async Task ProcessMessage(Message receivedMessage, CancellationToken token)
{
try
{
byte[] messageBody = null;
TransportMessage transportMessage = null;
Exception exception = null;
var nativeMessageId = receivedMessage.MessageId;
string messageId = null;
var isPoisonMessage = false;
try
{
if (receivedMessage.MessageAttributes.TryGetValue(Headers.MessageId, out var messageIdAttribute))
{
messageId = messageIdAttribute.StringValue;
}
else
{
messageId = nativeMessageId;
}
transportMessage = SimpleJson.DeserializeObject <TransportMessage>(receivedMessage.Body);
messageBody = await transportMessage.RetrieveBody(s3Client, configuration, token).ConfigureAwait(false);
}
catch (OperationCanceledException)
{
// shutting down
return;
}
catch (Exception ex)
{
// Can't deserialize. This is a poison message
exception = ex;
isPoisonMessage = true;
}
if (isPoisonMessage || messageBody == null || transportMessage == null)
{
var logMessage = $"Treating message with {messageId} as a poison message. Moving to error queue.";
if (exception != null)
{
Logger.Warn(logMessage, exception);
}
else
{
Logger.Warn(logMessage);
}
await MovePoisonMessageToErrorQueue(receivedMessage, messageId).ConfigureAwait(false);
return;
}
if (!IsMessageExpired(receivedMessage, transportMessage.Headers, messageId, CorrectClockSkew.GetClockCorrectionForEndpoint(awsEndpointUrl)))
{
// here we also want to use the native message id because the core demands it like that
await ProcessMessageWithInMemoryRetries(transportMessage.Headers, nativeMessageId, messageBody, 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 DeleteMessageAndBodyIfRequired(receivedMessage, transportMessage.S3BodyKey).ConfigureAwait(false);
}
finally
{
maxConcurrencySemaphore.Release();
}
}
