How to invoke a function with custom client context?

[nekketsuuu]

On AWS, I'm using Lambda function which receives event data and custom client context. For local testing, I want to run curl and invoke function with custom client context, defined as:

aws-lambda-runtime-interface-emulator/lambda/core/directinvoke/customerheaders.go

Line 15 in 5a79e1e

ClientContext string `json:"Client-Context"`

I dug into codes, and found aws-lambda-rie seems not to add client context to a invoke payload:

aws-lambda-runtime-interface-emulator/cmd/aws-lambda-rie/handlers.go

Lines 96 to 103 in 5a79e1e

	invokePayload := &interop.Invoke{
	ID: uuid.New().String(),
	InvokedFunctionArn: fmt.Sprintf("arn:aws:lambda:us-east-1:012345678912:function:%s", GetenvWithDefault("AWS_LAMBDA_FUNCTION_NAME", "test_function")),
	TraceID: r.Header.Get("X-Amzn-Trace-Id"),
	LambdaSegmentID: r.Header.Get("X-Amzn-Segment-Id"),
	Payload: bytes.NewReader(bodyBytes),
	CorrelationID: "invokeCorrelationID",
	}

So, is there any ways to use custom client context with aws-lambda-rie? Should I send a pull request for this? It seems that Lambda-Runtime-Client-Context header is related to this, but I cannot find a way to use it properly.

Environment: I'm using aws-lambda-rie command in public.ecr.aws/lambda/nodejs:18.2022.12.02.19 image (https://gallery.ecr.aws/lambda/nodejs). Locally, I confirmed my function implementation can receive event data by running curl -XPOST "http://localhost:9000/2015-03-31/functions/function/invocations" -d '{"payload":"hello world!"}', but cannot receive client context by adding Lambda-Runtime-Client-Context header like -H 'Lambda-Runtime-Client-Context: { "foo":"bar" }'. On AWS, my function can receive custom client context.

[nekketsuuu]

I asked AWS Support and received an answer which says there is no ways to pass client context to my function, for now.

Alternatively, as a workaround, if it's possible to change function code, we can set client context in the code if no client context is given.

[valerena]

Still pending actual release with this feature. I'll keep it open until next release.

[mcieno]

@valerena when can we expect v1.19 to be available in public.ecr.aws/lambda/provided:al2 and public.ecr.aws/lambda/provided:al2023?

[valerena]

I reached out to the team in charge of maintaining those images. We'll see what they say