How to create lambdas?

[Justin Abrahms]

Hi.

I attempted to create a lambda with this service, but it complained about missing IAM permissions. I didn't see an IAM port listed for configuring those permissions. Perhaps I'm missing something about how to configure IAM roles?

Thanks, -justin

[Waldemar Hummer]

Hi,

Can you pull the latest version of LocalStack and then try this:

• Create a file lambda.py with the following content:

def handler(event, context):
    print('test')
    return {'foo': 'bar'}

• Create a Lambda zip file and upload it to the LocalStack API on localhost:4574:

zip lambda.zip lambda.py
aws --endpoint-url=http://localhost:4574 lambda create-function --function-name=f1 --runtime=python2.7 --role=r1 --handler=lambda.handler --zip-file fileb://lambda.zip

• Execute the Lambda function:

aws lambda --endpoint-url=http://localhost:4574 invoke --function-name f1 result.log

Then you should see the following:

1. The aws command line prints a 200 status code message
2. The terminal in which you have LocalStack running prints "test"
3. A file results.log gets created with the return value of the Lambda function

Please note that currently only Lambdas written in Python are supported.

[Waldemar Hummer]

@justinabrahms can you confirm that adding and running Python Lambdas works for you, so we can close this off? Please test with the most recent version. Thanks

[Adam White]

@w_hummer The code worked for me, but it broke the web interface.

Is python currently the only available Lambda runtime? My attempt with nodejs43 only ended in failure. :(

[Waldemar Hummer]

Fixed the Lambda UI issue in this PR: https://bitbucket.org/atlassian/localstack/pull-requests/36 The version hasn't been bumped yet, though. Will bump the version and push a new Docker image soon (probably tomorrow).

@whiteadam Unfortunately, Python is currently the only supported runtime. There has been a proposal here to use a Docker runtime environment that supports different languages: https://github.com/atlassian/localstack/issues/27 It is currently not high up in the priority list on our end, but if you get a chance to look into this - a pull request would be highly appreciated!

[Justin Abrahms]

Confirmed that I now get a non-IAM oriented error. :) I have another error which is that "handler" is a hardcoded value for my function, which I've named lambda_handler in my code. I can just edit the source code to make this work on my end. Unfortunately, corporate OSS guidelines mean it will be unlikely I can contribute a fix for this.

[rsrestha]

Hi,

I was trying to run a lambda on localstack.

But when I enter the following command:

aws --endpoint-url=http://localhost:4574 lambda create-function --function-name=f1 --runtime=python2.7 --role=r1 --handler=lambda.handler --zip-file fileb://lambda.zip

(For uploading the lambda)

It prompts the following: Unable to locate credentials. You can configure credentials by running "aws configure".

[Patrick Barnes]

Doesn't work for me if I try node8.10: https://bitbucket.org/atlassian/localstack/issues/63/creating-node810-lambdas-doesnt-work

[Trung Ly]

@w_hummer Your sample is neat and straight forward. Everything looks good to me expect test isnt printed out in console. do you have any ideas?