Feature request: Expose Response Streaming in Event Handler Public API

[svozza]

Use case

We have added added streaming functionality back in #4476 but didn't expose it because we didn't support function URLs. With the merging of #4714 we now support this lambda integration so should make it available for use.

Solution/User Experience

We should expose a healper function that will turn a router into a stream compatible lambda handler:

export const handler = streamify(app)

This will just be a wrapper around the built in lambda stream function that the lambda run time provides:

function streamify(app: Router) {
  return awslambda.streamifyResponse(async (event, responseStream, context) => {
    const res = await app.resolveStream(convertV2ToV1(event), context, {responseStream});
    console.log(res)
  })
}

Not we also need to provide a fallback for the awslambda.streamifyResponse global so that our unit tests will work. All the streaming unit tests will also need to be updated to use the helper function.

Alternative solutions

Acknowledgment

• This feature request meets Powertools for AWS Lambda (TypeScript) Tenets
• Should this be considered in other Powertools for AWS Lambda languages? i.e. Python, Java, and .NET

Future readers

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[powertools-for-aws-oss-automation]

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[github-actions]

This is now released under v2.29.0 version!