public void UpdatePosition(EventPosition position)
{
if (position.PreparePosition <= _lastEventPosition.PreparePosition) // handle prepare only
throw new InvalidOperationException(
string.Format("Event at position {0} has been already processed", position));
_lastEventPosition = position;
}
public void UpdateToZero()
{
var zero = new EventPosition(0, -1);
if (_lastEventPosition != zero || _lastTag != null)
throw new InvalidOperationException("Posistion tagger has be already updated");
_lastTag = _positionTagger.MakeZeroCheckpointTag();
}
public TransactionFileReaderEventDistributionPoint(
IPublisher publisher, Guid distibutionPointCorrelationId, EventPosition from)
: base(publisher, distibutionPointCorrelationId)
{
if (publisher == null) throw new ArgumentNullException("publisher");
_from = @from;
}
public CommittedEventDistributed(
Guid correlationId, EventPosition position, string eventStreamId, int eventSequenceNumber,
bool resolvedLinkTo, Event data)
: this(correlationId, position, eventStreamId, eventSequenceNumber, eventStreamId, eventSequenceNumber,
resolvedLinkTo, data, position.PreparePosition, 11.1f)
{
}
public TransactionFileEventReader(IPublisher publisher, Guid distibutionPointCorrelationId, EventPosition @from, ITimeProvider timeProvider, bool stopOnEof = false, bool deliverEndOfTFPosition = true)
: base(publisher, distibutionPointCorrelationId, stopOnEof)
{
if (publisher == null) throw new ArgumentNullException("publisher");
_from = @from;
_deliverEndOfTfPosition = deliverEndOfTFPosition;
_timeProvider = timeProvider;
}
public TransactionFileReaderEventDistributionPoint(
IPublisher publisher, Guid distibutionPointCorrelationId, EventPosition from, bool deliverEndOfTFPosition = true)
: base(publisher, distibutionPointCorrelationId)
{
if (publisher == null) throw new ArgumentNullException("publisher");
_from = @from;
_deliverEndOfTfPosition = deliverEndOfTFPosition;
}
public bool ProcessEvent(
EventPosition position, CheckpointTag eventPosition, string streamId, string eventType, string category1, Guid eventId,
int sequenceNumber, string metadata, string data, out string newState, out EmittedEvent[] emittedEvents)
{
emittedEvents = null;
newState = null;
if (sequenceNumber != 0)
return false; // not our event
emittedEvents = new[] { new EmittedEvent(SystemStreams.StreamsStream, Guid.NewGuid(), SystemEventTypes.LinkTo, sequenceNumber + "@" + streamId, eventPosition, expectedTag: null) };
return true;
}
public bool ProcessEvent(
EventPosition position, string streamId, string eventType, string category1, Guid eventId,
int sequenceNumber, string metadata, string data, out string newState, out EmittedEvent[] emittedEvents)
{
emittedEvents = null;
newState = null;
if (sequenceNumber != 0)
return false; // not our event
emittedEvents = new[]
{new EmittedEvent("$streams", Guid.NewGuid(), "$>", sequenceNumber + "@" + streamId)};
return true;
}
//NOTE: committed event with null event _data means - end of the source reached.
// Current last available TF commit position is in _position.CommitPosition
// TODO: separate message?
public CommittedEventDistributed(
Guid correlationId, EventPosition position, string positionStreamId, int positionSequenceNumber,
string eventStreamId, int eventSequenceNumber, bool resolvedLinkTo, Event data,
long? safeTransactionFileReaderJoinPosition, float progress)
{
_correlationId = correlationId;
_data = data;
_safeTransactionFileReaderJoinPosition = safeTransactionFileReaderJoinPosition;
_progress = progress;
_position = position;
_positionStreamId = positionStreamId;
_positionSequenceNumber = positionSequenceNumber;
_eventStreamId = eventStreamId;
_eventSequenceNumber = eventSequenceNumber;
_resolvedLinkTo = resolvedLinkTo;
}
public bool ProcessEvent(
EventPosition position, string streamId, string eventType, string category1, Guid eventId,
int sequenceNumber, string metadata, string data, out string newState, out EmittedEvent[] emittedEvents)
{
emittedEvents = null;
newState = null;
if (sequenceNumber != 0)
return false; // not our event
var lastSlashPos = streamId.LastIndexOf(_separator);
if (lastSlashPos < 0)
return true; // handled but not interesting to us
var category = streamId.Substring(0, lastSlashPos);
emittedEvents = new[]
{new EmittedEvent("$category" + _separator + category, Guid.NewGuid(), "StreamCreated", streamId)};
return true;
}
public bool ProcessEvent(
EventPosition position, CheckpointTag eventPosition, string streamId, string eventType, string category1,
Guid eventId, int sequenceNumber, string metadata, string data, out string newState,
out EmittedEvent[] emittedEvents)
{
emittedEvents = null;
newState = null;
if (streamId.StartsWith(_indexStreamPrefix))
return false;
if (eventType == "$>")
return false;
emittedEvents = new[]
{
new EmittedEvent(
_indexStreamPrefix + eventType, Guid.NewGuid(), "$>", sequenceNumber + "@" + streamId,
eventPosition, expectedTag: null)
};
return true;
}
public ProjectionSubscription(
Guid projectionCorrelationId, CheckpointTag from,
IHandle<ProjectionMessage.Projections.CommittedEventReceived> eventHandler,
IHandle<ProjectionMessage.Projections.CheckpointSuggested> checkpointHandler,
CheckpointStrategy checkpointStrategy, long? checkpointUnhandledBytesThreshold)
{
if (eventHandler == null) throw new ArgumentNullException("eventHandler");
if (checkpointHandler == null) throw new ArgumentNullException("checkpointHandler");
if (checkpointStrategy == null) throw new ArgumentNullException("checkpointStrategy");
_eventHandler = eventHandler;
_checkpointHandler = checkpointHandler;
_checkpointStrategy = checkpointStrategy;
_checkpointUnhandledBytesThreshold = checkpointUnhandledBytesThreshold;
_projectionCorrelationId = projectionCorrelationId;
_lastPassedOrCheckpointedEventPosition = from.Position;
_eventFilter = checkpointStrategy.EventFilter;
_positionTagger = checkpointStrategy.PositionTagger;
_positionTracker = new PositionTracker(_positionTagger);
_positionTracker.UpdateByCheckpointTagInitial(from);
}
/// <summary>
/// Receives a batch of <see cref="EventData" /> from the Event Hub partition.
/// </summary>
///
/// <param name="maximumMessageCount">The maximum number of messages to receive in this batch.</param>
/// <param name="maximumWaitTime">The maximum amount of time to wait to build up the requested message count for the batch; if not specified, the per-try timeout specified by the retry policy will be used.</param>
/// <param name="cancellationToken">An optional <see cref="CancellationToken"/> instance to signal the request to cancel the operation.</param>
///
/// <returns>The batch of <see cref="EventData" /> from the Event Hub partition this consumer is associated with. If no events are present, an empty set is returned.</returns>
///
public override async Task <IReadOnlyList <EventData> > ReceiveAsync(int maximumMessageCount,
TimeSpan?maximumWaitTime,
CancellationToken cancellationToken)
{
Argument.AssertNotClosed(_closed, nameof(AmqpConsumer));
Argument.AssertAtLeast(maximumMessageCount, 1, nameof(maximumMessageCount));
var receivedEventCount = 0;
var failedAttemptCount = 0;
var tryTimeout = RetryPolicy.CalculateTryTimeout(0);
var waitTime = (maximumWaitTime ?? tryTimeout);
var link = default(ReceivingAmqpLink);
var retryDelay = default(TimeSpan?);
var amqpMessages = default(IEnumerable <AmqpMessage>);
var receivedEvents = default(List <EventData>);
var lastReceivedEvent = default(EventData);
var stopWatch = ValueStopwatch.StartNew();
try
{
while ((!cancellationToken.IsCancellationRequested) && (!_closed))
{
try
{
// Creation of the link happens without explicit knowledge of the cancellation token
// used for this operation; validate the token state before attempting link creation and
// again after the operation completes to provide best efforts in respecting it.
EventHubsEventSource.Log.EventReceiveStart(EventHubName, ConsumerGroup, PartitionId);
cancellationToken.ThrowIfCancellationRequested <TaskCanceledException>();
link = await ReceiveLink.GetOrCreateAsync(UseMinimum(ConnectionScope.SessionTimeout, tryTimeout)).ConfigureAwait(false);
cancellationToken.ThrowIfCancellationRequested <TaskCanceledException>();
var messagesReceived = await Task.Factory.FromAsync
(
(callback, state) => link.BeginReceiveMessages(maximumMessageCount, waitTime, callback, state),
(asyncResult) => link.EndReceiveMessages(asyncResult, out amqpMessages),
TaskCreationOptions.RunContinuationsAsynchronously
).ConfigureAwait(false);
cancellationToken.ThrowIfCancellationRequested <TaskCanceledException>();
// If event messages were received, then package them for consumption and
// return them.
if ((messagesReceived) && (amqpMessages != null))
{
receivedEvents ??= new List <EventData>();
foreach (AmqpMessage message in amqpMessages)
{
link.DisposeDelivery(message, true, AmqpConstants.AcceptedOutcome);
receivedEvents.Add(MessageConverter.CreateEventFromMessage(message));
message.Dispose();
}
receivedEventCount = receivedEvents.Count;
if (receivedEventCount > 0)
{
lastReceivedEvent = receivedEvents[receivedEventCount - 1];
if (lastReceivedEvent.Offset > long.MinValue)
{
CurrentEventPosition = EventPosition.FromOffset(lastReceivedEvent.Offset, false);
}
if (TrackLastEnqueuedEventProperties)
{
LastReceivedEvent = lastReceivedEvent;
}
}
return(receivedEvents);
}
// No events were available.
return(EmptyEventSet);
}
catch (EventHubsException ex) when(ex.Reason == EventHubsException.FailureReason.ServiceTimeout)
{
// Because the timeout specified with the request is intended to be the maximum
// amount of time to wait for events, a timeout isn't considered an error condition,
// rather a sign that no events were available in the requested period.
return(EmptyEventSet);
}
catch (Exception ex)
{
Exception activeEx = ex.TranslateServiceException(EventHubName);
// Determine if there should be a retry for the next attempt; if so enforce the delay but do not quit the loop.
// Otherwise, bubble the exception.
++failedAttemptCount;
retryDelay = RetryPolicy.CalculateRetryDelay(activeEx, failedAttemptCount);
if ((retryDelay.HasValue) && (!ConnectionScope.IsDisposed) && (!cancellationToken.IsCancellationRequested))
{
EventHubsEventSource.Log.EventReceiveError(EventHubName, ConsumerGroup, PartitionId, activeEx.Message);
await Task.Delay(UseMinimum(retryDelay.Value, waitTime.CalculateRemaining(stopWatch.GetElapsedTime())), cancellationToken).ConfigureAwait(false);
tryTimeout = RetryPolicy.CalculateTryTimeout(failedAttemptCount);
}
else if (ex is AmqpException)
{
ExceptionDispatchInfo.Capture(activeEx).Throw();
}
else
{
throw;
}
}
}
// If no value has been returned nor exception thrown by this point,
// then cancellation has been requested.
throw new TaskCanceledException();
}
catch (TaskCanceledException)
{
throw;
}
catch (Exception ex)
{
EventHubsEventSource.Log.EventReceiveError(EventHubName, ConsumerGroup, PartitionId, ex.Message);
throw;
}
finally
{
EventHubsEventSource.Log.EventReceiveComplete(EventHubName, ConsumerGroup, PartitionId, receivedEventCount);
}
}
public async Task ReceiverIdentifier()
{
await using (var scope = await EventHubScope.CreateAsync(2))
{
var connectionString = TestUtility.BuildEventHubsConnectionString(scope.EventHubName);
var ehClient = EventHubClient.CreateFromConnectionString(connectionString);
var receivers = new List <PartitionReceiver>();
try
{
for (int i = 0; i < 5; i++)
{
TestUtility.Log($"Creating receiver {i}");
var newReceiver = ehClient.CreateReceiver(PartitionReceiver.DefaultConsumerGroupName, "1", EventPosition.FromStart(),
new ReceiverOptions()
{
Identifier = $"receiver{i}"
});
// Issue a receive call so link will become active.
await newReceiver.ReceiveAsync(10);
receivers.Add(newReceiver);
}
try
{
// Attempt to create 6th receiver. This should fail.
var failReceiver = ehClient.CreateReceiver(PartitionReceiver.DefaultConsumerGroupName, "1", EventPosition.FromStart());
await failReceiver.ReceiveAsync(10);
throw new InvalidOperationException("6th receiver should have encountered QuotaExceededException.");
}
catch (QuotaExceededException ex)
{
TestUtility.Log($"Received expected exception {ex.GetType()}: {ex.Message}");
foreach (var receiver in receivers)
{
Assert.True(ex.Message.Contains(receiver.Identifier), $"QuotaExceededException message is missing receiver identifier '{receiver.Identifier}'");
}
}
}
finally
{
// Close all receivers.
foreach (var receiver in receivers)
{
await Task.WhenAll(
receiver.CloseAsync(),
ehClient.CloseAsync());
}
}
}
}
public bool CanJoinAt(EventPosition firstAvailableTransactionFileEvent, CheckpointTag eventCheckpointTag)
{
//NOTE: here the committed event MUST pass the projection subscription source filter as it was sent to us by specialized event
// distribution point. MakeCheckpointTag fails otherwise.
var result = _checkpointStrategy.IsCheckpointTagAfterEventPosition(
eventCheckpointTag, firstAvailableTransactionFileEvent);
if (result)
_logger.Trace(
"Projection subscription '{0}' can join distribution at '{1}' when the first available event is '{2}'",
_projectionCorrelationId, eventCheckpointTag, firstAvailableTransactionFileEvent);
return result;
}
public IPartitionReceiver CreateEpochReceiver(string consumerGroupName, string partitionId, EventPosition eventPosition, string offset, long epoch, ReceiverOptions receiverOptions)
{
return(new PartitionReceiverWrapper(this.inner.CreateEpochReceiver(consumerGroupName, partitionId, eventPosition, epoch, receiverOptions)));
}
async Task PartitionKeyValidation()
{
int NumberOfMessagesToSend = 100;
var partitionOffsets = new Dictionary <string, string>();
// Discover the end of stream on each partition.
TestUtility.Log("Discovering end of stream on each partition.");
foreach (var partitionId in this.PartitionIds)
{
var lastEvent = await this.EventHubClient.GetPartitionRuntimeInformationAsync(partitionId);
partitionOffsets.Add(partitionId, lastEvent.LastEnqueuedOffset);
TestUtility.Log($"Partition {partitionId} has last message with offset {lastEvent.LastEnqueuedOffset}");
}
// Now send a set of messages with different partition keys.
TestUtility.Log($"Sending {NumberOfMessagesToSend} messages.");
Random rnd = new Random();
for (int i = 0; i < NumberOfMessagesToSend; i++)
{
var partitionKey = rnd.Next(10);
await this.EventHubClient.SendAsync(new EventData(Encoding.UTF8.GetBytes("Hello EventHub!")), partitionKey.ToString());
}
// It is time to receive all messages that we just sent.
// Prepare partition key to partition map while receiving.
// Validation: All messages of a partition key should be received from a single partition.
TestUtility.Log("Starting to receive all messages from each partition.");
var receiveTasks = new Dictionary <string, Task <List <EventData> > >();
var receivers = new List <PartitionReceiver>();
foreach (var partitionId in this.PartitionIds)
{
var receiver = this.EventHubClient.CreateReceiver(
PartitionReceiver.DefaultConsumerGroupName,
partitionId,
EventPosition.FromOffset(partitionOffsets[partitionId]));
receivers.Add(receiver);
receiveTasks.Add(partitionId, ReceiveAllMessages(receiver));
}
int totalReceived = 0;
var partitionMap = new Dictionary <string, string>();
try
{
foreach (var receiveTask in receiveTasks)
{
var partitionId = receiveTask.Key;
var messagesFromPartition = await receiveTask.Value;
totalReceived += messagesFromPartition.Count;
TestUtility.Log($"Received {messagesFromPartition.Count} messages from partition {partitionId}.");
foreach (var ed in messagesFromPartition)
{
var pk = ed.SystemProperties.PartitionKey;
if (partitionMap.ContainsKey(pk) && partitionMap[pk] != partitionId)
{
throw new Exception($"Received a message from partition {partitionId} with partition key {pk}, whereas the same key was observed on partition {partitionMap[pk]} before.");
}
partitionMap[pk] = partitionId;
}
}
}
finally
{
foreach (var receiver in receivers)
{
await receiver.CloseAsync();
}
}
Assert.True(totalReceived == NumberOfMessagesToSend,
$"Didn't receive the same number of messages that we sent. Sent: {NumberOfMessagesToSend}, Received: {totalReceived}");
}
public async Task SendAndReceive()
{
string targetPartitionId = "0";
TestUtility.Log("Creating Event Hub client");
await using (var scope = await EventHubScope.CreateAsync(1))
{
var connectionString = TestUtility.BuildEventHubsConnectionString(scope.EventHubName);
var ehClient = EventHubClient.CreateFromConnectionString(GetWebSocketConnectionString(connectionString));
PartitionSender sender = null;
try
{
// Send single message
TestUtility.Log("Sending single event");
sender = ehClient.CreatePartitionSender(targetPartitionId);
var eventData = new EventData(Encoding.UTF8.GetBytes("This event will be transported via web-sockets"));
await sender.SendAsync(eventData);
}
finally
{
await sender?.CloseAsync();
}
PartitionReceiver receiver = null;
try
{
// Receive single message.
TestUtility.Log("Receiving single event");
receiver = ehClient.CreateReceiver(PartitionReceiver.DefaultConsumerGroupName, targetPartitionId, EventPosition.FromStart());
var msg = await receiver.ReceiveAsync(1);
Assert.True(msg != null, $"Failed to receive single event from partition {targetPartitionId}");
}
finally
{
await receiver?.CloseAsync();
}
}
}
public RequiresEventPosition(EventPosition eventPosition)
{
_eventPosition = eventPosition;
_eventService = ObjectFactory.GetInstance<IEventService>();
}
public async Task SendBatchWithPartitionKey()
{
string targetPartitionKey = "this is the partition key";
var ehClient = EventHubClient.CreateFromConnectionString(TestUtility.EventHubsConnectionString);
var receiver = default(PartitionReceiver);
try
{
// Mark end of each partition so that we can start reading from there.
var partitionIds = await this.GetPartitionsAsync(ehClient);
var partitions = await TestUtility.DiscoverEndOfStreamForPartitionsAsync(ehClient, partitionIds);
// Send a batch of 2 messages.
using (var eventData1 = new EventData(Guid.NewGuid().ToByteArray()))
using (var eventData2 = new EventData(Guid.NewGuid().ToByteArray()))
{
await ehClient.SendAsync(new[] { eventData1, eventData2 }, targetPartitionKey);
}
// Now find out the partition where our messages landed.
var targetPartition = "";
foreach (var pId in partitionIds)
{
var pInfo = await ehClient.GetPartitionRuntimeInformationAsync(pId);
if (pInfo.LastEnqueuedOffset != partitions[pId])
{
targetPartition = pId;
TestUtility.Log($"Batch landed on partition {targetPartition}");
}
}
// Confirm that we identified the partition with our messages.
Assert.True(targetPartition != "", "None of the partition offsets moved.");
// Receive all messages from target partition.
receiver = ehClient.CreateReceiver(PartitionReceiver.DefaultConsumerGroupName, targetPartition, EventPosition.FromOffset(partitions[targetPartition]));
var messages = await ReceiveAllMessagesAsync(receiver);
// Validate 2 messages received.
Assert.True(messages.Count == 2, $"Received {messages.Count} messages instead of 2.");
// Validate both messages carry correct partition id.
Assert.True(messages[0].SystemProperties.PartitionKey == targetPartitionKey,
$"First message returned partition key value '{messages[0].SystemProperties.PartitionKey}'");
Assert.True(messages[1].SystemProperties.PartitionKey == targetPartitionKey,
$"Second message returned partition key value '{messages[1].SystemProperties.PartitionKey}'");
}
finally
{
await Task.WhenAll(
receiver?.CloseAsync(),
ehClient.CloseAsync());
}
}
public override EventHubWrappers.IPartitionReceiver CreateEpochReceiver(string consumerGroupName, string partitionId, EventPosition eventPosition, long epoch, ReceiverOptions receiverOptions)
{
long startSeq = CalculateStartSeq(eventPosition);
return(new TimeoutPartitionReceiverMock(partitionId, startSeq, this.token, this.csb.OperationTimeout));
}
public bool ProcessEvent(
EventPosition position, CheckpointTag eventPosition, string streamId, string eventType, string category1, Guid eventId, int sequenceNumber, string metadata,
string data, out string newState, out EmittedEvent[] emittedEvents)
{
emittedEvents = null;
newState = null;
if (streamId.StartsWith(_categoryStreamPrefix))
return false;
var lastSlashPos = streamId.LastIndexOf(_separator);
if (lastSlashPos < 0)
return true; // handled but not interesting to us
var category = streamId.Substring(0, lastSlashPos);
emittedEvents = new[]
{
new EmittedEvent(
_categoryStreamPrefix + category, Guid.NewGuid(), "$>", sequenceNumber + "@" + streamId, eventPosition, expectedTag: null)
};
return true;
}
public void UpdateByCheckpointTag(CheckpointTag checkpointTag)
{
var zero = new EventPosition(0, -1);
if (_lastEventPosition != zero || _lastTag != null)
throw new InvalidOperationException("Posistion tagger has be already updated");
_lastEventPosition = checkpointTag.Position;
_lastTag = checkpointTag;
}
public void Handle(ProjectionMessage.Projections.CommittedEventDistributed message)
{
if (message.Data == null)
throw new NotSupportedException();
// NOTE: we may receive here messages from heading event distribution point
// and they may not pass out source filter. Discard them first
if (!_eventFilter.PassesSource(message.ResolvedLinkTo, message.PositionStreamId))
return;
var eventCheckpointTag = _positionTagger.MakeCheckpointTag(_positionTracker.LastTag, message);
//TODO: when joining heading distribution point replayed events may cause invalid operation exception on comparison
if (eventCheckpointTag <= _positionTracker.LastTag)
{
_logger.Trace(
"Skipping replayed event {0}@{1} at position {2}. the last processed event checkpoint tag is: {3}",
message.PositionSequenceNumber, message.PositionStreamId, message.Position, _positionTracker.LastTag);
return;
}
_positionTracker.UpdateByCheckpointTagForward(eventCheckpointTag);
if (_eventFilter.Passes(message.ResolvedLinkTo, message.PositionStreamId, message.Data.EventType))
{
_lastPassedOrCheckpointedEventPosition = message.Position;
var convertedMessage =
ProjectionMessage.Projections.CommittedEventReceived.FromCommittedEventDistributed(message, eventCheckpointTag);
_eventHandler.Handle(convertedMessage);
}
else
{
if (_checkpointUnhandledBytesThreshold != null
&& message.Position.CommitPosition - _lastPassedOrCheckpointedEventPosition.CommitPosition
> _checkpointUnhandledBytesThreshold)
{
_lastPassedOrCheckpointedEventPosition = message.Position;
_checkpointHandler.Handle(
new ProjectionMessage.Projections.CheckpointSuggested(
_projectionCorrelationId, _positionTracker.LastTag));
}
}
}
public override void Handle(ClientMessage.ReadAllEventsForwardCompleted message)
{
if (_disposed)
return;
if (!_eventsRequested)
throw new InvalidOperationException("Read events has not been requested");
if (_paused)
throw new InvalidOperationException("Paused");
_eventsRequested = false;
if (message.Result.Events.Length == 0)
{
// the end
if (_deliverEndOfTfPosition)
DeliverLastCommitPosition(_from);
// allow joining heading distribution
SendIdle();
SendEof();
}
else
{
for (int index = 0; index < message.Result.Events.Length; index++)
{
var @event = message.Result.Events[index];
DeliverEvent(@event, message.Result.TfEofPosition);
}
_from = message.Result.NextPos;
}
if (_disposed)
return;
if (_pauseRequested)
_paused = true;
else if (message.Result.Events.Length == 0)
RequestEvents(delay: true);
else
_publisher.Publish(CreateTickMessage());
}
public bool ProcessEvent(
EventPosition position, CheckpointTag eventPosition, string streamId, string eventType, string category, Guid eventId, int sequenceNumber,
string metadata, string data, out string newState, out EmittedEvent[] emittedEvents)
{
if (_failOnProcessEvent)
{
throw new Exception("PROCESS_EVENT_FAILED");
}
_lastProcessedStreamId = streamId;
_lastProcessedEventType = eventType;
_lastProcessedEventId = eventId;
_lastProcessedSequencenumber = sequenceNumber;
_lastProcessedMetadata = metadata;
_lastProcessedData = data;
_eventsProcessed++;
switch (eventType)
{
case "skip_this_type":
_loadedState = newState = null;
emittedEvents = null;
return(false);
case "handle_this_type":
_loadedState = newState = data;
emittedEvents = null;
return(true);
case "append":
_loadedState = newState = _loadedState + data;
emittedEvents = null;
return(true);
case "no_state_emit1_type":
_loadedState = newState = "";
emittedEvents = new[]
{ new EmittedEvent(_emit1StreamId, Guid.NewGuid(), _emit1EventType, _emit1Data, eventPosition, null), };
return(true);
case "emit1_type":
_loadedState = newState = data;
emittedEvents = new[] { new EmittedEvent(_emit1StreamId, Guid.NewGuid(), _emit1EventType, _emit1Data, eventPosition, null), };
return(true);
case "emit22_type":
_loadedState = newState = data;
emittedEvents = new[]
{
new EmittedEvent(_emit2StreamId, Guid.NewGuid(), _emit2EventType, _emit1Data, eventPosition, null),
new EmittedEvent(_emit2StreamId, Guid.NewGuid(), _emit2EventType, _emit2Data, eventPosition, null),
};
return(true);
case "emit212_type":
_loadedState = newState = data;
emittedEvents = new[]
{
new EmittedEvent(_emit2StreamId, Guid.NewGuid(), _emit2EventType, _emit1Data, eventPosition, null),
new EmittedEvent(_emit1StreamId, Guid.NewGuid(), _emit1EventType, _emit2Data, eventPosition, null),
new EmittedEvent(_emit2StreamId, Guid.NewGuid(), _emit2EventType, _emit3Data, eventPosition, null),
};
return(true);
case "emit12_type":
_loadedState = newState = data;
emittedEvents = new[]
{
new EmittedEvent(_emit1StreamId, Guid.NewGuid(), _emit1EventType, _emit1Data, eventPosition, null),
new EmittedEvent(_emit2StreamId, Guid.NewGuid(), _emit2EventType, _emit2Data, eventPosition, null),
};
return(true);
default:
throw new NotSupportedException();
}
}
public void ConstructorRequiresTheConnectionScope()
{
Assert.That(() => new AmqpEventHubConsumer("theMostAwesomeHubEvar", "$DEFAULT", "0", EventPosition.FromSequenceNumber(123), new EventHubConsumerOptions(), null, Mock.Of <AmqpMessageConverter>(), Mock.Of <EventHubRetryPolicy>(), null), Throws.ArgumentNullException);
}
private static async Task MainAsync()
{
Console.WriteLine("Connecting to event hub...");
var eventHubClient =
EventHubClient.CreateFromConnectionString(connectionString);
var runtimeInformation = await eventHubClient.GetRuntimeInformationAsync();
var partitionReceivers = runtimeInformation.PartitionIds.Select(partitionId =>
eventHubClient.CreateReceiver("wired_brain_coffee_console_direct", partitionId, EventPosition.FromStart())).ToList();
Console.WriteLine("Waiting for incoming events...");
foreach (var partitionReceiver in partitionReceivers)
{
partitionReceiver.SetReceiveHandler(
new WiredBrainCoffeePartitionReceiveHandler(partitionReceiver.PartitionId));
}
Console.WriteLine($"Press any key to shut down");
Console.ReadLine();
await eventHubClient.CloseAsync();
}
/// <summary>
/// Retrieves a list of all the checkpoints in a data store for a given namespace, Event Hub and consumer group.
/// </summary>
///
/// <param name="fullyQualifiedNamespace">The fully qualified Event Hubs namespace the ownership are associated with. This is likely to be similar to <c>{yournamespace}.servicebus.windows.net</c>.</param>
/// <param name="eventHubName">The name of the specific Event Hub the ownership are associated with, relative to the Event Hubs namespace that contains it.</param>
/// <param name="consumerGroup">The name of the consumer group the ownership are associated with.</param>
/// <param name="cancellationToken">A <see cref="CancellationToken" /> instance to signal the request to cancel the operation.</param>
///
/// <returns>An enumerable containing all the existing checkpoints for the associated Event Hub and consumer group.</returns>
///
public override async Task <IEnumerable <EventProcessorCheckpoint> > ListCheckpointsAsync(string fullyQualifiedNamespace,
string eventHubName,
string consumerGroup,
CancellationToken cancellationToken)
{
cancellationToken.ThrowIfCancellationRequested <TaskCanceledException>();
ListCheckpointsStart(fullyQualifiedNamespace, eventHubName, consumerGroup);
async Task <List <EventProcessorCheckpoint> > listCheckpointsAsync(CancellationToken listCheckpointsToken)
{
var prefix = string.Format(CultureInfo.InvariantCulture, CheckpointPrefix, fullyQualifiedNamespace.ToLowerInvariant(), eventHubName.ToLowerInvariant(), consumerGroup.ToLowerInvariant());
var checkpoints = new List <EventProcessorCheckpoint>();
await foreach (BlobItem blob in ContainerClient.GetBlobsAsync(traits: BlobTraits.Metadata, prefix: prefix, cancellationToken: listCheckpointsToken).ConfigureAwait(false))
{
var partitionId = blob.Name.Substring(prefix.Length);
var startingPosition = default(EventPosition?);
var offset = default(long?);
var sequenceNumber = default(long?);
if (blob.Metadata.TryGetValue(BlobMetadataKey.Offset, out var str) && long.TryParse(str, NumberStyles.Integer, CultureInfo.InvariantCulture, out var result))
{
offset = result;
startingPosition = EventPosition.FromOffset(result, false);
}
else if (blob.Metadata.TryGetValue(BlobMetadataKey.SequenceNumber, out str) && long.TryParse(str, NumberStyles.Integer, CultureInfo.InvariantCulture, out result))
{
sequenceNumber = result;
startingPosition = EventPosition.FromSequenceNumber(result, false);
}
// If either the offset or the sequence number was not populated,
// this is not a valid checkpoint.
if (startingPosition.HasValue)
{
checkpoints.Add(new BlobStorageCheckpoint
{
FullyQualifiedNamespace = fullyQualifiedNamespace,
EventHubName = eventHubName,
ConsumerGroup = consumerGroup,
PartitionId = partitionId,
StartingPosition = startingPosition.Value,
Offset = offset,
SequenceNumber = sequenceNumber
});
}
else
{
InvalidCheckpointFound(partitionId, fullyQualifiedNamespace, eventHubName, consumerGroup);
}
}
return(checkpoints);
};
async Task <List <EventProcessorCheckpoint> > listLegacyCheckpointsAsync(List <EventProcessorCheckpoint> existingCheckpoints, CancellationToken listCheckpointsToken)
{
// Legacy checkpoints are not normalized to lowercase
var legacyPrefix = string.Format(CultureInfo.InvariantCulture, LegacyCheckpointPrefix, fullyQualifiedNamespace, eventHubName, consumerGroup);
var checkpoints = new List <EventProcessorCheckpoint>();
await foreach (BlobItem blob in ContainerClient.GetBlobsAsync(prefix: legacyPrefix, cancellationToken: listCheckpointsToken).ConfigureAwait(false))
{
// Skip new checkpoints and empty blobs
if (blob.Properties.ContentLength == 0)
{
continue;
}
var partitionId = blob.Name.Substring(legacyPrefix.Length);
// Check whether there is already a checkpoint for this partition id
if (existingCheckpoints.Any(existingCheckpoint => string.Equals(existingCheckpoint.PartitionId, partitionId, StringComparison.Ordinal)))
{
continue;
}
var startingPosition = default(EventPosition?);
BlobBaseClient blobClient = ContainerClient.GetBlobClient(blob.Name);
using var memoryStream = new MemoryStream();
await blobClient.DownloadToAsync(memoryStream, listCheckpointsToken).ConfigureAwait(false);
TryReadLegacyCheckpoint(
memoryStream.GetBuffer().AsSpan(0, (int)memoryStream.Length),
out long?offset,
out long?sequenceNumber);
if (offset.HasValue)
{
startingPosition = EventPosition.FromOffset(offset.Value, false);
}
else if (sequenceNumber.HasValue)
{
startingPosition = EventPosition.FromSequenceNumber(sequenceNumber.Value, false);
}
if (startingPosition.HasValue)
{
checkpoints.Add(new BlobStorageCheckpoint
{
FullyQualifiedNamespace = fullyQualifiedNamespace,
EventHubName = eventHubName,
ConsumerGroup = consumerGroup,
PartitionId = partitionId,
StartingPosition = startingPosition.Value,
Offset = offset,
SequenceNumber = sequenceNumber
});
}
else
{
InvalidCheckpointFound(partitionId, fullyQualifiedNamespace, eventHubName, consumerGroup);
}
}
return(checkpoints);
};
List <EventProcessorCheckpoint> checkpoints = null;
try
{
checkpoints = await ApplyRetryPolicy(listCheckpointsAsync, cancellationToken).ConfigureAwait(false);
if (InitializeWithLegacyCheckpoints)
{
checkpoints.AddRange(await ApplyRetryPolicy(ct => listLegacyCheckpointsAsync(checkpoints, ct), cancellationToken).ConfigureAwait(false));
}
return(checkpoints);
}
catch (RequestFailedException ex) when(ex.ErrorCode == BlobErrorCode.ContainerNotFound)
{
ListCheckpointsError(fullyQualifiedNamespace, eventHubName, consumerGroup, ex);
throw new RequestFailedException(BlobsResourceDoesNotExist);
}
catch (Exception ex)
{
ListCheckpointsError(fullyQualifiedNamespace, eventHubName, consumerGroup, ex);
throw;
}
finally
{
ListCheckpointsComplete(fullyQualifiedNamespace, eventHubName, consumerGroup, checkpoints?.Count ?? 0);
}
}
public async Task InvalidProxy()
{
// Send call should fail.
await Assert.ThrowsAsync <WebSocketException>(async() =>
{
await using (var scope = await EventHubScope.CreateAsync(2))
{
var connectionString = TestUtility.BuildEventHubsConnectionString(scope.EventHubName);
var ehClient = EventHubClient.CreateFromConnectionString(GetWebSocketConnectionString(connectionString));
ehClient.WebProxy = new WebProxy("http://1.2.3.4:9999");
var edToFail = new EventData(Encoding.UTF8.GetBytes("This is a sample event."));
await ehClient.SendAsync(edToFail);
}
});
// Receive call should fail.
await Assert.ThrowsAsync <WebSocketException>(async() =>
{
await using (var scope = await EventHubScope.CreateAsync(2))
{
var connectionString = TestUtility.BuildEventHubsConnectionString(scope.EventHubName);
var ehClient = EventHubClient.CreateFromConnectionString(GetWebSocketConnectionString(connectionString));
ehClient.WebProxy = new WebProxy("http://1.2.3.4:9999");
await ehClient.CreateReceiver(PartitionReceiver.DefaultConsumerGroupName, "0", EventPosition.FromStart()).ReceiveAsync(1);
}
});
// Management link call should fail.
await Assert.ThrowsAsync <WebSocketException>(async() =>
{
await using (var scope = await EventHubScope.CreateAsync(2))
{
var connectionString = TestUtility.BuildEventHubsConnectionString(scope.EventHubName);
var ehClient = EventHubClient.CreateFromConnectionString(GetWebSocketConnectionString(connectionString));
ehClient.WebProxy = new WebProxy("http://1.2.3.4:9999");
await ehClient.GetRuntimeInformationAsync();
}
});
// Send/receive should work fine w/o proxy.
await using (var scope = await EventHubScope.CreateAsync(2))
{
var connectionString = TestUtility.BuildEventHubsConnectionString(scope.EventHubName);
var ehNoProxyClient = EventHubClient.CreateFromConnectionString(GetWebSocketConnectionString(connectionString));
var eventData = new EventData(Encoding.UTF8.GetBytes("This is a sample event."));
}
}
private void DeliverEvent(ResolvedEventRecord @event, long lastCommitPosition)
{
EventRecord positionEvent = (@event.Link ?? @event.Event);
var receivedPosition = new EventPosition(@event.CommitPosition, positionEvent.LogPosition);
if (_from > receivedPosition)
throw new Exception(
string.Format(
"ReadFromTF returned events in incorrect order. Last known position is: {0}. Received position is: {1}",
_from, receivedPosition));
_publisher.Publish(
new ProjectionCoreServiceMessage.CommittedEventDistributed(
_distibutionPointCorrelationId, receivedPosition, positionEvent.EventStreamId,
positionEvent.EventNumber, @event.Event.EventStreamId, @event.Event.EventNumber, @event.Link != null,
new Event(
@event.Event.EventId, @event.Event.EventType, (@event.Event.Flags & PrepareFlags.IsJson) != 0,
@event.Event.Data, @event.Event.Metadata), receivedPosition.PreparePosition, 100.0f * positionEvent.LogPosition / lastCommitPosition));
}
/// <summary>
/// Creates an PartitionReceiver from the given connection sting and partition key.
/// The Reliable Dictionaries are used to create a receiver from wherever the service last left off,
/// or from the current date/time if it's the first time the service is coming up.
/// </summary>
/// <param name="client"></param>
/// <param name="consumerGroup"></param>
/// <param name="servicePartitionKey"></param>
/// <param name="epochDictionary"></param>
/// <param name="offsetDictionary"></param>
/// <returns>PartitionReceiver</returns>
private async Task <PartitionReceiver> ConnectToIoTHubAsync(
EventHubClient client,
string consumerGroup,
long servicePartitionKey,
IReliableDictionary <string, long> epochDictionary,
IReliableDictionary <string, string> offsetDictionary)
{
// This gives each partition its own dedicated TCP connection to IoT Hub.
var eventHubRuntimeInfo = await client.GetRuntimeInformationAsync();
PartitionReceiver partitionReceiver;
// Get an IoT Hub partition ID that corresponds to this partition's low key.
// This assumes that this service has a partition count 'n' that is equal to the IoT Hub partition count and a partition range of 0..n-1.
// For example, given an IoT Hub with 32 partitions, this service should be created with:
// partition count = 32
// partition range = 0..31
string eventHubPartitionId = eventHubRuntimeInfo.PartitionIds[servicePartitionKey];
using (var tx = this.StateManager.CreateTransaction())
{
ConditionalValue <string> offsetResult = await offsetDictionary.TryGetValueAsync(tx, "offset", LockMode.Default);
ConditionalValue <long> epochResult = await epochDictionary.TryGetValueAsync(tx, "epoch", LockMode.Update);
long newEpoch = epochResult.HasValue
? epochResult.Value + 1
: 0;
if (offsetResult.HasValue)
{
// continue where the service left off before the last failover or restart.
ServiceEventSource.Current.ServiceMessage(
this.Context,
"Creating EventHub listener on partition {0} with offset {1}",
eventHubPartitionId,
offsetResult.Value);
partitionReceiver = client.CreateEpochReceiver(consumerGroup, eventHubPartitionId, EventPosition.FromOffset(offsetResult.Value), newEpoch);
}
else
{
// first time this service is running so there is no offset value yet.
// start with the current time.
ServiceEventSource.Current.ServiceMessage(
this.Context,
"Creating EventHub listener on partition {0} with offset {1}",
eventHubPartitionId,
DateTime.UtcNow);
partitionReceiver = client.CreateEpochReceiver(consumerGroup, eventHubPartitionId, EventPosition.FromEnqueuedTime(DateTime.UtcNow), newEpoch);
}
// epoch is recorded each time the service fails over or restarts.
await epochDictionary.SetAsync(tx, "epoch", newEpoch);
await tx.CommitAsync();
}
return(partitionReceiver);
}
public async Task PartitionReceiverEpochReceive()
{
TestUtility.Log("Testing EpochReceiver semantics");
await using (var scope = await EventHubScope.CreateAsync(2))
{
var connectionString = TestUtility.BuildEventHubsConnectionString(scope.EventHubName);
var ehClient = EventHubClient.CreateFromConnectionString(connectionString);
var epochReceiver1 = ehClient.CreateEpochReceiver(PartitionReceiver.DefaultConsumerGroupName, "1", EventPosition.FromStart(), 1);
var epochReceiver2 = ehClient.CreateEpochReceiver(PartitionReceiver.DefaultConsumerGroupName, "1", EventPosition.FromStart(), 2);
try
{
// Read the events from Epoch 1 Receiver until we're at the end of the stream
TestUtility.Log("Starting epoch 1 receiver");
IEnumerable <EventData> events;
do
{
events = await epochReceiver1.ReceiveAsync(10);
var count = events?.Count() ?? 0;
}while (events != null);
TestUtility.Log("Starting epoch 2 receiver");
var epoch2ReceiveTask = epochReceiver2.ReceiveAsync(10);
DateTime stopTime = DateTime.UtcNow.AddSeconds(30);
do
{
events = await epochReceiver1.ReceiveAsync(10);
var count = events?.Count() ?? 0;
TestUtility.Log($"Epoch 1 receiver got {count} event(s)");
}while (DateTime.UtcNow < stopTime);
throw new InvalidOperationException("Epoch 1 receiver should have encountered an exception by now!");
}
catch (ReceiverDisconnectedException disconnectedException)
{
TestUtility.Log($"Received expected exception {disconnectedException.GetType()}: {disconnectedException.Message}");
try
{
await epochReceiver1.ReceiveAsync(10);
throw new InvalidOperationException("Epoch 1 receiver should throw ReceiverDisconnectedException here too!");
}
catch (ReceiverDisconnectedException e)
{
TestUtility.Log($"Received expected exception {e.GetType()}");
}
}
finally
{
await Task.WhenAll(
epochReceiver1.CloseAsync(),
epochReceiver2.CloseAsync(),
ehClient.CloseAsync());
}
}
}
/// <summary>
/// Creates a new Checkpoint for a particular partition ID.
/// </summary>
/// <param name="partitionId">The partition ID for the checkpoint</param>
public Checkpoint(string partitionId)
: this(partitionId, EventPosition.FromStart().Offset, 0)
{
}
public async Task CreateEpochReceiverAfterNonEpochReceiver()
{
await using (var scope = await EventHubScope.CreateAsync(2))
{
var connectionString = TestUtility.BuildEventHubsConnectionString(scope.EventHubName);
var ehClient = EventHubClient.CreateFromConnectionString(connectionString);
var nonEpochReceiver = ehClient.CreateReceiver(PartitionReceiver.DefaultConsumerGroupName, "1", EventPosition.FromStart());
var epochReceiver = ehClient.CreateEpochReceiver(PartitionReceiver.DefaultConsumerGroupName, "1", EventPosition.FromStart(), 1);
try
{
TestUtility.Log("Starting nonepoch receiver");
await nonEpochReceiver.ReceiveAsync(10);
await Task.Delay(TimeSpan.FromSeconds(10));
TestUtility.Log("Starting epoch receiver");
await epochReceiver.ReceiveAsync(10);
await Task.Delay(TimeSpan.FromSeconds(10));
try
{
TestUtility.Log("Restarting nonepoch receiver, this should fail");
await nonEpochReceiver.ReceiveAsync(10);
throw new InvalidOperationException("Non-Epoch receiver should have encountered an exception by now!");
}
catch (ReceiverDisconnectedException ex) when(ex.Message.Contains("non-epoch receiver is not allowed"))
{
TestUtility.Log($"Received expected exception {ex.GetType()}: {ex.Message}");
}
}
finally
{
await Task.WhenAll(
epochReceiver.CloseAsync(),
nonEpochReceiver.CloseAsync(),
ehClient.CloseAsync());
}
}
}
public async Task CreateReceiverWithInclusiveSequenceNumber()
{
var receiver = default(PartitionReceiver);
await using (var scope = await EventHubScope.CreateAsync(1))
{
var connectionString = TestUtility.BuildEventHubsConnectionString(scope.EventHubName);
var ehClient = EventHubClient.CreateFromConnectionString(connectionString);
try
{
// Randomly pick one of the available partitons.
var partitions = await this.GetPartitionsAsync(ehClient);
var partitionId = partitions[new Random().Next(partitions.Length)];
TestUtility.Log($"Randomly picked partition {partitionId}");
await TestUtility.SendToPartitionAsync(ehClient, partitionId, $"{partitionId} event.");
// Find out where to start reading on the partition.
var pInfo = await ehClient.GetPartitionRuntimeInformationAsync(partitionId);
// Send a message which is expected to go to the end of stream.
// We are expecting to receive this message as well.
await TestUtility.SendToPartitionAsync(ehClient, partitionId, $"{partitionId} event.");
// Create a new receiver which will start reading from the last message on the stream.
TestUtility.Log($"Creating a new receiver with sequence number {pInfo.LastEnqueuedSequenceNumber}");
receiver = ehClient.CreateReceiver(PartitionReceiver.DefaultConsumerGroupName, partitionId, EventPosition.FromSequenceNumber(pInfo.LastEnqueuedSequenceNumber, true));
var receivedMessages = await receiver.ReceiveAsync(100);
// We should have received only 1 message from this call.
Assert.True(receivedMessages.Count() == 2, $"Didn't receive 2 messages. Received {receivedMessages.Count()} messages(s).");
// Next receive on this partition shouldn't return any more messages.
receivedMessages = await receiver.ReceiveAsync(100, TimeSpan.FromSeconds(15));
Assert.True(receivedMessages == null, $"Received messages at the end.");
}
finally
{
await Task.WhenAll(
receiver.CloseAsync(),
ehClient.CloseAsync());
}
}
}
private void DeliverLastCommitPosition(EventPosition lastPosition)
{
if (_stopOnEof)
return;
_publisher.Publish(
new ProjectionCoreServiceMessage.CommittedEventDistributed(
_distibutionPointCorrelationId, default(EventPosition), null, int.MinValue,
null, int.MinValue, false, null, lastPosition.PreparePosition, 100.0f)); //TODO: check was is passed here
}
public async Task CloseSenderClient()
{
var ehClient = EventHubClient.CreateFromConnectionString(TestUtility.EventHubsConnectionString);
var pSender = ehClient.CreatePartitionSender("0");
var pReceiver = ehClient.CreateReceiver(PartitionReceiver.DefaultConsumerGroupName, "0", EventPosition.FromStart());
try
{
TestUtility.Log("Sending single event to partition 0");
using (var eventData = new EventData(Encoding.UTF8.GetBytes("Hello EventHub!")))
{
await pSender.SendAsync(eventData);
TestUtility.Log("Closing partition sender");
await pSender.CloseAsync();
}
await Assert.ThrowsAsync <ObjectDisposedException>(async() =>
{
TestUtility.Log("Sending another event to partition 0 on the closed sender, this should fail");
using (var eventData = new EventData(Encoding.UTF8.GetBytes("Hello EventHub!")))
{
await pSender.SendAsync(eventData);
}
});
}
finally
{
await Task.WhenAll(
pReceiver.CloseAsync(),
ehClient.CloseAsync());
}
}
private void ValidateEventOrder(ProjectionCoreServiceMessage.CommittedEventDistributed message)
{
if (_lastEventPosition >= message.Position)
throw new InvalidOperationException(
string.Format(
"Invalid committed event order. Last: '{0}' Received: '{1}'", _lastEventPosition,
message.Position));
_lastEventPosition = message.Position;
}
public bool ProcessEvent(
EventPosition position, string streamId, string eventType, string category, Guid eventId, int sequenceNumber,
string metadata, string data, out string newState, out EmittedEvent[] emittedEvents)
{
if (_failOnProcessEvent)
throw new Exception("PROCESS_EVENT_FAILED");
_lastProcessedStreamId = streamId;
_lastProcessedEventType = eventType;
_lastProcessedEventId = eventId;
_lastProcessedSequencenumber = sequenceNumber;
_lastProcessedMetadata = metadata;
_lastProcessedData = data;
_eventsProcessed++;
switch (eventType)
{
case "skip_this_type":
_loadedState = newState = null;
emittedEvents = null;
return false;
case "handle_this_type":
_loadedState = newState = data;
emittedEvents = null;
return true;
case "append":
_loadedState = newState = _loadedState + data;
emittedEvents = null;
return true;
case "no_state_emit1_type":
_loadedState = newState = "";
emittedEvents = new[]
{new EmittedEvent(_emit1StreamId, Guid.NewGuid(), _emit1EventType, _emit1Data),};
return true;
case "emit1_type":
_loadedState = newState = data;
emittedEvents = new[]
{new EmittedEvent(_emit1StreamId, Guid.NewGuid(), _emit1EventType, _emit1Data),};
return true;
case "emit22_type":
_loadedState = newState = data;
emittedEvents = new[]
{
new EmittedEvent(_emit2StreamId, Guid.NewGuid(), _emit2EventType, _emit1Data),
new EmittedEvent(_emit2StreamId, Guid.NewGuid(), _emit2EventType, _emit2Data),
};
return true;
case "emit212_type":
_loadedState = newState = data;
emittedEvents = new[]
{
new EmittedEvent(_emit2StreamId, Guid.NewGuid(), _emit2EventType, _emit1Data),
new EmittedEvent(_emit1StreamId, Guid.NewGuid(), _emit1EventType, _emit2Data),
new EmittedEvent(_emit2StreamId, Guid.NewGuid(), _emit2EventType, _emit3Data),
};
return true;
case "emit12_type":
_loadedState = newState = data;
emittedEvents = new[]
{
new EmittedEvent(_emit1StreamId, Guid.NewGuid(), _emit1EventType, _emit1Data),
new EmittedEvent(_emit2StreamId, Guid.NewGuid(), _emit2EventType, _emit2Data),
};
return true;
default:
throw new NotSupportedException();
}
}
private void CacheRecentMessage(ProjectionMessage.Projections.CommittedEventReceived message)
{
_lastMessages.Enqueue(message);
if (_lastMessages.Count > _eventCacheSize)
{
_lastMessages.Dequeue();
}
var lastAvailableCommittedevent = _lastMessages.Peek();
_subscribeFromPosition = lastAvailableCommittedevent.Position;
}
public void ConstructorRequiresTheOptions()
{
Assert.That(() => new AmqpEventHubConsumer("theMostAwesomeHubEvar", "$DEFAULT", "0", EventPosition.FromOffset(1), null, Mock.Of <AmqpConnectionScope>(), Mock.Of <AmqpMessageConverter>(), Mock.Of <EventHubRetryPolicy>(), new LastEnqueuedEventProperties("hub", "0")), Throws.ArgumentNullException);
}
private CommittedEventReceived(
Guid correlationId, Guid subscriptionId, EventPosition position, CheckpointTag checkpointTag,
string positionStreamId, int positionSequenceNumber, string eventStreamId, int eventSequenceNumber,
string eventCategory, bool resolvedLinkTo, ResolvedEvent data, float progress,
long subscriptionMessageSequenceNumber)
: base(subscriptionId, checkpointTag, progress, subscriptionMessageSequenceNumber)
{
if (data == null) throw new ArgumentNullException("data");
_data = data;
_position = position;
_positionStreamId = positionStreamId;
_positionSequenceNumber = positionSequenceNumber;
_eventStreamId = eventStreamId;
_eventSequenceNumber = eventSequenceNumber;
_eventCategory = eventCategory;
_resolvedLinkTo = resolvedLinkTo;
}
public async Task CreateReceiverWithSequenceNumber()
{
var receiver = default(PartitionReceiver);
await using (var scope = await EventHubScope.CreateAsync(1))
{
var connectionString = TestUtility.BuildEventHubsConnectionString(scope.EventHubName);
var ehClient = EventHubClient.CreateFromConnectionString(connectionString);
try
{
// Randomly pick one of the available partitons.
var partitions = await this.GetPartitionsAsync(ehClient);
var partitionId = partitions[new Random().Next(partitions.Length)];
TestUtility.Log($"Randomly picked partition {partitionId}");
// Send and receive a message to identify the end of stream.
var pInfo = await ehClient.GetPartitionRuntimeInformationAsync(partitionId);
// Send a new message which is expected to go to the end of stream.
// We are expecting to receive only this message.
var eventSent = new EventData(new byte[1]);
eventSent.Properties["stamp"] = Guid.NewGuid().ToString();
await ehClient.CreatePartitionSender(partitionId).SendAsync(eventSent);
// Create a new receiver which will start reading from the last message on the stream.
TestUtility.Log($"Creating a new receiver with sequence number {pInfo.LastEnqueuedSequenceNumber}");
receiver = ehClient.CreateReceiver(PartitionReceiver.DefaultConsumerGroupName, partitionId, EventPosition.FromSequenceNumber(pInfo.LastEnqueuedSequenceNumber));
var receivedMessages = await receiver.ReceiveAsync(100);
// We should have received only 1 message from this call.
Assert.True(receivedMessages.Count() == 1, $"Didn't receive 1 message. Received {receivedMessages.Count()} messages(s).");
// Check stamp.
Assert.True(receivedMessages.Single().Properties["stamp"].ToString() == eventSent.Properties["stamp"].ToString()
, "Stamps didn't match on the message sent and received!");
TestUtility.Log("Received correct message as expected.");
// Next receive on this partition shouldn't return any more messages.
receivedMessages = await receiver.ReceiveAsync(100, TimeSpan.FromSeconds(15));
Assert.True(receivedMessages == null, $"Received messages at the end.");
}
finally
{
await Task.WhenAll(
receiver.CloseAsync(),
ehClient.CloseAsync());
}
}
}
private CommittedEventReceived(
Guid correlationId, Guid subscriptionId, EventPosition position, string eventStreamId,
int eventSequenceNumber, string eventCategory, bool resolvedLinkTo, ResolvedEvent data, float progress,
long subscriptionMessageSequenceNumber)
: this(
correlationId, subscriptionId, position,
CheckpointTag.FromPosition(position.CommitPosition, position.PreparePosition), eventStreamId,
eventSequenceNumber, eventStreamId, eventSequenceNumber, eventCategory, resolvedLinkTo, data,
progress, subscriptionMessageSequenceNumber)
{
}
public async Task PartitionReceiverReceiveBatch()
{
const int MaxBatchSize = 5;
TestUtility.Log("Receiving Events via PartitionReceiver.ReceiveAsync(BatchSize)");
const string partitionId = "0";
await using (var scope = await EventHubScope.CreateAsync(1))
{
var connectionString = TestUtility.BuildEventHubsConnectionString(scope.EventHubName);
var ehClient = EventHubClient.CreateFromConnectionString(connectionString);
var partitionSender = ehClient.CreatePartitionSender(partitionId);
var partitionReceiver = ehClient.CreateReceiver(PartitionReceiver.DefaultConsumerGroupName, partitionId, EventPosition.FromEnqueuedTime(DateTime.UtcNow.AddMinutes(-10)));
try
{
int eventCount = 20;
TestUtility.Log($"Sending {eventCount} events to Partition {partitionId}");
var sendEvents = new List <EventData>(eventCount);
for (int i = 0; i < eventCount; i++)
{
sendEvents.Add(new EventData(Encoding.UTF8.GetBytes($"Hello EventHub! Message {i}")));
}
await partitionSender.SendAsync(sendEvents);
int maxReceivedBatchSize = 0;
while (true)
{
IEnumerable <EventData> partition1Events = await partitionReceiver.ReceiveAsync(MaxBatchSize);
int receivedEventCount = partition1Events != null?partition1Events.Count() : 0;
TestUtility.Log($"Received {receivedEventCount} event(s)");
if (partition1Events == null)
{
break;
}
maxReceivedBatchSize = Math.Max(maxReceivedBatchSize, receivedEventCount);
}
Assert.True(maxReceivedBatchSize == MaxBatchSize, $"A max batch size of {MaxBatchSize} events was not honored! Actual {maxReceivedBatchSize}.");
}
finally
{
await Task.WhenAll(
partitionReceiver.CloseAsync(),
partitionSender.CloseAsync(),
ehClient.CloseAsync());
}
}
}
public static CommittedEventReceived Sample(
Guid correlationId, Guid subscriptionId, EventPosition position, string eventStreamId,
int eventSequenceNumber, bool resolvedLinkTo, ResolvedEvent data, long subscriptionMessageSequenceNumber)
{
return new CommittedEventReceived(
correlationId, subscriptionId, position, eventStreamId, eventSequenceNumber, null, resolvedLinkTo, data, 77.7f,
subscriptionMessageSequenceNumber);
}
public async Task CreateReceiverWithEndOfStream()
{
var receiver = default(PartitionReceiver);
var partitionSender = default(PartitionSender);
await using (var scope = await EventHubScope.CreateAsync(1))
{
var connectionString = TestUtility.BuildEventHubsConnectionString(scope.EventHubName);
var ehClient = EventHubClient.CreateFromConnectionString(connectionString);
try
{
// Randomly pick one of the available partitons.
var partitions = await this.GetPartitionsAsync(ehClient);
var partitionId = partitions[new Random().Next(partitions.Length)];
TestUtility.Log($"Randomly picked partition {partitionId}");
partitionSender = ehClient.CreatePartitionSender(partitionId);
// Send couple of messages before creating an EndOfStream receiver.
// We are not expecting to receive these messages would be sent before receiver creation.
for (int i = 0; i < 10; i++)
{
var ed = new EventData(new byte[1]);
await partitionSender.SendAsync(ed);
}
// Create a new receiver which will start reading from the end of the stream.
TestUtility.Log($"Creating a new receiver with offset EndOFStream");
receiver = ehClient.CreateReceiver(PartitionReceiver.DefaultConsumerGroupName, partitionId, EventPosition.FromEnd());
// Attemp to receive the message. This should return only 1 message.
var receiveTask = receiver.ReceiveAsync(100);
// Send a new message which is expected to go to the end of stream.
// We are expecting to receive only this message.
// Wait 5 seconds before sending to avoid race.
await Task.Delay(5000);
var eventToReceive = new EventData(new byte[1]);
eventToReceive.Properties["stamp"] = Guid.NewGuid().ToString();
await partitionSender.SendAsync(eventToReceive);
// Complete asyncy receive task.
var receivedMessages = await receiveTask;
// We should have received only 1 message from this call.
Assert.True(receivedMessages.Count() == 1, $"Didn't receive 1 message. Received {receivedMessages.Count()} messages(s).");
// Check stamp.
Assert.True(receivedMessages.Single().Properties["stamp"].ToString() == eventToReceive.Properties["stamp"].ToString()
, "Stamps didn't match on the message sent and received!");
TestUtility.Log("Received correct message as expected.");
// Next receive on this partition shouldn't return any more messages.
receivedMessages = await receiver.ReceiveAsync(100, TimeSpan.FromSeconds(15));
Assert.True(receivedMessages == null, $"Received messages at the end.");
}
finally
{
await Task.WhenAll(
partitionSender.CloseAsync(),
receiver.CloseAsync(),
ehClient.CloseAsync());
}
}
}
public bool IsCheckpointTagAfterEventPosition(CheckpointTag checkpointTag, EventPosition position)
{
if (_streams == null || _streams.Count == 0)
{
return checkpointTag.Position >= position;
}
else if (_streams != null && _streams.Count == 1)
{
return checkpointTag.PreparePosition >= position.CommitPosition;
}
else if (_categories != null && _categories.Count == 1)
{
return checkpointTag.PreparePosition >= position.CommitPosition;
}
else
throw new NotSupportedException();
}
public async Task CloseReceiverClient()
{
await using (var scope = await EventHubScope.CreateAsync(1))
{
var connectionString = TestUtility.BuildEventHubsConnectionString(scope.EventHubName);
var ehClient = EventHubClient.CreateFromConnectionString(connectionString);
var pSender = ehClient.CreatePartitionSender("0");
var pReceiver = ehClient.CreateReceiver(PartitionReceiver.DefaultConsumerGroupName, "0", EventPosition.FromStart());
try
{
TestUtility.Log("Sending single event to partition 0");
var eventData = new EventData(Encoding.UTF8.GetBytes("Hello EventHub!"));
await pSender.SendAsync(eventData);
TestUtility.Log("Receiving the event.");
var events = await pReceiver.ReceiveAsync(1);
Assert.True(events != null && events.Count() == 1, "Failed to receive 1 event");
}
finally
{
TestUtility.Log("Closing partition receiver");
await Task.WhenAll(
pReceiver.CloseAsync(),
ehClient.CloseAsync());
}
await Assert.ThrowsAsync <ObjectDisposedException>(async() =>
{
TestUtility.Log("Receiving another event from partition 0 on the closed receiver, this should fail");
await pReceiver.ReceiveAsync(1);
});
}
}
/// <summary>
/// Starts running a task responsible for receiving and processing events in the context of a specified partition.
/// </summary>
///
/// <param name="partitionId">The identifier of the Event Hub partition the task is associated with. Events will be read only from this partition.</param>
/// <param name="startingPosition">The position within the partition where the task should begin reading events.</param>
/// <param name="maximumReceiveWaitTime">The maximum amount of time to wait to for an event to be available before emitting an empty item; if <c>null</c>, empty items will not be published.</param>
/// <param name="retryOptions">The set of options to use for determining whether a failed operation should be retried and, if so, the amount of time to wait between retry attempts.</param>
/// <param name="trackLastEnqueuedEventInformation">Indicates whether or not the task should request information on the last enqueued event on the partition associated with a given event, and track that information as events are received.</param>
/// <param name="cancellationToken">An optional <see cref="CancellationToken"/> instance to signal the request to cancel the operation.</param>
///
/// <returns>The running task that is currently receiving and processing events in the context of the specified partition.</returns>
///
protected virtual Task RunPartitionProcessingAsync(string partitionId,
EventPosition startingPosition,
TimeSpan?maximumReceiveWaitTime,
RetryOptions retryOptions,
bool trackLastEnqueuedEventInformation,
CancellationToken cancellationToken = default)
{
// TODO: should the retry options used here be the same for the abstract RetryPolicy property?
Argument.AssertNotNullOrEmpty(partitionId, nameof(partitionId));
Argument.AssertNotNull(retryOptions, nameof(retryOptions));
return(Task.Run(async() =>
{
// TODO: should we double check if a previous run already exists and close it? We have a race condition. Maybe we should throw in case another task exists.
var cancellationSource = CancellationTokenSource.CreateLinkedTokenSource(cancellationToken);
var taskCancellationToken = cancellationSource.Token;
ActivePartitionProcessorTokenSources[partitionId] = cancellationSource;
// Context is set to default if operation fails. This shouldn't fail unless the user tries processing
// a partition they don't own.
PartitionContexts.TryGetValue(partitionId, out var context);
var options = new EventHubConsumerClientOptions
{
RetryOptions = retryOptions,
TrackLastEnqueuedEventInformation = trackLastEnqueuedEventInformation
};
await using var connection = CreateConnection();
await using (var consumer = new EventHubConsumerClient(ConsumerGroup, connection, options))
{
await foreach (var partitionEvent in consumer.ReadEventsFromPartitionAsync(partitionId, startingPosition, maximumReceiveWaitTime, taskCancellationToken))
{
using DiagnosticScope diagnosticScope = EventDataInstrumentation.ClientDiagnostics.CreateScope(DiagnosticProperty.EventProcessorProcessingActivityName);
diagnosticScope.AddAttribute("kind", "server");
if (diagnosticScope.IsEnabled &&
partitionEvent.Data != null &&
EventDataInstrumentation.TryExtractDiagnosticId(partitionEvent.Data, out string diagnosticId))
{
diagnosticScope.AddLink(diagnosticId);
}
diagnosticScope.Start();
try
{
await ProcessEventAsync(partitionEvent, context).ConfigureAwait(false);
}
catch (Exception eventProcessingException)
{
diagnosticScope.Failed(eventProcessingException);
throw;
}
}
}
}));
}
public void InitializeHandlerArgs()
{
#region Snippet:EventHubs_Processor_Sample03_InitializeHandlerArgs
#if SNIPPET
var storageConnectionString = "<< CONNECTION STRING FOR THE STORAGE ACCOUNT >>";
var blobContainerName = "<< NAME OF THE BLOB CONTAINER >>";
var eventHubsConnectionString = "<< CONNECTION STRING FOR THE EVENT HUBS NAMESPACE >>";
var eventHubName = "<< NAME OF THE EVENT HUB >>";
var consumerGroup = "<< NAME OF THE EVENT HUB CONSUMER GROUP >>";
#else
var storageConnectionString = StorageTestEnvironment.Instance.StorageConnectionString;
var blobContainerName = "not-real";
var eventHubsConnectionString = EventHubsTestEnvironment.Instance.EventHubsConnectionString;
var eventHubName = "fakeHub";
var consumerGroup = "fakeConsumer";
#endif
var storageClient = new BlobContainerClient(
storageConnectionString,
blobContainerName);
var processor = new EventProcessorClient(
storageClient,
consumerGroup,
eventHubsConnectionString,
eventHubName);
Task initializeEventHandler(PartitionInitializingEventArgs args)
{
try
{
if (args.CancellationToken.IsCancellationRequested)
{
return(Task.CompletedTask);
}
Debug.WriteLine($"Initialize partition: { args.PartitionId }");
// If no checkpoint was found, start processing
// events enqueued now or in the future.
EventPosition startPositionWhenNoCheckpoint =
EventPosition.FromEnqueuedTime(DateTimeOffset.UtcNow);
args.DefaultStartingPosition = startPositionWhenNoCheckpoint;
}
catch
{
// Take action to handle the exception.
// It is important that all exceptions are
// handled and none are permitted to bubble up.
}
return(Task.CompletedTask);
}
try
{
processor.PartitionInitializingAsync += initializeEventHandler;
// Starting and stopping the processor are not
// shown in this example.
}
finally
{
processor.PartitionInitializingAsync -= initializeEventHandler;
}
#endregion
}
private Task <PartitionReceiver> SetupFromEndOfStreamAsync(string consumerGroup, string partitionId)
{
return(Task.FromResult(_client.CreateReceiver(consumerGroup, partitionId, EventPosition.FromEnd())));
}
/// <summary>
/// Initializes a new instance of the type
/// </summary>
/// <param name="containerName">The name of the container to use in logging operations</param>
/// <param name="diagnosticsConfiguration">A diagnostics instance to use when instantiating the container</param>
/// <param name="probeConfiguration">The availability and liveness probe configuration</param>
/// <param name="startPosition">The event position to start processing if no checkpoint is found for the partition</param>
protected LegacyProcessorBase(string containerName, DiagnosticsConfiguration diagnosticsConfiguration, IProbeConfiguration probeConfiguration, EventPosition startPosition) : base(containerName, probeConfiguration, diagnosticsConfiguration)
{
_loggerFactory = diagnosticsConfiguration.LoggerFactory;
_startPosition = startPosition;
_iterationCounter = diagnosticsConfiguration.MetricFactory.CreateCounter("pro_iteration_counter", "Counts the number of iterations the demo container has performed.", false, new string[0]);
_scaleEventCounter = diagnosticsConfiguration.MetricFactory.CreateCounter("pro_scale_event_counter", "Counts the number of times a scale event has occurred.", false, new string[0]);
_healthProbeCounter = diagnosticsConfiguration.MetricFactory.CreateCounter("pro_health_counter", "Counts the number of times the liveness probe endpoint has been accessed since the start of the container.", false, new string[0]);
_healthProbeFailureCounter = diagnosticsConfiguration.MetricFactory.CreateCounter("pro_health_failure_counter", "Counts the number of times the liveness probe endpoint has been accessed and failed since the start of the container.", false, new string[0]);
_availabilityProbeCounter = diagnosticsConfiguration.MetricFactory.CreateCounter("pro_availability_counter", "Counts the number of times the readiness probe endpoint has been accessed since the start of the container.", false, new string[0]);
_availabilityProbeFailureCounter = diagnosticsConfiguration.MetricFactory.CreateCounter("pro_availability_failure_counter", "Counts the number of times the readiness probe endpoint has been accessed and failed since the start of the container.", false, new string[0]);
}
public async Task ReadPartitionWaitTime()
{
await using var scope = await EventHubScope.CreateAsync(1);
#region Snippet:EventHubs_Sample05_ReadPartitionWaitTime
var connectionString = "<< CONNECTION STRING FOR THE EVENT HUBS NAMESPACE >>";
var eventHubName = "<< NAME OF THE EVENT HUB >>";
var consumerGroup = EventHubConsumerClient.DefaultConsumerGroupName;
/*@@*/
/*@@*/ connectionString = EventHubsTestEnvironment.Instance.EventHubsConnectionString;
/*@@*/ eventHubName = scope.EventHubName;
var consumer = new EventHubConsumerClient(
consumerGroup,
connectionString,
eventHubName);
try
{
using CancellationTokenSource cancellationSource = new CancellationTokenSource();
cancellationSource.CancelAfter(TimeSpan.FromSeconds(30));
string firstPartition = (await consumer.GetPartitionIdsAsync(cancellationSource.Token)).First();
EventPosition startingPosition = EventPosition.Earliest;
int loopTicks = 0;
int maximumTicks = 10;
var options = new ReadEventOptions
{
MaximumWaitTime = TimeSpan.FromSeconds(1)
};
await foreach (PartitionEvent partitionEvent in consumer.ReadEventsFromPartitionAsync(
firstPartition,
startingPosition,
options))
{
if (partitionEvent.Data != null)
{
string readFromPartition = partitionEvent.Partition.PartitionId;
byte[] eventBodyBytes = partitionEvent.Data.EventBody.ToArray();
Debug.WriteLine($"Read event of length { eventBodyBytes.Length } from { readFromPartition }");
}
else
{
Debug.WriteLine("Wait time elapsed; no event was available.");
}
loopTicks++;
if (loopTicks >= maximumTicks)
{
break;
}
}
}
catch (TaskCanceledException)
{
// This is expected if the cancellation token is
// signaled.
}
finally
{
await consumer.CloseAsync();
}
#endregion
}
/// <summary>
/// Creates an AMQP link for use with receiving operations.
/// </summary>
///
/// <param name="connection">The active and opened AMQP connection to use for this link.</param>
/// <param name="endpoint">The fully qualified endpoint to open the link for.</param>
/// <param name="eventPosition">The position of the event in the partition where the link should be filtered to.</param>
/// <param name="consumerOptions">The set of active options for the consumer that will make use of the link.</param>
/// <param name="timeout">The timeout to apply when creating the link.</param>
/// <param name="cancellationToken">An optional <see cref="CancellationToken"/> instance to signal the request to cancel the operation.</param>
///
/// <returns>A link for use for operations related to receiving events.</returns>
///
protected virtual async Task <ReceivingAmqpLink> CreateReceivingLinkAsync(AmqpConnection connection,
Uri endpoint,
EventPosition eventPosition,
EventHubConsumerOptions consumerOptions,
TimeSpan timeout,
CancellationToken cancellationToken)
{
Argument.AssertNotDisposed(IsDisposed, nameof(AmqpConnectionScope));
cancellationToken.ThrowIfCancellationRequested <TaskCanceledException>();
var session = default(AmqpSession);
var stopWatch = Stopwatch.StartNew();
try
{
// Perform the initial authorization for the link.
var authClaims = new[] { EventHubsClaim.Listen };
var authExpirationUtc = await RequestAuthorizationUsingCbsAsync(connection, TokenProvider, endpoint, endpoint.AbsoluteUri, endpoint.AbsoluteUri, authClaims, timeout.CalculateRemaining(stopWatch.Elapsed)).ConfigureAwait(false);
cancellationToken.ThrowIfCancellationRequested <TaskCanceledException>();
// Create and open the AMQP session associated with the link.
var sessionSettings = new AmqpSessionSettings {
Properties = new Fields()
};
session = connection.CreateSession(sessionSettings);
await OpenAmqpObjectAsync(session, timeout).ConfigureAwait(false);
cancellationToken.ThrowIfCancellationRequested <TaskCanceledException>();
// Create and open the link.
var filters = new FilterSet();
filters.Add(AmqpFilter.ConsumerFilterName, AmqpFilter.CreateConsumerFilter(AmqpFilter.BuildFilterExpression(eventPosition)));
var linkSettings = new AmqpLinkSettings
{
Role = true,
TotalLinkCredit = (uint)consumerOptions.PrefetchCount,
AutoSendFlow = consumerOptions.PrefetchCount > 0,
SettleType = SettleMode.SettleOnSend,
Source = new Source {
Address = endpoint.AbsolutePath, FilterSet = filters
},
Target = new Target {
Address = Guid.NewGuid().ToString()
}
};
linkSettings.AddProperty(AmqpProperty.EntityType, (int)AmqpProperty.Entity.ConsumerGroup);
if (!string.IsNullOrEmpty(consumerOptions.Identifier))
{
linkSettings.AddProperty(AmqpProperty.ConsumerIdentifier, consumerOptions.Identifier);
}
if (consumerOptions.OwnerLevel.HasValue)
{
linkSettings.AddProperty(AmqpProperty.OwnerLevel, consumerOptions.OwnerLevel.Value);
}
if (consumerOptions.TrackLastEnqueuedEventInformation)
{
linkSettings.DesiredCapabilities = new Multiple <AmqpSymbol>(new List <AmqpSymbol>
{
AmqpProperty.TrackLastEnqueuedEventInformation
});
}
var link = new ReceivingAmqpLink(linkSettings);
linkSettings.LinkName = $"{ Id };{ connection.Identifier };{ session.Identifier };{ link.Identifier }";
link.AttachTo(session);
stopWatch.Stop();
// Configure refresh for authorization of the link.
var refreshTimer = default(Timer);
var refreshHandler = CreateAuthorizationRefreshHandler
(
connection,
link,
TokenProvider,
endpoint,
endpoint.AbsoluteUri,
endpoint.AbsoluteUri,
authClaims,
AuthorizationRefreshTimeout,
() => refreshTimer
);
refreshTimer = new Timer(refreshHandler, null, CalculateLinkAuthorizationRefreshInterval(authExpirationUtc), Timeout.InfiniteTimeSpan);
// Track the link before returning it, so that it can be managed with the scope.
BeginTrackingLinkAsActive(link, refreshTimer);
return(link);
}
catch
{
// Aborting the session will perform any necessary cleanup of
// the associated link as well.
session?.Abort();
throw;
}
}
public async Task EventProcessorCanReceiveFromSpecifiedInitialEventPosition()
{
await using (EventHubScope scope = await EventHubScope.CreateAsync(2))
{
var connectionString = TestEnvironment.BuildConnectionStringForEventHub(scope.EventHubName);
await using (var client = new EventHubClient(connectionString))
{
int receivedEventsCount = 0;
// Send some events.
var expectedEventsCount = 20;
var dummyEvent = new EventData(Encoding.UTF8.GetBytes("I'm dummy."));
DateTimeOffset enqueuedTime;
await using (EventHubProducer producer = client.CreateProducer())
{
// Send a few dummy events. We are not expecting to receive these.
for (int i = 0; i < 30; i++)
{
await producer.SendAsync(dummyEvent);
}
// Wait a reasonable amount of time so the events are able to reach the service.
await Task.Delay(1000);
// Send the events we expect to receive.
enqueuedTime = DateTimeOffset.UtcNow;
for (int i = 0; i < expectedEventsCount; i++)
{
await producer.SendAsync(dummyEvent);
}
}
// Create the event processor manager to manage our event processors.
var eventProcessorManager = new EventProcessorManager
(
EventHubConsumer.DefaultConsumerGroupName,
client,
options: new EventProcessorOptions {
InitialEventPosition = EventPosition.FromEnqueuedTime(enqueuedTime)
},
onProcessEvents: (partitionContext, events, cancellationToken) =>
{
// Make it a list so we can safely enumerate it.
var eventsList = new List <EventData>(events ?? Enumerable.Empty <EventData>());
if (eventsList.Count > 0)
{
Interlocked.Add(ref receivedEventsCount, eventsList.Count);
}
}
);
eventProcessorManager.AddEventProcessors(1);
// Start the event processors.
await eventProcessorManager.StartAllAsync();
// Make sure the event processors have enough time to stabilize and receive events.
await eventProcessorManager.WaitStabilization();
// Stop the event processors.
await eventProcessorManager.StopAllAsync();
// Validate results.
Assert.That(receivedEventsCount, Is.EqualTo(expectedEventsCount));
}
}
}
public bool ProcessEvent(
EventPosition position, CheckpointTag eventPosition, string streamId, string eventType, string category, Guid eventid,
int sequenceNumber, string metadata, string data, out string newState, out EmittedEvent[] emittedEvents)
{
CheckDisposed();
if (eventType == null)
throw new ArgumentNullException("eventType");
if (streamId == null)
throw new ArgumentNullException("streamId");
_eventPosition = eventPosition;
_emittedEvents = null;
_query.Push(
data.Trim(), // trimming data passed to a JS
new string[] {streamId, eventType, category ?? "", sequenceNumber.ToString(CultureInfo.InvariantCulture), metadata ?? "", position.PreparePosition.ToString()});
newState = _query.GetState();
emittedEvents = _emittedEvents == null ? null : _emittedEvents.ToArray();
return true;
}
public bool CanJoinAt(EventPosition firstAvailableTransactionFileEvent, CheckpointTag eventCheckpointTag)
{
return eventCheckpointTag.PreparePosition >= firstAvailableTransactionFileEvent.CommitPosition;
}
