Mailchimp App for LaMetric (Python)

An HTTP endpoint for polling Mailchimp subscriber numbers for an LaMetric Time device. Designed to run on Azure Functions as an HTTP endpoint.

Methods

• getConfirmedSubscribers: returns the confirmed subscribers from Mailchimp.
  • Type: HTTP trigger function.

Deployment

Uses main.bicep to define the Azure resources.

Automatic

Uses Azure ARM and Login GitHub actions to deploy.

AZURE_CREDENTIALS created as per the service principal instructions:

az ad sp create-for-rbac --name "lamsubs-py - GitHub" --sdk-auth --role contributor \
    --scopes /subscriptions/244fa449-6833-417a-9b8e-be5a66bdf344/resourceGroups/lamsubs-py

AZURE_FUNCTIONAPP_PUBLISH_PROFILE set up according to the docs.

Manual

Install Bicep which is used to compile the ARM template that manages the Azure resources.

# Assumes bc-totorobot-py resource group exists
bicep build ./main.bicep # generates main.json
az login
az deployment group create -f ./main.json -g lamsubs-py
func azure functionapp publish lamsubs-py

Local development

Setup

Install the Azure Functions SDK and Azure CLI, then:

1. python3 -m venv .venv
2. source .venv/bin/activate
3. pip3 install -r requirements.txt

Local dev server

# Set these values appropriately
export MAILCHIMP_API_KEY=""
export MAILCHIMP_LIST_ID=""
func host start

Trigger timer function

curl -i http://localhost:7071/api/getConfirmedSubscribers

Tests

python3 -m pytest

Coverage reports:

python3 -m coverage run -m pytest
python3 -m coverage report --omit '.venv/*'

Environment variables

These are substituted in as part of the deploy process and set in the GitHub repo secrets:

• AZURE_CREDENTIALS discussed above.
• AZURE_FUNCTIONAPP_PUBLISH_PROFILE discussed above.
• MAILCHIMP_API_KEY from Mailchimp settings to be able to connect to the API. MAILCHIMP_LIST_ID from Audience settings.