Klarna Serverless

Demonstration of Requirements understanding, proposing a solution and implementation by using the latest tools and techniques.

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• Original repository can be found at klarna-serverless@bitbucket
• Bitbucket Pipelines
• Bitbucket Deployments

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What is this repository for?

• This app is built as assignment for Klarna.
• Adds nosetests for unit testing.
• CI/CD Demonstration
• AWS Resources Monitoring and maintenance of multiple versions
• Code quality measures using SonarCloud.io
• Adds different libs/packages to enhance the application quality and performance.
• Version 1.0.0

Problem Statement:

Proposed Solution:

• It is proposed to use Serverless to design a single service containing multiple AWS lambda functions to cover each feature.

Deployment:

• The deployment will be done using Bitbucket-Pipelines

Development Cycle:

• Distributes the whole development into Issues
• Go through the Bitbucket Issues Page

Deliverable Content

• Stage: Dev

  • v1
    • Fibonacci
    • Factorial
    • Ackermann
  • v2
    • Fibonacci
    • Factorial

• Stage: Prod

  • v1
    • Fibonacci
    • Factorial
    • Ackermann
  • v2
    • Fibonacci
    • Factorial

How do you get set up?

How to set up

To set-up the project locally you need to clone this repo, from master or develop branch or some latest TAG

Test App

• Activate Virtual Environment venv/bin/activate
• Install dependencies pip install -r requirements.txt
• Run nosetests -sv --with-xunit --xunit-file=nosetests.xml --with-xcoverage --xcoverage-file=coverage.xml --cover-package=src --cover-branches to see the unit test execution report
• Local lambda invoke sls invoke local -f factorialV1 -p .test_events/factorial.json
• Deploy changes directly from local: sls deploy

Configuration

Pre-reqs

• Python 3.7
• VS Code
• Serverless
• pip
• nosetests
• Bitbicket
• Bitbicket-pipelines

Requirements

• See requirements.txt

Major Libraries and tools included:

• serverless
• venv
• sonar-scanner

Auth

• No auth is used for this version, though we can do it using authorizer on API Gateway level
• Another possible way is to use JWT

Code Quality

• Access the code analysis report: SonarCloud

Distribution

• A git repository
• A postman collection: https://www.postman.com/collections/f05ea1a1669f862add44

Monitoring

• AWS Dashboard is created
• Several widgets are created to show the performance of API's and Lambdas

Contribution guidelines

• Forks are always appreciated

Screenshots