Python script to Lambda function

This is a project that turned the aquabot Python script into an AWS Lambda function.

Basic Setup

• CloudWatch Event trigger cron job in UTC: cron(15 16 * * ? *) - replaces time.sleep() in a while loop.
• No VPC
• Handler: aquabot.lambda_handler
• Role has AWSLambdaBasicExecutionRole and AWSLambdaMicroserviceExecutionRole policies
• Security Group: Outbound 443 only for data.edwardsaquifer.org and twitter.com
• Test event is an empty dictionary: {}
• Can read twitter_creds.json; tested with environment variables and that also worked.

Create a .zip deployment package

The .zip file contains all the code and the additional libraries installed (through pip).

No virtualenv

cd aquabot_lambda
pip3 install -r requirements.txt -t .
zip -qr9 ../lambdapackage.zip .

virtualenv

• Easiest to create virtual environment in the parent folder of the project
• Then add site-packages directory after initially creating the zip folder

virtualenv -p python3 .venv
source .venv/bin/activate
pip install -r aquabot_lambda/requirements.txt

cd aquabot_lambda
zip -qr9 ../lambdapackage.zip .
cd $VIRTUAL_ENV/lib/python3.6/site-packages
zip -qru9 ../../../../lambdapackage.zip .
cd -
deactivate