private async Task<bool> DoHandshakeWithConsumer(
StreamConsumerData consumerData,
StreamSequenceToken cacheToken)
{
StreamHandshakeToken requestedHandshakeToken = null;
// if not cache, then we can't get cursor and there is no reason to ask consumer for token.
if (queueCache != null)
{
Exception exceptionOccured = null;
try
{
requestedHandshakeToken = await AsyncExecutorWithRetries.ExecuteWithRetries(
i => consumerData.StreamConsumer.GetSequenceToken(consumerData.SubscriptionId),
AsyncExecutorWithRetries.INFINITE_RETRIES,
(exception, i) => true,
config.MaxEventDeliveryTime,
DefaultBackoffProvider);
if (requestedHandshakeToken != null)
{
consumerData.SafeDisposeCursor(logger);
consumerData.Cursor = queueCache.GetCacheCursor(consumerData.StreamId, requestedHandshakeToken.Token);
}
else
{
if (consumerData.Cursor == null) // if the consumer did not ask for a specific token and we already have a cursor, jsut keep using it.
consumerData.Cursor = queueCache.GetCacheCursor(consumerData.StreamId, cacheToken);
}
}
catch (Exception exception)
{
exceptionOccured = exception;
}
if (exceptionOccured != null)
{
bool faultedSubscription = await ErrorProtocol(consumerData, exceptionOccured, false, null, requestedHandshakeToken != null ? requestedHandshakeToken.Token : null);
if (faultedSubscription) return false;
}
}
consumerData.LastToken = requestedHandshakeToken; // use what ever the consumer asked for as LastToken for next handshake (even if he asked for null).
// if we don't yet have a cursor (had errors in the handshake or data not available exc), get a cursor at the event that triggered that consumer subscription.
if (consumerData.Cursor == null && queueCache != null)
{
try
{
consumerData.Cursor = queueCache.GetCacheCursor(consumerData.StreamId, cacheToken);
}
catch (Exception)
{
consumerData.Cursor = queueCache.GetCacheCursor(consumerData.StreamId, null); // just in case last GetCacheCursor failed.
}
}
return true;
}
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)
{
IBatchContainer batch = null;
Exception exceptionOccured = null;
try
{
Exception ignore;
if (!consumerData.Cursor.MoveNext())
{
break;
}
batch = consumerData.Cursor.GetCurrent(out ignore);
}
catch (Exception exc)
{
exceptionOccured = exc;
consumerData.SafeDisposeCursor(logger);
consumerData.Cursor = queueCache.GetCacheCursor(consumerData.StreamId, null);
}
// 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 =
$"Ignoring exception while trying to evaluate subscription filter function {filterWrapper} on stream {consumerData.StreamId} in PersistentStreamPullingAgentGrain.RunConsumerCursor";
logger.Warn((int)ErrorCode.PersistentStreamPullingAgent_13, message, exc);
}
}
try
{
numSentMessagesCounter.Increment();
if (batch != null)
{
StreamHandshakeToken newToken = await AsyncExecutorWithRetries.ExecuteWithRetries(
i => DeliverBatchToConsumer(consumerData, batch),
AsyncExecutorWithRetries.INFINITE_RETRIES,
(exception, i) => !(exception is ClientNotAvailableException),
config.MaxEventDeliveryTime,
DeliveryBackoffProvider);
if (newToken != null)
{
consumerData.LastToken = newToken;
IQueueCacheCursor newCursor = queueCache.GetCacheCursor(consumerData.StreamId, newToken.Token);
consumerData.SafeDisposeCursor(logger);
consumerData.Cursor = newCursor;
}
}
}
catch (Exception exc)
{
consumerData.Cursor?.RecordDeliveryFailure();
var message =
$"Exception while trying to deliver msgs to stream {consumerData.StreamId} in PersistentStreamPullingAgentGrain.RunConsumerCursor";
logger.Error(ErrorCode.PersistentStreamPullingAgent_14, message, exc);
exceptionOccured = exc is ClientNotAvailableException
? exc
: new StreamEventDeliveryFailureException(consumerData.StreamId);
}
// if we failed to deliver a batch
if (exceptionOccured != null)
{
bool faultedSubscription = await ErrorProtocol(consumerData, exceptionOccured, true, batch, batch?.SequenceToken);
if (faultedSubscription)
{
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(ErrorCode.PersistentStreamPullingAgent_15, "Ignored RunConsumerCursor Error", exc);
consumerData.State = StreamConsumerDataState.Inactive;
throw;
}
}
private async Task RunConsumerCursor(StreamConsumerData consumerData)
{
try
{
// double check in case of interleaving
if (consumerData.State == StreamConsumerDataState.Active ||
consumerData.Cursor == null)
{
return;
}
consumerData.State = StreamConsumerDataState.Active;
while (consumerData.Cursor != null)
{
IBatchContainer batch = null;
Exception exceptionOccured = null;
try
{
batch = GetBatchForConsumer(consumerData.Cursor, consumerData.StreamId, consumerData.FilterData);
if (batch == null)
{
break;
}
}
catch (Exception exc)
{
exceptionOccured = exc;
consumerData.SafeDisposeCursor(logger);
consumerData.Cursor = queueCache.GetCacheCursor(consumerData.StreamId, null);
}
if (batch != null)
{
if (!ShouldDeliverBatch(consumerData.StreamId, batch, consumerData.FilterData))
{
continue;
}
}
try
{
numSentMessagesCounter.Increment();
if (batch != null)
{
StreamHandshakeToken newToken = await AsyncExecutorWithRetries.ExecuteWithRetries(
i => DeliverBatchToConsumer(consumerData, batch),
AsyncExecutorWithRetries.INFINITE_RETRIES,
(exception, i) => !(exception is ClientNotAvailableException) || IsShutdown,
this.options.MaxEventDeliveryTime,
DeliveryBackoffProvider);
if (newToken != null)
{
consumerData.LastToken = newToken;
IQueueCacheCursor newCursor = queueCache.GetCacheCursor(consumerData.StreamId, newToken.Token);
consumerData.SafeDisposeCursor(logger);
consumerData.Cursor = newCursor;
}
}
}
catch (Exception exc)
{
consumerData.Cursor?.RecordDeliveryFailure();
var message =
$"Exception while trying to deliver msgs to stream {consumerData.StreamId} in PersistentStreamPullingAgentGrain.RunConsumerCursor";
logger.Error(ErrorCode.PersistentStreamPullingAgent_14, message, exc);
exceptionOccured = exc is ClientNotAvailableException
? exc
: new StreamEventDeliveryFailureException(consumerData.StreamId);
}
// if we failed to deliver a batch
if (exceptionOccured != null)
{
bool faultedSubscription = await ErrorProtocol(consumerData, exceptionOccured, true, batch, batch?.SequenceToken);
if (faultedSubscription)
{
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(ErrorCode.PersistentStreamPullingAgent_15, "Ignored RunConsumerCursor Error", exc);
consumerData.State = StreamConsumerDataState.Inactive;
throw;
}
}
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)
{
IBatchContainer batch = null;
Exception exceptionOccured = null;
try
{
Exception ignore;
if (!consumerData.Cursor.MoveNext())
{
break;
}
batch = consumerData.Cursor.GetCurrent(out ignore);
}
catch (Exception exc)
{
exceptionOccured = exc;
consumerData.SafeDisposeCursor(logger);
consumerData.Cursor = queueCache.GetCacheCursor(consumerData.StreamId.Guid, consumerData.StreamId.Namespace, null);
}
// 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);
}
}
try
{
numSentMessagesCounter.Increment();
if (batch != null)
{
StreamHandshakeToken newToken = await AsyncExecutorWithRetries.ExecuteWithRetries(
i => DeliverBatchToConsumer(consumerData, batch),
AsyncExecutorWithRetries.INFINITE_RETRIES,
(exception, i) => true,
config.MaxEventDeliveryTime,
DefaultBackoffProvider);
if (newToken != null)
{
consumerData.LastToken = newToken;
IQueueCacheCursor newCursor = queueCache.GetCacheCursor(consumerData.StreamId.Guid,
consumerData.StreamId.Namespace, newToken.Token);
consumerData.SafeDisposeCursor(logger);
consumerData.Cursor = newCursor;
}
}
}
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);
exceptionOccured = new StreamEventDeliveryFailureException(consumerData.StreamId);
}
// if we failed to deliver a batch
if (exceptionOccured != null)
{
bool faultedSubscription = await ErrorProtocol(consumerData, exceptionOccured, true, batch, batch != null ? batch.SequenceToken : null);
if (faultedSubscription) 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);
consumerData.State = StreamConsumerDataState.Inactive;
throw;
}
}
private async Task<bool> DoHandshakeWithConsumer(
StreamConsumerData consumerData,
StreamSequenceToken cacheToken)
{
StreamHandshakeToken requestedHandshakeToken = null;
// if not cache, then we can't get cursor and there is no reason to ask consumer for token.
if (queueCache != null)
{
Exception exceptionOccured = null;
try
{
requestedHandshakeToken = await AsyncExecutorWithRetries.ExecuteWithRetries(
i => consumerData.StreamConsumer.GetSequenceToken(consumerData.SubscriptionId),
AsyncExecutorWithRetries.INFINITE_RETRIES,
(exception, i) => true,
config.MaxEventDeliveryTime,
DefaultBackoffProvider);
if (requestedHandshakeToken != null)
{
consumerData.SafeDisposeCursor(logger);
consumerData.Cursor = queueCache.GetCacheCursor(consumerData.StreamId.Guid, consumerData.StreamId.Namespace, requestedHandshakeToken.Token);
}
else
{
if (consumerData.Cursor == null) // if the consumer did not ask for a specific token and we already have a cursor, jsut keep using it.
consumerData.Cursor = queueCache.GetCacheCursor(consumerData.StreamId.Guid, consumerData.StreamId.Namespace, cacheToken);
}
}
catch (Exception exception)
{
exceptionOccured = exception;
}
if (exceptionOccured != null)
{
bool faultedSubscription = await ErrorProtocol(consumerData, exceptionOccured, false, null, requestedHandshakeToken != null ? requestedHandshakeToken.Token : null);
if (faultedSubscription) return false;
}
}
consumerData.LastToken = requestedHandshakeToken; // use what ever the consumer asked for as LastToken for next handshake (even if he asked for null).
// if we don't yet have a cursor (had errors in the handshake or data not available exc), get a cursor at the event that triggered that consumer subscription.
if (consumerData.Cursor == null && queueCache != null)
{
try
{
consumerData.Cursor = queueCache.GetCacheCursor(consumerData.StreamId.Guid, consumerData.StreamId.Namespace, cacheToken);
}
catch (Exception)
{
consumerData.Cursor = queueCache.GetCacheCursor(consumerData.StreamId.Guid, consumerData.StreamId.Namespace, null); // just in case last GetCacheCursor failed.
}
}
return true;
}
