SNS to Slack is a Serverless Lambda function written in both Node.js and Python for posting tiered SNS messages to Slack.

Architecture:

• Features
  • Choose either Node.js or Python
  • Deployed with the Serverless framework to AWS
  • The Lambda function is triggered by SNS events
  • Read SNS Notifications of any events
  • Post SNS messages to your designated Slack channel
  • Support of ERROR, WARNING and SUCCESS messages and show them in Red, Yellow and Green

Tiered SNS Messages in Slack:

• Follow these steps to configure a webhook in Slack:

  • Navigate to either https://<your-team>.slack.com/apps or https://api.slack.com/incoming-webhooks
  • Select "Incoming WebHooks"
  • Click the "Create your Slack app" button and follow the wizard to complete the creation of your new app.
  • Activate incoming webhooks for your app in the config page
  • Click on "Add New Webhook to Workspace" and choose the default channel where SNS messages should be sent and click "Add Incoming WebHooks Integration".
  • Copy the Webhook URL from the setup instructions and paste it into config file (config.js for Node.js or lambda.cfg for Python)

• Caution:

  • The Lambda function must be set up to be triggered by SNS.
  • Each SNS message's message body must start with ERROR, WARNING or SUCCESS

• Prerequisites:
  • Python 2.x / 3.x or Anaconda Python 2.x / 3.x
  • Python virtual environment (such as virtualenv or conda)
• Install node.js and npm
• Install Docker
• Install Serverless: npm install -g serverless
• Initialize NPM: npm init
• Install Serverless Python Requirements: npm install --save serverless-python-requirements
• $ cd python
• Update lambda.cfg and serverless.yml
• Deploy Lambda:

export AWS_ACCESS_KEY_ID=<YOUR_AWS_ACCESS_KEY_ID>
export AWS_SECRET_ACCESS_KEY=<YOUR_AWS_SECRET_ACCESS_KEY>
serverless deploy

• Follow this guide to package Python in Lambda with Serverless plugins:

• Prerequisites:
  • Install node.js and npm
  • Install Serverless Framework - Follow along step 1-3 of this reference.
• $ cd nodejs
• Update config.js and serverless.yml
• Deploy Lambda:

export AWS_ACCESS_KEY_ID=<YOUR_AWS_ACCESS_KEY_ID>
export AWS_SECRET_ACCESS_KEY=<YOUR_AWS_SECRET_ACCESS_KEY>
serverless deploy

• Follow this guide to package Nodejs in Lambda with Serverless plugins

• Serverless.yml Reference
  • https://serverless.com/framework/docs/providers/aws/guide/serverless.yml/
• How to Handle your Python packaging in Lambda with Serverless plugins
  • https://serverless.com/blog/serverless-python-packaging/
• How to deploy a Node.js application to AWS Lambda using Serverless
  • https://dev.to/adnanrahic/how-to-deploy-a-nodejs-application-to-aws-lambda-using-serverless-2nc7