CODEWITHSUNDEEP
djangoamazon-web-servicesaws-lambda
Xar
Xar

Reputation: 7940

Calling a Django function inside an AWS Lambda

I want to defer some processing load from my Django app to an AWS Lambda.

I'm calling my code from the Lambda like this:

lambda.py:

@bc_lambda(level=logging.INFO, service=LAMBDA_SERVICE)
def task_handler(event, context):
    message = event["Records"][0]["body"]
    renderer = get_renderer_for(message)
    result = renderer.render()
    return result

get_renderer_for is a factory method that returns an instance of the class Renderer:

from myproject.apps.engine.documents import (
    DocumentsLoader,
    SourceNotFound,
    source_from_version,
)
from myproject.apps.engine.environment import Environment

class Renderer:
    def __init__(self, message):
        self.message = message

    def render(self):
        ENVIRONMENT = Environment(DocumentsLoader())
        version_id = self.message.get("version_id")

        try:
            source = source_from_version(version_id)
        except SourceNotFound:
            source = None

        template = ENVIRONMENT.from_string(source)

        if template:
            return template.render(self.message)

        return None


def get_renderer_for(message):
    """
    Factory method that returns an instance of the Renderer class
    """
    return Renderer(message)

In CloudWatch, I see I'm getting this error: module initialization error. Apps aren't loaded yet.

I understand that Django is not available for the Lambda function, right? How can I fix this? How can I make the rest of the project available to the lambda function?

Upvotes: 1

Views: 501

Answers (1)

James Shapiro
James Shapiro

Reputation: 6256

The only two libraries that Lambda supports out of the box are the standard library and boto3.

There are several ways to install external Python libraries for use in Lambda. I recommend uploading them as a Lambda layer. This is a good guide: https://medium.com/@qtangs/creating-new-aws-lambda-layer-for-python-pandas-library-348b126e9f3e

Upvotes: 1

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