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// Copyright 2014 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/startup_controller.h"
#include <string>
#include "base/command_line.h"
#include "base/location.h"
#include "base/metrics/histogram.h"
#include "base/single_thread_task_runner.h"
#include "base/strings/string_number_conversions.h"
#include "base/thread_task_runner_handle.h"
#include "components/signin/core/browser/profile_oauth2_token_service.h"
#include "components/sync_driver/signin_manager_wrapper.h"
#include "components/sync_driver/sync_driver_switches.h"
#include "components/sync_driver/sync_prefs.h"
namespace browser_sync {
namespace {
// The amount of time we'll wait to initialize sync if no data type triggers
// initialization via a StartSyncFlare.
const int kDeferredInitFallbackSeconds = 10;
// Enum (for UMA, primarily) defining different events that cause us to
// exit the "deferred" state of initialization and invoke start_backend.
enum DeferredInitTrigger {
// We have received a signal from a SyncableService requesting that sync
// starts as soon as possible.
TRIGGER_DATA_TYPE_REQUEST,
// No data type requested sync to start and our fallback timer expired.
TRIGGER_FALLBACK_TIMER,
MAX_TRIGGER_VALUE
};
} // namespace
StartupController::StartupController(
const ProfileOAuth2TokenService* token_service,
const sync_driver::SyncPrefs* sync_prefs,
const SigninManagerWrapper* signin,
base::Closure start_backend)
: received_start_request_(false),
setup_in_progress_(false),
sync_prefs_(sync_prefs),
token_service_(token_service),
signin_(signin),
start_backend_(start_backend),
fallback_timeout_(
base::TimeDelta::FromSeconds(kDeferredInitFallbackSeconds)),
weak_factory_(this) {
if (base::CommandLine::ForCurrentProcess()->HasSwitch(
switches::kSyncDeferredStartupTimeoutSeconds)) {
int timeout = kDeferredInitFallbackSeconds;
if (base::StringToInt(
base::CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
switches::kSyncDeferredStartupTimeoutSeconds),
&timeout)) {
DCHECK_GE(timeout, 0);
DVLOG(2) << "Sync StartupController overriding startup timeout to "
<< timeout << " seconds.";
fallback_timeout_ = base::TimeDelta::FromSeconds(timeout);
}
}
}
StartupController::~StartupController() {}
void StartupController::Reset(const syncer::ModelTypeSet registered_types) {
received_start_request_ = false;
start_up_time_ = base::Time();
start_backend_time_ = base::Time();
// Don't let previous timers affect us post-reset.
weak_factory_.InvalidateWeakPtrs();
registered_types_ = registered_types;
}
void StartupController::set_setup_in_progress(bool in_progress) {
setup_in_progress_ = in_progress;
}
bool StartupController::StartUp(StartUpDeferredOption deferred_option) {
const bool first_start = start_up_time_.is_null();
if (first_start)
start_up_time_ = base::Time::Now();
if (deferred_option == STARTUP_BACKEND_DEFERRED &&
!base::CommandLine::ForCurrentProcess()->HasSwitch(
switches::kSyncDisableDeferredStartup) &&
sync_prefs_->GetPreferredDataTypes(registered_types_)
.Has(syncer::SESSIONS)) {
if (first_start) {
base::ThreadTaskRunnerHandle::Get()->PostDelayedTask(
FROM_HERE,
base::Bind(&StartupController::OnFallbackStartupTimerExpired,
weak_factory_.GetWeakPtr()),
fallback_timeout_);
}
return false;
}
if (start_backend_time_.is_null()) {
start_backend_time_ = base::Time::Now();
start_backend_.Run();
}
return true;
}
void StartupController::OverrideFallbackTimeoutForTest(
const base::TimeDelta& timeout) {
fallback_timeout_ = timeout;
}
bool StartupController::TryStart() {
if (sync_prefs_->IsManaged())
return false;
if (!sync_prefs_->IsSyncRequested())
return false;
if (signin_->GetAccountIdToUse().empty())
return false;
if (!token_service_)
return false;
if (!token_service_->RefreshTokenIsAvailable(signin_->GetAccountIdToUse())) {
return false;
}
// TODO(tim): Seems wrong to always record this histogram here...
// If we got here then tokens are loaded and user logged in and sync is
// enabled. If OAuth refresh token is not available then something is wrong.
// When PSS requests access token, OAuth2TokenService will return error and
// PSS will show error to user asking to reauthenticate.
UMA_HISTOGRAM_BOOLEAN("Sync.RefreshTokenAvailable", true);
// For performance reasons, defer the heavy lifting for sync init unless:
//
// - a datatype has requested an immediate start of sync, or
// - sync needs to start up the backend immediately to provide control state
// and encryption information to the UI, or
// - this is the first time sync is ever starting up.
if (received_start_request_ || setup_in_progress_ ||
!sync_prefs_->IsFirstSetupComplete()) {
return StartUp(STARTUP_IMMEDIATE);
} else {
return StartUp(STARTUP_BACKEND_DEFERRED);
}
}
void StartupController::RecordTimeDeferred() {
DCHECK(!start_up_time_.is_null());
base::TimeDelta time_deferred = base::Time::Now() - start_up_time_;
UMA_HISTOGRAM_CUSTOM_TIMES("Sync.Startup.TimeDeferred2",
time_deferred,
base::TimeDelta::FromSeconds(0),
base::TimeDelta::FromMinutes(2),
60);
}
void StartupController::OnFallbackStartupTimerExpired() {
DCHECK(!base::CommandLine::ForCurrentProcess()->HasSwitch(
switches::kSyncDisableDeferredStartup));
if (!start_backend_time_.is_null())
return;
DVLOG(2) << "Sync deferred init fallback timer expired, starting backend.";
RecordTimeDeferred();
UMA_HISTOGRAM_ENUMERATION("Sync.Startup.DeferredInitTrigger",
TRIGGER_FALLBACK_TIMER,
MAX_TRIGGER_VALUE);
received_start_request_ = true;
TryStart();
}
std::string StartupController::GetBackendInitializationStateString() const {
if (!start_backend_time_.is_null())
return "Started";
else if (!start_up_time_.is_null())
return "Deferred";
else
return "Not started";
}
void StartupController::OnDataTypeRequestsSyncStartup(syncer::ModelType type) {
if (base::CommandLine::ForCurrentProcess()->HasSwitch(
switches::kSyncDisableDeferredStartup)) {
DVLOG(2) << "Ignoring data type request for sync startup: "
<< syncer::ModelTypeToString(type);
return;
}
if (!start_backend_time_.is_null())
return;
DVLOG(2) << "Data type requesting sync startup: "
<< syncer::ModelTypeToString(type);
// Measure the time spent waiting for init and the type that triggered it.
// We could measure the time spent deferred on a per-datatype basis, but
// for now this is probably sufficient.
if (!start_up_time_.is_null()) {
RecordTimeDeferred();
UMA_HISTOGRAM_ENUMERATION("Sync.Startup.TypeTriggeringInit",
ModelTypeToHistogramInt(type),
syncer::MODEL_TYPE_COUNT);
UMA_HISTOGRAM_ENUMERATION("Sync.Startup.DeferredInitTrigger",
TRIGGER_DATA_TYPE_REQUEST,
MAX_TRIGGER_VALUE);
}
received_start_request_ = true;
TryStart();
}
} // namespace browser_sync
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