add span links from SQS messages in AWS lambda transactions

[beniwohli]

closes #1473

[beniwohli]

@basepi do you have a real word setup already where we could test this in AWS?

[apmmachine]

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[basepi]

@basepi do you have a real word setup already where we could test this in AWS?

I have a working setup on the receiving end, but not on the sending end. I can probably do something later this week, couple of higher priority things at the moment.

[trentm]

If it helps, here is an SQS payload that we use for Node.js agent tests: https://github.com/elastic/apm-agent-nodejs/blob/main/test/lambda/fixtures/aws_sqs_test_data.json#L26-L37

It started as a real payload... to which I manually added the two conflicting Traceparent message attributes for testing.

[trentm]

And if it helps, here are some AWS CLI commands I used to send SQS messages:

aws sqs create-queue --queue-name trentm-play-queue1
{
    "QueueUrl": "https://sqs.us-west-2.amazonaws.com/627286350134/trentm-play-queue"
}

aws sqs send-message \
    --queue-url "https://sqs.us-west-2.amazonaws.com/627286350134/trentm-play-queue" \
    --message-body 'this is my body' \
    --message-attributes '{
        "astr": {"DataType": "String", "StringValue": "a str value"}
    }'

aws sqs send-message \
    --queue-url "https://sqs.us-west-2.amazonaws.com/627286350134/trentm-play-queue" \
    --message-body 'this is my body' \
    --message-attributes file://send-message.json


       Command:

          aws sqs send-message --queue-url https://sqs.us-east-1.amazonaws.com/80398EXAMPLE/MyQu
eue --message-body "Information about the largest city in Any Region." --delay-seconds 10 --mess
age-attributes file://send-message.json

       Input file (send-message.json):

          {
            "City": {
              "DataType": "String",
              "StringValue": "Any City"
            },
            "Greeting": {
              "DataType": "Binary",
              "BinaryValue": "Hello, World!"
            },
            "Population": {
              "DataType": "Number",
              "StringValue": "1250800"
            }
          }

       Output:

          {
            "MD5OfMessageBody": "51b0a325...39163aa0",
            "MD5OfMessageAttributes": "00484c68...59e48f06",
            "MessageId": "da68f62c-0c07-4bee-bf5f-7e856EXAMPLE"
          }