public void Exceptions_in_OnQueueEmpty_are_ignored()
{
// Arrange
var onMessageInvokeCount = 0;
var onQueueEmptyInvokeCount = 0;
var onErrorInvokeCount = 0;
var exceptionSimulated = false;
var lockObject = new Object();
var queueName = "myqueue";
var mockQueue = GetMockQueue(queueName);
var mockQueueClient = GetMockQueueClient(mockQueue);
var mockBlobContainer = GetMockBlobContainer();
var mockBlobClient = GetMockBlobClient(mockBlobContainer);
var mockStorageAccount = GetMockStorageAccount(mockBlobClient, mockQueueClient);
mockQueue.Setup(q => q.GetMessagesAsync(It.IsAny <int>(), It.IsAny <TimeSpan?>(), It.IsAny <QueueRequestOptions>(), It.IsAny <OperationContext>(), It.IsAny <CancellationToken>())).ReturnsAsync(Enumerable.Empty <CloudQueueMessage>());
var messagePump = new AsyncMessagePump("myqueue", mockStorageAccount.Object, 1, TimeSpan.FromMinutes(1), 3);
messagePump.OnMessage = (message, cancellationToken) =>
{
Interlocked.Increment(ref onMessageInvokeCount);
};
messagePump.OnQueueEmpty = cancellationToken =>
{
Interlocked.Increment(ref onQueueEmptyInvokeCount);
// Simulate an exception (only the first time)
lock (lockObject)
{
if (!exceptionSimulated)
{
exceptionSimulated = true;
throw new Exception("This dummy exception should be ignored");
}
}
// Stop the message pump
messagePump.Stop();
};
messagePump.OnError = (message, exception, isPoison) =>
{
Interlocked.Increment(ref onErrorInvokeCount);
};
// Act
messagePump.Start();
// Assert
onMessageInvokeCount.ShouldBe(0);
onQueueEmptyInvokeCount.ShouldBeGreaterThan(0);
onErrorInvokeCount.ShouldBe(0);
mockQueue.Verify(q => q.GetMessagesAsync(It.IsAny <int>(), It.IsAny <TimeSpan?>(), It.IsAny <QueueRequestOptions>(), It.IsAny <OperationContext>(), It.IsAny <CancellationToken>()), Times.AtLeast(1));
}
public void Start_without_OnMessage_throws()
{
// Arrange
var mockStorageUri = new Uri("http://bogus/myaccount");
var mockQueue = new Mock <CloudQueue>(MockBehavior.Strict, mockStorageUri);
var messagePump = new AsyncMessagePump(mockQueue.Object, 1, 1, TimeSpan.FromMinutes(1), 3);
// Act
messagePump.Start();
}
public void Exceptions_in_OnQueueEmpty_are_ignored()
{
// Arrange
var onMessageInvokeCount = 0;
var onQueueEmptyInvokeCount = 0;
var onErrorInvokeCount = 0;
var exceptionSimulated = false;
var lockObject = new Object();
var mockStorageUri = new Uri("http://bogus/myaccount");
var mockQueue = new Mock <CloudQueue>(MockBehavior.Strict, mockStorageUri);
mockQueue.Setup(q => q.GetMessageAsync(It.IsAny <TimeSpan?>(), It.IsAny <QueueRequestOptions>(), It.IsAny <OperationContext>(), It.IsAny <CancellationToken>())).Returns <CloudQueueMessage>(null);
var messagePump = new AsyncMessagePump(mockQueue.Object, 1, 1, TimeSpan.FromMinutes(1), 3);
messagePump.OnMessage = (message, cancellationToken) =>
{
Interlocked.Increment(ref onMessageInvokeCount);
};
messagePump.OnQueueEmpty = cancellationToken =>
{
Interlocked.Increment(ref onQueueEmptyInvokeCount);
// Simulate an exception (only the first time)
lock (lockObject)
{
if (!exceptionSimulated)
{
exceptionSimulated = true;
throw new Exception("This dummy exception should be ignored");
}
}
// Run the 'OnStop' on a different thread so we don't block it
Task.Run(() =>
{
messagePump.Stop();
}).ConfigureAwait(false);
};
messagePump.OnError = (message, exception, isPoison) =>
{
Interlocked.Increment(ref onErrorInvokeCount);
};
// Act
messagePump.Start();
// Assert
Assert.AreEqual(0, onMessageInvokeCount);
Assert.IsTrue(onQueueEmptyInvokeCount > 0);
Assert.AreEqual(0, onErrorInvokeCount);
mockQueue.Verify(q => q.GetMessageAsync(It.IsAny <TimeSpan?>(), It.IsAny <QueueRequestOptions>(), It.IsAny <OperationContext>(), It.IsAny <CancellationToken>()), Times.AtLeast(1));
}
public void No_message_processed_when_queue_is_empty()
{
// Arrange
var onMessageInvokeCount = 0;
var onQueueEmptyInvokeCount = 0;
var onErrorInvokeCount = 0;
var mockStorageUri = new Uri("http://bogus/myaccount");
var mockQueue = new Mock <CloudQueue>(MockBehavior.Strict, mockStorageUri);
mockQueue.Setup(q => q.GetMessageAsync(It.IsAny <TimeSpan?>(), It.IsAny <QueueRequestOptions>(), It.IsAny <OperationContext>(), It.IsAny <CancellationToken>())).Returns <CloudQueueMessage>(null);
var messagePump = new AsyncMessagePump(mockQueue.Object, 1, 1, TimeSpan.FromMinutes(1), 3);
messagePump.OnMessage = (message, cancellationToken) =>
{
Interlocked.Increment(ref onMessageInvokeCount);
};
messagePump.OnQueueEmpty = cancellationToken =>
{
Interlocked.Increment(ref onQueueEmptyInvokeCount);
// Run the 'OnStop' on a different thread so we don't block it
Task.Run(() =>
{
messagePump.Stop();
}).ConfigureAwait(false);
};
messagePump.OnError = (message, exception, isPoison) =>
{
Interlocked.Increment(ref onErrorInvokeCount);
};
// Act
messagePump.Start();
// Assert
Assert.AreEqual(0, onMessageInvokeCount);
Assert.AreEqual(1, onQueueEmptyInvokeCount);
Assert.AreEqual(0, onErrorInvokeCount);
// You would expect the 'GetMessageAsync' method to be invoked only once, but unfortunately we can't be sure.
// It will be invoked a small number of times (probably once or twice, maybe three times but not more than that).
// However we can't be more precise because we stop the message pump on another thread and 'GetMessageAsync' may be invoked
// a few times while we wait for the message pump to stop.
//
// What this means is that there is no way to precisely assert the number of times the method has been invoked. The only
// thing we know for sure, is that 'GetMessageAsync' has been invoked at least once
mockQueue.Verify(q => q.GetMessageAsync(It.IsAny <TimeSpan?>(), It.IsAny <QueueRequestOptions>(), It.IsAny <OperationContext>(), It.IsAny <CancellationToken>()), Times.AtLeast(1));
}
public void No_message_processed_when_queue_is_empty()
{
// Arrange
var onMessageInvokeCount = 0;
var onQueueEmptyInvokeCount = 0;
var onErrorInvokeCount = 0;
var queueName = "myqueue";
var mockQueue = GetMockQueue(queueName);
var mockQueueClient = GetMockQueueClient(mockQueue);
var mockBlobContainer = GetMockBlobContainer();
var mockBlobClient = GetMockBlobClient(mockBlobContainer);
var mockStorageAccount = GetMockStorageAccount(mockBlobClient, mockQueueClient);
mockQueue.Setup(q => q.GetMessagesAsync(It.IsAny <int>(), It.IsAny <TimeSpan?>(), It.IsAny <QueueRequestOptions>(), It.IsAny <OperationContext>(), It.IsAny <CancellationToken>())).ReturnsAsync(Enumerable.Empty <CloudQueueMessage>());
var messagePump = new AsyncMessagePump("myqueue", mockStorageAccount.Object, 1, TimeSpan.FromMinutes(1), 3);
messagePump.OnMessage = (message, cancellationToken) =>
{
Interlocked.Increment(ref onMessageInvokeCount);
};
messagePump.OnQueueEmpty = cancellationToken =>
{
Interlocked.Increment(ref onQueueEmptyInvokeCount);
messagePump.Stop();
};
messagePump.OnError = (message, exception, isPoison) =>
{
Interlocked.Increment(ref onErrorInvokeCount);
};
// Act
messagePump.Start();
// Assert
onMessageInvokeCount.ShouldBe(0);
onQueueEmptyInvokeCount.ShouldBe(1);
onErrorInvokeCount.ShouldBe(0);
// You would expect the 'GetMessagesAsync' method to be invoked only once, but unfortunately we can't be sure.
// It will be invoked a small number of times (probably once or twice, maybe three times but not more than that).
// However we can't be more precise because we stop the message pump on another thread and 'GetMessagesAsync' may
// be invoked a few times while we wait for the message pump to stop.
//
// What this means is that there is no way to precisely assert the number of times the method has been invoked.
// The only thing we know for sure, is that 'GetMessagesAsync' has been invoked at least once
mockQueue.Verify(q => q.GetMessagesAsync(It.IsAny <int>(), It.IsAny <TimeSpan?>(), It.IsAny <QueueRequestOptions>(), It.IsAny <OperationContext>(), It.IsAny <CancellationToken>()), Times.AtLeast(1));
}
public void Start_without_OnMessage_throws()
{
// Arrange
var queueName = "myqueue";
var mockQueue = GetMockQueue(queueName);
var mockQueueClient = GetMockQueueClient(mockQueue);
var mockBlobContainer = GetMockBlobContainer();
var mockBlobClient = GetMockBlobClient(mockBlobContainer);
var mockStorageAccount = GetMockStorageAccount(mockBlobClient, mockQueueClient);
var messagePump = new AsyncMessagePump("myqueue", mockStorageAccount.Object, 1, TimeSpan.FromMinutes(1), 3);
// Act
Should.Throw <ArgumentNullException>(() => messagePump.Start());
}
public static void ProcessSimpleMessages(string queueName, CloudStorageAccount storageAccount, ILogProvider logProvider, IMetrics metrics)
{
var logger = logProvider.GetLogger("ProcessSimpleMessages");
Stopwatch sw = null;
// Configure the message pump
var messagePump = new AsyncMessagePump(queueName, storageAccount, 10, TimeSpan.FromMinutes(1), 3, metrics)
{
OnMessage = (message, cancellationToken) =>
{
logger(Logging.LogLevel.Debug, () => message.Content.ToString());
}
};
// Stop the message pump when the queue is empty.
messagePump.OnQueueEmpty = cancellationToken =>
{
// Stop the timer
if (sw.IsRunning)
{
sw.Stop();
}
// Stop the message pump
logger(Logging.LogLevel.Debug, () => "Asking the 'simple' message pump to stop");
messagePump.Stop();
logger(Logging.LogLevel.Debug, () => "The 'simple' message pump has been stopped");
};
// Start the message pump
sw = Stopwatch.StartNew();
logger(Logging.LogLevel.Debug, () => "The 'simple' message pump is starting");
messagePump.Start();
// Display summary
logger(Logging.LogLevel.Info, () => $"\tDone in {sw.Elapsed.ToDurationString()}");
}
public void Poison_message_is_rejected()
{
// Arrange
var onMessageInvokeCount = 0;
var onQueueEmptyInvokeCount = 0;
var onErrorInvokeCount = 0;
var isRejected = false;
var retries = 3;
var lockObject = new Object();
var cloudMessage = new CloudQueueMessage("Message");
var queueName = "myqueue";
var mockQueue = GetMockQueue(queueName);
var mockQueueClient = GetMockQueueClient(mockQueue);
var mockBlobContainer = GetMockBlobContainer();
var mockBlobClient = GetMockBlobClient(mockBlobContainer);
var mockStorageAccount = GetMockStorageAccount(mockBlobClient, mockQueueClient);
mockQueue.Setup(q => q.GetMessagesAsync(It.IsAny <int>(), It.IsAny <TimeSpan?>(), It.IsAny <QueueRequestOptions>(), It.IsAny <OperationContext>(), It.IsAny <CancellationToken>())).ReturnsAsync((int messageCount, TimeSpan? visibilityTimeout, QueueRequestOptions options, OperationContext operationContext, CancellationToken cancellationToken) =>
{
if (cloudMessage != null)
{
lock (lockObject)
{
if (cloudMessage != null)
{
// DequeueCount is a private property. Therefore we must use reflection to change its value
var dequeueCountProperty = cloudMessage.GetType().GetProperty("DequeueCount");
dequeueCountProperty.SetValue(cloudMessage, retries + 1); // intentionally set 'DequeueCount' to a value exceeding maxRetries to simulate a poison message
return(new[] { cloudMessage });
}
}
}
return(Enumerable.Empty <CloudQueueMessage>());
});
mockQueue.Setup(q => q.DeleteMessageAsync(It.IsAny <string>(), It.IsAny <string>(), It.IsAny <QueueRequestOptions>(), It.IsAny <OperationContext>(), It.IsAny <CancellationToken>())).Returns((string messageId, string popReceipt, QueueRequestOptions options, OperationContext operationContext, CancellationToken cancellationToken) =>
{
lock (lockObject)
{
cloudMessage = null;
}
return(Task.FromResult(true));
});
var messagePump = new AsyncMessagePump("myqueue", mockStorageAccount.Object, 1, TimeSpan.FromMinutes(1), retries);
messagePump.OnMessage = (message, cancellationToken) =>
{
Interlocked.Increment(ref onMessageInvokeCount);
throw new Exception("An error occured when attempting to process the message");
};
messagePump.OnQueueEmpty = cancellationToken =>
{
Interlocked.Increment(ref onQueueEmptyInvokeCount);
messagePump.Stop();
};
messagePump.OnError = (message, exception, isPoison) =>
{
Interlocked.Increment(ref onErrorInvokeCount);
if (isPoison)
{
lock (lockObject)
{
isRejected = true;
cloudMessage = null;
}
}
};
// Act
messagePump.Start();
// Assert
onMessageInvokeCount.ShouldBe(1);
onQueueEmptyInvokeCount.ShouldBeGreaterThan(0);
onErrorInvokeCount.ShouldBe(1);
isRejected.ShouldBeTrue();
mockQueue.Verify(q => q.GetMessagesAsync(It.IsAny <int>(), It.IsAny <TimeSpan?>(), It.IsAny <QueueRequestOptions>(), It.IsAny <OperationContext>(), It.IsAny <CancellationToken>()), Times.AtLeast(2));
mockQueue.Verify(q => q.DeleteMessageAsync(It.IsAny <string>(), It.IsAny <string>(), It.IsAny <QueueRequestOptions>(), It.IsAny <OperationContext>(), It.IsAny <CancellationToken>()), Times.Exactly(1));
}
public void Poison_message_is_rejected()
{
// Arrange
var onMessageInvokeCount = 0;
var onQueueEmptyInvokeCount = 0;
var onErrorInvokeCount = 0;
var isRejected = false;
var retries = 3;
var lockObject = new Object();
var cloudMessage = new CloudQueueMessage("Message");
var mockStorageUri = new Uri("http://bogus/myaccount");
var mockQueue = new Mock <CloudQueue>(MockBehavior.Strict, mockStorageUri);
mockQueue.Setup(q => q.GetMessageAsync(It.IsAny <TimeSpan?>(), It.IsAny <QueueRequestOptions>(), It.IsAny <OperationContext>(), It.IsAny <CancellationToken>())).Returns((TimeSpan? visibilityTimeout, QueueRequestOptions options, OperationContext operationContext, CancellationToken cancellationToken) =>
{
if (cloudMessage == null)
{
return(null);
}
lock (lockObject)
{
if (cloudMessage != null)
{
// DequeueCount is a private property. Therefore we must use reflection to change its value
var t = cloudMessage.GetType();
t.InvokeMember("DequeueCount", BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.SetProperty | BindingFlags.Instance, null, cloudMessage, new object[] { cloudMessage.DequeueCount + 1 });
}
return(Task.FromResult(cloudMessage));
}
});
mockQueue.Setup(q => q.DeleteMessageAsync(It.IsAny <CloudQueueMessage>())).Returns((CloudQueueMessage message) =>
{
lock (lockObject)
{
cloudMessage = null;
}
return(Task.FromResult(true));
});
var messagePump = new AsyncMessagePump(mockQueue.Object, 1, 1, TimeSpan.FromMinutes(1), retries);
messagePump.OnMessage = (message, cancellationToken) =>
{
Interlocked.Increment(ref onMessageInvokeCount);
throw new Exception("An error occured when attempting to process the message");
};
messagePump.OnQueueEmpty = cancellationToken =>
{
Interlocked.Increment(ref onQueueEmptyInvokeCount);
// Run the 'OnStop' on a different thread so we don't block it
Task.Run(() =>
{
messagePump.Stop();
}).ConfigureAwait(false);
};
messagePump.OnError = (message, exception, isPoison) =>
{
Interlocked.Increment(ref onErrorInvokeCount);
if (isPoison)
{
lock (lockObject)
{
isRejected = true;
cloudMessage = null;
}
}
};
// Act
messagePump.Start();
// Assert
Assert.AreEqual(retries + 1, onMessageInvokeCount);
Assert.IsTrue(onQueueEmptyInvokeCount > 0);
Assert.AreEqual(retries + 1, onErrorInvokeCount);
Assert.IsTrue(isRejected);
mockQueue.Verify(q => q.GetMessageAsync(It.IsAny <TimeSpan?>(), It.IsAny <QueueRequestOptions>(), It.IsAny <OperationContext>(), It.IsAny <CancellationToken>()), Times.AtLeast(retries));
}
#pragma warning disable RECS0154 // Parameter is never used
static void Main(string[] args)
#pragma warning restore RECS0154 // Parameter is never used
{
// Ensure the storage emulator is running
AzureStorageEmulatorManager.StartStorageEmulator();
// If you want to see tracing from the Picton libary, change the LogLevel to 'Trace'
var minLogLevel = Logging.LogLevel.Debug;
// Configure logging to the console
var logProvider = new ColoredConsoleLogProvider(minLogLevel);
var logger = logProvider.GetLogger("IntegrationTests");
LogProvider.SetCurrentLogProvider(logProvider);
// Ensure the Console is tall enough
Console.WindowHeight = 60;
// Setup the message queue in Azure storage emulator
var storageAccount = CloudStorageAccount.DevelopmentStorageAccount;
var cloudQueueClient = storageAccount.CreateCloudQueueClient();
cloudQueueClient.DefaultRequestOptions.RetryPolicy = new NoRetry();
var cloudQueue = cloudQueueClient.GetQueueReference("myqueue");
cloudQueue.CreateIfNotExists();
var lockObject = new Object();
var stopping = false;
Stopwatch sw = null;
// Add messages to our testing queue
for (var i = 0; i < 50; i++)
{
cloudQueue.AddMessage(new CloudQueueMessage($"Hello world {i}"));
}
// Configure the message pump
var messagePump = new AsyncMessagePump(cloudQueue, 1, 25, TimeSpan.FromMinutes(1), 3);
messagePump.OnMessage = (message, cancellationToken) =>
{
logger(Logging.LogLevel.Debug, () => message.AsString);
};
messagePump.OnQueueEmpty = cancellationToken =>
{
// Stop the message pump when the queue is empty.
// However, ensure that we try to stop it only once (otherwise each concurrent task would try to stop it)
if (!stopping)
{
lock (lockObject)
{
if (sw.IsRunning)
{
sw.Stop();
}
if (!stopping)
{
// Indicate that the message pump is stopping
stopping = true;
// Log to console
logger(Logging.LogLevel.Debug, () => "Asking the message pump to stop");
// Run the 'OnStop' on a different thread so we don't block it
Task.Run(() =>
{
messagePump.Stop();
logger(Logging.LogLevel.Debug, () => "Message pump has been stopped");
}).ConfigureAwait(false);
}
}
}
};
// Start the message pump
sw = Stopwatch.StartNew();
logger(Logging.LogLevel.Debug, () => "Message pump is starting");
messagePump.Start();
// Display summary
logger(Logging.LogLevel.Info, () => "Elapsed Milliseconds: " + sw.Elapsed.ToDurationString());
logger(Logging.LogLevel.Info, () => "Press any key to exit...");
// Flush the console key buffer
while (Console.KeyAvailable)
{
Console.ReadKey(true);
}
// Wait for user to press a key
Console.ReadKey();
}