| | | 1 | | using Microsoft.Extensions.Logging; |
| | | 2 | | using TeleFlow.Framework.RateLimiting; |
| | | 3 | | using TeleFlow.Framework.Updates; |
| | | 4 | | |
| | | 5 | | namespace TeleFlow.Framework.Middleware; |
| | | 6 | | |
| | | 7 | | /// <summary> |
| | | 8 | | /// Runs registered update-level rate limiters before the dispatcher receives the update. |
| | | 9 | | /// </summary> |
| | | 10 | | public sealed partial class UpdateRateLimitMiddleware : IUpdateMiddleware |
| | | 11 | | { |
| | | 12 | | private const int UpdateRejectedEventId = 1; |
| | | 13 | | |
| | | 14 | | private readonly IReadOnlyList<IUpdateRateLimiter> _rateLimiters; |
| | | 15 | | private readonly ILogger<UpdateRateLimitMiddleware>? _logger; |
| | | 16 | | |
| | | 17 | | public UpdateRateLimitMiddleware(IEnumerable<IUpdateRateLimiter> rateLimiters) |
| | | 18 | | { |
| | 3 | 19 | | ArgumentNullException.ThrowIfNull(rateLimiters); |
| | | 20 | | |
| | 3 | 21 | | _rateLimiters = rateLimiters.ToArray(); |
| | 3 | 22 | | } |
| | | 23 | | |
| | | 24 | | public UpdateRateLimitMiddleware( |
| | | 25 | | IEnumerable<IUpdateRateLimiter> rateLimiters, |
| | | 26 | | ILogger<UpdateRateLimitMiddleware> logger) |
| | 1 | 27 | | : this(rateLimiters) |
| | | 28 | | { |
| | 1 | 29 | | ArgumentNullException.ThrowIfNull(logger); |
| | | 30 | | |
| | 1 | 31 | | _logger = logger; |
| | 1 | 32 | | } |
| | | 33 | | |
| | | 34 | | public async Task InvokeAsync(UpdateContext context, UpdateDelegate next) |
| | | 35 | | { |
| | 3 | 36 | | ArgumentNullException.ThrowIfNull(context); |
| | 3 | 37 | | ArgumentNullException.ThrowIfNull(next); |
| | | 38 | | |
| | 13 | 39 | | foreach (var rateLimiter in _rateLimiters) |
| | | 40 | | { |
| | 4 | 41 | | var decision = await rateLimiter |
| | 4 | 42 | | .CheckAsync(context, context.CancellationToken) |
| | 4 | 43 | | .ConfigureAwait(false); |
| | | 44 | | |
| | 4 | 45 | | if (!decision.IsAccepted) |
| | | 46 | | { |
| | 1 | 47 | | if (_logger is not null) |
| | | 48 | | { |
| | 1 | 49 | | LogUpdateRejected( |
| | 1 | 50 | | _logger, |
| | 1 | 51 | | context.Payload.GetType().Name, |
| | 1 | 52 | | rateLimiter.GetType().FullName ?? rateLimiter.GetType().Name, |
| | 1 | 53 | | decision.RetryAfter, |
| | 1 | 54 | | decision.PolicyName ?? string.Empty); |
| | | 55 | | } |
| | | 56 | | |
| | 1 | 57 | | return; |
| | | 58 | | } |
| | 3 | 59 | | } |
| | | 60 | | |
| | 2 | 61 | | await next(context).ConfigureAwait(false); |
| | 3 | 62 | | } |
| | | 63 | | |
| | | 64 | | [LoggerMessage( |
| | | 65 | | EventId = UpdateRejectedEventId, |
| | | 66 | | Level = LogLevel.Warning, |
| | | 67 | | Message = "Update rejected by rate limiter. payload_type={PayloadType}, limiter={Limiter}, retry_after={RetryAft |
| | | 68 | | private static partial void LogUpdateRejected( |
| | | 69 | | ILogger logger, |
| | | 70 | | string payloadType, |
| | | 71 | | string limiter, |
| | | 72 | | TimeSpan? retryAfter, |
| | | 73 | | string policyName); |
| | | 74 | | } |