public HttpResponseMessage Subscribe([FromBody] EventHubInput input)
{
if (!String.IsNullOrEmpty(input.callbackUrl))
{
if (!InMemoryTriggerStore.Instance.GetStore().ContainsKey(input.callbackUrl))
{
HostingEnvironment.QueueBackgroundWorkItem(async ct => await InMemoryTriggerStore.Instance.RegisterTrigger(input));
}
}
return(Request.CreateResponse());
}
/// <summary>
/// The method that registers Event Hub listeners and assigns them to a Receive event. When I receive an event from the event hub listener, I trigger the callbackURL
/// </summary>
/// <param name="triggerId"></param>
/// <param name="triggerInput"></param>
public async Task RegisterTrigger(EventHubInput input)
{
var client = EventHubClient.CreateFromConnectionString(input.eventHubConnectionString, input.eventHubName);
EventHubConsumerGroup group = String.IsNullOrEmpty(input.consumerGroup) ?
client.GetDefaultConsumerGroup() : client.GetConsumerGroup(input.consumerGroup);
string[] partitions;
//If they specified partitions, iterate over their list to only listen to the partitions they specified
if (!String.IsNullOrEmpty(input.eventHubPartitionList))
{
partitions = input.eventHubPartitionList.Split(',');
}
//If they left it blank, create a list to listen to all partitions
else
{
partitions = new string[client.GetRuntimeInformation().PartitionCount];
for (int x = 0; x < partitions.Length; x++)
{
partitions[x] = x.ToString();
}
}
List <CancellationTokenSource> tokenSources = new List <CancellationTokenSource>();
//For ever partition I should listen to, create a thread with a listener on it
foreach (var p in partitions)
{
p.Trim();
var Receiver = group.CreateReceiver(client.GetRuntimeInformation().PartitionIds[int.Parse(p)], DateTime.UtcNow);
EventHubListener listener = new EventHubListener(Receiver);
//Register the event. When I Receive a message, call the method to trigger the logic app
listener.MessageReceived += (sender, e) => TriggerLogicApps(input.callbackUrl, e);
var ts = new CancellationTokenSource();
CancellationToken ct = ts.Token;
listener.StartListening(ct);
tokenSources.Add(ts);
}
//Register the triggerID in my store, so on subsequent checks from the logic app I don't spin up a new set of listeners
_store[input.callbackUrl] = tokenSources;
}