| | | 1 | | using System.Globalization; |
| | | 2 | | |
| | | 3 | | namespace TeleFlow.Telegram.Internal; |
| | | 4 | | |
| | | 5 | | internal static class TelegramRetryAfterDelayResolver |
| | | 6 | | { |
| | | 7 | | public static TelegramRetryAfterDelay? ResolveDelay( |
| | | 8 | | TelegramTransportResponse response, |
| | | 9 | | TelegramTransportEnvelope? envelope, |
| | | 10 | | TimeProvider timeProvider) |
| | | 11 | | { |
| | | 12 | | ArgumentNullException.ThrowIfNull(response); |
| | | 13 | | ArgumentNullException.ThrowIfNull(timeProvider); |
| | | 14 | | |
| | | 15 | | if (envelope?.ResponseParameters?.RetryAfter is long retryAfterFromEnvelope) |
| | | 16 | | { |
| | | 17 | | return CreateDelay(retryAfterFromEnvelope); |
| | | 18 | | } |
| | | 19 | | |
| | | 20 | | return response.TryGetHeaderValues("Retry-After", out var values) |
| | | 21 | | ? ResolveHeaderDelay(values, timeProvider) |
| | | 22 | | : null; |
| | | 23 | | } |
| | | 24 | | |
| | | 25 | | public static Task DelayAsync( |
| | | 26 | | TelegramRetryAfterDelay delay, |
| | | 27 | | TimeProvider timeProvider, |
| | | 28 | | CancellationToken cancellationToken) |
| | | 29 | | { |
| | | 30 | | return Task.Delay(delay.Value, timeProvider, cancellationToken); |
| | | 31 | | } |
| | | 32 | | |
| | | 33 | | private static TelegramRetryAfterDelay? ResolveHeaderDelay( |
| | | 34 | | IReadOnlyList<string> retryAfterHeaderValues, |
| | | 35 | | TimeProvider timeProvider) |
| | | 36 | | { |
| | | 37 | | foreach (var value in retryAfterHeaderValues) |
| | | 38 | | { |
| | | 39 | | if (string.IsNullOrWhiteSpace(value)) |
| | | 40 | | { |
| | | 41 | | continue; |
| | | 42 | | } |
| | | 43 | | |
| | | 44 | | if (long.TryParse(value, NumberStyles.Integer, CultureInfo.InvariantCulture, out var deltaSeconds)) |
| | | 45 | | { |
| | | 46 | | return CreateDelay(deltaSeconds); |
| | | 47 | | } |
| | | 48 | | |
| | | 49 | | if (DateTimeOffset.TryParse( |
| | | 50 | | value, |
| | | 51 | | CultureInfo.InvariantCulture, |
| | | 52 | | DateTimeStyles.AssumeUniversal | DateTimeStyles.AdjustToUniversal, |
| | | 53 | | out var date)) |
| | | 54 | | { |
| | | 55 | | var seconds = Math.Ceiling((date - timeProvider.GetUtcNow()).TotalSeconds); |
| | | 56 | | return CreateDelay((long)Math.Max(seconds, 0)); |
| | | 57 | | } |
| | | 58 | | } |
| | | 59 | | |
| | | 60 | | return null; |
| | | 61 | | } |
| | | 62 | | |
| | | 63 | | private static TelegramRetryAfterDelay? CreateDelay(long seconds) |
| | | 64 | | { |
| | | 65 | | return seconds is < 0 or > int.MaxValue |
| | | 66 | | ? null |
| | | 67 | | : new TelegramRetryAfterDelay((int)seconds); |
| | | 68 | | } |
| | | 69 | | } |
| | | 70 | | |
| | | 71 | | internal readonly record struct TelegramRetryAfterDelay(int Seconds) |
| | | 72 | | { |
| | 18 | 73 | | public TimeSpan Value => TimeSpan.FromSeconds(Seconds); |
| | | 74 | | } |