CODEWITHSUNDEEP
amazon-web-servicesaws-lambdaboto3
Manuel
Manuel

Reputation: 802

Getting AWS Lambda response when using boto3 invoke()

Im currently writing a python script that interacts with some AWS lambda functions. In one of the functions, my response contains a list which I need in my script.

Problem is that when I use the invoke() function, the response is a json which contains request information.

response = aws_lambdaClient.invoke(FunctionName = 'functionName', Payload = payload)

The function that im using has this as a return

return {'names': aList, 'status': 'Success!'}

If I print out the response, I get this:

{'ResponseMetadata': {'RequestId': 'xxxxxxxxx', 'HTTPStatusCode': 200, 'HTTPHeaders': {'date': 'Thu, 07 Nov 2019 14:28:25 GMT', 'content-type': 'application/json', 'content-length': '51', 'connection': 'keep-alive', 'x-amzn-requestid': 'xxxxxxxxxx', 'x-amzn-remapped-content-length': '0', 'x-amz-executed-version': '$LATEST', 'x-amzn-trace-id': 'root=xxxxxxxxx;sampled=0'}, 'RetryAttempts': 0}, 'StatusCode': 200, 'ExecutedVersion': '$LATEST', 'Payload': <botocore.response.StreamingBody object at 0x0000023D15716048>}

And id like to get

{'names': aList, 'status': 'Success!'}

Any idea on how can I achieve this? Or should I find another way of getting the data (Maybe putting the list i need in an s3 bucket and then getting it from there).

Upvotes: 5

Views: 15667

Answers (2)

Vaibhav Malushte
Vaibhav Malushte

Reputation: 171

You must be using InvocationType='Event', You must use InvocationType='RequestResponse',

As per the document

RequestResponse (default) – Invoke the function synchronously. Keep the connection open until the function returns a response or times out. The API response includes the function response and additional data.

Event – Invoke the function asynchronously. Send events that fail multiple times to the function's dead-letter queue (if one is configured). The API response only includes a status code.

DryRun – Validate parameter values and verify that the user or role has permission to invoke the function.

Upvotes: 2

Richard
Richard

Reputation: 3394

Manuel,

as mentioned, the return info is inside the Payload element in the returned json. Payload is a boto3 object type that you need to access it's contents through it's read() method.

The code I used to get the python dictionary that I return from my lambda functions is this:

payload = json.loads(response['Payload'].read())

statusCode = payload.get('statusCode')
message = payload.get('message')
results = payload.get('results')

Upvotes: 19

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