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// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chromeos/ash/components/phonehub/connection_scheduler_impl.h"
#include "base/functional/bind.h"
#include "base/notreached.h"
#include "base/task/sequenced_task_runner.h"
#include "chromeos/ash/components/multidevice/logging/logging.h"
#include "chromeos/ash/components/phonehub/feature_status.h"
#include "chromeos/ash/components/phonehub/phone_hub_structured_metrics_logger.h"
#include "chromeos/ash/services/secure_channel/public/cpp/client/connection_manager.h"
namespace ash::phonehub {
constexpr net::BackoffEntry::Policy kRetryBackoffPolicy = {
0, // Number of initial errors to ignore.
10 * 1000, // Initial delay of 10 seconds in ms.
2.0, // Factor by which the waiting time will be multiplied.
0.2, // Fuzzing percentage.
60 * 60 * 1000, // Maximum delay of 1 hour in ms.
-1, // Never discard the entry.
true, // Use initial delay.
};
ConnectionSchedulerImpl::ConnectionSchedulerImpl(
secure_channel::ConnectionManager* connection_manager,
FeatureStatusProvider* feature_status_provider,
PhoneHubStructuredMetricsLogger* phone_hub_structured_metrics_logger)
: connection_manager_(connection_manager),
feature_status_provider_(feature_status_provider),
phone_hub_structured_metrics_logger_(phone_hub_structured_metrics_logger),
retry_backoff_(&kRetryBackoffPolicy) {
DCHECK(connection_manager_);
DCHECK(feature_status_provider_);
current_feature_status_ = feature_status_provider_->GetStatus();
feature_status_provider_->AddObserver(this);
}
ConnectionSchedulerImpl::~ConnectionSchedulerImpl() {
feature_status_provider_->RemoveObserver(this);
weak_ptr_factory_.InvalidateWeakPtrs();
}
void ConnectionSchedulerImpl::ScheduleConnectionNow(
DiscoveryEntryPoint entry_point) {
if (feature_status_provider_->GetStatus() !=
FeatureStatus::kEnabledButDisconnected) {
PA_LOG(WARNING) << "ScheduleConnectionNow() could not request a connection "
<< "attempt because the current status is: "
<< feature_status_provider_->GetStatus() << ".";
return;
}
if (connection_manager_->AttemptNearbyConnection()) {
phone_hub_structured_metrics_logger_->LogPhoneHubDiscoveryStarted(
entry_point);
}
}
void ConnectionSchedulerImpl::OnFeatureStatusChanged() {
const FeatureStatus previous_feature_status = current_feature_status_;
current_feature_status_ = feature_status_provider_->GetStatus();
switch (current_feature_status_) {
// The following feature states indicate that there is an interruption with
// establishing connection to the host phone or that the feature is blocked
// from initiating a connection. Disconnect the existing connection, reset
// backoffs, and return early.
case FeatureStatus::kNotEligibleForFeature:
[[fallthrough]];
case FeatureStatus::kEligiblePhoneButNotSetUp:
[[fallthrough]];
case FeatureStatus::kPhoneSelectedAndPendingSetup:
[[fallthrough]];
case FeatureStatus::kDisabled:
[[fallthrough]];
case FeatureStatus::kUnavailableBluetoothOff:
[[fallthrough]];
case FeatureStatus::kLockOrSuspended:
DisconnectAndClearBackoffAttempts();
return;
// Connection has been established, clear existing backoffs and return
// early.
case FeatureStatus::kEnabledAndConnected:
ClearBackoffAttempts();
return;
// Connection is in progress, return and wait for the result.
case FeatureStatus::kEnabledAndConnecting:
return;
// Phone is available for connection, attempt to establish connection.
case FeatureStatus::kEnabledButDisconnected:
break;
}
DiscoveryEntryPoint entry_point = DiscoveryEntryPoint::kUserSignIn;
switch (previous_feature_status) {
case FeatureStatus::kEnabledAndConnecting:
PA_LOG(WARNING) << "Scheduling connection to retry in: "
<< retry_backoff_.GetTimeUntilRelease().InSeconds()
<< " seconds.";
retry_backoff_.InformOfRequest(/*succeeded=*/false);
base::SequencedTaskRunner::GetCurrentDefault()->PostDelayedTask(
FROM_HERE,
base::BindOnce(&ConnectionSchedulerImpl::ScheduleConnectionNow,
weak_ptr_factory_.GetWeakPtr(),
DiscoveryEntryPoint::kAutomaticConnectionRetry),
retry_backoff_.GetTimeUntilRelease());
return;
case FeatureStatus::kUnavailableBluetoothOff:
entry_point = DiscoveryEntryPoint::kBluetoothEnabled;
break;
case FeatureStatus::kLockOrSuspended:
entry_point = DiscoveryEntryPoint::kChromebookUnlock;
break;
case FeatureStatus::kDisabled:
entry_point = DiscoveryEntryPoint::kUserEnabledFeature;
break;
case FeatureStatus::kEnabledAndConnected:
entry_point = DiscoveryEntryPoint::kConnectionRetryAfterConnected;
break;
// When status transferred from kNotEligibleForFeature directly to
// kEnabledButDisconnected usually means user just sign in. Break to keep
// entry_point value to default.
case FeatureStatus::kNotEligibleForFeature:
break;
case FeatureStatus::kEligiblePhoneButNotSetUp:
[[fallthrough]];
case FeatureStatus::kPhoneSelectedAndPendingSetup:
entry_point = DiscoveryEntryPoint::kUserOnboardedToFeature;
break;
// Status should not transition from same status.
case FeatureStatus::kEnabledButDisconnected:
NOTREACHED();
}
ScheduleConnectionNow(entry_point);
}
void ConnectionSchedulerImpl::ClearBackoffAttempts() {
// Remove all pending ScheduleConnectionNow() backoff attempts.
weak_ptr_factory_.InvalidateWeakPtrs();
// Reset the state of the backoff so that the next backoff retry starts at
// the default initial delay.
retry_backoff_.Reset();
}
void ConnectionSchedulerImpl::DisconnectAndClearBackoffAttempts() {
ClearBackoffAttempts();
// Disconnect existing connection or connection attempt.
connection_manager_->Disconnect();
}
base::TimeDelta
ConnectionSchedulerImpl::GetCurrentBackoffDelayTimeForTesting() {
return retry_backoff_.GetTimeUntilRelease();
}
int ConnectionSchedulerImpl::GetBackoffFailureCountForTesting() {
return retry_backoff_.failure_count();
}
} // namespace ash::phonehub
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