Fix LambdaInvokeFunctionOperator payload parameter type

[eladi99]

Closes: #32227

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[eladi99]

This PR is meant to solve this issue I've opened: #32227

InvokeLambdaFunctionOperator now accepts bytes or str for its payload argument.
If the value is str, it is converted into bytes using encode() method.

This will fix incompatibility with corresponding boto3 functionality while not breaking the API.

[vincbeck]

You need to update the unit tests. But otherwise, LGTM

[eladkal]

LGTM
Please add test coverage for this change

[eladi99]

@eladkal @vincbeck can you refer me to the tests that should be updated?
Should I add some new once, and if so -- where?

[eladkal]

@eladkal @vincbeck can you refer me to the tests that should be updated? Should I add some new once, and if so -- where?

Sure.

The hook is tested with string payload

airflow/tests/providers/amazon/aws/hooks/test_lambda_function.py

Line 28 in 9d9b159

PAYLOAD = '{"hello": "airflow"}'

you should add a new test / extend existed test to also test byte payload.
I think in this case probably just making the test accept multiple inputs (strings and bytes) using @pytest.mark.parametrize will do the trick (you can find many examples for this in the source code)

The same goes for testing the operator class

airflow/tests/providers/amazon/aws/operators/test_lambda_function.py

Line 77 in 38b901e

payload=json.dumps({"TestInput": "Testdata"}),

[eladi99]

@eladkal pls take a another look

[eladkal]

Static checks are failing

[boring-cyborg]

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