public RateLimitCounter ProcessRequest(ClientRequestIdentity requestIdentity, RateLimitRule rule) { var counter = new RateLimitCounter { Timestamp = DateTime.UtcNow, TotalRequests = 1 }; var counterId = ComputeCounterKey(requestIdentity, rule); // serial reads and writes lock (_processLocker) { var entry = _counterStore.Get(counterId); if (entry.HasValue) { // entry has not expired if (entry.Value.Timestamp + rule.PeriodTimespan.Value >= DateTime.UtcNow) { // increment request count var totalRequests = entry.Value.TotalRequests + 1; // deep copy counter = new RateLimitCounter { Timestamp = entry.Value.Timestamp, TotalRequests = totalRequests }; } } // stores: id (string) - timestamp (datetime) - total_requests (long) _counterStore.Set(counterId, counter, rule.PeriodTimespan.Value); } return(counter); }
public void Set(string id, RateLimitCounter counter, TimeSpan expirationTime) { _memoryCache.Set(id, counter, new MemoryCacheEntryOptions().SetAbsoluteExpiration(expirationTime)); }
public void Set(string id, RateLimitCounter counter, TimeSpan expirationTime) { _memoryCache.SetString(id, JsonConvert.SerializeObject(counter), new DistributedCacheEntryOptions().SetAbsoluteExpiration(expirationTime)); }
public virtual void LogBlockedRequest(HttpContext httpContext, ClientRequestIdentity identity, RateLimitCounter counter, RateLimitRule rule) { _logger.LogInformation($"Request {identity.HttpVerb}:{identity.Path} from ClientId {identity.ClientId} has been blocked, quota {rule.Limit}/{rule.Period} exceeded by {counter.TotalRequests}. Blocked by rule {rule.UrlRegex}, TraceIdentifier {httpContext.TraceIdentifier}."); }