Pragmatic Serverless Microservices with Azure Functions & Co. - more than FaaS Christian Weyer @christianweyer CTO 

2 § Founder & CTO at Thinktecture AG § Personal focus on § Mobile & web-based application architectures § Interoperability, cross-device § Pragmatic end-to-end solutions § Cloud-native & serverless architectures § Independent Microsoft Regional Director § Microsoft MVP for ASP.NET (Architecture) ASPInsider, AzureInsider § Google GDE for Web Technologies [email protected] @christianweyer https://www.thinktecture.com Christian Weyer More than FaaS Pragmatic Serverless Microservices with Azure Functions & Co. 

3 § Microservices, Nanoservices § Serverless in Azure § Serverless Compute: Azure Functions § Serverless Messaging: Azure Service Bus § Summary Pragmatic Serverless Microservices with Azure Functions & Co. More than FaaS Our Journey Today 

How large is small? Microservices More than FaaS Pragmatic Serverless Microservices with Azure Functions & Co. 4 

Single Responsibility § Focused around business domain § ‘Small’ Isolation § Well-defined technology-agnostic API § Mobility § Choice of technology Autonomy § Exclusive state (data storage) Decoupling § Asynchronous communication § Really, always? Pragmatic Serverless Microservices with Azure Functions & Co. More than FaaS (Some) Principles of Microservices 5 

Pragmatic Serverless Microservices with Azure Functions & Co. More than FaaS Sample Architecture – Shopping Order Monitoring 6 Orders Service Products Service Shipping Service AuthN Service Order Monitoring SPA Shopping Web Site (simulated by Postman) 1 - authenticate 2 - register for push 3 - send new order 5 - new order created push 6 - get updated orders 4 - processing order… 

A different approach Serverless More than FaaS Pragmatic Serverless Microservices with Azure Functions & Co. 7 

8 § We can choose from a continuum § VM ➔ § Containers ➔ § Orchestrators ➔ § PaaS ➔ § Serverless Pragmatic Serverless Microservices with Azure Functions & Co. More than FaaS Evolution to Cloud Compute Continuum PaaS IaaS On-Premises Serverless 

9 What Do We Want – With & From Serverless? Programming Model (FaaS) § Event-driven § Stateless § Service-full Operational Model § Fully managed § Automatically scaling § Usage priced More than FaaS Pragmatic Serverless Microservices with Azure Functions & Co. 

10 § Serverless Compute → Azure Functions § Serverless Database → Azure Cosmos DB § Serverless Storage → Azure Storage § Serverless Realtime → Azure SignalR Service § Serverless Events → Azure Event Grid § Serverless Messaging → Azure Service Bus § Serverless Workflows → Azure Logic Apps Azure Durable Functions § Serverless IoT → Azure IoT Hub § Serverless Analytics → Azure Application Insights § Serverless Containers → Azure Container Instances Pragmatic Serverless Microservices with Azure Functions & Co. More than FaaS Serverless in Azure (my personal choice) 

Pragmatic Serverless Microservices with Azure Functions & Co. More than FaaS Sample Architecture – Shopping Order Monitoring: Serverless 11 Orders Service Products Service Shipping Service AuthN Service Order Monitoring SPA Shopping Web Site (simulated by Postman) Azure Function App – C# Azure Function App - C# Azure Function App - JS Azure Function App - Java Azure Service Bus Azure Blob Storage Azure SignalR Service Azure Table Storage Azure Cosmos DB Identity Server 

Azure Functions Serverless Compute More than FaaS Pragmatic Serverless Microservices with Azure Functions & Co. 12 

13 § Azure Functions: code being triggered by an event § Use Façade pattern for your business logic § Basic principles enable powerful use cases § Events ➔ Triggers & Bindings § Two ways of operation § Cost-optimized, automatic scale (Consumption plan) § Always-on (App Service plan) § V2 Runtime built on .NET Core § Available for self-hosting § Local tooling & runtime § Multiple language bindings supported Pragmatic Serverless Microservices with Azure Functions & Co. More than FaaS Azure Functions: Functions-as-a-Service 

14 § Incoming event triggers function § Input bindings enable easy access to data from various data sources § Output bindings offer easy access to outbound data sinks Pragmatic Serverless Microservices with Azure Functions & Co. More than FaaS Functions Triggers & Bindings Your code logic Runtime Azure Function HTTP Trigger Storage Input Binding Push Notification Output Binding Database Output Binding Email Output Binding Example 

15 Functions Triggers & Bindings in Code More than FaaS Pragmatic Serverless Microservices with Azure Functions & Co. 

16 § Azure Functions host instances are automatically managed § Spawning new instances → cold start § Reusing existing instances → warm start Pragmatic Serverless Microservices with Azure Functions & Co. More than FaaS Scalability: Cold vs. Warm Start https://azure.microsoft.com/en-us/blog/understanding-serverless-cold-start/ 

Azure Service Bus Serverless Messaging More than FaaS Pragmatic Serverless Microservices with Azure Functions & Co. 17 

18 § Queues & Topics § Reliable asynchronous communication § Rich features for temporal control § Routing and filtering § Transactions § Convoys & Sessions (related messages with state) § Bindings for Azure Functions available Pragmatic Serverless Microservices with Azure Functions & Co. More than FaaS Service Bus: Messaging-as-a-Service 

19 Sender § Sender sends message to queue § Queue ACKs receipt § Receiver connects to queue & retrieves message § Receiver ACKs complete (or other action) Pragmatic Serverless Microservices with Azure Functions & Co. More than FaaS Service Bus Queues Receiver 

Wrapping up More than FaaS Pragmatic Serverless Microservices with Azure Functions & Co. 20 

Single Responsibility § Focused around business domain § ‘Small’ unit ➡ Dedicated Azure Functions App ➡ Dedicated Azure DevOps Pipeline Isolation § Choice of technology ➡ .NET, Java, node.js, Python supported § Well-defined technology-agnostic APIs ➡ HTTPS, AMQP, MQTT, custom § Mobility ➡ Portable runtime ➡ Can use Docker, k8s with Functions ➡ Easily deploy & run in Cloud Autonomy § Exclusive state (data storage) ➡ Use separate Azure Storage, Azure SQL, Azure CosmosDB instances Decoupling § Asynchronous communication ➡ Azure Service Bus with queues or topics & subscriptions Pragmatic Serverless Microservices with Azure Functions & Co. More than FaaS (Some) Principles of Microservices – with Serverless Azure 21 

22 § Serverless (as FaaS) is just one option in the Cloud Continuum § Always think about the use cases and requirements § We can build Microservices with FaaS today – for greenfield, if the granularity fits § Today limits like programming model lock-in, cold starts § Serverless Azure offers various solutions in the Serverless space § Storage § Functions § Service Bus § SignalR Service & more § Azure Functions is way more than just a Web API framework – preferred for async decoupled processing Pragmatic Serverless Microservices with Azure Functions & Co. More than FaaS Summary 

23 Remember: there are NO servers! https://twitter.com/jeffhollan/status/1030244102082682880 More than FaaS Pragmatic Serverless Microservices with Azure Functions & Co. 

Chris&an Weyer, Thinktecture AG @chris&anweyer chris&[email protected] h:ps://github.com/thinktecture/serverless-microservices