private async Task <bool> ErrorProtocol(StreamConsumerData consumerData, Exception exceptionOccured, bool isDeliveryError, IBatchContainer batch, StreamSequenceToken token)
{
// for loss of client, we just remove the subscription
if (exceptionOccured is ClientNotAvailableException)
{
logger.LogWarning(
(int)ErrorCode.Stream_ConsumerIsDead,
"Consumer {Consumer} on stream {StreamId} is no longer active - permanently removing Consumer.",
consumerData.StreamConsumer,
consumerData.StreamId);
pubSub.UnregisterConsumer(consumerData.SubscriptionId, consumerData.StreamId).Ignore();
return(true);
}
// notify consumer about the error or that the data is not available.
await OrleansTaskExtentions.ExecuteAndIgnoreException(
() => DeliverErrorToConsumer(
consumerData, exceptionOccured, batch));
// record that there was a delivery failure
if (isDeliveryError)
{
await OrleansTaskExtentions.ExecuteAndIgnoreException(
() => streamFailureHandler.OnDeliveryFailure(
consumerData.SubscriptionId, streamProviderName, consumerData.StreamId, token));
}
else
{
await OrleansTaskExtentions.ExecuteAndIgnoreException(
() => streamFailureHandler.OnSubscriptionFailure(
consumerData.SubscriptionId, streamProviderName, consumerData.StreamId, token));
}
// if configured to fault on delivery failure and this is not an implicit subscription, fault and remove the subscription
if (streamFailureHandler.ShouldFaultSubsriptionOnError && !SubscriptionMarker.IsImplicitSubscription(consumerData.SubscriptionId.Guid))
{
try
{
// notify consumer of faulted subscription, if we can.
await OrleansTaskExtentions.ExecuteAndIgnoreException(
() => DeliverErrorToConsumer(
consumerData, new FaultedSubscriptionException(consumerData.SubscriptionId, consumerData.StreamId), batch));
// mark subscription as faulted.
await pubSub.FaultSubscription(consumerData.StreamId, consumerData.SubscriptionId);
}
finally
{
// remove subscription
RemoveSubscriber_Impl(consumerData.SubscriptionId, consumerData.StreamId);
}
return(true);
}
return(false);
}
private async Task <bool> ErrorProtocol(StreamConsumerData consumerData, Exception exceptionOccured, bool isDeliveryError, IBatchContainer batch, StreamSequenceToken token)
{
// notify consumer about the error or that the data is not available.
await OrleansTaskExtentions.ExecuteAndIgnoreException(
() => DeliverErrorToConsumer(
consumerData, exceptionOccured, batch));
// record that there was a delivery failure
if (isDeliveryError)
{
await OrleansTaskExtentions.ExecuteAndIgnoreException(
() => streamFailureHandler.OnDeliveryFailure(
consumerData.SubscriptionId, streamProviderName, consumerData.StreamId, token));
}
else
{
await OrleansTaskExtentions.ExecuteAndIgnoreException(
() => streamFailureHandler.OnSubscriptionFailure(
consumerData.SubscriptionId, streamProviderName, consumerData.StreamId, token));
}
// if configured to fault on delivery failure and this is not an implicit subscription, fault and remove the subscription
if (streamFailureHandler.ShouldFaultSubsriptionOnError && !SubscriptionMarker.IsImplicitSubscription(consumerData.SubscriptionId.Guid))
{
try
{
// notify consumer of faulted subscription, if we can.
await OrleansTaskExtentions.ExecuteAndIgnoreException(
() => DeliverErrorToConsumer(
consumerData, new FaultedSubscriptionException(consumerData.SubscriptionId, consumerData.StreamId), batch));
// mark subscription as faulted.
await pubSub.FaultSubscription(consumerData.StreamId, consumerData.SubscriptionId);
}
finally
{
// remove subscription
RemoveSubscriber_Impl(consumerData.SubscriptionId, consumerData.StreamId);
}
return(true);
}
return(false);
}
// Called by rendezvous when new remote subscriber subscribes to this stream.
private async Task AddSubscriber_Impl(
GuidId subscriptionId,
StreamId streamId,
IStreamConsumerExtension streamConsumer,
StreamSequenceToken token,
IStreamFilterPredicateWrapper filter)
{
IQueueCacheCursor cursor = null;
StreamSequenceToken requestedToken = null;
// if not cache, then we can't get cursor and there is no reason to ask consumer for token.
if (queueCache != null)
{
DataNotAvailableException errorOccured = null;
try
{
requestedToken = await streamConsumer.GetSequenceToken(subscriptionId);
// Set cursor if not cursor is set, or if subscription provides new token
requestedToken = requestedToken ?? token;
if (requestedToken != null)
{
cursor = queueCache.GetCacheCursor(streamId.Guid, streamId.Namespace, requestedToken);
}
}
catch (DataNotAvailableException dataNotAvailableException)
{
errorOccured = dataNotAvailableException;
}
if (errorOccured != null)
{
// notify consumer that the data is not available, if we can.
await OrleansTaskExtentions.ExecuteAndIgnoreException(() => streamConsumer.ErrorInStream(subscriptionId, errorOccured));
}
}
AddSubscriberToSubscriptionCache(subscriptionId, streamId, streamConsumer, cursor, requestedToken, filter);
}
private async Task RunConsumerCursor(StreamConsumerData consumerData, IStreamFilterPredicateWrapper filterWrapper)
{
try
{
// double check in case of interleaving
if (consumerData.State == StreamConsumerDataState.Active ||
consumerData.Cursor == null)
{
return;
}
consumerData.State = StreamConsumerDataState.Active;
while (consumerData.Cursor != null && consumerData.Cursor.MoveNext())
{
IBatchContainer batch = null;
Exception ex;
Task deliveryTask;
bool deliveryFailed = false;
try
{
batch = consumerData.Cursor.GetCurrent(out ex);
}
catch (DataNotAvailableException dataNotAvailable)
{
ex = dataNotAvailable;
}
// Apply filtering to this batch, if applicable
if (filterWrapper != null && batch != null)
{
try
{
// Apply batch filter to this input batch, to see whether we should deliver it to this consumer.
if (!batch.ShouldDeliver(
consumerData.StreamId,
filterWrapper.FilterData,
filterWrapper.ShouldReceive))
{
continue; // Skip this batch -- nothing to do
}
}
catch (Exception exc)
{
var message = string.Format("Ignoring exception while trying to evaluate subscription filter function {0} on stream {1} in PersistentStreamPullingAgentGrain.RunConsumerCursor", filterWrapper, consumerData.StreamId);
logger.Warn((int)ErrorCode.PersistentStreamPullingAgent_13, message, exc);
}
}
if (batch != null)
{
deliveryTask = AsyncExecutorWithRetries.ExecuteWithRetries(i => DeliverBatchToConsumer(consumerData, batch),
AsyncExecutorWithRetries.INFINITE_RETRIES, (exception, i) => !(exception is DataNotAvailableException), config.MaxEventDeliveryTime, DefaultBackoffProvider);
}
else if (ex == null)
{
deliveryTask = consumerData.StreamConsumer.CompleteStream(consumerData.SubscriptionId);
}
else
{
// If data is not avialable, bring cursor current
if (ex is DataNotAvailableException)
{
consumerData.Cursor = queueCache.GetCacheCursor(consumerData.StreamId.Guid,
consumerData.StreamId.Namespace, null);
}
// Notify client of error.
deliveryTask = DeliverErrorToConsumer(consumerData, ex, null);
}
try
{
numSentMessagesCounter.Increment();
await deliveryTask;
}
catch (Exception exc)
{
var message = string.Format("Exception while trying to deliver msgs to stream {0} in PersistentStreamPullingAgentGrain.RunConsumerCursor", consumerData.StreamId);
logger.Error((int)ErrorCode.PersistentStreamPullingAgent_14, message, exc);
deliveryFailed = true;
}
// if we failed to deliver a batch
if (deliveryFailed && batch != null)
{
// notify consumer of delivery error, if we can.
await OrleansTaskExtentions.ExecuteAndIgnoreException(() => DeliverErrorToConsumer(consumerData, new StreamEventDeliveryFailureException(consumerData.StreamId), batch));
// record that there was a delivery failure
await streamFailureHandler.OnDeliveryFailure(consumerData.SubscriptionId, streamProviderName,
consumerData.StreamId, batch.SequenceToken);
// if configured to fault on delivery failure and this is not an implicit subscription, fault and remove the subscription
if (streamFailureHandler.ShouldFaultSubsriptionOnError && !SubscriptionMarker.IsImplicitSubscription(consumerData.SubscriptionId.Guid))
{
try
{
// notify consumer of faulted subscription, if we can.
DeliverErrorToConsumer(consumerData,
new FaultedSubscriptionException(consumerData.SubscriptionId, consumerData.StreamId), batch)
.Ignore();
// mark subscription as faulted.
await pubSub.FaultSubscription(consumerData.StreamId, consumerData.SubscriptionId);
}
finally
{
// remove subscription
RemoveSubscriber_Impl(consumerData.SubscriptionId, consumerData.StreamId);
}
return;
}
}
}
consumerData.State = StreamConsumerDataState.Inactive;
}
catch (Exception exc)
{
// RunConsumerCursor is fired with .Ignore so we should log if anything goes wrong, because there is no one to catch the exception
logger.Error((int)ErrorCode.PersistentStreamPullingAgent_15, "Ignored RunConsumerCursor Error", exc);
throw;
}
}
