Move heartbeat to lambdas folder

heartbeat/Dockerfile

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+# Docker image for the heartbeat hitting the lambda API.
+
+FROM public.ecr.aws/lambda/python:3.9
+
+ENV PYTHONDONTWRITEBYTECODE 1
+
+# Install the function's dependencies
+COPY heartbeat/requirements_for_heartbeat.txt ${LAMBDA_TASK_ROOT}
+RUN python -m pip install -r requirements_for_heartbeat.txt
+
+# Copy function code
+COPY heartbeat/heartbeat.py ${LAMBDA_TASK_ROOT}
+
+CMD [ "heartbeat.handler" ]

heartbeat/heartbeat.py

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+"""
+Code to keep the lambda API alive.
+"""
+import ast
+import os
+import uuid
+from typing import List
+
+from notifications_python_client.errors import HTTPError
+from notifications_python_client.notifications import NotificationsAPIClient
+
+API_KEY: str = os.getenv("heartbeat_api_key", "")
+# As we can't pass in a list to env var, we pass a str and convert it.
+BASE_URL: List[str] = ast.literal_eval(os.getenv("heartbeat_base_url"))  # type: ignore
+EMAIL_ADDRESS = "success@simulator.amazonses.com"
+TEMPLATE_ID: uuid.UUID = os.getenv("heartbeat_template_id")  # type: ignore
+
+
+def handler(event, context):
+    if not BASE_URL:
+        print("Variable BASE_URL is missing")
+    if not API_KEY:
+        print("Variable API_KEY is missing")
+    if not TEMPLATE_ID:
+        print("Variable TEMPLATE_ID is missing")
+    for base_url in BASE_URL:
+        notifications_client = NotificationsAPIClient(API_KEY, base_url=base_url)
+        try:
+            notifications_client.send_email_notification(email_address=EMAIL_ADDRESS, template_id=TEMPLATE_ID)
+            print("Email has been sent by {}!".format(base_url))
+        except HTTPError as e:
+            print(f"Could not send heartbeat: status={e.status_code}, msg={e.message}")
+            raise

heartbeat/requirements_for_heartbeat.txt

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+# pyup: ignore file
+# This file is autogenerated. Do not edit it manually.
+# Run `make freeze-requirements` to update requirements.txt
+# with package version changes made in requirements-app.txt
+
+notifications-python-client==6.0.2