[Service Manager] Get rid of dynamic service discovery

chrome/app/mash/mash_runner.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/app/mash/mash_runner.h"
 
+#include <string>
+
 #include "base/at_exit.h"
 #include "base/base_paths.h"
 #include "base/base_switches.h"
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/debug/debugger.h"
+#include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/i18n/icu_util.h"
+#include "base/json/json_reader.h"
 #include "base/logging.h"
 #include "base/memory/ptr_util.h"
 #include "base/message_loop/message_loop.h"
 #include "base/path_service.h"
 #include "base/process/launch.h"
 #include "base/process/process.h"
 #include "base/run_loop.h"
 #include "base/sys_info.h"
 #include "base/task_scheduler/task_scheduler.h"
 #include "base/threading/sequenced_worker_pool.h"
+#include "base/threading/thread.h"
 #include "base/trace_event/trace_event.h"
 #include "components/tracing/common/trace_to_console.h"
 #include "components/tracing/common/tracing_switches.h"
 #include "content/public/common/content_switches.h"
 #include "content/public/common/service_names.mojom.h"
 #include "mash/package/mash_packaged_service.h"
 #include "mash/session/public/interfaces/constants.mojom.h"
+#include "mojo/edk/embedder/embedder.h"
+#include "mojo/edk/embedder/scoped_ipc_support.h"
 #include "mojo/public/cpp/bindings/binding_set.h"
 #include "services/catalog/public/interfaces/catalog.mojom.h"
 #include "services/catalog/public/interfaces/constants.mojom.h"
 #include "services/service_manager/background/background_service_manager.h"
 #include "services/service_manager/public/cpp/connector.h"
 #include "services/service_manager/public/cpp/identity.h"
 #include "services/service_manager/public/cpp/service.h"
 #include "services/service_manager/public/cpp/service_context.h"
 #include "services/service_manager/public/cpp/standalone_service/standalone_service.h"
 #include "services/service_manager/public/interfaces/service_factory.mojom.h"
@@ skipping 12 matching lines @@
 
 using service_manager::mojom::ServiceFactory;
 
 namespace {
 
 // kProcessType used to identify child processes.
 const char* kMashChild = "mash-child";
 
 const char kChromeMashServiceName[] = "chrome_mash";
 
-const char kChromeContentBrowserPackageName[] = "chrome_content_browser";
-const char kChromeContentGpuPackageName[] = "chrome_content_gpu";
-const char kChromeContentRendererPackageName[] = "chrome_content_renderer";
-const char kChromeContentUtilityPackageName[] = "chrome_content_utility";
-
-const char kPackagesPath[] = "Packages";
-const char kManifestFilename[] = "manifest.json";
-
-base::FilePath GetPackageManifestPath(const std::string& package_name) {
-  base::FilePath exe = base::CommandLine::ForCurrentProcess()->GetProgram();
-  return exe.DirName().AppendASCII(kPackagesPath).AppendASCII(package_name)
-      .AppendASCII(kManifestFilename);
-}
+const base::FilePath::CharType kChromeMashCatalogFilename[] =
+    FILE_PATH_LITERAL("chrome_mash_catalog.json");
 
 bool IsChild() {
   return base::CommandLine::ForCurrentProcess()->HasSwitch(
              switches::kProcessType) &&
          base::CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
              switches::kProcessType) == kMashChild;
 }
 
 void InitializeResources() {
   ui::RegisterPathProvider();
@@ skipping 78 matching lines @@
 
   if (IsChild())
     return RunChild();
   RunMain();
   return 0;
 }
 
 void MashRunner::RunMain() {
   base::SequencedWorkerPool::EnableWithRedirectionToTaskSchedulerForProcess();
 
+  mojo::edk::Init();
+
+  base::Thread ipc_thread("IPC thread");
+  ipc_thread.StartWithOptions(
+      base::Thread::Options(base::MessageLoop::TYPE_IO, 0));
+  mojo::edk::ScopedIPCSupport ipc_support(
+      ipc_thread.task_runner(),
+      mojo::edk::ScopedIPCSupport::ShutdownPolicy::FAST);
+
+  std::string catalog_contents;
+  base::FilePath exe_path;
+  base::PathService::Get(base::DIR_EXE, &exe_path);
+  base::FilePath catalog_path = exe_path.Append(kChromeMashCatalogFilename);
+  DCHECK(base::ReadFileToString(catalog_path, &catalog_contents));
+  std::unique_ptr<base::Value> manifest_value =
+      base::JSONReader::Read(catalog_contents);
+  DCHECK(manifest_value);
+
   // TODO(sky): refactor BackgroundServiceManager so can supply own context, we
   // shouldn't we using context as it has a lot of stuff we don't really want
   // in chrome.
   ServiceProcessLauncherDelegateImpl service_process_launcher_delegate;
-  service_manager::BackgroundServiceManager background_service_manager;
-  std::unique_ptr<service_manager::BackgroundServiceManager::InitParams>
-      init_params(new service_manager::BackgroundServiceManager::InitParams);
-  init_params->service_process_launcher_delegate =
-      &service_process_launcher_delegate;
-  background_service_manager.Init(std::move(init_params));
+  service_manager::BackgroundServiceManager background_service_manager(
+      &service_process_launcher_delegate, std::move(manifest_value));
+  service_manager::mojom::ServicePtr service;
   context_.reset(new service_manager::ServiceContext(
       base::MakeUnique<mash::MashPackagedService>(),
-      background_service_manager.CreateServiceRequest(kChromeMashServiceName)));
-
-  // We need to send a sync messages to the Catalog, so we wait for a completed
-  // connection first.
-  std::unique_ptr<service_manager::Connection> catalog_connection =
-      context_->connector()->Connect(catalog::mojom::kServiceName);
-  {
-    base::RunLoop run_loop;
-    catalog_connection->AddConnectionCompletedClosure(run_loop.QuitClosure());
-    run_loop.Run();
-  }
-
-  // Synchronously override manifests needed for content process services.
-  catalog::mojom::CatalogControlPtr catalog_control;
-  catalog_connection->GetInterface(&catalog_control);
-  CHECK(catalog_control->OverrideManifestPath(
-      content::mojom::kBrowserServiceName,
-      GetPackageManifestPath(kChromeContentBrowserPackageName)));
-  CHECK(catalog_control->OverrideManifestPath(
-      content::mojom::kGpuServiceName,
-      GetPackageManifestPath(kChromeContentGpuPackageName)));
-  CHECK(catalog_control->OverrideManifestPath(
-      content::mojom::kRendererServiceName,
-      GetPackageManifestPath(kChromeContentRendererPackageName)));
-  CHECK(catalog_control->OverrideManifestPath(
-      content::mojom::kUtilityServiceName,
-      GetPackageManifestPath(kChromeContentUtilityPackageName)));
+      service_manager::mojom::ServiceRequest(&service)));
+  background_service_manager.RegisterService(
+      service_manager::Identity(
+          kChromeMashServiceName, service_manager::mojom::kRootUserID),
+      std::move(service), nullptr);
 
   // Ping mash_session to ensure an instance is brought up
   context_->connector()->Connect(mash::session::mojom::kServiceName);
   base::RunLoop().Run();
 
   base::TaskScheduler::GetInstance()->Shutdown();
 }
 
 int MashRunner::RunChild() {
   service_manager::WaitForDebuggerIfNecessary();
@@ skipping 70 matching lines @@
       command_line->GetSwitchValueASCII(switches::kWaitForDebugger)) {
     return;
   }
 
   // Include the pid as logging may not have been initialized yet (the pid
   // printed out by logging is wrong).
   LOG(WARNING) << "waiting for debugger to attach for service " << service_name
                << " pid=" << base::Process::Current().Pid();
   base::debug::WaitForDebugger(120, true);
 }