Add max concurrency support for AWS Lambda functions when using AWS SQS as an event source

[htxiong]

Use-case description

12 Jan 2023 AWS introduced maximum concurrency of AWS Lambda functions when using Amazon SQS as an event source (see release announcement here and compute blog from AWS)

And Serverless started to support it around 3 weeks. PR

I suggest we should define max concurrency in Lift.

Example Config

    alarm: engineering@xxx.com
    batchSize: 1
    maxRetries: 5
    maxConcurrency: 10
    worker:

Implementation Idea

Add the configuration for maximumConcurrency and modify Queue.ts. ( e.g. after this line)

this.configuration.worker.events = [
            // Subscribe the worker to the SQS queue
            {
                sqs: {
                    arn: this.queue.queueArn,
                    batchSize: batchSize,
                    maximumBatchingWindow: maximumBatchingWindow,
                    maximumConcurrency: maximumConcurrency
                    functionResponseType: "ReportBatchItemFailures",
                },
            },
        ];

[mnapoli]

That is 100% a good idea, thanks for opening this!

I'm wondering if maximumConcurrency shouldn't go one indentation lower, not in the worker but on the "queue" configuration itself, what do you think?

[htxiong]

Yaaas, I will work on a PR.

[htxiong]

@mnapoli can you review this PR for me? https://github.com/getlift/lift/pull/299

[fredericbarthelet]

Released in 1.25.0