python-aws-lambda

A simple example of running a python code snippet serverless using AWS Lambda service via Localstack

How to run

Setup localstack to simulate AWS by docker-compose:

• docker compose up -d

Create a Lambda function:

• Already existing on lambda_function.py

Compress the python code snippet to a zip file:

• zip lambda.zip lambda_function.py

Install awscli-local and awscli:

pip install awscli-local
pip install awscli

Create a new Lambda function:

awslocal lambda create-function \
    --function-name lambda_function \
    --runtime python3.8 \
    --zip-file fileb://lambda.zip \
    --handler lambda_function.lambda_handler \
    --role arn:aws:iam::000000000000:role/lambda-role

Invoke the Function:

awslocal lambda invoke --function-name lambda_function \
    --payload '{"num1": 5, "num2": 15}' output.txt

Check the result:

• cat output.txt

{"statusCode": 200, "body": 20}

Create a Function URL:

awslocal lambda create-function-url-config \
    --function-name lambda_function \
    --auth-type NONE

This will generate a HTTP URL that can be used to invoke the Lambda function. The URL will be in the format http://<XXXXXXXX>.lambda-url.us-east-1.localhost.localstack.cloud:4566

Trigger the Lambda function URL:

curl -X POST \
    'http://iu4s187onr1oabg50dbvm77bk6r5sunk.lambda-url.us-east-1.localhost.localstack.cloud:4566/' \
    -H 'Content-Type: application/json' \
    -d '{"num1": "10", "num2": "10"}'