93 lines
2.8 KiB
C#
93 lines
2.8 KiB
C#
/*
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* Copyright (c) 2024 ETH Zürich, IT Services
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*/
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using System;
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using System.Timers;
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using SafeExamBrowser.Logging.Contracts;
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using SafeExamBrowser.Settings.SystemComponents;
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using SafeExamBrowser.SystemComponents.Contracts.PowerSupply;
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using SafeExamBrowser.SystemComponents.Contracts.PowerSupply.Events;
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using PowerLineStatus = System.Windows.Forms.PowerLineStatus;
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using SystemInformation = System.Windows.Forms.SystemInformation;
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namespace SafeExamBrowser.SystemComponents.PowerSupply
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{
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public class PowerSupply : IPowerSupply
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{
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private readonly ILogger logger;
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private readonly PowerSupplySettings settings;
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private double critical;
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private double low;
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private DateTime lastStatusLog;
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private Timer timer;
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public event StatusChangedEventHandler StatusChanged;
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public PowerSupply(ILogger logger, PowerSupplySettings settings)
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{
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this.logger = logger;
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this.settings = settings;
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}
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public IPowerSupplyStatus GetStatus()
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{
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var charge = SystemInformation.PowerStatus.BatteryLifePercent;
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var hours = SystemInformation.PowerStatus.BatteryLifeRemaining / 3600;
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var minutes = (SystemInformation.PowerStatus.BatteryLifeRemaining - (hours * 3600)) / 60;
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var status = new PowerSupplyStatus();
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status.BatteryCharge = charge;
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status.BatteryChargeStatus = charge <= low ? (charge <= critical ? BatteryChargeStatus.Critical : BatteryChargeStatus.Low) : BatteryChargeStatus.Okay;
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status.BatteryTimeRemaining = new TimeSpan(hours, minutes, 0);
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status.IsOnline = SystemInformation.PowerStatus.PowerLineStatus == PowerLineStatus.Online;
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if (lastStatusLog < DateTime.Now.AddMinutes(-1))
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{
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logger.Debug($"Power grid is {(status.IsOnline ? "" : "not ")}connected, battery charge at {charge * 100}%{(status.IsOnline ? "" : $" ({status.BatteryTimeRemaining})")}.");
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lastStatusLog = DateTime.Now;
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}
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return status;
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}
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public void Initialize()
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{
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const int FIVE_SECONDS = 5000;
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critical = SanitizeThreshold(settings.ChargeThresholdCritical);
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low = SanitizeThreshold(settings.ChargeThresholdLow);
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timer = new Timer(FIVE_SECONDS);
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timer.Elapsed += Timer_Elapsed;
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timer.AutoReset = true;
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timer.Start();
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logger.Info($"Started monitoring the power supply (battery charge thresholds: low = {low * 100}%, critical = {critical * 100}%).");
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}
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public void Terminate()
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{
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if (timer != null)
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{
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timer.Stop();
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logger.Info("Stopped monitoring the power supply.");
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}
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}
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private double SanitizeThreshold(double value)
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{
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return value < 0 ? 0 : (value > 1 ? 1 : value);
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}
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private void Timer_Elapsed(object sender, ElapsedEventArgs e)
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{
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StatusChanged?.Invoke(GetStatus());
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}
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}
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}
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