Book Image

Azure Serverless Computing Cookbook - Third Edition

By : Praveen Kumar Sreeram
Book Image

Azure Serverless Computing Cookbook - Third Edition

By: Praveen Kumar Sreeram

Overview of this book

This third edition of Azure Serverless Computing Cookbook guides you through the development of a basic back-end web API that performs simple operations, helping you understand how to persist data in Azure Storage services. You'll cover the integration of Azure Functions with other cloud services, such as notifications (SendGrid and Twilio), Cognitive Services (computer vision), and Logic Apps, to build simple workflow-based applications. With the help of this book, you'll be able to leverage Visual Studio tools to develop, build, test, and deploy Azure functions quickly. It also covers a variety of tools and methods for testing the functionality of Azure functions locally in the developer's workstation and in the cloud environment. Once you're familiar with the core features, you'll explore advanced concepts such as durable functions, starting with a "hello world" example, and learn about the scalable bulk upload use case, which uses durable function patterns, function chaining, and fan-out/fan-in. By the end of this Azure book, you'll have gained the knowledge and practical experience needed to be able to create and deploy Azure applications on serverless architectures efficiently.
Table of Contents (14 chapters)
13
Index

Reading CSV data using activity functions

In this recipe, we'll retrieve all the data from specific CSV sheets by writing an activity function.

Let's now make some code changes to the orchestration function by writing a new activity function that can read data from a CSV sheet located in the blob container. In this recipe, we'll create an activity trigger named ReadCSV_AT that reads the data from the blob stored in the storage account. This activity trigger performs the following jobs:

  1. It connects to the blob using a function, ReadBlob, of a class named StorageManager.
  2. It returns the data from the CSV file as a collection of employee objects.

Getting ready

Install the following NuGet package in the CSVImport.DurableFunctions project:

Install-Package Microsoft.Azure.Storage.blob

How to do it...

If you think of Durable Functions as a workflow, then the activity trigger function can be treated as a workflow step that takes some kind of...