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implement WhenFirstSuccessful method for improved task handling

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HolographicHat
2025-10-22 06:21:22 +08:00
parent 27fa0d9c84
commit 9d22fdf6f9
1 changed files with 29 additions and 4 deletions
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33
YaeAchievement/src/Utils.cs
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@@ -35,18 +35,21 @@ public static class Utils {
//
if (_updateInfo?.CdnFiles.TryGetValue(path, out var cdnFile) == true) {
try {
var tasks = cdnFile.Urls.Select(url => GetFileFromCdn(url, cacheKey, cdnFile.Hash, cdnFile.Size));
var data = await Task.WhenAny(tasks).Unwrap();
var data = await cdnFile.Urls
.Select(url => GetFileFromCdn(url, cacheKey, cdnFile.Hash, cdnFile.Size))
.WhenFirstSuccessful()
.Unwrap();
transaction.Finish();
return data;
} catch (Exception e) when (e is SocketException or TaskCanceledException or HttpRequestException or InvalidDataException) {}
}
//
try {
var data = await Task.WhenAny(
var data = await WhenFirstSuccessful([
GetFileReal($"https://rin.holohat.work/{path}", cacheKey),
GetFileReal($"https://ena-rin.holohat.work//{path}", cacheKey),
GetFileReal($"https://cn-cd-1259389942.file.myqcloud.com/{path}", cacheKey)
).Unwrap();
]).Unwrap();
transaction.Finish();
return data;
} catch (Exception e) when (e is SocketException or TaskCanceledException or HttpRequestException) {
@@ -327,4 +330,26 @@ public static class Utils {
CultureInfo.CurrentUICulture = CultureInfo.GetCultureInfo("en-US"); // todo: use better way like auto set console font etc.
}
}
// https://stackoverflow.com/a/76953892
private static async Task<Task<TResult>> WhenFirstSuccessful<TResult>(this IEnumerable<Task<TResult>> tasks) {
var cts = new CancellationTokenSource();
Task<TResult>? selectedTask = null;
var continuations = tasks
.TakeWhile(_ => !cts.IsCancellationRequested)
.Select(task => {
return task.ContinueWith(t => {
if (t.IsCompletedSuccessfully) {
if (Interlocked.CompareExchange(ref selectedTask, t, null) is null) {
cts.Cancel();
}
}
}, cts.Token, TaskContinuationOptions.DenyChildAttach | TaskContinuationOptions.ExecuteSynchronously, TaskScheduler.Default);
});
var whenAll = Task.WhenAll(continuations);
try {
await whenAll.ConfigureAwait(false);
} catch when (whenAll.IsCanceled) { /* ignore */ }
return selectedTask!;
}
}