public MessageHandler(Azure.Storage.Queues.QueueClient queueClient, Azure.Storage.Queues.QueueClient deadLetterClient, Common.Configuration.IConfigurationManager config, Common.Tracking.IProcessingTracker tracker, ILogger logger)
{
_queueClient = queueClient;
_deadLetterQueueClient = deadLetterClient;
_config = config;
_logger = logger;
_tracker = tracker;
_factory = new RequestProcessorFactory(_config, _tracker, _logger);
}
public async Task ProcessPendingMessagesAsync(CancellationToken token)
{
try
{
await EnsureQueueAsync();
using (var scope = _config.ServiceProvider.CreateScope())
{
Common.Tracking.IProcessingTracker tracker = scope.ServiceProvider.GetRequiredService <Common.Tracking.IProcessingTracker>();
RequestProcessorFactory factory = new RequestProcessorFactory(_config, tracker, _logger);
//currently have a permissions issue w/ accessing queue...
//under "Queue Service" in storage account UI, make sure to set "Authentication Method" to "Azure AD user Account" instead of "Access Key"
while (!token.IsCancellationRequested && (await PendingMessagesExistAsync(token)))
{
QueueMessage[] messages = null;
try
{
messages = await _queueClient.ReceiveMessagesAsync(maxMessages : 1, visibilityTimeout : _messageVisibilityTimeout, cancellationToken : token);
}
catch (Exception ex)
{
_logger.LogError($"Unable to receive messages. Account: {_queueClient.AccountName} Queue: {_queueClient.Name} Exception: {ex.Message}");
}
if (null != messages && messages.Length > 0)
{
MessageHandler <T> handler = new MessageHandler <T>(_queueClient, _deadLetterQueueClient, _config, tracker, _logger);
foreach (var msg in messages)
{
await handler.ProcessMessageAsync(msg, token);
}
}
}
}
_logger.LogInformation($"No additional messages found. Queue: {_queueClient.Name}.");
}
catch (Exception ex) //todo: filter for specific exceptions
{
_logger.LogError($"An error occured while monitoring queue: {_queueClient.Name}. Details: {ex.Message}");
}
}