async Task ProcessMessage(Message receivedMessage, CancellationToken token)
{
try
{
await maxConcurrencySempahore.WaitAsync(token).ConfigureAwait(false);
}
catch (OperationCanceledException)
{
// shutting down, semaphore doesn't need to be released because it was never acquired
return;
}
try
{
IncomingMessage incomingMessage = null;
TransportMessage transportMessage = null;
var isPoisonMessage = false;
try
{
transportMessage = JsonConvert.DeserializeObject <TransportMessage>(receivedMessage.Body);
incomingMessage = await transportMessage.ToIncomingMessage(s3Client, configuration, token).ConfigureAwait(false);
}
catch (OperationCanceledException)
{
// shutting down
return;
}
catch (Exception ex)
{
// Can't deserialize. This is a poison message
Logger.Warn($"Treating message with SQS Message Id {receivedMessage.MessageId} as a poison message due to exception {ex}. Moving to error queue.");
isPoisonMessage = true;
}
if (incomingMessage == null || transportMessage == null)
{
Logger.Warn($"Treating message with SQS Message Id {receivedMessage.MessageId} as a poison message because it could not be converted to an IncomingMessage. Moving to error queue.");
isPoisonMessage = true;
}
if (isPoisonMessage)
{
await MovePoisonMessageToErrorQueue(receivedMessage).ConfigureAwait(false);
return;
}
if (!IsMessageExpired(receivedMessage, incomingMessage))
{
await ProcessMessageWithInMemoryRetries(incomingMessage, token).ConfigureAwait(false);
}
// Always delete the message from the queue.
// If processing failed, the onError handler will have moved the message
// to a retry queue.
await DeleteMessage(receivedMessage, transportMessage, incomingMessage, token).ConfigureAwait(false);
}
finally
{
maxConcurrencySempahore.Release();
}
}
