public override async Task <ResponseMessage> ReadNextAsync(CancellationToken cancellationToken = default) { cancellationToken.ThrowIfCancellationRequested(); TryCatch <CrossPartitionChangeFeedAsyncEnumerator> monadicEnumerator = await this.lazyMonadicEnumerator.GetValueAsync(cancellationToken); if (monadicEnumerator.Failed) { Exception createException = monadicEnumerator.Exception; CosmosException cosmosException = ExceptionToCosmosException.CreateFromException(createException); return(new ResponseMessage( cosmosException.StatusCode, requestMessage: null, headers: cosmosException.Headers, cosmosException: cosmosException, diagnostics: new CosmosDiagnosticsContextCore())); } CrossPartitionChangeFeedAsyncEnumerator enumerator = monadicEnumerator.Result; if (!await enumerator.MoveNextAsync()) { throw new InvalidOperationException("ChangeFeed enumerator should always have a next continuation"); } if (enumerator.Current.Failed) { CosmosException cosmosException = ExceptionToCosmosException.CreateFromException(enumerator.Current.Exception); if (!IsRetriableException(cosmosException)) { this.hasMoreResults = false; } return(new ResponseMessage( cosmosException.StatusCode, requestMessage: null, headers: cosmosException.Headers, cosmosException: cosmosException, diagnostics: new CosmosDiagnosticsContextCore())); } CrossFeedRangePage <Pagination.ChangeFeedPage, ChangeFeedState> crossFeedRangePage = enumerator.Current.Result; Pagination.ChangeFeedPage changeFeedPage = crossFeedRangePage.Page; ResponseMessage responseMessage; if (changeFeedPage is Pagination.ChangeFeedSuccessPage changeFeedSuccessPage) { responseMessage = new ResponseMessage(statusCode: System.Net.HttpStatusCode.OK) { Content = changeFeedSuccessPage.Content }; } else { responseMessage = new ResponseMessage(statusCode: System.Net.HttpStatusCode.NotModified); } CrossFeedRangeState <ChangeFeedState> crossFeedRangeState = crossFeedRangePage.State; string continuationToken; if (this.changeFeedRequestOptions.EmitOldContinuationToken) { List <CompositeContinuationToken> compositeContinuationTokens = new List <CompositeContinuationToken>(); for (int i = 0; i < crossFeedRangeState.Value.Length; i++) { FeedRangeState <ChangeFeedState> changeFeedFeedRangeState = crossFeedRangeState.Value.Span[i]; string token = changeFeedFeedRangeState.State is ChangeFeedStateContinuation changeFeedStateContinuation ? ((CosmosString)changeFeedStateContinuation.ContinuationToken).Value : null; Documents.Routing.Range <string> range = ((FeedRangeEpk)changeFeedFeedRangeState.FeedRange).Range; CompositeContinuationToken compositeContinuationToken = new CompositeContinuationToken() { Range = range, Token = token, }; compositeContinuationTokens.Add(compositeContinuationToken); } FeedRangeCompositeContinuation feedRangeCompositeContinuationToken = new FeedRangeCompositeContinuation( await this.documentContainer.GetResourceIdentifierAsync(cancellationToken), FeedRangeEpk.FullRange, compositeContinuationTokens); continuationToken = feedRangeCompositeContinuationToken.ToString(); } else { ChangeFeedCrossFeedRangeState changeFeedCrossFeedRangeState = new ChangeFeedCrossFeedRangeState(crossFeedRangeState.Value); continuationToken = VersionedAndRidCheckedCompositeToken.ToCosmosElement( new VersionedAndRidCheckedCompositeToken( VersionedAndRidCheckedCompositeToken.Version.V2, changeFeedCrossFeedRangeState.ToCosmosElement(), await this.documentContainer.GetResourceIdentifierAsync(cancellationToken))).ToString(); } responseMessage.Headers.ContinuationToken = continuationToken; responseMessage.Headers.RequestCharge = changeFeedPage.RequestCharge; responseMessage.Headers.ActivityId = changeFeedPage.ActivityId; return(responseMessage); }
private async Task <ResponseMessage> ReadNextInternalAsync(ITrace trace, CancellationToken cancellationToken = default) { if (trace == null) { throw new ArgumentNullException(nameof(trace)); } TryCatch <CrossPartitionChangeFeedAsyncEnumerator> monadicEnumerator = await this.lazyMonadicEnumerator.GetValueAsync(trace, cancellationToken); if (monadicEnumerator.Failed) { Exception createException = monadicEnumerator.Exception; if (!ExceptionToCosmosException.TryCreateFromException( createException, trace, out CosmosException cosmosException)) { // Initialization issue, there are no enumerators to invoke this.hasMoreResults = false; throw createException; } return(new ResponseMessage( cosmosException.StatusCode, requestMessage: null, headers: cosmosException.Headers, cosmosException: cosmosException, trace: trace)); } CrossPartitionChangeFeedAsyncEnumerator enumerator = monadicEnumerator.Result; enumerator.SetCancellationToken(cancellationToken); try { if (!await enumerator.MoveNextAsync(trace)) { throw new InvalidOperationException("ChangeFeed enumerator should always have a next continuation"); } } catch (OperationCanceledException ex) when(!(ex is CosmosOperationCanceledException)) { throw new CosmosOperationCanceledException(ex, trace); } if (enumerator.Current.Failed) { if (!ExceptionToCosmosException.TryCreateFromException( enumerator.Current.Exception, trace, out CosmosException cosmosException)) { throw ExceptionWithStackTraceException.UnWrapMonadExcepion(enumerator.Current.Exception, trace); } if (!IsRetriableException(cosmosException)) { this.hasMoreResults = false; } return(new ResponseMessage( cosmosException.StatusCode, requestMessage: null, headers: cosmosException.Headers, cosmosException: cosmosException, trace: trace)); } CrossFeedRangePage <Pagination.ChangeFeedPage, ChangeFeedState> crossFeedRangePage = enumerator.Current.Result; Pagination.ChangeFeedPage changeFeedPage = crossFeedRangePage.Page; ResponseMessage responseMessage; if (changeFeedPage is Pagination.ChangeFeedSuccessPage changeFeedSuccessPage) { responseMessage = new ResponseMessage(statusCode: System.Net.HttpStatusCode.OK) { Content = changeFeedSuccessPage.Content }; } else { responseMessage = new ResponseMessage(statusCode: System.Net.HttpStatusCode.NotModified); } CrossFeedRangeState <ChangeFeedState> crossFeedRangeState = crossFeedRangePage.State; ChangeFeedCrossFeedRangeState changeFeedCrossFeedRangeState = new ChangeFeedCrossFeedRangeState(crossFeedRangeState.Value); string continuationToken = VersionedAndRidCheckedCompositeToken.ToCosmosElement( new VersionedAndRidCheckedCompositeToken( VersionedAndRidCheckedCompositeToken.Version.V2, changeFeedCrossFeedRangeState.ToCosmosElement(), await this.documentContainer.GetResourceIdentifierAsync(trace, cancellationToken))).ToString(); responseMessage.Headers.ContinuationToken = continuationToken; responseMessage.Headers.RequestCharge = changeFeedPage.RequestCharge; responseMessage.Headers.ActivityId = changeFeedPage.ActivityId; responseMessage.Trace = trace; return(responseMessage); }