This repo contains basic examples to highlight helper container design patterns.

The patterns show are:

• Sidecar
• Ambassador

These patterns are shown against simulated applications. The purpose of each 'application' is to retrieve images of dogs from Dog API. The helper patterns are used to monitor the API requests and send a Slack notification upon an error.

flask
requests

axios
winston

Upon encountering an error, an HTTP POST request is made to a Slack Webhook.

Set up an Incoming Webhook using the Slack API Documentation.

Update slack_url / SLACK_URL variables in the code with the Webhook URL from the above documentation. NB: There are placeholder values "<slack_webhook>" which need to be replaced.

There are two main scripts, written in Python and Node.js, which simulate different applications. Run them respectively with:

python main.py
node main.js

Each of these main application contains an enum to simulate the different design patterns. Set the Mode to either STANDALONE, SIDECAR or AMBASSADOR to use that particular pattern.

The helper scripts should be run in another terminal window when using the corresponding mode:

python ambassador.py
or
python sidecar.py [ py.log | js.log ]