Chapter 3: Azure Durable Functions

Activity 3: Using a Durable Function to Manage an Email Verification Workflow

1. Create a new function app called VerifyUserEmail in a new folder and install Durable Functions, Cosmos DB, and SendGrid:

   func extensions install -p Microsoft.Azure.WebJobs.Extensions.DurableTask -v 1.6.2
   dotnet add package Microsoft.Azure.WebJobs.Extensions.SendGrid --version 3.0.0
   dotnet add package Microsoft.Azure.WebJobs.Extensions.CosmosDB --version 3.0.2

   

   Figure 3.58: Durable Functions project

2. Add a function called UserAdded using the CosmosDBTrigger. It will all be templated out by VS Code, but the code is here, too:

   using System.Collections.Generic;
   using Microsoft.Azure.Documents;
   using Microsoft.Azure.WebJobs;
   using Microsoft.Azure.WebJobs.Host;
   using Microsoft.Extensions.Logging;
   
   namespace VerifyUserEmail.OrchestrationTriggers
   {
     public static class UserAdded
     {
       [FunctionName("UserAdded")]
       public static void Run([CosmosDBTrigger(
         databaseName: "serverless...