUILD.gn

@@ -72,7 +72,7 @@ foreach(test, tests) {
 
 group("dart") {
   testonly = true
-  deps = [ "//flutter/testing/dart/observatory" ]
+  deps = [ "//flutter/testing/dart/vm_service" ]
   foreach(test, tests) {
     deps += [ ":compile_$test" ]
   }

engine/src/flutter/testing/dart/vm_service/BUILD.gn

@@ -18,7 +18,7 @@ foreach(test, tests) {
   }
 }
 
-group("observatory") {
+group("vm_service") {
   testonly = true
   deps = []
   foreach(test, tests) {

engine/src/flutter/tools/fuchsia/dart.gni

@@ -8,9 +8,3 @@ gen_snapshot = "$dart_src/runtime/bin:gen_snapshot"
 gen_snapshot_product = "$dart_src/runtime/bin:gen_snapshot_product"
 
 prebuilt_dart = "$dart_src/tools/sdks/dart-sdk/bin/dart"
-
-observatory_target = "$dart_src/runtime/observatory:observatory_archive"
-observatory_archive_dir = get_label_info(observatory_target, "target_gen_dir")
-observatory_archive_name = get_label_info(observatory_target, "name")
-observatory_archive_file =
-    "${observatory_archive_dir}/${observatory_archive_name}.tar"