Getting Started with Serverless Architectures using Azure Functions @ TechDays 2017

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Getting Started with Serverless Architectures using Azure Functions MARC DUIKER

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Marc Duiker Lead Consultant Xpirit Netherlands @marcduiker – [email protected]

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Current situation Client PlaceOrder Search ValidateOrder CalculatePrice Orders Products Prices

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Current situation - Problems Client PlaceOrder Search ValidateOrder CalculatePrice Orders Products Prices Expensive infrastructure Performance issues Teams require synced delivery

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POC to redesign – Conditions & Requirements Client PlaceOrder Search ValidateOrder CalculatePrice Orders Products Prices Uneven & spikey workload 2 weeks Limited budget Fault tolerant Independent delivery

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What are serverless architectures?

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1. Application that fully depends on a 3rd party service in the cloud to manage logic and state. Multiple interpretations for Serverless

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2. Application where some code is written by the developer but is run in stateless compute containers that are event-triggered, short lived and fully managed by a 3rd party. Multiple interpretations for Serverless

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• Serverless is a misleading term • Functions as a Service (FaaS) is better “Serverless”

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Traditional n-tier architecture Client PlaceOrder Search ValidateOrder CalculatePrice Orders Products Prices

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Serverless architecture with FaaS Client PlaceOrder Gateway Search Validate Order Calculate Price Temp Storage Perm Storage Products Prices

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Why a serverless architecture?

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What we all want • A responsive application • Regardless of workload • Regardless of failures

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Solution: Reactive Systems Responsive Message driven Resilient Elastic https://www.reactivemanifesto.org/ FaaS enables Reactive Systems

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Serverless architecture with FaaS Client Temp Storage Gateway Search Products PlaceOrder Perm Storage Calculate Price Prices Validate Order

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Serverless architecture with FaaS Client Temp Storage Gateway Search Products PlaceOrder Perm Storage Calculate Price Prices Validate Order

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Benefits of FaaS • Focus on code instead of servers & runtime • Node.js , Python, C#, Java … • Reduced operational costs • Allows easier experimentation • Shorter time to market

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Benefits of FaaS • Consumption based pricing • Resource consumption & number of executions # Executions / month 2m Time / execution 0.5 sec Time consumption 2m * 0.5 = 1m sec Avg memory consumption 1.5 GB Resource consumption 1.5 * 1m = 1.5m GB-s Resource price* 0.000014 Eur / GB-s Resource costs 1.5m * 0.000014 = 21 EUR Execution price* 0.169 EUR/1m executions Execution costs 2m * 0.169 = 0.34 EUR *Based on Azure Functions consumption plan dd 11 Oct 2017 2 1

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Benefits of FaaS • Automatic scaling • Can reduce compute costs for spikey workloads constant spikey

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Disadvantages of FaaS • Learning curve • Limited execution duration • Startup latency • Development tooling

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FaaS offerings AWS Lambda (2014) Google Cloud Functions (2016) Azure Functions (2016)

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How do Azure Functions fit in?

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What is Azure Functions? “Azure Functions is a serverless compute service that enables you to run code on-demand without having to explicitly provision or manage infrastructure.” https://docs.microsoft.com/en-us/azure/azure-functions/

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What is Azure Functions?

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Function Anatomy: Triggers & Bindings Input Output Trigger Code 1 0-n 0-n Function

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Function Anatomy: Function App Input Output Trigger Code Function Function App Settings

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The rise of the Functions WebJobs Functions

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Differences with WebJobs • Seamless integration with Azure services • Azure Storage (Queues, Blobs) • Service Bus (Queues, Topics) • CosmosDB • Event Hubs • Webhooks • Timer • Consumption based pricing • Improved automatic scaling

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Automatic scaling

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Azure Functions Limitations • Max execution duration: 10 min (default 5 min) • Available memory: 1.5 GB

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Developing Azure Functions

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• Function scripts - Directly in the portal - Visual Studio Code • Compiled Functions - Visual Studio 2017 with Azure Function Tools Developing Functions

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Demo: Developing Function Scripts

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Benefits of Compiled Functions: • Enjoy the VS IDE features • Local debugging • Easier package management • Configure CI/CD pipelines • Reduce cold start time Developing in Visual Studio

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Demo: Developing Compiled Functions

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User uploads image Image requires validation Image needs to be analyzed Analysis result need to be stored Use case

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Solution using Azure Functions & Queues images input images to analyze images too large analysis results to store validate analyze store blob DB

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Solution using Azure Functions & Queues Upload images images input images to analyze images too large analysis results to store validate analyze store blob DB

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Solution using Azure Functions & Queues Validate images images input images to analyze images too large analysis results to store validate analyze store blob DB

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Solution using Azure Functions & Queues Analyze images images input images to analyze images too large analysis results to store validate analyze store blob DB

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Solution using Azure Functions & Queues Store analysis data images input images to analyze images too large analysis results to store validate analyze store blob DB

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Solution using Azure Functions & Queues Scope of the demo images input images to analyze images too large analysis results to store validate analyze store blob DB

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Demo: Multiple Functions in one App

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Demo data

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Solution using Azure Functions & Queues Start situation images input images to analyze images too large analysis results to store validate analyze store blob DB 3 3

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Solution using Azure Functions & Queues End situation images input images to analyze images too large analysis results to store validate analyze store blob DB 3 1 2

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Demo: Doing the magic

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✓ Develop function using the Azure portal ✓ Develop function using Visual Studio ✓ Multiple functions in one Function App ✓ Microsoft Azure Storage Explorer ✓ Function App Logs Developing Functions Demos

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Deploying Azure Functions

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Edit & save scripts in Portal Publish from Visual Studio Deploy straight from source control Deploy from VSTS Deploying Functions

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Demo: Deploying Functions

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✓ Configure deployment using Azure Portal ✓ Configure deployment using VSTS Deploying Functions Demos

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Other scenarios

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Currently you need to provide a message queue to chain functions. Function Chaining & Durable Functions

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Function Chaining & Durable Functions https://azure.github.io/azure-functions-durable-extension/ Durable Functions will use Orchestrator and Action functions making it easier for developers to chain functions.

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Use Functions as Actions Functions & Logic Apps

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Use an API gateway to manage your Functions API Gateway Client PlaceOrder Search Validate Calculate Temp Storage Perm Storage Products Gateway

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Marc Duiker Lead Consultant Xpirit Netherlands @marcduiker – [email protected] Go and discover endless possibilities with Azure Functions! https://github.com/marcduiker/ demos-serverless-architectures-functions/