Azure Durable Functions (2018-06-13)

Azure Nights Melbourne
Paco de la Cruz
Durable Functions
Serverless and Stateful Orchestrations
on Azure

@pacodelacruz
slideshare.net/pacodelac
pacodelacruzag.wordpress.com

Evolution of Application Platforms
On-premises IaaS PaaS Serverless

“Serverless” and its benefits
Event-driven scaling
not resource-driven
Pay only for what
you use
Server abstraction
Focus on value

Azure Functions in a nutshell
Event Triggers Code Outputs
React and get inputs from
a growing list of services
(triggers and input
bindings)
C#, F#,
node.js, Java,
Phyton
Send results to a
growing list of services
(output bindings)

Some challenges of Azure Functions
Manageable Sequencing
+ Error Handling / Compensation
Fanning-out & Fanning-in Http-based
Async Long-running APIs
Human InteractionFlexible Automated Long-running
Process Monitoring
External Events Correlation
Start
Get Status

Durable Function Patterns
1: Function Chaining 2: Fanning-out & Fanning-in 3: Async HTTP APIs
5: Human Interaction4: Monitoring ?: External Events Correlation
Start
Get Status

Durable Functions in a nutshell
Based on
Durable Task Framework
Using Azure Storage
(Fully Managed and Abstracted)
To Implement stateful
workflows-as-code
(C#, F# and Node.js in
preview)
Azure Functions
Extension

Durable Functions Components
Activity Function Activity Function Activity Function
Orchestrator Function
Orchestration Client
Start
Get Status
Send Event
Wait for Completion
Terminate
Stateless
Single Step
Inputs and Outputs
Stateful
Process Manager
Call Activity Functions
Error Handling and Compensation
Checkpointing
Dehydrates during activities
Rehydrates at responses / events

Function Chaining Pattern
public static async Task<object> Run(
[OrchestrationTrigger] DurableOrchestrationContext ctx)
{
try
{
var x = await ctx.CallActivityAsync<object>("F1");
var y = await ctx.CallActivityAsync<object>("F2", x);
return await ctx.CallActivityAsync<object>("F3", y);
}
catch (Exception ex)
{
// error handling / compensation
}
}

Fan-out & Fan-In Pattern
public static async Task<int> Run(
[OrchestrationTrigger] DurableOrchestrationContext ctx)
{
object[] workBatch = await ctx.CallActivityAsync<object[]>("F1");
var tasks = new Task<long>[workBatch.Length];
for (int i = 0; i < workBatch.Length; i++)
{
tasks[i] = ctx.CallActivityAsync<int>("F2", workBatch[i]);
}
await Task.WhenAll(tasks);
long sum = tasks.Sum(t => t.Result);
return sum;
}

Orchestration Client
public static async Task<HttpResponseMessage> Run(
[HttpTrigger(AuthorizationLevel.Function, methods: "post",
Route = "orchestrators/{functionName}")] HttpRequestMessage req,
[OrchestrationClient] DurableOrchestrationClientBase starter, ILogger log)
{
// Function input comes from the request content.
dynamic eventData = await req.Content.ReadAsAsync<object>();
string instanceId = await starter.StartNewAsync("myOrchestrator", eventData);
log.LogInformation($"Started orchestration with ID = '{instanceId}'.");
var res = starter.CreateCheckStatusResponse(req, instanceId);
return res;
}

Durable Functions vs Logic Apps?
vs
Durable Functions Logic Apps
Both allow implementing advanced workflow patterns
C#, F# and JavaScript in preview Visual designer and WDL
Bindings (~ 20 supported) 200+ connectors
Portable Runtime Run only on Azure
Monitoring based on App Insights & APIs Rich monitoring & management tools
Serverless, dedicated and isolated Serverless only
(dedicated in the future [ISE])
blog.mexia.com.au/azure-durable-functions-vs-logic-apps

Additional Resources
Twitter @azurefunctions
Documentation aka.ms/durablefunctions
Live Web Cast aka.ms/azurefunctionslive
Repos github.com/Azure/azure-functions-durable-extension
github.com/Azure/azure-functions-durable-js
Samples github.com/Azure/azure-functions-durable-
extension/tree/master/samples
Pluralsight course app.pluralsight.com/library/courses/
azure-durable-functions-fundamentals

Any questions so far?

Demo 1
Development and Debugging
Furry Models
Cat Application Approval
github.com/pacodelacruz/
DurableFunctions-AzureNights

Orchestration
Function
Start
Send Approval
Request via Email
Create Timer
External
Event
Timer
Expires
WhenAny
Move Blob to
Corresponding Container
End
(Requests
blob container)
(Approved or Rejected
blob container)

Orchestration
Function
Start
Send Approval
Request via Email
Create Timer
External
Event
Timer
Expires
WhenAny
Move Blob to
End
BlobTrigger
Function
HttpTrigger
Process Approval
(Requests
blob container)
blob container)
Orchestration Client Activity Functions
ActivityTrigger
Send Approval
Request via Email
ActivityTrigger
Move Blob to
HttpTrigger
Check Status

Demo 2
Execution & Monitoring on Azure

Orchestration
Function
Start
Send Approval
Request via Slack
Create Timer
External
Event
Timer
Expires
WhenAny
Move Blob to
End
BlobTrigger
Function
HttpTrigger
Process Approval
(Requests
blob container)
blob container)
Orchestration Client Activity Functions
ActivityTrigger
Send Approval
Request via Slack
ActivityTrigger
Move Blob to
HttpTrigger
Check Status

Let your Cat apply!
Great opportunity to get famous!
Send an email to: …
Subject: I want to be a Furry Model!
Attach your cat best picture

Details about the demos:
blog.mexia.com.au/azure-durable-functions-approval-workflow-with-sendgrid
blog.mexia.com.au/azure-durable-functions-approval-workflow-with-slack

Thanks!

Azure Durable Functions (2018-06-13)

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Azure Durable Functions (2018-06-13)