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//
// Copyright (C) 2020 The Android Open Source Project
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
#ifndef UPDATE_ENGINE_UPDATE_MANAGER_UPDATE_TIME_RESTRICTIONS_MONITOR_H_
#define UPDATE_ENGINE_UPDATE_MANAGER_UPDATE_TIME_RESTRICTIONS_MONITOR_H_
#include <memory>
#include <base/memory/weak_ptr.h>
#include <brillo/message_loops/message_loop.h>
#include "update_engine/update_manager/device_policy_provider.h"
#include "update_engine/update_manager/evaluation_context.h"
#include "update_engine/update_manager/weekly_time.h"
namespace chromeos_update_manager {
// Represents a monitor tracking start of restricted time intervals during which
// update download is not allowed. It reads |var_disallowed_time_intervals|,
// chooses the next interval according to current time, awaits its start and
// notifies the delegate. If the chosen interval is already happening, the
// monitor notifies immediately. The monitor will never notify the delegate
// while the current list of restricted intervals is empty.
//
// The monitor detects changes in the restricted intervals and handles the
// change with following cases:
// 1. No restricted time intervals or none of the intervals is in progress -> no
// new restricted intervals or none of the new intervals matches the current
// time.
// The monitor starts tracking the next interval from the new ones, if any.
// 2. No restricted time intervals or none of the intervals is in progress ->
// there is a new interval matching current time.
// The monitor shall pick this new interval and notify the delegate
// immediately about the start of the restricted interval.
class UpdateTimeRestrictionsMonitor {
public:
// Interface to handle start of a restricted time interval.
class Delegate {
public:
virtual ~Delegate() = default;
virtual void OnRestrictedIntervalStarts() = 0;
};
// Creates an instance and starts monitoring the next nearest restricted time
// interval if present. If no intervals are available yet the monitor will be
// idle until intervals list changes.
UpdateTimeRestrictionsMonitor(DevicePolicyProvider* device_policy_provider,
Delegate* delegate);
UpdateTimeRestrictionsMonitor(const UpdateTimeRestrictionsMonitor&) = delete;
UpdateTimeRestrictionsMonitor& operator=(
const UpdateTimeRestrictionsMonitor&) = delete;
~UpdateTimeRestrictionsMonitor();
bool IsMonitoringInterval() {
return timeout_event_ != brillo::MessageLoop::kTaskIdNull;
}
private:
// Starts monitoring the start of nearest restricted time interval if present
// and any change in restricted time intervals from policy.
void StartMonitoring();
void WaitForRestrictedIntervalStarts(
const WeeklyTimeIntervalVector& restricted_time_intervals);
// Called when current time lies within a restricted interval.
void HandleRestrictedIntervalStarts();
// Stop monotoring any restricted intervals.
void StopMonitoring();
// Called upon change of restricted intervals.
void OnIntervalsChanged();
// To access restricted time intervals from |device_policy_provider_|.
EvaluationContext evaluation_context_;
DevicePolicyProvider* const device_policy_provider_;
Delegate* const delegate_;
// The TaskId returned by the message loop identifying the timeout callback.
// Used for cancelling the timeout callback.
brillo::MessageLoop::TaskId timeout_event_{brillo::MessageLoop::kTaskIdNull};
base::WeakPtrFactory<UpdateTimeRestrictionsMonitor> weak_ptr_factory_;
};
} // namespace chromeos_update_manager
#endif // UPDATE_ENGINE_UPDATE_MANAGER_UPDATE_TIME_RESTRICTIONS_MONITOR_H_
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