Python Lambda Template

Volatrade's opinionated Python3 lambda template

To use this template, just make a new repository on github.com, click the "Use Template" button, name your new function and you're ready to go!

Cron job setup steps

Need this function to run every n minutes, hours, days or weeks? Use the following steps to get started

1. First, check your serverless.yml and under function.<function-name>.events you can change the schedule to the interval you want the job to run on.

   Any resource permissions that you'll need must be set within the iamRoleStatement

2. If you aren't running python3.7, install a python version manager such as pyenv

   • You can create a python3.7 virtual environment using something like pyenv virtualenv 3.7.9 <lambda-function-name>
   • Then you can run pyenv local <lambda-function-name> to activate your virtual environment

3. If you have to query a postgres db, read the section below on using psycopg2

4. Make sure you update create_env.sh to look like below, where all private keys should be mapped from this to circleci . These environment variables should exist in circleci.

cat > .env << EOF
SECRET_PASSWORD=${SECRET_PASSWORD}
SUPER_SECRET_HOST=${SUPER_SECRET_HOST}

Using psycopg2

• The only way to run psycopg2 in an AWS Lambda environment is to use a custom built psycopg2 wrapper

• When deploying, we clone the awslambda-psycopg2 repo amd move awslambda-psycopg2/psycopg2-3.7 to psycopg2 and move it to the root of the project to replace psycopg2 with this wrapper that enables it to run on AWS Lambda

• For using psycopg2, reference the deploy script seen here.