A visual representation of the solution is illustrated in Figure 4. Push based model, based on HTTP calls (both ingoing and outgoing) Event Grid has an available endpoint where you can send events (http post). Event Grid connects data sources and event handlers. To subscribe to Azure Event Grid topic, ASP.NET Core API project with the above controller needs to be deployed to Azure accessible location. Because I plan to test locally, I need to echo back the validation code for Event Grid to acknowledge the function as a valid endpoint. For this design to work, each service must contain some basic logic about the others to communicate. I’ll leverage both eventType and subject soon when I create the subscriptions. Contact him on Twitter: @dbarkol or through email at dabarkol@microsoft.com. Event Grid allows you to speed automation and simplify policy enforcement. I can spend a lot more time discussing these distinctions and in addition how to select the appropriate messaging service on Azure, however, that’s out of the scope of this article. If you haven’t used Cloud Shell before, I highly recommend it. Let’s start the function from Visual Studio so that it runs locally on port 7071. You can use these resources to build an entirely serverless app architecture, or create a hybrid solution that interacts with other cloud resources and on-premises servers. This defensive programming approach is highly recommended when exposing endpoints to other services. As events occur, they’re published to an endpoint called a topic that the Event Grid service manages to digest all incoming messages. For authorization, I add an item in the header called aeg-sas-key—it’s value is one of the access keys generated when the topic is created. Let’s say that within an organization, the same employee has requested to change their mailing address. The payload for this event may resemble the contents of Figure 5. Intelligent, serverless bot service that scales on demand, Build, train and deploy models from the cloud to the edge, Fast, easy and collaborative Apache Spark-based analytics platform, AI-powered cloud search service for mobile and web app development. In this article, I addressed a common application integration scenario. Subject and eventType give context to the event. I’d like to show you how to do this locally, from Visual Studio. Publishers assign relevant information about the event itself inside this property. Connect cloud and on-premises infrastructure and services, to provide your customers and users with the best possible experience. For example, Event Grid can notify Azure Automation when a virtual machine is created, or a SQL Database is spun up. Event Grid is a key component that acts as a main event event processor and contains: Topics are azure resources that represent components that generate events. New Employee Equipment Order is an Azure Function that will subscribe to events for new employees in the Engineering department. For this situation, I want to specifically subscribe to events for recently added employees. Events vs Messages When designing an event-based application it is important to understand the difference between event-based applications and message-based applications. For example, if an employee is promoted within an organization and a message is sent to instruct his new manager to fill out a form, then it carries with it a specific purpose or intent. Figure 2 highlights the reversal of dependencies for the HR department solution by introducing this principal concept. Each message will contain information about the employee, her department and the type of event. Let’s explore them here. Our first handler will be an Azure Function. It allows you to choose the Azure service or resource that you want to be notified about. Azure Event Grid documentation Learn how to use Azure Event Grid to react to relevant events across both Azure and non-Azure services in near-real time fashion. Event Grid connects your app with other services. Pub/Sub queues and GUIs are just a few of the examples that leverage this idea of reacting to events that happen in an organization, application or system. In this post you will find a step by step guide to build a real-time event viewer for Azure Event Grid based on a serverless SignalR service. For example, use Event Grid to instantly trigger a serverless function to run image analysis each time a new photo is added to a blob storage container. Most examples walk through the creation of a Function using the Azure Portal—which is super-easy and quick. “The Global Azure Bootcamp is community at its finest. It sends HTTP requests as notifications. Unlike many other Azure services, there’s no Event Grid namespace that needs to be provisioned or managed. The key reasons to choose Event Grid are In the New Project dialog box, select the HTTP trigger option and keep the default values. Figure 3, taken from the Event Grid overview documentation (bit.ly/2qhaj9q), illustrates several of the publishers and handlers that can be used with Event Grid today. The last step sends an email to the employee. Selecting Microsoft.EventGrid.topics as the resource type will allow me to pick from the custom topics in the subscription. In this design we use a sustainable design pattern of priority processing. The list of services on Azure that integrate with Event Grid is growing, with many more on the horizon. Create the next generation of applications using artificial intelligence capabilities for any developer and any scenario. One architecture pattern that is an immediately obvious fit for Azure Event Grid is a Serverless, event-based … This will provide an endpoint to publish custom events from the HR application. It uses the properties that were retrieved from the second step to populate the recipient address and subject fields of the email.   Event Grid is more like a router for events. Details on how to use the Cloud Shell can be found at bit.ly/2CsFtQB. Also notice that neither the prefix nor suffix filters are used because the subscriber wants to be notified for each occurrence, regardless of the department: Last, remember that the endpoint for the event subscription must be secure. Figure 7 Creating an Event Subscription from the Portal. I’ll be speaking about Azure Event Grid and how it can be used in a serverless architecture in the cloud. Thanks to the following Microsoft technical experts for reviewing this article: Bahram Banisadr and Dan Rosanovsanova The address should look something like https://d69f6bed.ngrok.io, but with a different subdomain each time the ngrok command is executed. An event is created by a publisher such as a Blob Storage account, Event Hubs or even an Azure subscription. I’ll publish events to a custom topic and then subscribe to the events using several different handlers. included-event-type (Event Types) is an optional list of event types to subscribe to. To retrieve the keys, you can list the ones associated with the topic. Event subscriptions are simply associated with a topic. Today, we’re finally enabling that feature in public preview in all public regions except East US, West US, and West Europe. These events can be used to automatically check that service configurations are compliant, put metadata into operations tools, tag virtual machines or file work items. Event publishers aren’t limited to services on Azure. These dependencies create challenges, not only in terms of scale, but also due to the fact that this logic is scattered across the architecture. This will pave the way for more production-ready code. We use events in many of our integration and serverless architectures. This will include events for new and removed employees in the organization. Azure Event Grid is a fully managed event routing service that went into general availability on the 30 th January 2018. If the event handler endpoint is publicly accessible and encrypted by Transport Layer Security, then messages can be pushed to it from Event Grid. Later in the article I’ll use the same structure, with some differences in the values, as when an employee leaves the organization. Easily run containers on Azure without managing servers. Event Grid has an inbuilt support structure for events coming from the different Azure services, like blobs storage and resource groups. Event Grid will send to its subscribers two types of requests—SubscriptionValidation and Notification—that you can identify by inspecting a value from the header. In this chapter you learned about the Azure serverless platform that is composed of Azure Functions, Logic Apps, and Event Grid. Azure Event Grid is a new, fully managed service that supports the routing of events by utilizing a publisher-subscriber model. subject-begins-with (Prefix Filter) is an optional argument that filters based on the prefix of the subject field in the events. Azure Event Grid. Before I dive into some code and build out a solution that highlights some of these features, lets distinguish between an event and a command. That architecture uses Logic Apps to orchestrate workflows and API Managementto create catalogs of APIs. Service Bus is a secure, reliable message broker. Azure Event Grid is agnostic to any language or platform. This is purposely done to provide the ability to send multiple events within a request. One of the core tenets of an event-driven architecture is to reverse the dependencies that existing services may have with each other. The event grid supports built-in azure … An Azure Function is connected to Blob Storage through Event Grid, to process images each time a new image is added. This will be the endpoint address for the event subscription. You’ll also need one of the two access keys that were generated for authorization. This key service is what the rest of the article is all about. The location must also be in a region that has the Event Grid service available. The first event I want to publish is for when a new employee joins an organization. Figure 2 A Centralized Service That Reverses Dependencies Between the Other Services. Combined with a serverless data platform such as Azure SQL or CosmosDB, you can build fully managed cloud native applications. Now comes the fun part of subscribing to events. To keep things simple, I’ll be implementing two types of events from the HR system—when an employee is added to an organization and when an employee is removed. For this example, it’s used to deserialize the contents of the request into a strongly typed object. Handlers are registered with Event Grid by creating an event subscription. The code in this article can be found at github.com/dbarkol/AzureEventGrid. If they can post an HTTP request to the Event Grid service, then they’re candidates for sending events. subject is a value, like eventType, that’s available to provide additional context about the event, with the option of also providing an additional filter to subscribers. Alternatively, you can use Event Grid with Logic Apps to process data anywhere, without writing code. All I must do here is echo back the validation code to acknowledge that I can receive messages: Validation requests can also be identified by their event type: Microsoft.EventGrid.SubscriptionValidationEvent. When performing the earliest stage of the design of an event based system, the best approach is to start with an analysis tool known as Event Storming, which is a collaborative domain discovery exercise wherein a small group of domain experts and one or more facilitators use post-it notes and a very long design space to map out all the events of interest to the domain, what the event pertains to and what triggers the event. subject-ends-with (Suffix Filter) is an optional argument based on a suffix to filter events. The completed version of the Logic App is shown in Figure 8. To test the Logic App, click Run from the designer and send a message to the endpoint like before. Like the Azure Function example, it’s only interested in the added employee event type. Martin justified why he uses Event Grid on his architecture. 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