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SqsMqBuffer.cs
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SqsMqBuffer.cs
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using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Linq;
using Amazon.SQS;
using Amazon.SQS.Model;
using ServiceStack.Aws.Support;
namespace ServiceStack.Aws.Sqs
{
public class SqsMqBuffer : ISqsMqBuffer
{
private readonly SqsQueueDefinition queueDefinition;
private readonly SqsConnectionFactory sqsConnectionFactory;
private IAmazonSQS sqsClient;
private readonly ConcurrentQueue<Message> receiveBuffer = new ConcurrentQueue<Message>();
private readonly ConcurrentQueue<DeleteMessageRequest> deleteBuffer = new ConcurrentQueue<DeleteMessageRequest>();
private readonly ConcurrentQueue<SendMessageRequest> sendBuffer = new ConcurrentQueue<SendMessageRequest>();
private readonly ConcurrentQueue<ChangeMessageVisibilityRequest> cvBuffer = new ConcurrentQueue<ChangeMessageVisibilityRequest>();
public SqsMqBuffer(SqsQueueDefinition queueDefinition,
SqsConnectionFactory sqsConnectionFactory)
{
Guard.AgainstNullArgument(queueDefinition, "queueDefinition");
Guard.AgainstNullArgument(sqsConnectionFactory, "sqsConnectionFactory");
this.queueDefinition = queueDefinition;
this.sqsConnectionFactory = sqsConnectionFactory;
}
private IAmazonSQS SqsClient => sqsClient ?? (sqsClient = sqsConnectionFactory.GetClient());
public SqsQueueDefinition QueueDefinition => queueDefinition;
public Action<Exception> ErrorHandler { get; set; }
private void HandleError(Exception ex)
{
if (ErrorHandler != null && ex != null)
{
ErrorHandler(ex);
}
}
public bool ChangeVisibility(ChangeMessageVisibilityRequest request)
{
if (request == null)
{
return false;
}
cvBuffer.Enqueue(request);
return CvEnqueued(queueDefinition.ChangeVisibilityBufferSize);
}
private bool CvEnqueued(int minBufferCount, bool forceOne = false)
{
var cvAtAws = false;
minBufferCount = Math.Min(SqsQueueDefinition.MaxBatchCvItems, Math.Max(minBufferCount, 1));
try
{
while (forceOne || cvBuffer.Count >= minBufferCount)
{
forceOne = false;
var entries = EntriesToCv(SqsQueueDefinition.MaxBatchCvItems).ToList();
if (entries.Count <= 0)
break;
cvAtAws = true;
var response = SqsClient.ChangeMessageVisibilityBatch(new ChangeMessageVisibilityBatchRequest
{
QueueUrl = queueDefinition.QueueUrl,
Entries = entries
});
if (response.Failed != null && response.Failed.Count > 0)
{
response.Failed.Each(f => HandleError(f.ToException()));
}
}
}
catch (Exception ex)
{
HandleError(ex);
}
return cvAtAws;
}
private IEnumerable<ChangeMessageVisibilityBatchRequestEntry> EntriesToCv(int count)
{
var result = new Dictionary<string, ChangeMessageVisibilityBatchRequestEntry>(count);
while (result.Count < count)
{
if (!cvBuffer.TryDequeue(out var request))
return result.Values;
var hashId = request.ReceiptHandle.ToSha256HashString64();
if (!result.ContainsKey(hashId))
{
result.Add(hashId, new ChangeMessageVisibilityBatchRequestEntry
{
Id = Guid.NewGuid().ToString("N"),
ReceiptHandle = request.ReceiptHandle,
VisibilityTimeout = request.VisibilityTimeout
});
}
}
return result.Values;
}
public bool Send(SendMessageRequest request)
{
if (request == null)
return false;
sendBuffer.Enqueue(request);
return SendEnqueued(queueDefinition.SendBufferSize);
}
private bool SendEnqueued(int minBufferCount, bool forceOne = false)
{
var sentToSqs = false;
minBufferCount = Math.Min(SqsQueueDefinition.MaxBatchSendItems, Math.Max(minBufferCount, 1));
try
{
while (forceOne || sendBuffer.Count >= minBufferCount)
{
forceOne = false;
var entries = EntriesToSend(SqsQueueDefinition.MaxBatchSendItems).ToList();
if (entries.Count <= 0)
break;
sentToSqs = true;
var response = SqsClient.SendMessageBatch(new SendMessageBatchRequest
{
QueueUrl = queueDefinition.QueueUrl,
Entries = entries
});
if (response.Failed != null && response.Failed.Count > 0)
{
response.Failed.Each(f => HandleError(f.ToException()));
}
}
}
catch (Exception ex)
{
HandleError(ex);
}
return sentToSqs;
}
private IEnumerable<SendMessageBatchRequestEntry> EntriesToSend(int count)
{
var results = 0;
while (results < count)
{
if (!sendBuffer.TryDequeue(out var request))
yield break;
yield return new SendMessageBatchRequestEntry
{
Id = Guid.NewGuid().ToString("N"),
MessageBody = request.MessageBody,
DelaySeconds = request.DelaySeconds,
MessageAttributes = request.MessageAttributes
};
results++;
}
}
public bool Delete(DeleteMessageRequest request)
{
if (request == null)
return false;
deleteBuffer.Enqueue(request);
return DeleteEnqueued(queueDefinition.DeleteBufferSize);
}
private bool DeleteEnqueued(int minBufferCount, bool forceOne = false)
{
var deletedAtSqs = false;
minBufferCount = Math.Min(SqsQueueDefinition.MaxBatchDeleteItems, Math.Max(minBufferCount, 1));
try
{
while (forceOne || deleteBuffer.Count >= minBufferCount)
{
forceOne = false;
var entries = EntriesToDelete(SqsQueueDefinition.MaxBatchDeleteItems).ToList();
if (entries.Count <= 0)
break;
deletedAtSqs = true;
var response = SqsClient.DeleteMessageBatch(new DeleteMessageBatchRequest
{
QueueUrl = queueDefinition.QueueUrl,
Entries = entries
});
if (response.Failed != null && response.Failed.Count > 0)
{
response.Failed.Each(f => HandleError(f.ToException()));
}
}
}
catch (Exception ex)
{
HandleError(ex);
}
return deletedAtSqs;
}
private IEnumerable<DeleteMessageBatchRequestEntry> EntriesToDelete(int count)
{
var result = new Dictionary<string, DeleteMessageBatchRequestEntry>(count);
while (result.Count < count)
{
if (!deleteBuffer.TryDequeue(out var request))
return result.Values;
var hashId = request.ReceiptHandle.ToSha256HashString64();
if (!result.ContainsKey(hashId))
{
result.Add(hashId, new DeleteMessageBatchRequestEntry
{
Id = Guid.NewGuid().ToString("N"),
ReceiptHandle = request.ReceiptHandle
});
}
}
return result.Values;
}
private Message BufferResponse(ReceiveMessageResponse response)
{
if (response?.Messages == null)
return null;
Message toReturn = null;
foreach (var message in response.Messages.Where(m => m != null))
{
if (toReturn == null)
{
toReturn = message;
continue;
}
receiveBuffer.Enqueue(message);
}
return toReturn;
}
public Message Receive(ReceiveMessageRequest request)
{
if (request == null)
return null;
if (receiveBuffer.Count > 0 && receiveBuffer.TryDequeue(out var toReturn))
return toReturn;
request.MaxNumberOfMessages = Math.Min(SqsQueueDefinition.MaxBatchReceiveItems, Math.Max(request.MaxNumberOfMessages, 1));
var response = SqsClient.ReceiveMessage(request);
return BufferResponse(response);
}
private void NakBufferedReceived()
{
Message toNak = null;
var stopAt = DateTime.UtcNow.AddSeconds(30);
while (receiveBuffer.Count > 0 && DateTime.UtcNow <= stopAt && receiveBuffer.TryDequeue(out toNak))
{
ChangeVisibility(new ChangeMessageVisibilityRequest
{
QueueUrl = queueDefinition.QueueUrl,
ReceiptHandle = toNak.ReceiptHandle,
VisibilityTimeout = 0
});
}
}
public int DeleteBufferCount => deleteBuffer.Count;
public int SendBufferCount => sendBuffer.Count;
public int ChangeVisibilityBufferCount => cvBuffer.Count;
public int ReceiveBufferCount => receiveBuffer.Count;
public void Drain(bool fullDrain, bool nakReceived = false)
{
SendEnqueued(fullDrain ? 1 : SqsQueueDefinition.MaxBatchSendItems, forceOne: true);
if (nakReceived)
{
NakBufferedReceived();
}
CvEnqueued(fullDrain ? 1 : SqsQueueDefinition.MaxBatchCvItems, forceOne: true);
DeleteEnqueued(fullDrain ? 1 : SqsQueueDefinition.MaxBatchDeleteItems, forceOne: true);
}
public void Dispose()
{ // Do our best to drain all the buffers
Drain(fullDrain: true, nakReceived: true);
if (sqsClient == null)
{
return;
}
try
{
sqsClient.Dispose();
sqsClient = null;
}
catch { }
}
}
}