[Sync] SyncEngine refactor part 2: SyncServiceBase.

components/sync/driver/sync_service_base.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 "components/sync/driver/sync_service_base.h"
+
+#include <utility>
+
+#include "base/bind.h"
+#include "base/bind_helpers.h"
+#include "base/command_line.h"
+#include "base/memory/ptr_util.h"
+#include "base/path_service.h"
+#include "components/invalidation/public/invalidation_service.h"
+#include "components/sync/base/report_unrecoverable_error.h"
+#include "components/sync/device_info/local_device_info_provider.h"
+#include "components/sync/driver/sync_driver_switches.h"
+#include "components/sync/engine/engine_components_factory_impl.h"
+
+namespace syncer {
+
+namespace {
+
+const base::FilePath::CharType kSyncDataFolderName[] =
+    FILE_PATH_LITERAL("Sync Data");
+
+#if defined(OS_WIN)
+const base::FilePath::CharType kLoopbackServerBackendFilename[] =
+    FILE_PATH_LITERAL("profile.pb");
+#endif
+
+EngineComponentsFactory::Switches EngineSwitchesFromCommandLine() {
+  EngineComponentsFactory::Switches factory_switches = {
+      EngineComponentsFactory::ENCRYPTION_KEYSTORE,
+      EngineComponentsFactory::BACKOFF_NORMAL};
+
+  base::CommandLine* cl = base::CommandLine::ForCurrentProcess();
+  if (cl->HasSwitch(switches::kSyncShortInitialRetryOverride)) {
+    factory_switches.backoff_override =
+        EngineComponentsFactory::BACKOFF_SHORT_INITIAL_RETRY_OVERRIDE;
+  }
+  if (cl->HasSwitch(switches::kSyncEnableGetUpdateAvoidance)) {
+    factory_switches.pre_commit_updates_policy =
+        EngineComponentsFactory::FORCE_ENABLE_PRE_COMMIT_UPDATE_AVOIDANCE;
+  }
+  if (cl->HasSwitch(switches::kSyncShortNudgeDelayForTest)) {
+    factory_switches.nudge_delay =
+        EngineComponentsFactory::NudgeDelay::SHORT_NUDGE_DELAY;
+  }
+  return factory_switches;
+}
+
+}  // namespace
+
+SyncServiceBase::SyncServiceBase(std::unique_ptr<SyncClient> sync_client,
+                                 std::unique_ptr<SigninManagerWrapper> signin,
+                                 const version_info::Channel& channel,
+                                 const base::FilePath& base_directory,
+                                 const std::string& debug_identifier)
+    : sync_client_(std::move(sync_client)),
+      signin_(std::move(signin)),
+      channel_(channel),
+      base_directory_(base_directory),
+      directory_path_(
+          base_directory_.Append(base::FilePath(kSyncDataFolderName))),
+      debug_identifier_(debug_identifier),
+      sync_prefs_(sync_client_->GetPrefService()) {}
+
+SyncServiceBase::~SyncServiceBase() = default;
+
+void SyncServiceBase::InitializeEngine() {
+  DCHECK(engine_);
+
+  if (!sync_thread_) {
+    sync_thread_ = base::MakeUnique<base::Thread>("Chrome_SyncThread");
+    base::Thread::Options options;
+    options.timer_slack = base::TIMER_SLACK_MAXIMUM;
+    CHECK(sync_thread_->StartWithOptions(options));
+  }
+
+  SyncEngine::InitParams params;
+  params.sync_task_runner = sync_thread_->task_runner();
+  params.host = this;
+  params.registrar = base::MakeUnique<SyncBackendRegistrar>(
+      debug_identifier_, base::Bind(&SyncClient::CreateModelWorkerForGroup,
+                                    base::Unretained(sync_client_.get())));
+  params.extensions_activity = sync_client_->GetExtensionsActivity();
+  params.event_handler = GetJsEventHandler();
+  params.service_url = sync_service_url();
+  params.sync_user_agent = GetLocalDeviceInfoProvider()->GetSyncUserAgent();
+  params.http_factory_getter = MakeHttpPostProviderFactoryGetter();
+  params.credentials = GetCredentials();
+  invalidation::InvalidationService* invalidator =
+      sync_client_->GetInvalidationService();
+  params.invalidator_client_id =
+      invalidator ? invalidator->GetInvalidatorClientId() : "",
+  params.sync_manager_factory = base::MakeUnique<SyncManagerFactory>();
+  // The first time we start up the engine we want to ensure we have a clean
+  // directory, so delete any old one that might be there.
+  params.delete_sync_data_folder = !IsFirstSetupComplete();
+  params.enable_local_sync_backend =
+      GetLocalSyncConfig(&params.local_sync_backend_folder);
+  params.restored_key_for_bootstrapping =
+      sync_prefs_.GetEncryptionBootstrapToken();
+  params.restored_keystore_key_for_bootstrapping =
+      sync_prefs_.GetKeystoreEncryptionBootstrapToken();
+  params.engine_components_factory =
+      base::MakeUnique<EngineComponentsFactoryImpl>(
+          EngineSwitchesFromCommandLine());
+  params.unrecoverable_error_handler = GetUnrecoverableErrorHandler();
+  params.report_unrecoverable_error_function =
+      base::Bind(ReportUnrecoverableError, channel_);
+  params.saved_nigori_state = MoveSavedNigoriState();
+  sync_prefs_.GetInvalidationVersions(&params.invalidation_versions);
+
+  engine_->Initialize(std::move(params));
+}
+
+bool SyncServiceBase::GetLocalSyncConfig(
+    base::FilePath* local_sync_backend_folder) const {
+  bool enable_local_sync_backend = false;
+  *local_sync_backend_folder = sync_prefs_.GetLocalSyncBackendDir();
+#if defined(OS_WIN)
+  enable_local_sync_backend = sync_prefs_.IsLocalSyncEnabled();
+  if (local_sync_backend_folder->empty()) {
+    // TODO(pastarmovj): Add DIR_ROAMING_USER_DATA to PathService to simplify
+    // this code and move the logic in its right place. See crbug/657810.
+    CHECK(
+        base::PathService::Get(base::DIR_APP_DATA, local_sync_backend_folder));
+    *local_sync_backend_folder = local_sync_backend_folder->Append(
+        FILE_PATH_LITERAL("Chrome/User Data"));
+  }
+  // This code as it is now will assume the same profile order is present on all
+  // machines, which is not a given. It is to be defined if only the Default
+  // profile should get this treatment or all profile as is the case now. The
+  // solution for now will be to assume profiles are created in the same order
+  // on all machines and in the future decide if only the Default one should be
+  // considered roamed.
+  *local_sync_backend_folder =
+      local_sync_backend_folder->Append(base_directory_.BaseName());
+  *local_sync_backend_folder =
+      local_sync_backend_folder->Append(kLoopbackServerBackendFilename);
+#endif  // defined(OS_WIN)
+  return enable_local_sync_backend;
+}
+
+}  // namespace syncer