v0.18.0+ regression with batched lambda events

This line got introduced in v0.18.0 that assumes that the event object will always be a dict, but there are cases where the lambda event object can be a List[dict].

BatchInvoke events with AppSync [1] are the ones that I’m running up against right now after trying to upgrade the sdk. Anytime I invoke the lambda with a resolver configured with BatchInvoke, the lambda function fails right away (and without a sentry error, which is understandable…but made finding this a real pain)

[ERROR] AttributeError: 'list' object has no attribute 'get'
Traceback (most recent call last):
  File "/var/task/sentry_sdk/integrations/aws_lambda.py", line 106, in sentry_handler
    headers = event.get("headers", 
{}
)

[1] https://docs.aws.amazon.com/appsync/latest/devguide/resolver-mapping-template-reference-lambda.html#request-mapping-template

[untitaker]

We are working on a fix.

[lobsterkatie]

Great, thanks!

And yup - have seen that page, but wasn’t sure if multiple entries inside of event meant there might be multiple context objects. But the two “contexts” being unrelated makes more sense now, as the one in your mapping template calls upon properties not listed on that spec page for the passed context object. Them being independent also explains how in your mapping template, there seemed to be one $context per record, whereas you’ve just confirmed that there’s only one passed context object per batch request.

About to push a fix.