Created
February 23, 2019 22:35
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Example of retrying messages by re-queuing
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[FunctionName("TopicProcessor")] | |
public static async Task Run( | |
[ServiceBusTrigger("%topic-name%", "%subscription-name%", AccessRights.Manage, Connection = "connection")] BrokeredMessage msg, | |
[ServiceBus("%topic-name%", AccessRights.Manage, Connection = "connection", EntityType = EntityType.Topic)] IAsyncCollector<BrokeredMessage> outputTopic, | |
ILogger log) | |
{ | |
var thing = msg.GetBody<Thing>(); | |
try { | |
var apiClient = new ApiClient(); | |
await apiClient.PostAsync(thing); | |
// IMPORTANT- Complete the brokered message! | |
msg.CompleteAsync(); | |
} | |
catch (BadRequestException) { | |
await msg.DeadLetterAsync("a-reason-code", "An error description"); | |
} | |
catch (HttpServiceUnavailableException) { | |
// we will retry... | |
await RetryMessageAsync(msg, outputTopic); | |
} | |
} | |
private async Task RetryMessageAsync(BrokeredMessage msg, IAsyncCollector<BrokeredMessage> outputTopic) | |
{ | |
const string retryCountString = "RetryCount"; | |
// get our custom RetryCount property from the received message if it exists | |
// if not, initiate it to 0 | |
var retryCount = msg.Properties.ContainsKey(retryCountString) | |
? (int)msg.Properties[retryCountString] | |
: 0; | |
// if we've tried 10 times or more, deadletter this message | |
if (retryCount >= 10) | |
{ | |
return _brokeredMessageDeadLetterManager.DeadLetterAsync(msg, "Retry count > 10"); | |
await msg.DeadLetterAsync("too-many-retries", "Retry count > 10"); | |
} | |
// create a copy of the received message | |
var clonedMessage = msg.Clone(); | |
// set the ScheduledEnqueueTimeUtc to 30 seconds from now | |
clonedMessage.ScheduledEnqueueTimeUtc = DateTime.UtcNow.AddSeconds(30); | |
clonedMessage.Properties[retryCountString] = retryCount + 1; | |
await outputQueue.AddAsync(clonedMessage); | |
// IMPORTANT- Complete the original BrokeredMessage! | |
msg.CompleteAsync(); | |
} |
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