WebJobs & Azure Functions in modern and Serverless applicationsParis PolyzosSoftware Engineer at ZuluTrade IncMicrosoft Azure MVP

Paris PolyzosSenior Software EngineerMicrosoft Azure MVP

@ppolyzosppolyzos.comAzureHeads.gr

ns 2016The ZuluTrade Group

WebJobs, Azure Functions in modern Serverless applications

Goals

3

• What,whenandhowtousethe“Functions”programmingmodel

• WebJobsOverview• ServerlessComputing• AzureFunctionsOverview

WebJobs, Azure Functions in modern Serverless applications

What is the Functions programming model?

4

•Functionastheunitofwork•Functionsstart,executeandfinish•Functionshaveinputsandoutputs

WebJobs, Azure Functions in modern Serverless applications

Best Practices

5

Functionsshould:• doonething• beidempotent• finishasquicklyaspossible

WebJobs, Azure Functions in modern Serverless applications

How and when to use them?

6

Questions:1. Whatisthatyouwanttodo?2. Whattriggersthefunction?3. DoIneedadditionaldata?4. IsthereoutputIshouldproduce?

Conclude:“When__,get__,do__,andoutput__”.

WebJobs, Azure Functions in modern Serverless applications

Azure WebJobs

7

“AzureWebJobsprovideaneasywaytorunscriptsorprograms,ondemand,continuouslyoronaschedule,asbackgroundprocessesonAppServiceWebApps.”

WebJobsSDK providebindingsandtriggersystemwhichworkswithStorageBlobs,Queues,Tables,ServiceBus.

WebJobsExtensions

WebJobs, Azure Functions in modern Serverless applications

WebJobs Demo

8

DEMO

WebJobs, Azure Functions in modern Serverless applications

Serverless Computing

9

“Serverless architectures refer to applications that significantly depend on third-party services (knows as Backend as a Service or "BaaS") or on custom code that's run in ephemeral containers (Function as a Service or "FaaS")”

Martin Fowler

Benefits• ReducedOperational&DevelopmentCosts• FastandeasyScaling• ReducedPackaging&Deployment

Complexity• Easyscheduling&eventprocessing• Reducedtimetomarket/Experimentation

Drawbacks• Vendorcontrol• ExecutionDuration• UnitTesting• LimitedTooling

WebJobs, Azure Functions in modern Serverless applications

Azure Functions

10

Process events with serverless code• DevelopinanylanguageC#,node.js,F#,Python…• Scheduleevent-driventaskseasily• ExposeFunctionsasHttpAPIendpoints• Payonlyforwhatyouuse• ScaleFunctionsbasedondemand

WebJobs, Azure Functions in modern Serverless applications

Azure Functions Architecture

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BuiltontopofAppService&WebJobsSDK

WebJobs, Azure Functions in modern Serverless applications

Azure Functions Platform & Pricing

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Dedicated&DynamicTiers

Dedicated• Basic,Standard,PremiumAppServiceTiers• Paybasedon#ofreservedVMs• You areresponsibleforscaling

Dynamic• Paybasedon#ofexecutions• Platformresponsibleforscaling• Limits

Pricing(ReservedMemory✕ Duration)+NumberOfExecutions=xxx(GB-s)

WebJobs, Azure Functions in modern Serverless applications

Azure Functions

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DEMO

WebJobs, Azure Functions in modern Serverless applications

WebJobs vs Azure Functions

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CommonPoints

• Same“Functions”Programmingmodel• Supportbindingsfortriggers/inputs/outputs• WebJobsSDKextensionsmodel• Externallibrariessupport• Canrunlocallyandbedebugged• BothprovideruntimetelemetryviaDashboard

WebJobs, Azure Functions in modern Serverless applications

WebJobs vs Azure Functions

15

Programmingmodeldifferences

WebJobs§ Attributesforconfiguringbindings§ Traditional.NETdeveloperexperience(VisualStudio,NuGet,MSBuild)

§ Manyfunctionsperclass§ CanaccessandmanipulatemanycoreSDKfeatures

§ Can’tlistenforHTTPrequests*

AzureFunctions§ C#,Node.js,F#,Python§ Config filesforbindings§ Diversedevelopment(AzurePortal,VSCode)

§ SupportsHTTP

WebJobs, Azure Functions in modern Serverless applications

WebJobs vs Azure Functions

16

Hostingmodeldifferences

WebJobs• SupportsHostconfiguration• Buildaconsoleapp• You managescaling• RunstheserviceinthebackgroundofWeb/Mobile/APIapp

• Runsanyconsoleapp(notjustSDKbasedones)

AzureFunctions§ Limitedcontroloverthehost§ Justgiveityourcode/config§ Functionappownsthewholehost

§ Scaleismanagedforyou§ OnlyrunsAzureFunctionsstuff–nootherthings

Thank You

https://azure.microsoft.com/en-us/documentation/articles/websites-webjobs-resources/https://azure.microsoft.com/en-gb/services/functions/www.azureheads.grwww.ppolyzos.com

WebJobs, Azure Functions in modern Serverless applications

Supported Bindings

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Type Service Trigger Input Output

Schedule AzureFunctions ✔

HTTP (RESTorWebHook) AzureFunctions ✔ ✔

BlobStorage AzureStorage ✔ ✔ ✔

Queues AzureStorage ✔ ✔

Tables AzureStorage ✔ ✔

Tables AzureMobileAppsEasyTables

✔ ✔

No-SQLDB Azure DocumentDB ✔ ✔

Streams AzureEventHubs ✔ ✔

PushNotifications AzureNotification Hubs ✔

SaaS Twillio,SendGrid(experimental)

✔