/// <summary>
/// Dequeues available WebHooks and sends them out to each WebHook recipient.
/// </summary>
protected virtual async Task DequeueAndSendWebHooks(CancellationToken cancellationToken)
{
bool isEmpty = false;
while (true)
{
try
{
do
{
if (cancellationToken.IsCancellationRequested)
{
return;
}
// Dequeue messages from Azure queue
CloudQueue _queue = await _storageManager.GetCloudQueueAsync(_options.ConnectionString, AzureWebHookSender.WebHookQueue);
IEnumerable <CloudQueueMessage> messages = await _storageManager.GetMessagesAsync(_queue, MaxDequeuedMessages, _options.MessageTimeout);
// Extract the work items
ICollection <WebHookWorkItem> workItems = messages.Select(m =>
{
WebHookWorkItem workItem = JsonConvert.DeserializeObject <WebHookWorkItem>(m.AsString, _serializerSettings);
workItem.Properties[QueueMessageKey] = m;
return(workItem);
}).ToArray();
if (cancellationToken.IsCancellationRequested)
{
return;
}
// Submit work items to be sent to WebHook receivers
if (workItems.Count > 0)
{
await _sender.SendWebHookWorkItemsAsync(workItems);
}
isEmpty = workItems.Count == 0;
}while (!isEmpty);
}
catch (Exception ex)
{
CloudQueue _queue = await _storageManager.GetCloudQueueAsync(_options.ConnectionString, AzureWebHookSender.WebHookQueue);
string msg = string.Format(AzureStorageResource.DequeueManager_ErrorDequeueing, _queue.Name, ex.Message);
_logger.LogError(msg, ex);
}
try
{
await Task.Delay(_options.Frequency, cancellationToken);
}
catch (OperationCanceledException oex)
{
_logger.LogError(oex.Message, oex);
return;
}
}
}
/// <inheritdoc />
public async Task SendWebHookWorkItemsAsync(IEnumerable <WebHookWorkItem> workItems)
{
if (workItems == null)
{
throw new ArgumentNullException("workItems");
}
// Serialize WebHook requests and convert to queue messages
IEnumerable <CloudQueueMessage> messages = null;
try
{
messages = workItems.Select(item =>
{
string content = JsonConvert.SerializeObject(item, _serializerSettings);
CloudQueueMessage message = new CloudQueueMessage(content);
return(message);
}).ToArray();
}
catch (Exception ex)
{
string msg = string.Format(AzureStorageResource.AzureSender_SerializeFailure, ex.Message);
_logger.LogError(msg, ex);
throw new InvalidOperationException(msg);
}
// Insert queue messages into queue.
CloudQueue queue = await _manager.GetCloudQueueAsync(_options.ConnectionString, WebHookQueue);
await _manager.AddMessagesAsync(queue, messages);
}
