Feature request: Provide idempotency at handler level (via Middy middleware and decorator) (FR1)

[ijemmy]

Use case

Description of the feature request

Problem statement
Library users want to add idempotency attribute to the Lambda handler.

Check the design spec for details.

Summary of the feature

• Provide two interface (Middy middleware and decorator ) to make a Lambda handler idempotent
• Cover edge cases described in the design spec
• I can pass the persistence layer as a parameter (that implements the PersitenceLayer interface)

Code examples
See the design spec

Story Checklist (for tracking progress)

• As a developer, I would like to make my Lambda handler idempotent. My handler use TypeScript class and I want to wrap the handler with @idempotent_function() decorator.
• As a developer, I would like to make my Lambda handler idempotent with Middy middleware
• As a developer, I would like to switch my persistence layer to a different implementation, besides the default one (DynamoDB)

Definition of done

• Include unit tests with 100% code coverage (or as much as it makes sense)
• Code documentation (TS doc) on classes and public methods

Related issues, RFCs

#447

Solution/User Experience

See #447

Alternative solutions

N/A

Acknowledgment

• This feature request meets Lambda Powertools Tenets
• Should this be considered in other Lambda Powertools languages? i.e. Python, Java

[saragerion]

Closing this issue as we will break down the unit of work different ones.

[github-actions]

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