Context
I am creating my first AWS Lambda function in Python from scratch. My function contains async functions, so I declared my handler with the async keyword. But when I deployed and smoke tested in AWS, I received the following error:
{
"errorMessage": "Unable to marshal response: Object of type coroutine is not JSON serializable",
"errorType": "Runtime.MarshalError"
}
Search terms
aws lambda python async handler
Helpful link
https://stackoverflow.com/questions/60455830/can-you-have-an-async-handler-in-lambda-python-3-6
Outcome
Apparently AWS Lambda does not support async handler functions in Python. So you are required to call your asynchronous code from a synchronous handler function using this line of code:
asyncio.get_event_loop().run_until_complete(your_async_handler())
