In my endeavor to get a better understanding of Azure Logic Apps, I converted some existing code in one of my side projects from Azure Storage Queues and Azure Functions to Service Bus and Logic Apps.
The code I was converting sends notifications to users. My code will send a message to a Service Bus queue, which will then be picked up by a Logic App, which will then send an email, via SendGrid, to the multiple recipients.
The following Azure resources are needed:
- Service Bus
- Service Bus Queue
- SendGrid – The free tier works perfect, you will also need to create an API Key, which the Logic App will use
The following is the code I am using to send a message to the Service Bus queue:
var retryPolicy = new RetryExponential(TimeSpan.FromSeconds(0.1), TimeSpan.FromSeconds(30), 3); var json = JsonConvert.SerializeObject(data); var message = new Message( Encoding.UTF8.GetBytes(json)); message.ContentType = "application/json"; var queueClient = new QueueClient( _azureServiceBusOptions.Value.PrimaryConnectionString, type, retryPolicy: retryPolicy);
Step 1 – Create Logic App
Assuming you have created all the necessary Azure resources, you can now create your Logic App.
Step 2 – Add Service Bus Trigger
Add a trigger that reads a message from Service Bus. You will be prompted to create your connection first, followed by selecting your queue and setting the retrieval interval.
Step 3 – Convert Service Bus Message to JSON
The next step involved add a Parse JSON step to convert the content from a Base64 String to JSON.
You will also want to paste in a sample of the JSON schema, this will allow further steps to access the properties.
Step 4 – Send Email
You now add a step to loop through each recipient and send the email message.
I apologize for the brevity of this post, it is more or less for my notes, but figured someone might get some help from it, thus the reason for sharing.