Check out my new course Learn you some Lambda best practice for great good! and learn the best practices for performance, cost, security, resilience, observability and scalability.
I have some exciting news to share with you about the Serverless Step Functions plugin.
One of the main pain points of using the plugin was that you needed to use fully-formed ARNs. We addressed this in v1.18.0 by supporting CloudFormation intrinsic functions
Ref. This makes it possible for you to reference a local function instead.
functions: hello-world: handler: hello-world.handler stepFunctions: stateMachines: myStateMachine: definition: StartAt: HelloWorld States: HelloWorld: Type: Task Resource: Fn::GetAtt: [HelloDashworldLambdaFunction, Arn] End: true
But this is still a leaky abstraction – you have to know how the Serverless framework converts local function names into CloudFormation logical IDs.
Newcomers would often get confused here.
“How did you get the logical ID
I can hardly blame them for not knowing. This is an implementation detail in the Serverless framework, one that you shouldn’t have to care about!
Which is why I’m really happy to tell you that, as of v2.2.0 you can reference local functions using their local names in the state machine definition.
In the above example, when we reference the local function
hello-world we no longer need to use its CloudFormation logical ID
As you can see from the example, it applies when you use either
Fn::GetAtt functions in a
Task state. And it applies to all 3 ways of invoking a Lambda function from a
I specialise in rapidly transitioning teams to serverless and building production-ready services on AWS.
Are you struggling with serverless or need guidance on best practices? Do you want someone to review your architecture and help you avoid costly mistakes down the line? Whatever the case, I’m here to help.
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Here is a complete list of all my posts on serverless and AWS Lambda. In the meantime, here are a few of my most popular blog posts.
- Lambda optimization tip – enable HTTP keep-alive
- You are thinking about serverless costs all wrong
- Many faced threats to Serverless security
- We can do better than percentile latencies
- I’m afraid you’re thinking about AWS Lambda cold starts all wrong
- Yubl’s road to Serverless
- AWS Lambda – should you have few monolithic functions or many single-purposed functions?
- AWS Lambda – compare coldstart time with different languages, memory and code sizes
- Guys, we’re doing pagination wrong