private async Task DeadLetterMessage(T vstsMessage, IServiceBusMessage message, IDictionary <string, string> eventProperties, string errorMessage, CancellationToken cancellationToken)
{
if (!eventProperties.ContainsKey(VstsMessageConstants.ErrorTypePropertyName))
{
eventProperties[VstsMessageConstants.ErrorTypePropertyName] = errorMessage;
}
await this.TryFailOrchestrationPlan(vstsMessage, cancellationToken).ConfigureAwait(false);
await clientLogger.LogError("DeadLetterMessage", errorMessage, eventProperties, cancellationToken).ConfigureAwait(false);
await this.queueClient.DeadLetterAsync(message.GetLockToken()).ConfigureAwait(false);
}
public async Task ReceiveAsync(IServiceBusMessage message, CancellationToken cancellationToken)
{
// setup basic message properties
var messageStopwatch = Stopwatch.StartNew();
var eventProperties = ExtractServiceBusMessageProperties(message);
Exception exception = null;
T vstsMessage = null;
try
{
// validate & extract
string errorMessage;
if (!ExtractMessage(message, out vstsMessage, out errorMessage))
{
await this.DeadLetterMessage(null, message, eventProperties, errorMessage, cancellationToken).ConfigureAwait(false);
await this.StopTimer("MessageExtractionFailed", messageStopwatch, eventProperties, cancellationToken).ConfigureAwait(false);
return;
}
// merge vsts properties
foreach (var property in vstsMessage.GetMessageProperties())
{
eventProperties[property.Key] = property.Value;
}
// process message
await this.ProcessMessage(message, this.scheduleHandler, cancellationToken, vstsMessage, eventProperties).ConfigureAwait(false);
await this.queueClient.CompleteAsync(message.GetLockToken()).ConfigureAwait(false);
await this.StopTimer("MessageProcessingSucceeded", messageStopwatch, eventProperties, cancellationToken).ConfigureAwait(false);
}
catch (Exception ex)
{
exception = ex;
}
// c#6.0 allows await inside catch but this code is not 6.0 yet :-(
if (exception != null)
{
await this.StopTimer("MessageProcessingFailed", messageStopwatch, eventProperties, cancellationToken).ConfigureAwait(false);
await this.AbandonOrDeadLetterMessage(vstsMessage, message, exception, eventProperties, cancellationToken).ConfigureAwait(false);
}
}
private async Task DelayedAbandon(IServiceBusMessage message, int attempt, Exception exception, IDictionary <string, string> eventProperties, CancellationToken cancellationToken)
{
// exponential backoff
var delayMsecs = this.settings.AbandonDelayMsecs + (1000 * (int)(Math.Pow(2, Math.Max(0, attempt - 1)) - 1));
delayMsecs = Math.Min(delayMsecs, this.settings.MaxAbandonDelayMsecs);
var abandoningMessageDueToException = string.Format("Abandoning message due to exception in [{0}]ms", delayMsecs);
await clientLogger.LogException(exception, "MessageProcessingException", abandoningMessageDueToException, eventProperties, cancellationToken).ConfigureAwait(false);
while (delayMsecs > 0)
{
// await message.RenewLockAsync().ConfigureAwait(false);
var delay = settings.LockRefreshDelayMsecs == 0 ? 10 : settings.LockRefreshDelayMsecs;
await Task.Delay(delay, cancellationToken);
delayMsecs -= delay;
cancellationToken.ThrowIfCancellationRequested();
}
await this.queueClient.AbandonAsync(message.GetLockToken()).ConfigureAwait(false);
}