Logic Apps: CI/CD Part 1- Building your Logic App

Continuous Integration/Continuous Delivery is a development practice that enables you to accelerate your deployments and delivery time to the customer, by reliably releasing software at any time and without manual intervention.

For this post series, I will explain how to enable this practice, oriented to Logic Apps and Azure Pipelines.

We will start by Building the Logic App, using Visual Studio. I will not approach Logic Apps Preview, because since it’s still a preview feature, many changes can happen and render all this useless.

As you may know, to create Logic Apps in Visual Studio, there are a few requirements, such as:

  • Visual Studio 2015, 2017, 2019 or greater, if available
  • Azure SDK
  • Azure Logic Apps Tools for Visual Studio Extension (if using VS)
  • An active Azure subscription
  • Time, will and patience.

After you have all this installed, you can begin to create and let your creativity flow!

We’ll start from scratch. Open you VS and start a new Project, by selecting the Azure Resource Group C# template and the Logic App template after that.

You will end with a new Project, and Solution if it’s the case, with 3 files. The PowerShell file is the deployment script that VS uses to automate the ARM deployment. Only in a special case do you need to fiddle with this file.

The other two files are the Logic App code and the Parameters file. You will need to create a new one, to be used as a Template for the Azure Pipeline. So go ahead and copy the Parameters file and change the name to LogicApp.parameters.template.json .

You should end with something like this.

This Parameters Template file will contain our Tokens, which will be replaced in the Pipeline using the “Replace Tokens” Task. In the coming posts, I will explain how it works and why we’re using it.

For the sake of simplicity, I’ll just use the Service Bus connector, where depending on the input, I’ll send a message to the Queue with the provided information.

After creating the connection, you will see that, in the back code, several parameters and a Resource node were created as well, that contain the link and inputs for this connection.

Even when working in a single Resource Group, it is a good practice to prepare this for CI CD, because even though it’s static, connections change and instead of having to re-do all of it, you just need to re-deploy the pipeline with the new configurations.

We will not be making any changes to the Resource node, but to the action path and parameters. This will define that instead of having a fixed value, it will point to the parameter itselft, making it possible to have an ARM parameter configurable in the Pipeline.

Author: Pedro Almeida

Pedro Almeida is a Senior Integration Developer at Devscope, working with Logic Apps, BizTalk, and other related products. Although he started his career as a Dynamics CRM Consultant, Integrations quickly caught his eyes and has made it his primary area of interest and work. Since then, Pedro has worked with customers from very different areas, from Retail to Banking to Governmental Services and others.

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