CODEWITHSUNDEEP
pythonamazon-web-servicesaws-lambda
Yang L
Yang L

Reputation: 469

No return value from an AWS Lambda

I have a AWS Lambda function that passes a set of parameters to another function; after some processing, this second function should return a value, but for some reason the first function does not receive that value.

This is the caller function:

import boto3

lam = boto3.client('lambda')

def lambda_handler(event, context):
  payload={}
  payload['key1'] = 'Test Value'
  response=lam.invoke(FunctionName='callee', InvocationType='RequestResponse', Payload=json.dumps(payload))
  print(response)

This is callee function:

def lambda_handler(event, context):
    print('value1=' + event['key1'])
    return event['key1']

The callee function prints the value as expected, but caller function does not receive the return from callee.

How can I fix this? Thank you.

Upvotes: 1

Views: 2041

Answers (1)

John Rotenstein
John Rotenstein

Reputation: 270254

The response object comes back as:

{
    'ResponseMetadata': {...}, 
    'StatusCode': 200, 
    'ExecutedVersion': '$LATEST', 
    'Payload': <botocore.response.StreamingBody object at 0x7f34aea2d240>
}

You can then extract the return value via:

print(response['Payload'].read())

Upvotes: 2

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