lightweight variant (#1)
Reviewed-on: #1 Co-authored-by: Aleksandr Neychev <alexnejchev73@gmail.com>
This commit was merged in pull request #1.
This commit is contained in:
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using System.ComponentModel;
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using System.Globalization;
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using System.IO;
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using System.Net.Http;
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using System.Text.Json;
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using System.Windows.Data;
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using CommunityToolkit.Mvvm.ComponentModel;
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using CommunityToolkit.Mvvm.Input;
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using CursorLang.Core.Models;
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using CursorLang.Core.Services;
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namespace CursorLang.Settings.ViewModels;
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/// <summary>
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/// The updates section of the settings window.
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/// </summary>
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/// <remarks>
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/// A check made on opening the window passes its failures in silence: the machine does
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/// not always have a live network, and there is no point complaining about it to a user
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/// who came to change the popup colour. A check started by the button does report a
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/// failure — it is awaited and watched.
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/// </remarks>
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public sealed partial class UpdateViewModel : ObservableObject, IDisposable
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{
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private readonly IUpdateService _updates;
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private readonly ILocalizationService _localization;
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private readonly AppSettings _settings;
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private readonly UpdateOptions _options;
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private CancellationTokenSource? _work;
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private ReleaseInfo? _release;
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private string? _packagePath;
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[ObservableProperty]
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[NotifyPropertyChangedFor(nameof(StatusText))]
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[NotifyPropertyChangedFor(nameof(IsBusy))]
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[NotifyPropertyChangedFor(nameof(CanCheck))]
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[NotifyPropertyChangedFor(nameof(HasStatus))]
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[NotifyPropertyChangedFor(nameof(IsProgressUnknown))]
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[NotifyPropertyChangedFor(nameof(IsDownloadOffered))]
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[NotifyPropertyChangedFor(nameof(IsInstallOffered))]
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[NotifyPropertyChangedFor(nameof(IsProgressShown))]
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[NotifyPropertyChangedFor(nameof(IsReleaseLinkShown))]
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private UpdateStatus _status = UpdateStatus.Idle;
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/// <summary>The downloaded fraction: from 0 to 1.</summary>
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[ObservableProperty]
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[NotifyPropertyChangedFor(nameof(IsProgressUnknown))]
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private double _progress;
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public UpdateViewModel(
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IUpdateService updates,
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ILocalizationService localization,
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AppSettings settings,
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UpdateOptions options)
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{
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_updates = updates;
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_localization = localization;
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_settings = settings;
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_options = options;
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_localization.PropertyChanged += OnLocalizationChanged;
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}
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/// <summary>Whether to show the updates section at all.</summary>
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public bool IsSupported => _updates.IsSupported;
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public string CurrentVersion => _updates.CurrentVersion.ToString();
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/// <summary>Check for new versions at startup.</summary>
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public bool CheckAutomatically
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{
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get => _settings.CheckForUpdates;
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set
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{
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if (value == _settings.CheckForUpdates)
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{
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return;
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}
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_settings.CheckForUpdates = value;
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OnPropertyChanged();
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}
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}
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/// <summary>A request or a download is in flight — the buttons freeze for that time.</summary>
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public bool IsBusy => Status is UpdateStatus.Checking or UpdateStatus.Downloading;
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public bool CanCheck => !IsBusy;
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public bool HasStatus => Status != UpdateStatus.Idle;
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/// <summary>
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/// The package size is unknown, and the bar shows only the fact of the download.
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/// Its start looks the same until the first report arrives.
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/// </summary>
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public bool IsProgressUnknown => Status == UpdateStatus.Downloading && Progress <= 0;
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public bool IsDownloadOffered => Status == UpdateStatus.Available;
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public bool IsInstallOffered => Status == UpdateStatus.Ready;
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public bool IsProgressShown => Status == UpdateStatus.Downloading;
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public bool IsReleaseLinkShown => _release?.PageUrl is not null && Status is not UpdateStatus.Checking;
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/// <summary>The release page: the release notes live there too.</summary>
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public Uri? ReleaseUrl => _release?.PageUrl;
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public string StatusText => Status switch
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{
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UpdateStatus.Checking => _localization["UpdateChecking"],
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UpdateStatus.UpToDate => _localization["UpdateUpToDate"],
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UpdateStatus.Available => Format("UpdateAvailable", _release?.Tag),
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UpdateStatus.Downloading => _localization["UpdateDownloading"],
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UpdateStatus.Ready => _localization["UpdateReady"],
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UpdateStatus.Failed => _localization["UpdateFailed"],
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_ => string.Empty,
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};
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/// <summary>
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/// Checks for updates when the user has not forbidden it and enough time has
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/// passed since the previous check. Called once when the window opens.
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/// </summary>
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/// <remarks>
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/// It used to be called when the application started, which back then meant when
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/// the machine was switched on. The background half is a separate process now and
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/// does not go to the network at all — nothing in it could show the answer — so the
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/// question is asked when there is a window to answer into.
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/// </remarks>
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public async Task StartAsync()
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{
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if (!IsSupported || !_settings.CheckForUpdates)
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{
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return;
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}
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if (_settings.LastUpdateCheck is { } last && DateTimeOffset.UtcNow - last < _options.CheckInterval)
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{
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return;
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}
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await RunCheckAsync(quiet: true);
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}
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public void Dispose()
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{
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_localization.PropertyChanged -= OnLocalizationChanged;
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_work?.Cancel();
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_work?.Dispose();
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_work = null;
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}
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[RelayCommand]
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private Task CheckAsync() => RunCheckAsync(quiet: false);
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[RelayCommand]
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private async Task DownloadAsync()
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{
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if (_release is not { } release)
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{
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return;
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}
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CancellationToken token = StartWork();
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Progress = 0;
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Status = UpdateStatus.Downloading;
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try
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{
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var progress = new Progress<double>(value => Progress = value);
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_packagePath = await _updates.DownloadAsync(release, progress, token);
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Status = UpdateStatus.Ready;
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}
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catch (OperationCanceledException) when (token.IsCancellationRequested)
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{
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// The download was interrupted by the next piece of work: it has already set its own state
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}
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catch (Exception e) when (IsExpected(e))
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{
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Status = UpdateStatus.Failed;
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}
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}
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[RelayCommand]
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private void Install()
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{
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if (_packagePath is null || !File.Exists(_packagePath))
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{
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// The file was removed by the temp folder cleanup — downloading it again is what is left
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Status = _release is null ? UpdateStatus.Idle : UpdateStatus.Available;
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return;
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}
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try
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{
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_updates.Install(_packagePath);
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}
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catch (Exception e) when (IsExpected(e))
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{
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Status = UpdateStatus.Failed;
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}
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}
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/// <summary>
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/// The errors that simply leave the update undone: an unreachable network, an
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/// unexpected response, a file in use. Everything else is a reason to crash.
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/// </summary>
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/// <remarks>
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/// <c>OperationCanceledException</c> means an expired request deadline here:
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/// cancellation by the application itself is caught by a separate handler above.
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/// </remarks>
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private static bool IsExpected(Exception e) =>
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e is HttpRequestException or JsonException or IOException or UnauthorizedAccessException
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or NotSupportedException or InvalidOperationException or Win32Exception
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or OperationCanceledException;
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private async Task RunCheckAsync(bool quiet)
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{
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if (!IsSupported)
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{
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return;
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}
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CancellationToken token = StartWork();
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Status = UpdateStatus.Checking;
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try
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{
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_release = await _updates.CheckAsync(token);
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_packagePath = null;
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_settings.LastUpdateCheck = DateTimeOffset.UtcNow;
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Status = _release is null ? UpdateStatus.UpToDate : UpdateStatus.Available;
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}
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catch (OperationCanceledException) when (token.IsCancellationRequested)
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{
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// The check was cancelled by the next piece of work: it has already set its own state
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return;
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}
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catch (Exception e) when (IsExpected(e))
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{
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Status = quiet ? UpdateStatus.Idle : UpdateStatus.Failed;
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}
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OnPropertyChanged(nameof(ReleaseUrl));
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OnPropertyChanged(nameof(IsReleaseLinkShown));
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}
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/// <summary>
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/// Starts a new piece of work, cancelling the previous one: the user may have
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/// pressed "Check" in the middle of a download.
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/// </summary>
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private CancellationToken StartWork()
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{
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_work?.Cancel();
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_work?.Dispose();
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_work = new CancellationTokenSource();
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return _work.Token;
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}
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private string Format(string key, string? argument) =>
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string.Format(CultureInfo.CurrentCulture, _localization[key], argument);
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private void OnLocalizationChanged(object? sender, PropertyChangedEventArgs e)
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{
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if (e.PropertyName == Binding.IndexerName)
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{
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OnPropertyChanged(nameof(StatusText));
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}
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}
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}
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