Real-time in no time (and costs?) with Azure Functions, Cosmos DB & SignalR Christian Weyer @christianweyer https://www.thinktecture.com/en/christian-weyer CTO, Thinktecture AG 

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 Azure, Developer Tools ASPInsider, AzureInsider § Google GDE for Web Technologies [email protected] @christianweyer https://www.thinktecture.com Christian Weyer Real-time in no time (and costs?) With Azure Functions, Cosmos DB & SignalR 

3 § Serverless Compute: Azure Functions § Serverless Messaging: Azure Service Bus § Serverless Database: Azure CosmosDB § Serverless Real-time: Azure SignalR Service With Azure Functions, Cosmos DB & SignalR Real-time in no time (and costs?) Serverless-all-the-things™ - Today: Greenfield 

With Azure Functions, Cosmos DB & SignalR Real-time in no time (and costs?) Sample Architecture – Shopping Order Monitoring 4 

With Azure Functions, Cosmos DB & SignalR Real-time in no time (and costs?) Sample Architecture – Shopping Order Monitoring 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… 5 

With Azure Functions, Cosmos DB & SignalR Real-time in no time (and costs?) Sample Architecture – Shopping Order Monitoring: Serverless Azure 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 6 

Azure Functions Serverless Compute Real-time in no time (and costs?) With Azure Functions, Cosmos DB & SignalR 7 

8 § Azure Functions: code being triggered by an event § Use Façade pattern for your business logic § Basic principles enable powerful use cases § Events ➔ Triggers & Bindings § Cost-optimized, automatic scale (Consumption plan) § V2/V3 Runtime built on .NET Core § Available for self-hosting § Local tooling & runtime § Multiple language bindings supported With Azure Functions, Cosmos DB & SignalR Real-time in no time (and costs?) Azure Functions: Functions-as-a-Service 

9 § Incoming event triggers function § Input bindings enable easy access to data from various data sources § Output bindings offer easy access to outbound data sinks With Azure Functions, Cosmos DB & SignalR Real-time in no time (and costs?) 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 

10 Functions Triggers & Bindings in Code Real-time in no time (and costs?) With Azure Functions, Cosmos DB & SignalR 

With Azure Functions, Cosmos DB & SignalR Real-time in no time (and costs?) Sample Architecture – Shopping Order Monitoring: Azure Functions 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 11 

12 Azure Cosmos DB Serverless Database Real-time in no time (and costs?) With Azure Functions, Cosmos DB & SignalR 

13 § Globally distributed, elastically scalable § Fully managed by Azure § Serverless mode in preview § Multi-model database § Key-value, document, graph § Multiple APIs § DocumentDB, with SQL & JS APIs § MongoDB API § Cassandra API § Table Storage API § Graph Database with Gremlin API Real-time in no time (and costs?) Cosmos DB: NoSQL Database with Many Faces With Azure Functions, Cosmos DB & SignalR 

With Azure Functions, Cosmos DB & SignalR Real-time in no time (and costs?) Sample Architecture – Shopping Order Monitoring: Azure Cosmos DB 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 14 

15 § Building event-driven architectures with Cosmos DB § Listening to Azure Cosmos DB collection for any changes § Inserts, updates, soft-deletes § Subscribe to collection changes Real-time in no time (and costs?) Cosmos DB Change Feed With Azure Functions, Cosmos DB & SignalR 

Azure Service Bus Serverless Messaging Real-time in no time (and costs?) With Azure Functions, Cosmos DB & SignalR 16 

17 § 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 With Azure Functions, Cosmos DB & SignalR Real-time in no time (and costs?) Service Bus: Messaging-as-a-Service 

18 Sender § Sender sends message to queue § Queue ACKs receipt § Receiver connects to queue & retrieves message § Receiver ACKs complete (or other action) With Azure Functions, Cosmos DB & SignalR Real-time in no time (and costs?) Service Bus Queues Receiver 

With Azure Functions, Cosmos DB & SignalR Real-time in no time (and costs?) Sample Architecture – Shopping Order Monitoring: Azure Service Bus 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 19 

20 Azure SignalR Service Serverless Real-time Real-time in no time (and costs?) With Azure Functions, Cosmos DB & SignalR 

21 § Real-time messaging is a wanted feature nowadays § Dashboards and monitoring apps § Collaborative apps § Apps that require notifications § ASP.NET Core SignalR provides programming model for bi-directional ‘method invocation’ § Via WebSockets, SSE or Long Polling § Various client libs available § Wanted: “SignalR messaging & scale-out”-as-a-Service ➔ Azure SignalR Service § Azure Functions bindings available for accessing SignalR Service With Azure Functions, Cosmos DB & SignalR Real-time in no time (and costs?) Azure SignalR Service 

With Azure Functions, Cosmos DB & SignalR Real-time in no time (and costs?) Sample Architecture – Shopping Order Monitoring: Azure SignalR 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 22 

Wrapping up Real-time in no time (and costs?) With Azure Functions, Cosmos DB & SignalR 23 

24 § Completely scriptable with e.g. Terraform § No need to touch servers, or portals § You need check and measure early § Serverless pricing can bite you… § Check out pricing – and do the math § https://azure.microsoft.com/en-us/pricing/details/functions/ § https://azure.microsoft.com/en-us/pricing/details/cosmos-db/ § https://azure.microsoft.com/en-us/pricing/details/service-bus/ § https://azure.microsoft.com/en-us/pricing/details/signalr-service/ With Azure Functions, Cosmos DB & SignalR Real-time in no time (and costs?) Serverless! At “no cost”? 

Christian Weyer, Thinktecture AG @christianweyer [email protected] https://github.com/thinktecture/serverless-microservices